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- Made the itemize test check for CAN_HARDLINK_SYMLINK define instead
[rsync.git] / xattrs.c
bloba436572b808c16f6e1b1240cb8b2dc74194cd33c
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.
6 * Copyright (C) 2006-2008 Wayne Davison
7 *
8 * This program is free software; you can redistribute it and/or modify
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.
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
19 * with this program; if not, visit the http://fsf.org website.
20 */
21
22 #include "rsync.h"
23 #include "ifuncs.h"
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;
34 extern int preserve_xattrs;
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
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
57 #define MIGHT_NEED_RPRE (am_root < 0)
58 #define RSYNC_PREFIX USER_PREFIX "rsync."
59 #else
60 #define MIGHT_NEED_RPRE am_root
61 #define RSYNC_PREFIX "rsync."
62 #endif
63 #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
64
65 #define XSTAT_ATTR RSYNC_PREFIX "%stat"
66 #define XACC_ACL_ATTR RSYNC_PREFIX "%aacl"
67 #define XDEF_ACL_ATTR RSYNC_PREFIX "%dacl"
68
69 typedef struct {
70 char *datum, *name;
71 size_t datum_len, name_len;
72 int num;
73 } rsync_xa;
74
75 static size_t namebuf_len = 0;
76 static char *namebuf = NULL;
77
78 static item_list empty_xattr = EMPTY_ITEM_LIST;
79 static item_list rsync_xal_l = EMPTY_ITEM_LIST;
80
81 /* ------------------------------------------------------------------------- */
82
83 static void rsync_xal_free(item_list *xalp)
84 {
85 size_t i;
86 rsync_xa *rxas = xalp->items;
87
88 for (i = 0; i < xalp->count; i++) {
89 free(rxas[i].datum);
90 /*free(rxas[i].name);*/
91 }
92 xalp->count = 0;
93 }
94
95 void free_xattr(stat_x *sxp)
96 {
97 if (!sxp->xattr)
98 return;
99 rsync_xal_free(sxp->xattr);
100 free(sxp->xattr);
101 sxp->xattr = NULL;
102 }
103
104 static int rsync_xal_compare_names(const void *x1, const void *x2)
105 {
106 const rsync_xa *xa1 = x1;
107 const rsync_xa *xa2 = x2;
108 return strcmp(xa1->name, xa2->name);
109 }
110
111 static ssize_t get_xattr_names(const char *fname)
112 {
113 ssize_t list_len;
114 double arg;
115
116 if (!namebuf) {
117 namebuf_len = 1024;
118 namebuf = new_array(char, namebuf_len);
119 if (!namebuf)
120 out_of_memory("get_xattr_names");
121 }
122
123 while (1) {
124 /* The length returned includes all the '\0' terminators. */
125 list_len = sys_llistxattr(fname, namebuf, namebuf_len);
126 if (list_len >= 0) {
127 if ((size_t)list_len <= namebuf_len)
128 break;
129 } else if (errno == ENOTSUP)
130 return 0;
131 else if (errno != ERANGE) {
132 arg = (double)namebuf_len;
133 got_error:
134 rsyserr(FERROR_XFER, errno,
135 "get_xattr_names: llistxattr(\"%s\",%.0f) failed",
136 fname, arg);
137 return -1;
138 }
139 list_len = sys_llistxattr(fname, NULL, 0);
140 if (list_len < 0) {
141 arg = 0;
142 goto got_error;
143 }
144 if (namebuf_len)
145 free(namebuf);
146 namebuf_len = list_len + 1024;
147 namebuf = new_array(char, namebuf_len);
148 if (!namebuf)
149 out_of_memory("get_xattr_names");
150 }
151
152 return list_len;
153 }
154
155 /* On entry, the *len_ptr parameter contains the size of the extra space we
156 * should allocate when we create a buffer for the data. On exit, it contains
157 * the length of the datum. */
158 static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr,
159 int no_missing_error)
160 {
161 size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
162 size_t extra_len = *len_ptr;
163 char *ptr;
164
165 *len_ptr = datum_len;
166
167 if (datum_len == (size_t)-1) {
168 if (errno == ENOTSUP || no_missing_error)
169 return NULL;
170 rsyserr(FERROR_XFER, errno,
171 "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed",
172 fname, name);
173 return NULL;
174 }
175
176 if (!datum_len && !extra_len)
177 extra_len = 1; /* request non-zero amount of memory */
178 if (datum_len + extra_len < datum_len /* checks for overflow */
179 || !(ptr = new_array(char, datum_len + extra_len)))
180 out_of_memory("get_xattr_data");
181
182 if (datum_len) {
183 size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
184 if (len != datum_len) {
185 if (len == (size_t)-1) {
186 rsyserr(FERROR_XFER, errno,
187 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
188 " failed", fname, name, (long)datum_len);
189 } else {
190 rprintf(FERROR_XFER,
191 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
192 " returned %ld\n", fname, name,
193 (long)datum_len, (long)len);
194 }
195 free(ptr);
196 return NULL;
197 }
198 }
199
200 return ptr;
201 }
202
203 static int rsync_xal_get(const char *fname, item_list *xalp)
204 {
205 ssize_t list_len, name_len;
206 size_t datum_len, name_offset;
207 char *name, *ptr;
208 #ifdef HAVE_LINUX_XATTRS
209 int user_only = am_sender ? 0 : !am_root;
210 #endif
211 rsync_xa *rxa;
212 int count;
213
214 /* This puts the name list into the "namebuf" buffer. */
215 if ((list_len = get_xattr_names(fname)) < 0)
216 return -1;
217
218 for (name = namebuf; list_len > 0; name += name_len) {
219 name_len = strlen(name) + 1;
220 list_len -= name_len;
221
222 #ifdef HAVE_LINUX_XATTRS
223 /* We always ignore the system namespace, and non-root
224 * ignores everything but the user namespace. */
225 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
226 : HAS_PREFIX(name, SYSTEM_PREFIX))
227 continue;
228 #endif
229
230 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
231 if (name_len > RPRE_LEN && name[RPRE_LEN] == '%'
232 && HAS_PREFIX(name, RSYNC_PREFIX)) {
233 if ((am_sender && preserve_xattrs < 2)
234 || (am_root < 0 && strcmp(name, XSTAT_ATTR) == 0))
235 continue;
236 }
237
238 datum_len = name_len; /* Pass extra size to get_xattr_data() */
239 if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
240 return -1;
241
242 if (datum_len > MAX_FULL_DATUM) {
243 /* For large datums, we store a flag and a checksum. */
244 name_offset = 1 + MAX_DIGEST_LEN;
245 sum_init(checksum_seed);
246 sum_update(ptr, datum_len);
247 free(ptr);
248
249 if (!(ptr = new_array(char, name_offset + name_len)))
250 out_of_memory("rsync_xal_get");
251 *ptr = XSTATE_ABBREV;
252 sum_end(ptr + 1);
253 } else
254 name_offset = datum_len;
255
256 #ifdef HAVE_LINUX_XATTRS
257 if (am_root < 0 && name_len > RPRE_LEN && name[RPRE_LEN] != '%'
258 && HAS_PREFIX(name, RSYNC_PREFIX)) {
259 name += RPRE_LEN;
260 name_len -= RPRE_LEN;
261 }
262 #endif
263
264 rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
265 rxa->name = ptr + name_offset;
266 memcpy(rxa->name, name, name_len);
267 rxa->datum = ptr;
268 rxa->name_len = name_len;
269 rxa->datum_len = datum_len;
270 }
271 count = xalp->count;
272 rxa = xalp->items;
273 if (count > 1)
274 qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names);
275 for (rxa += count-1; count; count--, rxa--)
276 rxa->num = count;
277 return 0;
278 }
279
280 /* Read the xattr(s) for this filename. */
281 int get_xattr(const char *fname, stat_x *sxp)
282 {
283 sxp->xattr = new(item_list);
284 *sxp->xattr = empty_xattr;
285 if (rsync_xal_get(fname, sxp->xattr) < 0) {
286 free_xattr(sxp);
287 return -1;
288 }
289 return 0;
290 }
291
292 static int find_matching_xattr(item_list *xalp)
293 {
294 size_t i, j;
295 item_list *lst = rsync_xal_l.items;
296
297 for (i = 0; i < rsync_xal_l.count; i++) {
298 rsync_xa *rxas1 = lst[i].items;
299 rsync_xa *rxas2 = xalp->items;
300
301 /* Wrong number of elements? */
302 if (lst[i].count != xalp->count)
303 continue;
304 /* any elements different? */
305 for (j = 0; j < xalp->count; j++) {
306 if (rxas1[j].name_len != rxas2[j].name_len
307 || rxas1[j].datum_len != rxas2[j].datum_len
308 || strcmp(rxas1[j].name, rxas2[j].name))
309 break;
310 if (rxas1[j].datum_len > MAX_FULL_DATUM) {
311 if (memcmp(rxas1[j].datum + 1,
312 rxas2[j].datum + 1,
313 MAX_DIGEST_LEN) != 0)
314 break;
315 } else {
316 if (memcmp(rxas1[j].datum, rxas2[j].datum,
317 rxas2[j].datum_len))
318 break;
319 }
320 }
321 /* no differences found. This is The One! */
322 if (j == xalp->count)
323 return i;
324 }
325
326 return -1;
327 }
328
329 /* Store *xalp on the end of rsync_xal_l */
330 static void rsync_xal_store(item_list *xalp)
331 {
332 item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL);
333 /* Since the following call starts a new list, we know it will hold the
334 * entire initial-count, not just enough space for one new item. */
335 *new_lst = empty_xattr;
336 (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count);
337 memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa));
338 new_lst->count = xalp->count;
339 xalp->count = 0;
340 }
341
342 /* Send the make_xattr()-generated xattr list for this flist entry. */
343 int send_xattr(stat_x *sxp, int f)
344 {
345 int ndx = find_matching_xattr(sxp->xattr);
346
347 /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
348 write_varint(f, ndx + 1);
349
350 if (ndx < 0) {
351 rsync_xa *rxa;
352 int count = sxp->xattr->count;
353 write_varint(f, count);
354 for (rxa = sxp->xattr->items; count--; rxa++) {
355 #ifdef HAVE_LINUX_XATTRS
356 write_varint(f, rxa->name_len);
357 write_varint(f, rxa->datum_len);
358 write_buf(f, rxa->name, rxa->name_len);
359 #else
360 /* We strip the rsync prefix from disguised namespaces
361 * and put everything else in the user namespace. */
362 if (HAS_PREFIX(rxa->name, RSYNC_PREFIX)
363 && rxa->name[RPRE_LEN] != '%') {
364 write_varint(f, rxa->name_len - RPRE_LEN);
365 write_varint(f, rxa->datum_len);
366 write_buf(f, rxa->name + RPRE_LEN, rxa->name_len - RPRE_LEN);
367 } else {
368 write_varint(f, rxa->name_len + UPRE_LEN);
369 write_varint(f, rxa->datum_len);
370 write_buf(f, USER_PREFIX, UPRE_LEN);
371 write_buf(f, rxa->name, rxa->name_len);
372 }
373 #endif
374 if (rxa->datum_len > MAX_FULL_DATUM)
375 write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
376 else
377 write_buf(f, rxa->datum, rxa->datum_len);
378 }
379 ndx = rsync_xal_l.count; /* pre-incremented count */
380 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
381 }
382
383 return ndx;
384 }
385
386 /* Return a flag indicating if we need to change a file's xattrs. If
387 * "find_all" is specified, also mark any abbreviated xattrs that we
388 * need so that send_xattr_request() can tell the sender about them. */
389 int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
390 {
391 item_list *lst = rsync_xal_l.items;
392 rsync_xa *snd_rxa, *rec_rxa;
393 int snd_cnt, rec_cnt;
394 int cmp, same, xattrs_equal = 1;
395
396 if (sxp && XATTR_READY(*sxp)) {
397 rec_rxa = sxp->xattr->items;
398 rec_cnt = sxp->xattr->count;
399 } else {
400 rec_rxa = NULL;
401 rec_cnt = 0;
402 }
403
404 if (F_XATTR(file) >= 0)
405 lst += F_XATTR(file);
406 else
407 lst = &empty_xattr;
408
409 snd_rxa = lst->items;
410 snd_cnt = lst->count;
411
412 /* If the count of the sender's xattrs is different from our
413 * (receiver's) xattrs, the lists are not the same. */
414 if (snd_cnt != rec_cnt) {
415 if (!find_all)
416 return 1;
417 xattrs_equal = 0;
418 }
419
420 while (snd_cnt) {
421 cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
422 if (cmp > 0)
423 same = 0;
424 else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
425 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
426 && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
427 MAX_DIGEST_LEN) == 0;
428 /* Flag unrequested items that we need. */
429 if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
430 snd_rxa->datum[0] = XSTATE_TODO;
431 } else {
432 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
433 && memcmp(snd_rxa->datum, rec_rxa->datum,
434 snd_rxa->datum_len) == 0;
435 }
436 if (!same) {
437 if (!find_all)
438 return 1;
439 xattrs_equal = 0;
440 }
441
442 if (cmp <= 0) {
443 snd_rxa++;
444 snd_cnt--;
445 }
446 if (cmp >= 0) {
447 rec_rxa++;
448 rec_cnt--;
449 }
450 }
451
452 if (rec_cnt)
453 xattrs_equal = 0;
454
455 return !xattrs_equal;
456 }
457
458 /* When called by the generator with a NULL fname, this tells the sender
459 * which abbreviated xattr values we need. When called by the sender
460 * (with a non-NULL fname), we send all the extra xattr data it needs. */
461 void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
462 {
463 item_list *lst = rsync_xal_l.items;
464 int cnt, prior_req = 0;
465 rsync_xa *rxa;
466
467 lst += F_XATTR(file);
468 for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) {
469 if (rxa->datum_len <= MAX_FULL_DATUM)
470 continue;
471 switch (rxa->datum[0]) {
472 case XSTATE_ABBREV:
473 /* Items left abbreviated matched the sender's checksum, so
474 * the receiver will cache the local data for future use. */
475 if (am_generator)
476 rxa->datum[0] = XSTATE_DONE;
477 continue;
478 case XSTATE_TODO:
479 break;
480 default:
481 continue;
482 }
483
484 /* Flag that we handled this abbreviated item. */
485 rxa->datum[0] = XSTATE_DONE;
486
487 write_varint(f_out, rxa->num - prior_req);
488 prior_req = rxa->num;
489
490 if (fname) {
491 size_t len = 0;
492 char *ptr;
493
494 /* Re-read the long datum. */
495 if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) {
496 rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname);
497 write_varint(f_out, 0);
498 continue;
499 }
500
501 write_varint(f_out, len); /* length might have changed! */
502 write_buf(f_out, ptr, len);
503 free(ptr);
504 }
505 }
506
507 write_byte(f_out, 0); /* end the list */
508 }
509
510 /* When called by the sender, read the request from the generator and mark
511 * any needed xattrs with a flag that lets us know they need to be sent to
512 * the receiver. When called by the receiver, reads the sent data and
513 * stores it in place of its checksum. */
514 int recv_xattr_request(struct file_struct *file, int f_in)
515 {
516 item_list *lst = rsync_xal_l.items;
517 char *old_datum, *name;
518 rsync_xa *rxa;
519 int rel_pos, cnt, num, got_xattr_data = 0;
520
521 if (F_XATTR(file) < 0) {
522 rprintf(FERROR, "recv_xattr_request: internal data error!\n");
523 exit_cleanup(RERR_STREAMIO);
524 }
525 lst += F_XATTR(file);
526
527 cnt = lst->count;
528 rxa = lst->items;
529 num = 0;
530 while ((rel_pos = read_varint(f_in)) != 0) {
531 num += rel_pos;
532 while (cnt && rxa->num < num) {
533 rxa++;
534 cnt--;
535 }
536 if (!cnt || rxa->num != num) {
537 rprintf(FERROR, "[%s] could not find xattr #%d for %s\n",
538 who_am_i(), num, f_name(file, NULL));
539 exit_cleanup(RERR_STREAMIO);
540 }
541 if (rxa->datum_len <= MAX_FULL_DATUM || rxa->datum[0] != XSTATE_ABBREV) {
542 rprintf(FERROR, "[%s] internal abbrev error!\n", who_am_i());
543 exit_cleanup(RERR_STREAMIO);
544 }
545
546 if (am_sender) {
547 rxa->datum[0] = XSTATE_TODO;
548 continue;
549 }
550
551 old_datum = rxa->datum;
552 rxa->datum_len = read_varint(f_in);
553
554 if (rxa->name_len + rxa->datum_len < rxa->name_len)
555 out_of_memory("recv_xattr_request"); /* overflow */
556 rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
557 if (!rxa->datum)
558 out_of_memory("recv_xattr_request");
559 name = rxa->datum + rxa->datum_len;
560 memcpy(name, rxa->name, rxa->name_len);
561 rxa->name = name;
562 free(old_datum);
563 read_buf(f_in, rxa->datum, rxa->datum_len);
564 got_xattr_data = 1;
565 }
566
567 return got_xattr_data;
568 }
569
570 /* ------------------------------------------------------------------------- */
571
572 /* receive and build the rsync_xattr_lists */
573 void receive_xattr(struct file_struct *file, int f)
574 {
575 static item_list temp_xattr = EMPTY_ITEM_LIST;
576 int count, num;
577 int ndx = read_varint(f);
578
579 if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
580 rprintf(FERROR, "receive_xattr: xa index %d out of"
581 " range for %s\n", ndx, f_name(file, NULL));
582 exit_cleanup(RERR_STREAMIO);
583 }
584
585 if (ndx != 0) {
586 F_XATTR(file) = ndx - 1;
587 return;
588 }
589
590 if ((count = read_varint(f)) != 0) {
591 (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
592 temp_xattr.count = 0;
593 }
594
595 for (num = 1; num <= count; num++) {
596 char *ptr, *name;
597 rsync_xa *rxa;
598 size_t name_len = read_varint(f);
599 size_t datum_len = read_varint(f);
600 size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
601 size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
602 if (dget_len + extra_len < dget_len)
603 out_of_memory("receive_xattr"); /* overflow */
604 if (dget_len + extra_len + name_len < dget_len)
605 out_of_memory("receive_xattr"); /* overflow */
606 ptr = new_array(char, dget_len + extra_len + name_len);
607 if (!ptr)
608 out_of_memory("receive_xattr");
609 name = ptr + dget_len + extra_len;
610 read_buf(f, name, name_len);
611 if (dget_len == datum_len)
612 read_buf(f, ptr, dget_len);
613 else {
614 *ptr = XSTATE_ABBREV;
615 read_buf(f, ptr + 1, MAX_DIGEST_LEN);
616 }
617 #ifdef HAVE_LINUX_XATTRS
618 /* Non-root can only save the user namespace. */
619 if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
620 if (!am_root) {
621 free(ptr);
622 continue;
623 }
624 name -= RPRE_LEN;
625 name_len += RPRE_LEN;
626 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
627 }
628 #else
629 /* This OS only has a user namespace, so we either
630 * strip the user prefix, or we put a non-user
631 * namespace inside our rsync hierarchy. */
632 if (HAS_PREFIX(name, USER_PREFIX)) {
633 name += UPRE_LEN;
634 name_len -= UPRE_LEN;
635 } else if (am_root) {
636 name -= RPRE_LEN;
637 name_len += RPRE_LEN;
638 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
639 } else {
640 free(ptr);
641 continue;
642 }
643 #endif
644 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
645 if (preserve_xattrs < 2 && name_len > RPRE_LEN
646 && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
647 free(ptr);
648 continue;
649 }
650 rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
651 rxa->name = name;
652 rxa->datum = ptr;
653 rxa->name_len = name_len;
654 rxa->datum_len = datum_len;
655 rxa->num = num;
656 }
657
658 ndx = rsync_xal_l.count; /* pre-incremented count */
659 rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
660
661 F_XATTR(file) = ndx;
662 }
663
664 /* Turn the xattr data in stat_x into cached xattr data, setting the index
665 * values in the file struct. */
666 void cache_xattr(struct file_struct *file, stat_x *sxp)
667 {
668 int ndx;
669
670 if (!sxp->xattr)
671 return;
672
673 ndx = find_matching_xattr(sxp->xattr);
674 if (ndx < 0)
675 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
676
677 F_XATTR(file) = ndx;
678 }
679
680 static int rsync_xal_set(const char *fname, item_list *xalp,
681 const char *fnamecmp, stat_x *sxp)
682 {
683 rsync_xa *rxas = xalp->items;
684 ssize_t list_len;
685 size_t i, len;
686 char *name, *ptr, sum[MAX_DIGEST_LEN];
687 int name_len, ret = 0;
688
689 /* This puts the current name list into the "namebuf" buffer. */
690 if ((list_len = get_xattr_names(fname)) < 0)
691 return -1;
692
693 for (i = 0; i < xalp->count; i++) {
694 name = rxas[i].name;
695
696 if (XATTR_ABBREV(rxas[i])) {
697 /* See if the fnamecmp version is identical. */
698 len = name_len = rxas[i].name_len;
699 if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
700 still_abbrev:
701 if (am_generator)
702 continue;
703 rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
704 rxas[i].name, full_fname(fname));
705 ret = -1;
706 continue;
707 }
708 if (len != rxas[i].datum_len) {
709 free(ptr);
710 goto still_abbrev;
711 }
712
713 sum_init(checksum_seed);
714 sum_update(ptr, len);
715 sum_end(sum);
716 if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
717 free(ptr);
718 goto still_abbrev;
719 }
720
721 if (fname == fnamecmp)
722 ; /* Value is already set when identical */
723 else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
724 rsyserr(FERROR_XFER, errno,
725 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
726 fname, name);
727 ret = -1;
728 } else /* make sure caller sets mtime */
729 sxp->st.st_mtime = (time_t)-1;
730
731 if (am_generator) { /* generator items stay abbreviated */
732 free(ptr);
733 continue;
734 }
735
736 memcpy(ptr + len, name, name_len);
737 free(rxas[i].datum);
738
739 rxas[i].name = name = ptr + len;
740 rxas[i].datum = ptr;
741 continue;
742 }
743
744 if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
745 rsyserr(FERROR_XFER, errno,
746 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
747 fname, name);
748 ret = -1;
749 } else /* make sure caller sets mtime */
750 sxp->st.st_mtime = (time_t)-1;
751 }
752
753 /* Remove any extraneous names. */
754 for (name = namebuf; list_len > 0; name += name_len) {
755 name_len = strlen(name) + 1;
756 list_len -= name_len;
757
758 #ifdef HAVE_LINUX_XATTRS
759 /* We always ignore the system namespace, and non-root
760 * ignores everything but the user namespace. */
761 if (am_root ? HAS_PREFIX(name, SYSTEM_PREFIX)
762 : !HAS_PREFIX(name, USER_PREFIX))
763 continue;
764 #endif
765 if (am_root < 0 && name_len > RPRE_LEN
766 && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0)
767 continue;
768
769 for (i = 0; i < xalp->count; i++) {
770 if (strcmp(name, rxas[i].name) == 0)
771 break;
772 }
773 if (i == xalp->count) {
774 if (sys_lremovexattr(fname, name) < 0) {
775 rsyserr(FERROR_XFER, errno,
776 "rsync_xal_clear: lremovexattr(\"%s\",\"%s\") failed",
777 fname, name);
778 ret = -1;
779 } else /* make sure caller sets mtime */
780 sxp->st.st_mtime = (time_t)-1;
781 }
782 }
783
784 return ret;
785 }
786
787 /* Set extended attributes on indicated filename. */
788 int set_xattr(const char *fname, const struct file_struct *file,
789 const char *fnamecmp, stat_x *sxp)
790 {
791 int ndx;
792 item_list *lst = rsync_xal_l.items;
793
794 if (dry_run)
795 return 1; /* FIXME: --dry-run needs to compute this value */
796
797 if (read_only || list_only) {
798 errno = EROFS;
799 return -1;
800 }
801
802 ndx = F_XATTR(file);
803 return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp);
804 }
805
806 #ifdef SUPPORT_ACLS
807 char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
808 {
809 const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
810 *len_p = 0; /* no extra data alloc needed from get_xattr_data() */
811 return get_xattr_data(fname, name, len_p, 1);
812 }
813
814 int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
815 {
816 const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
817 if (sys_lsetxattr(fname, name, buf, buf_len) < 0) {
818 rsyserr(FERROR_XFER, errno,
819 "set_xattr_acl: lsetxattr(\"%s\",\"%s\") failed",
820 fname, name);
821 return -1;
822 }
823 return 0;
824 }
825
826 int del_def_xattr_acl(const char *fname)
827 {
828 return sys_lremovexattr(fname, XDEF_ACL_ATTR);
829 }
830 #endif
831
832 int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
833 {
834 int mode, rdev_major, rdev_minor, uid, gid, len;
835 char buf[256];
836
837 if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
838 return -1;
839
840 if (xst)
841 *xst = *fst;
842 else
843 xst = fst;
844 if (fname) {
845 fd = -1;
846 len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
847 } else {
848 fname = "fd";
849 len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
850 }
851 if (len >= (int)sizeof buf) {
852 len = -1;
853 errno = ERANGE;
854 }
855 if (len < 0) {
856 if (errno == ENOTSUP || errno == ENOATTR)
857 return -1;
858 if (errno == EPERM && S_ISLNK(fst->st_mode)) {
859 xst->st_uid = 0;
860 xst->st_gid = 0;
861 return 0;
862 }
863 rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
864 XSTAT_ATTR, full_fname(fname));
865 return -1;
866 }
867 buf[len] = '\0';
868
869 if (sscanf(buf, "%o %d,%d %d:%d",
870 &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
871 rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n",
872 XSTAT_ATTR, full_fname(fname), buf);
873 exit_cleanup(RERR_FILEIO);
874 }
875
876 xst->st_mode = from_wire_mode(mode);
877 xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
878 xst->st_uid = uid;
879 xst->st_gid = gid;
880
881 return 0;
882 }
883
884 int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
885 {
886 STRUCT_STAT fst, xst;
887 dev_t rdev;
888 mode_t mode, fmode;
889
890 if (dry_run)
891 return 0;
892
893 if (read_only || list_only) {
894 rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s",
895 XSTAT_ATTR, full_fname(fname));
896 return -1;
897 }
898
899 if (x_lstat(fname, &fst, &xst) < 0) {
900 rsyserr(FERROR_XFER, errno, "failed to re-stat %s",
901 full_fname(fname));
902 return -1;
903 }
904
905 fst.st_mode &= (_S_IFMT | CHMOD_BITS);
906 fmode = new_mode & (_S_IFMT | CHMOD_BITS);
907
908 if (IS_DEVICE(fmode) || IS_SPECIAL(fmode)) {
909 uint32 *devp = F_RDEV_P(file);
910 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
911 } else
912 rdev = 0;
913
914 /* Dump the special permissions and enable full owner access. */
915 mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS)
916 | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
917 if (fst.st_mode != mode)
918 do_chmod(fname, mode);
919 if (!IS_DEVICE(fst.st_mode) && !IS_SPECIAL(fst.st_mode))
920 fst.st_rdev = 0; /* just in case */
921
922 if (mode == fmode && fst.st_rdev == rdev
923 && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) {
924 /* xst.st_mode will be 0 if there's no current stat xattr */
925 if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) {
926 rsyserr(FERROR_XFER, errno,
927 "delete of stat xattr failed for %s",
928 full_fname(fname));
929 return -1;
930 }
931 return 0;
932 }
933
934 if (xst.st_mode != fmode || xst.st_rdev != rdev
935 || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
936 char buf[256];
937 int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u",
938 to_wire_mode(fmode),
939 (int)major(rdev), (int)minor(rdev),
940 F_OWNER(file), F_GROUP(file));
941 if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) {
942 if (errno == EPERM && S_ISLNK(fst.st_mode))
943 return 0;
944 rsyserr(FERROR_XFER, errno,
945 "failed to write xattr %s for %s",
946 XSTAT_ATTR, full_fname(fname));
947 return -1;
948 }
949 }
950
951 return 0;
952 }
953
954 int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
955 {
956 int ret = do_stat(fname, fst);
957 if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
958 xst->st_mode = 0;
959 return ret;
960 }
961
962 int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
963 {
964 int ret = do_lstat(fname, fst);
965 if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
966 xst->st_mode = 0;
967 return ret;
968 }
969
970 int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
971 {
972 int ret = do_fstat(fd, fst);
973 if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
974 xst->st_mode = 0;
975 return ret;
976 }
977
978 #endif /* SUPPORT_XATTRS */
rsync: a fast, versatile, remote (and local) file-copying tool