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

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 4008 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    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 "busybox.h"
    18
    19 #define OPT_RECURSE (option_mask32 & 1)
    20 #define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
    21 #define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
    22 #define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
    23 #define OPT_STR "R" USE_DESKTOP("vcf")
    24
    25 /* coreutils:
    26 * chmod never changes the permissions of symbolic links; the chmod
    27 * system call cannot change their permissions. This is not a problem
    28 * since the permissions of symbolic links are never used.
    29 * However, for each symbolic link listed on the command line, chmod changes
    30 * the permissions of the pointed-to file. In contrast, chmod ignores
    31 * symbolic links encountered during recursive directory traversals.
    32 */
    33
    34 static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth)
    35 {
    36 mode_t newmode;
    37
    38 /* match coreutils behavior */
    39 if (depth == 0) {
    40 /* statbuf holds lstat result, but we need stat (follow link) */
    41 if (stat(fileName, statbuf))
    42 goto err;
    43 } else { /* depth > 0: skip links */
    44 if (S_ISLNK(statbuf->st_mode))
    45 return TRUE;
    46 }
    47 newmode = statbuf->st_mode;
    48
    49 if (!bb_parse_mode((char *)junk, &newmode))
    50 bb_error_msg_and_die("invalid mode: %s", (char *)junk);
    51
    52 if (chmod(fileName, newmode) == 0) {
    53 if (OPT_VERBOSE
    54 || (OPT_CHANGED && statbuf->st_mode != newmode)
    55 ) {
    56 printf("mode of '%s' changed to %04o (%s)\n", fileName,
    57 newmode & 07777, bb_mode_string(newmode)+1);
    58 }
    59 return TRUE;
    60 }
    61 err:
    62 if (!OPT_QUIET)
    63 bb_perror_msg("%s", fileName);
    64 return FALSE;
    65 }
    66
    67 int chmod_main(int argc, char **argv)
    68 {
    69 int retval = EXIT_SUCCESS;
    70 char *arg, **argp;
    71 char *smode;
    72
    73 /* Convert first encountered -r into ar, -w into aw etc
    74 * so that getopt would not eat it */
    75 argp = argv;
    76 while ((arg = *++argp)) {
    77 /* Mode spec must be the first arg (sans -R etc) */
    78 /* (protect against mishandling e.g. "chmod 644 -r") */
    79 if (arg[0] != '-') {
    80 arg = NULL;
    81 break;
    82 }
    83 /* An option. Not a -- or valid option? */
    84 if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
    85 arg[0] = 'a';
    86 break;
    87 }
    88 }
    89
    90 /* Parse options */
    91 opt_complementary = "-2";
    92 getopt32(argc, argv, ("-"OPT_STR) + 1); /* Reuse string */
    93 argv += optind;
    94
    95 /* Restore option-like mode if needed */
    96 if (arg) arg[0] = '-';
    97
    98 /* Ok, ready to do the deed now */
    99 smode = *argv++;
    100 do {
    101 if (!recursive_action(*argv,
    102 OPT_RECURSE, // recurse
    103 FALSE, // follow links: coreutils doesn't
    104 FALSE, // depth first
    105 fileAction, // file action
    106 fileAction, // dir action
    107 smode, // user data
    108 0) // depth
    109 ) {
    110 retval = EXIT_FAILURE;
    111 }
    112 } while (*++argv);
    113
    114 return retval;
    115 }
    116
    117 /*
    118 Security: chmod is too important and too subtle.
    119 This is a test script (busybox chmod versus coreutils).
    120 Run it in empty dir. Probably requires bash.
    121
    122 #!/bin/sh
    123 function create() {
    124 rm -rf $1; mkdir $1
    125 (
    126 cd $1 || exit 1
    127 mkdir dir
    128 >up
    129 >file
    130 >dir/file
    131 ln -s dir linkdir
    132 ln -s file linkfile
    133 ln -s ../up dir/up
    134 )
    135 }
    136 function tst() {
    137 (cd test1; $t1 $1)
    138 (cd test2; $t2 $1)
    139 (cd test1; ls -lR) >out1
    140 (cd test2; ls -lR) >out2
    141 echo "chmod $1" >out.diff
    142 if ! diff -u out1 out2 >>out.diff; then exit 1; fi
    143 mv out.diff out1.diff
    144 }
    145 t1="/tmp/busybox chmod"
    146 t2="/usr/bin/chmod"
    147 create test1; create test2
    148 tst "a+w file"
    149 tst "a-w dir"
    150 tst "a+w linkfile"
    151 tst "a-w linkdir"
    152 tst "-R a+w file"
    153 tst "-R a-w dir"
    154 tst "-R a+w linkfile"
    155 tst "-R a-w linkdir"
    156 tst "a-r,a+x linkfile"
    157 */