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) 2006-2020 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 "inums.h"
25: #include "lib/sysxattrs.h"
26:
27: #ifdef SUPPORT_XATTRS
28:
29: extern int dry_run;
30: extern int am_root;
31: extern int am_sender;
32: extern int am_generator;
33: extern int read_only;
34: extern int list_only;
35: extern int preserve_xattrs;
36: extern int preserve_hfs_compression;
37: extern int preserve_links;
38: extern int preserve_devices;
39: extern int preserve_specials;
40: extern int checksum_type;
41: extern int checksum_seed;
42: extern int flist_csum_len;
43: extern int saw_xattr_filter;
44:
45: #define RSYNC_XAL_INITIAL 5
46: #define RSYNC_XAL_LIST_INITIAL 100
47:
48: #define GXD_NO_MISSING_ERROR (1<<0)
49: #define GXD_OMIT_COMPRESSED (1<<1)
50: #define GXD_FILE_IS_COMPRESSED (1<<2)
51:
52: #define MAX_FULL_DATUM 32
53:
54: #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) && strncmp(str, prfx, sizeof (prfx) - 1) == 0)
55:
56: #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len)
57:
58: #define XSTATE_ABBREV 1
59: #define XSTATE_DONE 2
60: #define XSTATE_TODO 3
61:
62: #define USER_PREFIX "user."
63: #define UPRE_LEN ((int)sizeof USER_PREFIX - 1)
64: #define SYSTEM_PREFIX "system."
65: #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1)
66:
67: #ifdef HAVE_LINUX_XATTRS
68: #define MIGHT_NEED_RPRE (am_root <= 0)
69: #define RSYNC_PREFIX USER_PREFIX "rsync."
70: #else
71: #define MIGHT_NEED_RPRE am_root
72: #define RSYNC_PREFIX "rsync."
73: #endif
74: #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
75:
76: #define XSTAT_SUFFIX "stat"
77: #define XSTAT_ATTR RSYNC_PREFIX "%" XSTAT_SUFFIX
78: #define XACC_ACL_SUFFIX "aacl"
79: #define XACC_ACL_ATTR RSYNC_PREFIX "%" XACC_ACL_SUFFIX
80: #define XDEF_ACL_SUFFIX "dacl"
81: #define XDEF_ACL_ATTR RSYNC_PREFIX "%" XDEF_ACL_SUFFIX
82: #define MD4_SUFFIX "md4"
83: #define MD4_ATTR RSYNC_PREFIX "%" MD4_SUFFIX
84: #define MD5_SUFFIX "md5"
85: #define MD5_ATTR RSYNC_PREFIX "%" MD5_SUFFIX
86:
87: #define APPLE_PREFIX "com.apple."
88: #define APLPRE_LEN ((int)sizeof APPLE_PREFIX - 1)
89: #define DECMPFS_SUFFIX "decmpfs"
90: #define RESOURCEFORK_SUFFIX "ResourceFork"
91:
92: #define UNREAD_DATA ((char *)1)
93:
94: #if MAX_DIGEST_LEN < SIZEOF_TIME_T
95: #error MAX_DIGEST_LEN is too small to hold an mtime
96: #endif
97:
98: typedef struct {
99: char *datum, *name;
100: size_t datum_len, name_len;
101: int num;
102: } rsync_xa;
103:
104: struct _rsync_xa_list;
105:
106: typedef struct _rsync_xa_list_ref {
107: struct _rsync_xa_list_ref *next;
108: int ndx;
109: } rsync_xa_list_ref;
110:
111: typedef struct _rsync_xa_list {
112: int ndx;
113: int64 key;
114: item_list xa_items;
115: } rsync_xa_list;
116:
117: static size_t namebuf_len = 0;
118: static char *namebuf = NULL;
119:
120: static const rsync_xa_list empty_xa_list = {
121: .xa_items = EMPTY_ITEM_LIST,
122: };
123: static const item_list empty_xattr = EMPTY_ITEM_LIST;
124: static item_list rsync_xal_l = EMPTY_ITEM_LIST;
125: static struct hashtable *rsync_xal_h = NULL;
126:
127: static size_t prior_xattr_count = (size_t)-1;
128:
129: /* ------------------------------------------------------------------------- */
130:
131: static void rsync_xal_free(item_list *xalp)
132: {
133: size_t i;
134: rsync_xa *rxas = xalp->items;
135:
136: if (!xalp->malloced)
137: return;
138:
139: for (i = 0; i < xalp->count; i++) {
140: free(rxas[i].datum);
141: /*free(rxas[i].name);*/
142: }
143: free(xalp->items);
144: }
145:
146: void free_xattr(stat_x *sxp)
147: {
148: if (!sxp->xattr)
149: return;
150: rsync_xal_free(sxp->xattr);
151: free(sxp->xattr);
152: sxp->xattr = NULL;
153: }
154:
155: static int rsync_xal_compare_names(const void *x1, const void *x2)
156: {
157: const rsync_xa *xa1 = x1;
158: const rsync_xa *xa2 = x2;
159: return strcmp(xa1->name, xa2->name);
160: }
161:
162: static ssize_t get_xattr_names(const char *fname)
163: {
164: ssize_t list_len;
165: int64 arg;
166:
167: if (!namebuf) {
168: namebuf_len = 1024;
169: namebuf = new_array(char, namebuf_len);
170: }
171:
172: while (1) {
173: /* The length returned includes all the '\0' terminators. */
174: list_len = sys_llistxattr(fname, namebuf, namebuf_len);
175: if (list_len >= 0) {
176: if ((size_t)list_len <= namebuf_len)
177: break;
178: } else if (errno == ENOTSUP)
179: return 0;
180: else if (errno != ERANGE) {
181: arg = namebuf_len;
182: got_error:
183: rsyserr(FERROR_XFER, errno,
184: "get_xattr_names: llistxattr(%s,%s) failed",
185: full_fname(fname), big_num(arg));
186: return -1;
187: }
188: list_len = sys_llistxattr(fname, NULL, 0);
189: if (list_len < 0) {
190: arg = 0;
191: goto got_error;
192: }
193: if (namebuf_len)
194: free(namebuf);
195: namebuf_len = list_len + 1024;
196: namebuf = new_array(char, namebuf_len);
197: }
198:
199: return list_len;
200: }
201:
202: /* On entry, the *len_ptr parameter contains the size of the extra space we
203: * should allocate when we create a buffer for the data. On exit, it contains
204: * the length of the datum. */
205: static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr, int flags)
206: {
207: size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
208: size_t extra_len = *len_ptr;
209: char *ptr;
210:
211: *len_ptr = datum_len;
212:
213: if (datum_len == (size_t)-1) {
214: if (errno == ENOTSUP || flags & GXD_NO_MISSING_ERROR)
215: return NULL;
216: rsyserr(FERROR_XFER, errno,
217: "get_xattr_data: lgetxattr(%s,\"%s\",0) failed",
218: full_fname(fname), name);
219: return NULL;
220: }
221:
222: if (flags & GXD_OMIT_COMPRESSED && datum_len > MAX_FULL_DATUM
223: && HAS_PREFIX(name, APPLE_PREFIX)
224: && (strcmp(name+APLPRE_LEN, DECMPFS_SUFFIX) == 0
225: || (flags & GXD_FILE_IS_COMPRESSED && strcmp(name+APLPRE_LEN, RESOURCEFORK_SUFFIX) == 0))) {
226: /* If we are omitting compress-file-related data, we don't want to
227: * actually read this data. */
228: return UNREAD_DATA;
229: }
230:
231: if (!datum_len && !extra_len)
232: extra_len = 1; /* request non-zero amount of memory */
233: if (SIZE_MAX - datum_len < extra_len)
234: overflow_exit("get_xattr_data");
235: ptr = new_array(char, datum_len + extra_len);
236:
237: if (datum_len) {
238: size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
239: if (len != datum_len) {
240: if (len == (size_t)-1) {
241: rsyserr(FERROR_XFER, errno,
242: "get_xattr_data: lgetxattr(%s,\"%s\",%ld) failed",
243: full_fname(fname), name, (long)datum_len);
244: } else {
245: rprintf(FERROR_XFER,
246: "get_xattr_data: lgetxattr(%s,\"%s\",%ld) returned %ld\n",
247: full_fname(fname), name,
248: (long)datum_len, (long)len);
249: }
250: free(ptr);
251: return NULL;
252: }
253: }
254:
255: return ptr;
256: }
257:
258: static void checksum_xattr_data(char *sum, const char *datum, size_t datum_len, stat_x *sxp)
259: {
260: if (datum == UNREAD_DATA) {
261: /* For abbreviated compressed data, we store the file's mtime as the checksum. */
262: SIVAL(sum, 0, sxp->st.st_mtime);
263: #if SIZEOF_TIME_T > 4
264: SIVAL(sum, 4, sxp->st.st_mtime >> 32);
265: #if MAX_DIGEST_LEN > 8
266: memset(sum + 8, 0, MAX_DIGEST_LEN - 8);
267: #endif
268: #else
269: #if MAX_DIGEST_LEN > 4
270: memset(sum + 4, 0, MAX_DIGEST_LEN - 4);
271: #endif
272: #endif
273: } else {
274: sum_init(-1, checksum_seed);
275: sum_update(datum, datum_len);
276: sum_end(sum);
277: }
278: }
279:
280: $$$ERROR$$$ the old patch needs reworking since rsync_xal_get() has totally changed!
281:
282: static int rsync_xal_get(const char *fname, stat_x *sxp)
283: {
284: ssize_t list_len, name_len;
285: size_t datum_len, name_offset;
286: char *name, *ptr;
287: #ifdef HAVE_LINUX_XATTRS
288: int user_only = am_sender ? 0 : !am_root;
289: #endif
290: rsync_xa *rxa;
291: int count, flags;
292: item_list *xalp = sxp->xattr;
293:
294: /* This puts the name list into the "namebuf" buffer. */
295: if ((list_len = get_xattr_names(fname)) < 0)
296: return -1;
297:
298: for (name = namebuf; list_len > 0; name += name_len) {
299: name_len = strlen(name) + 1;
300: list_len -= name_len;
301:
302: if (saw_xattr_filter) {
303: if (name_is_excluded(name, NAME_IS_XATTR, ALL_FILTERS))
304: continue;
305: }
306: #ifdef HAVE_LINUX_XATTRS
307: /* Choose between ignoring the system namespace or (non-root) ignoring any non-user namespace. */
308: else if (user_only ? !HAS_PREFIX(name, USER_PREFIX) : HAS_PREFIX(name, SYSTEM_PREFIX))
309: continue;
310: #endif
311:
312: /* No rsync.%FOO attributes are copied w/o 2 -X options. */
313: if (name_len > RPRE_LEN && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
314: if ((am_sender && preserve_xattrs < 2)
315: || (am_root < 0
316: && (strcmp(name+RPRE_LEN+1, XSTAT_SUFFIX) == 0
317: || strcmp(name+RPRE_LEN+1, XACC_ACL_SUFFIX) == 0
318: || strcmp(name+RPRE_LEN+1, XDEF_ACL_SUFFIX) == 0
319: || strcmp(name+RPRE_LEN+1, MD4_SUFFIX) == 0
320: || strcmp(name+RPRE_LEN+1, MD5_SUFFIX) == 0)))
321: continue;
322: }
323:
324: datum_len = name_len; /* Pass extra size to get_xattr_data() */
325: flags = GXD_OMIT_COMPRESSED;
326: if (preserve_hfs_compression && sxp->st.st_flags & UF_COMPRESSED)
327: flags |= GXD_FILE_IS_COMPRESSED;
328: if (!(ptr = get_xattr_data(fname, name, &datum_len, flags)))
329: return -1;
330:
331: if (datum_len > MAX_FULL_DATUM) {
332: /* For large datums, we store a flag and a checksum. */
333: char *datum = ptr;
334: name_offset = 1 + MAX_DIGEST_LEN;
335: sum_init(-1, checksum_seed);
336: sum_update(ptr, datum_len);
337: free(ptr);
338:
339: ptr = new_array(char, name_offset + name_len);
340: *ptr = XSTATE_ABBREV;
341: checksum_xattr_data(ptr+1, datum, datum_len, sxp);
342: if (datum != UNREAD_DATA)
343: free(datum);
344: } else
345: name_offset = datum_len;
346:
347: rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
348: rxa->name = ptr + name_offset;
349: memcpy(rxa->name, name, name_len);
350: rxa->datum = ptr;
351: rxa->name_len = name_len;
352: rxa->datum_len = datum_len;
353: }
354: count = xalp->count;
355: rxa = xalp->items;
356: if (count > 1)
357: qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names);
358: for (rxa += count-1; count; count--, rxa--)
359: rxa->num = count;
360: return 0;
361: }
362:
363: /* Read the xattr(s) for this filename. */
364: int get_xattr(const char *fname, stat_x *sxp)
365: {
366: sxp->xattr = new(item_list);
367: *sxp->xattr = empty_xattr;
368:
369: if (S_ISREG(sxp->st.st_mode) || S_ISDIR(sxp->st.st_mode)) {
370: /* Everyone supports this. */
371: } else if (S_ISLNK(sxp->st.st_mode)) {
372: #ifndef NO_SYMLINK_XATTRS
373: if (!preserve_links)
374: #endif
375: return 0;
376: } else if (IS_SPECIAL(sxp->st.st_mode)) {
377: #ifndef NO_SPECIAL_XATTRS
378: if (!preserve_specials)
379: #endif
380: return 0;
381: } else if (IS_DEVICE(sxp->st.st_mode)) {
382: #ifndef NO_DEVICE_XATTRS
383: if (!preserve_devices)
384: #endif
385: return 0;
386: } else if (IS_MISSING_FILE(sxp->st))
387: return 0;
388:
389: if (rsync_xal_get(fname, sxp) < 0) {
390: free_xattr(sxp);
391: return -1;
392: }
393: return 0;
394: }
395:
396: int copy_xattrs(const char *source, const char *dest)
397: {
398: ssize_t list_len, name_len;
399: size_t datum_len;
400: char *name, *ptr;
401: #ifdef HAVE_LINUX_XATTRS
402: int user_only = am_sender ? 0 : am_root <= 0;
403: #endif
404:
405: /* This puts the name list into the "namebuf" buffer. */
406: if ((list_len = get_xattr_names(source)) < 0)
407: return -1;
408:
409: for (name = namebuf; list_len > 0; name += name_len) {
410: name_len = strlen(name) + 1;
411: list_len -= name_len;
412:
413: if (saw_xattr_filter) {
414: if (name_is_excluded(name, NAME_IS_XATTR, ALL_FILTERS))
415: continue;
416: }
417: #ifdef HAVE_LINUX_XATTRS
418: /* Choose between ignoring the system namespace or (non-root) ignoring any non-user namespace. */
419: else if (user_only ? !HAS_PREFIX(name, USER_PREFIX) : HAS_PREFIX(name, SYSTEM_PREFIX))
420: continue;
421: #endif
422:
423: datum_len = 0;
424: if (!(ptr = get_xattr_data(source, name, &datum_len, 0)))
425: return -1;
426: if (ptr == UNREAD_DATA)
427: continue; /* XXX Is this right? */
428: if (sys_lsetxattr(dest, name, ptr, datum_len) < 0) {
429: int save_errno = errno ? errno : EINVAL;
430: rsyserr(FERROR_XFER, errno,
431: "copy_xattrs: lsetxattr(%s,\"%s\") failed",
432: full_fname(dest), name);
433: errno = save_errno;
434: return -1;
435: }
436: free(ptr);
437: }
438:
439: return 0;
440: }
441:
442: static int64 xattr_lookup_hash(const item_list *xalp)
443: {
444: const rsync_xa *rxas = xalp->items;
445: size_t i;
446: int64 key = hashlittle(&xalp->count, sizeof xalp->count);
447:
448: for (i = 0; i < xalp->count; i++) {
449: key += hashlittle(rxas[i].name, rxas[i].name_len);
450: if (rxas[i].datum_len > MAX_FULL_DATUM)
451: key += hashlittle(rxas[i].datum, MAX_DIGEST_LEN);
452: else
453: key += hashlittle(rxas[i].datum, rxas[i].datum_len);
454: }
455:
456: if (key == 0) {
457: /* This is very unlikely, but we should never
458: * return 0 as hashtable_find() doesn't like it. */
459: return 1;
460: }
461:
462: return key;
463: }
464:
465: static int find_matching_xattr(const item_list *xalp)
466: {
467: const struct ht_int64_node *node;
468: const rsync_xa_list_ref *ref;
469: int64 key;
470:
471: if (rsync_xal_h == NULL)
472: return -1;
473:
474: key = xattr_lookup_hash(xalp);
475:
476: node = hashtable_find(rsync_xal_h, key, NULL);
477: if (node == NULL)
478: return -1;
479:
480: if (node->data == NULL)
481: return -1;
482:
483: for (ref = node->data; ref != NULL; ref = ref->next) {
484: const rsync_xa_list *ptr = rsync_xal_l.items;
485: const rsync_xa *rxas1;
486: const rsync_xa *rxas2 = xalp->items;
487: size_t j;
488:
489: ptr += ref->ndx;
490: rxas1 = ptr->xa_items.items;
491:
492: /* Wrong number of elements? */
493: if (ptr->xa_items.count != xalp->count)
494: continue;
495: /* any elements different? */
496: for (j = 0; j < xalp->count; j++) {
497: if (rxas1[j].name_len != rxas2[j].name_len
498: || rxas1[j].datum_len != rxas2[j].datum_len
499: || strcmp(rxas1[j].name, rxas2[j].name))
500: break;
501: if (rxas1[j].datum_len > MAX_FULL_DATUM) {
502: if (memcmp(rxas1[j].datum + 1,
503: rxas2[j].datum + 1,
504: MAX_DIGEST_LEN) != 0)
505: break;
506: } else {
507: if (memcmp(rxas1[j].datum, rxas2[j].datum,
508: rxas2[j].datum_len))
509: break;
510: }
511: }
512: /* no differences found. This is The One! */
513: if (j == xalp->count)
514: return ref->ndx;
515: }
516:
517: return -1;
518: #endif
519: }
520:
521: /* Store *xalp on the end of rsync_xal_l */
522: static int rsync_xal_store(item_list *xalp)
523: {
524: struct ht_int64_node *node;
525: int ndx = rsync_xal_l.count; /* pre-incremented count */
526: rsync_xa_list *new_list = EXPAND_ITEM_LIST(&rsync_xal_l, rsync_xa_list, RSYNC_XAL_LIST_INITIAL);
527: rsync_xa_list_ref *new_ref;
528: /* Since the following call starts a new list, we know it will hold the
529: * entire initial-count, not just enough space for one new item. */
530: *new_list = empty_xa_list;
531: (void)EXPAND_ITEM_LIST(&new_list->xa_items, rsync_xa, xalp->count);
532: memcpy(new_list->xa_items.items, xalp->items, xalp->count * sizeof (rsync_xa));
533: new_list->xa_items.count = xalp->count;
534: xalp->count = 0;
535:
536: new_list->ndx = ndx;
537: new_list->key = xattr_lookup_hash(&new_list->xa_items);
538:
539: if (rsync_xal_h == NULL)
540: rsync_xal_h = hashtable_create(512, HT_KEY64);
541: if (rsync_xal_h == NULL)
542: out_of_memory("rsync_xal_h hashtable_create()");
543:
544: new_ref = new0(rsync_xa_list_ref);
545: new_ref->ndx = ndx;
546:
547: node = hashtable_find(rsync_xal_h, new_list->key, new_ref);
548: if (node->data != (void*)new_ref) {
549: rsync_xa_list_ref *ref = node->data;
550:
551: while (ref != NULL) {
552: if (ref->next != NULL) {
553: ref = ref->next;
554: continue;
555: }
556:
557: ref->next = new_ref;
558: break;
559: }
560: }
561:
562: return ndx;
563: }
564:
565: /* Send the make_xattr()-generated xattr list for this flist entry. */
566: int send_xattr(int f, stat_x *sxp)
567: {
568: int ndx = find_matching_xattr(sxp->xattr);
569:
570: /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
571: write_varint(f, ndx + 1);
572:
573: if (ndx < 0) {
574: rsync_xa *rxa;
575: int count = sxp->xattr->count;
576: write_varint(f, count);
577: for (rxa = sxp->xattr->items; count--; rxa++) {
578: size_t name_len = rxa->name_len;
579: const char *name = rxa->name;
580: /* Strip the rsync prefix from disguised namespaces. */
581: if (name_len > RPRE_LEN
582: #ifdef HAVE_LINUX_XATTRS
583: && am_root < 0
584: #endif
585: && name[RPRE_LEN] != '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
586: name += RPRE_LEN;
587: name_len -= RPRE_LEN;
588: }
589: #ifndef HAVE_LINUX_XATTRS
590: else {
591: /* Put everything else in the user namespace. */
592: name_len += UPRE_LEN;
593: }
594: #endif
595: write_varint(f, name_len);
596: write_varint(f, rxa->datum_len);
597: #ifndef HAVE_LINUX_XATTRS
598: if (name_len > rxa->name_len) {
599: write_buf(f, USER_PREFIX, UPRE_LEN);
600: name_len -= UPRE_LEN;
601: }
602: #endif
603: write_buf(f, name, name_len);
604: if (rxa->datum_len > MAX_FULL_DATUM)
605: write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
606: else
607: write_bigbuf(f, rxa->datum, rxa->datum_len);
608: }
609: ndx = rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
610: }
611:
612: return ndx;
613: }
614:
615: /* Return a flag indicating if we need to change a file's xattrs. If
616: * "find_all" is specified, also mark any abbreviated xattrs that we
617: * need so that send_xattr_request() can tell the sender about them. */
618: int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
619: {
620: const rsync_xa_list *glst = rsync_xal_l.items;
621: const item_list *lst;
622: rsync_xa *snd_rxa, *rec_rxa;
623: int snd_cnt, rec_cnt;
624: int cmp, same, xattrs_equal = 1;
625:
626: if (sxp && XATTR_READY(*sxp)) {
627: rec_rxa = sxp->xattr->items;
628: rec_cnt = sxp->xattr->count;
629: } else {
630: rec_rxa = NULL;
631: rec_cnt = 0;
632: }
633:
634: if (F_XATTR(file) >= 0) {
635: glst += F_XATTR(file);
636: lst = &glst->xa_items;
637: } else
638: lst = &empty_xattr;
639:
640: snd_rxa = lst->items;
641: snd_cnt = lst->count;
642:
643: /* If the count of the sender's xattrs is different from our
644: * (receiver's) xattrs, the lists are not the same. */
645: if (snd_cnt != rec_cnt) {
646: if (!find_all)
647: return 1;
648: xattrs_equal = 0;
649: }
650:
651: while (snd_cnt) {
652: cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
653: if (cmp > 0)
654: same = 0;
655: else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
656: same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
657: && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
658: MAX_DIGEST_LEN) == 0;
659: /* Flag unrequested items that we need. */
660: if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
661: snd_rxa->datum[0] = XSTATE_TODO;
662: } else {
663: same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
664: && memcmp(snd_rxa->datum, rec_rxa->datum,
665: snd_rxa->datum_len) == 0;
666: }
667: if (!same) {
668: if (!find_all)
669: return 1;
670: xattrs_equal = 0;
671: }
672:
673: if (cmp <= 0) {
674: snd_rxa++;
675: snd_cnt--;
676: }
677: if (cmp >= 0) {
678: rec_rxa++;
679: rec_cnt--;
680: }
681: }
682:
683: if (rec_cnt)
684: xattrs_equal = 0;
685:
686: return !xattrs_equal;
687: }
688:
689: /* When called by the generator (with a NULL fname), this tells the sender
690: * all the abbreviated xattr values we need. When called by the sender
691: * (with a non-NULL fname), we send all the extra xattr data it needs.
692: * The generator may also call with f_out < 0 to just change all the
693: * XSTATE_ABBREV states into XSTATE_DONE. */
694: void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
695: {
696: const rsync_xa_list *glst = rsync_xal_l.items;
697: const item_list *lst;
698: int cnt, prior_req = 0;
699: rsync_xa *rxa;
700:
701: glst += F_XATTR(file);
702: lst = &glst->xa_items;
703:
704: for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) {
705: if (rxa->datum_len <= MAX_FULL_DATUM)
706: continue;
707: switch (rxa->datum[0]) {
708: case XSTATE_ABBREV:
709: /* Items left abbreviated matched the sender's checksum, so
710: * the receiver will cache the local data for future use. */
711: if (am_generator)
712: rxa->datum[0] = XSTATE_DONE;
713: continue;
714: case XSTATE_TODO:
715: assert(f_out >= 0);
716: break;
717: default:
718: continue;
719: }
720:
721: /* Flag that we handled this abbreviated item. */
722: rxa->datum[0] = XSTATE_DONE;
723:
724: write_varint(f_out, rxa->num - prior_req);
725: prior_req = rxa->num;
726:
727: if (fname) {
728: size_t len = 0;
729: char *ptr;
730:
731: /* Re-read the long datum. */
732: if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) {
733: if (errno != ENOTSUP && errno != ENOATTR)
734: rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname);
735: write_varint(f_out, 0);
736: continue;
737: }
738:
739: assert(ptr != UNREAD_DATA);
740: write_varint(f_out, len); /* length might have changed! */
741: write_bigbuf(f_out, ptr, len);
742: free(ptr);
743: }
744: }
745:
746: if (f_out >= 0)
747: write_byte(f_out, 0); /* end the list */
748: }
749:
750: /* When called by the sender, read the request from the generator and mark
751: * any needed xattrs with a flag that lets us know they need to be sent to
752: * the receiver. When called by the receiver, reads the sent data and
753: * stores it in place of its checksum. */
754: int recv_xattr_request(struct file_struct *file, int f_in)
755: {
756: const rsync_xa_list *glst = rsync_xal_l.items;
757: const item_list *lst;
758: char *old_datum, *name;
759: rsync_xa *rxa;
760: int rel_pos, cnt, num, got_xattr_data = 0;
761:
762: if (F_XATTR(file) < 0) {
763: rprintf(FERROR, "recv_xattr_request: internal data error!\n");
764: exit_cleanup(RERR_PROTOCOL);
765: }
766: glst += F_XATTR(file);
767: lst = &glst->xa_items;
768:
769: cnt = lst->count;
770: rxa = lst->items;
771: num = 0;
772: while ((rel_pos = read_varint(f_in)) != 0) {
773: num += rel_pos;
774: if (am_sender) {
775: /* The sender-related num values are only in order on the sender.
776: * We use that order here to scan forward or backward as needed. */
777: if (rel_pos < 0) {
778: while (cnt < (int)lst->count && rxa->num > num) {
779: rxa--;
780: cnt++;
781: }
782: } else {
783: while (cnt > 1 && rxa->num < num) {
784: rxa++;
785: cnt--;
786: }
787: }
788: } else {
789: int j;
790: /* The receiving side has no known num order, so we just scan
791: * forward (w/wrap) and hope that the next value is near by. */
792: for (j = lst->count; j > 1 && rxa->num != num; j--) {
793: if (--cnt)
794: rxa++;
795: else {
796: cnt = lst->count;
797: rxa = lst->items;
798: }
799: }
800: }
801: if (!cnt || rxa->num != num) {
802: rprintf(FERROR, "[%s] could not find xattr #%d for %s\n",
803: who_am_i(), num, f_name(file, NULL));
804: exit_cleanup(RERR_PROTOCOL);
805: }
806: if (!XATTR_ABBREV(*rxa) || rxa->datum[0] != XSTATE_ABBREV) {
807: rprintf(FERROR, "[%s] internal abbrev error on %s (%s, len=%ld)!\n",
808: who_am_i(), f_name(file, NULL), rxa->name, (long)rxa->datum_len);
809: exit_cleanup(RERR_PROTOCOL);
810: }
811:
812: if (am_sender) {
813: rxa->datum[0] = XSTATE_TODO;
814: continue;
815: }
816:
817: old_datum = rxa->datum;
818: rxa->datum_len = read_varint(f_in);
819:
820: if (SIZE_MAX - rxa->name_len < rxa->datum_len)
821: overflow_exit("recv_xattr_request");
822: rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
823: name = rxa->datum + rxa->datum_len;
824: memcpy(name, rxa->name, rxa->name_len);
825: rxa->name = name;
826: free(old_datum);
827: read_buf(f_in, rxa->datum, rxa->datum_len);
828: got_xattr_data = 1;
829: }
830:
831: return got_xattr_data;
832: }
833:
834: /* ------------------------------------------------------------------------- */
835:
836: /* receive and build the rsync_xattr_lists */
837: void receive_xattr(int f, struct file_struct *file)
838: {
839: static item_list temp_xattr = EMPTY_ITEM_LIST;
840: int count, num;
841: #ifdef HAVE_LINUX_XATTRS
842: int need_sort = 0;
843: #else
844: int need_sort = 1;
845: #endif
846: int ndx = read_varint(f);
847:
848: if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
849: rprintf(FERROR, "receive_xattr: xa index %d out of"
850: " range for %s\n", ndx, f_name(file, NULL));
851: exit_cleanup(RERR_STREAMIO);
852: }
853:
854: if (ndx != 0) {
855: F_XATTR(file) = ndx - 1;
856: return;
857: }
858:
859: if ((count = read_varint(f)) != 0) {
860: (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
861: temp_xattr.count = 0;
862: }
863:
864: for (num = 1; num <= count; num++) {
865: char *ptr, *name;
866: rsync_xa *rxa;
867: size_t name_len = read_varint(f);
868: size_t datum_len = read_varint(f);
869: size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
870: size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
871: if (SIZE_MAX - dget_len < extra_len || SIZE_MAX - dget_len - extra_len < name_len)
872: overflow_exit("receive_xattr");
873: ptr = new_array(char, dget_len + extra_len + name_len);
874: name = ptr + dget_len + extra_len;
875: read_buf(f, name, name_len);
876: if (name_len < 1 || name[name_len-1] != '\0') {
877: rprintf(FERROR, "Invalid xattr name received (missing trailing \\0).\n");
878: exit_cleanup(RERR_FILEIO);
879: }
880: if (dget_len == datum_len)
881: read_buf(f, ptr, dget_len);
882: else {
883: *ptr = XSTATE_ABBREV;
884: read_buf(f, ptr + 1, MAX_DIGEST_LEN);
885: }
886:
887: if (saw_xattr_filter) {
888: if (name_is_excluded(name, NAME_IS_XATTR, ALL_FILTERS)) {
889: free(ptr);
890: continue;
891: }
892: }
893: #ifdef HAVE_LINUX_XATTRS
894: /* Non-root can only save the user namespace. */
895: if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
896: if (!am_root && !saw_xattr_filter) {
897: free(ptr);
898: continue;
899: }
900: name -= RPRE_LEN;
901: name_len += RPRE_LEN;
902: memcpy(name, RSYNC_PREFIX, RPRE_LEN);
903: need_sort = 1;
904: }
905: #else
906: /* This OS only has a user namespace, so we either
907: * strip the user prefix, or we put a non-user
908: * namespace inside our rsync hierarchy. */
909: if (HAS_PREFIX(name, USER_PREFIX)) {
910: name += UPRE_LEN;
911: name_len -= UPRE_LEN;
912: } else if (am_root) {
913: name -= RPRE_LEN;
914: name_len += RPRE_LEN;
915: memcpy(name, RSYNC_PREFIX, RPRE_LEN);
916: } else {
917: free(ptr);
918: continue;
919: }
920: #endif
921: /* No rsync.%FOO attributes are copied w/o 2 -X options. */
922: if (preserve_xattrs < 2 && name_len > RPRE_LEN
923: && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
924: free(ptr);
925: continue;
926: }
927:
928: rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
929: rxa->name = name;
930: rxa->datum = ptr;
931: rxa->name_len = name_len;
932: rxa->datum_len = datum_len;
933: rxa->num = num;
934: }
935:
936: if (need_sort && count > 1)
937: qsort(temp_xattr.items, count, sizeof (rsync_xa), rsync_xal_compare_names);
938:
939: ndx = rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
940:
941: F_XATTR(file) = ndx;
942: }
943:
944: /* Turn the xattr data in stat_x into cached xattr data, setting the index
945: * values in the file struct. */
946: void cache_tmp_xattr(struct file_struct *file, stat_x *sxp)
947: {
948: int ndx;
949:
950: if (!sxp->xattr)
951: return;
952:
953: if (prior_xattr_count == (size_t)-1)
954: prior_xattr_count = rsync_xal_l.count;
955: ndx = find_matching_xattr(sxp->xattr);
956: if (ndx < 0)
957: rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
958:
959: F_XATTR(file) = ndx;
960: }
961:
962: void uncache_tmp_xattrs(void)
963: {
964: if (prior_xattr_count != (size_t)-1) {
965: rsync_xa_list *xa_list_item = rsync_xal_l.items;
966: rsync_xa_list *xa_list_start = xa_list_item + prior_xattr_count;
967: xa_list_item += rsync_xal_l.count;
968: rsync_xal_l.count = prior_xattr_count;
969: while (xa_list_item-- > xa_list_start) {
970: struct ht_int64_node *node;
971: rsync_xa_list_ref *ref;
972:
973: rsync_xal_free(&xa_list_item->xa_items);
974:
975: if (rsync_xal_h == NULL)
976: continue;
977:
978: node = hashtable_find(rsync_xal_h, xa_list_item->key, NULL);
979: if (node == NULL)
980: continue;
981:
982: if (node->data == NULL)
983: continue;
984:
985: ref = node->data;
986: if (xa_list_item->ndx == ref->ndx) {
987: /* xa_list_item is the first in the list. */
988: node->data = ref->next;
989: free(ref);
990: continue;
991: }
992:
993: while (1) {
994: rsync_xa_list_ref *next = ref->next;
995: if (next == NULL)
996: break;
997: if (xa_list_item->ndx == next->ndx) {
998: ref->next = next->next;
999: free(next);
1000: break;
1001: }
1002: ref = next;
1003: }
1004: }
1005: prior_xattr_count = (size_t)-1;
1006: }
1007: }
1008:
1009: static int rsync_xal_set(const char *fname, item_list *xalp,
1010: const char *fnamecmp, stat_x *sxp)
1011: {
1012: rsync_xa *rxas = xalp->items;
1013: ssize_t list_len;
1014: size_t i, len;
1015: char *name, *ptr, sum[MAX_DIGEST_LEN];
1016: #ifdef HAVE_LINUX_XATTRS
1017: int user_only = am_root <= 0;
1018: #endif
1019: size_t name_len;
1020: int flags, ret = 0;
1021:
1022: /* This puts the current name list into the "namebuf" buffer. */
1023: if ((list_len = get_xattr_names(fname)) < 0)
1024: return -1;
1025:
1026: for (i = 0; i < xalp->count; i++) {
1027: name = rxas[i].name;
1028:
1029: if (XATTR_ABBREV(rxas[i])) {
1030: int sum_len;
1031: /* See if the fnamecmp version is identical. */
1032: len = name_len = rxas[i].name_len;
1033: flags = GXD_OMIT_COMPRESSED | GXD_NO_MISSING_ERROR;
1034: if (preserve_hfs_compression && sxp->st.st_flags & UF_COMPRESSED)
1035: flags |= GXD_FILE_IS_COMPRESSED;
1036: if ((ptr = get_xattr_data(fnamecmp, name, &len, flags)) == NULL) {
1037: still_abbrev:
1038: if (am_generator)
1039: continue;
1040: rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
1041: rxas[i].name, full_fname(fname));
1042: ret = -1;
1043: continue;
1044: }
1045: if (ptr == UNREAD_DATA)
1046: continue; /* XXX Is this right? */
1047: if (len != rxas[i].datum_len) {
1048: free(ptr);
1049: goto still_abbrev;
1050: }
1051:
1052: sum_init(-1, checksum_seed);
1053: sum_update(ptr, len);
1054: sum_len = sum_end(sum);
1055: if (memcmp(sum, rxas[i].datum + 1, sum_len) != 0) {
1056: free(ptr);
1057: goto still_abbrev;
1058: }
1059:
1060: if (fname == fnamecmp)
1061: ; /* Value is already set when identical */
1062: else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
1063: rsyserr(FERROR_XFER, errno,
1064: "rsync_xal_set: lsetxattr(%s,\"%s\") failed",
1065: full_fname(fname), name);
1066: ret = -1;
1067: } else /* make sure caller sets mtime */
1068: sxp->st.st_mtime = (time_t)-1;
1069:
1070: if (am_generator) { /* generator items stay abbreviated */
1071: free(ptr);
1072: continue;
1073: }
1074:
1075: memcpy(ptr + len, name, name_len);
1076: free(rxas[i].datum);
1077:
1078: rxas[i].name = name = ptr + len;
1079: rxas[i].datum = ptr;
1080: continue;
1081: }
1082:
1083: if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
1084: rsyserr(FERROR_XFER, errno,
1085: "rsync_xal_set: lsetxattr(%s,\"%s\") failed",
1086: full_fname(fname), name);
1087: ret = -1;
1088: } else /* make sure caller sets mtime */
1089: sxp->st.st_mtime = (time_t)-1;
1090: }
1091:
1092: /* Remove any extraneous names. */
1093: for (name = namebuf; list_len > 0; name += name_len) {
1094: name_len = strlen(name) + 1;
1095: list_len -= name_len;
1096:
1097: if (saw_xattr_filter) {
1098: if (name_is_excluded(name, NAME_IS_XATTR, ALL_FILTERS))
1099: continue;
1100: }
1101: #ifdef HAVE_LINUX_XATTRS
1102: /* Choose between ignoring the system namespace or (non-root) ignoring any non-user namespace. */
1103: else if (user_only ? !HAS_PREFIX(name, USER_PREFIX) : HAS_PREFIX(name, SYSTEM_PREFIX))
1104: continue;
1105: #endif
1106: if (am_root < 0 && name_len > RPRE_LEN && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0)
1107: continue;
1108:
1109: for (i = 0; i < xalp->count; i++) {
1110: if (strcmp(name, rxas[i].name) == 0)
1111: break;
1112: }
1113: if (i == xalp->count) {
1114: if (sys_lremovexattr(fname, name) < 0) {
1115: rsyserr(FERROR_XFER, errno,
1116: "rsync_xal_set: lremovexattr(%s,\"%s\") failed",
1117: full_fname(fname), name);
1118: ret = -1;
1119: } else /* make sure caller sets mtime */
1120: sxp->st.st_mtime = (time_t)-1;
1121: }
1122: }
1123:
1124: #ifdef HAVE_OSX_XATTRS
1125: rsync_xal_free(xalp); /* Free this because we aren't using find_matching_xattr(). */
1126: #endif
1127:
1128: return ret;
1129: }
1130:
1131: /* Set extended attributes on indicated filename. */
1132: int set_xattr(const char *fname, const struct file_struct *file, const char *fnamecmp, stat_x *sxp)
1133: {
1134: rsync_xa_list *glst = rsync_xal_l.items;
1135: item_list *lst;
1136: int ndx;
1137:
1138: if (dry_run)
1139: return 1; /* FIXME: --dry-run needs to compute this value */
1140:
1141: if (read_only || list_only) {
1142: errno = EROFS;
1143: return -1;
1144: }
1145:
1146: #ifdef NO_SPECIAL_XATTRS
1147: if (IS_SPECIAL(sxp->st.st_mode)) {
1148: errno = ENOTSUP;
1149: return -1;
1150: }
1151: #endif
1152: #ifdef NO_DEVICE_XATTRS
1153: if (IS_DEVICE(sxp->st.st_mode)) {
1154: errno = ENOTSUP;
1155: return -1;
1156: }
1157: #endif
1158: #ifdef NO_SYMLINK_XATTRS
1159: if (S_ISLNK(sxp->st.st_mode)) {
1160: errno = ENOTSUP;
1161: return -1;
1162: }
1163: #endif
1164:
1165: ndx = F_XATTR(file);
1166: glst += ndx;
1167: lst = &glst->xa_items;
1168: return rsync_xal_set(fname, lst, fnamecmp, sxp);
1169: }
1170:
1171: #ifdef SUPPORT_ACLS
1172: char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
1173: {
1174: const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
1175: *len_p = 0; /* no extra data alloc needed from get_xattr_data() */
1176: return get_xattr_data(fname, name, len_p, GXD_NO_MISSING_ERROR);
1177: }
1178:
1179: int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
1180: {
1181: const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
1182: if (sys_lsetxattr(fname, name, buf, buf_len) < 0) {
1183: rsyserr(FERROR_XFER, errno,
1184: "set_xattr_acl: lsetxattr(%s,\"%s\") failed",
1185: full_fname(fname), name);
1186: return -1;
1187: }
1188: return 0;
1189: }
1190:
1191: int del_def_xattr_acl(const char *fname)
1192: {
1193: return sys_lremovexattr(fname, XDEF_ACL_ATTR);
1194: }
1195: #endif
1196:
1197: int get_sum_xattr(const char *fname, STRUCT_STAT *stp, char *sum)
1198: {
1199: const char *mdattr = checksum_type == 5 ? MD5_ATTR : MD4_ATTR;
1200: char buf[256];
1201: uint32 file_length, mtime;
1202: int len;
1203:
1204: len = sys_lgetxattr(fname, mdattr, buf, sizeof buf);
1205: if (len < 0) {
1206: if (errno == ENOTSUP || errno == ENOATTR)
1207: return 0;
1208: rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
1209: mdattr, full_fname(fname));
1210: return 0;
1211: }
1212: if (len != 4 + 4 + flist_csum_len) {
1213: rprintf(FERROR, "Corrupt %s xattr attached to %s -- skipping\n",
1214: mdattr, full_fname(fname));
1215: return 0;
1216: }
1217:
1218: file_length = IVAL(buf, 0); /* 32-bit values -- trunctions are OK */
1219: mtime = IVAL(buf, 4);
1220:
1221: if ((uint32)stp->st_size != file_length || (uint32)stp->st_mtime != mtime)
1222: return 0;
1223:
1224: memcpy(sum, buf + 8, flist_csum_len);
1225:
1226: return 1;
1227: }
1228:
1229: int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1230: {
1231: int mode, rdev_major, rdev_minor, uid, gid, len;
1232: char buf[256];
1233:
1234: if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
1235: return -1;
1236:
1237: if (xst)
1238: *xst = *fst;
1239: else
1240: xst = fst;
1241: if (fname) {
1242: fd = -1;
1243: len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
1244: } else {
1245: fname = "fd";
1246: len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
1247: }
1248: if (len >= (int)sizeof buf) {
1249: len = -1;
1250: errno = ERANGE;
1251: }
1252: if (len < 0) {
1253: if (errno == ENOTSUP || errno == ENOATTR)
1254: return -1;
1255: if (errno == EPERM && S_ISLNK(fst->st_mode)) {
1256: xst->st_uid = 0;
1257: xst->st_gid = 0;
1258: return 0;
1259: }
1260: rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
1261: XSTAT_ATTR, full_fname(fname));
1262: return -1;
1263: }
1264: buf[len] = '\0';
1265:
1266: if (sscanf(buf, "%o %d,%d %d:%d",
1267: &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
1268: rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n",
1269: XSTAT_ATTR, full_fname(fname), buf);
1270: exit_cleanup(RERR_FILEIO);
1271: }
1272:
1273: xst->st_mode = from_wire_mode(mode);
1274: xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
1275: xst->st_uid = uid;
1276: xst->st_gid = gid;
1277:
1278: return 0;
1279: }
1280:
1281: int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
1282: {
1283: STRUCT_STAT fst, xst;
1284: dev_t rdev;
1285: mode_t mode, fmode;
1286:
1287: if (dry_run)
1288: return 0;
1289:
1290: if (read_only || list_only) {
1291: rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s",
1292: XSTAT_ATTR, full_fname(fname));
1293: return -1;
1294: }
1295:
1296: if (x_lstat(fname, &fst, &xst) < 0) {
1297: rsyserr(FERROR_XFER, errno, "failed to re-stat %s",
1298: full_fname(fname));
1299: return -1;
1300: }
1301:
1302: fst.st_mode &= (_S_IFMT | CHMOD_BITS);
1303: fmode = new_mode & (_S_IFMT | CHMOD_BITS);
1304:
1305: if (IS_DEVICE(fmode)) {
1306: uint32 *devp = F_RDEV_P(file);
1307: rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1308: } else
1309: rdev = 0;
1310:
1311: /* Dump the special permissions and enable full owner access. */
1312: mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS)
1313: | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
1314: if (fst.st_mode != mode)
1315: do_chmod(fname, mode, ST_FLAGS(fst));
1316: if (!IS_DEVICE(fst.st_mode))
1317: fst.st_rdev = 0; /* just in case */
1318:
1319: if (mode == fmode && fst.st_rdev == rdev
1320: && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) {
1321: /* xst.st_mode will be 0 if there's no current stat xattr */
1322: if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) {
1323: rsyserr(FERROR_XFER, errno,
1324: "delete of stat xattr failed for %s",
1325: full_fname(fname));
1326: return -1;
1327: }
1328: return 0;
1329: }
1330:
1331: if (xst.st_mode != fmode || xst.st_rdev != rdev
1332: || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
1333: char buf[256];
1334: int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u",
1335: to_wire_mode(fmode),
1336: (int)major(rdev), (int)minor(rdev),
1337: F_OWNER(file), F_GROUP(file));
1338: if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) {
1339: if (errno == EPERM && S_ISLNK(fst.st_mode))
1340: return 0;
1341: rsyserr(FERROR_XFER, errno,
1342: "failed to write xattr %s for %s",
1343: XSTAT_ATTR, full_fname(fname));
1344: return -1;
1345: }
1346: }
1347:
1348: return 0;
1349: }
1350:
1351: #ifdef SUPPORT_HFS_COMPRESSION
1352: static inline void hfs_compress_tweaks(STRUCT_STAT *fst)
1353: {
1354: if (fst->st_flags & UF_COMPRESSED) {
1355: if (preserve_hfs_compression) {
1356: /* We're sending the compression xattr, not the decompressed data fork.
1357: * Setting rsync's idea of the file size to 0 effectively prevents the
1358: * transfer of the data fork. */
1359: fst->st_size = 0;
1360: } else {
1361: /* If the sender's filesystem supports compression, then we'll be able
1362: * to send the decompressed data fork and the decmpfs xattr will be
1363: * hidden (not sent). As such, we need to strip the compression flag. */
1364: fst->st_flags &= ~UF_COMPRESSED;
1365: }
1366: }
1367: }
1368: #endif
1369:
1370: int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1371: {
1372: int ret = do_stat(fname, fst);
1373: if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1374: xst->st_mode = 0;
1375: #ifdef SUPPORT_HFS_COMPRESSION
1376: hfs_compress_tweaks(fst);
1377: #endif
1378: return ret;
1379: }
1380:
1381: int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1382: {
1383: int ret = do_lstat(fname, fst);
1384: if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1385: xst->st_mode = 0;
1386: #ifdef SUPPORT_HFS_COMPRESSION
1387: hfs_compress_tweaks(fst);
1388: #endif
1389: return ret;
1390: }
1391:
1392: int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1393: {
1394: int ret = do_fstat(fd, fst);
1395: if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
1396: xst->st_mode = 0;
1397: #ifdef SUPPORT_HFS_COMPRESSION
1398: hfs_compress_tweaks(fst);
1399: #endif
1400: return ret;
1401: }
1402:
1403: #endif /* SUPPORT_XATTRS */
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