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) 2006-2015 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: } else if (IS_MISSING_FILE(sxp->st))
312: return 0;
313:
314: if (rsync_xal_get(fname, sxp->xattr) < 0) {
315: free_xattr(sxp);
316: return -1;
317: }
318: return 0;
319: }
320:
321: int copy_xattrs(const char *source, const char *dest)
322: {
323: ssize_t list_len, name_len;
324: size_t datum_len;
325: char *name, *ptr;
326: #ifdef HAVE_LINUX_XATTRS
327: int user_only = am_sender ? 0 : am_root <= 0;
328: #endif
329:
330: /* This puts the name list into the "namebuf" buffer. */
331: if ((list_len = get_xattr_names(source)) < 0)
332: return -1;
333:
334: for (name = namebuf; list_len > 0; name += name_len) {
335: name_len = strlen(name) + 1;
336: list_len -= name_len;
337:
338: #ifdef HAVE_LINUX_XATTRS
339: /* We always ignore the system namespace, and non-root
340: * ignores everything but the user namespace. */
341: if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
342: : HAS_PREFIX(name, SYSTEM_PREFIX))
343: continue;
344: #endif
345:
346: datum_len = 0;
347: if (!(ptr = get_xattr_data(source, name, &datum_len, 0)))
348: return -1;
349: if (sys_lsetxattr(dest, name, ptr, datum_len) < 0) {
350: int save_errno = errno ? errno : EINVAL;
351: rsyserr(FERROR_XFER, errno,
352: "copy_xattrs: lsetxattr(\"%s\",\"%s\") failed",
353: full_fname(dest), name);
354: errno = save_errno;
355: return -1;
356: }
357: free(ptr);
358: }
359:
360: return 0;
361: }
362:
363: static int find_matching_xattr(item_list *xalp)
364: {
365: size_t i, j;
366: item_list *lst = rsync_xal_l.items;
367:
368: for (i = 0; i < rsync_xal_l.count; i++) {
369: rsync_xa *rxas1 = lst[i].items;
370: rsync_xa *rxas2 = xalp->items;
371:
372: /* Wrong number of elements? */
373: if (lst[i].count != xalp->count)
374: continue;
375: /* any elements different? */
376: for (j = 0; j < xalp->count; j++) {
377: if (rxas1[j].name_len != rxas2[j].name_len
378: || rxas1[j].datum_len != rxas2[j].datum_len
379: || strcmp(rxas1[j].name, rxas2[j].name))
380: break;
381: if (rxas1[j].datum_len > MAX_FULL_DATUM) {
382: if (memcmp(rxas1[j].datum + 1,
383: rxas2[j].datum + 1,
384: MAX_DIGEST_LEN) != 0)
385: break;
386: } else {
387: if (memcmp(rxas1[j].datum, rxas2[j].datum,
388: rxas2[j].datum_len))
389: break;
390: }
391: }
392: /* no differences found. This is The One! */
393: if (j == xalp->count)
394: return i;
395: }
396:
397: return -1;
398: }
399:
400: /* Store *xalp on the end of rsync_xal_l */
401: static void rsync_xal_store(item_list *xalp)
402: {
403: item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL);
404: /* Since the following call starts a new list, we know it will hold the
405: * entire initial-count, not just enough space for one new item. */
406: *new_lst = empty_xattr;
407: (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count);
408: memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa));
409: new_lst->count = xalp->count;
410: xalp->count = 0;
411: }
412:
413: /* Send the make_xattr()-generated xattr list for this flist entry. */
414: int send_xattr(int f, stat_x *sxp)
415: {
416: int ndx = find_matching_xattr(sxp->xattr);
417:
418: /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
419: write_varint(f, ndx + 1);
420:
421: if (ndx < 0) {
422: rsync_xa *rxa;
423: int count = sxp->xattr->count;
424: write_varint(f, count);
425: for (rxa = sxp->xattr->items; count--; rxa++) {
426: size_t name_len = rxa->name_len;
427: const char *name = rxa->name;
428: /* Strip the rsync prefix from disguised namespaces. */
429: if (name_len > RPRE_LEN
430: #ifdef HAVE_LINUX_XATTRS
431: && am_root < 0
432: #endif
433: && name[RPRE_LEN] != '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
434: name += RPRE_LEN;
435: name_len -= RPRE_LEN;
436: }
437: #ifndef HAVE_LINUX_XATTRS
438: else {
439: /* Put everything else in the user namespace. */
440: name_len += UPRE_LEN;
441: }
442: #endif
443: write_varint(f, name_len);
444: write_varint(f, rxa->datum_len);
445: #ifndef HAVE_LINUX_XATTRS
446: if (name_len > rxa->name_len) {
447: write_buf(f, USER_PREFIX, UPRE_LEN);
448: name_len -= UPRE_LEN;
449: }
450: #endif
451: write_buf(f, name, name_len);
452: if (rxa->datum_len > MAX_FULL_DATUM)
453: write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
454: else
455: write_bigbuf(f, rxa->datum, rxa->datum_len);
456: }
457: ndx = rsync_xal_l.count; /* pre-incremented count */
458: rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
459: }
460:
461: return ndx;
462: }
463:
464: /* Return a flag indicating if we need to change a file's xattrs. If
465: * "find_all" is specified, also mark any abbreviated xattrs that we
466: * need so that send_xattr_request() can tell the sender about them. */
467: int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
468: {
469: item_list *lst = rsync_xal_l.items;
470: rsync_xa *snd_rxa, *rec_rxa;
471: int snd_cnt, rec_cnt;
472: int cmp, same, xattrs_equal = 1;
473:
474: if (sxp && XATTR_READY(*sxp)) {
475: rec_rxa = sxp->xattr->items;
476: rec_cnt = sxp->xattr->count;
477: } else {
478: rec_rxa = NULL;
479: rec_cnt = 0;
480: }
481:
482: if (F_XATTR(file) >= 0)
483: lst += F_XATTR(file);
484: else
485: lst = &empty_xattr;
486:
487: snd_rxa = lst->items;
488: snd_cnt = lst->count;
489:
490: /* If the count of the sender's xattrs is different from our
491: * (receiver's) xattrs, the lists are not the same. */
492: if (snd_cnt != rec_cnt) {
493: if (!find_all)
494: return 1;
495: xattrs_equal = 0;
496: }
497:
498: while (snd_cnt) {
499: cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
500: if (cmp > 0)
501: same = 0;
502: else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
503: same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
504: && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
505: MAX_DIGEST_LEN) == 0;
506: /* Flag unrequested items that we need. */
507: if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
508: snd_rxa->datum[0] = XSTATE_TODO;
509: } else {
510: same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
511: && memcmp(snd_rxa->datum, rec_rxa->datum,
512: snd_rxa->datum_len) == 0;
513: }
514: if (!same) {
515: if (!find_all)
516: return 1;
517: xattrs_equal = 0;
518: }
519:
520: if (cmp <= 0) {
521: snd_rxa++;
522: snd_cnt--;
523: }
524: if (cmp >= 0) {
525: rec_rxa++;
526: rec_cnt--;
527: }
528: }
529:
530: if (rec_cnt)
531: xattrs_equal = 0;
532:
533: return !xattrs_equal;
534: }
535:
536: /* When called by the generator (with a NULL fname), this tells the sender
537: * all the abbreviated xattr values we need. When called by the sender
538: * (with a non-NULL fname), we send all the extra xattr data it needs.
539: * The generator may also call with f_out < 0 to just change all the
540: * XSTATE_ABBREV states into XSTATE_DONE. */
541: void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
542: {
543: item_list *lst = rsync_xal_l.items;
544: int cnt, prior_req = 0;
545: rsync_xa *rxa;
546:
547: lst += F_XATTR(file);
548: for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) {
549: if (rxa->datum_len <= MAX_FULL_DATUM)
550: continue;
551: switch (rxa->datum[0]) {
552: case XSTATE_ABBREV:
553: /* Items left abbreviated matched the sender's checksum, so
554: * the receiver will cache the local data for future use. */
555: if (am_generator)
556: rxa->datum[0] = XSTATE_DONE;
557: continue;
558: case XSTATE_TODO:
559: assert(f_out >= 0);
560: break;
561: default:
562: continue;
563: }
564:
565: /* Flag that we handled this abbreviated item. */
566: rxa->datum[0] = XSTATE_DONE;
567:
568: write_varint(f_out, rxa->num - prior_req);
569: prior_req = rxa->num;
570:
571: if (fname) {
572: size_t len = 0;
573: char *ptr;
574:
575: /* Re-read the long datum. */
576: if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) {
577: rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname);
578: write_varint(f_out, 0);
579: continue;
580: }
581:
582: write_varint(f_out, len); /* length might have changed! */
583: write_bigbuf(f_out, ptr, len);
584: free(ptr);
585: }
586: }
587:
588: if (f_out >= 0)
589: write_byte(f_out, 0); /* end the list */
590: }
591:
592: /* When called by the sender, read the request from the generator and mark
593: * any needed xattrs with a flag that lets us know they need to be sent to
594: * the receiver. When called by the receiver, reads the sent data and
595: * stores it in place of its checksum. */
596: int recv_xattr_request(struct file_struct *file, int f_in)
597: {
598: item_list *lst = rsync_xal_l.items;
599: char *old_datum, *name;
600: rsync_xa *rxa;
601: int rel_pos, cnt, num, got_xattr_data = 0;
602:
603: if (F_XATTR(file) < 0) {
604: rprintf(FERROR, "recv_xattr_request: internal data error!\n");
605: exit_cleanup(RERR_PROTOCOL);
606: }
607: lst += F_XATTR(file);
608:
609: cnt = lst->count;
610: rxa = lst->items;
611: num = 0;
612: while ((rel_pos = read_varint(f_in)) != 0) {
613: num += rel_pos;
614: /* Note that the sender-related num values may not be in order on the receiver! */
615: while (cnt && (am_sender ? rxa->num < num : rxa->num != num)) {
616: rxa++;
617: cnt--;
618: }
619: if (!cnt || rxa->num != num) {
620: rprintf(FERROR, "[%s] could not find xattr #%d for %s\n",
621: who_am_i(), num, f_name(file, NULL));
622: exit_cleanup(RERR_PROTOCOL);
623: }
624: if (!XATTR_ABBREV(*rxa) || rxa->datum[0] != XSTATE_ABBREV) {
625: rprintf(FERROR, "[%s] internal abbrev error on %s (%s, len=%ld)!\n",
626: who_am_i(), f_name(file, NULL), rxa->name, (long)rxa->datum_len);
627: exit_cleanup(RERR_PROTOCOL);
628: }
629:
630: if (am_sender) {
631: rxa->datum[0] = XSTATE_TODO;
632: continue;
633: }
634:
635: old_datum = rxa->datum;
636: rxa->datum_len = read_varint(f_in);
637:
638: if (rxa->name_len + rxa->datum_len < rxa->name_len)
639: overflow_exit("recv_xattr_request");
640: rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
641: if (!rxa->datum)
642: out_of_memory("recv_xattr_request");
643: name = rxa->datum + rxa->datum_len;
644: memcpy(name, rxa->name, rxa->name_len);
645: rxa->name = name;
646: free(old_datum);
647: read_buf(f_in, rxa->datum, rxa->datum_len);
648: got_xattr_data = 1;
649: }
650:
651: return got_xattr_data;
652: }
653:
654: /* ------------------------------------------------------------------------- */
655:
656: /* receive and build the rsync_xattr_lists */
657: void receive_xattr(int f, struct file_struct *file)
658: {
659: static item_list temp_xattr = EMPTY_ITEM_LIST;
660: int count, num;
661: #ifdef HAVE_LINUX_XATTRS
662: int need_sort = 0;
663: #else
664: int need_sort = 1;
665: #endif
666: int ndx = read_varint(f);
667:
668: if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
669: rprintf(FERROR, "receive_xattr: xa index %d out of"
670: " range for %s\n", ndx, f_name(file, NULL));
671: exit_cleanup(RERR_STREAMIO);
672: }
673:
674: if (ndx != 0) {
675: F_XATTR(file) = ndx - 1;
676: return;
677: }
678:
679: if ((count = read_varint(f)) != 0) {
680: (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
681: temp_xattr.count = 0;
682: }
683:
684: for (num = 1; num <= count; num++) {
685: char *ptr, *name;
686: rsync_xa *rxa;
687: size_t name_len = read_varint(f);
688: size_t datum_len = read_varint(f);
689: size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
690: size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
691: if ((dget_len + extra_len < dget_len)
692: || (dget_len + extra_len + name_len < dget_len))
693: overflow_exit("receive_xattr");
694: ptr = new_array(char, dget_len + extra_len + name_len);
695: if (!ptr)
696: out_of_memory("receive_xattr");
697: name = ptr + dget_len + extra_len;
698: read_buf(f, name, name_len);
699: if (dget_len == datum_len)
700: read_buf(f, ptr, dget_len);
701: else {
702: *ptr = XSTATE_ABBREV;
703: read_buf(f, ptr + 1, MAX_DIGEST_LEN);
704: }
705: #ifdef HAVE_LINUX_XATTRS
706: /* Non-root can only save the user namespace. */
707: if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
708: if (!am_root) {
709: free(ptr);
710: continue;
711: }
712: name -= RPRE_LEN;
713: name_len += RPRE_LEN;
714: memcpy(name, RSYNC_PREFIX, RPRE_LEN);
715: need_sort = 1;
716: }
717: #else
718: /* This OS only has a user namespace, so we either
719: * strip the user prefix, or we put a non-user
720: * namespace inside our rsync hierarchy. */
721: if (HAS_PREFIX(name, USER_PREFIX)) {
722: name += UPRE_LEN;
723: name_len -= UPRE_LEN;
724: } else if (am_root) {
725: name -= RPRE_LEN;
726: name_len += RPRE_LEN;
727: memcpy(name, RSYNC_PREFIX, RPRE_LEN);
728: } else {
729: free(ptr);
730: continue;
731: }
732: #endif
733: /* No rsync.%FOO attributes are copied w/o 2 -X options. */
734: if (preserve_xattrs < 2 && name_len > RPRE_LEN
735: && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
736: free(ptr);
737: continue;
738: }
739: rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
740: rxa->name = name;
741: rxa->datum = ptr;
742: rxa->name_len = name_len;
743: rxa->datum_len = datum_len;
744: rxa->num = num;
745: }
746:
747: if (need_sort && count > 1)
748: qsort(temp_xattr.items, count, sizeof (rsync_xa), rsync_xal_compare_names);
749:
750: ndx = rsync_xal_l.count; /* pre-incremented count */
751: rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
752:
753: F_XATTR(file) = ndx;
754: }
755:
756: /* Turn the xattr data in stat_x into cached xattr data, setting the index
757: * values in the file struct. */
758: void cache_tmp_xattr(struct file_struct *file, stat_x *sxp)
759: {
760: int ndx;
761:
762: if (!sxp->xattr)
763: return;
764:
765: if (prior_xattr_count == (size_t)-1)
766: prior_xattr_count = rsync_xal_l.count;
767: ndx = find_matching_xattr(sxp->xattr);
768: if (ndx < 0)
769: rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
770:
771: F_XATTR(file) = ndx;
772: }
773:
774: void uncache_tmp_xattrs(void)
775: {
776: if (prior_xattr_count != (size_t)-1) {
777: item_list *xattr_item = rsync_xal_l.items;
778: item_list *xattr_start = xattr_item + prior_xattr_count;
779: xattr_item += rsync_xal_l.count;
780: rsync_xal_l.count = prior_xattr_count;
781: while (xattr_item-- > xattr_start)
782: rsync_xal_free(xattr_item);
783: prior_xattr_count = (size_t)-1;
784: }
785: }
786:
787: static int rsync_xal_set(const char *fname, item_list *xalp,
788: const char *fnamecmp, stat_x *sxp)
789: {
790: rsync_xa *rxas = xalp->items;
791: ssize_t list_len;
792: size_t i, len;
793: char *name, *ptr, sum[MAX_DIGEST_LEN];
794: #ifdef HAVE_LINUX_XATTRS
795: int user_only = am_root <= 0;
796: #endif
797: size_t name_len;
798: int ret = 0;
799:
800: /* This puts the current name list into the "namebuf" buffer. */
801: if ((list_len = get_xattr_names(fname)) < 0)
802: return -1;
803:
804: for (i = 0; i < xalp->count; i++) {
805: name = rxas[i].name;
806:
807: if (XATTR_ABBREV(rxas[i])) {
808: /* See if the fnamecmp version is identical. */
809: len = name_len = rxas[i].name_len;
810: if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
811: still_abbrev:
812: if (am_generator)
813: continue;
814: rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
815: rxas[i].name, full_fname(fname));
816: ret = -1;
817: continue;
818: }
819: if (len != rxas[i].datum_len) {
820: free(ptr);
821: goto still_abbrev;
822: }
823:
824: sum_init(checksum_seed);
825: sum_update(ptr, len);
826: sum_end(sum);
827: if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
828: free(ptr);
829: goto still_abbrev;
830: }
831:
832: if (fname == fnamecmp)
833: ; /* Value is already set when identical */
834: else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
835: rsyserr(FERROR_XFER, errno,
836: "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
837: full_fname(fname), name);
838: ret = -1;
839: } else /* make sure caller sets mtime */
840: sxp->st.st_mtime = (time_t)-1;
841:
842: if (am_generator) { /* generator items stay abbreviated */
843: free(ptr);
844: continue;
845: }
846:
847: memcpy(ptr + len, name, name_len);
848: free(rxas[i].datum);
849:
850: rxas[i].name = name = ptr + len;
851: rxas[i].datum = ptr;
852: continue;
853: }
854:
855: if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
856: rsyserr(FERROR_XFER, errno,
857: "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
858: full_fname(fname), name);
859: ret = -1;
860: } else /* make sure caller sets mtime */
861: sxp->st.st_mtime = (time_t)-1;
862: }
863:
864: /* Remove any extraneous names. */
865: for (name = namebuf; list_len > 0; name += name_len) {
866: name_len = strlen(name) + 1;
867: list_len -= name_len;
868:
869: #ifdef HAVE_LINUX_XATTRS
870: /* We always ignore the system namespace, and non-root
871: * ignores everything but the user namespace. */
872: if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
873: : HAS_PREFIX(name, SYSTEM_PREFIX))
874: continue;
875: #endif
876: if (am_root < 0 && name_len > RPRE_LEN
877: && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0)
878: continue;
879:
880: for (i = 0; i < xalp->count; i++) {
881: if (strcmp(name, rxas[i].name) == 0)
882: break;
883: }
884: if (i == xalp->count) {
885: if (sys_lremovexattr(fname, name) < 0) {
886: rsyserr(FERROR_XFER, errno,
887: "rsync_xal_set: lremovexattr(\"%s\",\"%s\") failed",
888: full_fname(fname), name);
889: ret = -1;
890: } else /* make sure caller sets mtime */
891: sxp->st.st_mtime = (time_t)-1;
892: }
893: }
894:
895: return ret;
896: }
897:
898: /* Set extended attributes on indicated filename. */
899: int set_xattr(const char *fname, const struct file_struct *file,
900: const char *fnamecmp, stat_x *sxp)
901: {
902: int ndx;
903: item_list *lst = rsync_xal_l.items;
904:
905: if (dry_run)
906: return 1; /* FIXME: --dry-run needs to compute this value */
907:
908: if (read_only || list_only) {
909: errno = EROFS;
910: return -1;
911: }
912:
913: #ifdef NO_SPECIAL_XATTRS
914: if (IS_SPECIAL(sxp->st.st_mode)) {
915: errno = ENOTSUP;
916: return -1;
917: }
918: #endif
919: #ifdef NO_DEVICE_XATTRS
920: if (IS_DEVICE(sxp->st.st_mode)) {
921: errno = ENOTSUP;
922: return -1;
923: }
924: #endif
925: #ifdef NO_SYMLINK_XATTRS
926: if (S_ISLNK(sxp->st.st_mode)) {
927: errno = ENOTSUP;
928: return -1;
929: }
930: #endif
931:
932: ndx = F_XATTR(file);
933: return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp);
934: }
935:
936: #ifdef SUPPORT_ACLS
937: char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
938: {
939: const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
940: *len_p = 0; /* no extra data alloc needed from get_xattr_data() */
941: return get_xattr_data(fname, name, len_p, 1);
942: }
943:
944: int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
945: {
946: const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
947: if (sys_lsetxattr(fname, name, buf, buf_len) < 0) {
948: rsyserr(FERROR_XFER, errno,
949: "set_xattr_acl: lsetxattr(\"%s\",\"%s\") failed",
950: full_fname(fname), name);
951: return -1;
952: }
953: return 0;
954: }
955:
956: int del_def_xattr_acl(const char *fname)
957: {
958: return sys_lremovexattr(fname, XDEF_ACL_ATTR);
959: }
960: #endif
961:
962: int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
963: {
964: int mode, rdev_major, rdev_minor, uid, gid, len;
965: char buf[256];
966:
967: if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
968: return -1;
969:
970: if (xst)
971: *xst = *fst;
972: else
973: xst = fst;
974: if (fname) {
975: fd = -1;
976: len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
977: } else {
978: fname = "fd";
979: len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
980: }
981: if (len >= (int)sizeof buf) {
982: len = -1;
983: errno = ERANGE;
984: }
985: if (len < 0) {
986: if (errno == ENOTSUP || errno == ENOATTR)
987: return -1;
988: if (errno == EPERM && S_ISLNK(fst->st_mode)) {
989: xst->st_uid = 0;
990: xst->st_gid = 0;
991: return 0;
992: }
993: rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
994: XSTAT_ATTR, full_fname(fname));
995: return -1;
996: }
997: buf[len] = '\0';
998:
999: if (sscanf(buf, "%o %d,%d %d:%d",
1000: &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
1001: rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n",
1002: XSTAT_ATTR, full_fname(fname), buf);
1003: exit_cleanup(RERR_FILEIO);
1004: }
1005:
1006: xst->st_mode = from_wire_mode(mode);
1007: xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
1008: xst->st_uid = uid;
1009: xst->st_gid = gid;
1010:
1011: return 0;
1012: }
1013:
1014: int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
1015: {
1016: STRUCT_STAT fst, xst;
1017: dev_t rdev;
1018: mode_t mode, fmode;
1019:
1020: if (dry_run)
1021: return 0;
1022:
1023: if (read_only || list_only) {
1024: rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s",
1025: XSTAT_ATTR, full_fname(fname));
1026: return -1;
1027: }
1028:
1029: if (x_lstat(fname, &fst, &xst) < 0) {
1030: rsyserr(FERROR_XFER, errno, "failed to re-stat %s",
1031: full_fname(fname));
1032: return -1;
1033: }
1034:
1035: fst.st_mode &= (_S_IFMT | CHMOD_BITS);
1036: fmode = new_mode & (_S_IFMT | CHMOD_BITS);
1037:
1038: if (IS_DEVICE(fmode)) {
1039: uint32 *devp = F_RDEV_P(file);
1040: rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1041: } else
1042: rdev = 0;
1043:
1044: /* Dump the special permissions and enable full owner access. */
1045: mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS)
1046: | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
1047: if (fst.st_mode != mode)
1048: do_chmod(fname, mode);
1049: if (!IS_DEVICE(fst.st_mode))
1050: fst.st_rdev = 0; /* just in case */
1051:
1052: if (mode == fmode && fst.st_rdev == rdev
1053: && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) {
1054: /* xst.st_mode will be 0 if there's no current stat xattr */
1055: if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) {
1056: rsyserr(FERROR_XFER, errno,
1057: "delete of stat xattr failed for %s",
1058: full_fname(fname));
1059: return -1;
1060: }
1061: return 0;
1062: }
1063:
1064: if (xst.st_mode != fmode || xst.st_rdev != rdev
1065: || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
1066: char buf[256];
1067: int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u",
1068: to_wire_mode(fmode),
1069: (int)major(rdev), (int)minor(rdev),
1070: F_OWNER(file), F_GROUP(file));
1071: if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) {
1072: if (errno == EPERM && S_ISLNK(fst.st_mode))
1073: return 0;
1074: rsyserr(FERROR_XFER, errno,
1075: "failed to write xattr %s for %s",
1076: XSTAT_ATTR, full_fname(fname));
1077: return -1;
1078: }
1079: }
1080:
1081: return 0;
1082: }
1083:
1084: int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1085: {
1086: int ret = do_stat(fname, fst);
1087: if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1088: xst->st_mode = 0;
1089: return ret;
1090: }
1091:
1092: int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1093: {
1094: int ret = do_lstat(fname, fst);
1095: if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1096: xst->st_mode = 0;
1097: return ret;
1098: }
1099:
1100: int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1101: {
1102: int ret = do_fstat(fd, fst);
1103: if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
1104: xst->st_mode = 0;
1105: return ret;
1106: }
1107:
1108: #endif /* SUPPORT_XATTRS */
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