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 tarball for details.
   8  */
   9
  10 /* BB_AUDIT SUSv3 defects - none? */
  11 /* BB_AUDIT GNU defects - unsupported long options. */
  12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */
  13
  14 #include "libbb.h"
  15
  16 /* This is a NOEXEC applet. Be very careful! */
  17
  18
  19 #define OPT_STR     ("Rh" USE_DESKTOP("vcfLHP"))
  20 #define BIT_RECURSE 1
  21 #define OPT_RECURSE (opt & 1)
  22 #define OPT_NODEREF (opt & 2)
  23 #define OPT_VERBOSE (USE_DESKTOP(opt & 0x04) SKIP_DESKTOP(0))
  24 #define OPT_CHANGED (USE_DESKTOP(opt & 0x08) SKIP_DESKTOP(0))
  25 #define OPT_QUIET   (USE_DESKTOP(opt & 0x10) SKIP_DESKTOP(0))
  26 /* POSIX options
  27  * -L traverse every symbolic link to a directory encountered
  28  * -H if a command line argument is a symbolic link to a directory, traverse it
  29  * -P do not traverse any symbolic links (default)
  30  * We do not conform to the following:
  31  * "Specifying more than one of -H, -L, and -P is not an error.
  32  * The last option specified shall determine the behavior of the utility." */
  33 /* -L */
  34 #define BIT_TRAVERSE 0x20
  35 #define OPT_TRAVERSE (USE_DESKTOP(opt & BIT_TRAVERSE) SKIP_DESKTOP(0))
  36 /* -H or -L */
  37 #define BIT_TRAVERSE_TOP (0x20|0x40)
  38 #define OPT_TRAVERSE_TOP (USE_DESKTOP(opt & BIT_TRAVERSE_TOP) SKIP_DESKTOP(0))
  39
  40 typedef int (*chown_fptr)(const char *, uid_t, gid_t);
  41
  42 struct param_t {
  43         struct bb_uidgid_t ugid;
  44         chown_fptr chown_func;
  45 };
  46
  47 static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf,
  48                 void *vparam, int depth UNUSED_PARAM)
  49 {
  50 #define param  (*(struct param_t*)vparam)
  51 #define opt option_mask32
  52         uid_t u = (param.ugid.uid == (uid_t)-1) ? statbuf->st_uid : param.ugid.uid;
  53         gid_t g = (param.ugid.gid == (gid_t)-1) ? statbuf->st_gid : param.ugid.gid;
  54
  55         if (param.chown_func(fileName, u, g) == 0) {
  56                 if (OPT_VERBOSE
  57                  || (OPT_CHANGED && (statbuf->st_uid != u || statbuf->st_gid != g))
  58                 ) {
  59                         printf("changed ownership of '%s' to %u:%u\n",
  60                                         fileName, (unsigned)u, (unsigned)g);
  61                 }
  62                 return TRUE;
  63         }
  64         if (!OPT_QUIET)
  65                 bb_simple_perror_msg(fileName); /* A filename can have % in it... */
  66         return FALSE;
  67 #undef opt
  68 #undef param
  69 }
  70
  71 int chown_main(int argc UNUSED_PARAM, char **argv)
  72 {
  73         int retval = EXIT_SUCCESS;
  74         int opt, flags;
  75         struct param_t param;
  76
  77         param.ugid.uid = -1;
  78         param.ugid.gid = -1;
  79         param.chown_func = chown;
  80
  81         opt_complementary = "-2";
  82         opt = getopt32(argv, OPT_STR);
  83         argv += optind;
  84
  85         /* This matches coreutils behavior (almost - see below) */
  86         if (OPT_NODEREF
  87             /* || (OPT_RECURSE && !OPT_TRAVERSE_TOP): */
  88             USE_DESKTOP( || (opt & (BIT_RECURSE|BIT_TRAVERSE_TOP)) == BIT_RECURSE)
  89         ) {
  90                 param.chown_func = lchown;
  91         }
  92
  93         flags = ACTION_DEPTHFIRST; /* match coreutils order */
  94         if (OPT_RECURSE)
  95                 flags |= ACTION_RECURSE;
  96         if (OPT_TRAVERSE_TOP)
  97                 flags |= ACTION_FOLLOWLINKS_L0; /* -H/-L: follow links on depth 0 */
  98         if (OPT_TRAVERSE)
  99                 flags |= ACTION_FOLLOWLINKS; /* follow links if -L */
 100
 101         parse_chown_usergroup_or_die(&param.ugid, argv[0]);
 102
 103         /* Ok, ready to do the deed now */
 104         argv++;
 105         do {
 106                 if (!recursive_action(*argv,
 107                                 flags,          /* flags */
 108                                 fileAction,     /* file action */
 109                                 fileAction,     /* dir action */
 110                                 &param,         /* user data */
 111                                 0)              /* depth */
 112                 ) {
 113                         retval = EXIT_FAILURE;
 114                 }
 115         } while (*++argv);
 116
 117         return retval;
 118 }
 119
 120 /*
 121 Testcase. Run in empty directory.
 122
 123 #!/bin/sh
 124 t1="/tmp/busybox chown"
 125 t2="/usr/bin/chown"
 126 create() {
 127     rm -rf $1; mkdir $1
 128     (
 129     cd $1 || exit 1
 130     mkdir dir dir2
 131     >up
 132     >file
 133     >dir/file
 134     >dir2/file
 135     ln -s dir linkdir
 136     ln -s file linkfile
 137     ln -s ../up dir/linkup
 138     ln -s ../dir2 dir/linkupdir2
 139     )
 140     chown -R 0:0 $1
 141 }
 142 tst() {
 143     create test1
 144     create test2
 145     echo "[$1]" >>test1.out
 146     echo "[$1]" >>test2.out
 147     (cd test1; $t1 $1) >>test1.out 2>&1
 148     (cd test2; $t2 $1) >>test2.out 2>&1
 149     (cd test1; ls -lnR) >out1
 150     (cd test2; ls -lnR) >out2
 151     echo "chown $1" >out.diff
 152     if ! diff -u out1 out2 >>out.diff; then exit 1; fi
 153     rm out.diff
 154 }
 155 tst_for_each() {
 156     tst "$1 1:1 file"
 157     tst "$1 1:1 dir"
 158     tst "$1 1:1 linkdir"
 159     tst "$1 1:1 linkfile"
 160 }
 161 echo "If script produced 'out.diff' file, then at least one testcase failed"
 162 >test1.out
 163 >test2.out
 164 # These match coreutils 6.8:
 165 tst_for_each "-v"
 166 tst_for_each "-vR"
 167 tst_for_each "-vRP"
 168 tst_for_each "-vRL"
 169 tst_for_each "-vRH"
 170 tst_for_each "-vh"
 171 tst_for_each "-vhR"
 172 tst_for_each "-vhRP"
 173 tst_for_each "-vhRL"
 174 tst_for_each "-vhRH"
 175 # Fix `name' in coreutils output
 176 sed 's/`/'"'"'/g' -i test2.out
 177 # Compare us with coreutils output
 178 diff -u test1.out test2.out
 179
 180 */