Commit | Line | Data |
---|---|---|
16edf865 WD |
1 | /* |
2 | * Extended Attribute support for rsync. | |
3 | * Written by Jay Fenlason, vaguely based on the ACLs patch. | |
4 | * | |
5 | * Copyright (C) 2004 Red Hat, Inc. | |
d3d07a5e | 6 | * Copyright (C) 2006-2008 Wayne Davison |
16edf865 WD |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
8e41b68e WD |
9 | * it under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 3 of the License, or | |
11 | * (at your option) any later version. | |
16edf865 WD |
12 | * |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
4fd842f9 | 19 | * with this program; if not, visit the http://fsf.org website. |
16edf865 WD |
20 | */ |
21 | ||
22 | #include "rsync.h" | |
1b42f628 | 23 | #include "ifuncs.h" |
16edf865 WD |
24 | #include "lib/sysxattrs.h" |
25 | ||
26 | #ifdef SUPPORT_XATTRS | |
27 | ||
28 | extern int dry_run; | |
29 | extern int am_root; | |
30 | extern int am_sender; | |
31 | extern int am_generator; | |
32 | extern int read_only; | |
33 | extern int list_only; | |
524eaa82 | 34 | extern int preserve_xattrs; |
16edf865 WD |
35 | extern int checksum_seed; |
36 | ||
37 | #define RSYNC_XAL_INITIAL 5 | |
38 | #define RSYNC_XAL_LIST_INITIAL 100 | |
39 | ||
40 | #define MAX_FULL_DATUM 32 | |
41 | ||
42 | #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \ | |
43 | && strncmp(str, prfx, sizeof (prfx) - 1) == 0) | |
44 | ||
45 | #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len) | |
46 | ||
47 | #define XSTATE_ABBREV 0 | |
48 | #define XSTATE_DONE 1 | |
49 | #define XSTATE_TODO 2 | |
16edf865 WD |
50 | |
51 | #define USER_PREFIX "user." | |
52 | #define UPRE_LEN ((int)sizeof USER_PREFIX - 1) | |
53 | #define SYSTEM_PREFIX "system." | |
54 | #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1) | |
55 | ||
56 | #ifdef HAVE_LINUX_XATTRS | |
9439c0cb WD |
57 | #define MIGHT_NEED_RPRE (am_root < 0) |
58 | #define RSYNC_PREFIX USER_PREFIX "rsync." | |
16edf865 | 59 | #else |
9439c0cb | 60 | #define MIGHT_NEED_RPRE am_root |
16edf865 | 61 | #define RSYNC_PREFIX "rsync." |
16edf865 | 62 | #endif |
9439c0cb WD |
63 | #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1) |
64 | ||
d724dd18 WD |
65 | #define XSTAT_SUFFIX "stat" |
66 | #define XSTAT_ATTR RSYNC_PREFIX "%" XSTAT_SUFFIX | |
67 | #define XACC_ACL_SUFFIX "aacl" | |
68 | #define XACC_ACL_ATTR RSYNC_PREFIX "%" XACC_ACL_SUFFIX | |
69 | #define XDEF_ACL_SUFFIX "dacl" | |
70 | #define XDEF_ACL_ATTR RSYNC_PREFIX "%" XDEF_ACL_SUFFIX | |
16edf865 WD |
71 | |
72 | typedef struct { | |
73 | char *datum, *name; | |
74 | size_t datum_len, name_len; | |
68ddbaf6 | 75 | int num; |
16edf865 WD |
76 | } rsync_xa; |
77 | ||
78 | static size_t namebuf_len = 0; | |
79 | static char *namebuf = NULL; | |
80 | ||
81 | static item_list empty_xattr = EMPTY_ITEM_LIST; | |
82 | static item_list rsync_xal_l = EMPTY_ITEM_LIST; | |
83 | ||
84 | /* ------------------------------------------------------------------------- */ | |
85 | ||
86 | static void rsync_xal_free(item_list *xalp) | |
87 | { | |
88 | size_t i; | |
89 | rsync_xa *rxas = xalp->items; | |
90 | ||
91 | for (i = 0; i < xalp->count; i++) { | |
92 | free(rxas[i].datum); | |
93 | /*free(rxas[i].name);*/ | |
94 | } | |
95 | xalp->count = 0; | |
96 | } | |
97 | ||
13710874 | 98 | void free_xattr(stat_x *sxp) |
16edf865 WD |
99 | { |
100 | if (!sxp->xattr) | |
101 | return; | |
102 | rsync_xal_free(sxp->xattr); | |
103 | free(sxp->xattr); | |
104 | sxp->xattr = NULL; | |
105 | } | |
106 | ||
107 | static int rsync_xal_compare_names(const void *x1, const void *x2) | |
108 | { | |
109 | const rsync_xa *xa1 = x1; | |
110 | const rsync_xa *xa2 = x2; | |
111 | return strcmp(xa1->name, xa2->name); | |
112 | } | |
113 | ||
114 | static ssize_t get_xattr_names(const char *fname) | |
115 | { | |
116 | ssize_t list_len; | |
71daa07f | 117 | double arg; |
16edf865 WD |
118 | |
119 | if (!namebuf) { | |
120 | namebuf_len = 1024; | |
121 | namebuf = new_array(char, namebuf_len); | |
122 | if (!namebuf) | |
123 | out_of_memory("get_xattr_names"); | |
124 | } | |
125 | ||
71daa07f WD |
126 | while (1) { |
127 | /* The length returned includes all the '\0' terminators. */ | |
128 | list_len = sys_llistxattr(fname, namebuf, namebuf_len); | |
129 | if (list_len >= 0) { | |
130 | if ((size_t)list_len <= namebuf_len) | |
131 | break; | |
132 | } else if (errno == ENOTSUP) | |
133 | return 0; | |
134 | else if (errno != ERANGE) { | |
135 | arg = (double)namebuf_len; | |
136 | got_error: | |
3f0211b6 | 137 | rsyserr(FERROR_XFER, errno, |
71daa07f WD |
138 | "get_xattr_names: llistxattr(\"%s\",%.0f) failed", |
139 | fname, arg); | |
16edf865 WD |
140 | return -1; |
141 | } | |
71daa07f WD |
142 | list_len = sys_llistxattr(fname, NULL, 0); |
143 | if (list_len < 0) { | |
144 | arg = 0; | |
145 | goto got_error; | |
146 | } | |
16edf865 WD |
147 | if (namebuf_len) |
148 | free(namebuf); | |
149 | namebuf_len = list_len + 1024; | |
150 | namebuf = new_array(char, namebuf_len); | |
151 | if (!namebuf) | |
152 | out_of_memory("get_xattr_names"); | |
16edf865 WD |
153 | } |
154 | ||
71daa07f | 155 | return list_len; |
16edf865 WD |
156 | } |
157 | ||
158 | /* On entry, the *len_ptr parameter contains the size of the extra space we | |
159 | * should allocate when we create a buffer for the data. On exit, it contains | |
160 | * the length of the datum. */ | |
161 | static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr, | |
162 | int no_missing_error) | |
163 | { | |
164 | size_t datum_len = sys_lgetxattr(fname, name, NULL, 0); | |
41979f25 | 165 | size_t extra_len = *len_ptr; |
16edf865 WD |
166 | char *ptr; |
167 | ||
41979f25 WD |
168 | *len_ptr = datum_len; |
169 | ||
16edf865 WD |
170 | if (datum_len == (size_t)-1) { |
171 | if (errno == ENOTSUP || no_missing_error) | |
172 | return NULL; | |
3f0211b6 | 173 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
174 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed", |
175 | fname, name); | |
176 | return NULL; | |
177 | } | |
178 | ||
41979f25 WD |
179 | if (!datum_len && !extra_len) |
180 | extra_len = 1; /* request non-zero amount of memory */ | |
774d1c36 WD |
181 | if (datum_len + extra_len < datum_len) |
182 | overflow_exit("get_xattr_data"); | |
183 | if (!(ptr = new_array(char, datum_len + extra_len))) | |
16edf865 WD |
184 | out_of_memory("get_xattr_data"); |
185 | ||
16edf865 WD |
186 | if (datum_len) { |
187 | size_t len = sys_lgetxattr(fname, name, ptr, datum_len); | |
188 | if (len != datum_len) { | |
189 | if (len == (size_t)-1) { | |
3f0211b6 | 190 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
191 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)" |
192 | " failed", fname, name, (long)datum_len); | |
193 | } else { | |
3f0211b6 | 194 | rprintf(FERROR_XFER, |
16edf865 WD |
195 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)" |
196 | " returned %ld\n", fname, name, | |
197 | (long)datum_len, (long)len); | |
198 | } | |
199 | free(ptr); | |
200 | return NULL; | |
201 | } | |
202 | } | |
203 | ||
204 | return ptr; | |
205 | } | |
206 | ||
207 | static int rsync_xal_get(const char *fname, item_list *xalp) | |
208 | { | |
209 | ssize_t list_len, name_len; | |
210 | size_t datum_len, name_offset; | |
211 | char *name, *ptr; | |
212 | #ifdef HAVE_LINUX_XATTRS | |
213 | int user_only = am_sender ? 0 : !am_root; | |
214 | #endif | |
68ddbaf6 WD |
215 | rsync_xa *rxa; |
216 | int count; | |
16edf865 WD |
217 | |
218 | /* This puts the name list into the "namebuf" buffer. */ | |
219 | if ((list_len = get_xattr_names(fname)) < 0) | |
220 | return -1; | |
221 | ||
222 | for (name = namebuf; list_len > 0; name += name_len) { | |
16edf865 WD |
223 | name_len = strlen(name) + 1; |
224 | list_len -= name_len; | |
225 | ||
226 | #ifdef HAVE_LINUX_XATTRS | |
227 | /* We always ignore the system namespace, and non-root | |
228 | * ignores everything but the user namespace. */ | |
229 | if (user_only ? !HAS_PREFIX(name, USER_PREFIX) | |
230 | : HAS_PREFIX(name, SYSTEM_PREFIX)) | |
231 | continue; | |
232 | #endif | |
233 | ||
524eaa82 | 234 | /* No rsync.%FOO attributes are copied w/o 2 -X options. */ |
a685271d WD |
235 | if (name_len > RPRE_LEN && name[RPRE_LEN] == '%' |
236 | && HAS_PREFIX(name, RSYNC_PREFIX)) { | |
237 | if ((am_sender && preserve_xattrs < 2) | |
d724dd18 WD |
238 | || (am_root < 0 |
239 | && (strcmp(name+RPRE_LEN+1, XSTAT_SUFFIX) == 0 | |
240 | || strcmp(name+RPRE_LEN+1, XACC_ACL_SUFFIX) == 0 | |
241 | || strcmp(name+RPRE_LEN+1, XDEF_ACL_SUFFIX) == 0))) | |
a685271d WD |
242 | continue; |
243 | } | |
9439c0cb | 244 | |
16edf865 WD |
245 | datum_len = name_len; /* Pass extra size to get_xattr_data() */ |
246 | if (!(ptr = get_xattr_data(fname, name, &datum_len, 0))) | |
247 | return -1; | |
248 | ||
249 | if (datum_len > MAX_FULL_DATUM) { | |
250 | /* For large datums, we store a flag and a checksum. */ | |
251 | name_offset = 1 + MAX_DIGEST_LEN; | |
252 | sum_init(checksum_seed); | |
253 | sum_update(ptr, datum_len); | |
254 | free(ptr); | |
255 | ||
256 | if (!(ptr = new_array(char, name_offset + name_len))) | |
257 | out_of_memory("rsync_xal_get"); | |
258 | *ptr = XSTATE_ABBREV; | |
259 | sum_end(ptr + 1); | |
260 | } else | |
261 | name_offset = datum_len; | |
262 | ||
a685271d WD |
263 | rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL); |
264 | rxa->name = ptr + name_offset; | |
265 | memcpy(rxa->name, name, name_len); | |
266 | rxa->datum = ptr; | |
267 | rxa->name_len = name_len; | |
268 | rxa->datum_len = datum_len; | |
16edf865 | 269 | } |
68ddbaf6 WD |
270 | count = xalp->count; |
271 | rxa = xalp->items; | |
272 | if (count > 1) | |
273 | qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names); | |
274 | for (rxa += count-1; count; count--, rxa--) | |
275 | rxa->num = count; | |
16edf865 WD |
276 | return 0; |
277 | } | |
278 | ||
279 | /* Read the xattr(s) for this filename. */ | |
13710874 | 280 | int get_xattr(const char *fname, stat_x *sxp) |
16edf865 WD |
281 | { |
282 | sxp->xattr = new(item_list); | |
283 | *sxp->xattr = empty_xattr; | |
284 | if (rsync_xal_get(fname, sxp->xattr) < 0) { | |
285 | free_xattr(sxp); | |
286 | return -1; | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static int find_matching_xattr(item_list *xalp) | |
292 | { | |
293 | size_t i, j; | |
294 | item_list *lst = rsync_xal_l.items; | |
295 | ||
296 | for (i = 0; i < rsync_xal_l.count; i++) { | |
297 | rsync_xa *rxas1 = lst[i].items; | |
298 | rsync_xa *rxas2 = xalp->items; | |
299 | ||
300 | /* Wrong number of elements? */ | |
301 | if (lst[i].count != xalp->count) | |
302 | continue; | |
303 | /* any elements different? */ | |
304 | for (j = 0; j < xalp->count; j++) { | |
305 | if (rxas1[j].name_len != rxas2[j].name_len | |
306 | || rxas1[j].datum_len != rxas2[j].datum_len | |
307 | || strcmp(rxas1[j].name, rxas2[j].name)) | |
308 | break; | |
309 | if (rxas1[j].datum_len > MAX_FULL_DATUM) { | |
310 | if (memcmp(rxas1[j].datum + 1, | |
311 | rxas2[j].datum + 1, | |
312 | MAX_DIGEST_LEN) != 0) | |
313 | break; | |
314 | } else { | |
315 | if (memcmp(rxas1[j].datum, rxas2[j].datum, | |
316 | rxas2[j].datum_len)) | |
317 | break; | |
318 | } | |
319 | } | |
320 | /* no differences found. This is The One! */ | |
321 | if (j == xalp->count) | |
322 | return i; | |
323 | } | |
324 | ||
325 | return -1; | |
326 | } | |
327 | ||
328 | /* Store *xalp on the end of rsync_xal_l */ | |
329 | static void rsync_xal_store(item_list *xalp) | |
330 | { | |
331 | item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL); | |
332 | /* Since the following call starts a new list, we know it will hold the | |
333 | * entire initial-count, not just enough space for one new item. */ | |
334 | *new_lst = empty_xattr; | |
335 | (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count); | |
336 | memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa)); | |
337 | new_lst->count = xalp->count; | |
338 | xalp->count = 0; | |
339 | } | |
340 | ||
341 | /* Send the make_xattr()-generated xattr list for this flist entry. */ | |
13710874 | 342 | int send_xattr(stat_x *sxp, int f) |
16edf865 WD |
343 | { |
344 | int ndx = find_matching_xattr(sxp->xattr); | |
345 | ||
346 | /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */ | |
f31514ad | 347 | write_varint(f, ndx + 1); |
16edf865 WD |
348 | |
349 | if (ndx < 0) { | |
350 | rsync_xa *rxa; | |
351 | int count = sxp->xattr->count; | |
f31514ad | 352 | write_varint(f, count); |
16edf865 | 353 | for (rxa = sxp->xattr->items; count--; rxa++) { |
b4e6aac9 | 354 | size_t name_len = rxa->name_len; |
d724dd18 WD |
355 | const char *name = rxa->name; |
356 | /* Strip the rsync prefix from disguised namespaces. */ | |
b4e6aac9 | 357 | if (name_len > RPRE_LEN |
16edf865 | 358 | #ifdef HAVE_LINUX_XATTRS |
b4e6aac9 | 359 | && am_root < 0 |
d724dd18 | 360 | #endif |
b4e6aac9 | 361 | && name[RPRE_LEN] != '%' && HAS_PREFIX(name, RSYNC_PREFIX)) { |
d724dd18 WD |
362 | name += RPRE_LEN; |
363 | name_len -= RPRE_LEN; | |
364 | } | |
365 | #ifndef HAVE_LINUX_XATTRS | |
366 | else { | |
367 | /* Put everything else in the user namespace. */ | |
368 | name_len += UPRE_LEN; | |
369 | } | |
370 | #endif | |
371 | write_varint(f, name_len); | |
f31514ad | 372 | write_varint(f, rxa->datum_len); |
d724dd18 WD |
373 | #ifndef HAVE_LINUX_XATTRS |
374 | if (name_len > rxa->name_len) { | |
16edf865 | 375 | write_buf(f, USER_PREFIX, UPRE_LEN); |
d724dd18 | 376 | name_len -= UPRE_LEN; |
16edf865 WD |
377 | } |
378 | #endif | |
d724dd18 | 379 | write_buf(f, name, name_len); |
16edf865 WD |
380 | if (rxa->datum_len > MAX_FULL_DATUM) |
381 | write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN); | |
382 | else | |
383 | write_buf(f, rxa->datum, rxa->datum_len); | |
384 | } | |
385 | ndx = rsync_xal_l.count; /* pre-incremented count */ | |
386 | rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */ | |
387 | } | |
388 | ||
389 | return ndx; | |
390 | } | |
391 | ||
392 | /* Return a flag indicating if we need to change a file's xattrs. If | |
393 | * "find_all" is specified, also mark any abbreviated xattrs that we | |
394 | * need so that send_xattr_request() can tell the sender about them. */ | |
13710874 | 395 | int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all) |
16edf865 WD |
396 | { |
397 | item_list *lst = rsync_xal_l.items; | |
398 | rsync_xa *snd_rxa, *rec_rxa; | |
399 | int snd_cnt, rec_cnt; | |
400 | int cmp, same, xattrs_equal = 1; | |
401 | ||
402 | if (sxp && XATTR_READY(*sxp)) { | |
403 | rec_rxa = sxp->xattr->items; | |
404 | rec_cnt = sxp->xattr->count; | |
405 | } else { | |
406 | rec_rxa = NULL; | |
407 | rec_cnt = 0; | |
408 | } | |
409 | ||
410 | if (F_XATTR(file) >= 0) | |
411 | lst += F_XATTR(file); | |
412 | else | |
413 | lst = &empty_xattr; | |
414 | ||
415 | snd_rxa = lst->items; | |
416 | snd_cnt = lst->count; | |
417 | ||
418 | /* If the count of the sender's xattrs is different from our | |
419 | * (receiver's) xattrs, the lists are not the same. */ | |
420 | if (snd_cnt != rec_cnt) { | |
421 | if (!find_all) | |
422 | return 1; | |
423 | xattrs_equal = 0; | |
424 | } | |
425 | ||
426 | while (snd_cnt) { | |
427 | cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1; | |
428 | if (cmp > 0) | |
429 | same = 0; | |
430 | else if (snd_rxa->datum_len > MAX_FULL_DATUM) { | |
431 | same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len | |
432 | && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1, | |
433 | MAX_DIGEST_LEN) == 0; | |
434 | /* Flag unrequested items that we need. */ | |
435 | if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV) | |
436 | snd_rxa->datum[0] = XSTATE_TODO; | |
437 | } else { | |
438 | same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len | |
439 | && memcmp(snd_rxa->datum, rec_rxa->datum, | |
440 | snd_rxa->datum_len) == 0; | |
441 | } | |
442 | if (!same) { | |
443 | if (!find_all) | |
444 | return 1; | |
445 | xattrs_equal = 0; | |
446 | } | |
447 | ||
448 | if (cmp <= 0) { | |
449 | snd_rxa++; | |
450 | snd_cnt--; | |
451 | } | |
452 | if (cmp >= 0) { | |
453 | rec_rxa++; | |
454 | rec_cnt--; | |
455 | } | |
456 | } | |
457 | ||
458 | if (rec_cnt) | |
459 | xattrs_equal = 0; | |
460 | ||
461 | return !xattrs_equal; | |
462 | } | |
463 | ||
464 | /* When called by the generator with a NULL fname, this tells the sender | |
465 | * which abbreviated xattr values we need. When called by the sender | |
466 | * (with a non-NULL fname), we send all the extra xattr data it needs. */ | |
467 | void send_xattr_request(const char *fname, struct file_struct *file, int f_out) | |
468 | { | |
469 | item_list *lst = rsync_xal_l.items; | |
68ddbaf6 | 470 | int cnt, prior_req = 0; |
16edf865 WD |
471 | rsync_xa *rxa; |
472 | ||
473 | lst += F_XATTR(file); | |
68ddbaf6 | 474 | for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) { |
16edf865 WD |
475 | if (rxa->datum_len <= MAX_FULL_DATUM) |
476 | continue; | |
477 | switch (rxa->datum[0]) { | |
b769ad6a WD |
478 | case XSTATE_ABBREV: |
479 | /* Items left abbreviated matched the sender's checksum, so | |
480 | * the receiver will cache the local data for future use. */ | |
481 | if (am_generator) | |
482 | rxa->datum[0] = XSTATE_DONE; | |
16edf865 WD |
483 | continue; |
484 | case XSTATE_TODO: | |
485 | break; | |
486 | default: | |
487 | continue; | |
488 | } | |
489 | ||
490 | /* Flag that we handled this abbreviated item. */ | |
491 | rxa->datum[0] = XSTATE_DONE; | |
492 | ||
68ddbaf6 WD |
493 | write_varint(f_out, rxa->num - prior_req); |
494 | prior_req = rxa->num; | |
16edf865 WD |
495 | |
496 | if (fname) { | |
497 | size_t len = 0; | |
498 | char *ptr; | |
499 | ||
500 | /* Re-read the long datum. */ | |
a685271d WD |
501 | if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) { |
502 | rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname); | |
503 | write_varint(f_out, 0); | |
16edf865 | 504 | continue; |
a685271d | 505 | } |
16edf865 | 506 | |
f31514ad | 507 | write_varint(f_out, len); /* length might have changed! */ |
16edf865 WD |
508 | write_buf(f_out, ptr, len); |
509 | free(ptr); | |
510 | } | |
511 | } | |
512 | ||
513 | write_byte(f_out, 0); /* end the list */ | |
514 | } | |
515 | ||
16edf865 WD |
516 | /* When called by the sender, read the request from the generator and mark |
517 | * any needed xattrs with a flag that lets us know they need to be sent to | |
518 | * the receiver. When called by the receiver, reads the sent data and | |
519 | * stores it in place of its checksum. */ | |
e107b6b1 | 520 | int recv_xattr_request(struct file_struct *file, int f_in) |
16edf865 WD |
521 | { |
522 | item_list *lst = rsync_xal_l.items; | |
523 | char *old_datum, *name; | |
524 | rsync_xa *rxa; | |
68ddbaf6 | 525 | int rel_pos, cnt, num, got_xattr_data = 0; |
16edf865 WD |
526 | |
527 | if (F_XATTR(file) < 0) { | |
528 | rprintf(FERROR, "recv_xattr_request: internal data error!\n"); | |
529 | exit_cleanup(RERR_STREAMIO); | |
530 | } | |
531 | lst += F_XATTR(file); | |
532 | ||
533 | cnt = lst->count; | |
534 | rxa = lst->items; | |
68ddbaf6 | 535 | num = 0; |
f31514ad | 536 | while ((rel_pos = read_varint(f_in)) != 0) { |
68ddbaf6 WD |
537 | num += rel_pos; |
538 | while (cnt && rxa->num < num) { | |
539 | rxa++; | |
540 | cnt--; | |
541 | } | |
542 | if (!cnt || rxa->num != num) { | |
543 | rprintf(FERROR, "[%s] could not find xattr #%d for %s\n", | |
544 | who_am_i(), num, f_name(file, NULL)); | |
545 | exit_cleanup(RERR_STREAMIO); | |
546 | } | |
547 | if (rxa->datum_len <= MAX_FULL_DATUM || rxa->datum[0] != XSTATE_ABBREV) { | |
548 | rprintf(FERROR, "[%s] internal abbrev error!\n", who_am_i()); | |
16edf865 WD |
549 | exit_cleanup(RERR_STREAMIO); |
550 | } | |
551 | ||
552 | if (am_sender) { | |
553 | rxa->datum[0] = XSTATE_TODO; | |
554 | continue; | |
555 | } | |
556 | ||
557 | old_datum = rxa->datum; | |
f31514ad | 558 | rxa->datum_len = read_varint(f_in); |
16edf865 WD |
559 | |
560 | if (rxa->name_len + rxa->datum_len < rxa->name_len) | |
774d1c36 | 561 | overflow_exit("recv_xattr_request"); |
16edf865 WD |
562 | rxa->datum = new_array(char, rxa->datum_len + rxa->name_len); |
563 | if (!rxa->datum) | |
564 | out_of_memory("recv_xattr_request"); | |
565 | name = rxa->datum + rxa->datum_len; | |
566 | memcpy(name, rxa->name, rxa->name_len); | |
567 | rxa->name = name; | |
568 | free(old_datum); | |
569 | read_buf(f_in, rxa->datum, rxa->datum_len); | |
e107b6b1 | 570 | got_xattr_data = 1; |
16edf865 | 571 | } |
e107b6b1 WD |
572 | |
573 | return got_xattr_data; | |
16edf865 WD |
574 | } |
575 | ||
576 | /* ------------------------------------------------------------------------- */ | |
577 | ||
578 | /* receive and build the rsync_xattr_lists */ | |
579 | void receive_xattr(struct file_struct *file, int f) | |
580 | { | |
581 | static item_list temp_xattr = EMPTY_ITEM_LIST; | |
68ddbaf6 | 582 | int count, num; |
d724dd18 WD |
583 | #ifdef HAVE_LINUX_XATTRS |
584 | int need_sort = 0; | |
585 | #else | |
586 | int need_sort = 1; | |
587 | #endif | |
f31514ad | 588 | int ndx = read_varint(f); |
16edf865 WD |
589 | |
590 | if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) { | |
591 | rprintf(FERROR, "receive_xattr: xa index %d out of" | |
592 | " range for %s\n", ndx, f_name(file, NULL)); | |
593 | exit_cleanup(RERR_STREAMIO); | |
594 | } | |
595 | ||
596 | if (ndx != 0) { | |
597 | F_XATTR(file) = ndx - 1; | |
598 | return; | |
599 | } | |
600 | ||
f31514ad | 601 | if ((count = read_varint(f)) != 0) { |
16edf865 WD |
602 | (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count); |
603 | temp_xattr.count = 0; | |
604 | } | |
605 | ||
68ddbaf6 | 606 | for (num = 1; num <= count; num++) { |
16edf865 WD |
607 | char *ptr, *name; |
608 | rsync_xa *rxa; | |
f31514ad WD |
609 | size_t name_len = read_varint(f); |
610 | size_t datum_len = read_varint(f); | |
16edf865 | 611 | size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len; |
9439c0cb | 612 | size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0; |
774d1c36 WD |
613 | if ((dget_len + extra_len < dget_len) |
614 | || (dget_len + extra_len + name_len < dget_len)) | |
615 | overflow_exit("receive_xattr"); | |
16edf865 WD |
616 | ptr = new_array(char, dget_len + extra_len + name_len); |
617 | if (!ptr) | |
618 | out_of_memory("receive_xattr"); | |
619 | name = ptr + dget_len + extra_len; | |
620 | read_buf(f, name, name_len); | |
621 | if (dget_len == datum_len) | |
622 | read_buf(f, ptr, dget_len); | |
623 | else { | |
624 | *ptr = XSTATE_ABBREV; | |
625 | read_buf(f, ptr + 1, MAX_DIGEST_LEN); | |
626 | } | |
627 | #ifdef HAVE_LINUX_XATTRS | |
628 | /* Non-root can only save the user namespace. */ | |
68ddbaf6 WD |
629 | if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) { |
630 | if (!am_root) { | |
631 | free(ptr); | |
632 | continue; | |
633 | } | |
634 | name -= RPRE_LEN; | |
635 | name_len += RPRE_LEN; | |
636 | memcpy(name, RSYNC_PREFIX, RPRE_LEN); | |
d724dd18 | 637 | need_sort = 1; |
16edf865 WD |
638 | } |
639 | #else | |
640 | /* This OS only has a user namespace, so we either | |
641 | * strip the user prefix, or we put a non-user | |
642 | * namespace inside our rsync hierarchy. */ | |
643 | if (HAS_PREFIX(name, USER_PREFIX)) { | |
644 | name += UPRE_LEN; | |
645 | name_len -= UPRE_LEN; | |
646 | } else if (am_root) { | |
647 | name -= RPRE_LEN; | |
648 | name_len += RPRE_LEN; | |
649 | memcpy(name, RSYNC_PREFIX, RPRE_LEN); | |
650 | } else { | |
651 | free(ptr); | |
652 | continue; | |
653 | } | |
654 | #endif | |
524eaa82 WD |
655 | /* No rsync.%FOO attributes are copied w/o 2 -X options. */ |
656 | if (preserve_xattrs < 2 && name_len > RPRE_LEN | |
657 | && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) { | |
9439c0cb WD |
658 | free(ptr); |
659 | continue; | |
660 | } | |
16edf865 WD |
661 | rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1); |
662 | rxa->name = name; | |
663 | rxa->datum = ptr; | |
664 | rxa->name_len = name_len; | |
665 | rxa->datum_len = datum_len; | |
68ddbaf6 | 666 | rxa->num = num; |
16edf865 WD |
667 | } |
668 | ||
d724dd18 WD |
669 | if (need_sort && count > 1) |
670 | qsort(temp_xattr.items, count, sizeof (rsync_xa), rsync_xal_compare_names); | |
671 | ||
16edf865 WD |
672 | ndx = rsync_xal_l.count; /* pre-incremented count */ |
673 | rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */ | |
674 | ||
675 | F_XATTR(file) = ndx; | |
676 | } | |
677 | ||
13710874 | 678 | /* Turn the xattr data in stat_x into cached xattr data, setting the index |
16edf865 | 679 | * values in the file struct. */ |
13710874 | 680 | void cache_xattr(struct file_struct *file, stat_x *sxp) |
16edf865 WD |
681 | { |
682 | int ndx; | |
683 | ||
684 | if (!sxp->xattr) | |
685 | return; | |
686 | ||
687 | ndx = find_matching_xattr(sxp->xattr); | |
688 | if (ndx < 0) | |
689 | rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */ | |
690 | ||
691 | F_XATTR(file) = ndx; | |
692 | } | |
693 | ||
694 | static int rsync_xal_set(const char *fname, item_list *xalp, | |
13710874 | 695 | const char *fnamecmp, stat_x *sxp) |
16edf865 WD |
696 | { |
697 | rsync_xa *rxas = xalp->items; | |
698 | ssize_t list_len; | |
699 | size_t i, len; | |
700 | char *name, *ptr, sum[MAX_DIGEST_LEN]; | |
b4e6aac9 WD |
701 | size_t name_len; |
702 | int ret = 0; | |
16edf865 WD |
703 | |
704 | /* This puts the current name list into the "namebuf" buffer. */ | |
705 | if ((list_len = get_xattr_names(fname)) < 0) | |
706 | return -1; | |
707 | ||
708 | for (i = 0; i < xalp->count; i++) { | |
709 | name = rxas[i].name; | |
710 | ||
711 | if (XATTR_ABBREV(rxas[i])) { | |
712 | /* See if the fnamecmp version is identical. */ | |
713 | len = name_len = rxas[i].name_len; | |
714 | if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) { | |
715 | still_abbrev: | |
716 | if (am_generator) | |
717 | continue; | |
718 | rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n", | |
719 | rxas[i].name, full_fname(fname)); | |
720 | ret = -1; | |
721 | continue; | |
722 | } | |
723 | if (len != rxas[i].datum_len) { | |
724 | free(ptr); | |
725 | goto still_abbrev; | |
726 | } | |
727 | ||
728 | sum_init(checksum_seed); | |
729 | sum_update(ptr, len); | |
730 | sum_end(sum); | |
731 | if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) { | |
732 | free(ptr); | |
733 | goto still_abbrev; | |
734 | } | |
735 | ||
736 | if (fname == fnamecmp) | |
737 | ; /* Value is already set when identical */ | |
738 | else if (sys_lsetxattr(fname, name, ptr, len) < 0) { | |
3f0211b6 | 739 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
740 | "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed", |
741 | fname, name); | |
742 | ret = -1; | |
743 | } else /* make sure caller sets mtime */ | |
744 | sxp->st.st_mtime = (time_t)-1; | |
745 | ||
746 | if (am_generator) { /* generator items stay abbreviated */ | |
16edf865 WD |
747 | free(ptr); |
748 | continue; | |
749 | } | |
750 | ||
751 | memcpy(ptr + len, name, name_len); | |
752 | free(rxas[i].datum); | |
753 | ||
754 | rxas[i].name = name = ptr + len; | |
755 | rxas[i].datum = ptr; | |
756 | continue; | |
757 | } | |
758 | ||
759 | if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) { | |
3f0211b6 | 760 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
761 | "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed", |
762 | fname, name); | |
763 | ret = -1; | |
764 | } else /* make sure caller sets mtime */ | |
765 | sxp->st.st_mtime = (time_t)-1; | |
766 | } | |
767 | ||
768 | /* Remove any extraneous names. */ | |
769 | for (name = namebuf; list_len > 0; name += name_len) { | |
770 | name_len = strlen(name) + 1; | |
771 | list_len -= name_len; | |
772 | ||
773 | #ifdef HAVE_LINUX_XATTRS | |
774 | /* We always ignore the system namespace, and non-root | |
775 | * ignores everything but the user namespace. */ | |
776 | if (am_root ? HAS_PREFIX(name, SYSTEM_PREFIX) | |
777 | : !HAS_PREFIX(name, USER_PREFIX)) | |
778 | continue; | |
779 | #endif | |
e107b6b1 WD |
780 | if (am_root < 0 && name_len > RPRE_LEN |
781 | && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0) | |
782 | continue; | |
16edf865 WD |
783 | |
784 | for (i = 0; i < xalp->count; i++) { | |
785 | if (strcmp(name, rxas[i].name) == 0) | |
786 | break; | |
787 | } | |
788 | if (i == xalp->count) { | |
789 | if (sys_lremovexattr(fname, name) < 0) { | |
3f0211b6 | 790 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
791 | "rsync_xal_clear: lremovexattr(\"%s\",\"%s\") failed", |
792 | fname, name); | |
793 | ret = -1; | |
794 | } else /* make sure caller sets mtime */ | |
795 | sxp->st.st_mtime = (time_t)-1; | |
796 | } | |
797 | } | |
798 | ||
799 | return ret; | |
800 | } | |
801 | ||
802 | /* Set extended attributes on indicated filename. */ | |
803 | int set_xattr(const char *fname, const struct file_struct *file, | |
13710874 | 804 | const char *fnamecmp, stat_x *sxp) |
16edf865 WD |
805 | { |
806 | int ndx; | |
807 | item_list *lst = rsync_xal_l.items; | |
808 | ||
809 | if (dry_run) | |
810 | return 1; /* FIXME: --dry-run needs to compute this value */ | |
811 | ||
812 | if (read_only || list_only) { | |
813 | errno = EROFS; | |
814 | return -1; | |
815 | } | |
816 | ||
817 | ndx = F_XATTR(file); | |
818 | return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp); | |
819 | } | |
820 | ||
7ed6bc53 WD |
821 | #ifdef SUPPORT_ACLS |
822 | char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p) | |
823 | { | |
824 | const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR; | |
e516b69e | 825 | *len_p = 0; /* no extra data alloc needed from get_xattr_data() */ |
7ed6bc53 WD |
826 | return get_xattr_data(fname, name, len_p, 1); |
827 | } | |
828 | ||
829 | int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len) | |
830 | { | |
831 | const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR; | |
832 | if (sys_lsetxattr(fname, name, buf, buf_len) < 0) { | |
3f0211b6 | 833 | rsyserr(FERROR_XFER, errno, |
7ed6bc53 WD |
834 | "set_xattr_acl: lsetxattr(\"%s\",\"%s\") failed", |
835 | fname, name); | |
836 | return -1; | |
837 | } | |
838 | return 0; | |
839 | } | |
840 | ||
841 | int del_def_xattr_acl(const char *fname) | |
842 | { | |
843 | return sys_lremovexattr(fname, XDEF_ACL_ATTR); | |
844 | } | |
845 | #endif | |
846 | ||
9439c0cb WD |
847 | int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst) |
848 | { | |
849 | int mode, rdev_major, rdev_minor, uid, gid, len; | |
850 | char buf[256]; | |
851 | ||
852 | if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode)) | |
853 | return -1; | |
854 | ||
855 | if (xst) | |
856 | *xst = *fst; | |
857 | else | |
858 | xst = fst; | |
859 | if (fname) { | |
860 | fd = -1; | |
861 | len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1); | |
862 | } else { | |
863 | fname = "fd"; | |
864 | len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1); | |
865 | } | |
866 | if (len >= (int)sizeof buf) { | |
867 | len = -1; | |
868 | errno = ERANGE; | |
869 | } | |
870 | if (len < 0) { | |
871 | if (errno == ENOTSUP || errno == ENOATTR) | |
872 | return -1; | |
873 | if (errno == EPERM && S_ISLNK(fst->st_mode)) { | |
874 | xst->st_uid = 0; | |
875 | xst->st_gid = 0; | |
876 | return 0; | |
877 | } | |
3f0211b6 | 878 | rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s", |
9439c0cb WD |
879 | XSTAT_ATTR, full_fname(fname)); |
880 | return -1; | |
881 | } | |
882 | buf[len] = '\0'; | |
883 | ||
884 | if (sscanf(buf, "%o %d,%d %d:%d", | |
885 | &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) { | |
886 | rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n", | |
887 | XSTAT_ATTR, full_fname(fname), buf); | |
888 | exit_cleanup(RERR_FILEIO); | |
889 | } | |
890 | ||
891 | xst->st_mode = from_wire_mode(mode); | |
892 | xst->st_rdev = MAKEDEV(rdev_major, rdev_minor); | |
893 | xst->st_uid = uid; | |
894 | xst->st_gid = gid; | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
e107b6b1 | 899 | int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode) |
9439c0cb WD |
900 | { |
901 | STRUCT_STAT fst, xst; | |
902 | dev_t rdev; | |
903 | mode_t mode, fmode; | |
904 | ||
905 | if (dry_run) | |
906 | return 0; | |
907 | ||
908 | if (read_only || list_only) { | |
3f0211b6 | 909 | rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s", |
9439c0cb WD |
910 | XSTAT_ATTR, full_fname(fname)); |
911 | return -1; | |
912 | } | |
913 | ||
914 | if (x_lstat(fname, &fst, &xst) < 0) { | |
3f0211b6 | 915 | rsyserr(FERROR_XFER, errno, "failed to re-stat %s", |
9439c0cb WD |
916 | full_fname(fname)); |
917 | return -1; | |
918 | } | |
919 | ||
920 | fst.st_mode &= (_S_IFMT | CHMOD_BITS); | |
e107b6b1 | 921 | fmode = new_mode & (_S_IFMT | CHMOD_BITS); |
9439c0cb WD |
922 | |
923 | if (IS_DEVICE(fmode) || IS_SPECIAL(fmode)) { | |
924 | uint32 *devp = F_RDEV_P(file); | |
925 | rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)); | |
926 | } else | |
927 | rdev = 0; | |
928 | ||
929 | /* Dump the special permissions and enable full owner access. */ | |
930 | mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS) | |
931 | | (S_ISDIR(fst.st_mode) ? 0700 : 0600); | |
932 | if (fst.st_mode != mode) | |
933 | do_chmod(fname, mode); | |
934 | if (!IS_DEVICE(fst.st_mode) && !IS_SPECIAL(fst.st_mode)) | |
935 | fst.st_rdev = 0; /* just in case */ | |
936 | ||
937 | if (mode == fmode && fst.st_rdev == rdev | |
fb7b9ddc | 938 | && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) { |
9439c0cb WD |
939 | /* xst.st_mode will be 0 if there's no current stat xattr */ |
940 | if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) { | |
3f0211b6 | 941 | rsyserr(FERROR_XFER, errno, |
9439c0cb WD |
942 | "delete of stat xattr failed for %s", |
943 | full_fname(fname)); | |
944 | return -1; | |
945 | } | |
946 | return 0; | |
947 | } | |
948 | ||
949 | if (xst.st_mode != fmode || xst.st_rdev != rdev | |
fb7b9ddc | 950 | || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) { |
9439c0cb WD |
951 | char buf[256]; |
952 | int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u", | |
953 | to_wire_mode(fmode), | |
954 | (int)major(rdev), (int)minor(rdev), | |
fb7b9ddc | 955 | F_OWNER(file), F_GROUP(file)); |
9439c0cb WD |
956 | if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) { |
957 | if (errno == EPERM && S_ISLNK(fst.st_mode)) | |
958 | return 0; | |
3f0211b6 | 959 | rsyserr(FERROR_XFER, errno, |
9439c0cb WD |
960 | "failed to write xattr %s for %s", |
961 | XSTAT_ATTR, full_fname(fname)); | |
962 | return -1; | |
963 | } | |
964 | } | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
969 | int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
970 | { | |
971 | int ret = do_stat(fname, fst); | |
972 | if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst) | |
973 | xst->st_mode = 0; | |
974 | return ret; | |
975 | } | |
976 | ||
977 | int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
978 | { | |
979 | int ret = do_lstat(fname, fst); | |
980 | if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst) | |
981 | xst->st_mode = 0; | |
982 | return ret; | |
983 | } | |
984 | ||
985 | int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
986 | { | |
987 | int ret = do_fstat(fd, fst); | |
988 | if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst) | |
989 | xst->st_mode = 0; | |
990 | return ret; | |
991 | } | |
992 | ||
16edf865 | 993 | #endif /* SUPPORT_XATTRS */ |