1 /* vi: set sw=4 ts=4: */
2 /*
3 * parse_mode implementation for busybox
4 *
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9 /* Mar 5, 2003 Manuel Novoa III
10 *
11 * This is the main work function for the 'mkdir' applet. As such, it
12 * strives to be SUSv3 compliant in it's behaviour when recursively
13 * making missing parent dirs, and in it's mode setting of the final
14 * directory 'path'.
15 *
16 * To recursively build all missing intermediate directories, make
17 * sure that (flags & FILEUTILS_RECUR) is non-zero. Newly created
18 * intermediate directories will have at least u+wx perms.
19 *
20 * To set specific permissions on 'path', pass the appropriate 'mode'
21 * val. Otherwise, pass -1 to get default permissions.
22 */
23 #include "libbb.h"
24
25 /* This function is used from NOFORK applets. It must not allocate anything */
26
bb_make_directory(char * path,long mode,int flags)27 int FAST_FUNC bb_make_directory(char *path, long mode, int flags)
28 {
29 mode_t cur_mask;
30 mode_t org_mask;
31 const char *fail_msg;
32 char *s;
33 char c;
34 struct stat st;
35
36 /* "path" can be a result of dirname().
37 * dirname("no_slashes") returns ".", possibly read-only.
38 * musl dirname() can return read-only "/" too.
39 * We need writable string. And for "/", "." (and ".."?)
40 * nothing needs to be created anyway.
41 */
42 if (LONE_CHAR(path, '/'))
43 return 0;
44 if (path[0] == '.') {
45 if (path[1] == '\0')
46 return 0; /* "." */
47 // if (path[1] == '.' && path[2] == '\0')
48 // return 0; /* ".." */
49 }
50
51 org_mask = cur_mask = (mode_t)-1L;
52 s = path;
53 while (1) {
54 c = '\0';
55
56 if (flags & FILEUTILS_RECUR) { /* Get the parent */
57 /* Bypass leading non-'/'s and then subsequent '/'s */
58 while (*s) {
59 if (*s == '/') {
60 do {
61 ++s;
62 } while (*s == '/');
63 c = *s; /* Save the current char */
64 *s = '\0'; /* and replace it with nul */
65 break;
66 }
67 ++s;
68 }
69 }
70
71 if (c != '\0') {
72 /* Intermediate dirs: must have wx for user */
73 if (cur_mask == (mode_t)-1L) { /* wasn't done yet? */
74 mode_t new_mask;
75 org_mask = umask(0);
76 cur_mask = 0;
77 /* Clear u=wx in umask - this ensures
78 * they won't be cleared on mkdir */
79 new_mask = (org_mask & ~(mode_t)0300);
80 //bb_error_msg("org_mask:%o cur_mask:%o", org_mask, new_mask);
81 if (new_mask != cur_mask) {
82 cur_mask = new_mask;
83 umask(new_mask);
84 }
85 }
86 } else {
87 /* Last component: uses original umask */
88 //bb_error_msg("1 org_mask:%o", org_mask);
89 if (org_mask != cur_mask) {
90 cur_mask = org_mask;
91 umask(org_mask);
92 }
93 }
94
95 //bb_error_msg("mkdir '%s'", path);
96 if (mkdir(path, 0777) < 0) {
97 /* If we failed for any other reason than the directory
98 * already exists, output a diagnostic and return -1 */
99 if ((errno != EEXIST && errno != EISDIR)
100 || !(flags & FILEUTILS_RECUR)
101 || ((stat(path, &st) < 0) || !S_ISDIR(st.st_mode))
102 ) {
103 fail_msg = "create";
104 break;
105 }
106 /* Since the directory exists, don't attempt to change
107 * permissions if it was the full target. Note that
108 * this is not an error condition. */
109 if (!c) {
110 goto ret0;
111 }
112 } else {
113 if (flags & FILEUTILS_VERBOSE) {
114 printf("created directory: '%s'\n", path);
115 }
116 }
117
118 if (!c) {
119 /* Done. If necessary, update perms on the newly
120 * created directory. Failure to update here _is_
121 * an error. */
122 if (mode != -1) {
123 //bb_error_msg("chmod 0%03lo mkdir '%s'", mode, path);
124 if (chmod(path, mode) < 0) {
125 fail_msg = "set permissions of";
126 if (flags & FILEUTILS_IGNORE_CHMOD_ERR) {
127 flags = 0;
128 goto print_err;
129 }
130 break;
131 }
132 }
133 goto ret0;
134 }
135
136 /* Remove any inserted nul from the path (recursive mode) */
137 *s = c;
138 } /* while (1) */
139
140 flags = -1;
141 print_err:
142 bb_perror_msg("can't %s directory '%s'", fail_msg, path);
143 goto ret;
144 ret0:
145 flags = 0;
146 ret:
147 //bb_error_msg("2 org_mask:%o", org_mask);
148 if (org_mask != cur_mask)
149 umask(org_mask);
150 return flags;
151 }
152