1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini chown 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 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | /* BB_AUDIT SUSv3 defects - none? */
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11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */
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12 |
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13 | #include "libbb.h"
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14 |
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15 | /* This is a NOEXEC applet. Be very careful! */
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16 |
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17 |
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18 | #define OPT_STR ("Rh" IF_DESKTOP("vcfLHP"))
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19 | #define BIT_RECURSE 1
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20 | #define OPT_RECURSE (opt & 1)
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21 | #define OPT_NODEREF (opt & 2)
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22 | #define OPT_VERBOSE (IF_DESKTOP(opt & 0x04) IF_NOT_DESKTOP(0))
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23 | #define OPT_CHANGED (IF_DESKTOP(opt & 0x08) IF_NOT_DESKTOP(0))
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24 | #define OPT_QUIET (IF_DESKTOP(opt & 0x10) IF_NOT_DESKTOP(0))
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25 | /* POSIX options
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26 | * -L traverse every symbolic link to a directory encountered
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27 | * -H if a command line argument is a symbolic link to a directory, traverse it
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28 | * -P do not traverse any symbolic links (default)
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29 | * We do not conform to the following:
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30 | * "Specifying more than one of -H, -L, and -P is not an error.
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31 | * The last option specified shall determine the behavior of the utility." */
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32 | /* -L */
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33 | #define BIT_TRAVERSE 0x20
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34 | #define OPT_TRAVERSE (IF_DESKTOP(opt & BIT_TRAVERSE) IF_NOT_DESKTOP(0))
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35 | /* -H or -L */
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36 | #define BIT_TRAVERSE_TOP (0x20|0x40)
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37 | #define OPT_TRAVERSE_TOP (IF_DESKTOP(opt & BIT_TRAVERSE_TOP) IF_NOT_DESKTOP(0))
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38 |
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39 | #if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
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40 | static const char chown_longopts[] ALIGN1 =
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41 | "recursive\0" No_argument "R"
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42 | "dereference\0" No_argument "\xff"
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43 | "no-dereference\0" No_argument "h"
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44 | # if ENABLE_DESKTOP
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45 | "changes\0" No_argument "c"
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46 | "silent\0" No_argument "f"
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47 | "quiet\0" No_argument "f"
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48 | "verbose\0" No_argument "v"
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49 | # endif
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50 | ;
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51 | #endif
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52 |
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53 | typedef int (*chown_fptr)(const char *, uid_t, gid_t);
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54 |
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55 | struct param_t {
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56 | struct bb_uidgid_t ugid;
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57 | chown_fptr chown_func;
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58 | };
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59 |
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60 | static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf,
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61 | void *vparam, int depth UNUSED_PARAM)
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62 | {
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63 | #define param (*(struct param_t*)vparam)
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64 | #define opt option_mask32
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65 | uid_t u = (param.ugid.uid == (uid_t)-1L) ? statbuf->st_uid : param.ugid.uid;
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66 | gid_t g = (param.ugid.gid == (gid_t)-1L) ? statbuf->st_gid : param.ugid.gid;
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67 |
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68 | if (param.chown_func(fileName, u, g) == 0) {
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69 | if (OPT_VERBOSE
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70 | || (OPT_CHANGED && (statbuf->st_uid != u || statbuf->st_gid != g))
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71 | ) {
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72 | printf("changed ownership of '%s' to %u:%u\n",
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73 | fileName, (unsigned)u, (unsigned)g);
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74 | }
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75 | return TRUE;
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76 | }
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77 | if (!OPT_QUIET)
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78 | bb_simple_perror_msg(fileName);
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79 | return FALSE;
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80 | #undef opt
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81 | #undef param
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82 | }
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83 |
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84 | int chown_main(int argc UNUSED_PARAM, char **argv)
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85 | {
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86 | int retval = EXIT_SUCCESS;
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87 | int opt, flags;
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88 | struct param_t param;
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89 |
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90 | /* Just -1 might not work: uid_t may be unsigned long */
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91 | param.ugid.uid = -1L;
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92 | param.ugid.gid = -1L;
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93 |
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94 | #if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
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95 | applet_long_options = chown_longopts;
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96 | #endif
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97 | opt_complementary = "-2";
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98 | opt = getopt32(argv, OPT_STR);
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99 | argv += optind;
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100 |
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101 | /* This matches coreutils behavior (almost - see below) */
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102 | param.chown_func = chown;
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103 | if (OPT_NODEREF
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104 | /* || (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
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105 | IF_DESKTOP( || (opt & (BIT_RECURSE|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
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106 | ) {
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107 | param.chown_func = lchown;
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108 | }
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109 |
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110 | flags = ACTION_DEPTHFIRST; /* match coreutils order */
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111 | if (OPT_RECURSE)
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112 | flags |= ACTION_RECURSE;
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113 | if (OPT_TRAVERSE_TOP)
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114 | flags |= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */
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115 | if (OPT_TRAVERSE)
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116 | flags |= ACTION_FOLLOWLINKS; /* follow links if -L */
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117 |
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118 | parse_chown_usergroup_or_die(¶m.ugid, argv[0]);
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119 |
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120 | /* Ok, ready to do the deed now */
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121 | while (*++argv) {
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122 | if (!recursive_action(*argv,
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123 | flags, /* flags */
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124 | fileAction, /* file action */
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125 | fileAction, /* dir action */
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126 | ¶m, /* user data */
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127 | 0) /* depth */
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128 | ) {
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129 | retval = EXIT_FAILURE;
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130 | }
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131 | }
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132 |
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133 | return retval;
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134 | }
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135 |
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136 | /*
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137 | Testcase. Run in empty directory.
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138 |
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139 | #!/bin/sh
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140 | t1="/tmp/busybox chown"
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141 | t2="/usr/bin/chown"
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142 | create() {
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143 | rm -rf $1; mkdir $1
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144 | (
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145 | cd $1 || exit 1
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146 | mkdir dir dir2
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147 | >up
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148 | >file
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149 | >dir/file
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150 | >dir2/file
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151 | ln -s dir linkdir
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152 | ln -s file linkfile
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153 | ln -s ../up dir/linkup
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154 | ln -s ../dir2 dir/linkupdir2
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155 | )
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156 | chown -R 0:0 $1
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157 | }
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158 | tst() {
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159 | create test1
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160 | create test2
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161 | echo "[$1]" >>test1.out
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162 | echo "[$1]" >>test2.out
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163 | (cd test1; $t1 $1) >>test1.out 2>&1
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164 | (cd test2; $t2 $1) >>test2.out 2>&1
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165 | (cd test1; ls -lnR) >out1
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166 | (cd test2; ls -lnR) >out2
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167 | echo "chown $1" >out.diff
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168 | if ! diff -u out1 out2 >>out.diff; then exit 1; fi
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169 | rm out.diff
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170 | }
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171 | tst_for_each() {
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172 | tst "$1 1:1 file"
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173 | tst "$1 1:1 dir"
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174 | tst "$1 1:1 linkdir"
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175 | tst "$1 1:1 linkfile"
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176 | }
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177 | echo "If script produced 'out.diff' file, then at least one testcase failed"
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178 | >test1.out
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179 | >test2.out
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180 | # These match coreutils 6.8:
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181 | tst_for_each "-v"
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182 | tst_for_each "-vR"
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183 | tst_for_each "-vRP"
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184 | tst_for_each "-vRL"
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185 | tst_for_each "-vRH"
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186 | tst_for_each "-vh"
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187 | tst_for_each "-vhR"
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188 | tst_for_each "-vhRP"
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189 | tst_for_each "-vhRL"
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190 | tst_for_each "-vhRH"
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191 | # Fix `name' in coreutils output
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192 | sed 's/`/'"'"'/g' -i test2.out
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193 | # Compare us with coreutils output
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194 | diff -u test1.out test2.out
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195 |
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196 | */
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