blob: a6b7c28df06c7366afc51d3a2ce528f3b8858be5
| 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 | |
| 10 | /* Mar 5, 2003 Manuel Novoa III |
| 11 | * |
| 12 | * This is the main work function for the 'mkdir' applet. As such, it |
| 13 | * strives to be SUSv3 compliant in it's behaviour when recursively |
| 14 | * making missing parent dirs, and in it's mode setting of the final |
| 15 | * directory 'path'. |
| 16 | * |
| 17 | * To recursively build all missing intermediate directories, make |
| 18 | * sure that (flags & FILEUTILS_RECUR) is non-zero. Newly created |
| 19 | * intermediate directories will have at least u+wx perms. |
| 20 | * |
| 21 | * To set specific permissions on 'path', pass the appropriate 'mode' |
| 22 | * val. Otherwise, pass -1 to get default permissions. |
| 23 | */ |
| 24 | |
| 25 | #include "libbb.h" |
| 26 | |
| 27 | /* This function is used from NOFORK applets. It must not allocate anything */ |
| 28 | |
| 29 | int FAST_FUNC bb_make_directory(char *path, long mode, int flags) |
| 30 | { |
| 31 | mode_t cur_mask; |
| 32 | mode_t org_mask; |
| 33 | const char *fail_msg; |
| 34 | char *s; |
| 35 | char c; |
| 36 | struct stat st; |
| 37 | |
| 38 | /* "path" can be a result of dirname(). |
| 39 | * dirname("no_slashes") returns ".", possibly read-only. |
| 40 | * musl dirname() can return read-only "/" too. |
| 41 | * We need writable string. And for "/", "." (and ".."?) |
| 42 | * nothing needs to be created anyway. |
| 43 | */ |
| 44 | if (LONE_CHAR(path, '/')) |
| 45 | return 0; |
| 46 | if (path[0] == '.') { |
| 47 | if (path[1] == '\0') |
| 48 | return 0; /* "." */ |
| 49 | // if (path[1] == '.' && path[2] == '\0') |
| 50 | // return 0; /* ".." */ |
| 51 | } |
| 52 | |
| 53 | org_mask = cur_mask = (mode_t)-1L; |
| 54 | s = path; |
| 55 | while (1) { |
| 56 | c = '\0'; |
| 57 | |
| 58 | if (flags & FILEUTILS_RECUR) { /* Get the parent */ |
| 59 | /* Bypass leading non-'/'s and then subsequent '/'s */ |
| 60 | while (*s) { |
| 61 | if (*s == '/') { |
| 62 | do { |
| 63 | ++s; |
| 64 | } while (*s == '/'); |
| 65 | c = *s; /* Save the current char */ |
| 66 | *s = '\0'; /* and replace it with nul */ |
| 67 | break; |
| 68 | } |
| 69 | ++s; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | if (c != '\0') { |
| 74 | /* Intermediate dirs: must have wx for user */ |
| 75 | if (cur_mask == (mode_t)-1L) { /* wasn't done yet? */ |
| 76 | mode_t new_mask; |
| 77 | org_mask = umask(0); |
| 78 | cur_mask = 0; |
| 79 | /* Clear u=wx in umask - this ensures |
| 80 | * they won't be cleared on mkdir */ |
| 81 | new_mask = (org_mask & ~(mode_t)0300); |
| 82 | //bb_error_msg("org_mask:%o cur_mask:%o", org_mask, new_mask); |
| 83 | if (new_mask != cur_mask) { |
| 84 | cur_mask = new_mask; |
| 85 | umask(new_mask); |
| 86 | } |
| 87 | } |
| 88 | } else { |
| 89 | /* Last component: uses original umask */ |
| 90 | //bb_error_msg("1 org_mask:%o", org_mask); |
| 91 | if (org_mask != cur_mask) { |
| 92 | cur_mask = org_mask; |
| 93 | umask(org_mask); |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | if (mkdir(path, 0777) < 0) { |
| 98 | /* If we failed for any other reason than the directory |
| 99 | * already exists, output a diagnostic and return -1 */ |
| 100 | if ((errno != EEXIST && errno != EISDIR) |
| 101 | || !(flags & FILEUTILS_RECUR) |
| 102 | || ((stat(path, &st) < 0) || !S_ISDIR(st.st_mode)) |
| 103 | ) { |
| 104 | fail_msg = "create"; |
| 105 | break; |
| 106 | } |
| 107 | /* Since the directory exists, don't attempt to change |
| 108 | * permissions if it was the full target. Note that |
| 109 | * this is not an error condition. */ |
| 110 | if (!c) { |
| 111 | goto ret0; |
| 112 | } |
| 113 | } else { |
| 114 | if (flags & FILEUTILS_VERBOSE) { |
| 115 | printf("created directory: '%s'\n", path); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | if (!c) { |
| 120 | /* Done. If necessary, update perms on the newly |
| 121 | * created directory. Failure to update here _is_ |
| 122 | * an error. */ |
| 123 | if ((mode != -1) && (chmod(path, mode) < 0)) { |
| 124 | fail_msg = "set permissions of"; |
| 125 | if (flags & FILEUTILS_IGNORE_CHMOD_ERR) { |
| 126 | flags = 0; |
| 127 | goto print_err; |
| 128 | } |
| 129 | break; |
| 130 | } |
| 131 | goto ret0; |
| 132 | } |
| 133 | |
| 134 | /* Remove any inserted nul from the path (recursive mode) */ |
| 135 | *s = c; |
| 136 | } /* while (1) */ |
| 137 | |
| 138 | flags = -1; |
| 139 | print_err: |
| 140 | bb_perror_msg("can't %s directory '%s'", fail_msg, path); |
| 141 | goto ret; |
| 142 | ret0: |
| 143 | flags = 0; |
| 144 | ret: |
| 145 | //bb_error_msg("2 org_mask:%o", org_mask); |
| 146 | if (org_mask != cur_mask) |
| 147 | umask(org_mask); |
| 148 | return flags; |
| 149 | } |
| 150 |