Commit | Line | Data |
---|---|---|
0f78b815 WD |
1 | /* |
2 | * Implement the core of the --chmod option. | |
3 | * | |
4 | * Copyright (C) 2002 Scott Howard | |
5 | * Copyright (C) 2005, 2006 Wayne Davison | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
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 WD |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
0f78b815 WD |
20 | */ |
21 | ||
0c983c1f WD |
22 | #include "rsync.h" |
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 | |
39 | ||
40 | #define STATE_ERROR 0 | |
41 | #define STATE_1ST_HALF 1 | |
42 | #define STATE_2ND_HALF 2 | |
43 | ||
44 | /* Parse a chmod-style argument, and break it down into one or more AND/OR | |
15b03ab1 WD |
45 | * pairs in a linked list. We return a pointer to new items on succcess |
46 | * (appending the items to the specified list), or NULL on error. */ | |
47 | struct chmod_mode_struct *parse_chmod(const char *modestr, | |
48 | struct chmod_mode_struct **root_mode_ptr) | |
0c983c1f WD |
49 | { |
50 | int state = STATE_1ST_HALF; | |
51 | int where = 0, what = 0, op = 0, topbits = 0, topoct = 0, flags = 0; | |
52 | struct chmod_mode_struct *first_mode = NULL, *curr_mode = NULL, | |
cf9b4794 | 53 | *prev_mode = NULL; |
0c983c1f WD |
54 | |
55 | while (state != STATE_ERROR) { | |
56 | if (!*modestr || *modestr == ',') { | |
57 | int bits; | |
58 | ||
59 | if (!op) { | |
60 | state = STATE_ERROR; | |
61 | break; | |
62 | } | |
63 | prev_mode = curr_mode; | |
64 | curr_mode = new_array(struct chmod_mode_struct, 1); | |
65 | if (prev_mode) | |
66 | prev_mode->next = curr_mode; | |
67 | else | |
68 | first_mode = curr_mode; | |
69 | curr_mode->next = NULL; | |
70 | ||
71 | if (where) | |
72 | bits = where * what; | |
73 | else { | |
74 | where = 0111; | |
75 | bits = (where * what) & ~orig_umask; | |
76 | } | |
77 | ||
78 | switch (op) { | |
79 | case CHMOD_ADD: | |
a41d1106 | 80 | curr_mode->ModeAND = CHMOD_BITS; |
0c983c1f WD |
81 | curr_mode->ModeOR = bits + topoct; |
82 | break; | |
83 | case CHMOD_SUB: | |
a41d1106 | 84 | curr_mode->ModeAND = CHMOD_BITS - bits - topoct; |
0c983c1f WD |
85 | curr_mode->ModeOR = 0; |
86 | break; | |
87 | case CHMOD_EQ: | |
a41d1106 | 88 | curr_mode->ModeAND = CHMOD_BITS - (where * 7) - (topoct ? topbits : 0); |
0c983c1f WD |
89 | curr_mode->ModeOR = bits + topoct; |
90 | break; | |
91 | } | |
92 | ||
93 | curr_mode->flags = flags; | |
94 | ||
95 | if (!*modestr) | |
96 | break; | |
97 | modestr++; | |
98 | ||
99 | state = STATE_1ST_HALF; | |
100 | where = what = op = topoct = topbits = flags = 0; | |
101 | } | |
102 | ||
103 | if (state != STATE_2ND_HALF) { | |
104 | switch (*modestr) { | |
105 | case 'D': | |
106 | if (flags & FLAG_FILES_ONLY) | |
107 | state = STATE_ERROR; | |
108 | flags |= FLAG_DIRS_ONLY; | |
109 | break; | |
110 | case 'F': | |
111 | if (flags & FLAG_DIRS_ONLY) | |
112 | state = STATE_ERROR; | |
113 | flags |= FLAG_FILES_ONLY; | |
114 | break; | |
115 | case 'u': | |
116 | where |= 0100; | |
117 | topbits |= 04000; | |
118 | break; | |
119 | case 'g': | |
120 | where |= 0010; | |
121 | topbits |= 02000; | |
122 | break; | |
123 | case 'o': | |
124 | where |= 0001; | |
125 | break; | |
126 | case 'a': | |
127 | where |= 0111; | |
128 | break; | |
129 | case '+': | |
130 | op = CHMOD_ADD; | |
131 | state = STATE_2ND_HALF; | |
132 | break; | |
133 | case '-': | |
134 | op = CHMOD_SUB; | |
135 | state = STATE_2ND_HALF; | |
136 | break; | |
137 | case '=': | |
138 | op = CHMOD_EQ; | |
139 | state = STATE_2ND_HALF; | |
140 | break; | |
141 | default: | |
142 | state = STATE_ERROR; | |
143 | break; | |
144 | } | |
145 | } else { | |
146 | switch (*modestr) { | |
147 | case 'r': | |
148 | what |= 4; | |
149 | break; | |
150 | case 'w': | |
151 | what |= 2; | |
152 | break; | |
153 | case 'X': | |
154 | flags |= FLAG_X_KEEP; | |
155 | /* FALL THROUGH */ | |
156 | case 'x': | |
157 | what |= 1; | |
158 | break; | |
159 | case 's': | |
160 | if (topbits) | |
161 | topoct |= topbits; | |
162 | else | |
163 | topoct = 04000; | |
164 | break; | |
165 | case 't': | |
166 | topoct |= 01000; | |
167 | break; | |
168 | default: | |
169 | state = STATE_ERROR; | |
170 | break; | |
171 | } | |
172 | } | |
173 | modestr++; | |
174 | } | |
175 | ||
176 | if (state == STATE_ERROR) { | |
177 | free_chmod_mode(first_mode); | |
15b03ab1 | 178 | return NULL; |
0c983c1f | 179 | } |
cf9b4794 | 180 | |
81b096fe WD |
181 | if (!(curr_mode = *root_mode_ptr)) |
182 | *root_mode_ptr = first_mode; | |
183 | else { | |
184 | while (curr_mode->next) | |
185 | curr_mode = curr_mode->next; | |
186 | curr_mode->next = first_mode; | |
cf9b4794 WD |
187 | } |
188 | ||
15b03ab1 | 189 | return first_mode; |
0c983c1f WD |
190 | } |
191 | ||
192 | ||
193 | /* Takes an existing file permission and a list of AND/OR changes, and | |
194 | * create a new permissions. */ | |
195 | int tweak_mode(int mode, struct chmod_mode_struct *chmod_modes) | |
196 | { | |
197 | int IsX = mode & 0111; | |
a41d1106 | 198 | int NonPerm = mode & ~CHMOD_BITS; |
0c983c1f WD |
199 | |
200 | for ( ; chmod_modes; chmod_modes = chmod_modes->next) { | |
201 | if ((chmod_modes->flags & FLAG_DIRS_ONLY) && !S_ISDIR(NonPerm)) | |
202 | continue; | |
203 | if ((chmod_modes->flags & FLAG_FILES_ONLY) && S_ISDIR(NonPerm)) | |
204 | continue; | |
205 | mode &= chmod_modes->ModeAND; | |
206 | if ((chmod_modes->flags & FLAG_X_KEEP) && !IsX && !S_ISDIR(NonPerm)) | |
207 | mode |= chmod_modes->ModeOR & ~0111; | |
208 | else | |
209 | mode |= chmod_modes->ModeOR; | |
210 | } | |
211 | ||
212 | return mode | NonPerm; | |
213 | } | |
214 | ||
215 | /* Free the linked list created by parse_chmod. */ | |
216 | int free_chmod_mode(struct chmod_mode_struct *chmod_modes) | |
217 | { | |
218 | struct chmod_mode_struct *next; | |
219 | ||
220 | while (chmod_modes) { | |
221 | next = chmod_modes->next; | |
222 | free(chmod_modes); | |
223 | chmod_modes = next; | |
224 | } | |
225 | return 0; | |
226 | } |