1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini chmod implementation for busybox
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4 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | *
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7 | * Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
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8 | * to correctly parse '-rwxgoa'
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9 | *
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10 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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11 | */
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12 |
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13 | /* BB_AUDIT SUSv3 compliant */
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14 | /* BB_AUDIT GNU defects - unsupported long options. */
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15 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
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16 |
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17 | #include "libbb.h"
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18 |
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19 | /* This is a NOEXEC applet. Be very careful! */
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20 |
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21 |
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22 | #define OPT_RECURSE (option_mask32 & 1)
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23 | #define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
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24 | #define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
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25 | #define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
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26 | #define OPT_STR "R" USE_DESKTOP("vcf")
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27 |
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28 | /* coreutils:
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29 | * chmod never changes the permissions of symbolic links; the chmod
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30 | * system call cannot change their permissions. This is not a problem
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31 | * since the permissions of symbolic links are never used.
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32 | * However, for each symbolic link listed on the command line, chmod changes
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33 | * the permissions of the pointed-to file. In contrast, chmod ignores
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34 | * symbolic links encountered during recursive directory traversals.
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35 | */
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36 |
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37 | static int fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
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38 | {
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39 | mode_t newmode;
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40 |
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41 | /* match coreutils behavior */
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42 | if (depth == 0) {
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43 | /* statbuf holds lstat result, but we need stat (follow link) */
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44 | if (stat(fileName, statbuf))
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45 | goto err;
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46 | } else { /* depth > 0: skip links */
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47 | if (S_ISLNK(statbuf->st_mode))
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48 | return TRUE;
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49 | }
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50 | newmode = statbuf->st_mode;
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51 |
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52 | if (!bb_parse_mode((char *)param, &newmode))
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53 | bb_error_msg_and_die("invalid mode: %s", (char *)param);
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54 |
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55 | if (chmod(fileName, newmode) == 0) {
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56 | if (OPT_VERBOSE
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57 | || (OPT_CHANGED && statbuf->st_mode != newmode)
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58 | ) {
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59 | printf("mode of '%s' changed to %04o (%s)\n", fileName,
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60 | newmode & 07777, bb_mode_string(newmode)+1);
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61 | }
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62 | return TRUE;
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63 | }
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64 | err:
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65 | if (!OPT_QUIET)
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66 | bb_perror_msg("%s", fileName);
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67 | return FALSE;
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68 | }
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69 |
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70 | int chmod_main(int argc, char **argv);
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71 | int chmod_main(int argc, char **argv)
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72 | {
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73 | int retval = EXIT_SUCCESS;
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74 | char *arg, **argp;
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75 | char *smode;
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76 |
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77 | /* Convert first encountered -r into ar, -w into aw etc
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78 | * so that getopt would not eat it */
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79 | argp = argv;
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80 | while ((arg = *++argp)) {
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81 | /* Mode spec must be the first arg (sans -R etc) */
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82 | /* (protect against mishandling e.g. "chmod 644 -r") */
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83 | if (arg[0] != '-') {
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84 | arg = NULL;
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85 | break;
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86 | }
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87 | /* An option. Not a -- or valid option? */
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88 | if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
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89 | arg[0] = 'a';
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90 | break;
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91 | }
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92 | }
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93 |
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94 | /* Parse options */
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95 | opt_complementary = "-2";
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96 | getopt32(argv, ("-"OPT_STR) + 1); /* Reuse string */
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97 | argv += optind;
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98 |
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99 | /* Restore option-like mode if needed */
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100 | if (arg) arg[0] = '-';
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101 |
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102 | /* Ok, ready to do the deed now */
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103 | smode = *argv++;
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104 | do {
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105 | if (!recursive_action(*argv,
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106 | OPT_RECURSE, // recurse
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107 | fileAction, // file action
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108 | fileAction, // dir action
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109 | smode, // user data
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110 | 0) // depth
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111 | ) {
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112 | retval = EXIT_FAILURE;
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113 | }
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114 | } while (*++argv);
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115 |
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116 | return retval;
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117 | }
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118 |
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119 | /*
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120 | Security: chmod is too important and too subtle.
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121 | This is a test script (busybox chmod versus coreutils).
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122 | Run it in empty directory.
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123 |
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124 | #!/bin/sh
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125 | t1="/tmp/busybox chmod"
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126 | t2="/usr/bin/chmod"
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127 | create() {
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128 | rm -rf $1; mkdir $1
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129 | (
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130 | cd $1 || exit 1
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131 | mkdir dir
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132 | >up
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133 | >file
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134 | >dir/file
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135 | ln -s dir linkdir
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136 | ln -s file linkfile
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137 | ln -s ../up dir/up
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138 | )
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139 | }
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140 | tst() {
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141 | (cd test1; $t1 $1)
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142 | (cd test2; $t2 $1)
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143 | (cd test1; ls -lR) >out1
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144 | (cd test2; ls -lR) >out2
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145 | echo "chmod $1" >out.diff
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146 | if ! diff -u out1 out2 >>out.diff; then exit 1; fi
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147 | rm out.diff
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148 | }
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149 | echo "If script produced 'out.diff' file, then at least one testcase failed"
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150 | create test1; create test2
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151 | tst "a+w file"
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152 | tst "a-w dir"
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153 | tst "a+w linkfile"
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154 | tst "a-w linkdir"
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155 | tst "-R a+w file"
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156 | tst "-R a-w dir"
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157 | tst "-R a+w linkfile"
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158 | tst "-R a-w linkdir"
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159 | tst "a-r,a+x linkfile"
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160 | */
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