Commit | Line | Data |
---|---|---|
0f78b815 WD |
1 | /* |
2 | * Implement the core of the --chmod option. | |
3 | * | |
4 | * Copyright (C) 2002 Scott Howard | |
ba2133d6 | 5 | * Copyright (C) 2005-2007 Wayne Davison |
0f78b815 WD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
4fd842f9 | 8 | * it under the terms of the GNU General Public License version 3 as |
ba2133d6 | 9 | * published by the Free Software Foundation. |
0f78b815 WD |
10 | * |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
e7c67065 | 16 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 17 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 WD |
18 | */ |
19 | ||
0c983c1f WD |
20 | #include "rsync.h" |
21 | ||
a41d1106 | 22 | extern mode_t orig_umask; |
0c983c1f WD |
23 | |
24 | #define FLAG_X_KEEP (1<<0) | |
25 | #define FLAG_DIRS_ONLY (1<<1) | |
26 | #define FLAG_FILES_ONLY (1<<2) | |
27 | ||
28 | struct chmod_mode_struct { | |
29 | struct chmod_mode_struct *next; | |
30 | int ModeAND, ModeOR; | |
31 | char flags; | |
32 | }; | |
33 | ||
34 | #define CHMOD_ADD 1 | |
35 | #define CHMOD_SUB 2 | |
36 | #define CHMOD_EQ 3 | |
37 | ||
38 | #define STATE_ERROR 0 | |
39 | #define STATE_1ST_HALF 1 | |
40 | #define STATE_2ND_HALF 2 | |
41 | ||
42 | /* Parse a chmod-style argument, and break it down into one or more AND/OR | |
15b03ab1 WD |
43 | * pairs in a linked list. We return a pointer to new items on succcess |
44 | * (appending the items to the specified list), or NULL on error. */ | |
45 | struct chmod_mode_struct *parse_chmod(const char *modestr, | |
46 | struct chmod_mode_struct **root_mode_ptr) | |
0c983c1f WD |
47 | { |
48 | int state = STATE_1ST_HALF; | |
49 | int where = 0, what = 0, op = 0, topbits = 0, topoct = 0, flags = 0; | |
50 | struct chmod_mode_struct *first_mode = NULL, *curr_mode = NULL, | |
cf9b4794 | 51 | *prev_mode = NULL; |
0c983c1f WD |
52 | |
53 | while (state != STATE_ERROR) { | |
54 | if (!*modestr || *modestr == ',') { | |
55 | int bits; | |
56 | ||
57 | if (!op) { | |
58 | state = STATE_ERROR; | |
59 | break; | |
60 | } | |
61 | prev_mode = curr_mode; | |
62 | curr_mode = new_array(struct chmod_mode_struct, 1); | |
63 | if (prev_mode) | |
64 | prev_mode->next = curr_mode; | |
65 | else | |
66 | first_mode = curr_mode; | |
67 | curr_mode->next = NULL; | |
68 | ||
69 | if (where) | |
70 | bits = where * what; | |
71 | else { | |
72 | where = 0111; | |
73 | bits = (where * what) & ~orig_umask; | |
74 | } | |
75 | ||
76 | switch (op) { | |
77 | case CHMOD_ADD: | |
a41d1106 | 78 | curr_mode->ModeAND = CHMOD_BITS; |
0c983c1f WD |
79 | curr_mode->ModeOR = bits + topoct; |
80 | break; | |
81 | case CHMOD_SUB: | |
a41d1106 | 82 | curr_mode->ModeAND = CHMOD_BITS - bits - topoct; |
0c983c1f WD |
83 | curr_mode->ModeOR = 0; |
84 | break; | |
85 | case CHMOD_EQ: | |
a41d1106 | 86 | curr_mode->ModeAND = CHMOD_BITS - (where * 7) - (topoct ? topbits : 0); |
0c983c1f WD |
87 | curr_mode->ModeOR = bits + topoct; |
88 | break; | |
89 | } | |
90 | ||
91 | curr_mode->flags = flags; | |
92 | ||
93 | if (!*modestr) | |
94 | break; | |
95 | modestr++; | |
96 | ||
97 | state = STATE_1ST_HALF; | |
98 | where = what = op = topoct = topbits = flags = 0; | |
99 | } | |
100 | ||
101 | if (state != STATE_2ND_HALF) { | |
102 | switch (*modestr) { | |
103 | case 'D': | |
104 | if (flags & FLAG_FILES_ONLY) | |
105 | state = STATE_ERROR; | |
106 | flags |= FLAG_DIRS_ONLY; | |
107 | break; | |
108 | case 'F': | |
109 | if (flags & FLAG_DIRS_ONLY) | |
110 | state = STATE_ERROR; | |
111 | flags |= FLAG_FILES_ONLY; | |
112 | break; | |
113 | case 'u': | |
114 | where |= 0100; | |
115 | topbits |= 04000; | |
116 | break; | |
117 | case 'g': | |
118 | where |= 0010; | |
119 | topbits |= 02000; | |
120 | break; | |
121 | case 'o': | |
122 | where |= 0001; | |
123 | break; | |
124 | case 'a': | |
125 | where |= 0111; | |
126 | break; | |
127 | case '+': | |
128 | op = CHMOD_ADD; | |
129 | state = STATE_2ND_HALF; | |
130 | break; | |
131 | case '-': | |
132 | op = CHMOD_SUB; | |
133 | state = STATE_2ND_HALF; | |
134 | break; | |
135 | case '=': | |
136 | op = CHMOD_EQ; | |
137 | state = STATE_2ND_HALF; | |
138 | break; | |
139 | default: | |
140 | state = STATE_ERROR; | |
141 | break; | |
142 | } | |
143 | } else { | |
144 | switch (*modestr) { | |
145 | case 'r': | |
146 | what |= 4; | |
147 | break; | |
148 | case 'w': | |
149 | what |= 2; | |
150 | break; | |
151 | case 'X': | |
152 | flags |= FLAG_X_KEEP; | |
153 | /* FALL THROUGH */ | |
154 | case 'x': | |
155 | what |= 1; | |
156 | break; | |
157 | case 's': | |
158 | if (topbits) | |
159 | topoct |= topbits; | |
160 | else | |
161 | topoct = 04000; | |
162 | break; | |
163 | case 't': | |
164 | topoct |= 01000; | |
165 | break; | |
166 | default: | |
167 | state = STATE_ERROR; | |
168 | break; | |
169 | } | |
170 | } | |
171 | modestr++; | |
172 | } | |
173 | ||
174 | if (state == STATE_ERROR) { | |
175 | free_chmod_mode(first_mode); | |
15b03ab1 | 176 | return NULL; |
0c983c1f | 177 | } |
cf9b4794 | 178 | |
81b096fe WD |
179 | if (!(curr_mode = *root_mode_ptr)) |
180 | *root_mode_ptr = first_mode; | |
181 | else { | |
182 | while (curr_mode->next) | |
183 | curr_mode = curr_mode->next; | |
184 | curr_mode->next = first_mode; | |
cf9b4794 WD |
185 | } |
186 | ||
15b03ab1 | 187 | return first_mode; |
0c983c1f WD |
188 | } |
189 | ||
190 | ||
191 | /* Takes an existing file permission and a list of AND/OR changes, and | |
192 | * create a new permissions. */ | |
193 | int tweak_mode(int mode, struct chmod_mode_struct *chmod_modes) | |
194 | { | |
195 | int IsX = mode & 0111; | |
a41d1106 | 196 | int NonPerm = mode & ~CHMOD_BITS; |
0c983c1f WD |
197 | |
198 | for ( ; chmod_modes; chmod_modes = chmod_modes->next) { | |
199 | if ((chmod_modes->flags & FLAG_DIRS_ONLY) && !S_ISDIR(NonPerm)) | |
200 | continue; | |
201 | if ((chmod_modes->flags & FLAG_FILES_ONLY) && S_ISDIR(NonPerm)) | |
202 | continue; | |
203 | mode &= chmod_modes->ModeAND; | |
204 | if ((chmod_modes->flags & FLAG_X_KEEP) && !IsX && !S_ISDIR(NonPerm)) | |
205 | mode |= chmod_modes->ModeOR & ~0111; | |
206 | else | |
207 | mode |= chmod_modes->ModeOR; | |
208 | } | |
209 | ||
210 | return mode | NonPerm; | |
211 | } | |
212 | ||
213 | /* Free the linked list created by parse_chmod. */ | |
214 | int free_chmod_mode(struct chmod_mode_struct *chmod_modes) | |
215 | { | |
216 | struct chmod_mode_struct *next; | |
217 | ||
218 | while (chmod_modes) { | |
219 | next = chmod_modes->next; | |
220 | free(chmod_modes); | |
221 | chmod_modes = next; | |
222 | } | |
223 | return 0; | |
224 | } |