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111
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1 /* Implementation of the CHMOD intrinsic.
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145
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2 Copyright (C) 2006-2020 Free Software Foundation, Inc.
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111
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3 Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
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4
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5 This file is part of the GNU Fortran runtime library (libgfortran).
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6
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7 Libgfortran is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU General Public
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9 License as published by the Free Software Foundation; either
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10 version 3 of the License, or (at your option) any later version.
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11
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12 Libgfortran is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "libgfortran.h"
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27
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28 #if defined(HAVE_SYS_STAT_H)
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29
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30 #include <sys/stat.h> /* For stat, chmod and umask. */
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31
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32
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33 /* INTEGER FUNCTION CHMOD (NAME, MODE)
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34 CHARACTER(len=*), INTENT(IN) :: NAME, MODE
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35
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36 Sets the file permission "chmod" using a mode string.
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37
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38 For MinGW, only _S_IWRITE and _S_IREAD are supported. To set those,
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39 only the user attributes are used.
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40
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41 The mode string allows for the same arguments as POSIX's chmod utility.
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42 a) string containing an octal number.
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43 b) Comma separated list of clauses of the form:
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44 [<who-list>]<op>[<perm-list>|<permcopy>][<op>[<perm-list>|<permcopy>],...]
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45 <who> - 'u', 'g', 'o', 'a'
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46 <op> - '+', '-', '='
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47 <perm> - 'r', 'w', 'x', 'X', 's', t'
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48 If <op> is not followed by a perm-list or permcopy, '-' and '+' do not
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49 change the mode while '=' clears all file mode bits. 'u' stands for the
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50 user permissions, 'g' for the group and 'o' for the permissions for others.
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51 'a' is equivalent to 'ugo'. '+' sets the given permission in addition to
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52 the ones of the file, '-' unsets the given permissions of the file, while
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53 '=' sets the file to that mode. 'r' sets the read, 'w' the write, and
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54 'x' the execute mode. 'X' sets the execute bit if the file is a directory
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55 or if the user, group or other executable bit is set. 't' sets the sticky
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56 bit, 's' (un)sets the and/or S_ISUID/S_ISGID bit.
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57
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58 Note that if <who> is omitted, the permissions are filtered by the umask.
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59
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60 A return value of 0 indicates success, -1 an error of chmod() while 1
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61 indicates a mode parsing error. */
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62
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63
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64 static int
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65 chmod_internal (char *file, char *mode, gfc_charlen_type mode_len)
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66 {
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67 bool ugo[3];
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68 bool rwxXstugo[9];
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69 int set_mode, part;
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70 bool honor_umask, continue_clause = false;
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71 #ifndef __MINGW32__
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72 bool is_dir;
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73 #endif
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74 mode_t mode_mask, file_mode, new_mode;
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75 struct stat stat_buf;
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76
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77 if (mode_len == 0)
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78 return 1;
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79
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80 if (mode[0] >= '0' && mode[0] <= '9')
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81 {
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82 unsigned fmode;
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83 if (sscanf (mode, "%o", &fmode) != 1)
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84 return 1;
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85 return chmod (file, (mode_t) fmode);
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86 }
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87
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88 /* Read the current file mode. */
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89 if (stat (file, &stat_buf))
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90 return 1;
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91
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92 file_mode = stat_buf.st_mode & ~S_IFMT;
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93 #ifndef __MINGW32__
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94 is_dir = stat_buf.st_mode & S_IFDIR;
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95 #endif
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96
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97 #ifdef HAVE_UMASK
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98 /* Obtain the umask without distroying the setting. */
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99 mode_mask = 0;
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100 mode_mask = umask (mode_mask);
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101 (void) umask (mode_mask);
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102 #else
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103 honor_umask = false;
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104 #endif
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105
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131
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106 for (gfc_charlen_type i = 0; i < mode_len; i++)
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111
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107 {
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108 if (!continue_clause)
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109 {
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110 ugo[0] = false;
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111 ugo[1] = false;
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112 ugo[2] = false;
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113 #ifdef HAVE_UMASK
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114 honor_umask = true;
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115 #endif
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116 }
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117 continue_clause = false;
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118 rwxXstugo[0] = false;
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119 rwxXstugo[1] = false;
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120 rwxXstugo[2] = false;
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121 rwxXstugo[3] = false;
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122 rwxXstugo[4] = false;
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123 rwxXstugo[5] = false;
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124 rwxXstugo[6] = false;
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125 rwxXstugo[7] = false;
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126 rwxXstugo[8] = false;
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127 part = 0;
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128 set_mode = -1;
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129 for (; i < mode_len; i++)
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130 {
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131 switch (mode[i])
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132 {
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133 /* User setting: a[ll]/u[ser]/g[roup]/o[ther]. */
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134 case 'a':
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135 if (part > 1)
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136 return 1;
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137 ugo[0] = true;
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138 ugo[1] = true;
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139 ugo[2] = true;
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140 part = 1;
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141 #ifdef HAVE_UMASK
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142 honor_umask = false;
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143 #endif
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144 break;
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145 case 'u':
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146 if (part == 2)
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147 {
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148 rwxXstugo[6] = true;
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149 part = 4;
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150 break;
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151 }
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152 if (part > 1)
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153 return 1;
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154 ugo[0] = true;
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155 part = 1;
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156 #ifdef HAVE_UMASK
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157 honor_umask = false;
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158 #endif
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159 break;
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160 case 'g':
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161 if (part == 2)
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162 {
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163 rwxXstugo[7] = true;
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164 part = 4;
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165 break;
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166 }
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167 if (part > 1)
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168 return 1;
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169 ugo[1] = true;
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170 part = 1;
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171 #ifdef HAVE_UMASK
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172 honor_umask = false;
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173 #endif
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174 break;
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175 case 'o':
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176 if (part == 2)
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177 {
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178 rwxXstugo[8] = true;
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179 part = 4;
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180 break;
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181 }
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182 if (part > 1)
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183 return 1;
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184 ugo[2] = true;
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185 part = 1;
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186 #ifdef HAVE_UMASK
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187 honor_umask = false;
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188 #endif
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189 break;
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190
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191 /* Mode setting: =+-. */
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192 case '=':
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193 if (part > 2)
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194 {
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195 continue_clause = true;
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196 i--;
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197 part = 2;
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198 goto clause_done;
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199 }
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200 set_mode = 1;
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201 part = 2;
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202 break;
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203
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204 case '-':
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205 if (part > 2)
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206 {
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207 continue_clause = true;
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208 i--;
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209 part = 2;
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210 goto clause_done;
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211 }
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212 set_mode = 2;
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213 part = 2;
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214 break;
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215
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216 case '+':
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217 if (part > 2)
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218 {
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219 continue_clause = true;
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220 i--;
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221 part = 2;
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222 goto clause_done;
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223 }
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224 set_mode = 3;
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225 part = 2;
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226 break;
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227
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228 /* Permissions: rwxXst - for ugo see above. */
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229 case 'r':
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230 if (part != 2 && part != 3)
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231 return 1;
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232 rwxXstugo[0] = true;
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233 part = 3;
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234 break;
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235
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236 case 'w':
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237 if (part != 2 && part != 3)
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238 return 1;
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239 rwxXstugo[1] = true;
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240 part = 3;
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241 break;
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242
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243 case 'x':
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244 if (part != 2 && part != 3)
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245 return 1;
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246 rwxXstugo[2] = true;
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247 part = 3;
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248 break;
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249
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250 case 'X':
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251 if (part != 2 && part != 3)
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252 return 1;
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253 rwxXstugo[3] = true;
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254 part = 3;
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255 break;
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256
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257 case 's':
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258 if (part != 2 && part != 3)
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259 return 1;
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260 rwxXstugo[4] = true;
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261 part = 3;
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262 break;
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263
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264 case 't':
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265 if (part != 2 && part != 3)
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266 return 1;
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267 rwxXstugo[5] = true;
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268 part = 3;
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269 break;
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270
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271 /* Tailing blanks are valid in Fortran. */
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272 case ' ':
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273 for (i++; i < mode_len; i++)
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274 if (mode[i] != ' ')
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275 break;
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276 if (i != mode_len)
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277 return 1;
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278 goto clause_done;
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279
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280 case ',':
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281 goto clause_done;
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282
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283 default:
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284 return 1;
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285 }
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286 }
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287
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288 clause_done:
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289 if (part < 2)
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290 return 1;
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291
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292 new_mode = 0;
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293
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294 #ifdef __MINGW32__
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295
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296 /* Read. */
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297 if (rwxXstugo[0] && (ugo[0] || honor_umask))
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298 new_mode |= _S_IREAD;
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299
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300 /* Write. */
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301 if (rwxXstugo[1] && (ugo[0] || honor_umask))
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302 new_mode |= _S_IWRITE;
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303
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304 #else
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305
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306 /* Read. */
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307 if (rwxXstugo[0])
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308 {
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309 if (ugo[0] || honor_umask)
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310 new_mode |= S_IRUSR;
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311 if (ugo[1] || honor_umask)
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312 new_mode |= S_IRGRP;
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313 if (ugo[2] || honor_umask)
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314 new_mode |= S_IROTH;
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315 }
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316
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317 /* Write. */
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318 if (rwxXstugo[1])
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319 {
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320 if (ugo[0] || honor_umask)
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321 new_mode |= S_IWUSR;
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322 if (ugo[1] || honor_umask)
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323 new_mode |= S_IWGRP;
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324 if (ugo[2] || honor_umask)
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325 new_mode |= S_IWOTH;
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326 }
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327
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328 /* Execute. */
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329 if (rwxXstugo[2])
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330 {
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331 if (ugo[0] || honor_umask)
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332 new_mode |= S_IXUSR;
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333 if (ugo[1] || honor_umask)
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334 new_mode |= S_IXGRP;
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335 if (ugo[2] || honor_umask)
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336 new_mode |= S_IXOTH;
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337 }
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338
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339 /* 'X' execute. */
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340 if (rwxXstugo[3]
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341 && (is_dir || (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH))))
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342 new_mode |= (S_IXUSR | S_IXGRP | S_IXOTH);
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343
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344 /* 's'. */
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345 if (rwxXstugo[4])
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346 {
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347 if (ugo[0] || honor_umask)
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348 new_mode |= S_ISUID;
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349 if (ugo[1] || honor_umask)
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350 new_mode |= S_ISGID;
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351 }
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352
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353 /* As original 'u'. */
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354 if (rwxXstugo[6])
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355 {
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356 if (ugo[1] || honor_umask)
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357 {
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358 if (file_mode & S_IRUSR)
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359 new_mode |= S_IRGRP;
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360 if (file_mode & S_IWUSR)
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361 new_mode |= S_IWGRP;
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362 if (file_mode & S_IXUSR)
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363 new_mode |= S_IXGRP;
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364 }
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365 if (ugo[2] || honor_umask)
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366 {
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367 if (file_mode & S_IRUSR)
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368 new_mode |= S_IROTH;
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369 if (file_mode & S_IWUSR)
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370 new_mode |= S_IWOTH;
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371 if (file_mode & S_IXUSR)
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372 new_mode |= S_IXOTH;
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373 }
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374 }
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375
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376 /* As original 'g'. */
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377 if (rwxXstugo[7])
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378 {
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379 if (ugo[0] || honor_umask)
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380 {
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381 if (file_mode & S_IRGRP)
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382 new_mode |= S_IRUSR;
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383 if (file_mode & S_IWGRP)
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384 new_mode |= S_IWUSR;
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385 if (file_mode & S_IXGRP)
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386 new_mode |= S_IXUSR;
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387 }
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388 if (ugo[2] || honor_umask)
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389 {
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390 if (file_mode & S_IRGRP)
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391 new_mode |= S_IROTH;
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392 if (file_mode & S_IWGRP)
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393 new_mode |= S_IWOTH;
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394 if (file_mode & S_IXGRP)
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395 new_mode |= S_IXOTH;
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396 }
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397 }
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398
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399 /* As original 'o'. */
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400 if (rwxXstugo[8])
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401 {
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402 if (ugo[0] || honor_umask)
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403 {
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404 if (file_mode & S_IROTH)
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405 new_mode |= S_IRUSR;
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406 if (file_mode & S_IWOTH)
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407 new_mode |= S_IWUSR;
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408 if (file_mode & S_IXOTH)
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409 new_mode |= S_IXUSR;
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410 }
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411 if (ugo[1] || honor_umask)
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412 {
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413 if (file_mode & S_IROTH)
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414 new_mode |= S_IRGRP;
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415 if (file_mode & S_IWOTH)
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416 new_mode |= S_IWGRP;
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417 if (file_mode & S_IXOTH)
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418 new_mode |= S_IXGRP;
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419 }
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420 }
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421 #endif /* __MINGW32__ */
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422
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423 #ifdef HAVE_UMASK
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424 if (honor_umask)
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425 new_mode &= ~mode_mask;
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426 #endif
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427
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428 if (set_mode == 1)
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429 {
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430 #ifdef __MINGW32__
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431 if (ugo[0] || honor_umask)
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432 file_mode = (file_mode & ~(_S_IWRITE | _S_IREAD))
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433 | (new_mode & (_S_IWRITE | _S_IREAD));
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434 #else
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435 /* Set '='. */
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436 if ((ugo[0] || honor_umask) && !rwxXstugo[6])
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437 file_mode = (file_mode & ~(S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR))
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438 | (new_mode & (S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR));
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439 if ((ugo[1] || honor_umask) && !rwxXstugo[7])
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440 file_mode = (file_mode & ~(S_ISGID | S_IRGRP | S_IWGRP | S_IXGRP))
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441 | (new_mode & (S_ISGID | S_IRGRP | S_IWGRP | S_IXGRP));
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442 if ((ugo[2] || honor_umask) && !rwxXstugo[8])
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443 file_mode = (file_mode & ~(S_IROTH | S_IWOTH | S_IXOTH))
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444 | (new_mode & (S_IROTH | S_IWOTH | S_IXOTH));
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445 #ifndef __VXWORKS__
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446 if (is_dir && rwxXstugo[5])
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447 file_mode |= S_ISVTX;
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448 else if (!is_dir)
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449 file_mode &= ~S_ISVTX;
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450 #endif
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451 #endif
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452 }
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453 else if (set_mode == 2)
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454 {
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455 /* Clear '-'. */
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456 file_mode &= ~new_mode;
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457 #if !defined( __MINGW32__) && !defined (__VXWORKS__)
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458 if (rwxXstugo[5] || !is_dir)
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459 file_mode &= ~S_ISVTX;
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460 #endif
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461 }
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462 else if (set_mode == 3)
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463 {
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464 file_mode |= new_mode;
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465 #if !defined (__MINGW32__) && !defined (__VXWORKS__)
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466 if (rwxXstugo[5] && is_dir)
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467 file_mode |= S_ISVTX;
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468 else if (!is_dir)
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469 file_mode &= ~S_ISVTX;
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|
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470 #endif
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|
|
471 }
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|
|
472 }
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|
|
473
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|
|
474 return chmod (file, file_mode);
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|
|
475 }
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|
|
476
|
|
|
477
|
|
|
478 extern int chmod_func (char *, char *, gfc_charlen_type, gfc_charlen_type);
|
|
|
479 export_proto(chmod_func);
|
|
|
480
|
|
|
481 int
|
|
|
482 chmod_func (char *name, char *mode, gfc_charlen_type name_len,
|
|
|
483 gfc_charlen_type mode_len)
|
|
|
484 {
|
|
|
485 char *cname = fc_strdup (name, name_len);
|
|
|
486 int ret = chmod_internal (cname, mode, mode_len);
|
|
|
487 free (cname);
|
|
|
488 return ret;
|
|
|
489 }
|
|
|
490
|
|
|
491
|
|
|
492 extern void chmod_i4_sub (char *, char *, GFC_INTEGER_4 *,
|
|
|
493 gfc_charlen_type, gfc_charlen_type);
|
|
|
494 export_proto(chmod_i4_sub);
|
|
|
495
|
|
|
496 void
|
|
|
497 chmod_i4_sub (char *name, char *mode, GFC_INTEGER_4 * status,
|
|
|
498 gfc_charlen_type name_len, gfc_charlen_type mode_len)
|
|
|
499 {
|
|
|
500 int val;
|
|
|
501
|
|
|
502 val = chmod_func (name, mode, name_len, mode_len);
|
|
|
503 if (status)
|
|
|
504 *status = val;
|
|
|
505 }
|
|
|
506
|
|
|
507
|
|
|
508 extern void chmod_i8_sub (char *, char *, GFC_INTEGER_8 *,
|
|
|
509 gfc_charlen_type, gfc_charlen_type);
|
|
|
510 export_proto(chmod_i8_sub);
|
|
|
511
|
|
|
512 void
|
|
|
513 chmod_i8_sub (char *name, char *mode, GFC_INTEGER_8 * status,
|
|
|
514 gfc_charlen_type name_len, gfc_charlen_type mode_len)
|
|
|
515 {
|
|
|
516 int val;
|
|
|
517
|
|
|
518 val = chmod_func (name, mode, name_len, mode_len);
|
|
|
519 if (status)
|
|
|
520 *status = val;
|
|
|
521 }
|
|
|
522
|
|
|
523 #endif
|
