Commit | Line | Data |
---|---|---|
0f78b815 WD |
1 | /* |
2 | * Implement the core of the --chmod option. | |
3 | * | |
4 | * Copyright (C) 2002 Scott Howard | |
b3bf9b9d | 5 | * Copyright (C) 2005-2009 Wayne Davison |
0f78b815 WD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8e41b68e WD |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 3 of the License, or | |
10 | * (at your option) any later version. | |
0f78b815 WD |
11 | * |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
e7c67065 | 17 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 18 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 WD |
19 | */ |
20 | ||
0c983c1f | 21 | #include "rsync.h" |
aef2b8ce | 22 | #include "itypes.h" |
0c983c1f | 23 | |
a41d1106 | 24 | extern mode_t orig_umask; |
0c983c1f WD |
25 | |
26 | #define FLAG_X_KEEP (1<<0) | |
27 | #define FLAG_DIRS_ONLY (1<<1) | |
28 | #define FLAG_FILES_ONLY (1<<2) | |
29 | ||
30 | struct chmod_mode_struct { | |
31 | struct chmod_mode_struct *next; | |
32 | int ModeAND, ModeOR; | |
33 | char flags; | |
34 | }; | |
35 | ||
36 | #define CHMOD_ADD 1 | |
37 | #define CHMOD_SUB 2 | |
38 | #define CHMOD_EQ 3 | |
aef2b8ce | 39 | #define CHMOD_SET 4 |
0c983c1f WD |
40 | |
41 | #define STATE_ERROR 0 | |
42 | #define STATE_1ST_HALF 1 | |
43 | #define STATE_2ND_HALF 2 | |
aef2b8ce | 44 | #define STATE_OCTAL_NUM 3 |
0c983c1f WD |
45 | |
46 | /* Parse a chmod-style argument, and break it down into one or more AND/OR | |
15b03ab1 WD |
47 | * pairs in a linked list. We return a pointer to new items on succcess |
48 | * (appending the items to the specified list), or NULL on error. */ | |
49 | struct chmod_mode_struct *parse_chmod(const char *modestr, | |
50 | struct chmod_mode_struct **root_mode_ptr) | |
0c983c1f WD |
51 | { |
52 | int state = STATE_1ST_HALF; | |
53 | int where = 0, what = 0, op = 0, topbits = 0, topoct = 0, flags = 0; | |
54 | struct chmod_mode_struct *first_mode = NULL, *curr_mode = NULL, | |
cf9b4794 | 55 | *prev_mode = NULL; |
0c983c1f WD |
56 | |
57 | while (state != STATE_ERROR) { | |
58 | if (!*modestr || *modestr == ',') { | |
59 | int bits; | |
60 | ||
61 | if (!op) { | |
62 | state = STATE_ERROR; | |
63 | break; | |
64 | } | |
65 | prev_mode = curr_mode; | |
66 | curr_mode = new_array(struct chmod_mode_struct, 1); | |
67 | if (prev_mode) | |
68 | prev_mode->next = curr_mode; | |
69 | else | |
70 | first_mode = curr_mode; | |
71 | curr_mode->next = NULL; | |
72 | ||
73 | if (where) | |
74 | bits = where * what; | |
75 | else { | |
76 | where = 0111; | |
77 | bits = (where * what) & ~orig_umask; | |
78 | } | |
79 | ||
80 | switch (op) { | |
81 | case CHMOD_ADD: | |
a41d1106 | 82 | curr_mode->ModeAND = CHMOD_BITS; |
0c983c1f WD |
83 | curr_mode->ModeOR = bits + topoct; |
84 | break; | |
85 | case CHMOD_SUB: | |
a41d1106 | 86 | curr_mode->ModeAND = CHMOD_BITS - bits - topoct; |
0c983c1f WD |
87 | curr_mode->ModeOR = 0; |
88 | break; | |
89 | case CHMOD_EQ: | |
a41d1106 | 90 | curr_mode->ModeAND = CHMOD_BITS - (where * 7) - (topoct ? topbits : 0); |
0c983c1f WD |
91 | curr_mode->ModeOR = bits + topoct; |
92 | break; | |
aef2b8ce WD |
93 | case CHMOD_SET: |
94 | curr_mode->ModeAND = 0; | |
95 | curr_mode->ModeOR = bits; | |
96 | break; | |
0c983c1f WD |
97 | } |
98 | ||
99 | curr_mode->flags = flags; | |
100 | ||
101 | if (!*modestr) | |
102 | break; | |
103 | modestr++; | |
104 | ||
105 | state = STATE_1ST_HALF; | |
106 | where = what = op = topoct = topbits = flags = 0; | |
107 | } | |
108 | ||
aef2b8ce WD |
109 | switch (state) { |
110 | case STATE_1ST_HALF: | |
0c983c1f WD |
111 | switch (*modestr) { |
112 | case 'D': | |
113 | if (flags & FLAG_FILES_ONLY) | |
114 | state = STATE_ERROR; | |
eb8f5c74 | 115 | flags |= FLAG_DIRS_ONLY; |
0c983c1f WD |
116 | break; |
117 | case 'F': | |
118 | if (flags & FLAG_DIRS_ONLY) | |
119 | state = STATE_ERROR; | |
eb8f5c74 | 120 | flags |= FLAG_FILES_ONLY; |
0c983c1f WD |
121 | break; |
122 | case 'u': | |
123 | where |= 0100; | |
124 | topbits |= 04000; | |
125 | break; | |
126 | case 'g': | |
127 | where |= 0010; | |
128 | topbits |= 02000; | |
129 | break; | |
130 | case 'o': | |
131 | where |= 0001; | |
132 | break; | |
133 | case 'a': | |
134 | where |= 0111; | |
135 | break; | |
136 | case '+': | |
137 | op = CHMOD_ADD; | |
138 | state = STATE_2ND_HALF; | |
139 | break; | |
140 | case '-': | |
141 | op = CHMOD_SUB; | |
142 | state = STATE_2ND_HALF; | |
143 | break; | |
144 | case '=': | |
145 | op = CHMOD_EQ; | |
146 | state = STATE_2ND_HALF; | |
147 | break; | |
148 | default: | |
aef2b8ce WD |
149 | if (isDigit(modestr) && *modestr < '8' && !where) { |
150 | op = CHMOD_SET; | |
151 | state = STATE_OCTAL_NUM; | |
152 | where = 1; | |
153 | what = *modestr - '0'; | |
154 | } else | |
155 | state = STATE_ERROR; | |
0c983c1f WD |
156 | break; |
157 | } | |
aef2b8ce WD |
158 | break; |
159 | case STATE_2ND_HALF: | |
0c983c1f WD |
160 | switch (*modestr) { |
161 | case 'r': | |
162 | what |= 4; | |
163 | break; | |
164 | case 'w': | |
165 | what |= 2; | |
166 | break; | |
167 | case 'X': | |
eb8f5c74 | 168 | flags |= FLAG_X_KEEP; |
0c983c1f WD |
169 | /* FALL THROUGH */ |
170 | case 'x': | |
171 | what |= 1; | |
172 | break; | |
173 | case 's': | |
174 | if (topbits) | |
175 | topoct |= topbits; | |
176 | else | |
177 | topoct = 04000; | |
178 | break; | |
179 | case 't': | |
180 | topoct |= 01000; | |
181 | break; | |
182 | default: | |
183 | state = STATE_ERROR; | |
184 | break; | |
185 | } | |
aef2b8ce WD |
186 | break; |
187 | case STATE_OCTAL_NUM: | |
188 | if (isDigit(modestr) && *modestr < '8') { | |
189 | what = what*8 + *modestr - '0'; | |
190 | if (what > CHMOD_BITS) | |
191 | state = STATE_ERROR; | |
192 | } else | |
193 | state = STATE_ERROR; | |
194 | break; | |
0c983c1f WD |
195 | } |
196 | modestr++; | |
197 | } | |
198 | ||
199 | if (state == STATE_ERROR) { | |
200 | free_chmod_mode(first_mode); | |
15b03ab1 | 201 | return NULL; |
0c983c1f | 202 | } |
cf9b4794 | 203 | |
81b096fe WD |
204 | if (!(curr_mode = *root_mode_ptr)) |
205 | *root_mode_ptr = first_mode; | |
206 | else { | |
207 | while (curr_mode->next) | |
208 | curr_mode = curr_mode->next; | |
209 | curr_mode->next = first_mode; | |
cf9b4794 WD |
210 | } |
211 | ||
15b03ab1 | 212 | return first_mode; |
0c983c1f WD |
213 | } |
214 | ||
215 | ||
216 | /* Takes an existing file permission and a list of AND/OR changes, and | |
217 | * create a new permissions. */ | |
218 | int tweak_mode(int mode, struct chmod_mode_struct *chmod_modes) | |
219 | { | |
220 | int IsX = mode & 0111; | |
a41d1106 | 221 | int NonPerm = mode & ~CHMOD_BITS; |
0c983c1f WD |
222 | |
223 | for ( ; chmod_modes; chmod_modes = chmod_modes->next) { | |
224 | if ((chmod_modes->flags & FLAG_DIRS_ONLY) && !S_ISDIR(NonPerm)) | |
225 | continue; | |
226 | if ((chmod_modes->flags & FLAG_FILES_ONLY) && S_ISDIR(NonPerm)) | |
227 | continue; | |
228 | mode &= chmod_modes->ModeAND; | |
229 | if ((chmod_modes->flags & FLAG_X_KEEP) && !IsX && !S_ISDIR(NonPerm)) | |
230 | mode |= chmod_modes->ModeOR & ~0111; | |
231 | else | |
232 | mode |= chmod_modes->ModeOR; | |
233 | } | |
234 | ||
235 | return mode | NonPerm; | |
236 | } | |
237 | ||
238 | /* Free the linked list created by parse_chmod. */ | |
239 | int free_chmod_mode(struct chmod_mode_struct *chmod_modes) | |
240 | { | |
241 | struct chmod_mode_struct *next; | |
242 | ||
243 | while (chmod_modes) { | |
244 | next = chmod_modes->next; | |
245 | free(chmod_modes); | |
246 | chmod_modes = next; | |
247 | } | |
248 | return 0; | |
249 | } |