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New logging categories added to allow differentiation between
[rsync.git] / xattrs.c
blob21e30499ddbefe50c1ca32acdab29f672ae52037
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_XFER, 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_XFER, 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 size_t extra_len = *len_ptr;
165 char *ptr;
166
167 *len_ptr = datum_len;
168
169 if (datum_len == (size_t)-1) {
170 if (errno == ENOTSUP || no_missing_error)
171 return NULL;
172 rsyserr(FERROR_XFER, errno,
173 "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed",
174 fname, name);
175 return NULL;
176 }
177
178 if (!datum_len && !extra_len)
179 extra_len = 1; /* request non-zero amount of memory */
180 if (datum_len + extra_len < datum_len /* checks for overflow */
181 || !(ptr = new_array(char, datum_len + extra_len)))
182 out_of_memory("get_xattr_data");
183
184 if (datum_len) {
185 size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
186 if (len != datum_len) {
187 if (len == (size_t)-1) {
188 rsyserr(FERROR_XFER, errno,
189 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
190 " failed", fname, name, (long)datum_len);
191 } else {
192 rprintf(FERROR_XFER,
193 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
194 " returned %ld\n", fname, name,
195 (long)datum_len, (long)len);
196 }
197 free(ptr);
198 return NULL;
199 }
200 }
201
202 return ptr;
203 }
204
205 static int rsync_xal_get(const char *fname, item_list *xalp)
206 {
207 ssize_t list_len, name_len;
208 size_t datum_len, name_offset;
209 char *name, *ptr;
210 #ifdef HAVE_LINUX_XATTRS
211 int user_only = am_sender ? 0 : !am_root;
212 #endif
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 rsync_xa *rxas;
220
221 name_len = strlen(name) + 1;
222 list_len -= name_len;
223
224 #ifdef HAVE_LINUX_XATTRS
225 /* We always ignore the system namespace, and non-root
226 * ignores everything but the user namespace. */
227 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
228 : HAS_PREFIX(name, SYSTEM_PREFIX))
229 continue;
230 #endif
231
232 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
233 if (preserve_xattrs < 2 && name_len > RPRE_LEN
234 && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX))
235 continue;
236
237 datum_len = name_len; /* Pass extra size to get_xattr_data() */
238 if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
239 return -1;
240
241 if (datum_len > MAX_FULL_DATUM) {
242 /* For large datums, we store a flag and a checksum. */
243 name_offset = 1 + MAX_DIGEST_LEN;
244 sum_init(checksum_seed);
245 sum_update(ptr, datum_len);
246 free(ptr);
247
248 if (!(ptr = new_array(char, name_offset + name_len)))
249 out_of_memory("rsync_xal_get");
250 *ptr = XSTATE_ABBREV;
251 sum_end(ptr + 1);
252 } else
253 name_offset = datum_len;
254
255 #ifdef HAVE_LINUX_XATTRS
256 if (am_root < 0 && name_len > RPRE_LEN
257 && HAS_PREFIX(name, RSYNC_PREFIX)) {
258 name += RPRE_LEN;
259 name_len -= RPRE_LEN;
260 }
261 #endif
262
263 rxas = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
264 rxas->name = ptr + name_offset;
265 memcpy(rxas->name, name, name_len);
266 rxas->datum = ptr;
267 rxas->name_len = name_len;
268 rxas->datum_len = datum_len;
269 }
270 if (xalp->count > 1)
271 qsort(xalp->items, xalp->count, sizeof (rsync_xa), rsync_xal_compare_names);
272 return 0;
273 }
274
275 /* Read the xattr(s) for this filename. */
276 int get_xattr(const char *fname, stat_x *sxp)
277 {
278 sxp->xattr = new(item_list);
279 *sxp->xattr = empty_xattr;
280 if (rsync_xal_get(fname, sxp->xattr) < 0) {
281 free_xattr(sxp);
282 return -1;
283 }
284 return 0;
285 }
286
287 static int find_matching_xattr(item_list *xalp)
288 {
289 size_t i, j;
290 item_list *lst = rsync_xal_l.items;
291
292 for (i = 0; i < rsync_xal_l.count; i++) {
293 rsync_xa *rxas1 = lst[i].items;
294 rsync_xa *rxas2 = xalp->items;
295
296 /* Wrong number of elements? */
297 if (lst[i].count != xalp->count)
298 continue;
299 /* any elements different? */
300 for (j = 0; j < xalp->count; j++) {
301 if (rxas1[j].name_len != rxas2[j].name_len
302 || rxas1[j].datum_len != rxas2[j].datum_len
303 || strcmp(rxas1[j].name, rxas2[j].name))
304 break;
305 if (rxas1[j].datum_len > MAX_FULL_DATUM) {
306 if (memcmp(rxas1[j].datum + 1,
307 rxas2[j].datum + 1,
308 MAX_DIGEST_LEN) != 0)
309 break;
310 } else {
311 if (memcmp(rxas1[j].datum, rxas2[j].datum,
312 rxas2[j].datum_len))
313 break;
314 }
315 }
316 /* no differences found. This is The One! */
317 if (j == xalp->count)
318 return i;
319 }
320
321 return -1;
322 }
323
324 /* Store *xalp on the end of rsync_xal_l */
325 static void rsync_xal_store(item_list *xalp)
326 {
327 item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL);
328 /* Since the following call starts a new list, we know it will hold the
329 * entire initial-count, not just enough space for one new item. */
330 *new_lst = empty_xattr;
331 (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count);
332 memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa));
333 new_lst->count = xalp->count;
334 xalp->count = 0;
335 }
336
337 /* Send the make_xattr()-generated xattr list for this flist entry. */
338 int send_xattr(stat_x *sxp, int f)
339 {
340 int ndx = find_matching_xattr(sxp->xattr);
341
342 /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
343 write_varint(f, ndx + 1);
344
345 if (ndx < 0) {
346 rsync_xa *rxa;
347 int count = sxp->xattr->count;
348 write_varint(f, count);
349 for (rxa = sxp->xattr->items; count--; rxa++) {
350 #ifdef HAVE_LINUX_XATTRS
351 write_varint(f, rxa->name_len);
352 write_varint(f, rxa->datum_len);
353 write_buf(f, rxa->name, rxa->name_len);
354 #else
355 /* We strip the rsync prefix from disguised namespaces
356 * and put everything else in the user namespace. */
357 if (HAS_PREFIX(rxa->name, RSYNC_PREFIX)
358 && rxa->name[RPRE_LEN] != '%') {
359 write_varint(f, rxa->name_len - RPRE_LEN);
360 write_varint(f, rxa->datum_len);
361 write_buf(f, rxa->name + RPRE_LEN, rxa->name_len - RPRE_LEN);
362 } else {
363 write_varint(f, rxa->name_len + UPRE_LEN);
364 write_varint(f, rxa->datum_len);
365 write_buf(f, USER_PREFIX, UPRE_LEN);
366 write_buf(f, rxa->name, rxa->name_len);
367 }
368 #endif
369 if (rxa->datum_len > MAX_FULL_DATUM)
370 write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
371 else
372 write_buf(f, rxa->datum, rxa->datum_len);
373 }
374 ndx = rsync_xal_l.count; /* pre-incremented count */
375 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
376 }
377
378 return ndx;
379 }
380
381 /* Return a flag indicating if we need to change a file's xattrs. If
382 * "find_all" is specified, also mark any abbreviated xattrs that we
383 * need so that send_xattr_request() can tell the sender about them. */
384 int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
385 {
386 item_list *lst = rsync_xal_l.items;
387 rsync_xa *snd_rxa, *rec_rxa;
388 int snd_cnt, rec_cnt;
389 int cmp, same, xattrs_equal = 1;
390
391 if (sxp && XATTR_READY(*sxp)) {
392 rec_rxa = sxp->xattr->items;
393 rec_cnt = sxp->xattr->count;
394 } else {
395 rec_rxa = NULL;
396 rec_cnt = 0;
397 }
398
399 if (F_XATTR(file) >= 0)
400 lst += F_XATTR(file);
401 else
402 lst = &empty_xattr;
403
404 snd_rxa = lst->items;
405 snd_cnt = lst->count;
406
407 /* If the count of the sender's xattrs is different from our
408 * (receiver's) xattrs, the lists are not the same. */
409 if (snd_cnt != rec_cnt) {
410 if (!find_all)
411 return 1;
412 xattrs_equal = 0;
413 }
414
415 while (snd_cnt) {
416 cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
417 if (cmp > 0)
418 same = 0;
419 else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
420 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
421 && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
422 MAX_DIGEST_LEN) == 0;
423 /* Flag unrequested items that we need. */
424 if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
425 snd_rxa->datum[0] = XSTATE_TODO;
426 } else {
427 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
428 && memcmp(snd_rxa->datum, rec_rxa->datum,
429 snd_rxa->datum_len) == 0;
430 }
431 if (!same) {
432 if (!find_all)
433 return 1;
434 xattrs_equal = 0;
435 }
436
437 if (cmp <= 0) {
438 snd_rxa++;
439 snd_cnt--;
440 }
441 if (cmp >= 0) {
442 rec_rxa++;
443 rec_cnt--;
444 }
445 }
446
447 if (rec_cnt)
448 xattrs_equal = 0;
449
450 return !xattrs_equal;
451 }
452
453 /* When called by the generator with a NULL fname, this tells the sender
454 * which abbreviated xattr values we need. When called by the sender
455 * (with a non-NULL fname), we send all the extra xattr data it needs. */
456 void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
457 {
458 item_list *lst = rsync_xal_l.items;
459 int j, cnt, prior_req = -1;
460 rsync_xa *rxa;
461
462 lst += F_XATTR(file);
463 cnt = lst->count;
464 for (rxa = lst->items, j = 0; j < cnt; rxa++, j++) {
465 if (rxa->datum_len <= MAX_FULL_DATUM)
466 continue;
467 switch (rxa->datum[0]) {
468 case XSTATE_LOCAL:
469 /* Items set locally will get cached by receiver. */
470 rxa->datum[0] = XSTATE_DONE;
471 continue;
472 case XSTATE_TODO:
473 break;
474 default:
475 continue;
476 }
477
478 /* Flag that we handled this abbreviated item. */
479 rxa->datum[0] = XSTATE_DONE;
480
481 write_varint(f_out, j - prior_req);
482 prior_req = j;
483
484 if (fname) {
485 size_t len = 0;
486 char *ptr;
487
488 /* Re-read the long datum. */
489 if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0)))
490 continue;
491
492 write_varint(f_out, len); /* length might have changed! */
493 write_buf(f_out, ptr, len);
494 free(ptr);
495 }
496 }
497
498 write_byte(f_out, 0); /* end the list */
499 }
500
501 /* Any items set locally by the generator that the receiver doesn't
502 * get told about get changed back to XSTATE_ABBREV. */
503 void xattr_clear_locals(struct file_struct *file)
504 {
505 item_list *lst = rsync_xal_l.items;
506 rsync_xa *rxa;
507 int cnt;
508
509 if (F_XATTR(file) < 0)
510 return;
511
512 lst += F_XATTR(file);
513 cnt = lst->count;
514 for (rxa = lst->items; cnt--; rxa++) {
515 if (rxa->datum_len <= MAX_FULL_DATUM)
516 continue;
517 if (rxa->datum[0] == XSTATE_LOCAL)
518 rxa->datum[0] = XSTATE_ABBREV;
519 }
520 }
521
522 /* When called by the sender, read the request from the generator and mark
523 * any needed xattrs with a flag that lets us know they need to be sent to
524 * the receiver. When called by the receiver, reads the sent data and
525 * stores it in place of its checksum. */
526 void recv_xattr_request(struct file_struct *file, int f_in)
527 {
528 item_list *lst = rsync_xal_l.items;
529 char *old_datum, *name;
530 rsync_xa *rxa;
531 int rel_pos, cnt;
532
533 if (F_XATTR(file) < 0) {
534 rprintf(FERROR, "recv_xattr_request: internal data error!\n");
535 exit_cleanup(RERR_STREAMIO);
536 }
537 lst += F_XATTR(file);
538
539 cnt = lst->count;
540 rxa = lst->items;
541 rxa -= 1;
542 while ((rel_pos = read_varint(f_in)) != 0) {
543 rxa += rel_pos;
544 cnt -= rel_pos;
545 if (cnt < 0 || rxa->datum_len <= MAX_FULL_DATUM
546 || rxa->datum[0] != XSTATE_ABBREV) {
547 rprintf(FERROR, "recv_xattr_request: internal abbrev error!\n");
548 exit_cleanup(RERR_STREAMIO);
549 }
550
551 if (am_sender) {
552 rxa->datum[0] = XSTATE_TODO;
553 continue;
554 }
555
556 old_datum = rxa->datum;
557 rxa->datum_len = read_varint(f_in);
558
559 if (rxa->name_len + rxa->datum_len < rxa->name_len)
560 out_of_memory("recv_xattr_request"); /* overflow */
561 rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
562 if (!rxa->datum)
563 out_of_memory("recv_xattr_request");
564 name = rxa->datum + rxa->datum_len;
565 memcpy(name, rxa->name, rxa->name_len);
566 rxa->name = name;
567 free(old_datum);
568 read_buf(f_in, rxa->datum, rxa->datum_len);
569 }
570 }
571
572 /* ------------------------------------------------------------------------- */
573
574 /* receive and build the rsync_xattr_lists */
575 void receive_xattr(struct file_struct *file, int f)
576 {
577 static item_list temp_xattr = EMPTY_ITEM_LIST;
578 int count;
579 int ndx = read_varint(f);
580
581 if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
582 rprintf(FERROR, "receive_xattr: xa index %d out of"
583 " range for %s\n", ndx, f_name(file, NULL));
584 exit_cleanup(RERR_STREAMIO);
585 }
586
587 if (ndx != 0) {
588 F_XATTR(file) = ndx - 1;
589 return;
590 }
591
592 if ((count = read_varint(f)) != 0) {
593 (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
594 temp_xattr.count = 0;
595 }
596
597 while (count--) {
598 char *ptr, *name;
599 rsync_xa *rxa;
600 size_t name_len = read_varint(f);
601 size_t datum_len = read_varint(f);
602 size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
603 size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
604 if (dget_len + extra_len < dget_len)
605 out_of_memory("receive_xattr"); /* overflow */
606 if (dget_len + extra_len + name_len < dget_len)
607 out_of_memory("receive_xattr"); /* overflow */
608 ptr = new_array(char, dget_len + extra_len + name_len);
609 if (!ptr)
610 out_of_memory("receive_xattr");
611 name = ptr + dget_len + extra_len;
612 read_buf(f, name, name_len);
613 if (dget_len == datum_len)
614 read_buf(f, ptr, dget_len);
615 else {
616 *ptr = XSTATE_ABBREV;
617 read_buf(f, ptr + 1, MAX_DIGEST_LEN);
618 }
619 #ifdef HAVE_LINUX_XATTRS
620 /* Non-root can only save the user namespace. */
621 if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
622 if (!am_root) {
623 free(ptr);
624 continue;
625 }
626 name -= RPRE_LEN;
627 name_len += RPRE_LEN;
628 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
629 }
630 #else
631 /* This OS only has a user namespace, so we either
632 * strip the user prefix, or we put a non-user
633 * namespace inside our rsync hierarchy. */
634 if (HAS_PREFIX(name, USER_PREFIX)) {
635 name += UPRE_LEN;
636 name_len -= UPRE_LEN;
637 } else if (am_root) {
638 name -= RPRE_LEN;
639 name_len += RPRE_LEN;
640 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
641 } else {
642 free(ptr);
643 continue;
644 }
645 #endif
646 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
647 if (preserve_xattrs < 2 && name_len > RPRE_LEN
648 && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
649 free(ptr);
650 continue;
651 }
652 rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
653 rxa->name = name;
654 rxa->datum = ptr;
655 rxa->name_len = name_len;
656 rxa->datum_len = datum_len;
657 }
658
659 ndx = rsync_xal_l.count; /* pre-incremented count */
660 rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
661
662 F_XATTR(file) = ndx;
663 }
664
665 /* Turn the xattr data in stat_x into cached xattr data, setting the index
666 * values in the file struct. */
667 void cache_xattr(struct file_struct *file, stat_x *sxp)
668 {
669 int ndx;
670
671 if (!sxp->xattr)
672 return;
673
674 ndx = find_matching_xattr(sxp->xattr);
675 if (ndx < 0)
676 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
677
678 F_XATTR(file) = ndx;
679 }
680
681 static int rsync_xal_set(const char *fname, item_list *xalp,
682 const char *fnamecmp, stat_x *sxp)
683 {
684 rsync_xa *rxas = xalp->items;
685 ssize_t list_len;
686 size_t i, len;
687 char *name, *ptr, sum[MAX_DIGEST_LEN];
688 int name_len, ret = 0;
689
690 /* This puts the current name list into the "namebuf" buffer. */
691 if ((list_len = get_xattr_names(fname)) < 0)
692 return -1;
693
694 for (i = 0; i < xalp->count; i++) {
695 name = rxas[i].name;
696
697 if (XATTR_ABBREV(rxas[i])) {
698 /* See if the fnamecmp version is identical. */
699 len = name_len = rxas[i].name_len;
700 if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
701 still_abbrev:
702 if (am_generator)
703 continue;
704 rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
705 rxas[i].name, full_fname(fname));
706 ret = -1;
707 continue;
708 }
709 if (len != rxas[i].datum_len) {
710 free(ptr);
711 goto still_abbrev;
712 }
713
714 sum_init(checksum_seed);
715 sum_update(ptr, len);
716 sum_end(sum);
717 if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
718 free(ptr);
719 goto still_abbrev;
720 }
721
722 if (fname == fnamecmp)
723 ; /* Value is already set when identical */
724 else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
725 rsyserr(FERROR_XFER, errno,
726 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
727 fname, name);
728 ret = -1;
729 } else /* make sure caller sets mtime */
730 sxp->st.st_mtime = (time_t)-1;
731
732 if (am_generator) { /* generator items stay abbreviated */
733 if (rxas[i].datum[0] == XSTATE_ABBREV)
734 rxas[i].datum[0] = XSTATE_LOCAL;
735 free(ptr);
736 continue;
737 }
738
739 memcpy(ptr + len, name, name_len);
740 free(rxas[i].datum);
741
742 rxas[i].name = name = ptr + len;
743 rxas[i].datum = ptr;
744 continue;
745 }
746
747 if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
748 rsyserr(FERROR_XFER, errno,
749 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
750 fname, name);
751 ret = -1;
752 } else /* make sure caller sets mtime */
753 sxp->st.st_mtime = (time_t)-1;
754 }
755
756 /* Remove any extraneous names. */
757 for (name = namebuf; list_len > 0; name += name_len) {
758 name_len = strlen(name) + 1;
759 list_len -= name_len;
760
761 #ifdef HAVE_LINUX_XATTRS
762 /* We always ignore the system namespace, and non-root
763 * ignores everything but the user namespace. */
764 if (am_root ? HAS_PREFIX(name, SYSTEM_PREFIX)
765 : !HAS_PREFIX(name, USER_PREFIX))
766 continue;
767 #endif
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)
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 = file->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