my_access.c 5.6 KB
Newer Older
unknown's avatar
unknown committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
/* Copyright (C) 2000 MySQL AB

   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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   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.

   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 */

#include "mysys_priv.h"
unknown's avatar
unknown committed
18
#include <m_string.h>
unknown's avatar
unknown committed
19 20 21 22

#ifdef __WIN__

/*
unknown's avatar
unknown committed
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
  Check a file or path for accessability.
 
  SYNOPSIS
    file_access()
    path 	Path to file
    amode	Access method
 
  DESCRIPTION
    This function wraps the normal access method because the access 
    available in MSVCRT> +reports that filenames such as LPT1 and 
    COM1 are valid (they are but should not be so for us).
 
  RETURN VALUES
  0    ok
  -1   error  (We use -1 as my_access is mapped to access on other platforms)
*/

unknown's avatar
unknown committed
40 41
int my_access(const char *path, int amode) 
{ 
unknown's avatar
unknown committed
42 43
  WIN32_FILE_ATTRIBUTE_DATA fileinfo;
  BOOL result;
unknown's avatar
unknown committed
44
	
unknown's avatar
unknown committed
45 46
  result= GetFileAttributesEx(path, GetFileExInfoStandard, &fileinfo);
  if (! result ||
47
      (fileinfo.dwFileAttributes & FILE_ATTRIBUTE_READONLY) && (amode & W_OK))
unknown's avatar
unknown committed
48 49 50 51 52
  {
    my_errno= errno= EACCES;
    return -1;
  }
  return 0;
unknown's avatar
unknown committed
53 54
}

unknown's avatar
unknown committed
55 56
#endif /* __WIN__ */

57
#if defined(MSDOS) || defined(__WIN__)
unknown's avatar
unknown committed
58 59 60 61 62

/*
  List of file names that causes problem on windows

  NOTE that one can also not have file names of type CON.TXT
63 64 65
  
  NOTE: it is important to keep "CLOCK$" on the first place,
  we skip it in check_if_legal_tablename.
unknown's avatar
unknown committed
66 67 68
*/
static const char *reserved_names[]=
{
69 70 71 72
  "CLOCK$",
  "CON", "PRN", "AUX", "NUL",
  "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
  "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
unknown's avatar
unknown committed
73 74 75 76 77
  NullS
};

#define MAX_RESERVED_NAME_LENGTH 6

78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158

/*
  Looks up a null-terminated string in a list,
  case insensitively.
 
  SYNOPSIS
    str_list_find()
    list        list of items
    str         item to find

  RETURN
    0  ok
    1  reserved file name
*/
static int str_list_find(const char **list, const char *str)
{
  const char **name;
  for (name= list; *name; name++)
  {
    if (!my_strcasecmp(&my_charset_latin1, *name, str))
      return 1;
  }
  return 0;
}


/*
  A map for faster reserved_names lookup,
  helps to avoid loops in many cases.
  1 - can be the first letter
  2 - can be the second letter
  4 - can be the third letter
*/
static char reserved_map[256]=
{
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*  !"#$%&'()*+,-./ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0123456789:;<=>? */
  0,1,0,1,0,0,0,0,0,0,0,0,7,4,5,2, /* @ABCDEFGHIJKLMNO */
  3,0,2,0,4,2,0,0,4,0,0,0,0,0,0,0, /* PQRSTUVWXYZ[\]^_ */
  0,1,0,1,0,0,0,0,0,0,0,0,7,4,5,2, /* bcdefghijklmno */
  3,0,2,0,4,2,0,0,4,0,0,0,0,0,0,0, /* pqrstuvwxyz{|}~. */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0  /* ................ */
};


/*
  Check if a table name may cause problems
 
  SYNOPSIS
    check_if_legal_tablename
    name 	Table name (without any extensions)

  DESCRIPTION
    We don't check 'CLOCK$' because dollar sign is encoded as @0024,
    making table file name 'CLOCK@0024', which is safe.
    This is why we start lookup from the second element
    (i.e. &reserver_name[1])

  RETURN
    0  ok
    1  reserved file name
*/

int check_if_legal_tablename(const char *name)
{
  DBUG_ENTER("check_if_legal_tablename");
  DBUG_RETURN((reserved_map[(uchar) name[0]] & 1) &&
              (reserved_map[(uchar) name[1]] & 2) &&
              (reserved_map[(uchar) name[2]] & 4) &&
              str_list_find(&reserved_names[1], name));
}

unknown's avatar
unknown committed
159 160 161 162 163 164 165 166
#else

int check_if_legal_tablename(const char *name)
{
  return 0;
}

#endif /* defined(MSDOS) || defined(__WIN__) */
167 168 169 170

#if defined(MSDOS) || defined(__WIN__) || defined(__EMX__)


unknown's avatar
unknown committed
171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
/*
  Check if a path will access a reserverd file name that may cause problems
 
  SYNOPSIS
    check_if_legal_filename
    path 	Path to file

  RETURN
    0  ok
    1  reserved file name
*/

int check_if_legal_filename(const char *path)
{
  const char *end;
  const char **reserved_name;
  DBUG_ENTER("check_if_legal_filename");

  path+= dirname_length(path);                  /* To start of filename */
  if (!(end= strchr(path, FN_EXTCHAR)))
    end= strend(path);
unknown's avatar
unknown committed
192
  if (path == end || (uint) (end - path) > MAX_RESERVED_NAME_LENGTH)
unknown's avatar
unknown committed
193 194 195 196
    DBUG_RETURN(0);                             /* Simplify inner loop */

  for (reserved_name= reserved_names; *reserved_name; reserved_name++)
  {
unknown's avatar
unknown committed
197
    const char *reserved= *reserved_name;       /* never empty */
unknown's avatar
unknown committed
198
    const char *name= path;
unknown's avatar
unknown committed
199
    
unknown's avatar
unknown committed
200
    do
unknown's avatar
unknown committed
201
    {
unknown's avatar
unknown committed
202
      if (*reserved != my_toupper(&my_charset_latin1, *name))
unknown's avatar
unknown committed
203
        break;
204
      if (++name == end && !reserved[1])
unknown's avatar
unknown committed
205
        DBUG_RETURN(1);                         /* Found wrong path */
unknown's avatar
unknown committed
206
    } while (*++reserved);
unknown's avatar
unknown committed
207 208 209
  }
  DBUG_RETURN(0);
}
unknown's avatar
unknown committed
210 211

#endif /* defined(MSDOS) || defined(__WIN__) || defined(__EMX__) */