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) 2006-2013 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 preserve_links;
37 extern int preserve_devices;
38 extern int preserve_specials;
39 extern int checksum_seed;
41 #define RSYNC_XAL_INITIAL 5
42 #define RSYNC_XAL_LIST_INITIAL 100
44 #define MAX_FULL_DATUM 32
46 #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \
47 && strncmp(str, prfx, sizeof (prfx) - 1) == 0)
49 #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len)
51 #define XSTATE_ABBREV 1
55 #define USER_PREFIX "user."
56 #define UPRE_LEN ((int)sizeof USER_PREFIX - 1)
57 #define SYSTEM_PREFIX "system."
58 #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1)
60 #ifdef HAVE_LINUX_XATTRS
61 #define MIGHT_NEED_RPRE (am_root < 0)
62 #define RSYNC_PREFIX USER_PREFIX "rsync."
64 #define MIGHT_NEED_RPRE am_root
65 #define RSYNC_PREFIX "rsync."
67 #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
69 #define XSTAT_SUFFIX "stat"
70 #define XSTAT_ATTR RSYNC_PREFIX "%" XSTAT_SUFFIX
71 #define XACC_ACL_SUFFIX "aacl"
72 #define XACC_ACL_ATTR RSYNC_PREFIX "%" XACC_ACL_SUFFIX
73 #define XDEF_ACL_SUFFIX "dacl"
74 #define XDEF_ACL_ATTR RSYNC_PREFIX "%" XDEF_ACL_SUFFIX
78 size_t datum_len, name_len;
82 static size_t namebuf_len = 0;
83 static char *namebuf = NULL;
85 static item_list empty_xattr = EMPTY_ITEM_LIST;
86 static item_list rsync_xal_l = EMPTY_ITEM_LIST;
88 static size_t prior_xattr_count = (size_t)-1;
90 /* ------------------------------------------------------------------------- */
92 static void rsync_xal_free(item_list *xalp)
95 rsync_xa *rxas = xalp->items;
100 for (i = 0; i < xalp->count; i++) {
102 /*free(rxas[i].name);*/
107 void free_xattr(stat_x *sxp)
111 rsync_xal_free(sxp->xattr);
116 static int rsync_xal_compare_names(const void *x1, const void *x2)
118 const rsync_xa *xa1 = x1;
119 const rsync_xa *xa2 = x2;
120 return strcmp(xa1->name, xa2->name);
123 static ssize_t get_xattr_names(const char *fname)
130 namebuf = new_array(char, namebuf_len);
132 out_of_memory("get_xattr_names");
136 /* The length returned includes all the '\0' terminators. */
137 list_len = sys_llistxattr(fname, namebuf, namebuf_len);
139 if ((size_t)list_len <= namebuf_len)
141 } else if (errno == ENOTSUP)
143 else if (errno != ERANGE) {
146 rsyserr(FERROR_XFER, errno,
147 "get_xattr_names: llistxattr(\"%s\",%s) failed",
148 full_fname(fname), big_num(arg));
151 list_len = sys_llistxattr(fname, NULL, 0);
158 namebuf_len = list_len + 1024;
159 namebuf = new_array(char, namebuf_len);
161 out_of_memory("get_xattr_names");
167 /* On entry, the *len_ptr parameter contains the size of the extra space we
168 * should allocate when we create a buffer for the data. On exit, it contains
169 * the length of the datum. */
170 static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr,
171 int no_missing_error)
173 size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
174 size_t extra_len = *len_ptr;
177 *len_ptr = datum_len;
179 if (datum_len == (size_t)-1) {
180 if (errno == ENOTSUP || no_missing_error)
182 rsyserr(FERROR_XFER, errno,
183 "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed",
184 full_fname(fname), name);
188 if (!datum_len && !extra_len)
189 extra_len = 1; /* request non-zero amount of memory */
190 if (datum_len + extra_len < datum_len)
191 overflow_exit("get_xattr_data");
192 if (!(ptr = new_array(char, datum_len + extra_len)))
193 out_of_memory("get_xattr_data");
196 size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
197 if (len != datum_len) {
198 if (len == (size_t)-1) {
199 rsyserr(FERROR_XFER, errno,
200 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
201 " failed", full_fname(fname), name, (long)datum_len);
204 "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
205 " returned %ld\n", full_fname(fname), name,
206 (long)datum_len, (long)len);
216 static int rsync_xal_get(const char *fname, item_list *xalp)
218 ssize_t list_len, name_len;
219 size_t datum_len, name_offset;
221 #ifdef HAVE_LINUX_XATTRS
222 int user_only = am_sender ? 0 : !am_root;
227 /* This puts the name list into the "namebuf" buffer. */
228 if ((list_len = get_xattr_names(fname)) < 0)
231 for (name = namebuf; list_len > 0; name += name_len) {
232 name_len = strlen(name) + 1;
233 list_len -= name_len;
235 #ifdef HAVE_LINUX_XATTRS
236 /* We always ignore the system namespace, and non-root
237 * ignores everything but the user namespace. */
238 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
239 : HAS_PREFIX(name, SYSTEM_PREFIX))
243 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
244 if (name_len > RPRE_LEN && name[RPRE_LEN] == '%'
245 && HAS_PREFIX(name, RSYNC_PREFIX)) {
246 if ((am_sender && preserve_xattrs < 2)
248 && (strcmp(name+RPRE_LEN+1, XSTAT_SUFFIX) == 0
249 || strcmp(name+RPRE_LEN+1, XACC_ACL_SUFFIX) == 0
250 || strcmp(name+RPRE_LEN+1, XDEF_ACL_SUFFIX) == 0)))
254 datum_len = name_len; /* Pass extra size to get_xattr_data() */
255 if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
258 if (datum_len > MAX_FULL_DATUM) {
259 /* For large datums, we store a flag and a checksum. */
260 name_offset = 1 + MAX_DIGEST_LEN;
261 sum_init(checksum_seed);
262 sum_update(ptr, datum_len);
265 if (!(ptr = new_array(char, name_offset + name_len)))
266 out_of_memory("rsync_xal_get");
267 *ptr = XSTATE_ABBREV;
270 name_offset = datum_len;
272 rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
273 rxa->name = ptr + name_offset;
274 memcpy(rxa->name, name, name_len);
276 rxa->name_len = name_len;
277 rxa->datum_len = datum_len;
282 qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names);
283 for (rxa += count-1; count; count--, rxa--)
288 /* Read the xattr(s) for this filename. */
289 int get_xattr(const char *fname, stat_x *sxp)
291 sxp->xattr = new(item_list);
292 *sxp->xattr = empty_xattr;
294 if (S_ISREG(sxp->st.st_mode) || S_ISDIR(sxp->st.st_mode)) {
295 /* Everyone supports this. */
296 } else if (S_ISLNK(sxp->st.st_mode)) {
297 #ifndef NO_SYMLINK_XATTRS
301 } else if (IS_SPECIAL(sxp->st.st_mode)) {
302 #ifndef NO_SPECIAL_XATTRS
303 if (!preserve_specials)
306 } else if (IS_DEVICE(sxp->st.st_mode)) {
307 #ifndef NO_DEVICE_XATTRS
308 if (!preserve_devices)
313 if (rsync_xal_get(fname, sxp->xattr) < 0) {
320 int copy_xattrs(const char *source, const char *dest)
322 ssize_t list_len, name_len;
325 #ifdef HAVE_LINUX_XATTRS
326 int user_only = am_sender ? 0 : am_root <= 0;
329 /* This puts the name list into the "namebuf" buffer. */
330 if ((list_len = get_xattr_names(source)) < 0)
333 for (name = namebuf; list_len > 0; name += name_len) {
334 name_len = strlen(name) + 1;
335 list_len -= name_len;
337 #ifdef HAVE_LINUX_XATTRS
338 /* We always ignore the system namespace, and non-root
339 * ignores everything but the user namespace. */
340 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
341 : HAS_PREFIX(name, SYSTEM_PREFIX))
346 if (!(ptr = get_xattr_data(source, name, &datum_len, 0)))
348 if (sys_lsetxattr(dest, name, ptr, datum_len) < 0) {
349 int save_errno = errno ? errno : EINVAL;
350 rsyserr(FERROR_XFER, errno,
351 "copy_xattrs: lsetxattr(\"%s\",\"%s\") failed",
352 full_fname(dest), name);
362 static int find_matching_xattr(item_list *xalp)
365 item_list *lst = rsync_xal_l.items;
367 for (i = 0; i < rsync_xal_l.count; i++) {
368 rsync_xa *rxas1 = lst[i].items;
369 rsync_xa *rxas2 = xalp->items;
371 /* Wrong number of elements? */
372 if (lst[i].count != xalp->count)
374 /* any elements different? */
375 for (j = 0; j < xalp->count; j++) {
376 if (rxas1[j].name_len != rxas2[j].name_len
377 || rxas1[j].datum_len != rxas2[j].datum_len
378 || strcmp(rxas1[j].name, rxas2[j].name))
380 if (rxas1[j].datum_len > MAX_FULL_DATUM) {
381 if (memcmp(rxas1[j].datum + 1,
383 MAX_DIGEST_LEN) != 0)
386 if (memcmp(rxas1[j].datum, rxas2[j].datum,
391 /* no differences found. This is The One! */
392 if (j == xalp->count)
399 /* Store *xalp on the end of rsync_xal_l */
400 static void rsync_xal_store(item_list *xalp)
402 item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL);
403 /* Since the following call starts a new list, we know it will hold the
404 * entire initial-count, not just enough space for one new item. */
405 *new_lst = empty_xattr;
406 (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count);
407 memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa));
408 new_lst->count = xalp->count;
412 /* Send the make_xattr()-generated xattr list for this flist entry. */
413 int send_xattr(int f, stat_x *sxp)
415 int ndx = find_matching_xattr(sxp->xattr);
417 /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
418 write_varint(f, ndx + 1);
422 int count = sxp->xattr->count;
423 write_varint(f, count);
424 for (rxa = sxp->xattr->items; count--; rxa++) {
425 size_t name_len = rxa->name_len;
426 const char *name = rxa->name;
427 /* Strip the rsync prefix from disguised namespaces. */
428 if (name_len > RPRE_LEN
429 #ifdef HAVE_LINUX_XATTRS
432 && name[RPRE_LEN] != '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
434 name_len -= RPRE_LEN;
436 #ifndef HAVE_LINUX_XATTRS
438 /* Put everything else in the user namespace. */
439 name_len += UPRE_LEN;
442 write_varint(f, name_len);
443 write_varint(f, rxa->datum_len);
444 #ifndef HAVE_LINUX_XATTRS
445 if (name_len > rxa->name_len) {
446 write_buf(f, USER_PREFIX, UPRE_LEN);
447 name_len -= UPRE_LEN;
450 write_buf(f, name, name_len);
451 if (rxa->datum_len > MAX_FULL_DATUM)
452 write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
454 write_bigbuf(f, rxa->datum, rxa->datum_len);
456 ndx = rsync_xal_l.count; /* pre-incremented count */
457 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
463 /* Return a flag indicating if we need to change a file's xattrs. If
464 * "find_all" is specified, also mark any abbreviated xattrs that we
465 * need so that send_xattr_request() can tell the sender about them. */
466 int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
468 item_list *lst = rsync_xal_l.items;
469 rsync_xa *snd_rxa, *rec_rxa;
470 int snd_cnt, rec_cnt;
471 int cmp, same, xattrs_equal = 1;
473 if (sxp && XATTR_READY(*sxp)) {
474 rec_rxa = sxp->xattr->items;
475 rec_cnt = sxp->xattr->count;
481 if (F_XATTR(file) >= 0)
482 lst += F_XATTR(file);
486 snd_rxa = lst->items;
487 snd_cnt = lst->count;
489 /* If the count of the sender's xattrs is different from our
490 * (receiver's) xattrs, the lists are not the same. */
491 if (snd_cnt != rec_cnt) {
498 cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
501 else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
502 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
503 && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
504 MAX_DIGEST_LEN) == 0;
505 /* Flag unrequested items that we need. */
506 if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
507 snd_rxa->datum[0] = XSTATE_TODO;
509 same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
510 && memcmp(snd_rxa->datum, rec_rxa->datum,
511 snd_rxa->datum_len) == 0;
532 return !xattrs_equal;
535 /* When called by the generator (with a NULL fname), this tells the sender
536 * all the abbreviated xattr values we need. When called by the sender
537 * (with a non-NULL fname), we send all the extra xattr data it needs.
538 * The generator may also call with f_out < 0 to just change all the
539 * XSTATE_ABBREV states into XSTATE_DONE. */
540 void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
542 item_list *lst = rsync_xal_l.items;
543 int cnt, prior_req = 0;
546 lst += F_XATTR(file);
547 for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) {
548 if (rxa->datum_len <= MAX_FULL_DATUM)
550 switch (rxa->datum[0]) {
552 /* Items left abbreviated matched the sender's checksum, so
553 * the receiver will cache the local data for future use. */
555 rxa->datum[0] = XSTATE_DONE;
564 /* Flag that we handled this abbreviated item. */
565 rxa->datum[0] = XSTATE_DONE;
567 write_varint(f_out, rxa->num - prior_req);
568 prior_req = rxa->num;
574 /* Re-read the long datum. */
575 if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) {
576 rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname);
577 write_varint(f_out, 0);
581 write_varint(f_out, len); /* length might have changed! */
582 write_bigbuf(f_out, ptr, len);
588 write_byte(f_out, 0); /* end the list */
591 /* When called by the sender, read the request from the generator and mark
592 * any needed xattrs with a flag that lets us know they need to be sent to
593 * the receiver. When called by the receiver, reads the sent data and
594 * stores it in place of its checksum. */
595 int recv_xattr_request(struct file_struct *file, int f_in)
597 item_list *lst = rsync_xal_l.items;
598 char *old_datum, *name;
600 int rel_pos, cnt, num, got_xattr_data = 0;
602 if (F_XATTR(file) < 0) {
603 rprintf(FERROR, "recv_xattr_request: internal data error!\n");
604 exit_cleanup(RERR_PROTOCOL);
606 lst += F_XATTR(file);
611 while ((rel_pos = read_varint(f_in)) != 0) {
613 while (cnt && rxa->num < num) {
617 if (!cnt || rxa->num != num) {
618 rprintf(FERROR, "[%s] could not find xattr #%d for %s\n",
619 who_am_i(), num, f_name(file, NULL));
620 exit_cleanup(RERR_PROTOCOL);
622 if (!XATTR_ABBREV(*rxa) || rxa->datum[0] != XSTATE_ABBREV) {
623 rprintf(FERROR, "[%s] internal abbrev error on %s (%s, len=%ld)!\n",
624 who_am_i(), f_name(file, NULL), rxa->name, (long)rxa->datum_len);
625 exit_cleanup(RERR_PROTOCOL);
629 rxa->datum[0] = XSTATE_TODO;
633 old_datum = rxa->datum;
634 rxa->datum_len = read_varint(f_in);
636 if (rxa->name_len + rxa->datum_len < rxa->name_len)
637 overflow_exit("recv_xattr_request");
638 rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
640 out_of_memory("recv_xattr_request");
641 name = rxa->datum + rxa->datum_len;
642 memcpy(name, rxa->name, rxa->name_len);
645 read_buf(f_in, rxa->datum, rxa->datum_len);
649 return got_xattr_data;
652 /* ------------------------------------------------------------------------- */
654 /* receive and build the rsync_xattr_lists */
655 void receive_xattr(int f, struct file_struct *file)
657 static item_list temp_xattr = EMPTY_ITEM_LIST;
659 #ifdef HAVE_LINUX_XATTRS
664 int ndx = read_varint(f);
666 if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
667 rprintf(FERROR, "receive_xattr: xa index %d out of"
668 " range for %s\n", ndx, f_name(file, NULL));
669 exit_cleanup(RERR_STREAMIO);
673 F_XATTR(file) = ndx - 1;
677 if ((count = read_varint(f)) != 0) {
678 (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
679 temp_xattr.count = 0;
682 for (num = 1; num <= count; num++) {
685 size_t name_len = read_varint(f);
686 size_t datum_len = read_varint(f);
687 size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
688 size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
689 if ((dget_len + extra_len < dget_len)
690 || (dget_len + extra_len + name_len < dget_len))
691 overflow_exit("receive_xattr");
692 ptr = new_array(char, dget_len + extra_len + name_len);
694 out_of_memory("receive_xattr");
695 name = ptr + dget_len + extra_len;
696 read_buf(f, name, name_len);
697 if (dget_len == datum_len)
698 read_buf(f, ptr, dget_len);
700 *ptr = XSTATE_ABBREV;
701 read_buf(f, ptr + 1, MAX_DIGEST_LEN);
703 #ifdef HAVE_LINUX_XATTRS
704 /* Non-root can only save the user namespace. */
705 if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
711 name_len += RPRE_LEN;
712 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
716 /* This OS only has a user namespace, so we either
717 * strip the user prefix, or we put a non-user
718 * namespace inside our rsync hierarchy. */
719 if (HAS_PREFIX(name, USER_PREFIX)) {
721 name_len -= UPRE_LEN;
722 } else if (am_root) {
724 name_len += RPRE_LEN;
725 memcpy(name, RSYNC_PREFIX, RPRE_LEN);
731 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
732 if (preserve_xattrs < 2 && name_len > RPRE_LEN
733 && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
737 rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
740 rxa->name_len = name_len;
741 rxa->datum_len = datum_len;
745 if (need_sort && count > 1)
746 qsort(temp_xattr.items, count, sizeof (rsync_xa), rsync_xal_compare_names);
748 ndx = rsync_xal_l.count; /* pre-incremented count */
749 rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
754 /* Turn the xattr data in stat_x into cached xattr data, setting the index
755 * values in the file struct. */
756 void cache_tmp_xattr(struct file_struct *file, stat_x *sxp)
763 if (prior_xattr_count == (size_t)-1)
764 prior_xattr_count = rsync_xal_l.count;
765 ndx = find_matching_xattr(sxp->xattr);
767 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
772 void uncache_tmp_xattrs(void)
774 if (prior_xattr_count != (size_t)-1) {
775 item_list *xattr_item = rsync_xal_l.items;
776 item_list *xattr_start = xattr_item + prior_xattr_count;
777 xattr_item += rsync_xal_l.count;
778 rsync_xal_l.count = prior_xattr_count;
779 while (xattr_item-- > xattr_start)
780 rsync_xal_free(xattr_item);
781 prior_xattr_count = (size_t)-1;
785 static int rsync_xal_set(const char *fname, item_list *xalp,
786 const char *fnamecmp, stat_x *sxp)
788 rsync_xa *rxas = xalp->items;
791 char *name, *ptr, sum[MAX_DIGEST_LEN];
792 #ifdef HAVE_LINUX_XATTRS
793 int user_only = am_root <= 0;
798 /* This puts the current name list into the "namebuf" buffer. */
799 if ((list_len = get_xattr_names(fname)) < 0)
802 for (i = 0; i < xalp->count; i++) {
805 if (XATTR_ABBREV(rxas[i])) {
806 /* See if the fnamecmp version is identical. */
807 len = name_len = rxas[i].name_len;
808 if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
812 rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
813 rxas[i].name, full_fname(fname));
817 if (len != rxas[i].datum_len) {
822 sum_init(checksum_seed);
823 sum_update(ptr, len);
825 if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
830 if (fname == fnamecmp)
831 ; /* Value is already set when identical */
832 else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
833 rsyserr(FERROR_XFER, errno,
834 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
835 full_fname(fname), name);
837 } else /* make sure caller sets mtime */
838 sxp->st.st_mtime = (time_t)-1;
840 if (am_generator) { /* generator items stay abbreviated */
845 memcpy(ptr + len, name, name_len);
848 rxas[i].name = name = ptr + len;
853 if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
854 rsyserr(FERROR_XFER, errno,
855 "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
856 full_fname(fname), name);
858 } else /* make sure caller sets mtime */
859 sxp->st.st_mtime = (time_t)-1;
862 /* Remove any extraneous names. */
863 for (name = namebuf; list_len > 0; name += name_len) {
864 name_len = strlen(name) + 1;
865 list_len -= name_len;
867 #ifdef HAVE_LINUX_XATTRS
868 /* We always ignore the system namespace, and non-root
869 * ignores everything but the user namespace. */
870 if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
871 : HAS_PREFIX(name, SYSTEM_PREFIX))
874 if (am_root < 0 && name_len > RPRE_LEN
875 && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0)
878 for (i = 0; i < xalp->count; i++) {
879 if (strcmp(name, rxas[i].name) == 0)
882 if (i == xalp->count) {
883 if (sys_lremovexattr(fname, name) < 0) {
884 rsyserr(FERROR_XFER, errno,
885 "rsync_xal_set: lremovexattr(\"%s\",\"%s\") failed",
886 full_fname(fname), name);
888 } else /* make sure caller sets mtime */
889 sxp->st.st_mtime = (time_t)-1;
896 /* Set extended attributes on indicated filename. */
897 int set_xattr(const char *fname, const struct file_struct *file,
898 const char *fnamecmp, stat_x *sxp)
901 item_list *lst = rsync_xal_l.items;
904 return 1; /* FIXME: --dry-run needs to compute this value */
906 if (read_only || list_only) {
911 #ifdef NO_SPECIAL_XATTRS
912 if (IS_SPECIAL(sxp->st.st_mode)) {
917 #ifdef NO_DEVICE_XATTRS
918 if (IS_DEVICE(sxp->st.st_mode)) {
923 #ifdef NO_SYMLINK_XATTRS
924 if (S_ISLNK(sxp->st.st_mode)) {
931 return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp);
935 char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
937 const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
938 *len_p = 0; /* no extra data alloc needed from get_xattr_data() */
939 return get_xattr_data(fname, name, len_p, 1);
942 int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
944 const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
945 if (sys_lsetxattr(fname, name, buf, buf_len) < 0) {
946 rsyserr(FERROR_XFER, errno,
947 "set_xattr_acl: lsetxattr(\"%s\",\"%s\") failed",
948 full_fname(fname), name);
954 int del_def_xattr_acl(const char *fname)
956 return sys_lremovexattr(fname, XDEF_ACL_ATTR);
960 int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
962 int mode, rdev_major, rdev_minor, uid, gid, len;
965 if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
974 len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
977 len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
979 if (len >= (int)sizeof buf) {
984 if (errno == ENOTSUP || errno == ENOATTR)
986 if (errno == EPERM && S_ISLNK(fst->st_mode)) {
991 rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
992 XSTAT_ATTR, full_fname(fname));
997 if (sscanf(buf, "%o %d,%d %d:%d",
998 &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
999 rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n",
1000 XSTAT_ATTR, full_fname(fname), buf);
1001 exit_cleanup(RERR_FILEIO);
1004 xst->st_mode = from_wire_mode(mode);
1005 xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
1012 int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
1014 STRUCT_STAT fst, xst;
1021 if (read_only || list_only) {
1022 rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s",
1023 XSTAT_ATTR, full_fname(fname));
1027 if (x_lstat(fname, &fst, &xst) < 0) {
1028 rsyserr(FERROR_XFER, errno, "failed to re-stat %s",
1033 fst.st_mode &= (_S_IFMT | CHMOD_BITS);
1034 fmode = new_mode & (_S_IFMT | CHMOD_BITS);
1036 if (IS_DEVICE(fmode)) {
1037 uint32 *devp = F_RDEV_P(file);
1038 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1042 /* Dump the special permissions and enable full owner access. */
1043 mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS)
1044 | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
1045 if (fst.st_mode != mode)
1046 do_chmod(fname, mode);
1047 if (!IS_DEVICE(fst.st_mode))
1048 fst.st_rdev = 0; /* just in case */
1050 if (mode == fmode && fst.st_rdev == rdev
1051 && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) {
1052 /* xst.st_mode will be 0 if there's no current stat xattr */
1053 if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) {
1054 rsyserr(FERROR_XFER, errno,
1055 "delete of stat xattr failed for %s",
1062 if (xst.st_mode != fmode || xst.st_rdev != rdev
1063 || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
1065 int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u",
1066 to_wire_mode(fmode),
1067 (int)major(rdev), (int)minor(rdev),
1068 F_OWNER(file), F_GROUP(file));
1069 if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) {
1070 if (errno == EPERM && S_ISLNK(fst.st_mode))
1072 rsyserr(FERROR_XFER, errno,
1073 "failed to write xattr %s for %s",
1074 XSTAT_ATTR, full_fname(fname));
1082 int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1084 int ret = do_stat(fname, fst);
1085 if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1090 int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1092 int ret = do_lstat(fname, fst);
1093 if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1098 int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1100 int ret = do_fstat(fd, fst);
1101 if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
1106 #endif /* SUPPORT_XATTRS */