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    Contents of /trunk/mkinitrd-magellan/busybox/coreutils/chmod.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 4085 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Mini chmod implementation for busybox
    4 *
    5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
    6 *
    7 * Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
    8 * to correctly parse '-rwxgoa'
    9 *
    10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    11 */
    12
    13 /* BB_AUDIT SUSv3 compliant */
    14 /* BB_AUDIT GNU defects - unsupported long options. */
    15 /* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
    16
    17 #include "libbb.h"
    18
    19 /* This is a NOEXEC applet. Be very careful! */
    20
    21
    22 #define OPT_RECURSE (option_mask32 & 1)
    23 #define OPT_VERBOSE (IF_DESKTOP(option_mask32 & 2) IF_NOT_DESKTOP(0))
    24 #define OPT_CHANGED (IF_DESKTOP(option_mask32 & 4) IF_NOT_DESKTOP(0))
    25 #define OPT_QUIET (IF_DESKTOP(option_mask32 & 8) IF_NOT_DESKTOP(0))
    26 #define OPT_STR "R" IF_DESKTOP("vcf")
    27
    28 /* coreutils:
    29 * chmod never changes the permissions of symbolic links; the chmod
    30 * system call cannot change their permissions. This is not a problem
    31 * since the permissions of symbolic links are never used.
    32 * However, for each symbolic link listed on the command line, chmod changes
    33 * the permissions of the pointed-to file. In contrast, chmod ignores
    34 * symbolic links encountered during recursive directory traversals.
    35 */
    36
    37 static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
    38 {
    39 mode_t newmode;
    40
    41 /* match coreutils behavior */
    42 if (depth == 0) {
    43 /* statbuf holds lstat result, but we need stat (follow link) */
    44 if (stat(fileName, statbuf))
    45 goto err;
    46 } else { /* depth > 0: skip links */
    47 if (S_ISLNK(statbuf->st_mode))
    48 return TRUE;
    49 }
    50 newmode = statbuf->st_mode;
    51
    52 if (!bb_parse_mode((char *)param, &newmode))
    53 bb_error_msg_and_die("invalid mode: %s", (char *)param);
    54
    55 if (chmod(fileName, newmode) == 0) {
    56 if (OPT_VERBOSE
    57 || (OPT_CHANGED && statbuf->st_mode != newmode)
    58 ) {
    59 printf("mode of '%s' changed to %04o (%s)\n", fileName,
    60 newmode & 07777, bb_mode_string(newmode)+1);
    61 }
    62 return TRUE;
    63 }
    64 err:
    65 if (!OPT_QUIET)
    66 bb_simple_perror_msg(fileName);
    67 return FALSE;
    68 }
    69
    70 int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    71 int chmod_main(int argc UNUSED_PARAM, char **argv)
    72 {
    73 int retval = EXIT_SUCCESS;
    74 char *arg, **argp;
    75 char *smode;
    76
    77 /* Convert first encountered -r into ar, -w into aw etc
    78 * so that getopt would not eat it */
    79 argp = argv;
    80 while ((arg = *++argp)) {
    81 /* Mode spec must be the first arg (sans -R etc) */
    82 /* (protect against mishandling e.g. "chmod 644 -r") */
    83 if (arg[0] != '-') {
    84 arg = NULL;
    85 break;
    86 }
    87 /* An option. Not a -- or valid option? */
    88 if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
    89 arg[0] = 'a';
    90 break;
    91 }
    92 }
    93
    94 /* Parse options */
    95 opt_complementary = "-2";
    96 getopt32(argv, ("-"OPT_STR) + 1); /* Reuse string */
    97 argv += optind;
    98
    99 /* Restore option-like mode if needed */
    100 if (arg) arg[0] = '-';
    101
    102 /* Ok, ready to do the deed now */
    103 smode = *argv++;
    104 do {
    105 if (!recursive_action(*argv,
    106 OPT_RECURSE, // recurse
    107 fileAction, // file action
    108 fileAction, // dir action
    109 smode, // user data
    110 0) // depth
    111 ) {
    112 retval = EXIT_FAILURE;
    113 }
    114 } while (*++argv);
    115
    116 return retval;
    117 }
    118
    119 /*
    120 Security: chmod is too important and too subtle.
    121 This is a test script (busybox chmod versus coreutils).
    122 Run it in empty directory.
    123
    124 #!/bin/sh
    125 t1="/tmp/busybox chmod"
    126 t2="/usr/bin/chmod"
    127 create() {
    128 rm -rf $1; mkdir $1
    129 (
    130 cd $1 || exit 1
    131 mkdir dir
    132 >up
    133 >file
    134 >dir/file
    135 ln -s dir linkdir
    136 ln -s file linkfile
    137 ln -s ../up dir/up
    138 )
    139 }
    140 tst() {
    141 (cd test1; $t1 $1)
    142 (cd test2; $t2 $1)
    143 (cd test1; ls -lR) >out1
    144 (cd test2; ls -lR) >out2
    145 echo "chmod $1" >out.diff
    146 if ! diff -u out1 out2 >>out.diff; then exit 1; fi
    147 rm out.diff
    148 }
    149 echo "If script produced 'out.diff' file, then at least one testcase failed"
    150 create test1; create test2
    151 tst "a+w file"
    152 tst "a-w dir"
    153 tst "a+w linkfile"
    154 tst "a-w linkdir"
    155 tst "-R a+w file"
    156 tst "-R a-w dir"
    157 tst "-R a+w linkfile"
    158 tst "-R a-w linkdir"
    159 tst "a-r,a+x linkfile"
    160 */