diff options
Diffstat (limited to 'coreutils/chmod.c')
-rw-r--r-- | coreutils/chmod.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/coreutils/chmod.c b/coreutils/chmod.c new file mode 100644 index 000000000..990e9b4ce --- /dev/null +++ b/coreutils/chmod.c | |||
@@ -0,0 +1,157 @@ | |||
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 | */ | ||