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 |
|
---|
59 | static 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 |
|
---|
92 | int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
93 | int 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 | /*
|
---|
142 | Security: chmod is too important and too subtle.
|
---|
143 | This is a test script (busybox chmod versus coreutils).
|
---|
144 | Run it in empty directory.
|
---|
145 |
|
---|
146 | #!/bin/sh
|
---|
147 | t1="/tmp/busybox chmod"
|
---|
148 | t2="/usr/bin/chmod"
|
---|
149 | create() {
|
---|
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 | }
|
---|
162 | tst() {
|
---|
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 | }
|
---|
171 | echo "If script produced 'out.diff' file, then at least one testcase failed"
|
---|
172 | create test1; create test2
|
---|
173 | tst "a+w file"
|
---|
174 | tst "a-w dir"
|
---|
175 | tst "a+w linkfile"
|
---|
176 | tst "a-w linkdir"
|
---|
177 | tst "-R a+w file"
|
---|
178 | tst "-R a-w dir"
|
---|
179 | tst "-R a+w linkfile"
|
---|
180 | tst "-R a-w linkdir"
|
---|
181 | tst "a-r,a+x linkfile"
|
---|
182 | */
|
---|