blob: 5ee45b94206fa9ad5a6451090234900d078ba44f
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 | */ |
183 |