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) 2006-2013 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_links;
37: extern int preserve_devices;
38: extern int preserve_specials;
39: extern int checksum_seed;
40:
41: #define RSYNC_XAL_INITIAL 5
42: #define RSYNC_XAL_LIST_INITIAL 100
43:
44: #define MAX_FULL_DATUM 32
45:
46: #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \
47: && strncmp(str, prfx, sizeof (prfx) - 1) == 0)
48:
49: #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len)
50:
51: #define XSTATE_ABBREV 1
52: #define XSTATE_DONE 2
53: #define XSTATE_TODO 3
54:
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)
59:
60: #ifdef HAVE_LINUX_XATTRS
61: #define MIGHT_NEED_RPRE (am_root < 0)
62: #define RSYNC_PREFIX USER_PREFIX "rsync."
63: #else
64: #define MIGHT_NEED_RPRE am_root
65: #define RSYNC_PREFIX "rsync."
66: #endif
67: #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
68:
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
75:
76: typedef struct {
77: char *datum, *name;
78: size_t datum_len, name_len;
79: int num;
80: } rsync_xa;
81:
82: static size_t namebuf_len = 0;
83: static char *namebuf = NULL;
84:
85: static item_list empty_xattr = EMPTY_ITEM_LIST;
86: static item_list rsync_xal_l = EMPTY_ITEM_LIST;
87:
88: static size_t prior_xattr_count = (size_t)-1;
89:
90: /* ------------------------------------------------------------------------- */
91:
92: static void rsync_xal_free(item_list *xalp)
93: {
94: size_t i;
95: rsync_xa *rxas = xalp->items;
96:
97: if (!xalp->malloced)
98: return;
99:
100: for (i = 0; i < xalp->count; i++) {
101: free(rxas[i].datum);
102: /*free(rxas[i].name);*/
103: }
104: free(xalp->items);
105: }
106:
107: void free_xattr(stat_x *sxp)
108: {
109: if (!sxp->xattr)
110: return;
111: rsync_xal_free(sxp->xattr);
112: free(sxp->xattr);
113: sxp->xattr = NULL;
114: }
115:
116: static int rsync_xal_compare_names(const void *x1, const void *x2)
117: {
118: const rsync_xa *xa1 = x1;
119: const rsync_xa *xa2 = x2;
120: return strcmp(xa1->name, xa2->name);
121: }
122:
123: static ssize_t get_xattr_names(const char *fname)
124: {
125: ssize_t list_len;
126: int64 arg;
127:
128: if (!namebuf) {
129: namebuf_len = 1024;
130: namebuf = new_array(char, namebuf_len);
131: if (!namebuf)
132: out_of_memory("get_xattr_names");
133: }
134:
135: while (1) {
136: /* The length returned includes all the '\0' terminators. */
137: list_len = sys_llistxattr(fname, namebuf, namebuf_len);
138: if (list_len >= 0) {
139: if ((size_t)list_len <= namebuf_len)
140: break;
141: } else if (errno == ENOTSUP)
142: return 0;
143: else if (errno != ERANGE) {
144: arg = namebuf_len;
145: got_error:
146: rsyserr(FERROR_XFER, errno,
147: "get_xattr_names: llistxattr(\"%s\",%s) failed",
148: full_fname(fname), big_num(arg));
149: return -1;
150: }
151: list_len = sys_llistxattr(fname, NULL, 0);
152: if (list_len < 0) {
153: arg = 0;
154: goto got_error;
155: }
156: if (namebuf_len)
157: free(namebuf);
158: namebuf_len = list_len + 1024;
159: namebuf = new_array(char, namebuf_len);
160: if (!namebuf)
161: out_of_memory("get_xattr_names");
162: }
163:
164: return list_len;
165: }
166:
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)
172: {
173: size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
174: size_t extra_len = *len_ptr;
175: char *ptr;
176:
177: *len_ptr = datum_len;
178:
179: if (datum_len == (size_t)-1) {
180: if (errno == ENOTSUP || no_missing_error)
181: return NULL;
182: rsyserr(FERROR_XFER, errno,
183: "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed",
184: full_fname(fname), name);
185: return NULL;
186: }
187:
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");
194:
195: if (datum_len) {
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);
202: } else {
203: rprintf(FERROR_XFER,
204: "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
205: " returned %ld\n", full_fname(fname), name,
206: (long)datum_len, (long)len);
207: }
208: free(ptr);
209: return NULL;
210: }
211: }
212:
213: return ptr;
214: }
215:
216: static int rsync_xal_get(const char *fname, item_list *xalp)
217: {
218: ssize_t list_len, name_len;
219: size_t datum_len, name_offset;
220: char *name, *ptr;
221: #ifdef HAVE_LINUX_XATTRS
222: int user_only = am_sender ? 0 : !am_root;
223: #endif
224: rsync_xa *rxa;
225: int count;
226:
227: /* This puts the name list into the "namebuf" buffer. */
228: if ((list_len = get_xattr_names(fname)) < 0)
229: return -1;
230:
231: for (name = namebuf; list_len > 0; name += name_len) {
232: name_len = strlen(name) + 1;
233: list_len -= name_len;
234:
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))
240: continue;
241: #endif
242:
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)
247: || (am_root < 0
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)))
251: continue;
252: }
253:
254: datum_len = name_len; /* Pass extra size to get_xattr_data() */
255: if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
256: return -1;
257:
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);
263: free(ptr);
264:
265: if (!(ptr = new_array(char, name_offset + name_len)))
266: out_of_memory("rsync_xal_get");
267: *ptr = XSTATE_ABBREV;
268: sum_end(ptr + 1);
269: } else
270: name_offset = datum_len;
271:
272: rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
273: rxa->name = ptr + name_offset;
274: memcpy(rxa->name, name, name_len);
275: rxa->datum = ptr;
276: rxa->name_len = name_len;
277: rxa->datum_len = datum_len;
278: }
279: count = xalp->count;
280: rxa = xalp->items;
281: if (count > 1)
282: qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names);
283: for (rxa += count-1; count; count--, rxa--)
284: rxa->num = count;
285: return 0;
286: }
287:
288: /* Read the xattr(s) for this filename. */
289: int get_xattr(const char *fname, stat_x *sxp)
290: {
291: sxp->xattr = new(item_list);
292: *sxp->xattr = empty_xattr;
293:
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
298: if (!preserve_links)
299: #endif
300: return 0;
301: } else if (IS_SPECIAL(sxp->st.st_mode)) {
302: #ifndef NO_SPECIAL_XATTRS
303: if (!preserve_specials)
304: #endif
305: return 0;
306: } else if (IS_DEVICE(sxp->st.st_mode)) {
307: #ifndef NO_DEVICE_XATTRS
308: if (!preserve_devices)
309: #endif
310: return 0;
311: }
312:
313: if (rsync_xal_get(fname, sxp->xattr) < 0) {
314: free_xattr(sxp);
315: return -1;
316: }
317: return 0;
318: }
319:
320: int copy_xattrs(const char *source, const char *dest)
321: {
322: ssize_t list_len, name_len;
323: size_t datum_len;
324: char *name, *ptr;
325: #ifdef HAVE_LINUX_XATTRS
326: int user_only = am_sender ? 0 : am_root <= 0;
327: #endif
328:
329: /* This puts the name list into the "namebuf" buffer. */
330: if ((list_len = get_xattr_names(source)) < 0)
331: return -1;
332:
333: for (name = namebuf; list_len > 0; name += name_len) {
334: name_len = strlen(name) + 1;
335: list_len -= name_len;
336:
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))
342: continue;
343: #endif
344:
345: datum_len = 0;
346: if (!(ptr = get_xattr_data(source, name, &datum_len, 0)))
347: return -1;
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);
353: errno = save_errno;
354: return -1;
355: }
356: free(ptr);
357: }
358:
359: return 0;
360: }
361:
362: static int find_matching_xattr(item_list *xalp)
363: {
364: size_t i, j;
365: item_list *lst = rsync_xal_l.items;
366:
367: for (i = 0; i < rsync_xal_l.count; i++) {
368: rsync_xa *rxas1 = lst[i].items;
369: rsync_xa *rxas2 = xalp->items;
370:
371: /* Wrong number of elements? */
372: if (lst[i].count != xalp->count)
373: continue;
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))
379: break;
380: if (rxas1[j].datum_len > MAX_FULL_DATUM) {
381: if (memcmp(rxas1[j].datum + 1,
382: rxas2[j].datum + 1,
383: MAX_DIGEST_LEN) != 0)
384: break;
385: } else {
386: if (memcmp(rxas1[j].datum, rxas2[j].datum,
387: rxas2[j].datum_len))
388: break;
389: }
390: }
391: /* no differences found. This is The One! */
392: if (j == xalp->count)
393: return i;
394: }
395:
396: return -1;
397: }
398:
399: /* Store *xalp on the end of rsync_xal_l */
400: static void rsync_xal_store(item_list *xalp)
401: {
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;
409: xalp->count = 0;
410: }
411:
412: /* Send the make_xattr()-generated xattr list for this flist entry. */
413: int send_xattr(int f, stat_x *sxp)
414: {
415: int ndx = find_matching_xattr(sxp->xattr);
416:
417: /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
418: write_varint(f, ndx + 1);
419:
420: if (ndx < 0) {
421: rsync_xa *rxa;
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
430: && am_root < 0
431: #endif
432: && name[RPRE_LEN] != '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
433: name += RPRE_LEN;
434: name_len -= RPRE_LEN;
435: }
436: #ifndef HAVE_LINUX_XATTRS
437: else {
438: /* Put everything else in the user namespace. */
439: name_len += UPRE_LEN;
440: }
441: #endif
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;
448: }
449: #endif
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);
453: else
454: write_buf(f, rxa->datum, rxa->datum_len);
455: }
456: ndx = rsync_xal_l.count; /* pre-incremented count */
457: rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
458: }
459:
460: return ndx;
461: }
462:
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)
467: {
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;
472:
473: if (sxp && XATTR_READY(*sxp)) {
474: rec_rxa = sxp->xattr->items;
475: rec_cnt = sxp->xattr->count;
476: } else {
477: rec_rxa = NULL;
478: rec_cnt = 0;
479: }
480:
481: if (F_XATTR(file) >= 0)
482: lst += F_XATTR(file);
483: else
484: lst = &empty_xattr;
485:
486: snd_rxa = lst->items;
487: snd_cnt = lst->count;
488:
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) {
492: if (!find_all)
493: return 1;
494: xattrs_equal = 0;
495: }
496:
497: while (snd_cnt) {
498: cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
499: if (cmp > 0)
500: same = 0;
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;
508: } else {
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;
512: }
513: if (!same) {
514: if (!find_all)
515: return 1;
516: xattrs_equal = 0;
517: }
518:
519: if (cmp <= 0) {
520: snd_rxa++;
521: snd_cnt--;
522: }
523: if (cmp >= 0) {
524: rec_rxa++;
525: rec_cnt--;
526: }
527: }
528:
529: if (rec_cnt)
530: xattrs_equal = 0;
531:
532: return !xattrs_equal;
533: }
534:
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)
541: {
542: item_list *lst = rsync_xal_l.items;
543: int cnt, prior_req = 0;
544: rsync_xa *rxa;
545:
546: lst += F_XATTR(file);
547: for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) {
548: if (rxa->datum_len <= MAX_FULL_DATUM)
549: continue;
550: switch (rxa->datum[0]) {
551: case XSTATE_ABBREV:
552: /* Items left abbreviated matched the sender's checksum, so
553: * the receiver will cache the local data for future use. */
554: if (am_generator)
555: rxa->datum[0] = XSTATE_DONE;
556: continue;
557: case XSTATE_TODO:
558: assert(f_out >= 0);
559: break;
560: default:
561: continue;
562: }
563:
564: /* Flag that we handled this abbreviated item. */
565: rxa->datum[0] = XSTATE_DONE;
566:
567: write_varint(f_out, rxa->num - prior_req);
568: prior_req = rxa->num;
569:
570: if (fname) {
571: size_t len = 0;
572: char *ptr;
573:
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);
578: continue;
579: }
580:
581: write_varint(f_out, len); /* length might have changed! */
582: write_buf(f_out, ptr, len);
583: free(ptr);
584: }
585: }
586:
587: if (f_out >= 0)
588: write_byte(f_out, 0); /* end the list */
589: }
590:
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)
596: {
597: item_list *lst = rsync_xal_l.items;
598: char *old_datum, *name;
599: rsync_xa *rxa;
600: int rel_pos, cnt, num, got_xattr_data = 0;
601:
602: if (F_XATTR(file) < 0) {
603: rprintf(FERROR, "recv_xattr_request: internal data error!\n");
604: exit_cleanup(RERR_PROTOCOL);
605: }
606: lst += F_XATTR(file);
607:
608: cnt = lst->count;
609: rxa = lst->items;
610: num = 0;
611: while ((rel_pos = read_varint(f_in)) != 0) {
612: num += rel_pos;
613: while (cnt && rxa->num < num) {
614: rxa++;
615: cnt--;
616: }
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);
621: }
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);
626: }
627:
628: if (am_sender) {
629: rxa->datum[0] = XSTATE_TODO;
630: continue;
631: }
632:
633: old_datum = rxa->datum;
634: rxa->datum_len = read_varint(f_in);
635:
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);
639: if (!rxa->datum)
640: out_of_memory("recv_xattr_request");
641: name = rxa->datum + rxa->datum_len;
642: memcpy(name, rxa->name, rxa->name_len);
643: rxa->name = name;
644: free(old_datum);
645: read_buf(f_in, rxa->datum, rxa->datum_len);
646: got_xattr_data = 1;
647: }
648:
649: return got_xattr_data;
650: }
651:
652: /* ------------------------------------------------------------------------- */
653:
654: /* receive and build the rsync_xattr_lists */
655: void receive_xattr(int f, struct file_struct *file)
656: {
657: static item_list temp_xattr = EMPTY_ITEM_LIST;
658: int count, num;
659: #ifdef HAVE_LINUX_XATTRS
660: int need_sort = 0;
661: #else
662: int need_sort = 1;
663: #endif
664: int ndx = read_varint(f);
665:
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);
670: }
671:
672: if (ndx != 0) {
673: F_XATTR(file) = ndx - 1;
674: return;
675: }
676:
677: if ((count = read_varint(f)) != 0) {
678: (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
679: temp_xattr.count = 0;
680: }
681:
682: for (num = 1; num <= count; num++) {
683: char *ptr, *name;
684: rsync_xa *rxa;
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);
693: if (!ptr)
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);
699: else {
700: *ptr = XSTATE_ABBREV;
701: read_buf(f, ptr + 1, MAX_DIGEST_LEN);
702: }
703: #ifdef HAVE_LINUX_XATTRS
704: /* Non-root can only save the user namespace. */
705: if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
706: if (!am_root) {
707: free(ptr);
708: continue;
709: }
710: name -= RPRE_LEN;
711: name_len += RPRE_LEN;
712: memcpy(name, RSYNC_PREFIX, RPRE_LEN);
713: need_sort = 1;
714: }
715: #else
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)) {
720: name += UPRE_LEN;
721: name_len -= UPRE_LEN;
722: } else if (am_root) {
723: name -= RPRE_LEN;
724: name_len += RPRE_LEN;
725: memcpy(name, RSYNC_PREFIX, RPRE_LEN);
726: } else {
727: free(ptr);
728: continue;
729: }
730: #endif
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)) {
734: free(ptr);
735: continue;
736: }
737: rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
738: rxa->name = name;
739: rxa->datum = ptr;
740: rxa->name_len = name_len;
741: rxa->datum_len = datum_len;
742: rxa->num = num;
743: }
744:
745: if (need_sort && count > 1)
746: qsort(temp_xattr.items, count, sizeof (rsync_xa), rsync_xal_compare_names);
747:
748: ndx = rsync_xal_l.count; /* pre-incremented count */
749: rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
750:
751: F_XATTR(file) = ndx;
752: }
753:
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)
757: {
758: int ndx;
759:
760: if (!sxp->xattr)
761: return;
762:
763: if (prior_xattr_count == (size_t)-1)
764: prior_xattr_count = rsync_xal_l.count;
765: ndx = find_matching_xattr(sxp->xattr);
766: if (ndx < 0)
767: rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
768:
769: F_XATTR(file) = ndx;
770: }
771:
772: void uncache_tmp_xattrs(void)
773: {
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;
782: }
783: }
784:
785: static int rsync_xal_set(const char *fname, item_list *xalp,
786: const char *fnamecmp, stat_x *sxp)
787: {
788: rsync_xa *rxas = xalp->items;
789: ssize_t list_len;
790: size_t i, len;
791: char *name, *ptr, sum[MAX_DIGEST_LEN];
792: #ifdef HAVE_LINUX_XATTRS
793: int user_only = am_root <= 0;
794: #endif
795: size_t name_len;
796: int ret = 0;
797:
798: /* This puts the current name list into the "namebuf" buffer. */
799: if ((list_len = get_xattr_names(fname)) < 0)
800: return -1;
801:
802: for (i = 0; i < xalp->count; i++) {
803: name = rxas[i].name;
804:
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) {
809: still_abbrev:
810: if (am_generator)
811: continue;
812: rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
813: rxas[i].name, full_fname(fname));
814: ret = -1;
815: continue;
816: }
817: if (len != rxas[i].datum_len) {
818: free(ptr);
819: goto still_abbrev;
820: }
821:
822: sum_init(checksum_seed);
823: sum_update(ptr, len);
824: sum_end(sum);
825: if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
826: free(ptr);
827: goto still_abbrev;
828: }
829:
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);
836: ret = -1;
837: } else /* make sure caller sets mtime */
838: sxp->st.st_mtime = (time_t)-1;
839:
840: if (am_generator) { /* generator items stay abbreviated */
841: free(ptr);
842: continue;
843: }
844:
845: memcpy(ptr + len, name, name_len);
846: free(rxas[i].datum);
847:
848: rxas[i].name = name = ptr + len;
849: rxas[i].datum = ptr;
850: continue;
851: }
852:
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);
857: ret = -1;
858: } else /* make sure caller sets mtime */
859: sxp->st.st_mtime = (time_t)-1;
860: }
861:
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;
866:
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))
872: continue;
873: #endif
874: if (am_root < 0 && name_len > RPRE_LEN
875: && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0)
876: continue;
877:
878: for (i = 0; i < xalp->count; i++) {
879: if (strcmp(name, rxas[i].name) == 0)
880: break;
881: }
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);
887: ret = -1;
888: } else /* make sure caller sets mtime */
889: sxp->st.st_mtime = (time_t)-1;
890: }
891: }
892:
893: return ret;
894: }
895:
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)
899: {
900: int ndx;
901: item_list *lst = rsync_xal_l.items;
902:
903: if (dry_run)
904: return 1; /* FIXME: --dry-run needs to compute this value */
905:
906: if (read_only || list_only) {
907: errno = EROFS;
908: return -1;
909: }
910:
911: #ifdef NO_SPECIAL_XATTRS
912: if (IS_SPECIAL(sxp->st.st_mode)) {
913: errno = ENOTSUP;
914: return -1;
915: }
916: #endif
917: #ifdef NO_DEVICE_XATTRS
918: if (IS_DEVICE(sxp->st.st_mode)) {
919: errno = ENOTSUP;
920: return -1;
921: }
922: #endif
923: #ifdef NO_SYMLINK_XATTRS
924: if (S_ISLNK(sxp->st.st_mode)) {
925: errno = ENOTSUP;
926: return -1;
927: }
928: #endif
929:
930: ndx = F_XATTR(file);
931: return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp);
932: }
933:
934: #ifdef SUPPORT_ACLS
935: char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
936: {
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);
940: }
941:
942: int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
943: {
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);
949: return -1;
950: }
951: return 0;
952: }
953:
954: int del_def_xattr_acl(const char *fname)
955: {
956: return sys_lremovexattr(fname, XDEF_ACL_ATTR);
957: }
958: #endif
959:
960: int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
961: {
962: int mode, rdev_major, rdev_minor, uid, gid, len;
963: char buf[256];
964:
965: if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
966: return -1;
967:
968: if (xst)
969: *xst = *fst;
970: else
971: xst = fst;
972: if (fname) {
973: fd = -1;
974: len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
975: } else {
976: fname = "fd";
977: len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
978: }
979: if (len >= (int)sizeof buf) {
980: len = -1;
981: errno = ERANGE;
982: }
983: if (len < 0) {
984: if (errno == ENOTSUP || errno == ENOATTR)
985: return -1;
986: if (errno == EPERM && S_ISLNK(fst->st_mode)) {
987: xst->st_uid = 0;
988: xst->st_gid = 0;
989: return 0;
990: }
991: rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
992: XSTAT_ATTR, full_fname(fname));
993: return -1;
994: }
995: buf[len] = '\0';
996:
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);
1002: }
1003:
1004: xst->st_mode = from_wire_mode(mode);
1005: xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
1006: xst->st_uid = uid;
1007: xst->st_gid = gid;
1008:
1009: return 0;
1010: }
1011:
1012: int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
1013: {
1014: STRUCT_STAT fst, xst;
1015: dev_t rdev;
1016: mode_t mode, fmode;
1017:
1018: if (dry_run)
1019: return 0;
1020:
1021: if (read_only || list_only) {
1022: rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s",
1023: XSTAT_ATTR, full_fname(fname));
1024: return -1;
1025: }
1026:
1027: if (x_lstat(fname, &fst, &xst) < 0) {
1028: rsyserr(FERROR_XFER, errno, "failed to re-stat %s",
1029: full_fname(fname));
1030: return -1;
1031: }
1032:
1033: fst.st_mode &= (_S_IFMT | CHMOD_BITS);
1034: fmode = new_mode & (_S_IFMT | CHMOD_BITS);
1035:
1036: if (IS_DEVICE(fmode)) {
1037: uint32 *devp = F_RDEV_P(file);
1038: rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1039: } else
1040: rdev = 0;
1041:
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 */
1049:
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",
1056: full_fname(fname));
1057: return -1;
1058: }
1059: return 0;
1060: }
1061:
1062: if (xst.st_mode != fmode || xst.st_rdev != rdev
1063: || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
1064: char buf[256];
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))
1071: return 0;
1072: rsyserr(FERROR_XFER, errno,
1073: "failed to write xattr %s for %s",
1074: XSTAT_ATTR, full_fname(fname));
1075: return -1;
1076: }
1077: }
1078:
1079: return 0;
1080: }
1081:
1082: int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1083: {
1084: int ret = do_stat(fname, fst);
1085: if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1086: xst->st_mode = 0;
1087: return ret;
1088: }
1089:
1090: int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1091: {
1092: int ret = do_lstat(fname, fst);
1093: if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1094: xst->st_mode = 0;
1095: return ret;
1096: }
1097:
1098: int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1099: {
1100: int ret = do_fstat(fd, fst);
1101: if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
1102: xst->st_mode = 0;
1103: return ret;
1104: }
1105:
1106: #endif /* SUPPORT_XATTRS */
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