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 source tree.
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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 FAST_FUNC bb_make_directory(char *path, long mode, int flags)
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30 | {
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31 | mode_t cur_mask;
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32 | mode_t org_mask;
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33 | const char *fail_msg;
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34 | char *s;
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35 | char c;
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36 | struct stat st;
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37 |
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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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41 |
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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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46 |
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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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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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54 | c = *s; /* Save the current char */
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55 | *s = '\0'; /* and replace it with nul */
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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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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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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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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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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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98 | * this is not an error condition. */
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99 | if (!c) {
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100 | goto ret0;
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101 | }
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102 | }
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103 |
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104 | if (!c) {
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105 | /* Done. If necessary, update perms on the newly
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106 | * created directory. Failure to update here _is_
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107 | * an error. */
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108 | if ((mode != -1) && (chmod(path, mode) < 0)) {
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109 | fail_msg = "set permissions of";
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110 | break;
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111 | }
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112 | goto ret0;
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113 | }
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114 |
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115 | /* Remove any inserted nul from the path (recursive mode) */
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116 | *s = c;
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117 | } /* while (1) */
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118 |
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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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129 | }
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