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) 2006-2009 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 preserve_links;
36: extern int preserve_devices;
37: extern int preserve_specials;
38: extern int checksum_seed;
39:
40: #define RSYNC_XAL_INITIAL 5
41: #define RSYNC_XAL_LIST_INITIAL 100
42:
43: #define MAX_FULL_DATUM 32
44:
45: #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \
46: && strncmp(str, prfx, sizeof (prfx) - 1) == 0)
47:
48: #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len)
49:
50: #define XSTATE_ABBREV 1
51: #define XSTATE_DONE 2
52: #define XSTATE_TODO 3
53:
54: #define USER_PREFIX "user."
55: #define UPRE_LEN ((int)sizeof USER_PREFIX - 1)
56: #define SYSTEM_PREFIX "system."
57: #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1)
58:
59: #ifdef HAVE_LINUX_XATTRS
60: #define MIGHT_NEED_RPRE (am_root < 0)
61: #define RSYNC_PREFIX USER_PREFIX "rsync."
62: #else
63: #define MIGHT_NEED_RPRE am_root
64: #define RSYNC_PREFIX "rsync."
65: #endif
66: #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
67:
68: #define XSTAT_SUFFIX "stat"
69: #define XSTAT_ATTR RSYNC_PREFIX "%" XSTAT_SUFFIX
70: #define XACC_ACL_SUFFIX "aacl"
71: #define XACC_ACL_ATTR RSYNC_PREFIX "%" XACC_ACL_SUFFIX
72: #define XDEF_ACL_SUFFIX "dacl"
73: #define XDEF_ACL_ATTR RSYNC_PREFIX "%" XDEF_ACL_SUFFIX
74:
75: typedef struct {
76: char *datum, *name;
77: size_t datum_len, name_len;
78: int num;
79: } rsync_xa;
80:
81: static size_t namebuf_len = 0;
82: static char *namebuf = NULL;
83:
84: static item_list empty_xattr = EMPTY_ITEM_LIST;
85: static item_list rsync_xal_l = EMPTY_ITEM_LIST;
86:
87: static size_t prior_xattr_count = (size_t)-1;
88:
89: /* ------------------------------------------------------------------------- */
90:
91: static void rsync_xal_free(item_list *xalp)
92: {
93: size_t i;
94: rsync_xa *rxas = xalp->items;
95:
96: if (!xalp->malloced)
97: return;
98:
99: for (i = 0; i < xalp->count; i++) {
100: free(rxas[i].datum);
101: /*free(rxas[i].name);*/
102: }
103: free(xalp->items);
104: }
105:
106: void free_xattr(stat_x *sxp)
107: {
108: if (!sxp->xattr)
109: return;
110: rsync_xal_free(sxp->xattr);
111: free(sxp->xattr);
112: sxp->xattr = NULL;
113: }
114:
115: static int rsync_xal_compare_names(const void *x1, const void *x2)
116: {
117: const rsync_xa *xa1 = x1;
118: const rsync_xa *xa2 = x2;
119: return strcmp(xa1->name, xa2->name);
120: }
121:
122: static ssize_t get_xattr_names(const char *fname)
123: {
124: ssize_t list_len;
125: double arg;
126:
127: if (!namebuf) {
128: namebuf_len = 1024;
129: namebuf = new_array(char, namebuf_len);
130: if (!namebuf)
131: out_of_memory("get_xattr_names");
132: }
133:
134: while (1) {
135: /* The length returned includes all the '\0' terminators. */
136: list_len = sys_llistxattr(fname, namebuf, namebuf_len);
137: if (list_len >= 0) {
138: if ((size_t)list_len <= namebuf_len)
139: break;
140: } else if (errno == ENOTSUP)
141: return 0;
142: else if (errno != ERANGE) {
143: arg = (double)namebuf_len;
144: got_error:
145: rsyserr(FERROR_XFER, errno,
146: "get_xattr_names: llistxattr(\"%s\",%.0f) failed",
147: full_fname(fname), arg);
148: return -1;
149: }
150: list_len = sys_llistxattr(fname, NULL, 0);
151: if (list_len < 0) {
152: arg = 0;
153: goto got_error;
154: }
155: if (namebuf_len)
156: free(namebuf);
157: namebuf_len = list_len + 1024;
158: namebuf = new_array(char, namebuf_len);
159: if (!namebuf)
160: out_of_memory("get_xattr_names");
161: }
162:
163: return list_len;
164: }
165:
166: /* On entry, the *len_ptr parameter contains the size of the extra space we
167: * should allocate when we create a buffer for the data. On exit, it contains
168: * the length of the datum. */
169: static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr,
170: int no_missing_error)
171: {
172: size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
173: size_t extra_len = *len_ptr;
174: char *ptr;
175:
176: *len_ptr = datum_len;
177:
178: if (datum_len == (size_t)-1) {
179: if (errno == ENOTSUP || no_missing_error)
180: return NULL;
181: rsyserr(FERROR_XFER, errno,
182: "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed",
183: full_fname(fname), name);
184: return NULL;
185: }
186:
187: if (!datum_len && !extra_len)
188: extra_len = 1; /* request non-zero amount of memory */
189: if (datum_len + extra_len < datum_len)
190: overflow_exit("get_xattr_data");
191: if (!(ptr = new_array(char, datum_len + extra_len)))
192: out_of_memory("get_xattr_data");
193:
194: if (datum_len) {
195: size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
196: if (len != datum_len) {
197: if (len == (size_t)-1) {
198: rsyserr(FERROR_XFER, errno,
199: "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
200: " failed", full_fname(fname), name, (long)datum_len);
201: } else {
202: rprintf(FERROR_XFER,
203: "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
204: " returned %ld\n", full_fname(fname), name,
205: (long)datum_len, (long)len);
206: }
207: free(ptr);
208: return NULL;
209: }
210: }
211:
212: return ptr;
213: }
214:
215: static int rsync_xal_get(const char *fname, item_list *xalp)
216: {
217: ssize_t list_len, name_len;
218: size_t datum_len, name_offset;
219: char *name, *ptr;
220: #ifdef HAVE_LINUX_XATTRS
221: int user_only = am_sender ? 0 : am_root <= 0;
222: #endif
223: rsync_xa *rxa;
224: int count;
225:
226: /* This puts the name list into the "namebuf" buffer. */
227: if ((list_len = get_xattr_names(fname)) < 0)
228: return -1;
229:
230: for (name = namebuf; list_len > 0; name += name_len) {
231: name_len = strlen(name) + 1;
232: list_len -= name_len;
233:
234: #ifdef HAVE_LINUX_XATTRS
235: /* We always ignore the system namespace, and non-root
236: * ignores everything but the user namespace. */
237: if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
238: : HAS_PREFIX(name, SYSTEM_PREFIX))
239: continue;
240: #endif
241:
242: /* No rsync.%FOO attributes are copied w/o 2 -X options. */
243: if (name_len > RPRE_LEN && name[RPRE_LEN] == '%'
244: && HAS_PREFIX(name, RSYNC_PREFIX)) {
245: if ((am_sender && preserve_xattrs < 2)
246: || (am_root < 0
247: && (strcmp(name+RPRE_LEN+1, XSTAT_SUFFIX) == 0
248: || strcmp(name+RPRE_LEN+1, XACC_ACL_SUFFIX) == 0
249: || strcmp(name+RPRE_LEN+1, XDEF_ACL_SUFFIX) == 0)))
250: continue;
251: }
252:
253: datum_len = name_len; /* Pass extra size to get_xattr_data() */
254: if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
255: return -1;
256:
257: if (datum_len > MAX_FULL_DATUM) {
258: /* For large datums, we store a flag and a checksum. */
259: name_offset = 1 + MAX_DIGEST_LEN;
260: sum_init(checksum_seed);
261: sum_update(ptr, datum_len);
262: free(ptr);
263:
264: if (!(ptr = new_array(char, name_offset + name_len)))
265: out_of_memory("rsync_xal_get");
266: *ptr = XSTATE_ABBREV;
267: sum_end(ptr + 1);
268: } else
269: name_offset = datum_len;
270:
271: rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
272: rxa->name = ptr + name_offset;
273: memcpy(rxa->name, name, name_len);
274: rxa->datum = ptr;
275: rxa->name_len = name_len;
276: rxa->datum_len = datum_len;
277: }
278: count = xalp->count;
279: rxa = xalp->items;
280: if (count > 1)
281: qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names);
282: for (rxa += count-1; count; count--, rxa--)
283: rxa->num = count;
284: return 0;
285: }
286:
287: /* Read the xattr(s) for this filename. */
288: int get_xattr(const char *fname, stat_x *sxp)
289: {
290: sxp->xattr = new(item_list);
291: *sxp->xattr = empty_xattr;
292:
293: if (S_ISREG(sxp->st.st_mode) || S_ISDIR(sxp->st.st_mode)) {
294: /* Everyone supports this. */
295: } else if (S_ISLNK(sxp->st.st_mode)) {
296: #ifndef NO_SYMLINK_XATTRS
297: if (!preserve_links)
298: #endif
299: return 0;
300: } else if (IS_SPECIAL(sxp->st.st_mode)) {
301: #ifndef NO_SPECIAL_XATTRS
302: if (!preserve_specials)
303: #endif
304: return 0;
305: } else if (IS_DEVICE(sxp->st.st_mode)) {
306: #ifndef NO_DEVICE_XATTRS
307: if (!preserve_devices)
308: #endif
309: return 0;
310: }
311:
312: if (rsync_xal_get(fname, sxp->xattr) < 0) {
313: free_xattr(sxp);
314: return -1;
315: }
316: return 0;
317: }
318:
319: int copy_xattrs(const char *source, const char *dest)
320: {
321: ssize_t list_len, name_len;
322: size_t datum_len;
323: char *name, *ptr;
324: #ifdef HAVE_LINUX_XATTRS
325: int user_only = am_root <= 0;
326: #endif
327:
328: /* This puts the name list into the "namebuf" buffer. */
329: if ((list_len = get_xattr_names(source)) < 0)
330: return -1;
331:
332: for (name = namebuf; list_len > 0; name += name_len) {
333: name_len = strlen(name) + 1;
334: list_len -= name_len;
335:
336: #ifdef HAVE_LINUX_XATTRS
337: /* We always ignore the system namespace, and non-root
338: * ignores everything but the user namespace. */
339: if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
340: : HAS_PREFIX(name, SYSTEM_PREFIX))
341: continue;
342: #endif
343:
344: datum_len = 0;
345: if (!(ptr = get_xattr_data(source, name, &datum_len, 0)))
346: return -1;
347: if (sys_lsetxattr(dest, name, ptr, datum_len) < 0) {
348: int save_errno = errno ? errno : EINVAL;
349: rsyserr(FERROR_XFER, errno,
350: "copy_xattrs: lsetxattr(\"%s\",\"%s\") failed",
351: full_fname(dest), name);
352: errno = save_errno;
353: return -1;
354: }
355: free(ptr);
356: }
357:
358: return 0;
359: }
360:
361: static int find_matching_xattr(item_list *xalp)
362: {
363: size_t i, j;
364: item_list *lst = rsync_xal_l.items;
365:
366: for (i = 0; i < rsync_xal_l.count; i++) {
367: rsync_xa *rxas1 = lst[i].items;
368: rsync_xa *rxas2 = xalp->items;
369:
370: /* Wrong number of elements? */
371: if (lst[i].count != xalp->count)
372: continue;
373: /* any elements different? */
374: for (j = 0; j < xalp->count; j++) {
375: if (rxas1[j].name_len != rxas2[j].name_len
376: || rxas1[j].datum_len != rxas2[j].datum_len
377: || strcmp(rxas1[j].name, rxas2[j].name))
378: break;
379: if (rxas1[j].datum_len > MAX_FULL_DATUM) {
380: if (memcmp(rxas1[j].datum + 1,
381: rxas2[j].datum + 1,
382: MAX_DIGEST_LEN) != 0)
383: break;
384: } else {
385: if (memcmp(rxas1[j].datum, rxas2[j].datum,
386: rxas2[j].datum_len))
387: break;
388: }
389: }
390: /* no differences found. This is The One! */
391: if (j == xalp->count)
392: return i;
393: }
394:
395: return -1;
396: }
397:
398: /* Store *xalp on the end of rsync_xal_l */
399: static void rsync_xal_store(item_list *xalp)
400: {
401: item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL);
402: /* Since the following call starts a new list, we know it will hold the
403: * entire initial-count, not just enough space for one new item. */
404: *new_lst = empty_xattr;
405: (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count);
406: memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa));
407: new_lst->count = xalp->count;
408: xalp->count = 0;
409: }
410:
411: /* Send the make_xattr()-generated xattr list for this flist entry. */
412: int send_xattr(int f, stat_x *sxp)
413: {
414: int ndx = find_matching_xattr(sxp->xattr);
415:
416: /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
417: write_varint(f, ndx + 1);
418:
419: if (ndx < 0) {
420: rsync_xa *rxa;
421: int count = sxp->xattr->count;
422: write_varint(f, count);
423: for (rxa = sxp->xattr->items; count--; rxa++) {
424: size_t name_len = rxa->name_len;
425: const char *name = rxa->name;
426: /* Strip the rsync prefix from disguised namespaces. */
427: if (name_len > RPRE_LEN
428: #ifdef HAVE_LINUX_XATTRS
429: && am_root < 0
430: #endif
431: && name[RPRE_LEN] != '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
432: name += RPRE_LEN;
433: name_len -= RPRE_LEN;
434: }
435: #ifndef HAVE_LINUX_XATTRS
436: else {
437: /* Put everything else in the user namespace. */
438: name_len += UPRE_LEN;
439: }
440: #endif
441: write_varint(f, name_len);
442: write_varint(f, rxa->datum_len);
443: #ifndef HAVE_LINUX_XATTRS
444: if (name_len > rxa->name_len) {
445: write_buf(f, USER_PREFIX, UPRE_LEN);
446: name_len -= UPRE_LEN;
447: }
448: #endif
449: write_buf(f, name, name_len);
450: if (rxa->datum_len > MAX_FULL_DATUM)
451: write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
452: else
453: write_buf(f, rxa->datum, rxa->datum_len);
454: }
455: ndx = rsync_xal_l.count; /* pre-incremented count */
456: rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
457: }
458:
459: return ndx;
460: }
461:
462: /* Return a flag indicating if we need to change a file's xattrs. If
463: * "find_all" is specified, also mark any abbreviated xattrs that we
464: * need so that send_xattr_request() can tell the sender about them. */
465: int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
466: {
467: item_list *lst = rsync_xal_l.items;
468: rsync_xa *snd_rxa, *rec_rxa;
469: int snd_cnt, rec_cnt;
470: int cmp, same, xattrs_equal = 1;
471:
472: if (sxp && XATTR_READY(*sxp)) {
473: rec_rxa = sxp->xattr->items;
474: rec_cnt = sxp->xattr->count;
475: } else {
476: rec_rxa = NULL;
477: rec_cnt = 0;
478: }
479:
480: if (F_XATTR(file) >= 0)
481: lst += F_XATTR(file);
482: else
483: lst = &empty_xattr;
484:
485: snd_rxa = lst->items;
486: snd_cnt = lst->count;
487:
488: /* If the count of the sender's xattrs is different from our
489: * (receiver's) xattrs, the lists are not the same. */
490: if (snd_cnt != rec_cnt) {
491: if (!find_all)
492: return 1;
493: xattrs_equal = 0;
494: }
495:
496: while (snd_cnt) {
497: cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
498: if (cmp > 0)
499: same = 0;
500: else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
501: same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
502: && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
503: MAX_DIGEST_LEN) == 0;
504: /* Flag unrequested items that we need. */
505: if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
506: snd_rxa->datum[0] = XSTATE_TODO;
507: } else {
508: same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
509: && memcmp(snd_rxa->datum, rec_rxa->datum,
510: snd_rxa->datum_len) == 0;
511: }
512: if (!same) {
513: if (!find_all)
514: return 1;
515: xattrs_equal = 0;
516: }
517:
518: if (cmp <= 0) {
519: snd_rxa++;
520: snd_cnt--;
521: }
522: if (cmp >= 0) {
523: rec_rxa++;
524: rec_cnt--;
525: }
526: }
527:
528: if (rec_cnt)
529: xattrs_equal = 0;
530:
531: return !xattrs_equal;
532: }
533:
534: /* When called by the generator (with a NULL fname), this tells the sender
535: * all the abbreviated xattr values we need. When called by the sender
536: * (with a non-NULL fname), we send all the extra xattr data it needs.
537: * The generator may also call with f_out < 0 to just change all the
538: * XSTATE_ABBREV states into XSTATE_DONE. */
539: void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
540: {
541: item_list *lst = rsync_xal_l.items;
542: int cnt, prior_req = 0;
543: rsync_xa *rxa;
544:
545: lst += F_XATTR(file);
546: for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) {
547: if (rxa->datum_len <= MAX_FULL_DATUM)
548: continue;
549: switch (rxa->datum[0]) {
550: case XSTATE_ABBREV:
551: /* Items left abbreviated matched the sender's checksum, so
552: * the receiver will cache the local data for future use. */
553: if (am_generator)
554: rxa->datum[0] = XSTATE_DONE;
555: continue;
556: case XSTATE_TODO:
557: assert(f_out >= 0);
558: break;
559: default:
560: continue;
561: }
562:
563: /* Flag that we handled this abbreviated item. */
564: rxa->datum[0] = XSTATE_DONE;
565:
566: write_varint(f_out, rxa->num - prior_req);
567: prior_req = rxa->num;
568:
569: if (fname) {
570: size_t len = 0;
571: char *ptr;
572:
573: /* Re-read the long datum. */
574: if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) {
575: rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname);
576: write_varint(f_out, 0);
577: continue;
578: }
579:
580: write_varint(f_out, len); /* length might have changed! */
581: write_buf(f_out, ptr, len);
582: free(ptr);
583: }
584: }
585:
586: if (f_out >= 0)
587: write_byte(f_out, 0); /* end the list */
588: }
589:
590: /* When called by the sender, read the request from the generator and mark
591: * any needed xattrs with a flag that lets us know they need to be sent to
592: * the receiver. When called by the receiver, reads the sent data and
593: * stores it in place of its checksum. */
594: int recv_xattr_request(struct file_struct *file, int f_in)
595: {
596: item_list *lst = rsync_xal_l.items;
597: char *old_datum, *name;
598: rsync_xa *rxa;
599: int rel_pos, cnt, num, got_xattr_data = 0;
600:
601: if (F_XATTR(file) < 0) {
602: rprintf(FERROR, "recv_xattr_request: internal data error!\n");
603: exit_cleanup(RERR_PROTOCOL);
604: }
605: lst += F_XATTR(file);
606:
607: cnt = lst->count;
608: rxa = lst->items;
609: num = 0;
610: while ((rel_pos = read_varint(f_in)) != 0) {
611: num += rel_pos;
612: while (cnt && rxa->num < num) {
613: rxa++;
614: cnt--;
615: }
616: if (!cnt || rxa->num != num) {
617: rprintf(FERROR, "[%s] could not find xattr #%d for %s\n",
618: who_am_i(), num, f_name(file, NULL));
619: exit_cleanup(RERR_PROTOCOL);
620: }
621: if (!XATTR_ABBREV(*rxa) || rxa->datum[0] != XSTATE_ABBREV) {
622: rprintf(FERROR, "[%s] internal abbrev error on %s (%s, len=%ld)!\n",
623: who_am_i(), f_name(file, NULL), rxa->name, (long)rxa->datum_len);
624: exit_cleanup(RERR_PROTOCOL);
625: }
626:
627: if (am_sender) {
628: rxa->datum[0] = XSTATE_TODO;
629: continue;
630: }
631:
632: old_datum = rxa->datum;
633: rxa->datum_len = read_varint(f_in);
634:
635: if (rxa->name_len + rxa->datum_len < rxa->name_len)
636: overflow_exit("recv_xattr_request");
637: rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
638: if (!rxa->datum)
639: out_of_memory("recv_xattr_request");
640: name = rxa->datum + rxa->datum_len;
641: memcpy(name, rxa->name, rxa->name_len);
642: rxa->name = name;
643: free(old_datum);
644: read_buf(f_in, rxa->datum, rxa->datum_len);
645: got_xattr_data = 1;
646: }
647:
648: return got_xattr_data;
649: }
650:
651: /* ------------------------------------------------------------------------- */
652:
653: /* receive and build the rsync_xattr_lists */
654: void receive_xattr(int f, struct file_struct *file)
655: {
656: static item_list temp_xattr = EMPTY_ITEM_LIST;
657: int count, num;
658: #ifdef HAVE_LINUX_XATTRS
659: int need_sort = 0;
660: #else
661: int need_sort = 1;
662: #endif
663: int ndx = read_varint(f);
664:
665: if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
666: rprintf(FERROR, "receive_xattr: xa index %d out of"
667: " range for %s\n", ndx, f_name(file, NULL));
668: exit_cleanup(RERR_PROTOCOL);
669: }
670:
671: if (ndx != 0) {
672: F_XATTR(file) = ndx - 1;
673: return;
674: }
675:
676: if ((count = read_varint(f)) != 0) {
677: (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
678: temp_xattr.count = 0;
679: }
680:
681: for (num = 1; num <= count; num++) {
682: char *ptr, *name;
683: rsync_xa *rxa;
684: size_t name_len = read_varint(f);
685: size_t datum_len = read_varint(f);
686: size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
687: size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
688: if ((dget_len + extra_len < dget_len)
689: || (dget_len + extra_len + name_len < dget_len))
690: overflow_exit("receive_xattr");
691: ptr = new_array(char, dget_len + extra_len + name_len);
692: if (!ptr)
693: out_of_memory("receive_xattr");
694: name = ptr + dget_len + extra_len;
695: read_buf(f, name, name_len);
696: if (dget_len == datum_len)
697: read_buf(f, ptr, dget_len);
698: else {
699: *ptr = XSTATE_ABBREV;
700: read_buf(f, ptr + 1, MAX_DIGEST_LEN);
701: }
702: #ifdef HAVE_LINUX_XATTRS
703: /* Non-root can only save the user namespace. */
704: if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
705: if (!am_root) {
706: free(ptr);
707: continue;
708: }
709: name -= RPRE_LEN;
710: name_len += RPRE_LEN;
711: memcpy(name, RSYNC_PREFIX, RPRE_LEN);
712: need_sort = 1;
713: }
714: #else
715: /* This OS only has a user namespace, so we either
716: * strip the user prefix, or we put a non-user
717: * namespace inside our rsync hierarchy. */
718: if (HAS_PREFIX(name, USER_PREFIX)) {
719: name += UPRE_LEN;
720: name_len -= UPRE_LEN;
721: } else if (am_root) {
722: name -= RPRE_LEN;
723: name_len += RPRE_LEN;
724: memcpy(name, RSYNC_PREFIX, RPRE_LEN);
725: } else {
726: free(ptr);
727: continue;
728: }
729: #endif
730: /* No rsync.%FOO attributes are copied w/o 2 -X options. */
731: if (preserve_xattrs < 2 && name_len > RPRE_LEN
732: && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
733: free(ptr);
734: continue;
735: }
736: rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
737: rxa->name = name;
738: rxa->datum = ptr;
739: rxa->name_len = name_len;
740: rxa->datum_len = datum_len;
741: rxa->num = num;
742: }
743:
744: if (need_sort && count > 1)
745: qsort(temp_xattr.items, count, sizeof (rsync_xa), rsync_xal_compare_names);
746:
747: ndx = rsync_xal_l.count; /* pre-incremented count */
748: rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
749:
750: F_XATTR(file) = ndx;
751: }
752:
753: /* Turn the xattr data in stat_x into cached xattr data, setting the index
754: * values in the file struct. */
755: void cache_tmp_xattr(struct file_struct *file, stat_x *sxp)
756: {
757: int ndx;
758:
759: if (!sxp->xattr)
760: return;
761:
762: if (prior_xattr_count == (size_t)-1)
763: prior_xattr_count = rsync_xal_l.count;
764: ndx = find_matching_xattr(sxp->xattr);
765: if (ndx < 0)
766: rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
767:
768: F_XATTR(file) = ndx;
769: }
770:
771: void uncache_tmp_xattrs(void)
772: {
773: if (prior_xattr_count != (size_t)-1) {
774: item_list *xattr_item = rsync_xal_l.items;
775: item_list *xattr_start = xattr_item + prior_xattr_count;
776: xattr_item += rsync_xal_l.count;
777: rsync_xal_l.count = prior_xattr_count;
778: while (xattr_item-- > xattr_start)
779: rsync_xal_free(xattr_item);
780: prior_xattr_count = (size_t)-1;
781: }
782: }
783:
784: static int rsync_xal_set(const char *fname, item_list *xalp,
785: const char *fnamecmp, stat_x *sxp)
786: {
787: rsync_xa *rxas = xalp->items;
788: ssize_t list_len;
789: size_t i, len;
790: char *name, *ptr, sum[MAX_DIGEST_LEN];
791: #ifdef HAVE_LINUX_XATTRS
792: int user_only = am_root <= 0;
793: #endif
794: size_t name_len;
795: int ret = 0;
796:
797: /* This puts the current name list into the "namebuf" buffer. */
798: if ((list_len = get_xattr_names(fname)) < 0)
799: return -1;
800:
801: for (i = 0; i < xalp->count; i++) {
802: name = rxas[i].name;
803:
804: if (XATTR_ABBREV(rxas[i])) {
805: /* See if the fnamecmp version is identical. */
806: len = name_len = rxas[i].name_len;
807: if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
808: still_abbrev:
809: if (am_generator)
810: continue;
811: rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
812: rxas[i].name, full_fname(fname));
813: ret = -1;
814: continue;
815: }
816: if (len != rxas[i].datum_len) {
817: free(ptr);
818: goto still_abbrev;
819: }
820:
821: sum_init(checksum_seed);
822: sum_update(ptr, len);
823: sum_end(sum);
824: if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
825: free(ptr);
826: goto still_abbrev;
827: }
828:
829: if (fname == fnamecmp)
830: ; /* Value is already set when identical */
831: else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
832: rsyserr(FERROR_XFER, errno,
833: "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
834: full_fname(fname), name);
835: ret = -1;
836: } else /* make sure caller sets mtime */
837: sxp->st.st_mtime = (time_t)-1;
838:
839: if (am_generator) { /* generator items stay abbreviated */
840: free(ptr);
841: continue;
842: }
843:
844: memcpy(ptr + len, name, name_len);
845: free(rxas[i].datum);
846:
847: rxas[i].name = name = ptr + len;
848: rxas[i].datum = ptr;
849: continue;
850: }
851:
852: if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
853: rsyserr(FERROR_XFER, errno,
854: "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
855: full_fname(fname), name);
856: ret = -1;
857: } else /* make sure caller sets mtime */
858: sxp->st.st_mtime = (time_t)-1;
859: }
860:
861: /* Remove any extraneous names. */
862: for (name = namebuf; list_len > 0; name += name_len) {
863: name_len = strlen(name) + 1;
864: list_len -= name_len;
865:
866: #ifdef HAVE_LINUX_XATTRS
867: /* We always ignore the system namespace, and non-root
868: * ignores everything but the user namespace. */
869: if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
870: : HAS_PREFIX(name, SYSTEM_PREFIX))
871: continue;
872: #endif
873: if (am_root < 0 && name_len > RPRE_LEN
874: && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0)
875: continue;
876:
877: for (i = 0; i < xalp->count; i++) {
878: if (strcmp(name, rxas[i].name) == 0)
879: break;
880: }
881: if (i == xalp->count) {
882: if (sys_lremovexattr(fname, name) < 0) {
883: rsyserr(FERROR_XFER, errno,
884: "rsync_xal_set: lremovexattr(\"%s\",\"%s\") failed",
885: full_fname(fname), name);
886: ret = -1;
887: } else /* make sure caller sets mtime */
888: sxp->st.st_mtime = (time_t)-1;
889: }
890: }
891:
892: return ret;
893: }
894:
895: /* Set extended attributes on indicated filename. */
896: int set_xattr(const char *fname, const struct file_struct *file,
897: const char *fnamecmp, stat_x *sxp)
898: {
899: int ndx;
900: item_list *lst = rsync_xal_l.items;
901:
902: if (dry_run)
903: return 1; /* FIXME: --dry-run needs to compute this value */
904:
905: if (read_only || list_only) {
906: errno = EROFS;
907: return -1;
908: }
909:
910: #ifdef NO_SPECIAL_XATTRS
911: if (IS_SPECIAL(sxp->st.st_mode)) {
912: errno = ENOTSUP;
913: return -1;
914: }
915: #endif
916: #ifdef NO_DEVICE_XATTRS
917: if (IS_DEVICE(sxp->st.st_mode)) {
918: errno = ENOTSUP;
919: return -1;
920: }
921: #endif
922: #ifdef NO_SYMLINK_XATTRS
923: if (S_ISLNK(sxp->st.st_mode)) {
924: errno = ENOTSUP;
925: return -1;
926: }
927: #endif
928:
929: ndx = F_XATTR(file);
930: return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp);
931: }
932:
933: #ifdef SUPPORT_ACLS
934: char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
935: {
936: const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
937: *len_p = 0; /* no extra data alloc needed from get_xattr_data() */
938: return get_xattr_data(fname, name, len_p, 1);
939: }
940:
941: int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
942: {
943: const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
944: if (sys_lsetxattr(fname, name, buf, buf_len) < 0) {
945: rsyserr(FERROR_XFER, errno,
946: "set_xattr_acl: lsetxattr(\"%s\",\"%s\") failed",
947: full_fname(fname), name);
948: return -1;
949: }
950: return 0;
951: }
952:
953: int del_def_xattr_acl(const char *fname)
954: {
955: return sys_lremovexattr(fname, XDEF_ACL_ATTR);
956: }
957: #endif
958:
959: int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
960: {
961: int mode, rdev_major, rdev_minor, uid, gid, len;
962: char buf[256];
963:
964: if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
965: return -1;
966:
967: if (xst)
968: *xst = *fst;
969: else
970: xst = fst;
971: if (fname) {
972: fd = -1;
973: len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
974: } else {
975: fname = "fd";
976: len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
977: }
978: if (len >= (int)sizeof buf) {
979: len = -1;
980: errno = ERANGE;
981: }
982: if (len < 0) {
983: if (errno == ENOTSUP || errno == ENOATTR)
984: return -1;
985: if (errno == EPERM && S_ISLNK(fst->st_mode)) {
986: xst->st_uid = 0;
987: xst->st_gid = 0;
988: return 0;
989: }
990: rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
991: XSTAT_ATTR, full_fname(fname));
992: return -1;
993: }
994: buf[len] = '\0';
995:
996: if (sscanf(buf, "%o %d,%d %d:%d",
997: &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
998: rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n",
999: XSTAT_ATTR, full_fname(fname), buf);
1000: exit_cleanup(RERR_FILEIO);
1001: }
1002:
1003: xst->st_mode = from_wire_mode(mode);
1004: xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
1005: xst->st_uid = uid;
1006: xst->st_gid = gid;
1007:
1008: return 0;
1009: }
1010:
1011: int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
1012: {
1013: STRUCT_STAT fst, xst;
1014: dev_t rdev;
1015: mode_t mode, fmode;
1016:
1017: if (dry_run)
1018: return 0;
1019:
1020: if (read_only || list_only) {
1021: rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s",
1022: XSTAT_ATTR, full_fname(fname));
1023: return -1;
1024: }
1025:
1026: if (x_lstat(fname, &fst, &xst) < 0) {
1027: rsyserr(FERROR_XFER, errno, "failed to re-stat %s",
1028: full_fname(fname));
1029: return -1;
1030: }
1031:
1032: fst.st_mode &= (_S_IFMT | CHMOD_BITS);
1033: fmode = new_mode & (_S_IFMT | CHMOD_BITS);
1034:
1035: if (IS_DEVICE(fmode)) {
1036: uint32 *devp = F_RDEV_P(file);
1037: rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1038: } else
1039: rdev = 0;
1040:
1041: /* Dump the special permissions and enable full owner access. */
1042: mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS)
1043: | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
1044: if (fst.st_mode != mode)
1045: do_chmod(fname, mode);
1046: if (!IS_DEVICE(fst.st_mode))
1047: fst.st_rdev = 0; /* just in case */
1048:
1049: if (mode == fmode && fst.st_rdev == rdev
1050: && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) {
1051: /* xst.st_mode will be 0 if there's no current stat xattr */
1052: if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) {
1053: rsyserr(FERROR_XFER, errno,
1054: "delete of stat xattr failed for %s",
1055: full_fname(fname));
1056: return -1;
1057: }
1058: return 0;
1059: }
1060:
1061: if (xst.st_mode != fmode || xst.st_rdev != rdev
1062: || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
1063: char buf[256];
1064: int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u",
1065: to_wire_mode(fmode),
1066: (int)major(rdev), (int)minor(rdev),
1067: F_OWNER(file), F_GROUP(file));
1068: if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) {
1069: if (errno == EPERM && S_ISLNK(fst.st_mode))
1070: return 0;
1071: rsyserr(FERROR_XFER, errno,
1072: "failed to write xattr %s for %s",
1073: XSTAT_ATTR, full_fname(fname));
1074: return -1;
1075: }
1076: }
1077:
1078: return 0;
1079: }
1080:
1081: int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1082: {
1083: int ret = do_stat(fname, fst);
1084: if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1085: xst->st_mode = 0;
1086: return ret;
1087: }
1088:
1089: int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1090: {
1091: int ret = do_lstat(fname, fst);
1092: if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1093: xst->st_mode = 0;
1094: return ret;
1095: }
1096:
1097: int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1098: {
1099: int ret = do_fstat(fd, fst);
1100: if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
1101: xst->st_mode = 0;
1102: return ret;
1103: }
1104:
1105: #endif /* SUPPORT_XATTRS */
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