source: branches/3.2/mindi-busybox/coreutils/chmod.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 4.9 KB
Line 
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 source tree.
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//usage:#define chmod_trivial_usage
18//usage:       "[-R"IF_DESKTOP("cvf")"] MODE[,MODE]... FILE..."
19//usage:#define chmod_full_usage "\n\n"
20//usage:       "Each MODE is one or more of the letters ugoa, one of the\n"
21//usage:       "symbols +-= and one or more of the letters rwxst\n"
22//usage:     "\n    -R  Recurse"
23//usage:    IF_DESKTOP(
24//usage:     "\n    -c  List changed files"
25//usage:     "\n    -v  List all files"
26//usage:     "\n    -f  Hide errors"
27//usage:    )
28//usage:
29//usage:#define chmod_example_usage
30//usage:       "$ ls -l /tmp/foo\n"
31//usage:       "-rw-rw-r--    1 root     root            0 Apr 12 18:25 /tmp/foo\n"
32//usage:       "$ chmod u+x /tmp/foo\n"
33//usage:       "$ ls -l /tmp/foo\n"
34//usage:       "-rwxrw-r--    1 root     root            0 Apr 12 18:25 /tmp/foo*\n"
35//usage:       "$ chmod 444 /tmp/foo\n"
36//usage:       "$ ls -l /tmp/foo\n"
37//usage:       "-r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo\n"
38
39#include "libbb.h"
40
41/* This is a NOEXEC applet. Be very careful! */
42
43
44#define OPT_RECURSE (option_mask32 & 1)
45#define OPT_VERBOSE (IF_DESKTOP(option_mask32 & 2) IF_NOT_DESKTOP(0))
46#define OPT_CHANGED (IF_DESKTOP(option_mask32 & 4) IF_NOT_DESKTOP(0))
47#define OPT_QUIET   (IF_DESKTOP(option_mask32 & 8) IF_NOT_DESKTOP(0))
48#define OPT_STR     "R" IF_DESKTOP("vcf")
49
50/* coreutils:
51 * chmod never changes the permissions of symbolic links; the chmod
52 * system call cannot change their permissions. This is not a problem
53 * since the permissions of symbolic links are never used.
54 * However, for each symbolic link listed on the command line, chmod changes
55 * the permissions of the pointed-to file. In contrast, chmod ignores
56 * symbolic links encountered during recursive directory traversals.
57 */
58
59static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
60{
61    mode_t newmode;
62
63    /* match coreutils behavior */
64    if (depth == 0) {
65        /* statbuf holds lstat result, but we need stat (follow link) */
66        if (stat(fileName, statbuf))
67            goto err;
68    } else { /* depth > 0: skip links */
69        if (S_ISLNK(statbuf->st_mode))
70            return TRUE;
71    }
72    newmode = statbuf->st_mode;
73
74    if (!bb_parse_mode((char *)param, &newmode))
75        bb_error_msg_and_die("invalid mode '%s'", (char *)param);
76
77    if (chmod(fileName, newmode) == 0) {
78        if (OPT_VERBOSE
79         || (OPT_CHANGED && statbuf->st_mode != newmode)
80        ) {
81            printf("mode of '%s' changed to %04o (%s)\n", fileName,
82                newmode & 07777, bb_mode_string(newmode)+1);
83        }
84        return TRUE;
85    }
86 err:
87    if (!OPT_QUIET)
88        bb_simple_perror_msg(fileName);
89    return FALSE;
90}
91
92int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
93int chmod_main(int argc UNUSED_PARAM, char **argv)
94{
95    int retval = EXIT_SUCCESS;
96    char *arg, **argp;
97    char *smode;
98
99    /* Convert first encountered -r into ar, -w into aw etc
100     * so that getopt would not eat it */
101    argp = argv;
102    while ((arg = *++argp)) {
103        /* Mode spec must be the first arg (sans -R etc) */
104        /* (protect against mishandling e.g. "chmod 644 -r") */
105        if (arg[0] != '-') {
106            arg = NULL;
107            break;
108        }
109        /* An option. Not a -- or valid option? */
110        if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
111            arg[0] = 'a';
112            break;
113        }
114    }
115
116    /* Parse options */
117    opt_complementary = "-2";
118    getopt32(argv, ("-"OPT_STR) + 1); /* Reuse string */
119    argv += optind;
120
121    /* Restore option-like mode if needed */
122    if (arg) arg[0] = '-';
123
124    /* Ok, ready to do the deed now */
125    smode = *argv++;
126    do {
127        if (!recursive_action(*argv,
128            OPT_RECURSE,    // recurse
129            fileAction,     // file action
130            fileAction,     // dir action
131            smode,          // user data
132            0)              // depth
133        ) {
134            retval = EXIT_FAILURE;
135        }
136    } while (*++argv);
137
138    return retval;
139}
140
141/*
142Security: chmod is too important and too subtle.
143This is a test script (busybox chmod versus coreutils).
144Run it in empty directory.
145
146#!/bin/sh
147t1="/tmp/busybox chmod"
148t2="/usr/bin/chmod"
149create() {
150    rm -rf $1; mkdir $1
151    (
152    cd $1 || exit 1
153    mkdir dir
154    >up
155    >file
156    >dir/file
157    ln -s dir linkdir
158    ln -s file linkfile
159    ln -s ../up dir/up
160    )
161}
162tst() {
163    (cd test1; $t1 $1)
164    (cd test2; $t2 $1)
165    (cd test1; ls -lR) >out1
166    (cd test2; ls -lR) >out2
167    echo "chmod $1" >out.diff
168    if ! diff -u out1 out2 >>out.diff; then exit 1; fi
169    rm out.diff
170}
171echo "If script produced 'out.diff' file, then at least one testcase failed"
172create test1; create test2
173tst "a+w file"
174tst "a-w dir"
175tst "a+w linkfile"
176tst "a-w linkdir"
177tst "-R a+w file"
178tst "-R a-w dir"
179tst "-R a+w linkfile"
180tst "-R a-w linkdir"
181tst "a-r,a+x linkfile"
182*/
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