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Avoid a crash if we read an index value without a valid first_flist.
[rsync.git] / xattrs.c
blobe65f652a745bd8c520fbac29e01aada12b673a25
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, 2007 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 #define XSTATE_LOCAL 3
51
52 #define USER_PREFIX "user."
53 #define UPRE_LEN ((int)sizeof USER_PREFIX - 1)
54 #define SYSTEM_PREFIX "system."
55 #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1)
56
57 #ifdef HAVE_LINUX_XATTRS
58 #define MIGHT_NEED_RPRE (am_root < 0)
59 #define RSYNC_PREFIX USER_PREFIX "rsync."
60 #else
61 #define MIGHT_NEED_RPRE am_root
62 #define RSYNC_PREFIX "rsync."
63 #endif
64 #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
65
66 #define XSTAT_ATTR RSYNC_PREFIX "%stat"
67 #define XACC_ACL_ATTR RSYNC_PREFIX "%aacl"
68 #define XDEF_ACL_ATTR RSYNC_PREFIX "%dacl"
69
70 typedef struct {
71 char *datum, *name;
72 size_t datum_len, name_len;
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
115 if (!namebuf) {
116 namebuf_len = 1024;
117 namebuf = new_array(char, namebuf_len);
118 if (!namebuf)
119 out_of_memory("get_xattr_names");
120 }
121
122 /* The length returned includes all the '\0' terminators. */
123 list_len = sys_llistxattr(fname, namebuf, namebuf_len);
124 if (list_len > (ssize_t)namebuf_len) {
125 list_len = -1;
126 errno = ERANGE;
127 }
128 if (list_len >= 0)
129 return list_len;
130 if (errno == ENOTSUP)
131 return 0;
132 if (errno == ERANGE) {
133 list_len = sys_llistxattr(fname, NULL, 0);
134 if (list_len < 0) {
135 rsyserr(FERROR, errno,
136 "get_xattr_names: llistxattr(\"%s\",0) failed",
137 fname);
138 return -1;
139 }
140 if (namebuf_len)
141 free(namebuf);
142 namebuf_len = list_len + 1024;
143 namebuf = new_array(char, namebuf_len);
144 if (!namebuf)
145 out_of_memory("get_xattr_names");
146 list_len = sys_llistxattr(fname, namebuf, namebuf_len);
147 if (list_len >= 0)
148 return list_len;
149 }
150
151 rsyserr(FERROR, errno,
152 "get_xattr_names: llistxattr(\"%s\",%ld) failed",
153 fname, (long)namebuf_len);
154 return -1;
155 }
156
157 /* On entry, the *len_ptr parameter contains the size of the extra space we
158 * should allocate when we create a buffer for the data. On exit, it contains
159 * the length of the datum. */
160 static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr,
161 int no_missing_error)
162 {
163 size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
164 char *ptr;
165
166 if (datum_len == (size_t)-1) {
167 if (errno == ENOTSUP || no_missing_error)
168 return NULL;
169 rsyserr(FERROR, errno,
170 "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed",
171 fname, name);
172 return NULL;
173 }
174
175 if (datum_len + *len_ptr < datum_len /* checks for overflow */
176 || !(ptr = new_array(char, datum_len + *len_ptr)))
177 out_of_memory("get_xattr_data");
178
179 *len_ptr = datum_len;
180
181 if (datum_len) {
182 size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
183 if (len != datum_len) {
184 if (len == (size_t)-1) {
185 rsyserr(FERROR, errno,
186 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
187 " failed", fname, name, (long)datum_len);
188 } else {
189 rprintf(FERROR,
190 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
191 " returned %ld\n", fname, name,
192 (long)datum_len, (long)len);
193 }
194 free(ptr);
195 return NULL;
196 }
197 }
198
199 return ptr;
200 }
201
202 static int rsync_xal_get(const char *fname, item_list *xalp)
203 {
204 ssize_t list_len, name_len;
205 size_t datum_len, name_offset;
206 char *name, *ptr;
207 #ifdef HAVE_LINUX_XATTRS
208 int user_only = am_sender ? 0 : !am_root;
209 #endif
210
211 /* This puts the name list into the "namebuf" buffer. */
212 if ((list_len = get_xattr_names(fname)) < 0)
213 return -1;
214
215 for (name = namebuf; list_len > 0; name += name_len) {
216 rsync_xa *rxas;
217
218 name_len = strlen(name) + 1;
219 list_len -= name_len;
220
221 #ifdef HAVE_LINUX_XATTRS
222 /* We always ignore the system namespace, and non-root
223 * ignores everything but the user namespace. */
224 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
225 : HAS_PREFIX(name, SYSTEM_PREFIX))
226 continue;
227 #endif
228
229 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
230 if (preserve_xattrs < 2 && name_len > RPRE_LEN
231 && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX))
232 continue;
233
234 datum_len = name_len; /* Pass extra size to get_xattr_data() */
235 if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
236 return -1;
237
238 if (datum_len > MAX_FULL_DATUM) {
239 /* For large datums, we store a flag and a checksum. */
240 name_offset = 1 + MAX_DIGEST_LEN;
241 sum_init(checksum_seed);
242 sum_update(ptr, datum_len);
243 free(ptr);
244
245 if (!(ptr = new_array(char, name_offset + name_len)))
246 out_of_memory("rsync_xal_get");
247 *ptr = XSTATE_ABBREV;
248 sum_end(ptr + 1);
249 } else
250 name_offset = datum_len;
251
252 #ifdef HAVE_LINUX_XATTRS
253 if (am_root < 0 && name_len > RPRE_LEN
254 && HAS_PREFIX(name, RSYNC_PREFIX)) {
255 name += RPRE_LEN;
256 name_len -= RPRE_LEN;
257 }
258 #endif
259
260 rxas = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
261 rxas->name = ptr + name_offset;
262 memcpy(rxas->name, name, name_len);
263 rxas->datum = ptr;
264 rxas->name_len = name_len;
265 rxas->datum_len = datum_len;
266 }
267 if (xalp->count > 1)
268 qsort(xalp->items, xalp->count, sizeof (rsync_xa), rsync_xal_compare_names);
269 return 0;
270 }
271
272 /* Read the xattr(s) for this filename. */
273 int get_xattr(const char *fname, stat_x *sxp)
274 {
275 sxp->xattr = new(item_list);
276 *sxp->xattr = empty_xattr;
277 if (rsync_xal_get(fname, sxp->xattr) < 0) {
278 free_xattr(sxp);
279 return -1;
280 }
281 return 0;
282 }
283
284 static int find_matching_xattr(item_list *xalp)
285 {
286 size_t i, j;
287 item_list *lst = rsync_xal_l.items;
288
289 for (i = 0; i < rsync_xal_l.count; i++) {
290 rsync_xa *rxas1 = lst[i].items;
291 rsync_xa *rxas2 = xalp->items;
292
293 /* Wrong number of elements? */
294 if (lst[i].count != xalp->count)
295 continue;
296 /* any elements different? */
297 for (j = 0; j < xalp->count; j++) {
298 if (rxas1[j].name_len != rxas2[j].name_len
299 || rxas1[j].datum_len != rxas2[j].datum_len
300 || strcmp(rxas1[j].name, rxas2[j].name))
301 break;
302 if (rxas1[j].datum_len > MAX_FULL_DATUM) {
303 if (memcmp(rxas1[j].datum + 1,
304 rxas2[j].datum + 1,
305 MAX_DIGEST_LEN) != 0)
306 break;
307 } else {
308 if (memcmp(rxas1[j].datum, rxas2[j].datum,
309 rxas2[j].datum_len))
310 break;
311 }
312 }
313 /* no differences found. This is The One! */
314 if (j == xalp->count)
315 return i;
316 }
317
318 return -1;
319 }
320
321 /* Store *xalp on the end of rsync_xal_l */
322 static void rsync_xal_store(item_list *xalp)
323 {
324 item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL);
325 /* Since the following call starts a new list, we know it will hold the
326 * entire initial-count, not just enough space for one new item. */
327 *new_lst = empty_xattr;
328 (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count);
329 memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa));
330 new_lst->count = xalp->count;
331 xalp->count = 0;
332 }
333
334 /* Send the make_xattr()-generated xattr list for this flist entry. */
335 int send_xattr(stat_x *sxp, int f)
336 {
337 int ndx = find_matching_xattr(sxp->xattr);
338
339 /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
340 write_varint(f, ndx + 1);
341
342 if (ndx < 0) {
343 rsync_xa *rxa;
344 int count = sxp->xattr->count;
345 write_varint(f, count);
346 for (rxa = sxp->xattr->items; count--; rxa++) {
347 #ifdef HAVE_LINUX_XATTRS
348 write_varint(f, rxa->name_len);
349 write_varint(f, rxa->datum_len);
350 write_buf(f, rxa->name, rxa->name_len);
351 #else
352 /* We strip the rsync prefix from disguised namespaces
353 * and put everything else in the user namespace. */
354 if (HAS_PREFIX(rxa->name, RSYNC_PREFIX)
355 && rxa->name[RPRE_LEN] != '%') {
356 write_varint(f, rxa->name_len - RPRE_LEN);
357 write_varint(f, rxa->datum_len);
358 write_buf(f, rxa->name + RPRE_LEN, rxa->name_len - RPRE_LEN);
359 } else {
360 write_varint(f, rxa->name_len + UPRE_LEN);
361 write_varint(f, rxa->datum_len);
362 write_buf(f, USER_PREFIX, UPRE_LEN);
363 write_buf(f, rxa->name, rxa->name_len);
364 }
365 #endif
366 if (rxa->datum_len > MAX_FULL_DATUM)
367 write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
368 else
369 write_buf(f, rxa->datum, rxa->datum_len);
370 }
371 ndx = rsync_xal_l.count; /* pre-incremented count */
372 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
373 }
374
375 return ndx;
376 }
377
378 /* Return a flag indicating if we need to change a file's xattrs. If
379 * "find_all" is specified, also mark any abbreviated xattrs that we
380 * need so that send_xattr_request() can tell the sender about them. */
381 int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
382 {
383 item_list *lst = rsync_xal_l.items;
384 rsync_xa *snd_rxa, *rec_rxa;
385 int snd_cnt, rec_cnt;
386 int cmp, same, xattrs_equal = 1;
387
388 if (sxp && XATTR_READY(*sxp)) {
389 rec_rxa = sxp->xattr->items;
390 rec_cnt = sxp->xattr->count;
391 } else {
392 rec_rxa = NULL;
393 rec_cnt = 0;
394 }
395
396 if (F_XATTR(file) >= 0)
397 lst += F_XATTR(file);
398 else
399 lst = &empty_xattr;
400
401 snd_rxa = lst->items;
402 snd_cnt = lst->count;
403
404 /* If the count of the sender's xattrs is different from our
405 * (receiver's) xattrs, the lists are not the same. */
406 if (snd_cnt != rec_cnt) {
407 if (!find_all)
408 return 1;
409 xattrs_equal = 0;
410 }
411
412 while (snd_cnt) {
413 cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
414 if (cmp > 0)
415 same = 0;
416 else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
417 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
418 && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
419 MAX_DIGEST_LEN) == 0;
420 /* Flag unrequested items that we need. */
421 if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
422 snd_rxa->datum[0] = XSTATE_TODO;
423 } else {
424 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
425 && memcmp(snd_rxa->datum, rec_rxa->datum,
426 snd_rxa->datum_len) == 0;
427 }
428 if (!same) {
429 if (!find_all)
430 return 1;
431 xattrs_equal = 0;
432 }
433
434 if (cmp <= 0) {
435 snd_rxa++;
436 snd_cnt--;
437 }
438 if (cmp >= 0) {
439 rec_rxa++;
440 rec_cnt--;
441 }
442 }
443
444 if (rec_cnt)
445 xattrs_equal = 0;
446
447 return !xattrs_equal;
448 }
449
450 /* When called by the generator with a NULL fname, this tells the sender
451 * which abbreviated xattr values we need. When called by the sender
452 * (with a non-NULL fname), we send all the extra xattr data it needs. */
453 void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
454 {
455 item_list *lst = rsync_xal_l.items;
456 int j, cnt, prior_req = -1;
457 rsync_xa *rxa;
458
459 lst += F_XATTR(file);
460 cnt = lst->count;
461 for (rxa = lst->items, j = 0; j < cnt; rxa++, j++) {
462 if (rxa->datum_len <= MAX_FULL_DATUM)
463 continue;
464 switch (rxa->datum[0]) {
465 case XSTATE_LOCAL:
466 /* Items set locally will get cached by receiver. */
467 rxa->datum[0] = XSTATE_DONE;
468 continue;
469 case XSTATE_TODO:
470 break;
471 default:
472 continue;
473 }
474
475 /* Flag that we handled this abbreviated item. */
476 rxa->datum[0] = XSTATE_DONE;
477
478 write_varint(f_out, j - prior_req);
479 prior_req = j;
480
481 if (fname) {
482 size_t len = 0;
483 char *ptr;
484
485 /* Re-read the long datum. */
486 if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0)))
487 continue;
488
489 write_varint(f_out, len); /* length might have changed! */
490 write_buf(f_out, ptr, len);
491 free(ptr);
492 }
493 }
494
495 write_byte(f_out, 0); /* end the list */
496 }
497
498 /* Any items set locally by the generator that the receiver doesn't
499 * get told about get changed back to XSTATE_ABBREV. */
500 void xattr_clear_locals(struct file_struct *file)
501 {
502 item_list *lst = rsync_xal_l.items;
503 rsync_xa *rxa;
504 int cnt;
505
506 if (F_XATTR(file) < 0)
507 return;
508
509 lst += F_XATTR(file);
510 cnt = lst->count;
511 for (rxa = lst->items; cnt--; rxa++) {
512 if (rxa->datum_len <= MAX_FULL_DATUM)
513 continue;
514 if (rxa->datum[0] == XSTATE_LOCAL)
515 rxa->datum[0] = XSTATE_ABBREV;
516 }
517 }
518
519 /* When called by the sender, read the request from the generator and mark
520 * any needed xattrs with a flag that lets us know they need to be sent to
521 * the receiver. When called by the receiver, reads the sent data and
522 * stores it in place of its checksum. */
523 void recv_xattr_request(struct file_struct *file, int f_in)
524 {
525 item_list *lst = rsync_xal_l.items;
526 char *old_datum, *name;
527 rsync_xa *rxa;
528 int rel_pos, cnt;
529
530 if (F_XATTR(file) < 0) {
531 rprintf(FERROR, "recv_xattr_request: internal data error!\n");
532 exit_cleanup(RERR_STREAMIO);
533 }
534 lst += F_XATTR(file);
535
536 cnt = lst->count;
537 rxa = lst->items;
538 rxa -= 1;
539 while ((rel_pos = read_varint(f_in)) != 0) {
540 rxa += rel_pos;
541 cnt -= rel_pos;
542 if (cnt < 0 || rxa->datum_len <= MAX_FULL_DATUM
543 || rxa->datum[0] != XSTATE_ABBREV) {
544 rprintf(FERROR, "recv_xattr_request: internal abbrev error!\n");
545 exit_cleanup(RERR_STREAMIO);
546 }
547
548 if (am_sender) {
549 rxa->datum[0] = XSTATE_TODO;
550 continue;
551 }
552
553 old_datum = rxa->datum;
554 rxa->datum_len = read_varint(f_in);
555
556 if (rxa->name_len + rxa->datum_len < rxa->name_len)
557 out_of_memory("recv_xattr_request"); /* overflow */
558 rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
559 if (!rxa->datum)
560 out_of_memory("recv_xattr_request");
561 name = rxa->datum + rxa->datum_len;
562 memcpy(name, rxa->name, rxa->name_len);
563 rxa->name = name;
564 free(old_datum);
565 read_buf(f_in, rxa->datum, rxa->datum_len);
566 }
567 }
568
569 /* ------------------------------------------------------------------------- */
570
571 /* receive and build the rsync_xattr_lists */
572 void receive_xattr(struct file_struct *file, int f)
573 {
574 static item_list temp_xattr = EMPTY_ITEM_LIST;
575 int count;
576 int ndx = read_varint(f);
577
578 if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
579 rprintf(FERROR, "receive_xattr: xa index %d out of"
580 " range for %s\n", ndx, f_name(file, NULL));
581 exit_cleanup(RERR_STREAMIO);
582 }
583
584 if (ndx != 0) {
585 F_XATTR(file) = ndx - 1;
586 return;
587 }
588
589 if ((count = read_varint(f)) != 0) {
590 (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
591 temp_xattr.count = 0;
592 }
593
594 while (count--) {
595 char *ptr, *name;
596 rsync_xa *rxa;
597 size_t name_len = read_varint(f);
598 size_t datum_len = read_varint(f);
599 size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
600 size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
601 if (dget_len + extra_len < dget_len)
602 out_of_memory("receive_xattr"); /* overflow */
603 if (dget_len + extra_len + name_len < dget_len)
604 out_of_memory("receive_xattr"); /* overflow */
605 ptr = new_array(char, dget_len + extra_len + name_len);
606 if (!ptr)
607 out_of_memory("receive_xattr");
608 name = ptr + dget_len + extra_len;
609 read_buf(f, name, name_len);
610 if (dget_len == datum_len)
611 read_buf(f, ptr, dget_len);
612 else {
613 *ptr = XSTATE_ABBREV;
614 read_buf(f, ptr + 1, MAX_DIGEST_LEN);
615 }
616 #ifdef HAVE_LINUX_XATTRS
617 /* Non-root can only save the user namespace. */
618 if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
619 if (!am_root) {
620 free(ptr);
621 continue;
622 }
623 name -= RPRE_LEN;
624 name_len += RPRE_LEN;
625 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
626 }
627 #else
628 /* This OS only has a user namespace, so we either
629 * strip the user prefix, or we put a non-user
630 * namespace inside our rsync hierarchy. */
631 if (HAS_PREFIX(name, USER_PREFIX)) {
632 name += UPRE_LEN;
633 name_len -= UPRE_LEN;
634 } else if (am_root) {
635 name -= RPRE_LEN;
636 name_len += RPRE_LEN;
637 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
638 } else {
639 free(ptr);
640 continue;
641 }
642 #endif
643 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
644 if (preserve_xattrs < 2 && name_len > RPRE_LEN
645 && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
646 free(ptr);
647 continue;
648 }
649 rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
650 rxa->name = name;
651 rxa->datum = ptr;
652 rxa->name_len = name_len;
653 rxa->datum_len = datum_len;
654 }
655
656 ndx = rsync_xal_l.count; /* pre-incremented count */
657 rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
658
659 F_XATTR(file) = ndx;
660 }
661
662 /* Turn the xattr data in stat_x into cached xattr data, setting the index
663 * values in the file struct. */
664 void cache_xattr(struct file_struct *file, stat_x *sxp)
665 {
666 int ndx;
667
668 if (!sxp->xattr)
669 return;
670
671 ndx = find_matching_xattr(sxp->xattr);
672 if (ndx < 0)
673 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
674
675 F_XATTR(file) = ndx;
676 }
677
678 static int rsync_xal_set(const char *fname, item_list *xalp,
679 const char *fnamecmp, stat_x *sxp)
680 {
681 rsync_xa *rxas = xalp->items;
682 ssize_t list_len;
683 size_t i, len;
684 char *name, *ptr, sum[MAX_DIGEST_LEN];
685 int name_len, ret = 0;
686
687 /* This puts the current name list into the "namebuf" buffer. */
688 if ((list_len = get_xattr_names(fname)) < 0)
689 return -1;
690
691 for (i = 0; i < xalp->count; i++) {
692 name = rxas[i].name;
693
694 if (XATTR_ABBREV(rxas[i])) {
695 /* See if the fnamecmp version is identical. */
696 len = name_len = rxas[i].name_len;
697 if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
698 still_abbrev:
699 if (am_generator)
700 continue;
701 rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
702 rxas[i].name, full_fname(fname));
703 ret = -1;
704 continue;
705 }
706 if (len != rxas[i].datum_len) {
707 free(ptr);
708 goto still_abbrev;
709 }
710
711 sum_init(checksum_seed);
712 sum_update(ptr, len);
713 sum_end(sum);
714 if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
715 free(ptr);
716 goto still_abbrev;
717 }
718
719 if (fname == fnamecmp)
720 ; /* Value is already set when identical */
721 else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
722 rsyserr(FERROR, errno,
723 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
724 fname, name);
725 ret = -1;
726 } else /* make sure caller sets mtime */
727 sxp->st.st_mtime = (time_t)-1;
728
729 if (am_generator) { /* generator items stay abbreviated */
730 if (rxas[i].datum[0] == XSTATE_ABBREV)
731 rxas[i].datum[0] = XSTATE_LOCAL;
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, 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
766 for (i = 0; i < xalp->count; i++) {
767 if (strcmp(name, rxas[i].name) == 0)
768 break;
769 }
770 if (i == xalp->count) {
771 if (sys_lremovexattr(fname, name) < 0) {
772 rsyserr(FERROR, errno,
773 "rsync_xal_clear: lremovexattr(\"%s\",\"%s\") failed",
774 fname, name);
775 ret = -1;
776 } else /* make sure caller sets mtime */
777 sxp->st.st_mtime = (time_t)-1;
778 }
779 }
780
781 return ret;
782 }
783
784 /* Set extended attributes on indicated filename. */
785 int set_xattr(const char *fname, const struct file_struct *file,
786 const char *fnamecmp, stat_x *sxp)
787 {
788 int ndx;
789 item_list *lst = rsync_xal_l.items;
790
791 if (dry_run)
792 return 1; /* FIXME: --dry-run needs to compute this value */
793
794 if (read_only || list_only) {
795 errno = EROFS;
796 return -1;
797 }
798
799 ndx = F_XATTR(file);
800 return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp);
801 }
802
803 #ifdef SUPPORT_ACLS
804 char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
805 {
806 const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
807 return get_xattr_data(fname, name, len_p, 1);
808 }
809
810 int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
811 {
812 const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
813 if (sys_lsetxattr(fname, name, buf, buf_len) < 0) {
814 rsyserr(FERROR, errno,
815 "set_xattr_acl: lsetxattr(\"%s\",\"%s\") failed",
816 fname, name);
817 return -1;
818 }
819 return 0;
820 }
821
822 int del_def_xattr_acl(const char *fname)
823 {
824 return sys_lremovexattr(fname, XDEF_ACL_ATTR);
825 }
826 #endif
827
828 int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
829 {
830 int mode, rdev_major, rdev_minor, uid, gid, len;
831 char buf[256];
832
833 if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
834 return -1;
835
836 if (xst)
837 *xst = *fst;
838 else
839 xst = fst;
840 if (fname) {
841 fd = -1;
842 len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
843 } else {
844 fname = "fd";
845 len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
846 }
847 if (len >= (int)sizeof buf) {
848 len = -1;
849 errno = ERANGE;
850 }
851 if (len < 0) {
852 if (errno == ENOTSUP || errno == ENOATTR)
853 return -1;
854 if (errno == EPERM && S_ISLNK(fst->st_mode)) {
855 xst->st_uid = 0;
856 xst->st_gid = 0;
857 return 0;
858 }
859 rsyserr(FERROR, errno, "failed to read xattr %s for %s",
860 XSTAT_ATTR, full_fname(fname));
861 return -1;
862 }
863 buf[len] = '\0';
864
865 if (sscanf(buf, "%o %d,%d %d:%d",
866 &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
867 rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n",
868 XSTAT_ATTR, full_fname(fname), buf);
869 exit_cleanup(RERR_FILEIO);
870 }
871
872 xst->st_mode = from_wire_mode(mode);
873 xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
874 xst->st_uid = uid;
875 xst->st_gid = gid;
876
877 return 0;
878 }
879
880 int set_stat_xattr(const char *fname, struct file_struct *file)
881 {
882 STRUCT_STAT fst, xst;
883 dev_t rdev;
884 mode_t mode, fmode;
885
886 if (dry_run)
887 return 0;
888
889 if (read_only || list_only) {
890 rsyserr(FERROR, EROFS, "failed to write xattr %s for %s",
891 XSTAT_ATTR, full_fname(fname));
892 return -1;
893 }
894
895 if (x_lstat(fname, &fst, &xst) < 0) {
896 rsyserr(FERROR, errno, "failed to re-stat %s",
897 full_fname(fname));
898 return -1;
899 }
900
901 fst.st_mode &= (_S_IFMT | CHMOD_BITS);
902 fmode = file->mode & (_S_IFMT | CHMOD_BITS);
903
904 if (IS_DEVICE(fmode) || IS_SPECIAL(fmode)) {
905 uint32 *devp = F_RDEV_P(file);
906 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
907 } else
908 rdev = 0;
909
910 /* Dump the special permissions and enable full owner access. */
911 mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS)
912 | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
913 if (fst.st_mode != mode)
914 do_chmod(fname, mode);
915 if (!IS_DEVICE(fst.st_mode) && !IS_SPECIAL(fst.st_mode))
916 fst.st_rdev = 0; /* just in case */
917
918 if (mode == fmode && fst.st_rdev == rdev
919 && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) {
920 /* xst.st_mode will be 0 if there's no current stat xattr */
921 if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) {
922 rsyserr(FERROR, errno,
923 "delete of stat xattr failed for %s",
924 full_fname(fname));
925 return -1;
926 }
927 return 0;
928 }
929
930 if (xst.st_mode != fmode || xst.st_rdev != rdev
931 || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
932 char buf[256];
933 int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u",
934 to_wire_mode(fmode),
935 (int)major(rdev), (int)minor(rdev),
936 F_OWNER(file), F_GROUP(file));
937 if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) {
938 if (errno == EPERM && S_ISLNK(fst.st_mode))
939 return 0;
940 rsyserr(FERROR, errno,
941 "failed to write xattr %s for %s",
942 XSTAT_ATTR, full_fname(fname));
943 return -1;
944 }
945 }
946
947 return 0;
948 }
949
950 int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
951 {
952 int ret = do_stat(fname, fst);
953 if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
954 xst->st_mode = 0;
955 return ret;
956 }
957
958 int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
959 {
960 int ret = do_lstat(fname, fst);
961 if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
962 xst->st_mode = 0;
963 return ret;
964 }
965
966 int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
967 {
968 int ret = do_fstat(fd, fst);
969 if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
970 xst->st_mode = 0;
971 return ret;
972 }
973
974 #endif /* SUPPORT_XATTRS */
rsync: a fast, versatile, remote (and local) file-copying tool