[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * parse_mode implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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| 6 | *
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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 8 | */
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| 9 |
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| 10 | /* Mar 5, 2003 Manuel Novoa III
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| 11 | *
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| 12 | * This is the main work function for the 'mkdir' applet. As such, it
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| 13 | * strives to be SUSv3 compliant in it's behaviour when recursively
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| 14 | * making missing parent dirs, and in it's mode setting of the final
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| 15 | * directory 'path'.
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| 16 | *
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| 17 | * To recursively build all missing intermediate directories, make
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| 18 | * sure that (flags & FILEUTILS_RECUR) is non-zero. Newly created
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| 19 | * intermediate directories will have at least u+wx perms.
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| 20 | *
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| 21 | * To set specific permissions on 'path', pass the appropriate 'mode'
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| 22 | * val. Otherwise, pass -1 to get default permissions.
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| 23 | */
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| 24 |
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| 25 | #include "libbb.h"
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| 26 |
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[1765] | 27 | /* This function is used from NOFORK applets. It must not allocate anything */
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| 28 |
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[2725] | 29 | int FAST_FUNC bb_make_directory(char *path, long mode, int flags)
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[821] | 30 | {
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[2725] | 31 | mode_t cur_mask;
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| 32 | mode_t org_mask;
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[821] | 33 | const char *fail_msg;
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[2725] | 34 | char *s;
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[821] | 35 | char c;
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| 36 | struct stat st;
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| 37 |
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[2725] | 38 | /* Happens on bb_make_directory(dirname("no_slashes"),...) */
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| 39 | if (LONE_CHAR(path, '.'))
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| 40 | return 0;
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[821] | 41 |
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[2725] | 42 | org_mask = cur_mask = (mode_t)-1L;
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| 43 | s = path;
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| 44 | while (1) {
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| 45 | c = '\0';
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[821] | 46 |
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[2725] | 47 | if (flags & FILEUTILS_RECUR) { /* Get the parent */
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| 48 | /* Bypass leading non-'/'s and then subsequent '/'s */
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[821] | 49 | while (*s) {
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| 50 | if (*s == '/') {
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| 51 | do {
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| 52 | ++s;
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| 53 | } while (*s == '/');
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[2725] | 54 | c = *s; /* Save the current char */
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| 55 | *s = '\0'; /* and replace it with nul */
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[821] | 56 | break;
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| 57 | }
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| 58 | ++s;
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| 59 | }
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| 60 | }
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| 61 |
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[2725] | 62 | if (c != '\0') {
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| 63 | /* Intermediate dirs: must have wx for user */
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| 64 | if (cur_mask == (mode_t)-1L) { /* wasn't done yet? */
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| 65 | mode_t new_mask;
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| 66 | org_mask = umask(0);
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| 67 | cur_mask = 0;
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| 68 | /* Clear u=wx in umask - this ensures
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| 69 | * they won't be cleared on mkdir */
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| 70 | new_mask = (org_mask & ~(mode_t)0300);
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| 71 | //bb_error_msg("org_mask:%o cur_mask:%o", org_mask, new_mask);
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| 72 | if (new_mask != cur_mask) {
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| 73 | cur_mask = new_mask;
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| 74 | umask(new_mask);
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| 75 | }
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| 76 | }
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| 77 | } else {
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| 78 | /* Last component: uses original umask */
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| 79 | //bb_error_msg("1 org_mask:%o", org_mask);
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| 80 | if (org_mask != cur_mask) {
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| 81 | cur_mask = org_mask;
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| 82 | umask(org_mask);
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| 83 | }
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| 84 | }
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| 85 |
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[821] | 86 | if (mkdir(path, 0777) < 0) {
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| 87 | /* If we failed for any other reason than the directory
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[2725] | 88 | * already exists, output a diagnostic and return -1 */
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| 89 | if ((errno != EEXIST && errno != EISDIR)
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| 90 | || !(flags & FILEUTILS_RECUR)
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| 91 | || ((stat(path, &st) < 0) || !S_ISDIR(st.st_mode))
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| 92 | ) {
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[821] | 93 | fail_msg = "create";
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| 94 | break;
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| 95 | }
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| 96 | /* Since the directory exists, don't attempt to change
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| 97 | * permissions if it was the full target. Note that
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[2725] | 98 | * this is not an error condition. */
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[821] | 99 | if (!c) {
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[2725] | 100 | goto ret0;
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[821] | 101 | }
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| 102 | }
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| 103 |
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| 104 | if (!c) {
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[2725] | 105 | /* Done. If necessary, update perms on the newly
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[821] | 106 | * created directory. Failure to update here _is_
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[2725] | 107 | * an error. */
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| 108 | if ((mode != -1) && (chmod(path, mode) < 0)) {
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[821] | 109 | fail_msg = "set permissions of";
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| 110 | break;
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| 111 | }
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[2725] | 112 | goto ret0;
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[821] | 113 | }
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| 114 |
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[2725] | 115 | /* Remove any inserted nul from the path (recursive mode) */
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[821] | 116 | *s = c;
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[2725] | 117 | } /* while (1) */
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[821] | 118 |
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[2725] | 119 | bb_perror_msg("can't %s directory '%s'", fail_msg, path);
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| 120 | flags = -1;
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| 121 | goto ret;
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| 122 | ret0:
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| 123 | flags = 0;
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| 124 | ret:
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| 125 | //bb_error_msg("2 org_mask:%o", org_mask);
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| 126 | if (org_mask != cur_mask)
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| 127 | umask(org_mask);
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| 128 | return flags;
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[821] | 129 | }
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