2 * Extended Attribute support for rsync.
3 * Written by Jay Fenlason, vaguely based on the ACLs patch.
5 * Copyright (C) 2004 Red Hat, Inc.
6 * Copyright (C) 2006-2009 Wayne Davison
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.
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.
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.
25 #include "lib/sysxattrs.h"
32 extern int am_generator;
35 extern int preserve_xattrs;
36 extern int checksum_seed;
38 #define RSYNC_XAL_INITIAL 5
39 #define RSYNC_XAL_LIST_INITIAL 100
41 #define MAX_FULL_DATUM 32
43 #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \
44 && strncmp(str, prfx, sizeof (prfx) - 1) == 0)
46 #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len)
48 #define XSTATE_ABBREV 1
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)
57 #ifdef HAVE_LINUX_XATTRS
58 #define MIGHT_NEED_RPRE (am_root < 0)
59 #define RSYNC_PREFIX USER_PREFIX "rsync."
61 #define MIGHT_NEED_RPRE am_root
62 #define RSYNC_PREFIX "rsync."
64 #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
66 #define XSTAT_SUFFIX "stat"
67 #define XSTAT_ATTR RSYNC_PREFIX "%" XSTAT_SUFFIX
68 #define XACC_ACL_SUFFIX "aacl"
69 #define XACC_ACL_ATTR RSYNC_PREFIX "%" XACC_ACL_SUFFIX
70 #define XDEF_ACL_SUFFIX "dacl"
71 #define XDEF_ACL_ATTR RSYNC_PREFIX "%" XDEF_ACL_SUFFIX
75 size_t datum_len, name_len;
79 static size_t namebuf_len = 0;
80 static char *namebuf = NULL;
82 static item_list empty_xattr = EMPTY_ITEM_LIST;
83 static item_list rsync_xal_l = EMPTY_ITEM_LIST;
85 static size_t prior_xattr_count = (size_t)-1;
87 /* ------------------------------------------------------------------------- */
89 static void rsync_xal_free(item_list *xalp)
92 rsync_xa *rxas = xalp->items;
94 for (i = 0; i < xalp->count; i++) {
96 /*free(rxas[i].name);*/
101 void free_xattr(stat_x *sxp)
105 rsync_xal_free(sxp->xattr);
110 static int rsync_xal_compare_names(const void *x1, const void *x2)
112 const rsync_xa *xa1 = x1;
113 const rsync_xa *xa2 = x2;
114 return strcmp(xa1->name, xa2->name);
117 static ssize_t get_xattr_names(const char *fname)
124 namebuf = new_array(char, namebuf_len);
126 out_of_memory("get_xattr_names");
130 /* The length returned includes all the '\0' terminators. */
131 list_len = sys_llistxattr(fname, namebuf, namebuf_len);
133 if ((size_t)list_len <= namebuf_len)
135 } else if (errno == ENOTSUP)
137 else if (errno != ERANGE) {
140 rsyserr(FERROR_XFER, errno,
141 "get_xattr_names: llistxattr(\"%s\",%s) failed",
142 fname, big_num(arg));
145 list_len = sys_llistxattr(fname, NULL, 0);
152 namebuf_len = list_len + 1024;
153 namebuf = new_array(char, namebuf_len);
155 out_of_memory("get_xattr_names");
161 /* On entry, the *len_ptr parameter contains the size of the extra space we
162 * should allocate when we create a buffer for the data. On exit, it contains
163 * the length of the datum. */
164 static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr,
165 int no_missing_error)
167 size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
168 size_t extra_len = *len_ptr;
171 *len_ptr = datum_len;
173 if (datum_len == (size_t)-1) {
174 if (errno == ENOTSUP || no_missing_error)
176 rsyserr(FERROR_XFER, errno,
177 "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed",
182 if (!datum_len && !extra_len)
183 extra_len = 1; /* request non-zero amount of memory */
184 if (datum_len + extra_len < datum_len)
185 overflow_exit("get_xattr_data");
186 if (!(ptr = new_array(char, datum_len + extra_len)))
187 out_of_memory("get_xattr_data");
190 size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
191 if (len != datum_len) {
192 if (len == (size_t)-1) {
193 rsyserr(FERROR_XFER, errno,
194 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
195 " failed", fname, name, (long)datum_len);
198 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
199 " returned %ld\n", fname, name,
200 (long)datum_len, (long)len);
210 static int rsync_xal_get(const char *fname, item_list *xalp)
212 ssize_t list_len, name_len;
213 size_t datum_len, name_offset;
215 #ifdef HAVE_LINUX_XATTRS
216 int user_only = am_sender ? 0 : !am_root;
221 /* This puts the name list into the "namebuf" buffer. */
222 if ((list_len = get_xattr_names(fname)) < 0)
225 for (name = namebuf; list_len > 0; name += name_len) {
226 name_len = strlen(name) + 1;
227 list_len -= name_len;
229 #ifdef HAVE_LINUX_XATTRS
230 /* We always ignore the system namespace, and non-root
231 * ignores everything but the user namespace. */
232 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
233 : HAS_PREFIX(name, SYSTEM_PREFIX))
237 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
238 if (name_len > RPRE_LEN && name[RPRE_LEN] == '%'
239 && HAS_PREFIX(name, RSYNC_PREFIX)) {
240 if ((am_sender && preserve_xattrs < 2)
242 && (strcmp(name+RPRE_LEN+1, XSTAT_SUFFIX) == 0
243 || strcmp(name+RPRE_LEN+1, XACC_ACL_SUFFIX) == 0
244 || strcmp(name+RPRE_LEN+1, XDEF_ACL_SUFFIX) == 0)))
248 datum_len = name_len; /* Pass extra size to get_xattr_data() */
249 if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
252 if (datum_len > MAX_FULL_DATUM) {
253 /* For large datums, we store a flag and a checksum. */
254 name_offset = 1 + MAX_DIGEST_LEN;
255 sum_init(checksum_seed);
256 sum_update(ptr, datum_len);
259 if (!(ptr = new_array(char, name_offset + name_len)))
260 out_of_memory("rsync_xal_get");
261 *ptr = XSTATE_ABBREV;
264 name_offset = datum_len;
266 rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
267 rxa->name = ptr + name_offset;
268 memcpy(rxa->name, name, name_len);
270 rxa->name_len = name_len;
271 rxa->datum_len = datum_len;
276 qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names);
277 for (rxa += count-1; count; count--, rxa--)
282 /* Read the xattr(s) for this filename. */
283 int get_xattr(const char *fname, stat_x *sxp)
285 sxp->xattr = new(item_list);
286 *sxp->xattr = empty_xattr;
288 #ifdef NO_SPECIAL_XATTRS
289 if (IS_SPECIAL(sxp->st.st_mode))
292 #ifdef NO_DEVICE_XATTRS
293 if (IS_DEVICE(sxp->st.st_mode))
296 #ifdef NO_SYMLINK_XATTRS
297 if (S_ISLNK(sxp->st.st_mode))
301 if (rsync_xal_get(fname, sxp->xattr) < 0) {
308 int copy_xattrs(const char *source, const char *dest)
310 ssize_t list_len, name_len;
313 #ifdef HAVE_LINUX_XATTRS
314 int user_only = am_sender ? 0 : am_root <= 0;
317 /* This puts the name list into the "namebuf" buffer. */
318 if ((list_len = get_xattr_names(source)) < 0)
321 for (name = namebuf; list_len > 0; name += name_len) {
322 name_len = strlen(name) + 1;
323 list_len -= name_len;
325 #ifdef HAVE_LINUX_XATTRS
326 /* We always ignore the system namespace, and non-root
327 * ignores everything but the user namespace. */
328 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
329 : HAS_PREFIX(name, SYSTEM_PREFIX))
334 if (!(ptr = get_xattr_data(source, name, &datum_len, 0)))
336 if (sys_lsetxattr(dest, name, ptr, datum_len) < 0) {
337 int save_errno = errno ? errno : EINVAL;
338 rsyserr(FERROR_XFER, errno,
339 "copy_xattrs: lsetxattr(\"%s\",\"%s\") failed",
350 static int find_matching_xattr(item_list *xalp)
353 item_list *lst = rsync_xal_l.items;
355 for (i = 0; i < rsync_xal_l.count; i++) {
356 rsync_xa *rxas1 = lst[i].items;
357 rsync_xa *rxas2 = xalp->items;
359 /* Wrong number of elements? */
360 if (lst[i].count != xalp->count)
362 /* any elements different? */
363 for (j = 0; j < xalp->count; j++) {
364 if (rxas1[j].name_len != rxas2[j].name_len
365 || rxas1[j].datum_len != rxas2[j].datum_len
366 || strcmp(rxas1[j].name, rxas2[j].name))
368 if (rxas1[j].datum_len > MAX_FULL_DATUM) {
369 if (memcmp(rxas1[j].datum + 1,
371 MAX_DIGEST_LEN) != 0)
374 if (memcmp(rxas1[j].datum, rxas2[j].datum,
379 /* no differences found. This is The One! */
380 if (j == xalp->count)
387 /* Store *xalp on the end of rsync_xal_l */
388 static void rsync_xal_store(item_list *xalp)
390 item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL);
391 /* Since the following call starts a new list, we know it will hold the
392 * entire initial-count, not just enough space for one new item. */
393 *new_lst = empty_xattr;
394 (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count);
395 memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa));
396 new_lst->count = xalp->count;
400 /* Send the make_xattr()-generated xattr list for this flist entry. */
401 int send_xattr(int f, stat_x *sxp)
403 int ndx = find_matching_xattr(sxp->xattr);
405 /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
406 write_varint(f, ndx + 1);
410 int count = sxp->xattr->count;
411 write_varint(f, count);
412 for (rxa = sxp->xattr->items; count--; rxa++) {
413 size_t name_len = rxa->name_len;
414 const char *name = rxa->name;
415 /* Strip the rsync prefix from disguised namespaces. */
416 if (name_len > RPRE_LEN
417 #ifdef HAVE_LINUX_XATTRS
420 && name[RPRE_LEN] != '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
422 name_len -= RPRE_LEN;
424 #ifndef HAVE_LINUX_XATTRS
426 /* Put everything else in the user namespace. */
427 name_len += UPRE_LEN;
430 write_varint(f, name_len);
431 write_varint(f, rxa->datum_len);
432 #ifndef HAVE_LINUX_XATTRS
433 if (name_len > rxa->name_len) {
434 write_buf(f, USER_PREFIX, UPRE_LEN);
435 name_len -= UPRE_LEN;
438 write_buf(f, name, name_len);
439 if (rxa->datum_len > MAX_FULL_DATUM)
440 write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
442 write_buf(f, rxa->datum, rxa->datum_len);
444 ndx = rsync_xal_l.count; /* pre-incremented count */
445 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
451 /* Return a flag indicating if we need to change a file's xattrs. If
452 * "find_all" is specified, also mark any abbreviated xattrs that we
453 * need so that send_xattr_request() can tell the sender about them. */
454 int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
456 item_list *lst = rsync_xal_l.items;
457 rsync_xa *snd_rxa, *rec_rxa;
458 int snd_cnt, rec_cnt;
459 int cmp, same, xattrs_equal = 1;
461 if (sxp && XATTR_READY(*sxp)) {
462 rec_rxa = sxp->xattr->items;
463 rec_cnt = sxp->xattr->count;
469 if (F_XATTR(file) >= 0)
470 lst += F_XATTR(file);
474 snd_rxa = lst->items;
475 snd_cnt = lst->count;
477 /* If the count of the sender's xattrs is different from our
478 * (receiver's) xattrs, the lists are not the same. */
479 if (snd_cnt != rec_cnt) {
486 cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
489 else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
490 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
491 && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
492 MAX_DIGEST_LEN) == 0;
493 /* Flag unrequested items that we need. */
494 if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
495 snd_rxa->datum[0] = XSTATE_TODO;
497 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
498 && memcmp(snd_rxa->datum, rec_rxa->datum,
499 snd_rxa->datum_len) == 0;
520 return !xattrs_equal;
523 /* When called by the generator (with a NULL fname), this tells the sender
524 * all the abbreviated xattr values we need. When called by the sender
525 * (with a non-NULL fname), we send all the extra xattr data it needs.
526 * The generator may also call with f_out < 0 to just change all the
527 * XSTATE_ABBREV states into XSTATE_DONE. */
528 void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
530 item_list *lst = rsync_xal_l.items;
531 int cnt, prior_req = 0;
534 lst += F_XATTR(file);
535 for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) {
536 if (rxa->datum_len <= MAX_FULL_DATUM)
538 switch (rxa->datum[0]) {
540 /* Items left abbreviated matched the sender's checksum, so
541 * the receiver will cache the local data for future use. */
543 rxa->datum[0] = XSTATE_DONE;
552 /* Flag that we handled this abbreviated item. */
553 rxa->datum[0] = XSTATE_DONE;
555 write_varint(f_out, rxa->num - prior_req);
556 prior_req = rxa->num;
562 /* Re-read the long datum. */
563 if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) {
564 rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname);
565 write_varint(f_out, 0);
569 write_varint(f_out, len); /* length might have changed! */
570 write_buf(f_out, ptr, len);
576 write_byte(f_out, 0); /* end the list */
579 /* When called by the sender, read the request from the generator and mark
580 * any needed xattrs with a flag that lets us know they need to be sent to
581 * the receiver. When called by the receiver, reads the sent data and
582 * stores it in place of its checksum. */
583 int recv_xattr_request(struct file_struct *file, int f_in)
585 item_list *lst = rsync_xal_l.items;
586 char *old_datum, *name;
588 int rel_pos, cnt, num, got_xattr_data = 0;
590 if (F_XATTR(file) < 0) {
591 rprintf(FERROR, "recv_xattr_request: internal data error!\n");
592 exit_cleanup(RERR_PROTOCOL);
594 lst += F_XATTR(file);
599 while ((rel_pos = read_varint(f_in)) != 0) {
601 while (cnt && rxa->num < num) {
605 if (!cnt || rxa->num != num) {
606 rprintf(FERROR, "[%s] could not find xattr #%d for %s\n",
607 who_am_i(), num, f_name(file, NULL));
608 exit_cleanup(RERR_PROTOCOL);
610 if (!XATTR_ABBREV(*rxa) || rxa->datum[0] != XSTATE_ABBREV) {
611 rprintf(FERROR, "[%s] internal abbrev error on %s (%s, len=%ld)!\n",
612 who_am_i(), f_name(file, NULL), rxa->name, (long)rxa->datum_len);
613 exit_cleanup(RERR_PROTOCOL);
617 rxa->datum[0] = XSTATE_TODO;
621 old_datum = rxa->datum;
622 rxa->datum_len = read_varint(f_in);
624 if (rxa->name_len + rxa->datum_len < rxa->name_len)
625 overflow_exit("recv_xattr_request");
626 rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
628 out_of_memory("recv_xattr_request");
629 name = rxa->datum + rxa->datum_len;
630 memcpy(name, rxa->name, rxa->name_len);
633 read_buf(f_in, rxa->datum, rxa->datum_len);
637 return got_xattr_data;
640 /* ------------------------------------------------------------------------- */
642 /* receive and build the rsync_xattr_lists */
643 void receive_xattr(int f, struct file_struct *file)
645 static item_list temp_xattr = EMPTY_ITEM_LIST;
647 #ifdef HAVE_LINUX_XATTRS
652 int ndx = read_varint(f);
654 if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
655 rprintf(FERROR, "receive_xattr: xa index %d out of"
656 " range for %s\n", ndx, f_name(file, NULL));
657 exit_cleanup(RERR_STREAMIO);
661 F_XATTR(file) = ndx - 1;
665 if ((count = read_varint(f)) != 0) {
666 (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
667 temp_xattr.count = 0;
670 for (num = 1; num <= count; num++) {
673 size_t name_len = read_varint(f);
674 size_t datum_len = read_varint(f);
675 size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
676 size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
677 if ((dget_len + extra_len < dget_len)
678 || (dget_len + extra_len + name_len < dget_len))
679 overflow_exit("receive_xattr");
680 ptr = new_array(char, dget_len + extra_len + name_len);
682 out_of_memory("receive_xattr");
683 name = ptr + dget_len + extra_len;
684 read_buf(f, name, name_len);
685 if (dget_len == datum_len)
686 read_buf(f, ptr, dget_len);
688 *ptr = XSTATE_ABBREV;
689 read_buf(f, ptr + 1, MAX_DIGEST_LEN);
691 #ifdef HAVE_LINUX_XATTRS
692 /* Non-root can only save the user namespace. */
693 if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
699 name_len += RPRE_LEN;
700 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
704 /* This OS only has a user namespace, so we either
705 * strip the user prefix, or we put a non-user
706 * namespace inside our rsync hierarchy. */
707 if (HAS_PREFIX(name, USER_PREFIX)) {
709 name_len -= UPRE_LEN;
710 } else if (am_root) {
712 name_len += RPRE_LEN;
713 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
719 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
720 if (preserve_xattrs < 2 && name_len > RPRE_LEN
721 && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
725 rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
728 rxa->name_len = name_len;
729 rxa->datum_len = datum_len;
733 if (need_sort && count > 1)
734 qsort(temp_xattr.items, count, sizeof (rsync_xa), rsync_xal_compare_names);
736 ndx = rsync_xal_l.count; /* pre-incremented count */
737 rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
742 /* Turn the xattr data in stat_x into cached xattr data, setting the index
743 * values in the file struct. */
744 void cache_tmp_xattr(struct file_struct *file, stat_x *sxp)
751 if (prior_xattr_count == (size_t)-1)
752 prior_xattr_count = rsync_xal_l.count;
753 ndx = find_matching_xattr(sxp->xattr);
755 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
760 void uncache_tmp_xattrs(void)
762 if (prior_xattr_count != (size_t)-1) {
763 item_list *xattr_item = rsync_xal_l.items;
764 item_list *xattr_start = xattr_item + prior_xattr_count;
765 xattr_item += rsync_xal_l.count;
766 rsync_xal_l.count = prior_xattr_count;
767 while (xattr_item-- > xattr_start) {
768 rsync_xal_free(xattr_item);
769 free(xattr_item->items);
771 prior_xattr_count = (size_t)-1;
775 static int rsync_xal_set(const char *fname, item_list *xalp,
776 const char *fnamecmp, stat_x *sxp)
778 rsync_xa *rxas = xalp->items;
781 char *name, *ptr, sum[MAX_DIGEST_LEN];
782 #ifdef HAVE_LINUX_XATTRS
783 int user_only = am_root <= 0;
788 /* This puts the current name list into the "namebuf" buffer. */
789 if ((list_len = get_xattr_names(fname)) < 0)
792 for (i = 0; i < xalp->count; i++) {
795 if (XATTR_ABBREV(rxas[i])) {
796 /* See if the fnamecmp version is identical. */
797 len = name_len = rxas[i].name_len;
798 if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
802 rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
803 rxas[i].name, full_fname(fname));
807 if (len != rxas[i].datum_len) {
812 sum_init(checksum_seed);
813 sum_update(ptr, len);
815 if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
820 if (fname == fnamecmp)
821 ; /* Value is already set when identical */
822 else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
823 rsyserr(FERROR_XFER, errno,
824 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
827 } else /* make sure caller sets mtime */
828 sxp->st.st_mtime = (time_t)-1;
830 if (am_generator) { /* generator items stay abbreviated */
835 memcpy(ptr + len, name, name_len);
838 rxas[i].name = name = ptr + len;
843 if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
844 rsyserr(FERROR_XFER, errno,
845 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
848 } else /* make sure caller sets mtime */
849 sxp->st.st_mtime = (time_t)-1;
852 /* Remove any extraneous names. */
853 for (name = namebuf; list_len > 0; name += name_len) {
854 name_len = strlen(name) + 1;
855 list_len -= name_len;
857 #ifdef HAVE_LINUX_XATTRS
858 /* We always ignore the system namespace, and non-root
859 * ignores everything but the user namespace. */
860 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
861 : HAS_PREFIX(name, SYSTEM_PREFIX))
864 if (am_root < 0 && name_len > RPRE_LEN
865 && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0)
868 for (i = 0; i < xalp->count; i++) {
869 if (strcmp(name, rxas[i].name) == 0)
872 if (i == xalp->count) {
873 if (sys_lremovexattr(fname, name) < 0) {
874 rsyserr(FERROR_XFER, errno,
875 "rsync_xal_set: lremovexattr(\"%s\",\"%s\") failed",
878 } else /* make sure caller sets mtime */
879 sxp->st.st_mtime = (time_t)-1;
886 /* Set extended attributes on indicated filename. */
887 int set_xattr(const char *fname, const struct file_struct *file,
888 const char *fnamecmp, stat_x *sxp)
891 item_list *lst = rsync_xal_l.items;
894 return 1; /* FIXME: --dry-run needs to compute this value */
896 if (read_only || list_only) {
901 #ifdef NO_SPECIAL_XATTRS
902 if (IS_SPECIAL(sxp->st.st_mode)) {
907 #ifdef NO_DEVICE_XATTRS
908 if (IS_DEVICE(sxp->st.st_mode)) {
913 #ifdef NO_SYMLINK_XATTRS
914 if (S_ISLNK(sxp->st.st_mode)) {
921 return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp);
925 char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
927 const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
928 *len_p = 0; /* no extra data alloc needed from get_xattr_data() */
929 return get_xattr_data(fname, name, len_p, 1);
932 int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
934 const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
935 if (sys_lsetxattr(fname, name, buf, buf_len) < 0) {
936 rsyserr(FERROR_XFER, errno,
937 "set_xattr_acl: lsetxattr(\"%s\",\"%s\") failed",
944 int del_def_xattr_acl(const char *fname)
946 return sys_lremovexattr(fname, XDEF_ACL_ATTR);
950 int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
952 int mode, rdev_major, rdev_minor, uid, gid, len;
955 if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
964 len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
967 len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
969 if (len >= (int)sizeof buf) {
974 if (errno == ENOTSUP || errno == ENOATTR)
976 if (errno == EPERM && S_ISLNK(fst->st_mode)) {
981 rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
982 XSTAT_ATTR, full_fname(fname));
987 if (sscanf(buf, "%o %d,%d %d:%d",
988 &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
989 rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n",
990 XSTAT_ATTR, full_fname(fname), buf);
991 exit_cleanup(RERR_FILEIO);
994 xst->st_mode = from_wire_mode(mode);
995 xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
1002 int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
1004 STRUCT_STAT fst, xst;
1011 if (read_only || list_only) {
1012 rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s",
1013 XSTAT_ATTR, full_fname(fname));
1017 if (x_lstat(fname, &fst, &xst) < 0) {
1018 rsyserr(FERROR_XFER, errno, "failed to re-stat %s",
1023 fst.st_mode &= (_S_IFMT | CHMOD_BITS);
1024 fmode = new_mode & (_S_IFMT | CHMOD_BITS);
1026 if (IS_DEVICE(fmode)) {
1027 uint32 *devp = F_RDEV_P(file);
1028 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1032 /* Dump the special permissions and enable full owner access. */
1033 mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS)
1034 | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
1035 if (fst.st_mode != mode)
1036 do_chmod(fname, mode);
1037 if (!IS_DEVICE(fst.st_mode))
1038 fst.st_rdev = 0; /* just in case */
1040 if (mode == fmode && fst.st_rdev == rdev
1041 && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) {
1042 /* xst.st_mode will be 0 if there's no current stat xattr */
1043 if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) {
1044 rsyserr(FERROR_XFER, errno,
1045 "delete of stat xattr failed for %s",
1052 if (xst.st_mode != fmode || xst.st_rdev != rdev
1053 || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
1055 int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u",
1056 to_wire_mode(fmode),
1057 (int)major(rdev), (int)minor(rdev),
1058 F_OWNER(file), F_GROUP(file));
1059 if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) {
1060 if (errno == EPERM && S_ISLNK(fst.st_mode))
1062 rsyserr(FERROR_XFER, errno,
1063 "failed to write xattr %s for %s",
1064 XSTAT_ATTR, full_fname(fname));
1072 int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1074 int ret = do_stat(fname, fst);
1075 if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1080 int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1082 int ret = do_lstat(fname, fst);
1083 if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1088 int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1090 int ret = do_fstat(fd, fst);
1091 if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
1096 #endif /* SUPPORT_XATTRS */