coreutils/chown.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini chown implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9 //config:config CHOWN
  10 //config:       bool "chown (7.6 kb)"
  11 //config:       default y
  12 //config:       help
  13 //config:       chown is used to change the user and/or group ownership
  14 //config:       of files.
  15 //config:
  16 //config:config FEATURE_CHOWN_LONG_OPTIONS
  17 //config:       bool "Enable long options"
  18 //config:       default y
  19 //config:       depends on CHOWN && LONG_OPTS
  20
  21 //applet:IF_CHOWN(APPLET_NOEXEC(chown, chown, BB_DIR_BIN, BB_SUID_DROP, chown))
  22
  23 //kbuild:lib-$(CONFIG_CHOWN) += chown.o
  24
  25 /* BB_AUDIT SUSv3 defects - none? */
  26 /* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */
  27
  28 //usage:#define chown_trivial_usage
  29 //usage:       "[-Rh"IF_DESKTOP("LHPcvf")"]... USER[:[GRP]] FILE..."
  30 //usage:#define chown_full_usage "\n\n"
  31 //usage:       "Change the owner and/or group of FILEs to USER and/or GRP"
  32 //usage:     "\n"
  33 //usage:     "\n        -h      Affect symlinks instead of symlink targets"
  34 //usage:        IF_DESKTOP(
  35 //usage:     "\n        -L      Traverse all symlinks to directories"
  36 //usage:     "\n        -H      Traverse symlinks on command line only"
  37 //usage:     "\n        -P      Don't traverse symlinks (default)"
  38 //usage:        )
  39 //next 4 options are the same for chmod/chown/chgrp:
  40 //usage:     "\n        -R      Recurse"
  41 //usage:        IF_DESKTOP(
  42 //usage:     "\n        -c      List changed files"
  43 //usage:     "\n        -v      Verbose"
  44 //usage:     "\n        -f      Hide errors"
  45 //usage:        )
  46 //usage:
  47 //usage:#define chown_example_usage
  48 //usage:       "$ ls -l /tmp/foo\n"
  49 //usage:       "-r--r--r--    1 andersen andersen        0 Apr 12 18:25 /tmp/foo\n"
  50 //usage:       "$ chown root /tmp/foo\n"
  51 //usage:       "$ ls -l /tmp/foo\n"
  52 //usage:       "-r--r--r--    1 root     andersen        0 Apr 12 18:25 /tmp/foo\n"
  53 //usage:       "$ chown root.root /tmp/foo\n"
  54 //usage:       "ls -l /tmp/foo\n"
  55 //usage:       "-r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo\n"
  56
  57 #include "libbb.h"
  58
  59 /* This is a NOEXEC applet. Be very careful! */
  60
  61
  62 #define OPT_STR     "Rh" IF_DESKTOP("vcfLHP")
  63 #define BIT_RECURSE 1
  64 #define OPT_RECURSE (opt & 1)
  65 #define OPT_NODEREF (opt & 2)
  66 #define OPT_VERBOSE (IF_DESKTOP(opt & 0x04) IF_NOT_DESKTOP(0))
  67 #define OPT_CHANGED (IF_DESKTOP(opt & 0x08) IF_NOT_DESKTOP(0))
  68 #define OPT_QUIET   (IF_DESKTOP(opt & 0x10) IF_NOT_DESKTOP(0))
  69 /* POSIX options
  70  * -L traverse every symbolic link to a directory encountered
  71  * -H if a command line argument is a symbolic link to a directory, traverse it
  72  * -P do not traverse any symbolic links (default)
  73  * We do not conform to the following:
  74  * "Specifying more than one of -H, -L, and -P is not an error.
  75  * The last option specified shall determine the behavior of the utility." */
  76 /* -L */
  77 #define BIT_TRAVERSE 0x20
  78 #define OPT_TRAVERSE (IF_DESKTOP(opt & BIT_TRAVERSE) IF_NOT_DESKTOP(0))
  79 /* -H or -L */
  80 #define BIT_TRAVERSE_TOP (0x20|0x40)
  81 #define OPT_TRAVERSE_TOP (IF_DESKTOP(opt & BIT_TRAVERSE_TOP) IF_NOT_DESKTOP(0))
  82
  83 #if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
  84 static const char chown_longopts[] ALIGN1 =
  85         "recursive\0"        No_argument   "R"
  86         "dereference\0"      No_argument   "\xff"
  87         "no-dereference\0"   No_argument   "h"
  88 # if ENABLE_DESKTOP
  89         "changes\0"          No_argument   "c"
  90         "silent\0"           No_argument   "f"
  91         "quiet\0"            No_argument   "f"
  92         "verbose\0"          No_argument   "v"
  93 # endif
  94         ;
  95 #endif
  96
  97 typedef int (*chown_fptr)(const char *, uid_t, gid_t);
  98
  99 struct param_t {
 100         struct bb_uidgid_t ugid;
 101         chown_fptr chown_func;
 102 };
 103
 104 static int FAST_FUNC fileAction(struct recursive_state *state UNUSED_PARAM,
 105                 const char *fileName, struct stat *statbuf)
 106 {
 107 #define param  (*(struct param_t*)state->userData)
 108 #define opt option_mask32
 109         uid_t u = (param.ugid.uid == (uid_t)-1L) ? statbuf->st_uid : param.ugid.uid;
 110         gid_t g = (param.ugid.gid == (gid_t)-1L) ? statbuf->st_gid : param.ugid.gid;
 111
 112         if (param.chown_func(fileName, u, g) == 0) {
 113                 if (OPT_VERBOSE
 114                  || (OPT_CHANGED && (statbuf->st_uid != u || statbuf->st_gid != g))
 115                 ) {
 116                         printf("changed ownership of '%s' to %u:%u\n",
 117                                         fileName, (unsigned)u, (unsigned)g);
 118                 }
 119                 return TRUE;
 120         }
 121         if (!OPT_QUIET)
 122                 bb_simple_perror_msg(fileName);
 123         return FALSE;
 124 #undef opt
 125 #undef param
 126 }
 127
 128 int chown_main(int argc UNUSED_PARAM, char **argv)
 129 {
 130         int retval = EXIT_SUCCESS;
 131         int opt, flags;
 132         struct param_t param;
 133
 134 #if ENABLE_FEATURE_CHOWN_LONG_OPTIONS
 135         opt = getopt32long(argv, "^" OPT_STR "\0" "-2", chown_longopts);
 136 #else
 137         opt = getopt32(argv, "^" OPT_STR "\0" "-2");
 138 #endif
 139         argv += optind;
 140
 141         /* This matches coreutils behavior (almost - see below) */
 142         param.chown_func = chown;
 143         if (OPT_NODEREF
 144         /* || (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
 145         IF_DESKTOP( || (opt & (BIT_RECURSE|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
 146         ) {
 147                 param.chown_func = lchown;
 148         }
 149
 150         flags = ACTION_DEPTHFIRST; /* match coreutils order */
 151         if (OPT_RECURSE)
 152                 flags |= ACTION_RECURSE;
 153         if (OPT_TRAVERSE_TOP)
 154                 flags |= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */
 155         if (OPT_TRAVERSE)
 156                 flags |= ACTION_FOLLOWLINKS; /* follow links if -L */
 157
 158         parse_chown_usergroup_or_die(&param.ugid, argv[0]);
 159
 160         /* Ok, ready to do the deed now */
 161         while (*++argv) {
 162                 if (!recursive_action(*argv,
 163                                 flags,          /* flags */
 164                                 fileAction,     /* file action */
 165                                 fileAction,     /* dir action */
 166                                 &param)         /* user data */
 167                 ) {
 168                         retval = EXIT_FAILURE;
 169                 }
 170         }
 171
 172         return retval;
 173 }
 174
 175 /*
 176 Testcase. Run in empty directory.
 177
 178 #!/bin/sh
 179 t1="/tmp/busybox chown"
 180 t2="/usr/bin/chown"
 181 create() {
 182     rm -rf $1; mkdir $1
 183     (
 184     cd $1 || exit 1
 185     mkdir dir dir2
 186     >up
 187     >file
 188     >dir/file
 189     >dir2/file
 190     ln -s dir linkdir
 191     ln -s file linkfile
 192     ln -s ../up dir/linkup
 193     ln -s ../dir2 dir/linkupdir2
 194     )
 195     chown -R 0:0 $1
 196 }
 197 tst() {
 198     create test1
 199     create test2
 200     echo "[$1]" >>test1.out
 201     echo "[$1]" >>test2.out
 202     (cd test1; $t1 $1) >>test1.out 2>&1
 203     (cd test2; $t2 $1) >>test2.out 2>&1
 204     (cd test1; ls -lnR) >out1
 205     (cd test2; ls -lnR) >out2
 206     echo "chown $1" >out.diff
 207     if ! diff -u out1 out2 >>out.diff; then exit 1; fi
 208     rm out.diff
 209 }
 210 tst_for_each() {
 211     tst "$1 1:1 file"
 212     tst "$1 1:1 dir"
 213     tst "$1 1:1 linkdir"
 214     tst "$1 1:1 linkfile"
 215 }
 216 echo "If script produced 'out.diff' file, then at least one testcase failed"
 217 >test1.out
 218 >test2.out
 219 # These match coreutils 6.8:
 220 tst_for_each "-v"
 221 tst_for_each "-vR"
 222 tst_for_each "-vRP"
 223 tst_for_each "-vRL"
 224 tst_for_each "-vRH"
 225 tst_for_each "-vh"
 226 tst_for_each "-vhR"
 227 tst_for_each "-vhRP"
 228 tst_for_each "-vhRL"
 229 tst_for_each "-vhRH"
 230 # Fix `name' in coreutils output
 231 sed 's/`/'"'"'/g' -i test2.out
 232 # Compare us with coreutils output
 233 diff -u test1.out test2.out
 234
 235 */