Contents of /tags/mkinitrd-6_1_3/busybox/coreutils/chmod.c
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 4083 byte(s)
tagged 'mkinitrd-6_1_3'
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 (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0)) |
24 | #define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0)) |
25 | #define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0)) |
26 | #define OPT_STR "R" USE_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 | */ |