Client attributes

client/mysql.cc

@@ -1359,6 +1359,9 @@ sig_handler handle_sigint(int sig)
   }
 
   kill_mysql= mysql_init(kill_mysql);
+  mysql_options(kill_mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(kill_mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysql");
   if (!mysql_real_connect(kill_mysql,current_host, current_user, opt_password,
                           "", opt_mysql_port, opt_mysql_unix_port,0))
   {
@@ -4606,6 +4609,9 @@ sql_real_connect(char *host,char *database,char *user,char *password,
   if (opt_default_auth && *opt_default_auth)
     mysql_options(&mysql, MYSQL_DEFAULT_AUTH, opt_default_auth);
 
+  mysql_options(&mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(&mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysql");
   if (!mysql_real_connect(&mysql, host, user, password,
                           database, opt_mysql_port, opt_mysql_unix_port,
                           connect_flag | CLIENT_MULTI_STATEMENTS))

client/mysqladmin.cc

@@ -370,6 +370,9 @@ int main(int argc,char *argv[])
   if (opt_default_auth && *opt_default_auth)
     mysql_options(&mysql, MYSQL_DEFAULT_AUTH, opt_default_auth);
 
+  mysql_options(&mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(&mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysqladmin");
   if (sql_connect(&mysql, option_wait))
   {
     /*

client/mysqlbinlog.cc

@@ -1745,6 +1745,9 @@ static Exit_status safe_connect()
     mysql_options(mysql, MYSQL_SHARED_MEMORY_BASE_NAME,
                   shared_memory_base_name);
 #endif
+  mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysqlbinlog");
   if (!mysql_real_connect(mysql, host, user, pass, 0, port, sock, 0))
   {
     error("Failed on connect: %s", mysql_error(mysql));

client/mysqlcheck.c

@@ -915,6 +915,9 @@ static int dbConnect(char *host, char *user, char *passwd)
     mysql_options(&mysql_connection, MYSQL_DEFAULT_AUTH, opt_default_auth);
 
   mysql_options(&mysql_connection, MYSQL_SET_CHARSET_NAME, default_charset);
+  mysql_options(&mysql_connection, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(&mysql_connection, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysqlcheck");
   if (!(sock = mysql_real_connect(&mysql_connection, host, user, passwd,
          NULL, opt_mysql_port, opt_mysql_unix_port, 0)))
   {

client/mysqldump.c

@@ -1542,6 +1542,9 @@ static int connect_to_db(char *host, char *user,char *passwd)
   if (opt_default_auth && *opt_default_auth)
     mysql_options(&mysql_connection, MYSQL_DEFAULT_AUTH, opt_default_auth);
 
+  mysql_options(&mysql_connection, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(&mysql_connection, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysqldump");
   mysql= &mysql_connection;          /* So we can mysql_close() it properly */
   if (!mysql_real_connect(&mysql_connection,host,user,passwd,
                           NULL,opt_mysql_port,opt_mysql_unix_port, 0))

client/mysqlimport.c

@@ -456,6 +456,9 @@ static MYSQL *db_connect(char *host, char *database,
     mysql_options(mysql, MYSQL_DEFAULT_AUTH, opt_default_auth);
 
   mysql_options(mysql, MYSQL_SET_CHARSET_NAME, default_charset);
+  mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysqlimport");
   if (!(mysql_real_connect(mysql,host,user,passwd,
                            database,opt_mysql_port,opt_mysql_unix_port,
                            0)))

client/mysqlshow.c

@@ -141,6 +141,9 @@ int main(int argc, char **argv)
   if (opt_default_auth && *opt_default_auth)
     mysql_options(&mysql, MYSQL_DEFAULT_AUTH, opt_default_auth);
 
+  mysql_options(&mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(&mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysqlshow");
   if (!(mysql_real_connect(&mysql,host,user,opt_password,
 			   (first_argument_uses_wildcards) ? "" :
                            argv[0],opt_mysql_port,opt_mysql_unix_port,

client/mysqlslap.c

@@ -362,6 +362,9 @@ int main(int argc, char **argv)
   if (opt_default_auth && *opt_default_auth)
     mysql_options(&mysql, MYSQL_DEFAULT_AUTH, opt_default_auth);
 
+  mysql_options(&mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(&mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysqlslap");
   if (!opt_only_print) 
   {
     if (!(mysql_real_connect(&mysql, host, user, opt_password,

client/mysqltest.cc

@@ -5648,6 +5648,10 @@ void safe_connect(MYSQL* mysql, const char *name, const char *host,
   verbose_msg("Connecting to server %s:%d (socket %s) as '%s'"
               ", connection '%s', attempt %d ...", 
               host, port, sock, user, name, failed_attempts);
+
+  mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                 "program_name", "mysqltest");
   while(!mysql_real_connect(mysql, host,user, pass, db, port, sock,
                             CLIENT_MULTI_STATEMENTS | CLIENT_REMEMBER_OPTIONS))
   {
@@ -5748,7 +5752,9 @@ int connect_n_handle_errors(struct st_command *command,
     replace_dynstr_append(ds, command->query);
     dynstr_append_mem(ds, ";\n", 2);
   }
-  
+
+  mysql_options(con, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
+  mysql_options4(con, MYSQL_OPT_CONNECT_ATTR_ADD, "program_name", "mysqltest");
   while (!mysql_real_connect(con, host, user, pass, db, port, sock ? sock: 0,
                           CLIENT_MULTI_STATEMENTS))
   {

include/mysql.h

@@ -557,6 +557,8 @@ int             STDCALL mysql_list_processes_cont(MYSQL_RES **ret, MYSQL *mysql,
                                                   int status);
 int		STDCALL mysql_options(MYSQL *mysql,enum mysql_option option,
 				      const void *arg);
+int             STDCALL mysql_options4(MYSQL *mysql,enum mysql_option option,
+                                       const void *arg1, const void *arg2);
 void		STDCALL mysql_free_result(MYSQL_RES *result);
 int             STDCALL mysql_free_result_start(MYSQL_RES *result);
 int             STDCALL mysql_free_result_cont(MYSQL_RES *result, int status);

include/mysql.h.pp

@@ -552,6 +552,8 @@ int mysql_list_processes_cont(MYSQL_RES **ret, MYSQL *mysql,
                                                   int status);
 int mysql_options(MYSQL *mysql,enum mysql_option option,
           const void *arg);
+int mysql_options4(MYSQL *mysql,enum mysql_option option,
+                   const void *arg1, const void *arg2);
 void mysql_free_result(MYSQL_RES *result);
 int mysql_free_result_start(MYSQL_RES *result);
 int mysql_free_result_cont(MYSQL_RES *result, int status);

include/mysql/psi/psi.h

@@ -1921,6 +1921,7 @@ typedef struct PSI_digest_locker* (*digest_add_token_v1_t)
 typedef int (*set_thread_connect_attrs_v1_t)(const char *buffer, uint length,
                                              const void *from_cs);
 
+
 /**
   Performance Schema Interface, version 1.
   @since PSI_VERSION_1

include/mysql_com.h

@@ -264,7 +264,8 @@ enum enum_server_command
                            CLIENT_SSL_VERIFY_SERVER_CERT | \
                            CLIENT_REMEMBER_OPTIONS | \
                            CLIENT_PROGRESS | \
-                           CLIENT_PLUGIN_AUTH)
+                           CLIENT_PLUGIN_AUTH | \
+                           CLIENT_CONNECT_ATTRS)
 
 /*
   To be added later:

include/sql_common.h

@@ -43,6 +43,8 @@ struct st_mysql_options_extention {
                           const char *proc_info,
                           uint proc_info_length);
   struct mysql_async_context *async_context;
+  HASH connection_attributes;
+  size_t connection_attributes_length;
 };
 
 typedef struct st_mysql_methods
@@ -116,6 +118,7 @@ int mysql_client_plugin_init();
 void mysql_client_plugin_deinit();
 struct st_mysql_client_plugin;
 extern struct st_mysql_client_plugin *mysql_client_builtins[];
+uchar * send_client_connect_attrs(MYSQL *mysql, uchar *buf);
 
 /* Non-blocking client API. */
 void my_context_install_suspend_resume_hook(struct mysql_async_context *b,

libmysql/client_settings.h

@@ -34,7 +34,8 @@ extern char *	mysql_unix_port;
                              CLIENT_SECURE_CONNECTION | \
                              CLIENT_MULTI_RESULTS | \
                              CLIENT_PS_MULTI_RESULTS | \
-                             CLIENT_PLUGIN_AUTH)
+                             CLIENT_PLUGIN_AUTH | \
+                             CLIENT_CONNECT_ATTRS)
 
 sig_handler my_pipe_sig_handler(int sig);
 void read_user_name(char *name);

libmysqld/lib_sql.cc

@@ -638,7 +638,6 @@ void init_embedded_mysql(MYSQL *mysql, int client_flag)
   thd->mysql= mysql;
   mysql->server_version= server_version;
   mysql->client_flag= client_flag;
-  //mysql->server_capabilities= client_flag;
   init_alloc_root(&mysql->field_alloc, 8192, 0, MYF(0));
 }
 
@@ -698,12 +697,38 @@ err:
 }
 
 
+static void
+emb_transfer_connect_attrs(MYSQL *mysql)
+{
+#ifdef HAVE_PSI_THREAD_INTERFACE
+  if (mysql->options.extension &&
+      mysql->options.extension->connection_attributes_length)
+  {
+    uchar *buf, *ptr;
+    THD *thd= (THD*)mysql->thd;
+    size_t length= mysql->options.extension->connection_attributes_length;
+
+    /* 9 = max length of the serialized length */
+    ptr= buf= (uchar *) my_alloca(length + 9);
+    send_client_connect_attrs(mysql, buf);
+    net_field_length_ll(&ptr);
+    PSI_THREAD_CALL(set_thread_connect_attrs)((char *) ptr, length, thd->charset());
+    my_afree(buf);
+  }
+#endif
+}
+
+
 #ifdef NO_EMBEDDED_ACCESS_CHECKS
 int check_embedded_connection(MYSQL *mysql, const char *db)
 {
   int result;
   LEX_STRING db_str = { (char*)db, db ? strlen(db) : 0 };
   THD *thd= (THD*)mysql->thd;
+
+  /* the server does the same as the client */
+  mysql->server_capabilities= mysql->client_flag;
+
   thd_init_client_charset(thd, mysql->charset->number);
   thd->update_charset();
   Security_context *sctx= thd->security_ctx;
@@ -713,6 +738,7 @@ int check_embedded_connection(MYSQL *mysql, const char *db)
   sctx->user= my_strdup(mysql->user, MYF(0));
   sctx->proxy_user[0]= 0;
   sctx->master_access= GLOBAL_ACLS;       // Full rights
+  emb_transfer_connect_attrs(mysql);
   /* Change database if necessary */
   if (!(result= (db && db[0] && mysql_change_db(thd, &db_str, FALSE))))
     my_ok(thd);
@@ -728,11 +754,16 @@ int check_embedded_connection(MYSQL *mysql, const char *db)
     we emulate a COM_CHANGE_USER user here,
     it's easier than to emulate the complete 3-way handshake
   */
-  char buf[USERNAME_LENGTH + SCRAMBLE_LENGTH + 1 + 2*NAME_LEN + 2], *end;
+  char *buf, *end;
   NET *net= &mysql->net;
   THD *thd= (THD*)mysql->thd;
   Security_context *sctx= thd->security_ctx;
+  size_t connect_attrs_len=
+    (mysql->options.extension) ?
+    mysql->options.extension->connection_attributes_length : 0;
 
+  buf= my_alloca(USERNAME_LENGTH + SCRAMBLE_LENGTH + 1 + 2*NAME_LEN + 2 +
+                 connect_attrs_len + 2);
   if (mysql->options.client_ip)
   {
     sctx->host= my_strdup(mysql->options.client_ip, MYF(0));
@@ -766,6 +797,13 @@ int check_embedded_connection(MYSQL *mysql, const char *db)
   int2store(end, (ushort) mysql->charset->number);
   end+= 2;
 
+  end= strmake(end, "mysql_native_password", NAME_LEN) + 1;
+
+  /* the server does the same as the client */
+  mysql->server_capabilities= mysql->client_flag;
+
+  end= (char *) send_client_connect_attrs(mysql, (uchar *) end);
+
   /* acl_authenticate() takes the data from thd->net->read_pos */
   thd->net.read_pos= (uchar*)buf;
 
@@ -774,6 +812,7 @@ int check_embedded_connection(MYSQL *mysql, const char *db)
     my_free(thd->security_ctx->user);
     goto err;
   }
+  my_afree(buf);
   return 0;
 
 err:
@@ -781,6 +820,7 @@ err:
   memcpy(net->sqlstate,
          mysql_errno_to_sqlstate(thd->get_stmt_da()->sql_errno()),
          sizeof(net->sqlstate)-1);
+  my_afree(buf);
   return 1;
 }
 #endif

mysql-test/suite/perfschema/r/connect_attrs.result

+# must return 0, 6
+SELECT SUM(ISNULL(ATTR_VALUE)), COUNT(*)
+FROM performance_schema.session_connect_attrs
+WHERE ATTR_NAME IN ('_os', '_client_name', '_pid',
+'_client_version', '_platform', 'program_name')
+AND PROCESSLIST_ID = CONNECTION_ID();
+SUM(ISNULL(ATTR_VALUE))	COUNT(*)
+0	6
+# must return 1
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+FROM performance_schema.session_connect_attrs;
+COUNT(DISTINCT PROCESSLIST_ID)
+1
+# must return 0, 6
+SELECT SUM(ISNULL(ATTR_VALUE)), COUNT(*)
+FROM performance_schema.session_account_connect_attrs
+WHERE ATTR_NAME IN ('_os', '_client_name', '_pid',
+'_client_version', '_platform', 'program_name')
+AND PROCESSLIST_ID = CONNECTION_ID();
+SUM(ISNULL(ATTR_VALUE))	COUNT(*)
+0	6
+# must return 1
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+FROM performance_schema.session_account_connect_attrs;
+COUNT(DISTINCT PROCESSLIST_ID)
+1
+CREATE USER wl5924@localhost;
+# must return 1
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+FROM performance_schema.session_account_connect_attrs;
+COUNT(DISTINCT PROCESSLIST_ID)
+1
+# must return 2
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+FROM performance_schema.session_connect_attrs;
+COUNT(DISTINCT PROCESSLIST_ID)
+2
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+FROM performance_schema.session_account_connect_attrs;
+ERROR 42000: SELECT command denied to user 'wl5924'@'localhost' for table 'session_account_connect_attrs'
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+FROM performance_schema.session_connect_attrs;
+ERROR 42000: SELECT command denied to user 'wl5924'@'localhost' for table 'session_connect_attrs'
+grant select on performance_schema.* to wl5924@localhost;
+SELECT SUM(ISNULL(ATTR_VALUE)), COUNT(*)
+FROM performance_schema.session_account_connect_attrs
+WHERE ATTR_NAME IN ('_os', '_client_name', '_pid',
+'_client_version', '_platform', 'program_name')
+AND PROCESSLIST_ID = CONNECTION_ID();
+SUM(ISNULL(ATTR_VALUE))	COUNT(*)
+0	6
+DROP USER wl5924@localhost;

mysql-test/suite/perfschema/t/connect_attrs.test

+# Session connect attributes test
+--source include/have_perfschema.inc
+
+# although the connection attributes transfer code works
+# with embedded P_S is not active, so the test won't run.
+# TODO: remove this when P_S works with embedded.
+--source include/not_embedded.inc
+
+# make sure we're alone
+let $count_sessions= 1;
+--source include/wait_until_count_sessions.inc
+
+# basic performance_schema.session_connect_attrs tests
+
+# check the presense of the pre-defined attributes
+--echo # must return 0, 6
+SELECT SUM(ISNULL(ATTR_VALUE)), COUNT(*)
+  FROM performance_schema.session_connect_attrs
+  WHERE ATTR_NAME IN ('_os', '_client_name', '_pid',
+                      '_client_version', '_platform', 'program_name')
+    AND PROCESSLIST_ID = CONNECTION_ID();
+
+# check the presense of the pre-defined attributes
+--echo # must return 1
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+  FROM performance_schema.session_connect_attrs;
+
+
+# basic performance_schema.session_account_connect_attrs tests
+
+# check the presense of the pre-defined attributes
+--echo # must return 0, 6
+SELECT SUM(ISNULL(ATTR_VALUE)), COUNT(*)
+  FROM performance_schema.session_account_connect_attrs
+  WHERE ATTR_NAME IN ('_os', '_client_name', '_pid',
+                      '_client_version', '_platform', 'program_name')
+    AND PROCESSLIST_ID = CONNECTION_ID();
+
+# check the presense of the pre-defined attributes
+--echo # must return 1
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+  FROM performance_schema.session_account_connect_attrs;
+
+
+
+CREATE USER wl5924@localhost;
+
+connect(non_privileged_user,localhost,wl5924,,test);
+connection default;
+
+--echo # must return 1
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+  FROM performance_schema.session_account_connect_attrs;
+
+--echo # must return 2
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+  FROM performance_schema.session_connect_attrs;
+
+connection non_privileged_user;
+--error ER_TABLEACCESS_DENIED_ERROR
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+  FROM performance_schema.session_account_connect_attrs;
+
+--error ER_TABLEACCESS_DENIED_ERROR
+SELECT COUNT(DISTINCT PROCESSLIST_ID)
+  FROM performance_schema.session_connect_attrs;
+
+connection default;
+disconnect non_privileged_user;
+
+grant select on performance_schema.* to wl5924@localhost;
+change_user wl5924;
+SELECT SUM(ISNULL(ATTR_VALUE)), COUNT(*)
+  FROM performance_schema.session_account_connect_attrs
+  WHERE ATTR_NAME IN ('_os', '_client_name', '_pid',
+                      '_client_version', '_platform', 'program_name')
+    AND PROCESSLIST_ID = CONNECTION_ID();
+change_user root,,test;
+
+DROP USER wl5924@localhost;
+
+# Wait till all disconnects are completed
+--source include/wait_until_count_sessions.inc

sql-common/client.c

@@ -37,6 +37,7 @@
 #include <my_global.h>
 #include <my_default.h>
 #include "mysql.h"
+#include "hash.h"
 
 /* Remove client convenience wrappers */
 #undef max_allowed_packet
@@ -1216,17 +1217,30 @@ static int add_init_command(struct st_mysql_options *options, const char *cmd)
   return 0;
 }
 
-#define EXTENSION_SET(OPTS, X, VAL)                              \
-    if (!(OPTS)->extension)                                      \
+
+#define ALLOCATE_EXTENSIONS(OPTS)                                \
       (OPTS)->extension= (struct st_mysql_options_extention *)   \
         my_malloc(sizeof(struct st_mysql_options_extention),     \
-                  MYF(MY_WME | MY_ZEROFILL));                    \
-    (OPTS)->extension->X= (VAL);
+                  MYF(MY_WME | MY_ZEROFILL))                     \
+
+
+#define ENSURE_EXTENSIONS_PRESENT(OPTS)                          \
+    do {                                                         \
+      if (!(OPTS)->extension)                                    \
+        ALLOCATE_EXTENSIONS(OPTS);                               \
+    } while (0)
+
 
 #define EXTENSION_SET_STRING(OPTS, X, STR)                       \
-    if ((OPTS)->extension)                                       \
-      my_free((OPTS)->extension->X);                             \
-  EXTENSION_SET(OPTS, X, (STR) ? my_strdup((STR), MYF(MY_WME)) : NULL);
+    do {                                                         \
+      if ((OPTS)->extension)                                     \
+        my_free((OPTS)->extension->X);                           \
+      else                                                       \
+        ALLOCATE_EXTENSIONS(OPTS);                               \
+      (OPTS)->extension->X= ((STR) != NULL) ?                    \
+        my_strdup((STR), MYF(MY_WME)) : NULL;                    \
+    } while (0)
+
 
 #if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
 #define SET_SSL_OPTION(OPTS, opt_var, arg)        \
@@ -2376,6 +2390,7 @@ static auth_plugin_t old_password_client_plugin=
   old_password_auth_client
 };
 
+
 struct st_mysql_client_plugin *mysql_client_builtins[]=
 {
   (struct st_mysql_client_plugin *)&native_password_client_plugin,
@@ -2383,6 +2398,67 @@ struct st_mysql_client_plugin *mysql_client_builtins[]=
   0
 };
 
+
+static uchar *
+write_length_encoded_string3(uchar *buf, char *string, size_t length)
+{
+  buf= net_store_length(buf, length);
+  memcpy(buf, string, length);
+  buf+= length;
+  return buf;
+}
+
+
+uchar *
+send_client_connect_attrs(MYSQL *mysql, uchar *buf)
+{
+  /* check if the server supports connection attributes */
+  if (mysql->server_capabilities & CLIENT_CONNECT_ATTRS)
+  {
+
+    /* Always store the length if the client supports it */
+    buf= net_store_length(buf,
+                          mysql->options.extension ?
+                          mysql->options.extension->connection_attributes_length :
+                          0);
+
+    /* check if we have connection attributes */
+    if (mysql->options.extension &&
+        my_hash_inited(&mysql->options.extension->connection_attributes))
+    {
+      HASH *attrs= &mysql->options.extension->connection_attributes;
+      ulong idx;
+
+      /* loop over and dump the connection attributes */
+      for (idx= 0; idx < attrs->records; idx++)
+      {
+        LEX_STRING *attr= (LEX_STRING *) my_hash_element(attrs, idx);
+        LEX_STRING *key= attr, *value= attr + 1;
+
+        /* we can't have zero length keys */
+        DBUG_ASSERT(key->length);
+
+        buf= write_length_encoded_string3(buf, key->str, key->length);
+        buf= write_length_encoded_string3(buf, value->str, value->length);
+      }
+    }
+  }
+  return buf;
+}
+
+
+static size_t get_length_store_length(size_t length)
+{
+  /* as defined in net_store_length */
+  #define MAX_VARIABLE_STRING_LENGTH 9
+  uchar length_buffer[MAX_VARIABLE_STRING_LENGTH], *ptr;
+
+  ptr= net_store_length(length_buffer, length);
+
+  return ptr - &length_buffer[0];
+}
+
+
 /* this is a "superset" of MYSQL_PLUGIN_VIO, in C++ I use inheritance */
 typedef struct {
   int (*read_packet)(struct st_plugin_vio *vio, uchar **buf);
@@ -2426,8 +2502,13 @@ static int send_change_user_packet(MCPVIO_EXT *mpvio,
   MYSQL *mysql= mpvio->mysql;
   char *buff, *end;
   int res= 1;
+  size_t connect_attrs_len=
+    (mysql->server_capabilities & CLIENT_CONNECT_ATTRS &&
+     mysql->options.extension) ?
+    mysql->options.extension->connection_attributes_length : 0;
 
-  buff= my_alloca(USERNAME_LENGTH+1 + data_len+1 + NAME_LEN+1 + 2 + NAME_LEN+1);
+  buff= my_alloca(USERNAME_LENGTH + data_len + 1 + NAME_LEN + 2 + NAME_LEN +
+                  connect_attrs_len + 9 /* for the length of the attrs */);
 
   end= strmake(buff, mysql->user, USERNAME_LENGTH) + 1;
 
@@ -2464,6 +2545,8 @@ static int send_change_user_packet(MCPVIO_EXT *mpvio,
   if (mysql->server_capabilities & CLIENT_PLUGIN_AUTH)
     end= strmake(end, mpvio->plugin->name, NAME_LEN) + 1;
 
+  end= (char *) send_client_connect_attrs(mysql, (uchar *) end);
+
   res= simple_command(mysql, COM_CHANGE_USER,
                       (uchar*)buff, (ulong)(end-buff), 1);
 
@@ -2472,6 +2555,7 @@ error:
   return res;
 }
 
+#define MAX_CONNECTION_ATTR_STORAGE_LENGTH 65536
 
 /**
   sends a client authentication packet (second packet in the 3-way handshake)
@@ -2509,10 +2593,21 @@ static int send_client_reply_packet(MCPVIO_EXT *mpvio,
   MYSQL *mysql= mpvio->mysql;
   NET *net= &mysql->net;
   char *buff, *end;
+  size_t buff_size;
+  size_t connect_attrs_len=
+    (mysql->server_capabilities & CLIENT_CONNECT_ATTRS &&
+     mysql->options.extension) ?
+    mysql->options.extension->connection_attributes_length : 0;
+
+  DBUG_ASSERT(connect_attrs_len < MAX_CONNECTION_ATTR_STORAGE_LENGTH);
+
+  /*
+    see end= buff+32 below, fixed size of the packet is 32 bytes.
+     +9 because data is a length encoded binary where meta data size is max 9.
+  */
+  buff_size= 33 + USERNAME_LENGTH + data_len + 9 + NAME_LEN + NAME_LEN + connect_attrs_len + 9;
+  buff= my_alloca(buff_size);
 
-  /* see end= buff+32 below, fixed size of the packet is 32 bytes */
-  buff= my_alloca(33 + USERNAME_LENGTH + data_len + NAME_LEN + NAME_LEN);
-  
   mysql->client_flag|= mysql->options.client_flag;
   mysql->client_flag|= CLIENT_CAPABILITIES;
 
@@ -2665,6 +2760,8 @@ static int send_client_reply_packet(MCPVIO_EXT *mpvio,
   if (mysql->server_capabilities & CLIENT_PLUGIN_AUTH)
     end= strmake(end, mpvio->plugin->name, NAME_LEN) + 1;
 
+  end= (char *) send_client_connect_attrs(mysql, (uchar *) end);
+
   /* Write authentication package */
   if (my_net_write(net, (uchar*) buff, (size_t) (end-buff)) || net_flush(net))
   {
@@ -3024,6 +3121,51 @@ connect_sync_or_async(MYSQL *mysql, NET *net, my_socket fd,
   return my_connect(fd, name, namelen, mysql->options.connect_timeout);
 }
 
+
+/** set some default attributes */
+static int
+set_connect_attributes(MYSQL *mysql, char *buff, size_t buf_len)
+{
+  int rc= 0;
+
+  /*
+    Clean up any values set by the client code. We want these options as
+    consistent as possible
+  */
+  rc+= mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_DELETE, "_client_name");
+  rc+= mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_DELETE, "_os");
+  rc+= mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_DELETE, "_platform");
+  rc+= mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_DELETE, "_pid");
+  rc+= mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_DELETE, "_thread");
+  rc+= mysql_options(mysql, MYSQL_OPT_CONNECT_ATTR_DELETE, "_client_version");
+
+  /*
+   Now let's set up some values
+  */
+  rc+= mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                     "_client_name", "libmysql");
+  rc+= mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                      "_client_version", PACKAGE_VERSION);
+  rc+= mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                      "_os", SYSTEM_TYPE);
+  rc+= mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
+                      "_platform", MACHINE_TYPE);
+#ifdef __WIN__
+  snprintf(buff, buf_len, "%lu", (ulong) GetCurrentProcessId());
+#else
+  snprintf(buff, buf_len, "%lu", (ulong) getpid());
+#endif
+  rc+= mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD, "_pid", buff);
+
+#ifdef __WIN__
+  snprintf(buff, buf_len, "%lu", (ulong) GetCurrentThreadId());
+  rc+= mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD, "_thread", buff);
+#endif
+
+  return rc > 0 ? 1 : 0;
+}
+
+
 MYSQL * STDCALL 
 CLI_MYSQL_REAL_CONNECT(MYSQL *mysql,const char *host, const char *user,
 		       const char *passwd, const char *db,
@@ -3057,6 +3199,9 @@ CLI_MYSQL_REAL_CONNECT(MYSQL *mysql,const char *host, const char *user,
     DBUG_RETURN(0);
   }
 
+  if (set_connect_attributes(mysql, buff, sizeof(buff)))
+    DBUG_RETURN(0);
+
   mysql->methods= &client_methods;
   net->vio = 0;				/* If something goes wrong */
   mysql->client_flag=0;			/* For handshake */
@@ -3757,6 +3902,7 @@ static void mysql_close_free_options(MYSQL *mysql)
     struct mysql_async_context *ctxt= mysql->options.extension->async_context;
     my_free(mysql->options.extension->plugin_dir);
     my_free(mysql->options.extension->default_auth);
+    my_hash_free(&mysql->options.extension->connection_attributes);
     if (ctxt)
     {
       my_context_destroy(&ctxt->async_context);
@@ -4320,7 +4466,8 @@ mysql_options(MYSQL *mysql,enum mysql_option option, const void *arg)
       my_free(ctxt);
       DBUG_RETURN(1);
     }
-    EXTENSION_SET(&(mysql->options), async_context, ctxt)
+    ENSURE_EXTENSIONS_PRESENT(&(mysql->options));
+    mysql->options.extension->async_context= ctxt;
     if (mysql->net.vio)
       mysql->net.vio->async_context= ctxt;
     break;
@@ -4345,6 +4492,145 @@ mysql_options(MYSQL *mysql,enum mysql_option option, const void *arg)
   case MYSQL_OPT_SSL_CRLPATH:
     EXTENSION_SET_SSL_STRING(&mysql->options, ssl_crlpath, arg);
     break;
+  case MYSQL_OPT_CONNECT_ATTR_RESET:
+    ENSURE_EXTENSIONS_PRESENT(&mysql->options);
+    if (my_hash_inited(&mysql->options.extension->connection_attributes))
+    {
+      my_hash_free(&mysql->options.extension->connection_attributes);
+      mysql->options.extension->connection_attributes_length= 0;
+    }
+    break;
+  case MYSQL_OPT_CONNECT_ATTR_DELETE:
+    ENSURE_EXTENSIONS_PRESENT(&mysql->options);
+    if (my_hash_inited(&mysql->options.extension->connection_attributes))
+    {
+      size_t len;
+      uchar *elt;
+
+      len= arg ? strlen(arg) : 0;
+
+      if (len)
+      {
+        elt= my_hash_search(&mysql->options.extension->connection_attributes,
+                            arg, len);
+        if (elt)
+        {
+          LEX_STRING *attr= (LEX_STRING *) elt;
+          LEX_STRING *key= attr, *value= attr + 1;
+
+          mysql->options.extension->connection_attributes_length-=
+            get_length_store_length(key->length) + key->length +
+            get_length_store_length(value->length) + value->length;
+
+          my_hash_delete(&mysql->options.extension->connection_attributes,
+                         elt);
+
+        }
+      }
+    }
+    break;
+  default:
+    break;
+    DBUG_RETURN(1);
+  }
+  DBUG_RETURN(0);
+}
+/**
+  A function to return the key from a connection attribute
+*/
+uchar *
+get_attr_key(LEX_STRING *part, size_t *length,
+             my_bool not_used __attribute__((unused)))
+{
+  *length= part[0].length;
+  return (uchar *) part[0].str;
+}
+
+int STDCALL
+mysql_options4(MYSQL *mysql,enum mysql_option option,
+               const void *arg1, const void *arg2)
+{
+  DBUG_ENTER("mysql_option");
+  DBUG_PRINT("enter",("option: %d",(int) option));
+
+  switch (option)
+  {
+  case MYSQL_OPT_CONNECT_ATTR_ADD:
+    {
+      LEX_STRING *elt;
+      char *key, *value;
+      size_t key_len= arg1 ? strlen(arg1) : 0,
+             value_len= arg2 ? strlen(arg2) : 0;
+      size_t attr_storage_length= key_len + value_len;
+
+      /* we can't have a zero length key */
+      if (!key_len)
+      {
+        set_mysql_error(mysql, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
+        DBUG_RETURN(1);
+      }
+
+      /* calculate the total storage length of the attribute */
+      attr_storage_length+= get_length_store_length(key_len);
+      attr_storage_length+= get_length_store_length(value_len);
+
+      ENSURE_EXTENSIONS_PRESENT(&mysql->options);
+
+      /*
+        Throw and error if the maximum combined length of the attribute value
+        will be greater than the maximum that we can safely transmit.
+      */
+      if (attr_storage_length +
+          mysql->options.extension->connection_attributes_length >
+          MAX_CONNECTION_ATTR_STORAGE_LENGTH)
+      {
+        set_mysql_error(mysql, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
+        DBUG_RETURN(1);
+      }
+
+      if (!my_hash_inited(&mysql->options.extension->connection_attributes))
+      {
+        if (my_hash_init(&mysql->options.extension->connection_attributes,
+                     &my_charset_bin, 0, 0, 0, (my_hash_get_key) get_attr_key,
+                     my_free, HASH_UNIQUE))
+        {
+          set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
+          DBUG_RETURN(1);
+        }
+      }
+      if (!my_multi_malloc(MY_WME,
+                           &elt, 2 * sizeof(LEX_STRING),
+                           &key, key_len + 1,
+                           &value, value_len + 1,
+                           NULL))
+      {
+        set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
+        DBUG_RETURN(1);
+      }
+      elt[0].str= key; elt[0].length= key_len;
+      elt[1].str= value; elt[1].length= value_len;
+      if (key_len)
+        memcpy(key, arg1, key_len);
+      key[key_len]= 0;
+      if (value_len)
+        memcpy(value, arg2, value_len);
+      value[value_len]= 0;
+      if (my_hash_insert(&mysql->options.extension->connection_attributes,
+                     (uchar *) elt))
+      {
+        /* can't insert the value */
+        my_free(elt);
+        set_mysql_error(mysql, CR_DUPLICATE_CONNECTION_ATTR,
+                        unknown_sqlstate);
+        DBUG_RETURN(1);
+      }
+
+      mysql->options.extension->connection_attributes_length+=
+        attr_storage_length;
+
+      break;
+    }
+
   default:
     DBUG_RETURN(1);
   }

sql/client_settings.h

@@ -30,11 +30,11 @@
 */
 #define CLIENT_CAPABILITIES (CLIENT_LONG_PASSWORD | \
                              CLIENT_LONG_FLAG |     \
-                             CLIENT_SECURE_CONNECTION | \
                              CLIENT_TRANSACTIONS |  \
                              CLIENT_PROTOCOL_41 |   \
                              CLIENT_SECURE_CONNECTION | \
-                             CLIENT_PLUGIN_AUTH)
+                             CLIENT_PLUGIN_AUTH | \
+                             CLIENT_CONNECT_ATTRS)
 
 #define read_user_name(A) {}
 #undef _CUSTOMCONFIG_

sql/sql_acl.cc

@@ -8217,6 +8217,56 @@ static bool find_mpvio_user(MPVIO_EXT *mpvio)
                       mpvio->acl_user->plugin.str));
   DBUG_RETURN(0);
 }
+
+static bool
+read_client_connect_attrs(char **ptr, char *end,
+                          const CHARSET_INFO *from_cs)
+{
+  size_t length, length_length;
+  size_t max_bytes_available= end - *ptr;
+  /* not enough bytes to hold the length */
+  if ((*ptr) >= (end - 1))
+    return true;
+
+  /* read the length */
+  if (max_bytes_available >= 9)
+  {
+    char *ptr_save= *ptr;
+    length= net_field_length_ll((uchar **) ptr);
+    length_length= *ptr - ptr_save;
+    DBUG_ASSERT(length_length <= 9);
+  }
+  else
+  {
+    /* to avoid reading unallocated and uninitialized memory */
+    char buf[10]={'\0','\0','\0','\0','\0','\0','\0','\0','\0','\0',},
+         *len_ptr= buf;
+    memcpy(buf, *ptr, max_bytes_available);
+    length= net_field_length_ll((uchar **) &len_ptr);
+    length_length= len_ptr - buf;
+    *ptr+= length_length;
+    if (max_bytes_available < length_length)
+      return true;
+  }
+  max_bytes_available-= length_length;
+
+  /* length says there're more data than can fit into the packet */
+  if (length > max_bytes_available)
+    return true;
+
+  /* impose an artificial length limit of 64k */
+  if (length > 65535)
+    return true;
+
+#ifdef HAVE_PSI_THREAD_INTERFACE
+  if (PSI_THREAD_CALL(set_thread_connect_attrs)(*ptr, length, from_cs) &&
+      current_thd->variables.log_warnings)
+    sql_print_warning("Connection attributes of length %lu were truncated",
+                      (unsigned long) length);
+#endif
+  return false;
+}
+
 #endif
 
 /* the packet format is described in send_change_user_packet() */
@@ -8269,13 +8319,14 @@ static bool parse_com_change_user_packet(MPVIO_EXT *mpvio, uint packet_length)
 
   uint db_len= strlen(db);
 
-  char *ptr= db + db_len + 1;
+  char *next_field= db + db_len + 1;
 
-  if (ptr + 1 < end)
+  if (next_field + 1 < end)
   {
-    if (thd_init_client_charset(thd, uint2korr(ptr)))
+    if (thd_init_client_charset(thd, uint2korr(next_field)))
       DBUG_RETURN(1);
     thd->update_charset();
+    next_field+= 2;
   }
 
   /* Convert database and user names to utf8 */
@@ -8318,13 +8369,13 @@ static bool parse_com_change_user_packet(MPVIO_EXT *mpvio, uint packet_length)
   char *client_plugin;
   if (thd->client_capabilities & CLIENT_PLUGIN_AUTH)
   {
-    client_plugin= ptr + 2;
-    if (client_plugin >= end)
+    if (next_field >= end)
     {
       my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
       DBUG_RETURN(1);
     }
-    client_plugin= fix_plugin_ptr(client_plugin);
+    client_plugin= fix_plugin_ptr(next_field);
+    next_field+= strlen(next_field) + 1;
   }
   else
   {
@@ -8344,6 +8395,11 @@ static bool parse_com_change_user_packet(MPVIO_EXT *mpvio, uint packet_length)
     }
   }
 
+  if ((mpvio->thd->client_capabilities & CLIENT_CONNECT_ATTRS) &&
+      read_client_connect_attrs(&next_field, end,
+                                mpvio->thd->charset()))
+    return packet_error;
+
   DBUG_PRINT("info", ("client_plugin=%s, restart", client_plugin));
   /* 
     Remember the data part of the packet, to present it to plugin in 
@@ -8482,7 +8538,8 @@ static ulong parse_client_handshake_packet(MPVIO_EXT *mpvio,
   /* strlen() can't be easily deleted without changing protocol */
   db_len= db ? strlen(db) : 0;
 
-  char *client_plugin= passwd + passwd_len + (db ? db_len + 1 : 0);
+  char *next_field;
+  char *client_plugin= next_field= passwd + passwd_len + (db ? db_len + 1 : 0);
 
   /* Since 4.1 all database names are stored in utf8 */
   if (db)
@@ -8549,6 +8606,7 @@ static ulong parse_client_handshake_packet(MPVIO_EXT *mpvio,
       (client_plugin < (char *)net->read_pos + pkt_len))
   {
     client_plugin= fix_plugin_ptr(client_plugin);
+    next_field+= strlen(next_field) + 1;
   }
   else
   {
@@ -8570,7 +8628,12 @@ static ulong parse_client_handshake_packet(MPVIO_EXT *mpvio,
         mpvio->acl_user->plugin= old_password_plugin_name;
     }
   }
-  
+
+  if ((thd->client_capabilities & CLIENT_CONNECT_ATTRS) &&
+      read_client_connect_attrs(&next_field, ((char *)net->read_pos) + pkt_len,
+                                mpvio->thd->charset()))
+    return packet_error;
+
   /*
     if the acl_user needs a different plugin to authenticate
     (specified in GRANT ... AUTHENTICATED VIA plugin_name ..)

storage/perfschema/pfs_server.h

@@ -54,6 +54,9 @@
 #ifndef PFS_STATEMENTS_STACK_SIZE
   #define PFS_STATEMENTS_STACK_SIZE 10
 #endif
+#ifndef PFS_CONNECT_ATTRS_SIZE
+  #define PFS_SESSION_CONNECT_ATTRS_SIZE 2048
+#endif
 
 struct PFS_sizing_hints
 {