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