| 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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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 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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| 27 | /* This function is used from NOFORK applets. It must not allocate anything */
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| 28 |
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| 29 | int bb_make_directory (char *path, long mode, int flags)
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| 30 | {
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| 31 | mode_t mask;
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| 32 | const char *fail_msg;
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| 33 | char *s = path;
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| 34 | char c;
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| 35 | struct stat st;
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| 36 |
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| 37 | mask = umask(0);
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| 38 | if (mode == -1) {
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| 39 | umask(mask);
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| 40 | mode = (S_IXUSR | S_IXGRP | S_IXOTH |
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| 41 | S_IWUSR | S_IWGRP | S_IWOTH |
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| 42 | S_IRUSR | S_IRGRP | S_IROTH) & ~mask;
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| 43 | } else {
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| 44 | umask(mask & ~0300);
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| 45 | }
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| 46 |
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| 47 | do {
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| 48 | c = 0;
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| 49 |
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| 50 | if (flags & FILEUTILS_RECUR) { /* Get the parent. */
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| 51 | /* Bypass leading non-'/'s and then subsequent '/'s. */
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| 52 | while (*s) {
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| 53 | if (*s == '/') {
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| 54 | do {
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| 55 | ++s;
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| 56 | } while (*s == '/');
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| 57 | c = *s; /* Save the current char */
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| 58 | *s = 0; /* and replace it with nul. */
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| 59 | break;
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| 60 | }
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| 61 | ++s;
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| 62 | }
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| 63 | }
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| 64 |
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| 65 | if (mkdir(path, 0777) < 0) {
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| 66 | /* If we failed for any other reason than the directory
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| 67 | * already exists, output a diagnostic and return -1.*/
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| 68 | if (errno != EEXIST
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| 69 | || !(flags & FILEUTILS_RECUR)
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| 70 | || (stat(path, &st) < 0 || !S_ISDIR(st.st_mode))) {
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| 71 | fail_msg = "create";
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| 72 | umask(mask);
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| 73 | break;
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| 74 | }
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| 75 | /* Since the directory exists, don't attempt to change
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| 76 | * permissions if it was the full target. Note that
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| 77 | * this is not an error conditon. */
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| 78 | if (!c) {
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| 79 | umask(mask);
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| 80 | return 0;
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| 81 | }
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| 82 | }
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| 83 |
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| 84 | if (!c) {
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| 85 | /* Done. If necessary, updated perms on the newly
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| 86 | * created directory. Failure to update here _is_
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| 87 | * an error.*/
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| 88 | umask(mask);
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| 89 | if ((mode != -1) && (chmod(path, mode) < 0)){
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| 90 | fail_msg = "set permissions of";
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| 91 | break;
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| 92 | }
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| 93 | return 0;
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| 94 | }
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| 95 |
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| 96 | /* Remove any inserted nul from the path (recursive mode). */
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| 97 | *s = c;
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| 98 |
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| 99 | } while (1);
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| 100 |
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| 101 | bb_perror_msg("cannot %s directory '%s'", fail_msg, path);
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| 102 | return -1;
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| 103 | }
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