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annotate lib/euidaccess.c @ 10662:ad36db29dad7

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Move the euidaccess() declaration to <unistd.h>.
author Bruno Haible <bruno@clisp.org>
date Sun, 19 Oct 2008 12:43:15 +0200
parents bbbbbf4cd1c5
children 660d7f74a5e8
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1 /* euidaccess -- check if effective user id can access file
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2
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3 Copyright (C) 1990, 1991, 1995, 1998, 2000, 2003, 2004, 2005, 2006, 2008
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4 Free Software Foundation, Inc.
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5
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6 This file is part of the GNU C Library.
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7
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8 This program is free software: you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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20
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21 /* Written by David MacKenzie and Torbjorn Granlund.
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22 Adapted for GNU C library by Roland McGrath. */
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23
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24 #ifndef _LIBC
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25 # include <config.h>
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26 #endif
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27
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28 #include <sys/types.h>
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29 #include <sys/stat.h>
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30 #include <unistd.h>
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31
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32 #if HAVE_LIBGEN_H
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33 # include <libgen.h>
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34 #endif
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35
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36 #include <errno.h>
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37 #ifndef __set_errno
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38 # define __set_errno(val) errno = (val)
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39 #endif
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40
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41 #if defined EACCES && !defined EACCESS
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42 # define EACCESS EACCES
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43 #endif
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44
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45 #ifndef F_OK
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46 # define F_OK 0
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47 # define X_OK 1
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48 # define W_OK 2
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49 # define R_OK 4
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50 #endif
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51
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52
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53 #ifdef _LIBC
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54
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55 # define access __access
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56 # define getuid __getuid
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57 # define getgid __getgid
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58 # define geteuid __geteuid
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59 # define getegid __getegid
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60 # define group_member __group_member
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61 # define euidaccess __euidaccess
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62 # undef stat
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63 # define stat stat64
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64
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65 #else
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66
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67 # include "group-member.h"
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68
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69 #endif
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70
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71 /* Return 0 if the user has permission of type MODE on FILE;
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72 otherwise, return -1 and set `errno'.
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73 Like access, except that it uses the effective user and group
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74 id's instead of the real ones, and it does not always check for read-only
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75 file system, text busy, etc. */
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76
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77 int
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78 euidaccess (const char *file, int mode)
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79 {
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80 #if defined EFF_ONLY_OK
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81 return access (file, mode | EFF_ONLY_OK);
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82 #elif defined ACC_SELF
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83 return accessx (file, mode, ACC_SELF);
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84 #elif HAVE_EACCESS
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85 return eaccess (file, mode);
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86 #else
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87
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88 uid_t uid = getuid ();
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89 gid_t gid = getgid ();
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90 uid_t euid = geteuid ();
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91 gid_t egid = getegid ();
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92 struct stat stats;
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93
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94 # if HAVE_DECL_SETREGID && PREFER_NONREENTRANT_EUIDACCESS
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95
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96 /* Define PREFER_NONREENTRANT_EUIDACCESS if you prefer euidaccess to
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97 return the correct result even if this would make it
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98 nonreentrant. Define this only if your entire application is
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99 safe even if the uid or gid might temporarily change. If your
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100 application uses signal handlers or threads it is probably not
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101 safe. */
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102
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103 if (mode == F_OK)
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104 return stat (file, &stats);
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105 else
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106 {
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107 int result;
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108 int saved_errno;
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109
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110 if (uid != euid)
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111 setreuid (euid, uid);
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112 if (gid != egid)
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113 setregid (egid, gid);
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114
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115 result = access (file, mode);
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116 saved_errno = errno;
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117
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118 /* Restore them. */
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119 if (uid != euid)
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120 setreuid (uid, euid);
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121 if (gid != egid)
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122 setregid (gid, egid);
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123
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124 errno = saved_errno;
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125 return result;
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126 }
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127
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128 # else
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129
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130 /* The following code assumes the traditional Unix model, and is not
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131 correct on systems that have ACLs or the like. However, it's
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132 better than nothing, and it is reentrant. */
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133
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134 unsigned int granted;
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135 if (uid == euid && gid == egid)
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136 /* If we are not set-uid or set-gid, access does the same. */
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137 return access (file, mode);
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138
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139 if (stat (file, &stats) != 0)
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140 return -1;
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141
509
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142 /* The super-user can read and write any file, and execute any file
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143 that anyone can execute. */
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144 if (euid == 0 && ((mode & X_OK) == 0
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145 || (stats.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))))
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146 return 0;
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147
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148 /* Convert the mode to traditional form, clearing any bogus bits. */
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149 if (R_OK == 4 && W_OK == 2 && X_OK == 1 && F_OK == 0)
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150 mode &= 7;
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151 else
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152 mode = ((mode & R_OK ? 4 : 0)
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153 + (mode & W_OK ? 2 : 0)
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154 + (mode & X_OK ? 1 : 0));
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155
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156 if (mode == 0)
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157 return 0; /* The file exists. */
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158
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159 /* Convert the file's permission bits to traditional form. */
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160 if (S_IRUSR == (4 << 6) && S_IWUSR == (2 << 6) && S_IXUSR == (1 << 6)
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161 && S_IRGRP == (4 << 3) && S_IWGRP == (2 << 3) && S_IXGRP == (1 << 3)
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162 && S_IROTH == (4 << 0) && S_IWOTH == (2 << 0) && S_IXOTH == (1 << 0))
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163 granted = stats.st_mode;
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164 else
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165 granted = ((stats.st_mode & S_IRUSR ? 4 << 6 : 0)
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166 + (stats.st_mode & S_IWUSR ? 2 << 6 : 0)
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167 + (stats.st_mode & S_IXUSR ? 1 << 6 : 0)
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168 + (stats.st_mode & S_IRGRP ? 4 << 3 : 0)
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169 + (stats.st_mode & S_IWGRP ? 2 << 3 : 0)
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170 + (stats.st_mode & S_IXGRP ? 1 << 3 : 0)
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171 + (stats.st_mode & S_IROTH ? 4 << 0 : 0)
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172 + (stats.st_mode & S_IWOTH ? 2 << 0 : 0)
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173 + (stats.st_mode & S_IXOTH ? 1 << 0 : 0));
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174
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175 if (euid == stats.st_uid)
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176 granted >>= 6;
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177 else if (egid == stats.st_gid || group_member (stats.st_gid))
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178 granted >>= 3;
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179
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180 if ((mode & ~granted) == 0)
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181 return 0;
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182 __set_errno (EACCESS);
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183 return -1;
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184
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185 # endif
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186 #endif
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187 }
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188 #undef euidaccess
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189 #ifdef weak_alias
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190 weak_alias (__euidaccess, euidaccess)
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191 #endif
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192
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193 #ifdef TEST
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194 # include <error.h>
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195 # include <stdio.h>
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196 # include <stdlib.h>
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197
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198 char *program_name;
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199
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200 int
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201 main (int argc, char **argv)
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202 {
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203 char *file;
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204 int mode;
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205 int err;
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206
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207 program_name = argv[0];
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208 if (argc < 3)
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209 abort ();
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210 file = argv[1];
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211 mode = atoi (argv[2]);
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212
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213 err = euidaccess (file, mode);
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214 printf ("%d\n", err);
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215 if (err != 0)
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216 error (0, errno, "%s", file);
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217 exit (0);
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218 }
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219 #endif