1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/*
* Implement the core of the --chmod option.
*
* Copyright (C) 2002 Scott Howard
* Copyright (C) 2005-2020 Wayne Davison
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, visit the http://fsf.org website.
*/
#include "rsync.h"
#include "itypes.h"
extern mode_t orig_umask;
#define FLAG_X_KEEP (1<<0)
#define FLAG_DIRS_ONLY (1<<1)
#define FLAG_FILES_ONLY (1<<2)
struct chmod_mode_struct {
struct chmod_mode_struct *next;
int ModeAND, ModeOR;
char flags;
};
#define CHMOD_ADD 1
#define CHMOD_SUB 2
#define CHMOD_EQ 3
#define CHMOD_SET 4
#define STATE_ERROR 0
#define STATE_1ST_HALF 1
#define STATE_2ND_HALF 2
#define STATE_OCTAL_NUM 3
/* Parse a chmod-style argument, and break it down into one or more AND/OR
* pairs in a linked list. We return a pointer to new items on success
* (appending the items to the specified list), or NULL on error. */
struct chmod_mode_struct *parse_chmod(const char *modestr,
struct chmod_mode_struct **root_mode_ptr)
{
int state = STATE_1ST_HALF;
int where = 0, what = 0, op = 0, topbits = 0, topoct = 0, flags = 0;
struct chmod_mode_struct *first_mode = NULL, *curr_mode = NULL,
*prev_mode = NULL;
while (state != STATE_ERROR) {
if (!*modestr || *modestr == ',') {
int bits;
if (!op) {
state = STATE_ERROR;
break;
}
prev_mode = curr_mode;
curr_mode = new_array(struct chmod_mode_struct, 1);
if (prev_mode)
prev_mode->next = curr_mode;
else
first_mode = curr_mode;
curr_mode->next = NULL;
if (where)
bits = where * what;
else {
where = 0111;
bits = (where * what) & ~orig_umask;
}
switch (op) {
case CHMOD_ADD:
curr_mode->ModeAND = CHMOD_BITS;
curr_mode->ModeOR = bits + topoct;
break;
case CHMOD_SUB:
curr_mode->ModeAND = CHMOD_BITS - bits - topoct;
curr_mode->ModeOR = 0;
break;
case CHMOD_EQ:
curr_mode->ModeAND = CHMOD_BITS - (where * 7) - (topoct ? topbits : 0);
curr_mode->ModeOR = bits + topoct;
break;
case CHMOD_SET:
curr_mode->ModeAND = 0;
curr_mode->ModeOR = bits;
break;
}
curr_mode->flags = flags;
if (!*modestr)
break;
modestr++;
state = STATE_1ST_HALF;
where = what = op = topoct = topbits = flags = 0;
}
switch (state) {
case STATE_1ST_HALF:
switch (*modestr) {
case 'D':
if (flags & FLAG_FILES_ONLY)
state = STATE_ERROR;
flags |= FLAG_DIRS_ONLY;
break;
case 'F':
if (flags & FLAG_DIRS_ONLY)
state = STATE_ERROR;
flags |= FLAG_FILES_ONLY;
break;
case 'u':
where |= 0100;
topbits |= 04000;
break;
case 'g':
where |= 0010;
topbits |= 02000;
break;
case 'o':
where |= 0001;
break;
case 'a':
where |= 0111;
break;
case '+':
op = CHMOD_ADD;
state = STATE_2ND_HALF;
break;
case '-':
op = CHMOD_SUB;
state = STATE_2ND_HALF;
break;
case '=':
op = CHMOD_EQ;
state = STATE_2ND_HALF;
break;
default:
if (isDigit(modestr) && *modestr < '8' && !where) {
op = CHMOD_SET;
state = STATE_OCTAL_NUM;
where = 1;
what = *modestr - '0';
} else
state = STATE_ERROR;
break;
}
break;
case STATE_2ND_HALF:
switch (*modestr) {
case 'r':
what |= 4;
break;
case 'w':
what |= 2;
break;
case 'X':
flags |= FLAG_X_KEEP;
/* FALL THROUGH */
case 'x':
what |= 1;
break;
case 's':
if (topbits)
topoct |= topbits;
else
topoct = 04000;
break;
case 't':
topoct |= 01000;
break;
default:
state = STATE_ERROR;
break;
}
break;
case STATE_OCTAL_NUM:
if (isDigit(modestr) && *modestr < '8') {
what = what*8 + *modestr - '0';
if (what > CHMOD_BITS)
state = STATE_ERROR;
} else
state = STATE_ERROR;
break;
}
modestr++;
}
if (state == STATE_ERROR) {
free_chmod_mode(first_mode);
return NULL;
}
if (!(curr_mode = *root_mode_ptr))
*root_mode_ptr = first_mode;
else {
while (curr_mode->next)
curr_mode = curr_mode->next;
curr_mode->next = first_mode;
}
return first_mode;
}
/* Takes an existing file permission and a list of AND/OR changes, and
* create a new permissions. */
int tweak_mode(int mode, struct chmod_mode_struct *chmod_modes)
{
int IsX = mode & 0111;
int NonPerm = mode & ~CHMOD_BITS;
for ( ; chmod_modes; chmod_modes = chmod_modes->next) {
if ((chmod_modes->flags & FLAG_DIRS_ONLY) && !S_ISDIR(NonPerm))
continue;
if ((chmod_modes->flags & FLAG_FILES_ONLY) && S_ISDIR(NonPerm))
continue;
mode &= chmod_modes->ModeAND;
if ((chmod_modes->flags & FLAG_X_KEEP) && !IsX && !S_ISDIR(NonPerm))
mode |= chmod_modes->ModeOR & ~0111;
else
mode |= chmod_modes->ModeOR;
}
return mode | NonPerm;
}
/* Free the linked list created by parse_chmod. */
int free_chmod_mode(struct chmod_mode_struct *chmod_modes)
{
struct chmod_mode_struct *next;
while (chmod_modes) {
next = chmod_modes->next;
free(chmod_modes);
chmod_modes = next;
}
return 0;
}
|
