sql_parse.cc 225 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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#define MYSQL_LEX 1
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#include "mysql_priv.h"
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#include "sql_repl.h"
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#include "repl_failsafe.h"
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#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>

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#ifdef HAVE_INNOBASE_DB
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#include "ha_innodb.h"
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#endif

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#ifdef HAVE_NDBCLUSTER_DB
#include "ha_ndbcluster.h"
#endif

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#include "sp_head.h"
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#include "sp.h"
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#include "sp_cache.h"
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#ifdef HAVE_OPENSSL
/*
  Without SSL the handshake consists of one packet. This packet
  has both client capabilites and scrambled password.
  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
  is in the second packet and client_capabilites field will be ignored.
  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
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#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
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#else
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#define MIN_HANDSHAKE_SIZE      6
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#endif /* HAVE_OPENSSL */
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/* Used in error handling only */
#define SP_TYPE_STRING(LP) \
  ((LP)->sphead->m_type == TYPE_ENUM_FUNCTION ? "FUNCTION" : "PROCEDURE")
#define SP_COM_STRING(LP) \
  ((LP)->sql_command == SQLCOM_CREATE_SPFUNCTION || \
   (LP)->sql_command == SQLCOM_ALTER_FUNCTION || \
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   (LP)->sql_command == SQLCOM_SHOW_CREATE_FUNC || \
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   (LP)->sql_command == SQLCOM_DROP_FUNCTION ? \
   "FUNCTION" : "PROCEDURE")

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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
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static void decrease_user_connections(USER_CONN *uc);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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static bool check_multi_update_lock(THD *thd);
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static void remove_escape(char *name);
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static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name);
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const char *any_db="*any*";	// Special symbol for check_access
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const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
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  "Connect","Kill","Debug","Ping","Time","Delayed insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
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  "Prepare", "Execute", "Long Data", "Close stmt",
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  "Reset stmt", "Set option", "Fetch",
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  "Error"					// Last command number
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};

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const char *xa_state_names[]={
  "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED"
};

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#ifdef __WIN__
static void  test_signal(int sig_ptr)
{
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#if !defined( DBUG_OFF)
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  MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
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#if defined(OS2)
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  fprintf(stderr, "Test signal %d\n", sig_ptr);
  fflush(stderr);
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#endif
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}
static void init_signals(void)
{
  int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
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  for (int i=0 ; i < 7 ; i++)
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    signal( signals[i], test_signal) ;
}
#endif

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static void unlock_locked_tables(THD *thd)
{
  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
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    thd->locked_tables=0;			// Will be automatically closed
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    close_thread_tables(thd);			// Free tables
  }
}

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static bool end_active_trans(THD *thd)
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{
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  int error=0;
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  DBUG_ENTER("end_active_trans");
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  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
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  if (thd->transaction.xid_state.xa_state != XA_NOTR)
  {
    my_error(ER_XAER_RMFAIL, MYF(0),
             xa_state_names[thd->transaction.xid_state.xa_state]);
    DBUG_RETURN(1);
  }
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  if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN |
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		      OPTION_TABLE_LOCK))
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  {
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    DBUG_PRINT("info",("options: 0x%lx", (ulong) thd->options));
    /* Safety if one did "drop table" on locked tables */
    if (!thd->locked_tables)
      thd->options&= ~OPTION_TABLE_LOCK;
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    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_commit(thd))
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      error=1;
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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  }
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  DBUG_RETURN(error);
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}

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static bool begin_trans(THD *thd)
{
  int error=0;
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  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    return 1;
  }
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  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
    thd->locked_tables=0;			// Will be automatically closed
    close_thread_tables(thd);			// Free tables
  }
  if (end_active_trans(thd))
    error= -1;
  else
  {
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    LEX *lex= thd->lex;
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    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
		   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
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      error= ha_start_consistent_snapshot(thd);
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  }
  return error;
}
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#ifdef HAVE_REPLICATION
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/*
  Returns true if all tables should be ignored
*/
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inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
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  return table_rules_on && tables && !tables_ok(thd,tables);
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}
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#endif
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static bool some_non_temp_table_to_be_updated(THD *thd, TABLE_LIST *tables)
{
  for (TABLE_LIST *table= tables; table; table= table->next_global)
  {
    DBUG_ASSERT(table->db && table->table_name);
    if (table->updating &&
        !find_temporary_table(thd, table->db, table->table_name))
      return 1;
  }
  return 0;
}

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static HASH hash_user_connections;

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static int get_or_create_user_conn(THD *thd, const char *user,
				   const char *host,
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				   USER_RESOURCES *mqh)
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{
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  int return_val= 0;
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  uint temp_len, user_len;
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  char temp_user[USER_HOST_BUFF_SIZE];
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  struct  user_conn *uc;

  DBUG_ASSERT(user != 0);
  DBUG_ASSERT(host != 0);

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  user_len= strlen(user);
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  temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (!(uc = (struct  user_conn *) hash_search(&hash_user_connections,
					       (byte*) temp_user, temp_len)))
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  {
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    /* First connection for user; Create a user connection object */
    if (!(uc= ((struct user_conn*)
	       my_malloc(sizeof(struct user_conn) + temp_len+1,
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			 MYF(MY_WME)))))
    {
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      net_send_error(thd, 0, NullS);		// Out of memory
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      return_val= 1;
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      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->host= uc->user + user_len +  1;
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    uc->len= temp_len;
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    uc->connections= uc->questions= uc->updates= uc->conn_per_hour= 0;
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    uc->user_resources= *mqh;
    uc->intime= thd->thr_create_time;
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    if (my_hash_insert(&hash_user_connections, (byte*) uc))
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    {
      my_free((char*) uc,0);
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      net_send_error(thd, 0, NullS);		// Out of memory
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      return_val= 1;
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      goto end;
    }
  }
  thd->user_connect=uc;
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  uc->connections++;
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end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
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}
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#endif /* !NO_EMBEDDED_ACCESS_CHECKS */
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/*
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  Check if user exist and password supplied is correct. 

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  SYNOPSIS
    check_user()
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    thd          thread handle, thd->security_ctx->{host,user,ip} are used
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    command      originator of the check: now check_user is called
                 during connect and change user procedures; used for 
                 logging.
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    passwd       scrambled password received from client
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    passwd_len   length of scrambled password
    db           database name to connect to, may be NULL
    check_count  dont know exactly

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    Note, that host, user and passwd may point to communication buffer.
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    Current implementation does not depend on that, but future changes
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    should be done with this in mind; 'thd' is INOUT, all other params
    are 'IN'.

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  RETURN VALUE
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    0  OK; thd->security_ctx->user/master_access/priv_user/db_access and
       thd->db are updated; OK is sent to client;
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   -1  access denied or handshake error; error is sent to client;
   >0  error, not sent to client
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*/

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int check_user(THD *thd, enum enum_server_command command, 
	       const char *passwd, uint passwd_len, const char *db,
	       bool check_count)
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{
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  DBUG_ENTER("check_user");
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
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  thd->main_security_ctx.master_access= GLOBAL_ACLS;       // Full rights
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  /* Change database if necessary */
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  if (db && db[0])
  {
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    /*
      thd->db is saved in caller and needs to be freed by caller if this
      function returns 0
    */
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    thd->reset_db(NULL, 0);
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    if (mysql_change_db(thd, db, FALSE))
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    {
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      /* Send the error to the client */
      net_send_error(thd);
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      DBUG_RETURN(-1);
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    }
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  }
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  send_ok(thd);
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  DBUG_RETURN(0);
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#else

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  my_bool opt_secure_auth_local;
  pthread_mutex_lock(&LOCK_global_system_variables);
  opt_secure_auth_local= opt_secure_auth;
  pthread_mutex_unlock(&LOCK_global_system_variables);
  
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  /*
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    If the server is running in secure auth mode, short scrambles are 
    forbidden.
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  */
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  if (opt_secure_auth_local && passwd_len == SCRAMBLE_LENGTH_323)
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    mysql_log.write(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  if (passwd_len != 0 &&
      passwd_len != SCRAMBLE_LENGTH &&
      passwd_len != SCRAMBLE_LENGTH_323)
    DBUG_RETURN(ER_HANDSHAKE_ERROR);
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  /*
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    Clear thd->db as it points to something, that will be freed when 
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    connection is closed. We don't want to accidentally free a wrong pointer
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    if connect failed. Also in case of 'CHANGE USER' failure, current
    database will be switched to 'no database selected'.
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  */
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  thd->reset_db(NULL, 0);

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  USER_RESOURCES ur;
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  int res= acl_getroot(thd, &ur, passwd, passwd_len);
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#ifndef EMBEDDED_LIBRARY
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  if (res == -1)
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  {
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    /*
      This happens when client (new) sends password scrambled with
      scramble(), but database holds old value (scrambled with
      scramble_323()). Here we please client to send scrambled_password
      in old format.
    */
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    NET *net= &thd->net;
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    if (opt_secure_auth_local)
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    {
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      net_printf_error(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE,
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                       thd->main_security_ctx.user,
                       thd->main_security_ctx.host_or_ip);
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      mysql_log.write(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
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                      thd->main_security_ctx.user,
                      thd->main_security_ctx.host_or_ip);
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      DBUG_RETURN(-1);
    }
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    /* We have to read very specific packet size */
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    if (send_old_password_request(thd) ||
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        my_net_read(net) != SCRAMBLE_LENGTH_323 + 1)
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    {
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      inc_host_errors(&thd->remote.sin_addr);
      DBUG_RETURN(ER_HANDSHAKE_ERROR);
    }
    /* Final attempt to check the user based on reply */
    /* So as passwd is short, errcode is always >= 0 */
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    res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
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  }
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#endif /*EMBEDDED_LIBRARY*/
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  /* here res is always >= 0 */
  if (res == 0)
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  {
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    if (!(thd->main_security_ctx.master_access &
          NO_ACCESS)) // authentication is OK
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    {
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      DBUG_PRINT("info",
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                 ("Capabilities: %lu  packet_length: %ld  Host: '%s'  "
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                  "Login user: '%s' Priv_user: '%s'  Using password: %s "
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                  "Access: %lu  db: '%s'",
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                  thd->client_capabilities,
                  thd->max_client_packet_length,
                  thd->main_security_ctx.host_or_ip,
                  thd->main_security_ctx.user,
                  thd->main_security_ctx.priv_user,
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                  passwd_len ? "yes": "no",
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                  thd->main_security_ctx.master_access,
                  (thd->db ? thd->db : "*none*")));
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      if (check_count)
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      {
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        VOID(pthread_mutex_lock(&LOCK_thread_count));
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        bool count_ok= thread_count <= max_connections + delayed_insert_threads
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                       || (thd->main_security_ctx.master_access & SUPER_ACL);
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        VOID(pthread_mutex_unlock(&LOCK_thread_count));
        if (!count_ok)
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        {                                         // too many connections
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          net_send_error(thd, ER_CON_COUNT_ERROR);
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          DBUG_RETURN(-1);
        }
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      }
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      /* Why logging is performed before all checks've passed? */
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      mysql_log.write(thd, command,
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                      (thd->main_security_ctx.priv_user ==
                       thd->main_security_ctx.user ?
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                       (char*) "%s@%s on %s" :
                       (char*) "%s@%s as anonymous on %s"),
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                      thd->main_security_ctx.user,
                      thd->main_security_ctx.host_or_ip,
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                      db ? db : (char*) "");

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      /*
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        This is the default access rights for the current database.  It's
        set to 0 here because we don't have an active database yet (and we
        may not have an active database to set.
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      */
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      thd->main_security_ctx.db_access=0;
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      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn ||
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	   max_user_connections) &&
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	  get_or_create_user_conn(thd,
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            (opt_old_style_user_limits ? thd->main_security_ctx.user :
             thd->main_security_ctx.priv_user),
            (opt_old_style_user_limits ? thd->main_security_ctx.host_or_ip :
             thd->main_security_ctx.priv_host),
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            &ur))
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	DBUG_RETURN(-1);
      if (thd->user_connect &&
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	  (thd->user_connect->user_resources.conn_per_hour ||
	   thd->user_connect->user_resources.user_conn ||
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	   max_user_connections) &&
	  check_for_max_user_connections(thd, thd->user_connect))
	DBUG_RETURN(-1);
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      /* Change database if necessary */
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      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db, FALSE))
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        {
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          /* Send error to the client */
          net_send_error(thd);
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          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
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      send_ok(thd);
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      thd->password= test(passwd_len);          // remember for error messages 
      /* Ready to handle queries */
      DBUG_RETURN(0);
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    }
  }
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  else if (res == 2) // client gave short hash, server has long hash
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  net_printf_error(thd, ER_ACCESS_DENIED_ERROR,
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                   thd->main_security_ctx.user,
                   thd->main_security_ctx.host_or_ip,
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                   passwd_len ? ER(ER_YES) : ER(ER_NO));
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  mysql_log.write(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
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                  thd->main_security_ctx.user,
                  thd->main_security_ctx.host_or_ip,
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                  passwd_len ? ER(ER_YES) : ER(ER_NO));
  DBUG_RETURN(-1);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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/*
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  Check for maximum allowable user connections, if the mysqld server is
  started with corresponding variable that is greater then 0.
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*/

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extern "C" byte *get_key_conn(user_conn *buff, uint *length,
			      my_bool not_used __attribute__((unused)))
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{
  *length=buff->len;
  return (byte*) buff->user;
}

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extern "C" void free_user(struct user_conn *uc)
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{
  my_free((char*) uc,MYF(0));
}

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void init_max_user_conn(void)
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{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  (void) hash_init(&hash_user_connections,system_charset_info,max_connections,
		   0,0,
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		   (hash_get_key) get_key_conn, (hash_free_key) free_user,
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		   0);
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#endif
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}


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/*
  check if user has already too many connections
  
  SYNOPSIS
  check_for_max_user_connections()
  thd			Thread handle
  uc			User connect object

  NOTES
    If check fails, we decrease user connection count, which means one
    shouldn't call decrease_user_connections() after this function.

  RETURN
    0	ok
    1	error
*/

523 524
#ifndef NO_EMBEDDED_ACCESS_CHECKS

525
static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
526
{
527
  int error=0;
528
  DBUG_ENTER("check_for_max_user_connections");
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530
  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (max_user_connections && !uc->user_resources.user_conn &&
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      max_user_connections < (uint) uc->connections)
533
  {
534
    net_printf_error(thd, ER_TOO_MANY_USER_CONNECTIONS, uc->user);
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    error=1;
    goto end;
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  }
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  time_out_user_resource_limits(thd, uc);
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  if (uc->user_resources.user_conn &&
      uc->user_resources.user_conn < uc->connections)
  {
    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
                     "max_user_connections",
                     (long) uc->user_resources.user_conn);
    error= 1;
    goto end;
  }
  if (uc->user_resources.conn_per_hour &&
      uc->user_resources.conn_per_hour <= uc->conn_per_hour)
550
  {
551
    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
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                     "max_connections_per_hour",
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                     (long) uc->user_resources.conn_per_hour);
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    error=1;
    goto end;
  }
557
  uc->conn_per_hour++;
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  end:
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  if (error)
    uc->connections--; // no need for decrease_user_connections() here
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
563
  DBUG_RETURN(error);
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}

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/*
  Decrease user connection count

  SYNOPSIS
    decrease_user_connections()
    uc			User connection object

  NOTES
    If there is a n user connection object for a connection
    (which only happens if 'max_user_connections' is defined or
    if someone has created a resource grant for a user), then
    the connection count is always incremented on connect.

    The user connect object is not freed if some users has
    'max connections per hour' defined as we need to be able to hold
    count over the lifetime of the connection.
*/

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static void decrease_user_connections(USER_CONN *uc)
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{
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  DBUG_ENTER("decrease_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
  DBUG_ASSERT(uc->connections);
  if (!--uc->connections && !mqh_used)
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  {
    /* Last connection for user; Delete it */
592
    (void) hash_delete(&hash_user_connections,(byte*) uc);
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  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_VOID_RETURN;
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}

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#endif /* NO_EMBEDDED_ACCESS_CHECKS */

600

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void free_max_user_conn(void)
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  hash_free(&hash_user_connections);
605
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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608

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/*
  Mark all commands that somehow changes a table
  This is used to check number of updates / hour
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  sql_command is actually set to SQLCOM_END sometimes
  so we need the +1 to include it in the array.
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  numbers are:
     0  - read-only query
  != 0  - query that may change a table
     2  - query that returns meaningful ROW_COUNT() -
          a number of modified rows
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*/

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char  uc_update_queries[SQLCOM_END+1];
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void init_update_queries(void)
{
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  bzero((gptr) &uc_update_queries, sizeof(uc_update_queries));

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  uc_update_queries[SQLCOM_CREATE_TABLE]=1;
  uc_update_queries[SQLCOM_CREATE_INDEX]=1;
  uc_update_queries[SQLCOM_ALTER_TABLE]=1;
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  uc_update_queries[SQLCOM_UPDATE]=2;
  uc_update_queries[SQLCOM_UPDATE_MULTI]=2;
  uc_update_queries[SQLCOM_INSERT]=2;
  uc_update_queries[SQLCOM_INSERT_SELECT]=2;
  uc_update_queries[SQLCOM_DELETE]=2;
  uc_update_queries[SQLCOM_DELETE_MULTI]=2;
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  uc_update_queries[SQLCOM_TRUNCATE]=1;
  uc_update_queries[SQLCOM_DROP_TABLE]=1;
  uc_update_queries[SQLCOM_LOAD]=1;
  uc_update_queries[SQLCOM_CREATE_DB]=1;
  uc_update_queries[SQLCOM_DROP_DB]=1;
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  uc_update_queries[SQLCOM_REPLACE]=2;
  uc_update_queries[SQLCOM_REPLACE_SELECT]=2;
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  uc_update_queries[SQLCOM_RENAME_TABLE]=1;
  uc_update_queries[SQLCOM_BACKUP_TABLE]=1;
  uc_update_queries[SQLCOM_RESTORE_TABLE]=1;
  uc_update_queries[SQLCOM_DROP_INDEX]=1;
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  uc_update_queries[SQLCOM_CREATE_VIEW]=1;
  uc_update_queries[SQLCOM_DROP_VIEW]=1;
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}

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bool is_update_query(enum enum_sql_command command)
{
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  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
657
  return uc_update_queries[command] != 0;
658
}
659

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660
/*
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  Reset per-hour user resource limits when it has been more than
  an hour since they were last checked
663

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  SYNOPSIS:
    time_out_user_resource_limits()
    thd			Thread handler
    uc			User connection details
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  NOTE:
    This assumes that the LOCK_user_conn mutex has been acquired, so it is
    safe to test and modify members of the USER_CONN structure.
*/
673

674
static void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
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{
676
  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
677
  DBUG_ENTER("time_out_user_resource_limits");
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678

679
  /* If more than a hour since last check, reset resource checking */
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  if (check_time  - uc->intime >= 3600)
  {
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
  }
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  DBUG_VOID_RETURN;
}


/*
  Check if maximum queries per hour limit has been reached
  returns 0 if OK.
*/

static bool check_mqh(THD *thd, uint check_command)
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  bool error= 0;
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  USER_CONN *uc=thd->user_connect;
  DBUG_ENTER("check_mqh");
  DBUG_ASSERT(uc != 0);

  (void) pthread_mutex_lock(&LOCK_user_conn);

  time_out_user_resource_limits(thd, uc);

709
  /* Check that we have not done too many questions / hour */
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  if (uc->user_resources.questions &&
      uc->questions++ >= uc->user_resources.questions)
  {
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    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
                     (long) uc->user_resources.questions);
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    error=1;
    goto end;
  }
718
  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
    if (uc->user_resources.updates && uc_update_queries[check_command] &&
	uc->updates++ >= uc->user_resources.updates)
    {
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      net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
                       (long) uc->user_resources.updates);
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      error=1;
      goto end;
    }
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  }
end:
731
  (void) pthread_mutex_unlock(&LOCK_user_conn);
732
  DBUG_RETURN(error);
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#else
  return (0);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

738

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static void reset_mqh(LEX_USER *lu, bool get_them= 0)
740
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (lu)  // for GRANT
744
  {
745
    USER_CONN *uc;
746
    uint temp_len=lu->user.length+lu->host.length+2;
747
    char temp_user[USER_HOST_BUFF_SIZE];
748

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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
751
    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
752
    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
753
						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else
762
  {
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    /* for FLUSH PRIVILEGES and FLUSH USER_RESOURCES */
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    for (uint idx=0;idx < hash_user_connections.records; idx++)
765
    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections,
						      idx);
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      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
775
  (void) pthread_mutex_unlock(&LOCK_user_conn);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
777
}
778

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void thd_init_client_charset(THD *thd, uint cs_number)
{
  /*
   Use server character set and collation if
   - opt_character_set_client_handshake is not set
   - client has not specified a character set
   - client character set is the same as the servers
   - client character set doesn't exists in server
  */
  if (!opt_character_set_client_handshake ||
      !(thd->variables.character_set_client= get_charset(cs_number, MYF(0))) ||
      !my_strcasecmp(&my_charset_latin1,
                     global_system_variables.character_set_client->name,
                     thd->variables.character_set_client->name))
  {
    thd->variables.character_set_client=
      global_system_variables.character_set_client;
    thd->variables.collation_connection=
      global_system_variables.collation_connection;
    thd->variables.character_set_results=
      global_system_variables.character_set_results;
  }
  else
  {
    thd->variables.character_set_results=
      thd->variables.collation_connection= 
      thd->variables.character_set_client;
  }
}


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/*
811
    Perform handshake, authorize client and update thd ACL variables.
812
  SYNOPSIS
813
    check_connection()
814
    thd  thread handle
815 816

  RETURN
817
     0  success, OK is sent to user, thd is updated.
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    -1  error, which is sent to user
   > 0  error code (not sent to user)
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*/

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#ifndef EMBEDDED_LIBRARY
static int check_connection(THD *thd)
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{
825
  uint connect_errors= 0;
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  NET *net= &thd->net;
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  ulong pkt_len= 0;
  char *end;
829

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  DBUG_PRINT("info",
             ("New connection received on %s", vio_description(net->vio)));
832
#ifdef SIGNAL_WITH_VIO_CLOSE
833
  thd->set_active_vio(net->vio);
834
#endif
835

836
  if (!thd->main_security_ctx.host)         // If TCP/IP connection
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  {
838
    char ip[30];
839

840
    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
842
    if (!(thd->main_security_ctx.ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
844
    thd->main_security_ctx.host_or_ip= thd->main_security_ctx.ip;
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845
    vio_in_addr(net->vio,&thd->remote.sin_addr);
846
    if (!(specialflag & SPECIAL_NO_RESOLVE))
847
    {
848
      vio_in_addr(net->vio,&thd->remote.sin_addr);
849 850
      thd->main_security_ctx.host=
        ip_to_hostname(&thd->remote.sin_addr, &connect_errors);
851
      /* Cut very long hostnames to avoid possible overflows */
852
      if (thd->main_security_ctx.host)
853
      {
854 855 856 857
        if (thd->main_security_ctx.host != my_localhost)
          thd->main_security_ctx.host[min(strlen(thd->main_security_ctx.host),
                                          HOSTNAME_LENGTH)]= 0;
        thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
858
      }
859 860
      if (connect_errors > max_connect_errors)
        return(ER_HOST_IS_BLOCKED);
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861
    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
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		       (thd->main_security_ctx.host ?
                        thd->main_security_ctx.host : "unknown host"),
		       (thd->main_security_ctx.ip ?
                        thd->main_security_ctx.ip : "unknown ip")));
    if (acl_check_host(thd->main_security_ctx.host, thd->main_security_ctx.ip))
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      return(ER_HOST_NOT_PRIVILEGED);
  }
870
  else /* Hostname given means that the connection was on a socket */
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871
  {
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    DBUG_PRINT("info",("Host: %s", thd->main_security_ctx.host));
    thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
    thd->main_security_ctx.ip= 0;
875 876
    /* Reset sin_addr */
    bzero((char*) &thd->remote, sizeof(thd->remote));
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  }
  vio_keepalive(net->vio, TRUE);
  {
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880
    /* buff[] needs to big enough to hold the server_version variable */
881
    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
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    ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
			  CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
884

885 886 887 888 889
    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
892
      client_flags |= CLIENT_SSL;       /* Wow, SSL is available! */
893
#endif /* HAVE_OPENSSL */
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894

895 896 897 898 899 900 901 902 903 904 905
    end= strnmov(buff, server_version, SERVER_VERSION_LENGTH) + 1;
    int4store((uchar*) end, thd->thread_id);
    end+= 4;
    /*
      So as check_connection is the only entry point to authorization
      procedure, scramble is set here. This gives us new scramble for
      each handshake.
    */
    create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
    /*
      Old clients does not understand long scrambles, but can ignore packet
906
      tail: that's why first part of the scramble is placed here, and second
907 908
      part at the end of packet.
    */
909
    end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
910 911 912
   
    int2store(end, client_flags);
    /* write server characteristics: up to 16 bytes allowed */
913
    end[2]=(char) default_charset_info->number;
914 915 916 917 918 919 920 921 922
    int2store(end+3, thd->server_status);
    bzero(end+5, 13);
    end+= 18;
    /* write scramble tail */
    end= strmake(end, thd->scramble + SCRAMBLE_LENGTH_323, 
                 SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323) + 1;

    /* At this point we write connection message and read reply */
    if (net_write_command(net, (uchar) protocol_version, "", 0, buff,
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923
			  (uint) (end-buff)) ||
924
	(pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < MIN_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
  if (connect_errors)
    reset_host_errors(&thd->remote.sin_addr);
936
  if (thd->packet.alloc(thd->variables.net_buffer_length))
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    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
940 941 942 943
  if (thd->client_capabilities & CLIENT_PROTOCOL_41)
  {
    thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
    thd->max_client_packet_length= uint4korr(net->read_pos+4);
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944
    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
945
    thd_init_client_charset(thd, (uint) net->read_pos[8]);
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946
    thd->update_charset();
947
    end= (char*) net->read_pos+32;
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  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

955
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
956
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
958
  DBUG_PRINT("info", ("client capabilities: %lu", thd->client_capabilities));
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  if (thd->client_capabilities & CLIENT_SSL)
  {
    /* Do the SSL layering. */
962 963 964 965 966
    if (!ssl_acceptor_fd)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
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967
    DBUG_PRINT("info", ("IO layer change in progress..."));
968
    if (sslaccept(ssl_acceptor_fd, net->vio, net->read_timeout))
969
    {
970
      DBUG_PRINT("error", ("Failed to accept new SSL connection"));
971
      inc_host_errors(&thd->remote.sin_addr);
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      return(ER_HANDSHAKE_ERROR);
973
    }
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974
    DBUG_PRINT("info", ("Reading user information over SSL layer"));
975
    if ((pkt_len= my_net_read(net)) == packet_error ||
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976 977
	pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
978 979
      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
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      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
984 985 986
#endif

  if (end >= (char*) net->read_pos+ pkt_len +2)
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  {
988 989
    inc_host_errors(&thd->remote.sin_addr);
    return(ER_HANDSHAKE_ERROR);
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990 991 992
  }

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
993
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
994
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
995 996
      opt_using_transactions)
    net->return_status= &thd->server_status;
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997

998 999
  char *user= end;
  char *passwd= strend(user)+1;
1000
  uint user_len= passwd - user - 1;
1001
  char *db= passwd;
1002 1003
  char db_buff[NAME_LEN + 1];           // buffer to store db in utf8
  char user_buff[USERNAME_LENGTH + 1];	// buffer to store user in utf8
1004 1005 1006
  uint dummy_errors;

  /*
1007 1008 1009 1010
    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
1011
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
1012 1013 1014
    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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1015 1016
  uint db_len= db ? strlen(db) : 0;

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  if (passwd + passwd_len + db_len > (char *)net->read_pos + pkt_len)
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1018 1019 1020 1021
  {
    inc_host_errors(&thd->remote.sin_addr);
    return ER_HANDSHAKE_ERROR;
  }
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1022

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1023 1024
  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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1025
  {
1026 1027
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
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1028
                             db, db_len,
1029
                             thd->charset(), &dummy_errors)]= 0;
1030
    db= db_buff;
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1031
  }
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1032

1033 1034 1035
  user_buff[user_len= copy_and_convert(user_buff, sizeof(user_buff)-1,
                                       system_charset_info, user, user_len,
                                       thd->charset(), &dummy_errors)]= '\0';
1036
  user= user_buff;
1037

1038 1039 1040 1041 1042 1043 1044 1045
  /* If username starts and ends in "'", chop them off */
  if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'')
  {
    user[user_len-1]= 0;
    user++;
    user_len-= 2;
  }

1046 1047 1048
  if (thd->main_security_ctx.user)
    x_free(thd->main_security_ctx.user);
  if (!(thd->main_security_ctx.user= my_strdup(user, MYF(0))))
1049
    return (ER_OUT_OF_RESOURCES);
1050
  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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1051 1052
}

1053

1054 1055
void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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1056 1057 1058 1059
{
  Vio* save_vio;
  ulong save_client_capabilities;

1060 1061 1062 1063 1064 1065 1066 1067 1068
  thd->proc_info= "Execution of init_command";
  /*
    We need to lock init_command_var because
    during execution of init_command_var query
    values of init_command_var can't be changed
  */
  rw_rdlock(var_mutex);
  thd->query= init_command_var->value;
  thd->query_length= init_command_var->value_length;
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1069 1070
  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
1071 1072 1073 1074
  /*
    We don't need return result of execution to client side.
    To forbid this we should set thd->net.vio to 0.
  */
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1075 1076
  save_vio= thd->net.vio;
  thd->net.vio= 0;
1077
  thd->net.no_send_error= 0;
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1078
  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
1079
  rw_unlock(var_mutex);
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1080 1081 1082 1083 1084
  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
}


1085
pthread_handler_t handle_one_connection(void *arg)
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1086 1087 1088
{
  THD *thd=(THD*) arg;
  uint launch_time  =
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1089
    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
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1090 1091 1092 1093 1094
  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

1095
#if !defined( __WIN__) && !defined(OS2)	// Win32 calls this in pthread_create
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1096
  /* The following calls needs to be done before we call DBUG_ macros */
1097
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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1098
  {
1099
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1100
    statistic_increment(aborted_connects,&LOCK_status);
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1101 1102 1103 1104 1105
    end_thread(thd,0);
    return 0;
  }
#endif

1106 1107 1108 1109 1110 1111 1112
  /*
    handle_one_connection() is the only way a thread would start
    and would always be on top of the stack, therefore, the thread
    stack always starts at the address of the first local variable
    of handle_one_connection, which is thd. We need to know the
    start of the stack so that we could check for stack overruns.
  */
1113
  DBUG_PRINT("info", ("handle_one_connection called by thread %lu\n",
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1114
		      thd->thread_id));
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1115
  /* now that we've called my_thread_init(), it is safe to call DBUG_* */
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1116

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1117
#if defined(__WIN__)
1118
  init_signals();
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1119
#elif !defined(OS2) && !defined(__NETWARE__)
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1120 1121 1122 1123
  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
1124
  thd->thread_stack= (char*) &thd;
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1125 1126
  if (thd->store_globals())
  {
1127
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1128
    statistic_increment(aborted_connects,&LOCK_status);
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1129 1130 1131 1132 1133 1134 1135 1136
    end_thread(thd,0);
    return 0;
  }

  do
  {
    int error;
    NET *net= &thd->net;
1137
    Security_context *sctx= thd->security_ctx;
1138
    net->no_send_error= 0;
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1139

1140 1141 1142 1143
    /* Use "connect_timeout" value during connection phase */
    net_set_read_timeout(net, connect_timeout);
    net_set_write_timeout(net, connect_timeout);

1144
    if ((error=check_connection(thd)))
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1145 1146
    {						// Wrong permissions
      if (error > 0)
1147
	net_printf_error(thd, error, sctx->host_or_ip);
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1148 1149
#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
1150
	my_sleep(1000);				/* must wait after eof() */
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1151
#endif
1152
      statistic_increment(aborted_connects,&LOCK_status);
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1153 1154
      goto end_thread;
    }
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1155
#ifdef __NETWARE__
1156
    netware_reg_user(sctx->ip, sctx->user, "MySQL");
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1157
#endif
1158
    if (thd->variables.max_join_size == HA_POS_ERROR)
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1159 1160 1161 1162
      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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1163
    thd->version= refresh_version;
1164
    thd->proc_info= 0;
1165
    thd->command= COM_SLEEP;
1166 1167
    thd->set_time();
    thd->init_for_queries();
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1168

1169
    if (sys_init_connect.value_length && !(sctx->master_access & SUPER_ACL))
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1170
    {
1171 1172
      execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
      if (thd->query_error)
1173
      {
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1174
	thd->killed= THD::KILL_CONNECTION;
1175 1176 1177 1178 1179 1180
        sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
                          sctx->user ? sctx->user : "unauthenticated",
                          sctx->host_or_ip, "init_connect command failed");
        sql_print_warning("%s", net->last_error);
      }
1181 1182 1183
      thd->proc_info=0;
      thd->set_time();
      thd->init_for_queries();
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1184 1185
    }

1186 1187 1188 1189
    /* Connect completed, set read/write timeouts back to tdefault */
    net_set_read_timeout(net, thd->variables.net_read_timeout);
    net_set_write_timeout(net, thd->variables.net_write_timeout);

1190 1191
    while (!net->error && net->vio != 0 &&
           !(thd->killed == THD::KILL_CONNECTION))
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1192
    {
1193
      net->no_send_error= 0;
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1194 1195 1196
      if (do_command(thd))
	break;
    }
1197 1198
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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1199
    if (net->error && net->vio != 0 && net->report_error)
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1200
    {
1201
      if (!thd->killed && thd->variables.log_warnings > 1)
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1202
	sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
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1203
                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
1204 1205
                          sctx->user ? sctx->user : "unauthenticated",
                          sctx->host_or_ip,
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1206 1207
                          (net->last_errno ? ER(net->last_errno) :
                           ER(ER_UNKNOWN_ERROR)));
1208
      net_send_error(thd, net->last_errno, NullS);
1209
      statistic_increment(aborted_threads,&LOCK_status);
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1210
    }
1211 1212 1213 1214
    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
1215
    
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1216
end_thread:
1217
    close_connection(thd, 0, 1);
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1218 1219 1220 1221 1222 1223
    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
1224
    thd->thread_stack= (char*) &thd;
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1225 1226 1227 1228 1229
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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1230 1231
#endif /* EMBEDDED_LIBRARY */

1232 1233 1234 1235
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1236

1237
pthread_handler_t handle_bootstrap(void *arg)
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1238
{
1239 1240 1241
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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1242

1243
  /* The following must be called before DBUG_ENTER */
1244
  thd->thread_stack= (char*) &thd;
1245
  if (my_thread_init() || thd->store_globals())
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1246
  {
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1247
#ifndef EMBEDDED_LIBRARY
1248
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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1249
#endif
1250
    thd->fatal_error();
1251
    goto end;
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1252
  }
1253 1254
  DBUG_ENTER("handle_bootstrap");

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1255
#ifndef EMBEDDED_LIBRARY
1256 1257
  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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1258
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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1259
  sigset_t set;
1260 1261
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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1262
#endif
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1263
#endif /* EMBEDDED_LIBRARY */
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1264

1265
  if (thd->variables.max_join_size == HA_POS_ERROR)
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1266 1267 1268 1269
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
1270 1271
  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
1272 1273 1274 1275 1276 1277
  /*
    Make the "client" handle multiple results. This is necessary
    to enable stored procedures with SELECTs and Dynamic SQL
    in init-file.
  */
  thd->client_capabilities|= CLIENT_MULTI_RESULTS;
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1278

1279
  buff= (char*) thd->net.buff;
1280
  thd->init_for_queries();
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1281 1282
  while (fgets(buff, thd->net.max_packet, file))
  {
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1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
   ulong length= (ulong) strlen(buff);
   while (buff[length-1] != '\n' && !feof(file))
   {
     /*
       We got only a part of the current string. Will try to increase
       net buffer then read the rest of the current string.
     */
     if (net_realloc(&(thd->net), 2 * thd->net.max_packet))
     {
       net_send_error(thd, ER_NET_PACKET_TOO_LARGE, NullS);
       thd->fatal_error();
       break;
     }
     buff= (char*) thd->net.buff;
     fgets(buff + length, thd->net.max_packet - length, file);
     length+= (ulong) strlen(buff + length);
   }
   if (thd->is_fatal_error)
     break;

1303
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
1304
           buff[length-1] == ';'))
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1305 1306
      length--;
    buff[length]=0;
1307
    thd->query_length=length;
1308 1309
    thd->query= thd->memdup_w_gap(buff, length+1, 
				  thd->db_length+1+QUERY_CACHE_FLAGS_SIZE);
1310
    thd->query[length] = '\0';
1311
    DBUG_PRINT("query",("%-.4096s",thd->query));
1312 1313 1314 1315
    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
1316
    thd->query_id=next_query_id();
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1317 1318
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1319

1320
    if (thd->is_fatal_error)
1321
      break;
1322 1323 1324 1325 1326 1327 1328 1329 1330

    if (thd->net.report_error)
    {
      /* The query failed, send error to log and abort bootstrap */
      net_send_error(thd);
      thd->fatal_error();
      break;
    }

1331
    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1332
#ifdef USING_TRANSACTIONS
1333
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
1334
#endif
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1335
  }
1336 1337

end:
1338
  /* Remember the exit code of bootstrap */
1339 1340 1341 1342 1343 1344
  bootstrap_error= thd->is_fatal_error;

  net_end(&thd->net);
  thd->cleanup();
  delete thd;

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1345
#ifndef EMBEDDED_LIBRARY
1346 1347 1348
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1349
  (void) pthread_cond_broadcast(&COND_thread_count);
1350 1351
  my_thread_end();
  pthread_exit(0);
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1352
#endif
1353
  DBUG_RETURN(0);
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1354 1355 1356
}


1357 1358 1359 1360
    /* This works because items are allocated with sql_alloc() */

void cleanup_items(Item *item)
{
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1361
  DBUG_ENTER("cleanup_items");  
1362 1363
  for (; item ; item=item->next)
    item->cleanup();
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1364
  DBUG_VOID_RETURN;
1365 1366
}

1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
/*
  Handle COM_TABLE_DUMP command

  SYNOPSIS
    mysql_table_dump
      thd           thread handle
      db            database name or an empty string. If empty,
                    the current database of the connection is used
      tbl_name      name of the table to dump

  NOTES
    This function is written to handle one specific command only.

  RETURN VALUE
    0               success
    1               error, the error message is set in THD
*/

static
int mysql_table_dump(THD* thd, char* db, char* tbl_name)
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1387 1388 1389 1390 1391 1392
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
1393
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1394
    DBUG_RETURN(1); // out of memory
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VIEW  
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1395
  table_list->db= db;
1396
  table_list->table_name= table_list->alias= tbl_name;
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  table_list->lock_type= TL_READ_NO_INSERT;
  table_list->prev_global= &table_list;	// can be removed after merge with 4.1
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1399

1400 1401
  if (!db || check_db_name(db))
  {
1402
    my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL");
1403 1404
    goto err;
  }
1405
  if (lower_case_table_names)
1406
    my_casedn_str(files_charset_info, tbl_name);
1407
  remove_escape(table_list->table_name);
1408 1409 1410 1411

  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

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1412
  if (check_one_table_access(thd, SELECT_ACL, table_list))
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1413 1414
    goto err;
  thd->free_list = 0;
1415
  thd->query_length=(uint) strlen(tbl_name);
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1416
  thd->query = tbl_name;
1417
  if ((error = mysqld_dump_create_info(thd, table_list, -1)))
1418
  {
1419
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1420 1421
    goto err;
  }
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1422
  net_flush(&thd->net);
1423
  if ((error= table->file->dump(thd,-1)))
1424
    my_error(ER_GET_ERRNO, MYF(0), error);
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1425

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1426
err:
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1427
  DBUG_RETURN(error);
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1428 1429
}

1430 1431 1432 1433
/*
  Ends the current transaction and (maybe) begin the next

  SYNOPSIS
1434
    end_trans()
1435 1436 1437 1438 1439 1440 1441
      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

1442
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
1443 1444 1445
{
  bool do_release= 0;
  int res= 0;
1446
  DBUG_ENTER("end_trans");
1447

1448
  if (unlikely(thd->in_sub_stmt))
1449 1450 1451 1452
  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
1453 1454 1455 1456 1457 1458
  if (thd->transaction.xid_state.xa_state != XA_NOTR)
  {
    my_error(ER_XAER_RMFAIL, MYF(0),
             xa_state_names[thd->transaction.xid_state.xa_state]);
    DBUG_RETURN(1);
  }
1459 1460 1461 1462 1463 1464 1465 1466
  switch (completion) {
  case COMMIT:
    /*
     We don't use end_active_trans() here to ensure that this works
     even if there is a problem with the OPTION_AUTO_COMMIT flag
     (Which of course should never happen...)
    */
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
1467
    res= ha_commit(thd);
1468
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
1469 1470
    break;
  case COMMIT_RELEASE:
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1471
    do_release= 1; /* fall through */
1472 1473 1474 1475 1476 1477
  case COMMIT_AND_CHAIN:
    res= end_active_trans(thd);
    if (!res && completion == COMMIT_AND_CHAIN)
      res= begin_trans(thd);
    break;
  case ROLLBACK_RELEASE:
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1478
    do_release= 1; /* fall through */
1479 1480 1481 1482
  case ROLLBACK:
  case ROLLBACK_AND_CHAIN:
  {
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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1483
    if (ha_rollback(thd))
1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494
      res= -1;
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    if (!res && (completion == ROLLBACK_AND_CHAIN))
      res= begin_trans(thd);
    break;
  }
  default:
    res= -1;
    my_error(ER_UNKNOWN_COM_ERROR, MYF(0));
    DBUG_RETURN(-1);
  }
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1495

1496 1497 1498
  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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1499 1500
    thd->killed= THD::KILL_CONNECTION;

1501 1502
  DBUG_RETURN(res);
}
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1503

1504
#ifndef EMBEDDED_LIBRARY
1505 1506

/*
1507
  Read one command from connection and execute it (query or simple command).
1508 1509 1510 1511 1512 1513 1514 1515
  This function is called in loop from thread function.
  SYNOPSIS
    do_command()
  RETURN VALUE
    0  success
    1  request of thread shutdown (see dispatch_command() description)
*/

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1516 1517
bool do_command(THD *thd)
{
1518
  char *packet= 0;
1519
  ulong packet_length;
1520
  NET *net= &thd->net;
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1521 1522 1523
  enum enum_server_command command;
  DBUG_ENTER("do_command");

1524 1525 1526 1527
  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
1528
  thd->lex->current_select= 0;
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1529

1530 1531 1532 1533 1534 1535 1536 1537
  /*
    This thread will do a blocking read from the client which
    will be interrupted when the next command is received from
    the client, the connection is closed or "net_wait_timeout"
    number of seconds has passed
  */
  net_set_read_timeout(net, thd->variables.net_wait_timeout);

1538
  thd->clear_error();				// Clear error message
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1539 1540 1541 1542

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1543 1544 1545 1546 1547
    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
1548 1549
    {
      statistic_increment(aborted_threads,&LOCK_status);
1550
      DBUG_RETURN(TRUE);			// We have to close it.
1551
    }
1552
    net_send_error(thd, net->last_errno, NullS);
1553
    net->error= 0;
1554
    DBUG_RETURN(FALSE);
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1555 1556 1557 1558 1559
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1560 1561
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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1562 1563 1564
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1565
  }
1566 1567 1568 1569

  /* Restore read timeout value */
  net_set_read_timeout(net, thd->variables.net_read_timeout);

1570 1571 1572 1573 1574 1575 1576 1577 1578
  /*
    packet_length contains length of data, as it was stored in packet
    header. In case of malformed header, packet_length can be zero.
    If packet_length is not zero, my_net_read ensures that this number
    of bytes was actually read from network. Additionally my_net_read
    sets packet[packet_length]= 0 (thus if packet_length == 0,
    command == packet[0] == COM_SLEEP).
    In dispatch_command packet[packet_length] points beyond the end of packet.
  */
1579
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1580
}
1581
#endif  /* EMBEDDED_LIBRARY */
1582

1583

1584 1585
/*
   Perform one connection-level (COM_XXXX) command.
1586

1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
  SYNOPSIS
    dispatch_command()
    thd             connection handle
    command         type of command to perform 
    packet          data for the command, packet is always null-terminated
    packet_length   length of packet + 1 (to show that data is
                    null-terminated) except for COM_SLEEP, where it
                    can be zero.
  RETURN VALUE
    0   ok
    1   request of thread shutdown, i. e. if command is
        COM_QUIT/COM_SHUTDOWN
*/
1600

1601 1602 1603 1604
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1605
  bool error= 0;
1606 1607
  DBUG_ENTER("dispatch_command");

1608 1609 1610
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
    thd->killed= THD::NOT_KILLED;

1611
  thd->command=command;
1612
  /*
1613 1614
    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
1615
  */
1616
  thd->enable_slow_log= TRUE;
1617
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
1618
  thd->set_time();
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1619 1620 1621
  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
1622
    next_query_id();
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1623
  thread_running++;
1624
  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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1625
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
1626

1627 1628
  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
1629
  switch (command) {
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1630
  case COM_INIT_DB:
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1631 1632
  {
    LEX_STRING tmp;
1633 1634
    statistic_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB],
			&LOCK_status);
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1635 1636
    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
1637 1638
    if (!mysql_change_db(thd, tmp.str, FALSE))
    {
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1639
      mysql_log.write(thd,command,"%s",thd->db);
1640 1641
      send_ok(thd);
    }
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1642 1643
    break;
  }
1644
#ifdef HAVE_REPLICATION
1645 1646
  case COM_REGISTER_SLAVE:
  {
1647
    if (!register_slave(thd, (uchar*)packet, packet_length))
1648
      send_ok(thd);
1649 1650
    break;
  }
1651
#endif
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1652
  case COM_TABLE_DUMP:
1653 1654 1655
  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
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1656
    if (db_len >= packet_length || db_len > NAME_LEN)
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1657
    {
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1658
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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1659 1660
      break;
    }
1661
    uint tbl_len= *(uchar*) (packet + db_len + 1);
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1662 1663
    if (db_len+tbl_len+2 > packet_length || tbl_len > NAME_LEN)
    {
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1664
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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1665 1666
      break;
    }
1667

1668
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1669
    thd->enable_slow_log= opt_log_slow_admin_statements;
1670
    db= thd->alloc(db_len + tbl_len + 2);
1671 1672 1673 1674 1675
    if (!db)
    {
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
      break;
    }
1676 1677
    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
1678
    mysql_table_dump(thd, db, tbl_name);
1679 1680
    break;
  }
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1681 1682
  case COM_CHANGE_USER:
  {
1683
    thd->change_user();
1684
    thd->clear_error();                         // if errors from rollback
1685

1686
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1687
    char *user= (char*) packet;
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1688
    char *passwd= strend(user)+1;
1689
    /*
1690 1691 1692 1693
      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
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1694
    char db_buff[NAME_LEN+1];               // buffer to store db in utf8
1695
    char *db= passwd;
1696
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
1697 1698
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
1699
#ifndef EMBEDDED_LIBRARY
1700
    /* Small check for incoming packet */
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1701
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1702
    {
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1703
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1704 1705
      break;
    }
1706
#endif
1707
    /* Convert database name to utf8 */
1708
    uint dummy_errors;
1709 1710
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
1711
                             thd->charset(), &dummy_errors)]= 0;
1712
    db= db_buff;
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1713

1714 1715 1716
    /* Save user and privileges */
    uint save_db_length= thd->db_length;
    char *save_db= thd->db;
1717
    Security_context save_security_ctx= *thd->security_ctx;
1718
    USER_CONN *save_user_connect= thd->user_connect;
1719 1720

    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
1721
    {
1722
      thd->security_ctx->user= save_security_ctx.user;
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1723
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
1724 1725
      break;
    }
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1726

1727 1728
    /* Clear variables that are allocated */
    thd->user_connect= 0;
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1729
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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1730

1731 1732
    if (res)
    {
1733
      /* authentication failure, we shall restore old user */
1734
      if (res > 0)
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1735
        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1736 1737
      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
1738
      thd->user_connect= save_user_connect;
1739 1740 1741 1742 1743
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
1744
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1745
      /* we've authenticated new user */
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1746 1747
      if (save_user_connect)
	decrease_user_connections(save_user_connect);
1748
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
1749
      x_free((gptr) save_db);
1750
      x_free((gptr)  save_security_ctx.user);
1751
    }
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1752 1753
    break;
  }
1754
  case COM_STMT_EXECUTE:
1755
  {
1756
    mysql_stmt_execute(thd, packet, packet_length);
1757 1758
    break;
  }
1759
  case COM_STMT_FETCH:
1760 1761 1762 1763
  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
1764
  case COM_STMT_SEND_LONG_DATA:
1765
  {
1766
    mysql_stmt_get_longdata(thd, packet, packet_length);
1767 1768
    break;
  }
1769
  case COM_STMT_PREPARE:
1770
  {
1771
    mysql_stmt_prepare(thd, packet, packet_length);
1772 1773
    break;
  }
1774
  case COM_STMT_CLOSE:
1775
  {
1776
    mysql_stmt_close(thd, packet);
1777 1778
    break;
  }
1779
  case COM_STMT_RESET:
1780 1781 1782 1783
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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1784 1785
  case COM_QUERY:
  {
1786 1787
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1788
    char *packet_end= thd->query + thd->query_length;
1789 1790 1791
    /* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */
    const char *format= "%.*b";
    mysql_log.write(thd,command, format, thd->query_length, thd->query);
1792
    DBUG_PRINT("query",("%-.4096s",thd->query));
1793 1794 1795 1796

    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),QUERY_PRIOR);

1797
    mysql_parse(thd,thd->query, thd->query_length);
1798

1799
    while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error)
1800
    {
1801
      char *packet= thd->lex->found_semicolon;
1802
      net->no_send_error= 0;
1803
      /*
1804 1805
        Multiple queries exits, execute them individually
      */
1806 1807
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
1808
        close_thread_tables(thd);
1809
      ulong length= (ulong)(packet_end-packet);
1810

1811
      log_slow_statement(thd);
1812

1813
      /* Remove garbage at start of query */
1814
      while (my_isspace(thd->charset(), *packet) && length > 0)
1815 1816 1817 1818
      {
        packet++;
        length--;
      }
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1819
      VOID(pthread_mutex_lock(&LOCK_thread_count));
1820
      thd->query_length= length;
1821
      thd->query= packet;
1822
      thd->query_id= next_query_id();
1823
      thd->set_time(); /* Reset the query start time. */
1824
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1825
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1826 1827 1828
      mysql_parse(thd, packet, length);
    }

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1829 1830 1831 1832 1833
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1834
  case COM_FIELD_LIST:				// This isn't actually needed
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1835
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1836 1837
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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1838 1839 1840
    break;
#else
  {
1841
    char *fields, *pend;
1842 1843
    /* Locked closure of all tables */
    TABLE_LIST *locked_tables= NULL;
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1844
    TABLE_LIST table_list;
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1845
    LEX_STRING conv_name;
1846
    /* Saved variable value */
1847 1848
    my_bool old_innodb_table_locks= 
              IF_INNOBASE_DB(thd->variables.innodb_table_locks, FALSE);
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1849 1850
    /* used as fields initializator */
    lex_start(thd, 0, 0);
1851

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1852

1853 1854
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
			&LOCK_status);
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1855
    bzero((char*) &table_list,sizeof(table_list));
1856
    if (thd->copy_db_to(&table_list.db, 0))
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1857
      break;
1858
    pend= strend(packet);
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1859 1860
    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
1861
    table_list.alias= table_list.table_name= conv_name.str;
1862
    packet= pend+1;
1863 1864 1865 1866 1867 1868 1869 1870 1871

    if (!my_strcasecmp(system_charset_info, table_list.db,
                       information_schema_name.str))
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

1872
    thd->query_length= strlen(packet);       // for simplicity: don't optimize
1873 1874
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1875
    mysql_log.write(thd,command,"%s %s",table_list.table_name, fields);
1876
    if (lower_case_table_names)
1877 1878
      my_casedn_str(files_charset_info, table_list.table_name);
    remove_escape(table_list.table_name);	// This can't have wildcards
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1879

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1880
    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
1881
		     0, 0, test(table_list.schema_table)))
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1882
      break;
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1883 1884
    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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1885
      break;
1886 1887 1888 1889 1890 1891
    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
    mysql_init_query(thd, (uchar*)"", 0);
    thd->lex->
      select_lex.table_list.link_in_list((byte*) &table_list,
                                         (byte**) &table_list.next_local);
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1892
    thd->lex->add_to_query_tables(&table_list);
1893

1894 1895
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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1896
    mysqld_list_fields(thd,&table_list,fields);
1897
    thd->lex->unit.cleanup();
1898
    thd->cleanup_after_query();
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1899 1900 1901 1902
    break;
  }
#endif
  case COM_QUIT:
1903
    /* We don't calculate statistics for this command */
1904
    mysql_log.write(thd,command,NullS);
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1905 1906 1907 1908
    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1909
  case COM_CREATE_DB:				// QQ: To be removed
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1910
    {
1911
      char *db=thd->strdup(packet), *alias;
1912
      HA_CREATE_INFO create_info;
1913

1914 1915
      statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
			  &LOCK_status);
1916
      // null test to handle EOM
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1917
      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1918
      {
1919
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1920 1921
	break;
      }
1922
      if (check_access(thd,CREATE_ACL,db,0,1,0,is_schema_db(db)))
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1923
	break;
1924
      mysql_log.write(thd,command,packet);
1925
      bzero(&create_info, sizeof(create_info));
1926 1927
      mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
                      &create_info, 0);
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1928 1929
      break;
    }
1930
  case COM_DROP_DB:				// QQ: To be removed
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1931
    {
1932 1933
      statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
			  &LOCK_status);
1934
      char *db=thd->strdup(packet);
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1935
      /*  null test to handle EOM */
1936
      if (!db || check_db_name(db))
1937
      {
1938
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1939 1940
	break;
      }
1941
      if (check_access(thd,DROP_ACL,db,0,1,0,is_schema_db(db)))
1942
	break;
1943 1944
      if (thd->locked_tables || thd->active_transaction())
      {
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1945 1946
	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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1947
	break;
1948
      }
1949
      mysql_log.write(thd,command,db);
1950
      mysql_rm_db(thd, db, 0, 0);
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1951 1952
      break;
    }
1953
#ifndef EMBEDDED_LIBRARY
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1954 1955
  case COM_BINLOG_DUMP:
    {
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1956 1957 1958 1959
      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1960
      statistic_increment(thd->status_var.com_other,&LOCK_status);
1961
      thd->enable_slow_log= opt_log_slow_admin_statements;
1962
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1963
	break;
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1964

1965
      /* TODO: The following has to be changed to an 8 byte integer */
1966 1967
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1968
      thd->server_id=0; /* avoid suicide */
1969
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1970
	kill_zombie_dump_threads(slave_server_id);
1971
      thd->server_id = slave_server_id;
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1972 1973 1974

      mysql_log.write(thd, command, "Log: '%s'  Pos: %ld", packet+10,
                      (long) pos);
1975
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1976
      unregister_slave(thd,1,1);
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1977
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
1978 1979
      error = TRUE;
      net->error = 0;
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1980 1981
      break;
    }
1982
#endif
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1983
  case COM_REFRESH:
1984 1985 1986 1987 1988 1989
  {
    bool not_used;
    statistic_increment(thd->status_var.com_stat[SQLCOM_FLUSH],
                        &LOCK_status);
    ulong options= (ulong) (uchar) packet[0];
    if (check_global_access(thd,RELOAD_ACL))
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1990
      break;
1991 1992 1993 1994 1995
    mysql_log.write(thd,command,NullS);
    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      send_ok(thd);
    break;
  }
1996
#ifndef EMBEDDED_LIBRARY
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1997
  case COM_SHUTDOWN:
1998
  {
1999
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2000
    if (check_global_access(thd,SHUTDOWN_ACL))
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2001
      break; /* purecov: inspected */
2002
    /*
2003 2004 2005 2006
      If the client is < 4.1.3, it is going to send us no argument; then
      packet_length is 1, packet[0] is the end 0 of the packet. Note that
      SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
      packet[0].
2007
    */
2008 2009
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
2010
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
2011 2012 2013 2014 2015 2016 2017
    if (level == SHUTDOWN_DEFAULT)
      level= SHUTDOWN_WAIT_ALL_BUFFERS; // soon default will be configurable
    else if (level != SHUTDOWN_WAIT_ALL_BUFFERS)
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "this shutdown level");
      break;
    }
2018
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
2019
    mysql_log.write(thd,command,NullS);
2020
    send_eof(thd);
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2021 2022 2023
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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2024
#ifndef OS2
2025
    send_eof(thd);				// This is for 'quit request'
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2026
#endif
2027
    close_connection(thd, 0, 1);
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2028 2029 2030 2031
    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
2032
  }
2033
#endif
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2034 2035
  case COM_STATISTICS:
  {
2036
    mysql_log.write(thd,command,NullS);
2037 2038
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS],
			&LOCK_status);
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2039
#ifndef EMBEDDED_LIBRARY
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2040
    char buff[200];
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2041 2042 2043
#else
    char *buff= thd->net.last_error;
#endif
2044 2045 2046 2047

    STATUS_VAR current_global_status_var;
    calc_sum_of_all_status(&current_global_status_var);

2048
    ulong uptime = (ulong) (thd->start_time - start_time);
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2049
    sprintf((char*) buff,
2050
	    "Uptime: %lu  Threads: %d  Questions: %lu  Slow queries: %lu  Opens: %lu  Flush tables: %lu  Open tables: %u  Queries per second avg: %.3f",
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2051
	    uptime,
2052
	    (int) thread_count, (ulong) thd->query_id,
2053 2054
	    current_global_status_var.long_query_count,
	    current_global_status_var.opened_tables, refresh_version, cached_tables(),
2055 2056
	    (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) :
	     (double) 0));
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2057
#ifdef SAFEMALLOC
2058
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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2059
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
2060 2061
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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2062 2063
#endif
#ifndef EMBEDDED_LIBRARY
2064
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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2065
    VOID(net_flush(net));
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2066
#endif
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2067 2068 2069
    break;
  }
  case COM_PING:
2070
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2071
    send_ok(thd);				// Tell client we are alive
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2072 2073
    break;
  case COM_PROCESS_INFO:
2074 2075
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
			&LOCK_status);
2076 2077
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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2078
      break;
2079
    mysql_log.write(thd,command,NullS);
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2080
    mysqld_list_processes(thd,
2081 2082
			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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2083 2084 2085
    break;
  case COM_PROCESS_KILL:
  {
2086
    statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
2087
    ulong id=(ulong) uint4korr(packet);
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SCRUM  
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2088
    kill_one_thread(thd,id,false);
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2089 2090
    break;
  }
2091 2092
  case COM_SET_OPTION:
  {
2093 2094
    statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
			&LOCK_status);
2095 2096 2097 2098
    enum_mysql_set_option command= (enum_mysql_set_option) uint2korr(packet);
    switch (command) {
    case MYSQL_OPTION_MULTI_STATEMENTS_ON:
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
2099
      send_eof(thd);
2100 2101 2102
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
2103
      send_eof(thd);
2104 2105
      break;
    default:
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2106
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
2107 2108 2109 2110
      break;
    }
    break;
  }
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2111
  case COM_DEBUG:
2112
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2113
    if (check_global_access(thd, SUPER_ACL))
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2114
      break;					/* purecov: inspected */
2115
    mysql_print_status();
2116
    mysql_log.write(thd,command,NullS);
2117
    send_eof(thd);
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2118 2119 2120 2121 2122
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
2123
  case COM_END:
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2124
  default:
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2125
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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2126 2127
    break;
  }
2128 2129
  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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2130 2131 2132 2133
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
  /*
    assume handlers auto-commit (if some doesn't - transaction handling
    in MySQL should be redesigned to support it; it's a big change,
    and it's not worth it - better to commit explicitly only writing
    transactions, read-only ones should better take care of themselves.
    saves some work in 2pc too)
    see also sql_base.cc - close_thread_tables()
  */
  bzero(&thd->transaction.stmt, sizeof(thd->transaction.stmt));
  if (!thd->active_transaction())
2144
    thd->transaction.xid_state.xid.null();
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2145

2146 2147 2148
  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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2149
  if (thd->net.report_error)
2150
    net_send_error(thd);
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2151

2152
  log_slow_statement(thd);
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167

  thd->proc_info="cleaning up";
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
  thd->query_length=0;
  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
  DBUG_RETURN(error);
}


2168
void log_slow_statement(THD *thd)
2169
{
2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180
  time_t start_of_query;

  /*
    The following should never be true with our current code base,
    but better to keep this here so we don't accidently try to log a
    statement in a trigger or stored function
  */
  if (unlikely(thd->in_sub_stmt))
    return;                                     // Don't set time for sub stmt

  start_of_query= thd->start_time;
2181
  thd->end_time();				// Set start time
2182

2183 2184 2185 2186 2187
  /*
    Do not log administrative statements unless the appropriate option is
    set; do not log into slow log if reading from backup.
  */
  if (thd->enable_slow_log && !thd->user_time)
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2188
  {
2189 2190
    thd->proc_info="logging slow query";

2191 2192
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
2193
        (thd->server_status &
2194
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
2195 2196 2197
        (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES) &&
        /* == SQLCOM_END unless this is a SHOW command */
        thd->lex->orig_sql_command == SQLCOM_END)
2198
    {
2199
      thd->status_var.long_query_count++;
2200 2201
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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2202 2203 2204
  }
}

2205

2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233
/*
  Create a TABLE_LIST object for an INFORMATION_SCHEMA table.

  SYNOPSIS
    prepare_schema_table()
      thd              thread handle
      lex              current lex
      table_ident      table alias if it's used
      schema_table_idx the type of the INFORMATION_SCHEMA table to be
                       created

  DESCRIPTION
    This function is used in the parser to convert a SHOW or DESCRIBE
    table_name command to a SELECT from INFORMATION_SCHEMA.
    It prepares a SELECT_LEX and a TABLE_LIST object to represent the
    given command as a SELECT parse tree.

  NOTES
    Due to the way this function works with memory and LEX it cannot
    be used outside the parser (parse tree transformations outside
    the parser break PS and SP).

  RETURN VALUE
    0                 success
    1                 out of memory or SHOW commands are not allowed
                      in this version of the server.
*/

2234 2235 2236 2237 2238
int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
  DBUG_ENTER("prepare_schema_table");
  SELECT_LEX *sel= 0;
2239
  switch (schema_table_idx) {
2240 2241
  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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2242 2243
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
2244 2245 2246 2247 2248 2249 2250 2251 2252 2253
    DBUG_RETURN(1);
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
	check_global_access(thd, SHOW_DB_ACL))
      DBUG_RETURN(1);
    break;
#endif
  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
2254
  case SCH_TRIGGERS:
2255
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2256 2257
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2258 2259 2260
    DBUG_RETURN(1);
#else
    {
2261 2262 2263
      char *db;
      if (lex->select_lex.db == NULL &&
          thd->copy_db_to(&lex->select_lex.db, 0))
2264
      {
2265
        DBUG_RETURN(1);
2266
      }
2267
      db= lex->select_lex.db;
2268 2269 2270
      remove_escape(db);				// Fix escaped '_'
      if (check_db_name(db))
      {
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2271
        my_error(ER_WRONG_DB_NAME, MYF(0), db);
2272 2273
        DBUG_RETURN(1);
      }
2274 2275
      if (check_access(thd, SELECT_ACL, db, &thd->col_access, 0, 0,
                       is_schema_db(db)))
2276 2277 2278
        DBUG_RETURN(1);			        /* purecov: inspected */
      if (!thd->col_access && check_grant_db(thd,db))
      {
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2279
	my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
2280 2281
                 thd->security_ctx->priv_user, thd->security_ctx->priv_host,
                 db);
2282 2283 2284 2285 2286 2287 2288 2289
	DBUG_RETURN(1);
      }
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2290 2291
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2292 2293 2294 2295 2296 2297
    DBUG_RETURN(1);
#else
    if (table_ident)
    {
      TABLE_LIST **query_tables_last= lex->query_tables_last;
      sel= new SELECT_LEX();
2298 2299
      /* 'parent_lex' is used in init_query() so it must be before it. */
      sel->parent_lex= lex;
2300
      sel->init_query();
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monty@mishka.local committed
2301
      if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, 
2302 2303 2304 2305 2306 2307
                                 (List<String> *) 0, (List<String> *) 0))
        DBUG_RETURN(1);
      lex->query_tables_last= query_tables_last;
      TABLE_LIST *table_list= (TABLE_LIST*) sel->table_list.first;
      char *db= table_list->db;
      remove_escape(db);			// Fix escaped '_'
2308
      remove_escape(table_list->table_name);
2309
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
2310 2311
                       &table_list->grant.privilege, 0, 0,
                       test(table_list->schema_table)))
2312 2313 2314 2315 2316 2317 2318
        DBUG_RETURN(1);				/* purecov: inspected */
      if (grant_option && check_grant(thd, SELECT_ACL, table_list, 2,
                                      UINT_MAX, 0))
        DBUG_RETURN(1);
      break;
    }
#endif
2319 2320 2321
  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
  case SCH_PROCEDURES:
  case SCH_CHARSETS:
  case SCH_COLLATIONS:
  case SCH_COLLATION_CHARACTER_SET_APPLICABILITY:
  case SCH_USER_PRIVILEGES:
  case SCH_SCHEMA_PRIVILEGES:
  case SCH_TABLE_PRIVILEGES:
  case SCH_COLUMN_PRIVILEGES:
  case SCH_TABLE_CONSTRAINTS:
  case SCH_KEY_COLUMN_USAGE:
  default:
    break;
  }
  
  SELECT_LEX *select_lex= lex->current_select;
  if (make_schema_select(thd, select_lex, schema_table_idx))
  {
    DBUG_RETURN(1);
  }
  TABLE_LIST *table_list= (TABLE_LIST*) select_lex->table_list.first;
  table_list->schema_select_lex= sel;
2343
  table_list->schema_table_reformed= 1;
2344 2345
  statistic_increment(thd->status_var.com_stat[lex->orig_sql_command],
                      &LOCK_status);
2346 2347 2348 2349
  DBUG_RETURN(0);
}


2350 2351
/*
  Read query from packet and store in thd->query
2352
  Used in COM_QUERY and COM_STMT_PREPARE
2353 2354 2355 2356 2357 2358 2359

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
2360 2361
    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
2362 2363
*/

2364
bool alloc_query(THD *thd, const char *packet, uint packet_length)
2365 2366
{
  packet_length--;				// Remove end null
2367
  /* Remove garbage at start and end of query */
2368
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
2369 2370 2371 2372
  {
    packet++;
    packet_length--;
  }
2373
  const char *pos= packet + packet_length;     // Point at end null
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peter@mysql.com committed
2374
  while (packet_length > 0 &&
2375
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
2376 2377 2378 2379 2380
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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2381
  thd->query_length= 0;                        // Extra safety: Avoid races
2382 2383
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
2384 2385
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
2386
    return TRUE;
2387 2388
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
2389 2390 2391 2392

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
2393

2394
  return FALSE;
2395 2396
}

2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409
static void reset_one_shot_variables(THD *thd) 
{
  thd->variables.character_set_client=
    global_system_variables.character_set_client;
  thd->variables.collation_connection=
    global_system_variables.collation_connection;
  thd->variables.collation_database=
    global_system_variables.collation_database;
  thd->variables.collation_server=
    global_system_variables.collation_server;
  thd->update_charset();
  thd->variables.time_zone=
    global_system_variables.time_zone;
2410
  thd->variables.lc_time_names= &my_locale_en_US;
2411 2412 2413
  thd->one_shot_set= 0;
}

2414

2415
/*
2416
  Execute command saved in thd and lex->sql_command
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437

  SYNOPSIS
    mysql_execute_command()
      thd                       Thread handle

  IMPLEMENTATION

    Before every operation that can request a write lock for a table
    wait if a global read lock exists. However do not wait if this
    thread has locked tables already. No new locks can be requested
    until the other locks are released. The thread that requests the
    global read lock waits for write locked tables to become unlocked.

    Note that wait_if_global_read_lock() sets a protection against a new
    global read lock when it succeeds. This needs to be released by
    start_waiting_global_read_lock() after the operation.

  RETURN
    FALSE       OK
    TRUE        Error
*/
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bk@work.mysql.com committed
2438

2439
bool
2440
mysql_execute_command(THD *thd)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2441
{
2442 2443 2444 2445
  bool res= FALSE;
  bool need_start_waiting= FALSE; // have protection against global read lock
  int  result= 0;
  LEX  *lex= thd->lex;
monty@mysql.com's avatar
monty@mysql.com committed
2446
  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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2447
  SELECT_LEX *select_lex= &lex->select_lex;
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VIEW  
bell@sanja.is.com.ua committed
2448
  /* first table of first SELECT_LEX */
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monty@mysql.com committed
2449
  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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VIEW  
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2450 2451 2452
  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
2453
  SELECT_LEX_UNIT *unit= &lex->unit;
2454
  /* Saved variable value */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2455
  DBUG_ENTER("mysql_execute_command");
2456
  thd->net.no_send_error= 0;
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2457

2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471
  /*
    Remember first generated insert id value of the previous
    statement.  We remember it here at the beginning of the statement,
    and also in Item_func_last_insert_id::fix_fields() and
    sys_var_last_insert_id::value_ptr().  Last two places are required
    because LAST_INSERT_ID() and @@LAST_INSERT_ID may also be used in
    expression that is not executed with mysql_execute_command().

    And we remember it here because some statements read
    @@LAST_INSERT_ID indirectly, like "SELECT * FROM t1 WHERE id IS
    NULL", that may replace "id IS NULL" with "id = <LAST_INSERT_ID>".
  */
  thd->current_insert_id= thd->last_insert_id;

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2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487
  /*
    In many cases first table of main SELECT_LEX have special meaning =>
    check that it is first table in global list and relink it first in 
    queries_tables list if it is necessary (we need such relinking only
    for queries with subqueries in select list, in this case tables of
    subqueries will go to global list first)

    all_tables will differ from first_table only if most upper SELECT_LEX
    do not contain tables.

    Because of above in place where should be at least one table in most
    outer SELECT_LEX we have following check:
    DBUG_ASSERT(first_table == all_tables);
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
  */
  lex->first_lists_tables_same();
2488
  /* should be assigned after making first tables same */
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2489
  all_tables= lex->query_tables;
2490 2491 2492 2493
  /* set context for commands which do not use setup_tables */
  select_lex->
    context.resolve_in_table_list_only((TABLE_LIST*)select_lex->
                                       table_list.first);
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2494

2495 2496 2497 2498 2499
  /*
    Reset warning count for each query that uses tables
    A better approach would be to reset this for any commands
    that is not a SHOW command or a select that only access local
    variables, but for now this is probably good enough.
2500
    Don't reset warnings when executing a stored routine.
2501
  */
2502
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
2503
       lex->sroutines.records) && !thd->spcont ||
2504
      lex->time_zone_tables_used)
monty@mysql.com's avatar
monty@mysql.com committed
2505
    mysql_reset_errors(thd, 0);
2506

hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2507
#ifdef HAVE_REPLICATION
2508
  if (unlikely(thd->slave_thread))
2509
  {
peter@mysql.com's avatar
peter@mysql.com committed
2510
    /*
2511 2512
      Check if statment should be skipped because of slave filtering
      rules
2513 2514

      Exceptions are:
2515 2516
      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
2517
      - SET: we always execute it (Not that many SET commands exists in
lars@mysql.com's avatar
lars@mysql.com committed
2518 2519
        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
2520 2521
      - DROP TEMPORARY TABLE IF EXISTS: we always execute it (otherwise we
        have stale files on slave caused by exclusion of one tmp table).
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2522
    */
2523 2524
    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
2525
	!(lex->sql_command == SQLCOM_DROP_TABLE &&
2526
          lex->drop_temporary && lex->drop_if_exists) &&
guilhem@mysql.com's avatar
Merge  
guilhem@mysql.com committed
2527
        all_tables_not_ok(thd, all_tables))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2528 2529
    {
      /* we warn the slave SQL thread */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2530
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547
      if (thd->one_shot_set)
      {
        /*
          It's ok to check thd->one_shot_set here:

          The charsets in a MySQL 5.0 slave can change by both a binlogged
          SET ONE_SHOT statement and the event-internal charset setting, 
          and these two ways to change charsets do not seems to work
          together.

          At least there seems to be problems in the rli cache for
          charsets if we are using ONE_SHOT.  Note that this is normally no
          problem because either the >= 5.0 slave reads a 4.1 binlog (with
          ONE_SHOT) *or* or 5.0 binlog (without ONE_SHOT) but never both."
        */
        reset_one_shot_variables(thd);
      }
2548
      DBUG_RETURN(0);
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2549
    }
2550
  }
2551
  else
2552
  {
2553
#endif /* HAVE_REPLICATION */
2554 2555 2556 2557 2558
    /*
      When option readonly is set deny operations which change non-temporary
      tables. Except for the replication thread and the 'super' users.
    */
    if (opt_readonly &&
2559 2560 2561 2562 2563 2564 2565
        !(thd->security_ctx->master_access & SUPER_ACL) &&
        uc_update_queries[lex->sql_command] &&
        !((lex->sql_command == SQLCOM_CREATE_TABLE) &&
          (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
        !((lex->sql_command == SQLCOM_DROP_TABLE) && lex->drop_temporary) &&
        ((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
          some_non_temp_table_to_be_updated(thd, all_tables)))
2566 2567 2568 2569 2570 2571 2572
    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
2573 2574 2575
  if(lex->orig_sql_command == SQLCOM_END)
    statistic_increment(thd->status_var.com_stat[lex->sql_command],
                        &LOCK_status);
2576

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2577 2578 2579
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
2580 2581 2582 2583
    /* assign global limit variable if limit is not given */
    {
      SELECT_LEX *param= lex->unit.global_parameters;
      if (!param->explicit_limit)
2584 2585
	param->select_limit=
          new Item_int((ulonglong)thd->variables.select_limit);
2586 2587
    }

2588
    select_result *result=lex->result;
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VIEW  
bell@sanja.is.com.ua committed
2589
    if (all_tables)
bk@work.mysql.com's avatar
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2590
    {
2591 2592 2593 2594 2595 2596
      if (lex->orig_sql_command != SQLCOM_SHOW_STATUS_PROC &&
          lex->orig_sql_command != SQLCOM_SHOW_STATUS_FUNC)
        res= check_table_access(thd,
                                lex->exchange ? SELECT_ACL | FILE_ACL :
                                SELECT_ACL,
                                all_tables, 0);
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bk@work.mysql.com committed
2597 2598
    }
    else
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VIEW  
bell@sanja.is.com.ua committed
2599 2600
      res= check_access(thd,
			lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
2601
			any_db, 0, 0, 0, 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2602
    if (res)
2603
      goto error;
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bk@work.mysql.com committed
2604

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2605
    if (!(res= open_and_lock_tables(thd, all_tables)))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2606
    {
2607
      if (lex->describe)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2608
      {
2609 2610 2611 2612 2613 2614
        /*
          We always use select_send for EXPLAIN, even if it's an EXPLAIN
          for SELECT ... INTO OUTFILE: a user application should be able
          to prepend EXPLAIN to any query and receive output for it,
          even if the query itself redirects the output.
        */
2615
	if (!(result= new select_send()))
2616
	  goto error;
2617 2618
	else
	  thd->send_explain_fields(result);
2619
	res= mysql_explain_union(thd, &thd->lex->unit, result);
2620 2621 2622 2623 2624
	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
2625
	  thd->lex->unit.print(&str);
2626 2627 2628 2629
	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
2630
	result->send_eof();
2631
        delete result;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2632 2633 2634
      }
      else
      {
2635
	if (!result && !(result= new select_send()))
2636
          goto error;
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VIEW  
bell@sanja.is.com.ua committed
2637
	query_cache_store_query(thd, all_tables);
2638
	res= handle_select(thd, lex, result, 0);
2639 2640
        if (result != lex->result)
          delete result;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2641
      }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2642
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2643 2644
    break;
  }
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2645
  case SQLCOM_PREPARE:
2646
  {
2647
    mysql_sql_stmt_prepare(thd);
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sergefp@mysql.com committed
2648 2649 2650 2651
    break;
  }
  case SQLCOM_EXECUTE:
  {
2652
    mysql_sql_stmt_execute(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2653 2654 2655 2656
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2657
    mysql_sql_stmt_close(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2658 2659
    break;
  }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2660
  case SQLCOM_DO:
2661 2662
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
2663
      goto error;
2664 2665

    res= mysql_do(thd, *lex->insert_list);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2666 2667
    break;

2668
  case SQLCOM_EMPTY_QUERY:
2669
    send_ok(thd);
2670 2671
    break;

2672 2673 2674 2675
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2676
#ifndef EMBEDDED_LIBRARY
2677
  case SQLCOM_PURGE:
2678
  {
2679
    if (check_global_access(thd, SUPER_ACL))
2680
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
2681
    /* PURGE MASTER LOGS TO 'file' */
2682 2683 2684
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2685 2686
  case SQLCOM_PURGE_BEFORE:
  {
2687 2688
    Item *it;

2689 2690
    if (check_global_access(thd, SUPER_ACL))
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
2691
    /* PURGE MASTER LOGS BEFORE 'data' */
2692
    it= (Item *)lex->value_list.head();
2693
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
2694
        it->check_cols(1))
2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705
    {
      my_error(ER_WRONG_ARGUMENTS, MYF(0), "PURGE LOGS BEFORE");
      goto error;
    }
    it= new Item_func_unix_timestamp(it);
    /*
      it is OK only emulate fix_fieds, because we need only
      value of constant
    */
    it->quick_fix_field();
    res = purge_master_logs_before_date(thd, (ulong)it->val_int());
2706 2707
    break;
  }
2708
#endif
2709 2710
  case SQLCOM_SHOW_WARNS:
  {
2711 2712
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2713 2714 2715
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
2716 2717 2718 2719
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2720 2721
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
2722 2723
    break;
  }
2724 2725
  case SQLCOM_SHOW_NEW_MASTER:
  {
2726
    if (check_global_access(thd, REPL_SLAVE_ACL))
2727
      goto error;
2728
    /* This query don't work now. See comment in repl_failsafe.cc */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2729
#ifndef WORKING_NEW_MASTER
2730 2731
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2732
#else
2733 2734
    res = show_new_master(thd);
    break;
2735
#endif
2736
  }
2737

2738
#ifdef HAVE_REPLICATION
2739 2740
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
2741
    if (check_global_access(thd, REPL_SLAVE_ACL))
2742 2743 2744 2745
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
2746 2747
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
2748
    if (check_global_access(thd, REPL_SLAVE_ACL))
2749
      goto error;
2750
    res = mysql_show_binlog_events(thd);
2751 2752
    break;
  }
2753 2754
#endif

2755
  case SQLCOM_BACKUP_TABLE:
2756
  {
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VIEW  
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2757 2758 2759
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0) ||
2760
	check_global_access(thd, FILE_ACL))
2761
      goto error; /* purecov: inspected */
2762
    thd->enable_slow_log= opt_log_slow_admin_statements;
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VIEW  
bell@sanja.is.com.ua committed
2763
    res = mysql_backup_table(thd, first_table);
2764
    select_lex->table_list.first= (byte*) first_table;
2765
    lex->query_tables=all_tables;
2766 2767
    break;
  }
2768
  case SQLCOM_RESTORE_TABLE:
2769
  {
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VIEW  
bell@sanja.is.com.ua committed
2770 2771 2772
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, INSERT_ACL, all_tables, 0) ||
2773
	check_global_access(thd, FILE_ACL))
2774
      goto error; /* purecov: inspected */
2775
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2776
    res = mysql_restore_table(thd, first_table);
2777
    select_lex->table_list.first= (byte*) first_table;
2778
    lex->query_tables=all_tables;
2779 2780
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2781 2782
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2783 2784 2785
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
        check_access(thd, INDEX_ACL, first_table->db,
2786 2787
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2788
      goto error;
2789
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2790 2791
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2792 2793
  case SQLCOM_PRELOAD_KEYS:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2794 2795 2796
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_access(thd, INDEX_ACL, first_table->db,
2797 2798
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
2799
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2800
    res = mysql_preload_keys(thd, first_table);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2801 2802
    break;
  }
2803
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2804
  case SQLCOM_CHANGE_MASTER:
2805
  {
2806
    if (check_global_access(thd, SUPER_ACL))
2807
      goto error;
2808
    pthread_mutex_lock(&LOCK_active_mi);
2809
    res = change_master(thd,active_mi);
2810
    pthread_mutex_unlock(&LOCK_active_mi);
2811 2812
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2813
  case SQLCOM_SHOW_SLAVE_STAT:
2814
  {
2815 2816
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2817
      goto error;
2818
    pthread_mutex_lock(&LOCK_active_mi);
2819
    res = show_master_info(thd,active_mi);
2820
    pthread_mutex_unlock(&LOCK_active_mi);
2821 2822
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2823
  case SQLCOM_SHOW_MASTER_STAT:
2824
  {
2825 2826
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2827 2828 2829 2830
      goto error;
    res = show_binlog_info(thd);
    break;
  }
peter@mysql.com's avatar
peter@mysql.com committed
2831

2832
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
2833
    if (check_global_access(thd, SUPER_ACL))
2834
      goto error;
2835
    if (end_active_trans(thd))
2836
      goto error;
2837 2838
    else
      res = load_master_data(thd);
2839
    break;
2840
#endif /* HAVE_REPLICATION */
2841 2842 2843 2844 2845 2846 2847
#ifdef HAVE_NDBCLUSTER_DB
  case SQLCOM_SHOW_NDBCLUSTER_STATUS:
    {
      res = ndbcluster_show_status(thd);
      break;
    }
#endif
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2848 2849 2850
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2851
      if (check_global_access(thd, SUPER_ACL))
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2852 2853 2854 2855
	goto error;
      res = innodb_show_status(thd);
      break;
    }
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2856 2857 2858
  case SQLCOM_SHOW_MUTEX_STATUS:
    {
      if (check_global_access(thd, SUPER_ACL))
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2859
        goto error;
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2860 2861 2862
      res = innodb_mutex_show_status(thd);
      break;
    }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2863
#endif
2864
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2865
  case SQLCOM_LOAD_MASTER_TABLE:
2866
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2867
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2868 2869
    DBUG_ASSERT(first_table->db); /* Must be set in the parser */

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2870
    if (check_access(thd, CREATE_ACL, first_table->db,
2871 2872
		     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2873 2874 2875 2876
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2877
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2878
	goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2879
    }
2880
    if (strlen(first_table->table_name) > NAME_LEN)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2881
    {
2882
      my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2883 2884
      break;
    }
2885
    pthread_mutex_lock(&LOCK_active_mi);
2886 2887 2888 2889
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2890
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2891
			    active_mi, 0, 0))
2892
    {
2893
      send_ok(thd);
2894
    }
2895
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2896
    break;
2897
  }
2898
#endif /* HAVE_REPLICATION */
2899

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2900
  case SQLCOM_CREATE_TABLE:
2901
  {
2902
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2903 2904 2905 2906 2907 2908 2909 2910 2911 2912
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
    else 
    {
2913 2914
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
2915
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2916 2917 2918 2919 2920
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    bool link_to_local;
    // Skip first table, which is the table we are creating
    TABLE_LIST *create_table= lex->unlink_first_table(&link_to_local);
    TABLE_LIST *select_tables= lex->query_tables;
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934
    /*
      Code below (especially in mysql_create_table() and select_create
      methods) may modify HA_CREATE_INFO structure in LEX, so we have to
      use a copy of this structure to make execution prepared statement-
      safe. A shallow copy is enough as this code won't modify any memory
      referenced from this structure.
    */
    HA_CREATE_INFO create_info(lex->create_info);
    Alter_info alter_info(lex->alter_info, thd->mem_root);

    if (thd->is_fatal_error)
    {
      /* out of memory when creating a copy of alter_info */
      res= 1;
2935
      goto end_with_restore_list;
2936
    }
monty@mysql.com's avatar
monty@mysql.com committed
2937

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2938
    if ((res= create_table_precheck(thd, select_tables, create_table)))
monty@mysql.com's avatar
monty@mysql.com committed
2939
      goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2940

2941
    create_info.alias= create_table->alias;
2942

2943
#ifndef HAVE_READLINK
2944
    if (create_info.data_file_name)
2945 2946
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "DATA DIRECTORY option ignored");
2947
    if (create_info.index_file_name)
2948 2949
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "INDEX DIRECTORY option ignored");
2950
    create_info.data_file_name= create_info.index_file_name= NULL;
2951
#else
2952
    /* Fix names if symlinked tables */
2953
    if (append_file_to_dir(thd, &create_info.data_file_name,
2954
			   create_table->table_name) ||
2955
	append_file_to_dir(thd, &create_info.index_file_name,
2956
			   create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
2957
      goto end_with_restore_list;
2958
#endif
2959
    /*
2960
      If we are using SET CHARSET without DEFAULT, add an implicit
2961 2962
      DEFAULT to not confuse old users. (This may change).
    */
2963
    if ((create_info.used_fields &
2964 2965 2966
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
2967 2968 2969 2970
      create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      create_info.default_table_charset= create_info.table_charset;
      create_info.table_charset= 0;
2971
    }
2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984
    /*
      The create-select command will open and read-lock the select table
      and then create, open and write-lock the new table. If a global
      read lock steps in, we get a deadlock. The write lock waits for
      the global read lock, while the global read lock waits for the
      select table to be closed. So we wait until the global readlock is
      gone before starting both steps. Note that
      wait_if_global_read_lock() sets a protection against a new global
      read lock when it succeeds. This needs to be released by
      start_waiting_global_read_lock(). We protect the normal CREATE
      TABLE in the same way. That way we avoid that a new table is
      created during a gobal read lock.
    */
2985 2986
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
2987
    {
monty@mysql.com's avatar
monty@mysql.com committed
2988 2989
      res= 1;
      goto end_with_restore_list;
2990
    }
2991
    if (select_lex->item_list.elements)		// With select
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2992 2993
    {
      select_result *result;
2994

2995
      select_lex->options|= SELECT_NO_UNLOCK;
2996
      unit->set_limit(select_lex);
2997

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2998
      if (!(res= open_and_lock_tables(thd, select_tables)))
2999
      {
3000 3001 3002 3003
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
3004
        if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
3005
        {
3006
          TABLE_LIST *duplicate;
3007
          if ((duplicate= unique_table(thd, create_table, select_tables)))
3008 3009 3010
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
3011
            goto end_with_restore_list;
3012
          }
3013
        }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3014
        /* If we create merge table, we have to test tables in merge, too */
3015
        if (create_info.used_fields & HA_CREATE_USED_UNION)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3016 3017
        {
          TABLE_LIST *tab;
3018
          for (tab= (TABLE_LIST*) create_info.merge_list.first;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3019 3020 3021
               tab;
               tab= tab->next_local)
          {
3022
            TABLE_LIST *duplicate;
3023
            if ((duplicate= unique_table(thd, tab, select_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3024
            {
3025
              update_non_unique_table_error(tab, "CREATE", duplicate);
monty@mysql.com's avatar
monty@mysql.com committed
3026
              res= 1;
3027
              goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3028 3029 3030
            }
          }
        }
3031 3032 3033 3034
        /*
          select_create is currently not re-execution friendly and
          needs to be created for every execution of a PS/SP.
        */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3035
        if ((result= new select_create(create_table,
3036 3037 3038 3039 3040
                                       &create_info,
                                       &alter_info,
                                       select_lex->item_list,
                                       lex->duplicates,
                                       lex->ignore)))
3041 3042 3043 3044 3045
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
3046
          res= handle_select(thd, lex, result, 0);
3047
          delete result;
3048
        }
3049 3050
      }
    }
monty@mysql.com's avatar
monty@mysql.com committed
3051
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3052
    {
monty@mysql.com's avatar
monty@mysql.com committed
3053
      /* regular create */
venu@myvenu.com's avatar
venu@myvenu.com committed
3054
      if (lex->name)
3055
        res= mysql_create_like_table(thd, create_table, &create_info,
3056
                                     (Table_ident *)lex->name);
venu@myvenu.com's avatar
venu@myvenu.com committed
3057
      else
3058
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3059
        res= mysql_create_table(thd, create_table->db,
3060
                                create_table->table_name, &create_info,
3061
                                &alter_info, 0, 0);
3062
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3063
      if (!res)
3064
	send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3065
    }
3066

monty@mysql.com's avatar
monty@mysql.com committed
3067
    /* put tables back for PS rexecuting */
monty@mysql.com's avatar
monty@mysql.com committed
3068
end_with_restore_list:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3069
    lex->link_first_table_back(create_table, link_to_local);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3070
    break;
3071
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3072
  case SQLCOM_CREATE_INDEX:
3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093
    /* Fall through */
  case SQLCOM_DROP_INDEX:
  /*
    CREATE INDEX and DROP INDEX are implemented by calling ALTER
    TABLE with proper arguments. This isn't very fast but it
    should work for most cases.

    In the future ALTER TABLE will notice that only added
    indexes and create these one by one for the existing table
    without having to do a full rebuild.

    One should normally create all indexes with CREATE TABLE or
    ALTER TABLE.
  */
  {
    Alter_info alter_info(lex->alter_info, thd->mem_root);
    HA_CREATE_INFO create_info;

    if (thd->is_fatal_error) /* out of memory creating a copy of alter_info*/
      goto error;

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3094
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3095
    if (check_one_table_access(thd, INDEX_ACL, first_table))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3096
      goto error; /* purecov: inspected */
3097
    if (end_active_trans(thd))
3098
      goto error;
3099 3100 3101 3102 3103 3104
    /*
      Currently CREATE INDEX or DROP INDEX cause a full table rebuild
      and thus classify as slow administrative statements just like
      ALTER TABLE.
    */
    thd->enable_slow_log= opt_log_slow_admin_statements;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3105

3106 3107
    bzero((char*) &create_info, sizeof(create_info));
    create_info.db_type= DB_TYPE_DEFAULT;
kostja@bodhi.local's avatar
kostja@bodhi.local committed
3108
    create_info.row_type= ROW_TYPE_NOT_USED;
3109
    create_info.default_table_charset= thd->variables.collation_database;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3110

3111
    res= mysql_alter_table(thd, first_table->db, first_table->table_name,
3112
                           &create_info, first_table, &alter_info,
3113
                           0, (ORDER*) 0, 0);
3114 3115
    break;
  }
3116
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3117
  case SQLCOM_SLAVE_START:
3118
  {
3119
    pthread_mutex_lock(&LOCK_active_mi);
3120
    start_slave(thd,active_mi,1 /* net report*/);
3121
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3122
    break;
3123
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3124
  case SQLCOM_SLAVE_STOP:
3125 3126 3127 3128 3129 3130
  /*
    If the client thread has locked tables, a deadlock is possible.
    Assume that
    - the client thread does LOCK TABLE t READ.
    - then the master updates t.
    - then the SQL slave thread wants to update t,
3131
      so it waits for the client thread because t is locked by it.
3132
    - then the client thread does SLAVE STOP.
3133 3134
      SLAVE STOP waits for the SQL slave thread to terminate its
      update t, which waits for the client thread because t is locked by it.
3135 3136 3137
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
3138
  if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
3139
  {
3140 3141
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3142
    goto error;
3143
  }
3144
  {
3145
    pthread_mutex_lock(&LOCK_active_mi);
3146
    stop_slave(thd,active_mi,1/* net report*/);
3147
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3148
    break;
3149
  }
3150
#endif /* HAVE_REPLICATION */
3151

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3152
  case SQLCOM_ALTER_TABLE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3153
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3154
    {
3155
      ulong priv=0;
3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166
      /*
        Code in mysql_alter_table() may modify its HA_CREATE_INFO argument,
        so we have to use a copy of this structure to make execution
        prepared statement- safe. A shallow copy is enough as no memory
        referenced from this structure will be modified.
      */
      HA_CREATE_INFO create_info(lex->create_info);
      Alter_info alter_info(lex->alter_info, thd->mem_root);

      if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */
        goto error;
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
3167
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3168
      {
3169
	my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name);
3170
        goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3171
      }
3172 3173
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3174
      if (check_access(thd, ALTER_ACL, first_table->db,
3175 3176 3177 3178
		       &first_table->grant.privilege, 0, 0,
                       test(first_table->schema_table)) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0,
                       is_schema_db(select_lex->db))||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3179
	  check_merge_table_access(thd, first_table->db,
3180
				   (TABLE_LIST *)
3181
				   create_info.merge_list.first))
3182
	goto error;				/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3183 3184
      if (grant_option)
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3185
	if (check_grant(thd, ALTER_ACL, all_tables, 0, UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3186 3187 3188 3189 3190
	  goto error;
	if (lex->name && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
3191
	  tmp_table.table_name=lex->name;
3192
	  tmp_table.db=select_lex->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3193
	  tmp_table.grant.privilege=priv;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3194 3195
	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3196 3197 3198
	    goto error;
	}
      }
3199
      /* Don't yet allow changing of symlinks with ALTER TABLE */
3200
      if (create_info.data_file_name)
3201 3202
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "DATA DIRECTORY option ignored");
3203
      if (create_info.index_file_name)
3204 3205
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "INDEX DIRECTORY option ignored");
3206
      create_info.data_file_name= create_info.index_file_name= NULL;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3207
      /* ALTER TABLE ends previous transaction */
3208
      if (end_active_trans(thd))
3209
	goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3210
      else
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3211
      {
3212 3213 3214 3215 3216 3217 3218
        if (!thd->locked_tables &&
            !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
        {
          res= 1;
          break;
        }

3219
        thd->enable_slow_log= opt_log_slow_admin_statements;
3220 3221
        res= mysql_alter_table(thd, select_lex->db, lex->name,
                               &create_info,
3222
                               first_table,
3223 3224
                               &alter_info,
                               select_lex->order_list.elements,
3225
                               (ORDER *) select_lex->order_list.first,
3226
                               lex->ignore);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3227
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3228 3229
      break;
    }
3230
  case SQLCOM_RENAME_TABLE:
3231
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3232
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3233
    TABLE_LIST *table;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3234
    if (check_db_used(thd, all_tables))
3235
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3236
    for (table= first_table; table; table= table->next_local->next_local)
3237
    {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3238
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
3239
		       &table->grant.privilege,0,0, test(table->schema_table)) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3240
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
3241 3242
		       &table->next_local->grant.privilege, 0, 0,
                       test(table->next_local->schema_table)))
3243 3244 3245
	goto error;
      if (grant_option)
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3246
	TABLE_LIST old_list, new_list;
3247 3248 3249 3250
	/*
	  we do not need initialize old_list and new_list because we will
	  come table[0] and table->next[0] there
	*/
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3251 3252 3253 3254
	old_list= table[0];
	new_list= table->next_local[0];
	if (check_grant(thd, ALTER_ACL, &old_list, 0, 1, 0) ||
	    (!test_all_bits(table->next_local->grant.privilege,
3255
			    INSERT_ACL | CREATE_ACL) &&
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3256
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
3257 3258 3259
	  goto error;
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3260
    query_cache_invalidate3(thd, first_table, 0);
3261 3262
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table))
      goto error;
3263
    break;
3264
  }
3265
#ifndef EMBEDDED_LIBRARY
3266 3267
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3268 3269
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3270
    goto error;
3271 3272
#else
    {
3273
      if (check_global_access(thd, SUPER_ACL))
3274 3275 3276 3277
	goto error;
      res = show_binlogs(thd);
      break;
    }
peter@mysql.com's avatar
peter@mysql.com committed
3278
#endif
3279
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3280
  case SQLCOM_SHOW_CREATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3281
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3282
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3283 3284
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3285
    goto error;
3286
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3287
    {
3288 3289 3290 3291
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3292 3293
      if (check_db_used(thd, all_tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
3294 3295
		       &first_table->grant.privilege, 0, 0, 
                       test(first_table->schema_table)))
3296
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3297
      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
3298
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3299
      res= mysqld_show_create(thd, first_table);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3300 3301
      break;
    }
3302
#endif
3303 3304
  case SQLCOM_CHECKSUM:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3305 3306 3307
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
3308
      goto error; /* purecov: inspected */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3309
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3310 3311
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3312
  case SQLCOM_REPAIR:
3313
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3314 3315 3316
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
3317
      goto error; /* purecov: inspected */
3318
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3319
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3320 3321 3322
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3323
      /* Presumably, REPAIR and binlog writing doesn't require synchronization */
3324 3325
      if (mysql_bin_log.is_open())
      {
3326
	thd->clear_error(); // No binlog error generated
3327
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3328 3329 3330
        mysql_bin_log.write(&qinfo);
      }
    }
3331
    select_lex->table_list.first= (byte*) first_table;
3332
    lex->query_tables=all_tables;
3333 3334
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3335
  case SQLCOM_CHECK:
3336
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3337 3338 3339
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
3340
      goto error; /* purecov: inspected */
3341
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3342
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3343
    select_lex->table_list.first= (byte*) first_table;
3344
    lex->query_tables=all_tables;
3345 3346
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3347 3348
  case SQLCOM_ANALYZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3349 3350 3351
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3352
      goto error; /* purecov: inspected */
3353
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3354
    res = mysql_analyze_table(thd, first_table, &lex->check_opt);
3355 3356 3357
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3358
      /* Presumably, ANALYZE and binlog writing doesn't require synchronization */
3359 3360
      if (mysql_bin_log.is_open())
      {
3361
	thd->clear_error(); // No binlog error generated
3362
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3363 3364 3365
        mysql_bin_log.write(&qinfo);
      }
    }
3366
    select_lex->table_list.first= (byte*) first_table;
3367
    lex->query_tables=all_tables;
3368
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3369
  }
3370

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3371 3372
  case SQLCOM_OPTIMIZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3373 3374 3375
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3376
      goto error; /* purecov: inspected */
3377
    thd->enable_slow_log= opt_log_slow_admin_statements;
3378
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
3379
      mysql_recreate_table(thd, first_table) :
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3380
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3381 3382 3383
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3384
      /* Presumably, OPTIMIZE and binlog writing doesn't require synchronization */
3385 3386
      if (mysql_bin_log.is_open())
      {
3387
	thd->clear_error(); // No binlog error generated
3388
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3389 3390 3391
        mysql_bin_log.write(&qinfo);
      }
    }
3392
    select_lex->table_list.first= (byte*) first_table;
3393
    lex->query_tables=all_tables;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3394 3395 3396
    break;
  }
  case SQLCOM_UPDATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3397 3398
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3399
      break;
3400 3401
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3402 3403 3404 3405 3406 3407
    res= (result= mysql_update(thd, all_tables,
                               select_lex->item_list,
                               lex->value_list,
                               select_lex->where,
                               select_lex->order_list.elements,
                               (ORDER *) select_lex->order_list.first,
3408
                               unit->select_limit_cnt,
3409
                               lex->duplicates, lex->ignore));
3410
    /* mysql_update return 2 if we need to switch to multi-update */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3411
    if (result != 2)
3412
      break;
3413
  case SQLCOM_UPDATE_MULTI:
3414 3415 3416 3417
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
    if (result != 2)
3418
    {
3419 3420 3421 3422 3423
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3424

3425
    res= mysql_multi_update_prepare(thd);
3426

3427
#ifdef HAVE_REPLICATION
3428
    /* Check slave filtering rules */
3429
    if (unlikely(thd->slave_thread))
3430
    {
3431 3432
      if (all_tables_not_ok(thd, all_tables))
      {
3433 3434 3435 3436 3437
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
3438 3439 3440 3441
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
3442 3443
      if (res)
        break;
3444
    }
3445 3446
    else
    {
3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459
#endif /* HAVE_REPLICATION */
      if (res)
        break;
      if (opt_readonly &&
	  !(thd->security_ctx->master_access & SUPER_ACL) &&
	  some_non_temp_table_to_be_updated(thd, all_tables))
      {
	my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
	break;
      }
#ifdef HAVE_REPLICATION
    }  /* unlikely */
#endif
3460

3461 3462 3463 3464 3465 3466
    res= mysql_multi_update(thd, all_tables,
                            &select_lex->item_list,
                            &lex->value_list,
                            select_lex->where,
                            select_lex->options,
                            lex->duplicates, lex->ignore, unit, select_lex);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3467
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3468
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3469
  case SQLCOM_REPLACE:
3470 3471
  case SQLCOM_INSERT:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3472
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mysql.com's avatar
monty@mysql.com committed
3473
    if ((res= insert_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3474
      break;
3475 3476 3477 3478 3479 3480 3481 3482

    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3483
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
monty@mishka.local's avatar
monty@mishka.local committed
3484
		      lex->update_list, lex->value_list,
3485
                      lex->duplicates, lex->ignore);
3486 3487 3488 3489 3490 3491 3492

    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3493
    if (first_table->view && !first_table->contain_auto_increment)
3494 3495
      thd->last_insert_id= thd->current_insert_id;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3496
    break;
3497
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3498 3499 3500
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
monty@mysql.com's avatar
monty@mysql.com committed
3501
    select_result *result;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3502
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mishka.local's avatar
monty@mishka.local committed
3503
    if ((res= insert_precheck(thd, all_tables)))
3504
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3505

3506
    /* Fix lock for first table */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3507 3508
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3509

3510 3511
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3512

3513
    unit->set_limit(select_lex);
3514 3515 3516 3517 3518 3519 3520 3521

    if (! thd->locked_tables &&
        ! (need_start_waiting= ! wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3522
    if (!(res= open_and_lock_tables(thd, all_tables)))
3523
    {
3524
      /* Skip first table, which is the table we are inserting in */
3525 3526
      TABLE_LIST *second_table= first_table->next_local;
      select_lex->table_list.first= (byte*) second_table;
3527 3528
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
3529 3530 3531
      res= mysql_insert_select_prepare(thd);
      if (!res && (result= new select_insert(first_table, first_table->table,
                                             &lex->field_list,
3532 3533
                                             &lex->update_list,
                                             &lex->value_list,
3534
                                             lex->duplicates, lex->ignore)))
3535
      {
3536
	res= handle_select(thd, lex, result, OPTION_SETUP_TABLES_DONE);
3537 3538 3539 3540 3541 3542 3543 3544 3545
        /*
          Invalidate the table in the query cache if something changed
          after unlocking when changes become visible.
          TODO: this is workaround. right way will be move invalidating in
          the unlock procedure.
        */
        if (first_table->lock_type ==  TL_WRITE_CONCURRENT_INSERT &&
            thd->lock)
        {
3546 3547 3548
          /* INSERT ... SELECT should invalidate only the very first table */
          TABLE_LIST *save_table= first_table->next_local;
          first_table->next_local= 0;
3549 3550
          mysql_unlock_tables(thd, thd->lock);
          query_cache_invalidate3(thd, first_table, 1);
3551
          first_table->next_local= save_table;
3552 3553
          thd->lock=0;
        }
3554 3555
        delete result;
      }
3556
      /* revert changes for SP */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
3557
      select_lex->table_list.first= (byte*) first_table;
3558
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3559

3560 3561 3562 3563 3564 3565
    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3566
    if (first_table->view && !first_table->contain_auto_increment)
3567 3568
      thd->last_insert_id= thd->current_insert_id;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3569 3570
    break;
  }
3571
  case SQLCOM_TRUNCATE:
3572 3573 3574 3575 3576
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3577 3578
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, DELETE_ACL, all_tables))
3579
      goto error;
3580 3581 3582 3583
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3584
    if (thd->locked_tables || thd->active_transaction())
3585
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3586 3587
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3588 3589
      goto error;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3590

monty@mysql.com's avatar
monty@mysql.com committed
3591
    res= mysql_truncate(thd, first_table, 0);
3592
    break;
3593
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3594
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3595 3596
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3597
      break;
3598 3599
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
3600 3601 3602 3603 3604 3605 3606 3607

    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3608
    res = mysql_delete(thd, all_tables, select_lex->where,
3609
                       &select_lex->order_list,
osku@127.(none)'s avatar
osku@127.(none) committed
3610 3611
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3612 3613
    break;
  }
3614
  case SQLCOM_DELETE_MULTI:
3615
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3616
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3617
    TABLE_LIST *aux_tables=
3618
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
3619
    multi_delete *result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3620

3621 3622 3623 3624 3625 3626 3627
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

3628
    if ((res= multi_delete_precheck(thd, all_tables)))
3629
      break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3630

3631
    /* condition will be TRUE on SP re-excuting */
3632 3633
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3634
    if (add_item_to_list(thd, new Item_null()))
3635
      goto error;
3636

3637
    thd->proc_info="init";
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3638 3639 3640 3641
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
3642
      goto error;
3643

3644
    if (!thd->is_fatal_error && (result= new multi_delete(aux_tables,
3645
							  lex->table_count)))
3646
    {
3647 3648 3649
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3650
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3651
			select_lex->where,
3652
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3653 3654
			(ORDER *)NULL,
			select_lex->options | thd->options |
3655 3656
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
3657
			result, unit, select_lex);
3658
      delete result;
3659 3660
    }
    else
3661
      res= TRUE;                                // Error
3662 3663
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3664
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3665
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3666
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3667 3668
    if (!lex->drop_temporary)
    {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3669
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
3670 3671
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
3672
        goto error;
3673
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3674
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3675 3676 3677 3678 3679 3680
    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
monty@mysql.com's avatar
monty@mysql.com committed
3681 3682
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3683 3684 3685
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
3686

3687 3688
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3689
    }
3690
    /* DDL and binlog write order protected by LOCK_open */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3691 3692
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3693 3694
  }
  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3695
  case SQLCOM_SHOW_PROCESSLIST:
3696 3697
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3698
      break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3699
    mysqld_list_processes(thd,
3700 3701 3702 3703
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3704
    break;
3705 3706
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
3707 3708 3709 3710 3711 3712 3713
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3714 3715
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3716 3717
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3718
    goto error;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3719 3720
#else
    {
3721
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0,0))
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3722 3723 3724 3725
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3726 3727
#endif
  case SQLCOM_CHANGE_DB:
3728 3729
    if (!mysql_change_db(thd,select_lex->db,FALSE))
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3730
    break;
3731

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3732 3733
  case SQLCOM_LOAD:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3734
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3735
    uint privilege= (lex->duplicates == DUP_REPLACE ?
3736 3737
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3738

3739
    if (lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3740
    {
3741
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
3742
          !opt_local_infile)
3743
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3744
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3745 3746
	goto error;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3747
    }
3748 3749 3750 3751

    if (check_one_table_access(thd, privilege, all_tables))
      goto error;

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3752
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
3753
                    lex->update_list, lex->value_list, lex->duplicates,
3754
                    lex->ignore, (bool) lex->local_file);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3755 3756
    break;
  }
3757

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3758
  case SQLCOM_SET_OPTION:
3759 3760
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3761
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
3762 3763
	 open_and_lock_tables(thd, all_tables)))
      goto error;
3764 3765
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
3766 3767
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3768 3769 3770 3771 3772 3773 3774 3775
    }
    if (!(res= sql_set_variables(thd, lex_var_list)))
    {
      /*
        If the previous command was a SET ONE_SHOT, we don't want to forget
        about the ONE_SHOT property of that SET. So we use a |= instead of = .
      */
      thd->one_shot_set|= lex->one_shot_set;
3776
      send_ok(thd);
3777
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3778
    break;
3779
  }
3780

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3781
  case SQLCOM_UNLOCK_TABLES:
3782 3783 3784 3785 3786 3787
    /*
      It is critical for mysqldump --single-transaction --master-data that
      UNLOCK TABLES does not implicitely commit a connection which has only
      done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes
      false, mysqldump will not work.
    */
3788
    unlock_locked_tables(thd);
3789 3790
    if (thd->options & OPTION_TABLE_LOCK)
    {
3791
      end_active_trans(thd);
3792
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3793 3794
    }
    if (thd->global_read_lock)
3795
      unlock_global_read_lock(thd);
3796
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3797 3798
    break;
  case SQLCOM_LOCK_TABLES:
3799
    unlock_locked_tables(thd);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3800
    if (check_db_used(thd, all_tables) || end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3801
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3802
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3803
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3804
    thd->in_lock_tables=1;
3805
    thd->options|= OPTION_TABLE_LOCK;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3806

3807
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3808
    {
3809 3810
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3811
	query_cache.invalidate_locked_for_write(first_table);
3812
#endif /*HAVE_QUERY_CACHE*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3813 3814
      thd->locked_tables=thd->lock;
      thd->lock=0;
3815
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3816
    }
3817 3818
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3819 3820 3821
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3822
  {
3823 3824 3825 3826 3827 3828
    /*
      As mysql_create_db() may modify HA_CREATE_INFO structure passed to
      it, we need to use a copy of LEX::create_info to make execution
      prepared statement- safe.
    */
    HA_CREATE_INFO create_info(lex->create_info);
3829 3830 3831 3832 3833
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3834
    char *alias;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3835
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3836
    {
3837
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3838 3839
      break;
    }
3840 3841 3842
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3843
      For that reason, db_ok() in sql/slave.cc did not check the
3844 3845 3846
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
3847
#ifdef HAVE_REPLICATION
3848
    if (thd->slave_thread &&
3849 3850
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3851
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3852
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3853
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3854
    }
3855
#endif
3856

3857
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3858
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3859
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
3860
			 &create_info, 0);
3861 3862
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3863
  case SQLCOM_DROP_DB:
3864
  {
3865 3866 3867 3868 3869
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3870
    if (check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3871
    {
3872
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3873 3874
      break;
    }
3875 3876 3877 3878 3879 3880 3881
    /*
      If in a slave thread :
      DROP DATABASE DB may not be preceded by USE DB.
      For that reason, maybe db_ok() in sql/slave.cc did not check the 
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
3882
#ifdef HAVE_REPLICATION
3883 3884 3885
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3886
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3887
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3888
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3889
    }
3890
#endif
3891
    if (check_access(thd,DROP_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3892
      break;
3893 3894
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3895 3896
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3897 3898
      goto error;
    }
3899
    res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0);
3900 3901
    break;
  }
3902 3903
  case SQLCOM_ALTER_DB:
  {
3904 3905
    char *db= lex->name;
    DBUG_ASSERT(db); /* Must be set in the parser */
3906
    if (!strip_sp(db) || check_db_name(db))
3907
    {
3908
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3909 3910
      break;
    }
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3911 3912 3913
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3914
      For that reason, maybe db_ok() in sql/slave.cc did not check the
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3915 3916 3917 3918
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
#ifdef HAVE_REPLICATION
3919
    if (thd->slave_thread &&
3920 3921
	(!db_ok(db, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(db)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3922
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3923
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3924 3925 3926
      break;
    }
#endif
3927
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0, is_schema_db(db)))
3928 3929 3930
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3931 3932
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3933 3934
      goto error;
    }
3935
    res= mysql_alter_db(thd, db, &lex->create_info);
3936 3937
    break;
  }
3938 3939 3940 3941
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3942
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3943 3944
      break;
    }
3945
    if (check_access(thd,SELECT_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3946
      break;
3947
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
3948 3949
    break;
  }
monty@mysql.com's avatar
monty@mysql.com committed
3950
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
monty@mysql.com's avatar
monty@mysql.com committed
3951
  {
3952
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
monty@mysql.com's avatar
monty@mysql.com committed
3953
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3954
#ifdef HAVE_DLOPEN
3955 3956
    if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                        &thd->sp_func_cache, FALSE))
monty@mysql.com's avatar
monty@mysql.com committed
3957
    {
3958
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
monty@mysql.com's avatar
monty@mysql.com committed
3959 3960
      goto error;
    }
3961
    if (!(res = mysql_create_function(thd, &lex->udf)))
monty@mysql.com's avatar
monty@mysql.com committed
3962
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3963
#else
hf@deer.(none)'s avatar
hf@deer.(none) committed
3964
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
3965
    res= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3966 3967
#endif
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3968
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3969
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3970 3971
  case SQLCOM_CREATE_USER:
  {
3972
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
3973
        check_global_access(thd,CREATE_USER_ACL))
3974
      break;
3975 3976
    if (end_active_trans(thd))
      goto error;
3977
    /* Conditionally writes to binlog */
3978 3979 3980 3981
    if (!(res= mysql_create_user(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
3982 3983
  case SQLCOM_DROP_USER:
  {
3984
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
3985
        check_global_access(thd,CREATE_USER_ACL))
3986
      break;
3987 3988
    if (end_active_trans(thd))
      goto error;
3989
    /* Conditionally writes to binlog */
3990
    if (!(res= mysql_drop_user(thd, lex->users_list)))
3991 3992 3993 3994 3995
      send_ok(thd);
    break;
  }
  case SQLCOM_RENAME_USER:
  {
3996
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3997
        check_global_access(thd,CREATE_USER_ACL))
3998
      break;
3999 4000
    if (end_active_trans(thd))
      goto error;
4001
    /* Conditionally writes to binlog */
4002
    if (!(res= mysql_rename_user(thd, lex->users_list)))
4003 4004 4005 4006 4007
      send_ok(thd);
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
4008
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
4009
        check_global_access(thd,CREATE_USER_ACL))
4010
      break;
4011
    /* Conditionally writes to binlog */
4012 4013 4014 4015
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
4016 4017 4018 4019
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
serg@serg.mylan's avatar
serg@serg.mylan committed
4020
		     first_table ?  first_table->db : select_lex->db,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4021
		     first_table ? &first_table->grant.privilege : 0,
4022 4023 4024
		     first_table ? 0 : 1, 0,
                     first_table ? (bool) first_table->schema_table :
                     select_lex->db ? is_schema_db(select_lex->db) : 0))
4025 4026
      goto error;

4027
    if (thd->security_ctx->user)              // If not replication
4028
    {
4029
      LEX_USER *user, *tmp_user;
4030

4031
      List_iterator <LEX_USER> user_list(lex->users_list);
4032
      while ((tmp_user= user_list++))
4033
      {
4034 4035
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
4036 4037 4038 4039 4040 4041 4042 4043
        if (specialflag & SPECIAL_NO_RESOLVE &&
            hostname_requires_resolving(user->host.str))
          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                              ER_WARN_HOSTNAME_WONT_WORK,
                              ER(ER_WARN_HOSTNAME_WONT_WORK),
                              user->host.str);
        // Are we trying to change a password of another user
        DBUG_ASSERT(user->host.str != 0);
4044
        if (strcmp(thd->security_ctx->user, user->user.str) ||
4045
            my_strcasecmp(system_charset_info,
4046
                          user->host.str, thd->security_ctx->host_or_ip))
4047 4048
        {
          // TODO: use check_change_password()
4049 4050
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
4051
              check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
4052 4053 4054 4055 4056 4057
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4058 4059
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4060
    if (first_table)
4061
    {
4062 4063
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
4064 4065 4066 4067 4068
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
4069 4070
	    check_grant_routine(thd, grants | GRANT_ACL, all_tables,
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
4071
	  goto error;
4072
        /* Conditionally writes to binlog */
4073 4074 4075 4076
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
4077 4078 4079 4080 4081 4082 4083 4084
      }
      else
      {
	if (grant_option && check_grant(thd,
					(lex->grant | lex->grant_tot_col |
					 GRANT_ACL),
					all_tables, 0, UINT_MAX, 0))
	  goto error;
4085
        /* Conditionally writes to binlog */
4086 4087 4088 4089
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
4090 4091 4092
    }
    else
    {
4093
      if (lex->columns.elements || lex->type)
4094
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4095 4096
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
4097
        goto error;
4098 4099
      }
      else
4100
	/* Conditionally writes to binlog */
4101 4102 4103 4104
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
4105
	if (lex->sql_command == SQLCOM_GRANT)
4106
	{
4107
	  List_iterator <LEX_USER> str_list(lex->users_list);
4108 4109 4110 4111 4112
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
monty@mysql.com's avatar
monty@mysql.com committed
4113
	    reset_mqh(user);
4114
          }
4115
	}
4116 4117 4118 4119
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4120
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
4121
  case SQLCOM_RESET:
4122 4123 4124
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
4125 4126 4127 4128
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
4129
    bool write_to_binlog;
4130
    if (check_global_access(thd,RELOAD_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4131
      goto error;
4132

4133 4134 4135 4136
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
4137
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
4138 4139 4140 4141 4142
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
4143
      /* Presumably, RESET and binlog writing doesn't require synchronization */
4144 4145 4146 4147
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
4148
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
4149 4150 4151 4152
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
4153 4154
    } 
    
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4155
    break;
4156
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4157
  case SQLCOM_KILL:
4158 4159 4160
  {
    Item *it= (Item *)lex->value_list.head();

4161
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
4162 4163 4164 4165 4166 4167
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
    kill_one_thread(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4168
    break;
4169
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
4170
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4171
  case SQLCOM_SHOW_GRANTS:
4172 4173 4174 4175
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
4176
    if ((thd->security_ctx->priv_user &&
4177
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
4178
	!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4179
    {
4180
      res = mysql_show_grants(thd, grant_user);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4181 4182
    }
    break;
4183
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
4184
#endif
4185
  case SQLCOM_HA_OPEN:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4186 4187 4188
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0))
4189
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
4190
    res= mysql_ha_open(thd, first_table, 0);
4191 4192
    break;
  case SQLCOM_HA_CLOSE:
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VIEW  
bell@sanja.is.com.ua committed
4193 4194
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables))
4195
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4196
    res= mysql_ha_close(thd, first_table);
4197 4198
    break;
  case SQLCOM_HA_READ:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4199
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
4200 4201 4202 4203 4204
    /*
      There is no need to check for table permissions here, because
      if a user has no permissions to read a table, he won't be
      able to open it (with SQLCOM_HA_OPEN) in the first place.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4205
    if (check_db_used(thd, all_tables))
4206
      goto error;
4207
    unit->set_limit(select_lex);
4208
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4209
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
4210
                       unit->select_limit_cnt, unit->offset_limit_cnt);
4211 4212
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4213
  case SQLCOM_BEGIN:
4214 4215 4216 4217 4218 4219
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
    {
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xid_state.xa_state]);
      break;
    }
4220
    if (begin_trans(thd))
4221
      goto error;
serg@serg.mylan's avatar
serg@serg.mylan committed
4222
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4223 4224
    break;
  case SQLCOM_COMMIT:
4225
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
4226
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
4227
      goto error;
4228
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4229 4230
    break;
  case SQLCOM_ROLLBACK:
4231
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
4232
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
4233
      goto error;
4234
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4235
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
4236
  case SQLCOM_RELEASE_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
4237
  {
4238 4239
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
serg@serg.mylan's avatar
serg@serg.mylan committed
4240 4241 4242
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
4243
                       (uchar *)sv->name, sv->length) == 0)
serg@serg.mylan's avatar
serg@serg.mylan committed
4244 4245
        break;
    }
4246
    if (sv)
serg@serg.mylan's avatar
serg@serg.mylan committed
4247
    {
4248
      if (ha_release_savepoint(thd, sv))
serg@serg.mylan's avatar
serg@serg.mylan committed
4249
        res= TRUE; // cannot happen
serg@serg.mylan's avatar
serg@serg.mylan committed
4250 4251
      else
        send_ok(thd);
4252
      thd->transaction.savepoints=sv->prev;
serg@serg.mylan's avatar
serg@serg.mylan committed
4253
    }
4254
    else
serg@serg.mylan's avatar
serg@serg.mylan committed
4255
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4256
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
4257
  }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4258
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
4259
  {
4260 4261
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
4262 4263 4264
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
4265
                       (uchar *)sv->name, sv->length) == 0)
4266 4267
        break;
    }
4268
    if (sv)
4269
    {
4270
      if (ha_rollback_to_savepoint(thd, sv))
4271 4272
        res= TRUE; // cannot happen
      else
serg@serg.mylan's avatar
serg@serg.mylan committed
4273 4274 4275 4276 4277 4278 4279 4280
      {
        if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) &&
            !thd->slave_thread)
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_WARNING_NOT_COMPLETE_ROLLBACK,
                       ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
        send_ok(thd);
      }
4281
      thd->transaction.savepoints=sv;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4282 4283
    }
    else
4284
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4285
    break;
4286
  }
4287
  case SQLCOM_SAVEPOINT:
4288 4289
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
          thd->in_sub_stmt) || !opt_using_transactions)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4290
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4291
    else
4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329
    {
      SAVEPOINT **sv, *newsv;
      for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev)
      {
        if (my_strnncoll(system_charset_info,
                         (uchar *)lex->ident.str, lex->ident.length,
                         (uchar *)(*sv)->name, (*sv)->length) == 0)
          break;
      }
      if (*sv) /* old savepoint of the same name exists */
      {
        newsv=*sv;
        ha_release_savepoint(thd, *sv); // it cannot fail
        *sv=(*sv)->prev;
      }
      else if ((newsv=(SAVEPOINT *) alloc_root(&thd->transaction.mem_root,
                                               savepoint_alloc_size)) == 0)
      {
        my_error(ER_OUT_OF_RESOURCES, MYF(0));
        break;
      }
      newsv->name=strmake_root(&thd->transaction.mem_root,
                               lex->ident.str, lex->ident.length);
      newsv->length=lex->ident.length;
      /*
        if we'll get an error here, don't add new savepoint to the list.
        we'll lose a little bit of memory in transaction mem_root, but it'll
        be free'd when transaction ends anyway
      */
      if (ha_savepoint(thd, newsv))
        res= TRUE;
      else
      {
        newsv->prev=thd->transaction.savepoints;
        thd->transaction.savepoints=newsv;
        send_ok(thd);
      }
    }
4330
    break;
4331 4332
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
monty@mysql.com's avatar
monty@mysql.com committed
4333
  {
4334
    uint namelen;
4335
    char *name;
4336
    int result= SP_INTERNAL_ERROR;
4337

4338
    DBUG_ASSERT(lex->sphead != 0);
4339
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
4340 4341 4342 4343 4344 4345 4346
    /*
      Verify that the database name is allowed, optionally
      lowercase it.
    */
    if (check_db_name(lex->sphead->m_db.str))
    {
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
4347
      goto create_sp_error;
4348 4349 4350
    }

    /*
4351 4352 4353
      Check that a database directory with this name
      exists. Design note: This won't work on virtual databases
      like information_schema.
4354 4355 4356 4357
    */
    if (check_db_dir_existence(lex->sphead->m_db.str))
    {
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
4358
      goto create_sp_error;
4359 4360
    }

4361 4362
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                     is_schema_db(lex->sphead->m_db.str)))
4363
      goto create_sp_error;
4364

4365 4366
    if (end_active_trans(thd))
      goto create_sp_error;
4367 4368

    name= lex->sphead->name(&namelen);
4369
#ifdef HAVE_DLOPEN
monty@mysql.com's avatar
monty@mysql.com committed
4370 4371 4372
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
4373

monty@mysql.com's avatar
monty@mysql.com committed
4374
      if (udf)
4375
      {
4376 4377
        my_error(ER_UDF_EXISTS, MYF(0), name);
        goto create_sp_error;
4378
      }
monty@mysql.com's avatar
monty@mysql.com committed
4379 4380 4381
    }
#endif

4382 4383 4384
    /*
      If the definer is not specified, this means that CREATE-statement missed
      DEFINER-clause. DEFINER-clause can be missed in two cases:
4385

4386 4387 4388 4389 4390 4391 4392 4393
        - The user submitted a statement w/o the clause. This is a normal
          case, we should assign CURRENT_USER as definer.

        - Our slave received an updated from the master, that does not
          replicate definer for stored rountines. We should also assign
          CURRENT_USER as definer here, but also we should mark this routine
          as NON-SUID. This is essential for the sake of backward
          compatibility.
4394

4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418
          The problem is the slave thread is running under "special" user (@),
          that actually does not exist. In the older versions we do not fail
          execution of a stored routine if its definer does not exist and
          continue the execution under the authorization of the invoker
          (BUG#13198). And now if we try to switch to slave-current-user (@),
          we will fail.

          Actually, this leads to the inconsistent state of master and
          slave (different definers, different SUID behaviour), but it seems,
          this is the best we can do.
    */

    if (!lex->definer)
    {
      bool res= FALSE;
      Query_arena original_arena;
      Query_arena *ps_arena = thd->activate_stmt_arena_if_needed(&original_arena);

      if (!(lex->definer= create_default_definer(thd)))
        res= TRUE;

      if (ps_arena)
        thd->restore_active_arena(ps_arena, &original_arena);

4419
      /* Error has been already reported. */
4420
      if (res)
4421
        goto create_sp_error;
4422 4423 4424 4425 4426 4427 4428 4429 4430 4431

      if (thd->slave_thread)
        lex->sphead->m_chistics->suid= SP_IS_NOT_SUID;
    }

    /*
      If the specified definer differs from the current user, we should check
      that the current user has SUPER privilege (in order to create a stored
      routine under another user one must have SUPER privilege).
    */
4432

4433 4434 4435 4436 4437 4438 4439 4440
    else if (strcmp(lex->definer->user.str, thd->security_ctx->priv_user) ||
        my_strcasecmp(system_charset_info,
                      lex->definer->host.str,
                      thd->security_ctx->priv_host))
    {
      if (check_global_access(thd, SUPER_ACL))
      {
        my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
4441
        goto create_sp_error;
4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459
      }
    }

    /* Check that the specified definer exists. Emit a warning if not. */

#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (!is_acl_user(lex->definer->host.str,
                     lex->definer->user.str))
    {
      push_warning_printf(thd,
                          MYSQL_ERROR::WARN_LEVEL_NOTE,
                          ER_NO_SUCH_USER,
                          ER(ER_NO_SUCH_USER),
                          lex->definer->user.str,
                          lex->definer->host.str);
    }
#endif /* NO_EMBEDDED_ACCESS_CHECKS */

4460
    res= (result= lex->sphead->create(thd));
4461 4462
    switch (result) {
    case SP_OK:
4463
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4464
      /* only add privileges if really neccessary */
4465
      if (sp_automatic_privileges && !opt_noacl &&
4466
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
4467
                               lex->sphead->m_db.str, name,
4468
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
4469
      {
4470
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
4471
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
4472 4473 4474 4475
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_PROC_AUTO_GRANT_FAIL,
                       ER(ER_PROC_AUTO_GRANT_FAIL));
        close_thread_tables(thd);
4476
      }
4477
#endif
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4478
    break;
4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505
    case SP_WRITE_ROW_FAILED:
      my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    case SP_BAD_IDENTIFIER:
      my_error(ER_TOO_LONG_IDENT, MYF(0), name);
    break;
    case SP_BODY_TOO_LONG:
      my_error(ER_TOO_LONG_BODY, MYF(0), name);
    break;
    default:
      my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    } /* end switch */

    /*
      Capture all errors within this CASE and
      clean up the environment.
    */
create_sp_error:
    lex->unit.cleanup();
    delete lex->sphead;
    lex->sphead= 0;
    if (result != SP_OK )
      goto error;
    send_ok(thd);
    break; /* break super switch */
  } /* end case group bracket */
4506 4507 4508 4509
  case SQLCOM_CALL:
    {
      sp_head *sp;

4510 4511 4512 4513 4514 4515 4516 4517 4518
      /*
        This will cache all SP and SF and open and lock all tables
        required for execution.
      */
      if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
	  open_and_lock_tables(thd, all_tables))
       goto error;

      /*
4519 4520
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4521
      */
4522 4523
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
4524
      {
4525
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
4526
                 lex->spname->m_qname.str);
4527
	goto error;
4528 4529 4530
      }
      else
      {
pem@mysql.comhem.se's avatar
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4531
	ha_rows select_limit;
monty@mysql.com's avatar
monty@mysql.com committed
4532 4533
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545
        /*
          Check that the stored procedure doesn't contain Dynamic SQL
          and doesn't return result sets: such stored procedures can't
          be called from a function or trigger.
        */
        if (thd->in_sub_stmt)
        {
          const char *where= (thd->in_sub_stmt & SUB_STMT_TRIGGER ?
                              "trigger" : "function");
          if (sp->is_not_allowed_in_function(where))
            goto error;
        }
4546

4547
	my_bool save_no_send_ok= thd->net.no_send_ok;
4548
	thd->net.no_send_ok= TRUE;
4549
	if (sp->m_flags & sp_head::MULTI_RESULTS)
4550
	{
4551
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4552
	  {
4553 4554 4555 4556
            /*
              The client does not support multiple result sets being sent
              back
            */
4557
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4558
	    thd->net.no_send_ok= save_no_send_ok;
4559 4560
	    goto error;
	  }
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4561 4562 4563 4564 4565 4566 4567
          /*
            If SERVER_MORE_RESULTS_EXISTS is not set,
            then remember that it should be cleared
          */
	  bits_to_be_cleared= (~thd->server_status &
                               SERVER_MORE_RESULTS_EXISTS);
	  thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
4568 4569
	}

4570
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4571
	if (check_routine_access(thd, EXECUTE_ACL,
4572
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
4573
	{
4574
	  thd->net.no_send_ok= save_no_send_ok;
4575 4576
	  goto error;
	}
4577
#endif
pem@mysql.comhem.se's avatar
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4578 4579
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4580

4581
        /* 
4582
          We never write CALL statements into binlog:
4583 4584 4585 4586 4587
           - If the mode is non-prelocked, each statement will be logged
             separately.
           - If the mode is prelocked, the invoking statement will care
             about writing into binlog.
          So just execute the statement.
4588
        */
4589
	res= sp->execute_procedure(thd, &lex->value_list);
4590 4591 4592
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
4593 4594 4595 4596
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

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4597
	thd->variables.select_limit= select_limit;
4598

4599
	thd->net.no_send_ok= save_no_send_ok;
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monty@mysql.com committed
4600
        thd->server_status&= ~bits_to_be_cleared;
4601

4602
	if (!res)
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4603 4604
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
4605 4606
	else
	  goto error;		// Substatement should already have sent error
4607
      }
4608
      break;
4609 4610
    }
  case SQLCOM_ALTER_PROCEDURE:
4611
  case SQLCOM_ALTER_FUNCTION:
4612
    {
4613
      int result;
4614 4615 4616 4617
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
4618
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4619 4620
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
4621
      else
4622 4623
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
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monty@mysql.com committed
4624
      mysql_reset_errors(thd, 0);
4625
      if (! sp)
4626 4627 4628 4629 4630 4631 4632 4633 4634
      {
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
4635 4636
      else
      {
4637 4638 4639
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
4640
	  goto error;
4641 4642 4643

        if (end_active_trans(thd)) 
          goto error;
4644
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
4645 4646
        if ((sp->m_type == TYPE_ENUM_FUNCTION) &&
            !trust_function_creators &&  mysql_bin_log.is_open() &&
4647 4648 4649 4650 4651 4652 4653 4654 4655 4656
            !sp->m_chistics->detistic &&
            (chistics.daccess == SP_CONTAINS_SQL ||
             chistics.daccess == SP_MODIFIES_SQL_DATA))
        {
          my_message(ER_BINLOG_UNSAFE_ROUTINE,
		     ER(ER_BINLOG_UNSAFE_ROUTINE), MYF(0));
          result= SP_INTERNAL_ERROR;
        }
        else
        {
4657 4658 4659 4660 4661 4662
          /*
            Note that if you implement the capability of ALTER FUNCTION to
            alter the body of the function, this command should be made to
            follow the restrictions that log-bin-trust-function-creators=0
            already puts on CREATE FUNCTION.
          */
4663
          if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4664
            /* Conditionally writes to binlog */
4665 4666
            result= sp_update_procedure(thd, lex->spname, &lex->sp_chistics);
          else
4667
            /* Conditionally writes to binlog */
4668 4669
            result= sp_update_function(thd, lex->spname, &lex->sp_chistics);
        }
4670
      }
4671
      switch (result)
4672
      {
4673
      case SP_OK:
4674
	send_ok(thd);
4675 4676
	break;
      case SP_KEY_NOT_FOUND:
4677 4678
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4679 4680
	goto error;
      default:
4681 4682
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4683
	goto error;
4684
      }
4685
      break;
4686 4687
    }
  case SQLCOM_DROP_PROCEDURE:
4688
  case SQLCOM_DROP_FUNCTION:
4689
    {
4690
      int result;
4691 4692
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
4693

4694
      result= sp_routine_exists_in_table(thd, type, lex->spname);
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monty@mysql.com committed
4695
      mysql_reset_errors(thd, 0);
4696
      if (result == SP_OK)
4697
      {
4698 4699 4700
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

4701 4702
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
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4703
          goto error;
4704 4705 4706

        if (end_active_trans(thd)) 
          goto error;
4707
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4708
	if (sp_automatic_privileges && !opt_noacl &&
4709 4710
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4711 4712 4713 4714 4715
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
4716
#endif
4717
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
4718 4719
          /* Conditionally writes to binlog */
	  result= sp_drop_procedure(thd, lex->spname); /* Conditionally writes to binlog */
4720
	else
4721 4722
          /* Conditionally writes to binlog */
	  result= sp_drop_function(thd, lex->spname); /* Conditionally writes to binlog */
4723 4724 4725
      }
      else
      {
4726
#ifdef HAVE_DLOPEN
4727 4728 4729 4730 4731 4732
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
4733
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
4734
	      goto error;
4735 4736

	    /* Does NOT write to binlog */
4737
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4738
	    {
4739 4740
	      send_ok(thd);
	      break;
4741 4742
	    }
	  }
4743
	}
4744
#endif
4745 4746 4747 4748 4749 4750 4751
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4752
      }
4753 4754
      res= result;
      switch (result)
4755 4756
      {
      case SP_OK:
4757
	send_ok(thd);
4758 4759
	break;
      case SP_KEY_NOT_FOUND:
4760 4761
	if (lex->drop_if_exists)
	{
4762
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4763
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4764
			      SP_COM_STRING(lex), lex->spname->m_name.str);
4765
	  res= FALSE;
4766 4767 4768
	  send_ok(thd);
	  break;
	}
4769 4770
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4771 4772
	goto error;
      default:
4773 4774
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4775
	goto error;
4776
      }
4777
      break;
4778
    }
4779 4780
  case SQLCOM_SHOW_CREATE_PROC:
    {
4781
      if (lex->spname->m_name.length > NAME_LEN)
4782
      {
4783
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4784 4785
	goto error;
      }
4786
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
4787
      {			/* We don't distinguish between errors for now */
4788 4789
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4790 4791 4792 4793 4794 4795
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
4796
      if (lex->spname->m_name.length > NAME_LEN)
4797
      {
4798
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4799 4800
	goto error;
      }
4801
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
4802
      {			/* We don't distinguish between errors for now */
4803 4804
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4805 4806 4807 4808 4809 4810
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_STATUS_PROC:
    {
4811
      res= sp_show_status_procedure(thd, (lex->wild ?
4812 4813 4814 4815 4816
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4817
      res= sp_show_status_function(thd, (lex->wild ? 
4818 4819 4820
					 lex->wild->ptr() : NullS));
      break;
    }
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4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832
#ifndef DBUG_OFF
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
      sp_head *sp;

      if (lex->spname->m_name.length > NAME_LEN)
      {
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
	goto error;
      }
      if (lex->sql_command == SQLCOM_SHOW_PROC_CODE)
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4833 4834
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
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pem@mysql.com committed
4835
      else
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4836 4837
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
4838
      if (!sp || sp->show_routine_code(thd))
4839 4840
      {
        /* We don't distinguish between errors for now */
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pem@mysql.com committed
4841 4842 4843 4844 4845 4846 4847
        my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
        goto error;
      }
      break;
    }
#endif // ifndef DBUG_OFF
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4848 4849
  case SQLCOM_CREATE_VIEW:
    {
4850 4851 4852
      if (end_active_trans(thd))
        goto error;

4853
      res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
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4854 4855 4856 4857
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
4858 4859 4860
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4861 4862
      /* Conditionally writes to binlog. */
      res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
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VIEW  
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4863 4864
      break;
    }
4865 4866
  case SQLCOM_CREATE_TRIGGER:
  {
4867 4868 4869
    if (end_active_trans(thd))
      goto error;

4870
    /* Conditionally writes to binlog. */
4871 4872 4873
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

    /* We don't care about trigger body after this point */
4874 4875 4876 4877 4878 4879
    delete lex->sphead;
    lex->sphead= 0;
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4880 4881 4882
    if (end_active_trans(thd))
      goto error;

4883
    /* Conditionally writes to binlog. */
4884 4885 4886
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4887
  case SQLCOM_XA_START:
4888 4889
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4890
    {
4891
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4892 4893 4894 4895
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4896
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4897 4898 4899
      send_ok(thd);
      break;
    }
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serg@serg.mylan committed
4900
    if (thd->lex->xa_opt != XA_NONE)
4901 4902 4903 4904
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4905
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4906
    {
4907
      my_error(ER_XAER_RMFAIL, MYF(0),
4908
               xa_state_names[thd->transaction.xid_state.xa_state]);
4909 4910 4911 4912 4913 4914 4915
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4916 4917 4918 4919 4920 4921 4922 4923 4924
    if (xid_cache_search(thd->lex->xid))
    {
      my_error(ER_XAER_DUPID, MYF(0));
      break;
    }
    DBUG_ASSERT(thd->transaction.xid_state.xid.is_null());
    thd->transaction.xid_state.xa_state=XA_ACTIVE;
    thd->transaction.xid_state.xid.set(thd->lex->xid);
    xid_cache_insert(&thd->transaction.xid_state);
4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936
    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
                   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    send_ok(thd);
    break;
  case SQLCOM_XA_END:
    /* fake it */
    if (thd->lex->xa_opt != XA_NONE)
    { // SUSPEND and FOR MIGRATE are not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4937
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
4938
    {
4939
      my_error(ER_XAER_RMFAIL, MYF(0),
4940
               xa_state_names[thd->transaction.xid_state.xa_state]);
4941 4942
      break;
    }
4943
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4944 4945 4946 4947
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
4948
    thd->transaction.xid_state.xa_state=XA_IDLE;
4949 4950 4951
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
4952
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
4953
    {
4954
      my_error(ER_XAER_RMFAIL, MYF(0),
4955
               xa_state_names[thd->transaction.xid_state.xa_state]);
4956 4957
      break;
    }
4958
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4959 4960 4961 4962 4963 4964 4965
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
4966 4967
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
4968 4969
      break;
    }
4970
    thd->transaction.xid_state.xa_state=XA_PREPARED;
4971 4972 4973
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
4974
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4975
    {
4976 4977
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4978
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
4979
      else
4980 4981 4982
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
4983
        send_ok(thd);
4984
      }
4985 4986
      break;
    }
4987
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
monty@mysql.com's avatar
monty@mysql.com committed
4988
        thd->lex->xa_opt == XA_ONE_PHASE)
4989
    {
4990 4991 4992
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
4993 4994 4995
      else
        send_ok(thd);
    }
4996
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
monty@mysql.com's avatar
monty@mysql.com committed
4997
             thd->lex->xa_opt == XA_NONE)
4998
    {
4999 5000 5001
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
5002
        my_error(ER_XAER_RMERR, MYF(0));
5003
      }
5004
      else
5005 5006 5007 5008 5009 5010 5011
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
5012 5013 5014
    }
    else
    {
5015
      my_error(ER_XAER_RMFAIL, MYF(0),
5016
               xa_state_names[thd->transaction.xid_state.xa_state]);
5017 5018 5019 5020
      break;
    }
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
5021 5022
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
5023 5024
    break;
  case SQLCOM_XA_ROLLBACK:
5025
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5026
    {
5027 5028
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
5029
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
5030
      else
5031 5032 5033
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
5034
        send_ok(thd);
5035
      }
5036 5037
      break;
    }
5038 5039
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
5040
    {
5041
      my_error(ER_XAER_RMFAIL, MYF(0),
5042
               xa_state_names[thd->transaction.xid_state.xa_state]);
5043 5044 5045 5046 5047 5048 5049 5050
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
5051 5052
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
5053 5054
    break;
  case SQLCOM_XA_RECOVER:
5055
    res= mysql_xa_recover(thd);
5056 5057
    break;
  default:
5058
#ifndef EMBEDDED_LIBRARY
5059
    DBUG_ASSERT(0);                             /* Impossible */
5060
#endif
5061
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5062 5063
    break;
  }
monty@mysql.com's avatar
monty@mysql.com committed
5064
  thd->proc_info="query end";
5065
  /* Two binlog-related cleanups: */
5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078

  /*
    Reset system variables temporarily modified by SET ONE SHOT.

    Exception: If this is a SET, do nothing. This is to allow
    mysqlbinlog to print many SET commands (in this case we want the
    charset temp setting to live until the real query). This is also
    needed so that SET CHARACTER_SET_CLIENT... does not cancel itself
    immediately.
  */
  if (thd->one_shot_set && lex->sql_command != SQLCOM_SET_OPTION)
    reset_one_shot_variables(thd);

5079
  /*
5080 5081 5082 5083 5084 5085
    The return value for ROW_COUNT() is "implementation dependent" if the
    statement is not DELETE, INSERT or UPDATE, but -1 is what JDBC and ODBC
    wants.

    We do not change the value for a CALL or EXECUTE statement, so the value
    generated by the last called (or executed) statement is preserved.
5086
   */
5087 5088
  if (lex->sql_command != SQLCOM_CALL && lex->sql_command != SQLCOM_EXECUTE &&
      uc_update_queries[lex->sql_command]<2)
5089
    thd->row_count_func= -1;
5090 5091

  goto end;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5092 5093

error:
5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105
  res= TRUE;

end:
  if (need_start_waiting)
  {
    /*
      Release the protection against the global read lock and wake
      everyone, who might want to set a global read lock.
    */
    start_waiting_global_read_lock(thd);
  }
  DBUG_RETURN(res || thd->net.report_error);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5106 5107 5108
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5109
/*
5110
  Check grants for commands which work only with one table.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5111

5112
  SYNOPSIS
5113
    check_single_table_access()
monty@mysql.com's avatar
monty@mysql.com committed
5114
    thd			Thread handler
5115
    privilege		requested privilege
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5116
    all_tables		global table list of query
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5117 5118 5119

  RETURN
    0 - OK
monty@mysql.com's avatar
monty@mysql.com committed
5120
    1 - access denied, error is sent to client
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5121 5122
*/

5123 5124
bool check_single_table_access(THD *thd, ulong privilege, 
                               TABLE_LIST *all_tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5125
{
5126 5127 5128 5129 5130 5131
  Security_context * backup_ctx= thd->security_ctx;

  /* we need to switch to the saved context (if any) */
  if (all_tables->security_ctx)
    thd->security_ctx= all_tables->security_ctx;

5132 5133 5134 5135 5136 5137 5138 5139
  const char *db_name;
  if ((all_tables->view || all_tables->field_translation) &&
      !all_tables->schema_table)
    db_name= all_tables->view_db.str;
  else
    db_name= all_tables->db;

  if (check_access(thd, privilege, db_name,
5140 5141
		   &all_tables->grant.privilege, 0, 0,
                   test(all_tables->schema_table)))
5142
    goto deny;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5143

5144
  /* Show only 1 table for check_grant */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5145
  if (grant_option && check_grant(thd, privilege, all_tables, 0, 1, 0))
5146 5147 5148
    goto deny;

  thd->security_ctx= backup_ctx;
5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174
  return 0;

deny:
  thd->security_ctx= backup_ctx;
  return 1;
}

/*
  Check grants for commands which work only with one table and all other
  tables belonging to subselects or implicitly opened tables.

  SYNOPSIS
    check_one_table_access()
    thd			Thread handler
    privilege		requested privilege
    all_tables		global table list of query

  RETURN
    0 - OK
    1 - access denied, error is sent to client
*/

bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
  if (check_single_table_access (thd,privilege,all_tables))
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5175

5176
  /* Check rights on tables of subselects and implictly opened tables */
5177
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5178
  if ((subselects_tables= all_tables->next_global))
monty@mysql.com's avatar
monty@mysql.com committed
5179
  {
5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191
    /*
      Access rights asked for the first table of a view should be the same
      as for the view
    */
    if (view && subselects_tables->belong_to_view == view)
    {
      if (check_single_table_access (thd, privilege, subselects_tables))
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
        (check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
5192
      return 1;
monty@mysql.com's avatar
monty@mysql.com committed
5193 5194
  }
  return 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5195 5196 5197
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
5198
/****************************************************************************
5199
  Get the user (global) and database privileges for all used tables
5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212

  NOTES
    The idea of EXTRA_ACL is that one will be granted access to the table if
    one has the asked privilege on any column combination of the table; For
    example to be able to check a table one needs to have SELECT privilege on
    any column of the table.

  RETURN
    0  ok
    1  If we can't get the privileges and we don't use table/column grants.

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5213 5214
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5215 5216 5217
****************************************************************************/

bool
5218
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
5219
	     bool dont_check_global_grants, bool no_errors, bool schema_db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5220
{
5221
  Security_context *sctx= thd->security_ctx;
5222 5223
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
5224
  bool  db_is_pattern= test(want_access & GRANT_ACL);
5225 5226
#endif
  ulong dummy;
5227 5228
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
5229
                      db ? db : "", want_access, sctx->master_access));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5230 5231 5232 5233 5234
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

5235
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5236
  {
5237
    DBUG_PRINT("error",("No database"));
5238
    if (!no_errors)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5239 5240
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
5241
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5242 5243
  }

5244 5245 5246 5247 5248
  if (schema_db)
  {
    if (want_access & ~(SELECT_ACL | EXTRA_ACL))
    {
      if (!no_errors)
5249 5250
      {
        const char *db_name= db ? db : thd->db;
5251
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5252 5253
                 sctx->priv_user, sctx->priv_host, db_name);
      }
5254 5255 5256 5257 5258 5259 5260 5261 5262
      DBUG_RETURN(TRUE);
    }
    else
    {
      *save_priv= SELECT_ACL;
      DBUG_RETURN(FALSE);
    }
  }

monty@mysql.com's avatar
monty@mysql.com committed
5263 5264 5265
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
5266
  if ((sctx->master_access & want_access) == want_access)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5267
  {
5268 5269 5270 5271 5272
    /*
      If we don't have a global SELECT privilege, we have to get the database
      specific access rights to be able to handle queries of type
      UPDATE t1 SET a=1 WHERE b > 0
    */
5273 5274
    db_access= sctx->db_access;
    if (!(sctx->master_access & SELECT_ACL) &&
5275
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
5276 5277 5278
      db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                        db_is_pattern);
    *save_priv=sctx->master_access | db_access;
5279
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5280
  }
5281
  if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
5282
      ! db && dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5283
  {						// We can never grant this
5284
    DBUG_PRINT("error",("No possible access"));
5285
    if (!no_errors)
5286
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
5287 5288
               sctx->priv_user,
               sctx->priv_host,
5289 5290 5291
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
5292
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5293 5294 5295
  }

  if (db == any_db)
5296
    DBUG_RETURN(FALSE);				// Allow select on anything
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5297

5298
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
5299 5300
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5301
  else
5302
    db_access= sctx->db_access;
5303
  DBUG_PRINT("info",("db_access: %lu", db_access));
monty@mysql.com's avatar
monty@mysql.com committed
5304
  /* Remove SHOW attribute and access rights we already have */
5305
  want_access &= ~(sctx->master_access | EXTRA_ACL);
5306 5307
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
5308
  db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
5309 5310

  /* grant_option is set if there exists a single table or column grant */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5311
  if (db_access == want_access ||
5312
      (grant_option && !dont_check_global_grants &&
5313
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
5314
    DBUG_RETURN(FALSE);				/* Ok */
5315 5316

  DBUG_PRINT("error",("Access denied"));
5317
  if (!no_errors)
5318
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5319
             sctx->priv_user, sctx->priv_host,
5320 5321 5322
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
5323
  DBUG_RETURN(TRUE);				/* purecov: tested */
monty@mysql.com's avatar
monty@mysql.com committed
5324
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5325 5326 5327
}


5328 5329 5330 5331 5332 5333 5334 5335 5336
/*
  check for global access and give descriptive error message if it fails

  SYNOPSIS
    check_global_access()
    thd			Thread handler
    want_access		Use should have any of these global rights

  WARNING
5337
    One gets access right if one has ANY of the rights in want_access
5338 5339 5340 5341 5342 5343 5344 5345
    This is useful as one in most cases only need one global right,
    but in some case we want to check if the user has SUPER or
    REPL_CLIENT_ACL rights.

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
5346 5347

bool check_global_access(THD *thd, ulong want_access)
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
5348
{
monty@mysql.com's avatar
monty@mysql.com committed
5349 5350 5351
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
5352
  char command[128];
5353
  if ((thd->security_ctx->master_access & want_access))
5354 5355
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
5356
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
5357
  return 1;
monty@mysql.com's avatar
monty@mysql.com committed
5358
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
5359 5360 5361
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
5362
/*
5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382
  Check the privilege for all used tables.

  SYNOPSYS
    check_table_access()
      thd          Thread context
      want_access  Privileges requested
      tables       List of tables to be checked
      no_errors    FALSE/TRUE - report/don't report error to
                   the client (using my_error() call).

  NOTES
    Table privileges are cached in the table list for GRANT checking.
    This functions assumes that table list used and
    thd->lex->query_tables_own_last value correspond to each other
    (the latter should be either 0 or point to next_global member
    of one of elements of this table list).

  RETURN VALUE
    FALSE - OK
    TRUE  - Access denied
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5383 5384
*/

5385
bool
5386
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
5387
		   bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5388
{
5389 5390
  uint found=0;
  ulong found_access=0;
5391 5392
  TABLE_LIST *org_tables= tables;
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
5393
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
5394
  /*
5395 5396 5397
    The check that first_not_own_table is not reached is for the case when
    the given table list refers to the list for prelocking (contains tables
    of other queries). For simple queries first_not_own_table is 0.
5398
  */
5399
  for (; tables != first_not_own_table; tables= tables->next_global)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5400
  {
5401 5402 5403 5404 5405
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

5406
    if (tables->schema_table && 
5407
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
5408 5409 5410
    {
      if (!no_errors)
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5411
                 sctx->priv_user, sctx->priv_host,
5412 5413 5414
                 information_schema_name.str);
      return TRUE;
    }
5415 5416 5417 5418 5419
    /*
       Register access for view underlying table.
       Remove SHOW_VIEW_ACL, because it will be checked during making view
     */
    tables->grant.orig_want_privilege= (want_access & ~SHOW_VIEW_ACL);
5420
    if (tables->derived || tables->schema_table ||
5421
        (tables->table && (int)tables->table->s->tmp_table) ||
5422 5423
        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
5424
      continue;
5425 5426
    thd->security_ctx= sctx;
    if ((sctx->master_access & want_access) ==
5427
        (want_access & ~EXTRA_ACL) &&
5428
	thd->db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5429
      tables->grant.privilege= want_access;
5430
    else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5431 5432 5433 5434 5435
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
5436
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5437
			 0, no_errors, test(tables->schema_table)))
5438
	  goto deny;                            // Access denied
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5439
	found_access=tables->grant.privilege;
5440
	found=1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5441 5442
      }
    }
5443
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5444
			  0, no_errors, test(tables->schema_table)))
5445
      goto deny;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5446
  }
5447
  thd->security_ctx= backup_ctx;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5448
  if (grant_option)
5449
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5450
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5451
  return FALSE;
5452 5453 5454
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
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5455 5456
}

5457

5458
bool
5459 5460
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
5461 5462 5463 5464 5465
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
5466
  tables->table_name= tables->alias= name;
5467
  
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5468 5469 5470 5471 5472 5473 5474
  /*
    The following test is just a shortcut for check_access() (to avoid
    calculating db_access) under the assumption that it's common to
    give persons global right to execute all stored SP (but not
    necessary to create them).
  */
  if ((thd->security_ctx->master_access & want_access) == want_access)
5475 5476
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
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5477
			0, no_errors, 0))
5478 5479
    return TRUE;
  
5480
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5481
  if (grant_option)
5482
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
5483
#endif
5484 5485 5486 5487

  return FALSE;
}

5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502

/*
  Check if the routine has any of the routine privileges

  SYNOPSIS
    check_some_routine_access()
    thd		 Thread handler
    db           Database name
    name         Routine name

  RETURN
    0            ok
    1            error
*/

5503 5504
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
5505 5506
{
  ulong save_priv;
5507
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
5508
    return FALSE;
5509 5510 5511 5512 5513
  /*
    There are no routines in information_schema db. So we can safely
    pass zero to last paramter of check_access function
  */
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1, 0) ||
5514 5515
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
5516
  return check_routine_level_acl(thd, db, name, is_proc);
5517 5518 5519
}


5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544
/*
  Check if the given table has any of the asked privileges

  SYNOPSIS
    check_some_access()
    thd		 Thread handler
    want_access	 Bitmap of possible privileges to check for

  RETURN
    0  ok
    1  error
*/


bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table)
{
  ulong access;
  DBUG_ENTER("check_some_access");

  /* This loop will work as long as we have less than 32 privileges */
  for (access= 1; access < want_access ; access<<= 1)
  {
    if (access & want_access)
    {
      if (!check_access(thd, access, table->db,
5545 5546
                        &table->grant.privilege, 0, 1,
                        test(table->schema_table)) &&
5547 5548 5549 5550 5551 5552 5553 5554 5555
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5556 5557
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5558 5559 5560 5561
{
  int error=0;
  if (table_list)
  {
5562
    /* Check that all tables use the current database */
5563
    TABLE_LIST *tmp;
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VIEW  
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5564
    for (tmp= table_list; tmp; tmp= tmp->next_local)
5565 5566 5567 5568
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5569
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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5570
			     table_list,0);
5571 5572 5573 5574
  }
  return error;
}

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5575 5576 5577

static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
5578
  char *current_db= NULL;
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5579
  for (; tables; tables= tables->next_global)
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5580
  {
5581
    if (tables->db == NULL)
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5582
    {
5583 5584 5585 5586 5587 5588 5589 5590 5591
      /*
        This code never works and should be removed in 5.1.  All tables
        that are added to the list of tables should already have its
        database field initialized properly (see st_lex::add_table_to_list).
      */
      DBUG_ASSERT(0);
      if (thd->copy_db_to(&current_db, 0))
        return TRUE;
      tables->db= current_db;
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5592 5593 5594 5595
    }
  }
  return FALSE;
}
5596

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5597 5598 5599 5600 5601 5602 5603 5604 5605 5606
/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

#if STACK_DIRECTION < 0
#define used_stack(A,B) (long) (A - B)
#else
#define used_stack(A,B) (long) (B - A)
#endif

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5607 5608 5609 5610
#ifndef DBUG_OFF
long max_stack_used;
#endif

5611
#ifndef EMBEDDED_LIBRARY
5612 5613 5614 5615 5616 5617 5618 5619
/*
  Note: The 'buf' parameter is necessary, even if it is unused here.
  - fix_fields functions has a "dummy" buffer large enough for the
    corresponding exec. (Thus we only have to check in fix_fields.)
  - Passing to check_stack_overrun() prevents the compiler from removing it.
 */
bool check_stack_overrun(THD *thd, long margin,
			 char *buf __attribute__((unused)))
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5620 5621
{
  long stack_used;
5622
  DBUG_ASSERT(thd == current_thd);
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5623
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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5624
      (long) (thread_stack - margin))
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5625
  {
5626 5627 5628
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN_NEED_MORE),
            stack_used,thread_stack,margin);
    my_message(ER_STACK_OVERRUN_NEED_MORE,errbuff[0],MYF(0));
5629
    thd->fatal_error();
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5630 5631
    return 1;
  }
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5632 5633 5634
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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5635 5636
  return 0;
}
5637
#endif /* EMBEDDED_LIBRARY */
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5638 5639 5640 5641

#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

5642
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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5643
{
5644
  LEX	*lex= current_thd->lex;
5645
  ulong old_info=0;
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5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671
  if ((uint) *yystacksize >= MY_YACC_MAX)
    return 1;
  if (!lex->yacc_yyvs)
    old_info= *yystacksize;
  *yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
  if (!(lex->yacc_yyvs= (char*)
	my_realloc((gptr) lex->yacc_yyvs,
		   *yystacksize*sizeof(**yyvs),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
      !(lex->yacc_yyss= (char*)
	my_realloc((gptr) lex->yacc_yyss,
		   *yystacksize*sizeof(**yyss),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
    return 1;
  if (old_info)
  {						// Copy old info from stack
    memcpy(lex->yacc_yyss, (gptr) *yyss, old_info*sizeof(**yyss));
    memcpy(lex->yacc_yyvs, (gptr) *yyvs, old_info*sizeof(**yyvs));
  }
  *yyss=(short*) lex->yacc_yyss;
  *yyvs=(YYSTYPE*) lex->yacc_yyvs;
  return 0;
}


/****************************************************************************
5672
  Initialize global thd variables needed for query
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5673 5674
****************************************************************************/

5675
void
5676
mysql_init_query(THD *thd, uchar *buf, uint length)
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bk@work.mysql.com committed
5677 5678
{
  DBUG_ENTER("mysql_init_query");
5679
  lex_start(thd, buf, length);
5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700
  mysql_reset_thd_for_next_command(thd);
  DBUG_VOID_RETURN;
}


/*
 Reset THD part responsible for command processing state.

 DESCRIPTION
   This needs to be called before execution of every statement
   (prepared or conventional).

 TODO
   Make it a method of THD and align its name with the rest of
   reset/end/start/init methods.
   Call it after we use THD for queries, not before.
*/

void mysql_reset_thd_for_next_command(THD *thd)
{
  DBUG_ENTER("mysql_reset_thd_for_next_command");
5701
  thd->free_list= 0;
5702
  thd->select_number= 1;
5703
  thd->query_start_used= thd->insert_id_used=0;
5704
  thd->last_insert_id_used_bin_log= FALSE;
5705
  thd->is_fatal_error= thd->time_zone_used= 0;
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5706
  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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5707 5708
                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
5709
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
5710
  thd->tmp_table_used= 0;
5711 5712
  if (!thd->in_sub_stmt)
  {
5713
    if (opt_bin_log)
5714
    {
5715
      reset_dynamic(&thd->user_var_events);
5716 5717
      thd->user_var_events_alloc= thd->mem_root;
    }
5718
    thd->clear_error();
5719 5720 5721 5722
    thd->total_warn_count=0;			// Warnings for this query
    thd->rand_used= 0;
    thd->sent_row_count= thd->examined_row_count= 0;
  }
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5723 5724 5725
  DBUG_VOID_RETURN;
}

5726

5727 5728 5729
void
mysql_init_select(LEX *lex)
{
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5730
  SELECT_LEX *select_lex= lex->current_select;
5731
  select_lex->init_select();
5732
  lex->wild= 0;
5733 5734
  if (select_lex == &lex->select_lex)
  {
5735
    DBUG_ASSERT(lex->result == 0);
5736 5737
    lex->exchange= 0;
  }
5738 5739
}

5740

5741
bool
5742
mysql_new_select(LEX *lex, bool move_down)
5743
{
5744
  SELECT_LEX *select_lex;
5745
  THD *thd= lex->thd;
5746 5747
  DBUG_ENTER("mysql_new_select");

5748
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
5749
    DBUG_RETURN(1);
5750
  select_lex->select_number= ++thd->select_number;
5751
  select_lex->parent_lex= lex; /* Used in init_query. */
5752 5753
  select_lex->init_query();
  select_lex->init_select();
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5754 5755
  lex->nest_level++;
  select_lex->nest_level= lex->nest_level;
5756 5757 5758 5759 5760
  /*
    Don't evaluate this subquery during statement prepare even if
    it's a constant one. The flag is switched off in the end of
    mysql_stmt_prepare.
  */
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konstantin@mysql.com committed
5761
  if (thd->stmt_arena->is_stmt_prepare())
5762
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
5763 5764
  if (move_down)
  {
5765
    SELECT_LEX_UNIT *unit;
5766
    lex->subqueries= TRUE;
5767
    /* first select_lex of subselect or derived table */
5768
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
5769
      DBUG_RETURN(1);
5770

5771 5772
    unit->init_query();
    unit->init_select();
5773
    unit->thd= thd;
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5774
    unit->include_down(lex->current_select);
5775 5776
    unit->link_next= 0;
    unit->link_prev= 0;
5777
    unit->return_to= lex->current_select;
5778
    select_lex->include_down(unit);
5779 5780 5781 5782 5783
    /*
      By default we assume that it is usual subselect and we have outer name
      resolution context, if no we will assign it to 0 later
    */
    select_lex->context.outer_context= &select_lex->outer_select()->context;
5784 5785
  }
  else
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5786
  {
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VIEW  
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5787 5788
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
5789
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
5790
      DBUG_RETURN(1);
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VIEW  
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5791
    }
5792
    select_lex->include_neighbour(lex->current_select);
5793 5794 5795 5796 5797
    SELECT_LEX_UNIT *unit= select_lex->master_unit();                              
    if (!unit->fake_select_lex && unit->add_fake_select_lex(lex->thd))
      DBUG_RETURN(1);
    select_lex->context.outer_context= 
                unit->first_select()->context.outer_context;
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5798
  }
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5799

5800
  select_lex->master_unit()->global_parameters= select_lex;
5801
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5802
  lex->current_select= select_lex;
5803 5804 5805 5806 5807
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
5808
  DBUG_RETURN(0);
5809
}
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bk@work.mysql.com committed
5810

5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825
/*
  Create a select to return the same output as 'SELECT @@var_name'.

  SYNOPSIS
    create_select_for_variable()
    var_name		Variable name

  DESCRIPTION
    Used for SHOW COUNT(*) [ WARNINGS | ERROR]

    This will crash with a core dump if the variable doesn't exists
*/

void create_select_for_variable(const char *var_name)
{
5826
  THD *thd;
5827
  LEX *lex;
5828
  LEX_STRING tmp, null_lex_string;
5829 5830
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5831
  DBUG_ENTER("create_select_for_variable");
5832 5833

  thd= current_thd;
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pem@mysql.telia.com committed
5834
  lex= thd->lex;
5835 5836 5837 5838
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5839
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5840 5841 5842 5843
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
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5844 5845 5846 5847 5848 5849
  if ((var= get_system_var(thd, OPT_SESSION, tmp, null_lex_string)))
  {
    end= strxmov(buff, "@@session.", var_name, NullS);
    var->set_name(buff, end-buff, system_charset_info);
    add_item_to_list(thd, var);
  }
5850 5851 5852
  DBUG_VOID_RETURN;
}

5853

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monty@hundin.mysql.fi committed
5854 5855
void mysql_init_multi_delete(LEX *lex)
{
5856
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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5857
  mysql_init_select(lex);
5858 5859
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
5860
  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
5861
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
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5862 5863
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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monty@hundin.mysql.fi committed
5864
}
5865

5866 5867 5868 5869
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
5870

5871
void mysql_parse(THD *thd, char *inBuf, uint length)
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bk@work.mysql.com committed
5872 5873
{
  DBUG_ENTER("mysql_parse");
5874 5875 5876

  DBUG_EXECUTE_IF("parser_debug", turn_parser_debug_on(););

5877
  mysql_init_query(thd, (uchar*) inBuf, length);
5878
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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monty@hundin.mysql.fi committed
5879
  {
5880
    LEX *lex= thd->lex;
5881
    
5882 5883
    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
5884
    
5885
    if (!MYSQLparse((void *)thd) && ! thd->is_fatal_error)
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monty@hundin.mysql.fi committed
5886
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
5887
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5888
      if (mqh_used && thd->user_connect &&
5889
	  check_mqh(thd, lex->sql_command))
5890 5891 5892 5893
      {
	thd->net.error = 0;
      }
      else
hf@deer.(none)'s avatar
hf@deer.(none) committed
5894
#endif
5895
      {
5896
	if (thd->net.report_error)
5897 5898
	{
	  if (thd->lex->sphead)
5899 5900 5901 5902
	  {
	    delete thd->lex->sphead;
	    thd->lex->sphead= NULL;
	  }
5903
	}
5904 5905
	else
	{
5906 5907 5908 5909 5910 5911 5912 5913 5914 5915
          /*
            Binlog logs a string starting from thd->query and having length
            thd->query_length; so we set thd->query_length correctly (to not
            log several statements in one event, when we executed only first).
            We set it to not see the ';' (otherwise it would get into binlog
            and Query_log_event::print() would give ';;' output).
            This also helps display only the current query in SHOW
            PROCESSLIST.
            Note that we don't need LOCK_thread_count to modify query_length.
          */
serg@serg.mylan's avatar
serg@serg.mylan committed
5916 5917
          if (lex->found_semicolon &&
              (thd->query_length= (ulong)(lex->found_semicolon - thd->query)))
5918 5919
            thd->query_length--;
          /* Actually execute the query */
5920
	  mysql_execute_command(thd);
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
5921
	  query_cache_end_of_result(thd);
5922
	}
5923
      }
5924
      lex->unit.cleanup();
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monty@hundin.mysql.fi committed
5925 5926
    }
    else
5927
    {
5928
      DBUG_ASSERT(thd->net.report_error);
5929
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5930
			 thd->is_fatal_error));
5931 5932 5933 5934 5935

      /*
        The first thing we do after parse error is freeing sp_head to
        ensure that we have restored original memroot.
      */
5936
      if (thd->lex->sphead)
5937
      {
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monty@mysql.com committed
5938
	/* Clean up after failed stored procedure/function */
5939 5940 5941
	delete thd->lex->sphead;
	thd->lex->sphead= NULL;
      }
5942 5943
      query_cache_abort(&thd->net);
      lex->unit.cleanup();
5944
    }
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monty@hundin.mysql.fi committed
5945
    thd->proc_info="freeing items";
5946
    thd->end_statement();
5947
    thd->cleanup_after_query();
5948
    DBUG_ASSERT(thd->change_list.is_empty());
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monty@hundin.mysql.fi committed
5949
  }
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bk@work.mysql.com committed
5950 5951 5952 5953
  DBUG_VOID_RETURN;
}


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5954
#ifdef HAVE_REPLICATION
5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965
/*
  Usable by the replication SQL thread only: just parse a query to know if it
  can be ignored because of replicate-*-table rules.

  RETURN VALUES
    0	cannot be ignored
    1	can be ignored
*/

bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
5966
  LEX *lex= thd->lex;
5967
  bool error= 0;
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5968
  DBUG_ENTER("mysql_test_parse_for_slave");
5969

5970
  mysql_init_query(thd, (uchar*) inBuf, length);
5971
  if (!MYSQLparse((void*) thd) && ! thd->is_fatal_error &&
5972
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
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5973
    error= 1;                  /* Ignore question */
5974
  thd->end_statement();
5975
  thd->cleanup_after_query();
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5976
  DBUG_RETURN(error);
5977
}
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5978
#endif
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5979

5980

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5981

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5982 5983 5984 5985 5986
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

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5987
bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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		       char *length, char *decimals,
5989
		       uint type_modifier,
5990 5991
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
5992 5993
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
5994
		       uint uint_geom_type)
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{
  register create_field *new_field;
5997
  LEX  *lex= thd->lex;
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
6002
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name); /* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
6008 6009 6010
    lex->alter_info.key_list.push_back(new Key(Key::PRIMARY, NullS,
                                               HA_KEY_ALG_UNDEF, 0,
                                               lex->col_list));
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    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
6016 6017 6018
    lex->alter_info.key_list.push_back(new Key(Key::UNIQUE, NullS,
                                               HA_KEY_ALG_UNDEF, 0,
                                               lex->col_list));
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    lex->col_list.empty();
  }

6022
  if (default_value)
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6023
  {
6024
    /* 
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bell@sanja.is.com.ua committed
6025 6026
      Default value should be literal => basic constants =>
      no need fix_fields()
6027 6028 6029
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
6030
    */
6031 6032 6033
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
6034
    {
6035
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
6036 6037 6038
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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6039
    {
6040
      default_value= 0;
6041 6042 6043
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
6044
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
6045 6046 6047 6048 6049
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
6050
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
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6051 6052 6053
      DBUG_RETURN(1);
    }
  }
6054 6055 6056

  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
6057
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name);
6058 6059
    DBUG_RETURN(1);
  }
6060

6061 6062 6063 6064 6065 6066
  if (type == FIELD_TYPE_TIMESTAMP && length)
  {
    /* Display widths are no longer supported for TIMSTAMP as of MySQL 4.1.
       In other words, for declarations such as TIMESTAMP(2), TIMESTAMP(4),
       and so on, the display width is ignored.
    */
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6067
    char buf[32];
6068
    my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
6069 6070 6071
    push_warning_printf(thd,MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_WARN_DEPRECATED_SYNTAX,
                        ER(ER_WARN_DEPRECATED_SYNTAX),
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6072
                        buf, "TIMESTAMP");
6073 6074
  }

6075 6076 6077 6078
  if (!(new_field= new create_field()) ||
      new_field->init(thd, field_name, type, length, decimals, type_modifier,
                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
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6079
    DBUG_RETURN(1);
6080

6081
  lex->alter_info.create_list.push_back(new_field);
6082 6083 6084 6085
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

6086

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6087 6088 6089 6090
/* Store position for column in ALTER TABLE .. ADD column */

void store_position_for_column(const char *name)
{
6091
  current_thd->lex->last_field->after=my_const_cast(char*) (name);
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}

bool
6095
add_proc_to_list(THD* thd, Item *item)
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{
  ORDER *order;
  Item	**item_ptr;

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6100
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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6101 6102 6103 6104 6105
    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
6106
  thd->lex->proc_list.link_in_list((byte*) order,(byte**) &order->next);
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6107 6108 6109 6110 6111 6112 6113 6114
  return 0;
}


/* Fix escaping of _, % and \ in database and table names (for ODBC) */

static void remove_escape(char *name)
{
6115 6116
  if (!*name)					// For empty DB names
    return;
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6117 6118
  char *to;
#ifdef USE_MB
6119
  char *strend=name+(uint) strlen(name);
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6120 6121 6122 6123 6124
#endif
  for (to=name; *name ; name++)
  {
#ifdef USE_MB
    int l;
6125 6126
    if (use_mb(system_charset_info) &&
        (l = my_ismbchar(system_charset_info, name, strend)))
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6127 6128 6129 6130 6131 6132 6133 6134
    {
	while (l--)
	    *to++ = *name++;
	name--;
	continue;
    }
#endif
    if (*name == '\\' && name[1])
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6135
      name++;					// Skip '\\'
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    *to++= *name;
  }
  *to=0;
}

/****************************************************************************
** save order by and tables in own lists
****************************************************************************/


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6146
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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6147 6148 6149
{
  ORDER *order;
  DBUG_ENTER("add_to_list");
6150
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
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6151
    DBUG_RETURN(1);
6152 6153
  order->item_ptr= item;
  order->item= &order->item_ptr;
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6154 6155 6156
  order->asc = asc;
  order->free_me=0;
  order->used=0;
6157
  order->counter_used= 0;
6158
  list.link_in_list((byte*) order,(byte**) &order->next);
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6159 6160 6161 6162
  DBUG_RETURN(0);
}


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6163 6164 6165 6166 6167 6168 6169 6170 6171 6172
/*
  Add a table to list of used tables

  SYNOPSIS
    add_table_to_list()
    table		Table to add
    alias		alias for table (or null if no alias)
    table_options	A set of the following bits:
			TL_OPTION_UPDATING	Table will be updated
			TL_OPTION_FORCE_INDEX	Force usage of index
6173
			TL_OPTION_ALIAS	        an alias in multi table DELETE
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6174 6175 6176 6177 6178 6179 6180 6181 6182
    lock_type		How table should be locked
    use_index		List of indexed used in USE INDEX
    ignore_index	List of indexed used in IGNORE INDEX

    RETURN
      0		Error
      #		Pointer to TABLE_LIST element added to the total table list
*/

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6183 6184
TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
6185
					     LEX_STRING *alias,
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6186 6187
					     ulong table_options,
					     thr_lock_type lock_type,
6188 6189
					     List<String> *use_index_arg,
					     List<String> *ignore_index_arg,
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6190
                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
6193
  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
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6194
  char *alias_str;
6195
  LEX *lex= thd->lex;
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6196
  DBUG_ENTER("add_table_to_list");
6197
  LINT_INIT(previous_table_ref);
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6198 6199 6200 6201

  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
6202 6203
  if (!test(table_options & TL_OPTION_ALIAS) && 
      check_table_name(table->table.str, table->table.length))
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6204
  {
6205
    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
6210 6211 6212
  {
    if (table->sel)
    {
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6213 6214
      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
6215 6216
      DBUG_RETURN(0);
    }
6217
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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6218
      DBUG_RETURN(0);
6219
  }
6220
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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6221
    DBUG_RETURN(0);				/* purecov: inspected */
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6222
  if (table->db.str)
6223
  {
6224 6225 6226 6227 6228
    if (table->is_derived_table() == FALSE && check_db_name(table->db.str))
    {
      my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
      DBUG_RETURN(0);
    }
6229 6230 6231
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
6232 6233
  else if (thd->copy_db_to(&ptr->db, &ptr->db_length))
    DBUG_RETURN(0);
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6234

6235
  ptr->alias= alias_str;
6236
  if (lower_case_table_names && table->table.length)
6237
    table->table.length= my_casedn_str(files_charset_info, table->table.str);
6238 6239
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
6240
  ptr->lock_type=   lock_type;
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6241 6242
  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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6243
  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
6244
  ptr->derived=	    table->sel;
6245 6246
  if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db,
                                      information_schema_name.str))
6247
  {
6248
    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
6249 6250 6251
    if (!schema_table ||
        (schema_table->hidden && 
         lex->orig_sql_command == SQLCOM_END))  // not a 'show' command
6252
    {
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6253
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6254
               ptr->table_name, information_schema_name.str);
6255 6256
      DBUG_RETURN(0);
    }
6257
    ptr->schema_table_name= ptr->table_name;
6258 6259
    ptr->schema_table= schema_table;
  }
6260
  ptr->select_lex=  lex->current_select;
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6261
  ptr->cacheable_table= 1;
6262 6263 6264 6265 6266 6267
  if (use_index_arg)
    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index_arg,
						sizeof(*use_index_arg));
  if (ignore_index_arg)
    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index_arg,
						   sizeof(*ignore_index_arg));
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6268
  ptr->option= option ? option->str : 0;
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6269
  /* check that used name is unique */
6270
  if (lock_type != TL_IGNORE)
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6271
  {
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6272 6273 6274 6275
    TABLE_LIST *first_table= (TABLE_LIST*) table_list.first;
    if (lex->sql_command == SQLCOM_CREATE_VIEW)
      first_table= first_table ? first_table->next_local : NULL;
    for (TABLE_LIST *tables= first_table ;
6276
	 tables ;
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VIEW  
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6277
	 tables=tables->next_local)
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6278
    {
6279 6280
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
6281
      {
6282
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
6283 6284
	DBUG_RETURN(0);				/* purecov: tested */
      }
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6285 6286
    }
  }
6287 6288 6289
  /* Store the table reference preceding the current one. */
  if (table_list.elements > 0)
  {
6290 6291 6292
    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
6293
      We don't use the offsetof() macro here to avoid warnings from gcc
6294
    */
6295 6296 6297
    previous_table_ref= (TABLE_LIST*) ((char*) table_list.next -
                                       ((char*) &(ptr->next_local) -
                                        (char*) ptr));
6298 6299 6300 6301 6302 6303 6304 6305
    /*
      Set next_name_resolution_table of the previous table reference to point
      to the current table reference. In effect the list
      TABLE_LIST::next_name_resolution_table coincides with
      TABLE_LIST::next_local. Later this may be changed in
      store_top_level_join_columns() for NATURAL/USING joins.
    */
    previous_table_ref->next_name_resolution_table= ptr;
6306
  }
6307

6308 6309 6310 6311 6312 6313
  /*
    Link the current table reference in a local list (list for current select).
    Notice that as a side effect here we set the next_local field of the
    previous table reference to 'ptr'. Here we also add one element to the
    list 'table_list'.
  */
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6314
  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
6315
  ptr->next_name_resolution_table= NULL;
6316
  /* Link table in global list (all used tables) */
6317
  lex->add_to_query_tables(ptr);
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6318 6319 6320
  DBUG_RETURN(ptr);
}

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6321

6322 6323 6324 6325
/*
  Initialize a new table list for a nested join

  SYNOPSIS
6326
    init_nested_join()
6327
    thd         current thread
6328

6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347
  DESCRIPTION
    The function initializes a structure of the TABLE_LIST type
    for a nested join. It sets up its nested join list as empty.
    The created structure is added to the front of the current
    join list in the st_select_lex object. Then the function
    changes the current nest level for joins to refer to the newly
    created empty list after having saved the info on the old level
    in the initialized structure.

  RETURN VALUE
    0,  if success
    1,  otherwise
*/

bool st_select_lex::init_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
  DBUG_ENTER("init_nested_join");
6348

6349 6350
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6351
    DBUG_RETURN(1);
6352 6353 6354
  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374
  join_list->push_front(ptr);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
  embedding= ptr;
  join_list= &nested_join->join_list;
  join_list->empty();
  DBUG_RETURN(0);
}


/*
  End a nested join table list

  SYNOPSIS
    end_nested_join()
    thd         current thread

  DESCRIPTION
    The function returns to the previous join nest level.
    If the current level contains only one member, the function
6375
    moves it one level up, eliminating the nest.
6376 6377 6378 6379 6380 6381 6382 6383 6384

  RETURN VALUE
    Pointer to TABLE_LIST element added to the total table list, if success
    0, otherwise
*/

TABLE_LIST *st_select_lex::end_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
6385
  NESTED_JOIN *nested_join;
6386
  DBUG_ENTER("end_nested_join");
6387

6388
  DBUG_ASSERT(embedding);
6389 6390 6391
  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
6392
  nested_join= ptr->nested_join;
6393 6394 6395 6396 6397 6398 6399 6400 6401
  if (nested_join->join_list.elements == 1)
  {
    TABLE_LIST *embedded= nested_join->join_list.head();
    join_list->pop();
    embedded->join_list= join_list;
    embedded->embedding= embedding;
    join_list->push_front(embedded);
    ptr= embedded;
  }
6402
  else if (nested_join->join_list.elements == 0)
6403 6404
  {
    join_list->pop();
6405
    ptr= 0;                                     // return value
6406
  }
6407 6408 6409 6410 6411 6412 6413 6414
  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
6415
    nest_last_join()
6416 6417 6418 6419 6420 6421
    thd         current thread

  DESCRIPTION
    The function nest last join operation as if it was enclosed in braces.

  RETURN VALUE
6422 6423 6424
    0  Error
    #  Pointer to TABLE_LIST element created for the new nested join

6425 6426 6427 6428 6429 6430
*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
6431
  List<TABLE_LIST> *embedded_list;
6432
  DBUG_ENTER("nest_last_join");
6433

6434 6435
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6436
    DBUG_RETURN(0);
6437 6438 6439
  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

6440 6441
  ptr->embedding= embedding;
  ptr->join_list= join_list;
6442
  embedded_list= &nested_join->join_list;
6443
  embedded_list->empty();
6444 6445

  for (uint i=0; i < 2; i++)
6446 6447 6448 6449 6450
  {
    TABLE_LIST *table= join_list->pop();
    table->join_list= embedded_list;
    table->embedding= ptr;
    embedded_list->push_back(table);
6451 6452 6453 6454 6455 6456 6457
    if (table->natural_join)
    {
      ptr->is_natural_join= TRUE;
      /*
        If this is a JOIN ... USING, move the list of joined fields to the
        table reference that describes the join.
      */
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      if (prev_join_using)
        ptr->join_using_fields= prev_join_using;
6460
    }
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  }
  join_list->push_front(ptr);
  nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
  DBUG_RETURN(ptr);
}


/*
  Add a table to the current join list

  SYNOPSIS
    add_joined_table()
    table       the table to add

  DESCRIPTION
    The function puts a table in front of the current join list
    of st_select_lex object.
    Thus, joined tables are put into this list in the reverse order
    (the most outer join operation follows first).

  RETURN VALUE
    None
*/

void st_select_lex::add_joined_table(TABLE_LIST *table)
{
  DBUG_ENTER("add_joined_table");
  join_list->push_front(table);
  table->join_list= join_list;
  table->embedding= embedding;
  DBUG_VOID_RETURN;
}


/*
  Convert a right join into equivalent left join

  SYNOPSIS
    convert_right_join()
    thd         current thread
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  DESCRIPTION
    The function takes the current join list t[0],t[1] ... and
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    effectively converts it into the list t[1],t[0] ...
    Although the outer_join flag for the new nested table contains
    JOIN_TYPE_RIGHT, it will be handled as the inner table of a left join
    operation.

  EXAMPLES
    SELECT * FROM t1 RIGHT JOIN t2 ON on_expr =>
      SELECT * FROM t2 LEFT JOIN t1 ON on_expr

    SELECT * FROM t1,t2 RIGHT JOIN t3 ON on_expr =>
      SELECT * FROM t1,t3 LEFT JOIN t2 ON on_expr

    SELECT * FROM t1,t2 RIGHT JOIN (t3,t4) ON on_expr =>
      SELECT * FROM t1,(t3,t4) LEFT JOIN t2 ON on_expr

    SELECT * FROM t1 LEFT JOIN t2 ON on_expr1 RIGHT JOIN t3  ON on_expr2 =>
      SELECT * FROM t3 LEFT JOIN (t1 LEFT JOIN t2 ON on_expr2) ON on_expr1

  RETURN
    Pointer to the table representing the inner table, if success
    0, otherwise
*/

6527
TABLE_LIST *st_select_lex::convert_right_join()
6528 6529
{
  TABLE_LIST *tab2= join_list->pop();
6530
  TABLE_LIST *tab1= join_list->pop();
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  DBUG_ENTER("convert_right_join");

  join_list->push_front(tab2);
  join_list->push_front(tab1);
  tab1->outer_join|= JOIN_TYPE_RIGHT;

  DBUG_RETURN(tab1);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

  NOTE:
    If lock is a write lock, then tables->updating is set 1
    This is to get tables_ok to know that the table is updated by the
    query
*/

6553
void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
6554 6555 6556 6557 6558 6559
{
  bool for_update= lock_type >= TL_READ_NO_INSERT;
  DBUG_ENTER("set_lock_for_tables");
  DBUG_PRINT("enter", ("lock_type: %d  for_update: %d", lock_type,
		       for_update));

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  for (TABLE_LIST *tables= (TABLE_LIST*) table_list.first;
       tables;
       tables= tables->next_local)
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  {
    tables->lock_type= lock_type;
    tables->updating=  for_update;
  }
  DBUG_VOID_RETURN;
}

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6570

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/*
  Create a fake SELECT_LEX for a unit

  SYNOPSIS:
    add_fake_select_lex()
    thd			   thread handle

  DESCRIPTION
    The method create a fake SELECT_LEX object for a unit.
    This object is created for any union construct containing a union
    operation and also for any single select union construct of the form
    (SELECT ... ORDER BY order_list [LIMIT n]) ORDER BY ... 
    or of the form
    (SELECT ... ORDER BY LIMIT n) ORDER BY ...
  
  NOTES
    The object is used to retrieve rows from the temporary table
    where the result on the union is obtained.

  RETURN VALUES
    1     on failure to create the object
    0     on success
*/

bool st_select_lex_unit::add_fake_select_lex(THD *thd)
{
  SELECT_LEX *first_sl= first_select();
  DBUG_ENTER("add_fake_select_lex");
  DBUG_ASSERT(!fake_select_lex);
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6600

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  if (!(fake_select_lex= new (thd->mem_root) SELECT_LEX()))
      DBUG_RETURN(1);
  fake_select_lex->include_standalone(this, 
                                      (SELECT_LEX_NODE**)&fake_select_lex);
  fake_select_lex->select_number= INT_MAX;
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  fake_select_lex->parent_lex= thd->lex; /* Used in init_query. */
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  fake_select_lex->make_empty_select();
  fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE;
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  fake_select_lex->select_limit= 0;

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6611
  fake_select_lex->context.outer_context=first_sl->context.outer_context;
6612 6613 6614
  /* allow item list resolving in fake select for ORDER BY */
  fake_select_lex->context.resolve_in_select_list= TRUE;
  fake_select_lex->context.select_lex= fake_select_lex;
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  if (!first_sl->next_select())
  {
    /* 
      This works only for 
      (SELECT ... ORDER BY list [LIMIT n]) ORDER BY order_list [LIMIT m],
      (SELECT ... LIMIT n) ORDER BY order_list [LIMIT m]
      just before the parser starts processing order_list
    */ 
    global_parameters= fake_select_lex;
    fake_select_lex->no_table_names_allowed= 1;
    thd->lex->current_select= fake_select_lex;
  }
6628
  thd->lex->pop_context();
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  DBUG_RETURN(0);
}

6632

6633
/*
6634 6635
  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
6636 6637

  SYNOPSIS
6638
    push_new_name_resolution_context()
6639
    thd       pointer to current thread
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6640
    left_op   left  operand of the JOIN
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    right_op  rigth operand of the JOIN

  DESCRIPTION
    Create a new name resolution context for a JOIN ... ON clause,
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    set the first and last leaves of the list of table references
    to be used for name resolution, and push the newly created
    context to the stack of contexts of the query.
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  RETURN
6650 6651
    FALSE  if all is OK
    TRUE   if a memory allocation error occured
6652 6653
*/

6654 6655 6656
bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
6657 6658
{
  Name_resolution_context *on_context;
6659
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
6660
    return TRUE;
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  on_context->init();
  on_context->first_name_resolution_table=
    left_op->first_leaf_for_name_resolution();
  on_context->last_name_resolution_table=
    right_op->last_leaf_for_name_resolution();
6666
  return thd->lex->push_context(on_context);
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}


/*
  Add an ON condition to the second operand of a JOIN ... ON.

  SYNOPSIS
    add_join_on
    b     the second operand of a JOIN ... ON
    expr  the condition to be added to the ON clause

  DESCRIPTION
    Add an ON condition to the right operand of a JOIN ... ON clause.

  RETURN
    FALSE  if there was some error
    TRUE   if all is OK
*/

void add_join_on(TABLE_LIST *b, Item *expr)
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{
6688
  if (expr)
6689
  {
6690
    if (!b->on_expr)
6691
      b->on_expr= expr;
6692 6693
    else
    {
6694 6695 6696 6697 6698 6699
      /*
        If called from the parser, this happens if you have both a
        right and left join. If called later, it happens if we add more
        than one condition to the ON clause.
      */
      b->on_expr= new Item_cond_and(b->on_expr,expr);
6700 6701
    }
    b->on_expr->top_level_item();
6702
  }
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}


6706
/*
6707 6708
  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6709 6710 6711

  SYNOPSIS
    add_join_natural()
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    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
6715
    lex                 The current st_select_lex
6716
  
6717
  IMPLEMENTATION
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    This function marks that table b should be joined with a either via
    a NATURAL JOIN or via JOIN ... USING. Both join types are special
    cases of each other, so we treat them together. The function
    setup_conds() creates a list of equal condition between all fields
    of the same name for NATURAL JOIN or the fields in 'using_fields'
    for JOIN ... USING. The list of equality conditions is stored
    either in b->on_expr, or in JOIN::conds, depending on whether there
    was an outer join.

  EXAMPLE
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    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
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    SELECT * FROM t1 NATURAL JOIN t2 WHERE <some_cond>
     <=>
    SELECT * FROM t1, t2 WHERE (t1.i=t2.i and t1.j=t2.j and <some_cond>)

    SELECT * FROM t1 JOIN t2 USING(j) WHERE <some_cond>
     <=>
    SELECT * FROM t1, t2 WHERE (t1.j=t2.j and <some_cond>)

  RETURN
    None
6742 6743
*/

6744 6745
void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields,
                      SELECT_LEX *lex)
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6746
{
6747
  b->natural_join= a;
6748
  lex->prev_join_using= using_fields;
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}

6751

6752
/*
6753 6754 6755 6756
  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
6757
    thd			Thread handler (can be NULL!)
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    options             What should be reset/reloaded (tables, privileges,
    slave...)
    tables              Tables to flush (if any)
    write_to_binlog     Depending on 'options', it may be very bad to write the
                        query to the binlog (e.g. FLUSH SLAVE); this is a
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                        pointer where reload_acl_and_cache() will put 0 if
                        it thinks we really should not write to the binlog.
                        Otherwise it will put 1.
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  RETURN
    0	 ok
6769
    !=0  error.  thd->killed or thd->net.report_error is set
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*/

6772 6773
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
6777
  bool tmp_write_to_binlog= 1;
6778

6779
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6780

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    THD *tmp_thd= 0;
    /*
      If reload_acl_and_cache() is called from SIGHUP handler we have to
      allocate temporary THD for execution of acl_reload()/grant_reload().
    */
    if (!thd && (thd= (tmp_thd= new THD)))
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    {
      thd->thread_stack= (char*) &tmp_thd;
6792
      thd->store_globals();
6793
    }
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    if (thd)
    {
      (void)acl_reload(thd);
      (void)grant_reload(thd);
    }
    if (tmp_thd)
    {
      delete tmp_thd;
      /* Remember that we don't have a THD */
      my_pthread_setspecific_ptr(THR_THD,  0);
      thd= 0;
    }
6806
    reset_mqh((LEX_USER *)NULL, TRUE);
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6807
  }
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#endif
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6809 6810
  if (options & REFRESH_LOG)
  {
6811
    /*
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      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
6814
    */
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6815

6816
    /*
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6817 6818 6819 6820
      Writing this command to the binlog may result in infinite loops
      when doing mysqlbinlog|mysql, and anyway it does not really make
      sense to log it automatically (would cause more trouble to users
      than it would help them)
6821 6822
    */
    tmp_write_to_binlog= 0;
6823 6824
    mysql_log.new_file(1);
    mysql_slow_log.new_file(1);
6825 6826 6827 6828
    if( mysql_bin_log.is_open() )
    {
      mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
    }
6829
#ifdef HAVE_REPLICATION
6830
    pthread_mutex_lock(&LOCK_active_mi);
6831
    rotate_relay_log(active_mi);
6832
    pthread_mutex_unlock(&LOCK_active_mi);
6833
#endif
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6834 6835
    if (ha_flush_logs())
      result=1;
6836 6837
    if (flush_error_log())
      result=1;
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6838
  }
6839
#ifdef HAVE_QUERY_CACHE
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6840 6841
  if (options & REFRESH_QUERY_CACHE_FREE)
  {
6842
    query_cache.pack();				// FLUSH QUERY CACHE
6843
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
6847
    query_cache.flush();			// RESET QUERY CACHE
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monty@hundin.mysql.fi committed
6848
  }
6849
#endif /*HAVE_QUERY_CACHE*/
6850 6851 6852 6853 6854
  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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bk@work.mysql.com committed
6855
  {
6856
    if ((options & REFRESH_READ_LOCK) && thd)
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6857
    {
6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868
      /*
        We must not try to aspire a global read lock if we have a write
        locked table. This would lead to a deadlock when trying to
        reopen (and re-lock) the table after the flush.
      */
      if (thd->locked_tables)
      {
        THR_LOCK_DATA **lock_p= thd->locked_tables->locks;
        THR_LOCK_DATA **end_p= lock_p + thd->locked_tables->lock_count;

        for (; lock_p < end_p; lock_p++)
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6869
        {
6870 6871 6872 6873 6874
          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
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6875
        }
6876
      }
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6881
      tmp_write_to_binlog= 0;
6882
      if (lock_global_read_lock(thd))
6883
	return 1;                               // Killed
6884 6885
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
6886
      if (make_global_read_lock_block_commit(thd)) // Killed
6887 6888 6889 6890 6891
      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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6892
    }
6893 6894
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
6895
    my_dbopt_cleanup();
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
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6899
  if (thd && (options & REFRESH_STATUS))
6900
    refresh_status(thd);
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  if (options & REFRESH_THREADS)
    flush_thread_cache();
6903
#ifdef HAVE_REPLICATION
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6904
  if (options & REFRESH_MASTER)
6905
  {
6906
    DBUG_ASSERT(thd);
6907
    tmp_write_to_binlog= 0;
6908
    if (reset_master(thd))
6909
    {
6910
      result=1;
6911 6912
      thd->fatal_error();                       // Ensure client get error
    }
6913
  }
6914
#endif
6915
#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
6922
#ifdef HAVE_REPLICATION
6923 6924
 if (options & REFRESH_SLAVE)
 {
6925
   tmp_write_to_binlog= 0;
6926
   pthread_mutex_lock(&LOCK_active_mi);
6927
   if (reset_slave(thd, active_mi))
6928
     result=1;
6929
   pthread_mutex_unlock(&LOCK_active_mi);
6930
 }
6931
#endif
6932
 if (options & REFRESH_USER_RESOURCES)
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6933
   reset_mqh((LEX_USER *) NULL);
6934
 *write_to_binlog= tmp_write_to_binlog;
6935
 return result;
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6936 6937
}

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/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

  NOTES
    This is written such that we have a short lock on LOCK_thread_count
*/

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6950
void kill_one_thread(THD *thd, ulong id, bool only_kill_query)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
6954 6955
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
6960 6961
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
6965 6966
  if (tmp)
  {
6967 6968
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
	!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
6969
    {
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      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
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      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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  if (!error)
6979
    send_ok(thd);
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  else
6981
    my_error(error, MYF(0), id);
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}

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6984

6985 6986
	/* If pointer is not a null pointer, append filename to it */

6987 6988
static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name)
6989
{
6990
  char buff[FN_REFLEN],*ptr, *end;
6991 6992 6993 6994 6995 6996 6997
  if (!*filename_ptr)
    return 0;					// nothing to do

  /* Check that the filename is not too long and it's a hard path */
  if (strlen(*filename_ptr)+strlen(table_name) >= FN_REFLEN-1 ||
      !test_if_hard_path(*filename_ptr))
  {
6998
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
6999 7000 7001 7002
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
7003
  end=convert_dirname(buff, *filename_ptr, NullS);
7004
  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
7005 7006
    return 1;					// End of memory
  *filename_ptr=ptr;
7007
  strxmov(ptr,buff,table_name,NullS);
7008 7009
  return 0;
}
7010

7011

7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7024 7025
/*
  Check if the select is a simple select (not an union)

  SYNOPSIS
    check_simple_select()

  RETURN VALUES
    0	ok
    1	error	; In this case the error messege is sent to the client
*/

bool check_simple_select()
{
  THD *thd= current_thd;
7026 7027
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
7028 7029
  {
    char command[80];
7030 7031
    strmake(command, lex->yylval->symbol.str,
	    min(lex->yylval->symbol.length, sizeof(command)-1));
7032
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
7033 7034 7035 7036
    return 1;
  }
  return 0;
}
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7037

7038

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7039
Comp_creator *comp_eq_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7040
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7041
  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7042 7043
}

7044

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7045
Comp_creator *comp_ge_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7046
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7047
  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7048 7049
}

7050

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7051
Comp_creator *comp_gt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7052
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7053
  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7054 7055
}

7056

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7057
Comp_creator *comp_le_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7058
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7059
  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7060 7061
}

7062

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7063
Comp_creator *comp_lt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7064
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7065
  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7066 7067
}

7068

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7069
Comp_creator *comp_ne_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7070
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7071
  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7072
}
7073 7074 7075 7076 7077 7078 7079 7080 7081 7082 7083 7084 7085 7086 7087 7088 7089 7090 7091 7092


/*
  Construct ALL/ANY/SOME subquery Item

  SYNOPSIS
    all_any_subquery_creator()
    left_expr - pointer to left expression
    cmp - compare function creator
    all - true if we create ALL subquery
    select_lex - pointer on parsed subquery structure

  RETURN VALUE
    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
serg@serg.mylan's avatar
serg@serg.mylan committed
7093
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
7094
    return new Item_in_subselect(left_expr, select_lex);
serg@serg.mylan's avatar
serg@serg.mylan committed
7095 7096

  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
7097 7098 7099
    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
7100
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
7101
  if (all)
7102
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
7103

7104
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
7105
}
7106 7107 7108 7109 7110 7111 7112


/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
7113
    thd		Thread handler
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7114
    tables	Global/local table list (have to be the same)
7115

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7116
  RETURN VALUE
7117 7118
    FALSE OK
    TRUE  Error
7119
*/
7120

7121
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
7122 7123 7124 7125 7126
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7127
  DBUG_ENTER("multi_update_precheck");
7128 7129 7130

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
7131
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7132
    DBUG_RETURN(TRUE);
7133 7134 7135 7136 7137
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7138
  for (table= tables; table; table= table->next_local)
7139
  {
7140 7141 7142
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
7143 7144
                           &table->grant.privilege, 0, 1,
                           test(table->schema_table)) ||
7145 7146
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
monty@mysql.com's avatar
monty@mysql.com committed
7147
             (check_access(thd, SELECT_ACL, table->db,
7148 7149
                           &table->grant.privilege, 0, 0,
                           test(table->schema_table)) ||
monty@mysql.com's avatar
monty@mysql.com committed
7150
              grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
7151
      DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7152

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7153
    table->table_in_first_from_clause= 1;
7154
  }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7155 7156 7157
  /*
    Is there tables of subqueries?
  */
7158
  if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used)
7159
  {
7160
    DBUG_PRINT("info",("Checking sub query list"));
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7161
    for (table= tables; table; table= table->next_global)
7162
    {
monty@mysql.com's avatar
monty@mysql.com committed
7163 7164 7165
      if (!my_tz_check_n_skip_implicit_tables(&table,
                                              lex->time_zone_tables_used) &&
          !table->table_in_first_from_clause)
7166 7167
      {
	if (check_access(thd, SELECT_ACL, table->db,
7168 7169
			 &table->grant.privilege, 0, 0,
                         test(table->schema_table)) ||
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7170
	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
7171
	  DBUG_RETURN(TRUE);
7172 7173 7174 7175 7176 7177
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
7178
  else if (select_lex->select_limit)
7179 7180 7181 7182
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
7183
    DBUG_RETURN(TRUE);
7184
  }
7185
  DBUG_RETURN(FALSE);
7186 7187 7188 7189 7190 7191 7192
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
7193
    thd			Thread handler
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7194
    tables		Global/local table list
7195

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7196
  RETURN VALUE
7197 7198
    FALSE OK
    TRUE  error
7199
*/
7200

7201
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
7202 7203 7204
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
7205
    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
7206
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7207
  DBUG_ENTER("multi_delete_precheck");
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7208

7209 7210 7211
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
  if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
7212 7213 7214 7215 7216 7217 7218 7219 7220 7221 7222 7223
      check_table_access(thd, SELECT_ACL, tables, 0))
    DBUG_RETURN(TRUE);

  /*
    Since aux_tables list is not part of LEX::query_tables list we
    have to juggle with LEX::query_tables_own_last value to be able
    call check_table_access() safely.
  */
  thd->lex->query_tables_own_last= 0;
  if (check_table_access(thd, DELETE_ACL, aux_tables, 0))
  {
    thd->lex->query_tables_own_last= save_query_tables_own_last;
7224
    DBUG_RETURN(TRUE);
7225 7226 7227
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

7228 7229
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7230 7231
    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
7232
    DBUG_RETURN(TRUE);
7233
  }
7234 7235 7236 7237 7238 7239 7240 7241 7242 7243 7244 7245 7246 7247 7248 7249 7250 7251 7252 7253 7254 7255 7256 7257 7258
  DBUG_RETURN(FALSE);
}


/*
  Link tables in auxilary table list of multi-delete with corresponding
  elements in main table list, and set proper locks for them.

  SYNOPSIS
    multi_delete_set_locks_and_link_aux_tables()
      lex - pointer to LEX representing multi-delete

  RETURN VALUE
    FALSE - success
    TRUE  - error
*/

bool multi_delete_set_locks_and_link_aux_tables(LEX *lex)
{
  TABLE_LIST *tables= (TABLE_LIST*)lex->select_lex.table_list.first;
  TABLE_LIST *target_tbl;
  DBUG_ENTER("multi_delete_set_locks_and_link_aux_tables");

  lex->table_count= 0;

7259
  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
7260
       target_tbl; target_tbl= target_tbl->next_local)
7261
  {
7262
    lex->table_count++;
7263 7264
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7265
    for (walk= tables; walk; walk= walk->next_local)
7266
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7267 7268 7269
      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
7270 7271 7272 7273
	break;
    }
    if (!walk)
    {
7274
      my_error(ER_UNKNOWN_TABLE, MYF(0),
7275
               target_tbl->table_name, "MULTI DELETE");
7276
      DBUG_RETURN(TRUE);
7277
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
7278 7279 7280 7281 7282
    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
7283
    walk->updating= target_tbl->updating;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7284
    walk->lock_type= target_tbl->lock_type;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7285
    target_tbl->correspondent_table= walk;	// Remember corresponding table
7286
  }
7287
  DBUG_RETURN(FALSE);
7288 7289 7290
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7291 7292 7293 7294 7295
/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
7296 7297
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7298 7299

  RETURN VALUE
7300 7301
    FALSE OK
    TRUE  Error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7302
*/
7303

7304
bool update_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7305 7306 7307 7308
{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7309
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7310
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7311
  }
7312 7313
  DBUG_RETURN(check_db_used(thd, tables) ||
	       check_one_table_access(thd, UPDATE_ACL, tables));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7314 7315 7316 7317 7318 7319 7320 7321
}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
7322 7323
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7324 7325

  RETURN VALUE
7326 7327
    FALSE  OK
    TRUE   error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7328
*/
7329

7330
bool delete_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7331 7332 7333
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
7334
    DBUG_RETURN(TRUE);
7335
  /* Set privilege for the WHERE clause */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7336
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
7337
  DBUG_RETURN(FALSE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7338 7339 7340 7341 7342 7343 7344 7345
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
7346 7347
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7348 7349

  RETURN VALUE
7350 7351
    FALSE  OK
    TRUE   error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7352
*/
7353

bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7354
bool insert_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7355 7356 7357 7358
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

7359 7360 7361 7362
  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
monty@mysql.com's avatar
monty@mysql.com committed
7363 7364 7365
  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7366 7367

  if (check_one_table_access(thd, privilege, tables))
7368
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7369

7370
  if (lex->update_list.elements != lex->value_list.elements)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7371
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7372
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7373
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7374
  }
7375 7376
  if (check_db_used(thd, tables))
    DBUG_RETURN(TRUE);
7377
  DBUG_RETURN(FALSE);
7378
}
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7379 7380 7381 7382 7383 7384 7385


/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
7386 7387 7388
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7389 7390

  RETURN VALUE
7391 7392
    FALSE   OK
    TRUE   Error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7393
*/
7394

7395 7396
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7397 7398
{
  LEX *lex= thd->lex;
7399 7400
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7401
  bool error= TRUE;                                 // Error message is given
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7402
  DBUG_ENTER("create_table_precheck");
7403 7404 7405

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7406
  if (check_access(thd, want_priv, create_table->db,
7407 7408
		   &create_table->grant.privilege, 0, 0,
                   test(create_table->schema_table)) ||
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7409 7410 7411
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
7412 7413
    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
7414
      check_grant(thd, want_priv, create_table, 0, 1, 0))
7415 7416 7417 7418 7419 7420
    goto err;

  if (select_lex->item_list.elements)
  {
    /* Check permissions for used tables in CREATE TABLE ... SELECT */

7421 7422
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
7423
    /*
monty@mysql.com's avatar
monty@mysql.com committed
7424 7425 7426
      Only do the check for PS, becasue we on execute we have to check that
      against the opened tables to ensure we don't use a table that is part
      of the view (which can only be done after the table has been opened).
7427
    */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
7428
    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
7429
    {
monty@mysql.com's avatar
monty@mysql.com committed
7430 7431 7432 7433
      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
monty@mysql.com's avatar
monty@mysql.com committed
7434
          find_table_in_global_list(tables, create_table->db,
7435
                                    create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
7436
      {
7437
	error= FALSE;
monty@mysql.com's avatar
monty@mysql.com committed
7438 7439 7440
        goto err;
      }
    }
7441
#endif
7442 7443 7444
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7445
  error= FALSE;
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err:
  DBUG_RETURN(error);
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}
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/*
  negate given expression

  SYNOPSIS
    negate_expression()
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    thd  thread handler
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    expr expression for negation

  RETURN
    negated expression
*/

Item *negate_expression(THD *thd, Item *expr)
{
  Item *negated;
  if (expr->type() == Item::FUNC_ITEM &&
      ((Item_func *) expr)->functype() == Item_func::NOT_FUNC)
  {
    /* it is NOT(NOT( ... )) */
    Item *arg= ((Item_func *) expr)->arguments()[0];
    enum_parsing_place place= thd->lex->current_select->parsing_place;
    if (arg->is_bool_func() || place == IN_WHERE || place == IN_HAVING)
      return arg;
    /*
      if it is not boolean function then we have to emulate value of
      not(not(a)), it will be a != 0
    */
    return new Item_func_ne(arg, new Item_int((char*) "0", 0, 1));
  }

  if ((negated= expr->neg_transformer(thd)) != 0)
    return negated;
  return new Item_func_not(expr);
}
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/*
  Set the specified definer to the default value, which is the current user in
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  the thread.
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  SYNOPSIS
    get_default_definer()
    thd       [in] thread handler
    definer   [out] definer
*/
 
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void get_default_definer(THD *thd, LEX_USER *definer)
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{
  const Security_context *sctx= thd->security_ctx;

  definer->user.str= (char *) sctx->priv_user;
  definer->user.length= strlen(definer->user.str);

  definer->host.str= (char *) sctx->priv_host;
  definer->host.length= strlen(definer->host.str);
}

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/*
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  Create default definer for the specified THD.
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  SYNOPSIS
    create_default_definer()
    thd         [in] thread handler

  RETURN
    On success, return a valid pointer to the created and initialized
    LEX_USER, which contains definer information.
    On error, return 0.
*/

LEX_USER *create_default_definer(THD *thd)
{
  LEX_USER *definer;

  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
    return 0;

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  get_default_definer(thd, definer);
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  return definer;
}


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/*
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  Create definer with the given user and host names.
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  SYNOPSIS
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    create_definer()
    thd         [in] thread handler
    user_name   [in] user name
    host_name   [in] host name
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  RETURN
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    On success, return a valid pointer to the created and initialized
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    LEX_USER, which contains definer information.
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    On error, return 0.
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*/

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LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
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{
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  LEX_USER *definer;

  /* Create and initialize. */

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  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
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    return 0;

  definer->user= *user_name;
  definer->host= *host_name;

  return definer;
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}
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/*
  Retuns information about user or current user.

  SYNOPSIS
    get_current_user()
    thd         [in] thread handler
    user        [in] user

  RETURN
    On success, return a valid pointer to initialized
    LEX_USER, which contains user information.
    On error, return 0.
*/

LEX_USER *get_current_user(THD *thd, LEX_USER *user)
{
  if (!user->user.str)  // current_user
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    return create_default_definer(thd);

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  return user;
}
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/*
  Check that length of a string does not exceed some limit.

  SYNOPSIS
    check_string_length()
      str         string to be checked
      err_msg     error message to be displayed if the string is too long
      max_length  max length

  RETURN
    FALSE   the passed string is not longer than max_length
    TRUE    the passed string is longer than max_length
*/

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bool check_string_length(LEX_STRING *str, const char *err_msg,
                         uint max_length)
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{
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  if (str->length <= max_length)
    return FALSE;
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  my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_length);
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  return TRUE;
}