Commit | Line | Data |
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16edf865 WD |
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, 2007 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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
20 | */ | |
21 | ||
22 | #include "rsync.h" | |
23 | #include "lib/sysxattrs.h" | |
24 | ||
25 | #ifdef SUPPORT_XATTRS | |
26 | ||
27 | extern int dry_run; | |
28 | extern int am_root; | |
29 | extern int am_sender; | |
30 | extern int am_generator; | |
31 | extern int read_only; | |
32 | extern int list_only; | |
33 | extern int checksum_seed; | |
34 | ||
35 | #define RSYNC_XAL_INITIAL 5 | |
36 | #define RSYNC_XAL_LIST_INITIAL 100 | |
37 | ||
38 | #define MAX_FULL_DATUM 32 | |
39 | ||
40 | #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \ | |
41 | && strncmp(str, prfx, sizeof (prfx) - 1) == 0) | |
42 | ||
43 | #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len) | |
44 | ||
45 | #define XSTATE_ABBREV 0 | |
46 | #define XSTATE_DONE 1 | |
47 | #define XSTATE_TODO 2 | |
48 | #define XSTATE_LOCAL 3 | |
49 | ||
50 | #define USER_PREFIX "user." | |
51 | #define UPRE_LEN ((int)sizeof USER_PREFIX - 1) | |
52 | #define SYSTEM_PREFIX "system." | |
53 | #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1) | |
54 | ||
55 | #ifdef HAVE_LINUX_XATTRS | |
9439c0cb WD |
56 | #define MIGHT_NEED_RPRE (am_root < 0) |
57 | #define RSYNC_PREFIX USER_PREFIX "rsync." | |
16edf865 | 58 | #else |
9439c0cb | 59 | #define MIGHT_NEED_RPRE am_root |
16edf865 | 60 | #define RSYNC_PREFIX "rsync." |
16edf865 | 61 | #endif |
9439c0cb WD |
62 | #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1) |
63 | ||
64 | #define XSTAT_ATTR RSYNC_PREFIX "%stat" | |
65 | #define XSTAT_LEN ((int)sizeof XSTAT_ATTR - 1) | |
16edf865 WD |
66 | |
67 | typedef struct { | |
68 | char *datum, *name; | |
69 | size_t datum_len, name_len; | |
70 | } rsync_xa; | |
71 | ||
72 | static size_t namebuf_len = 0; | |
73 | static char *namebuf = NULL; | |
74 | ||
75 | static item_list empty_xattr = EMPTY_ITEM_LIST; | |
76 | static item_list rsync_xal_l = EMPTY_ITEM_LIST; | |
77 | ||
78 | /* ------------------------------------------------------------------------- */ | |
79 | ||
80 | static void rsync_xal_free(item_list *xalp) | |
81 | { | |
82 | size_t i; | |
83 | rsync_xa *rxas = xalp->items; | |
84 | ||
85 | for (i = 0; i < xalp->count; i++) { | |
86 | free(rxas[i].datum); | |
87 | /*free(rxas[i].name);*/ | |
88 | } | |
89 | xalp->count = 0; | |
90 | } | |
91 | ||
92 | void free_xattr(statx *sxp) | |
93 | { | |
94 | if (!sxp->xattr) | |
95 | return; | |
96 | rsync_xal_free(sxp->xattr); | |
97 | free(sxp->xattr); | |
98 | sxp->xattr = NULL; | |
99 | } | |
100 | ||
101 | static int rsync_xal_compare_names(const void *x1, const void *x2) | |
102 | { | |
103 | const rsync_xa *xa1 = x1; | |
104 | const rsync_xa *xa2 = x2; | |
105 | return strcmp(xa1->name, xa2->name); | |
106 | } | |
107 | ||
108 | static ssize_t get_xattr_names(const char *fname) | |
109 | { | |
110 | ssize_t list_len; | |
111 | ||
112 | if (!namebuf) { | |
113 | namebuf_len = 1024; | |
114 | namebuf = new_array(char, namebuf_len); | |
115 | if (!namebuf) | |
116 | out_of_memory("get_xattr_names"); | |
117 | } | |
118 | ||
119 | /* The length returned includes all the '\0' terminators. */ | |
120 | list_len = sys_llistxattr(fname, namebuf, namebuf_len); | |
121 | if (list_len > (ssize_t)namebuf_len) { | |
122 | list_len = -1; | |
123 | errno = ERANGE; | |
124 | } | |
125 | if (list_len >= 0) | |
126 | return list_len; | |
127 | if (errno == ENOTSUP) | |
128 | return 0; | |
129 | if (errno == ERANGE) { | |
130 | list_len = sys_llistxattr(fname, NULL, 0); | |
131 | if (list_len < 0) { | |
132 | rsyserr(FERROR, errno, | |
133 | "get_xattr_names: llistxattr(\"%s\",0) failed", | |
134 | fname); | |
135 | return -1; | |
136 | } | |
137 | if (namebuf_len) | |
138 | free(namebuf); | |
139 | namebuf_len = list_len + 1024; | |
140 | namebuf = new_array(char, namebuf_len); | |
141 | if (!namebuf) | |
142 | out_of_memory("get_xattr_names"); | |
143 | list_len = sys_llistxattr(fname, namebuf, namebuf_len); | |
144 | if (list_len >= 0) | |
145 | return list_len; | |
146 | } | |
147 | ||
148 | rsyserr(FERROR, errno, | |
149 | "get_xattr_names: llistxattr(\"%s\",%ld) failed", | |
150 | fname, (long)namebuf_len); | |
151 | return -1; | |
152 | } | |
153 | ||
154 | /* On entry, the *len_ptr parameter contains the size of the extra space we | |
155 | * should allocate when we create a buffer for the data. On exit, it contains | |
156 | * the length of the datum. */ | |
157 | static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr, | |
158 | int no_missing_error) | |
159 | { | |
160 | size_t datum_len = sys_lgetxattr(fname, name, NULL, 0); | |
161 | char *ptr; | |
162 | ||
163 | if (datum_len == (size_t)-1) { | |
164 | if (errno == ENOTSUP || no_missing_error) | |
165 | return NULL; | |
166 | rsyserr(FERROR, errno, | |
167 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed", | |
168 | fname, name); | |
169 | return NULL; | |
170 | } | |
171 | ||
172 | if (datum_len + *len_ptr < datum_len /* checks for overflow */ | |
173 | || !(ptr = new_array(char, datum_len + *len_ptr))) | |
174 | out_of_memory("get_xattr_data"); | |
175 | ||
176 | *len_ptr = datum_len; | |
177 | ||
178 | if (datum_len) { | |
179 | size_t len = sys_lgetxattr(fname, name, ptr, datum_len); | |
180 | if (len != datum_len) { | |
181 | if (len == (size_t)-1) { | |
182 | rsyserr(FERROR, errno, | |
183 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)" | |
184 | " failed", fname, name, (long)datum_len); | |
185 | } else { | |
186 | rprintf(FERROR, | |
187 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)" | |
188 | " returned %ld\n", fname, name, | |
189 | (long)datum_len, (long)len); | |
190 | } | |
191 | free(ptr); | |
192 | return NULL; | |
193 | } | |
194 | } | |
195 | ||
196 | return ptr; | |
197 | } | |
198 | ||
199 | static int rsync_xal_get(const char *fname, item_list *xalp) | |
200 | { | |
201 | ssize_t list_len, name_len; | |
202 | size_t datum_len, name_offset; | |
203 | char *name, *ptr; | |
204 | #ifdef HAVE_LINUX_XATTRS | |
205 | int user_only = am_sender ? 0 : !am_root; | |
206 | #endif | |
207 | ||
208 | /* This puts the name list into the "namebuf" buffer. */ | |
209 | if ((list_len = get_xattr_names(fname)) < 0) | |
210 | return -1; | |
211 | ||
212 | for (name = namebuf; list_len > 0; name += name_len) { | |
213 | rsync_xa *rxas; | |
214 | ||
215 | name_len = strlen(name) + 1; | |
216 | list_len -= name_len; | |
217 | ||
218 | #ifdef HAVE_LINUX_XATTRS | |
219 | /* We always ignore the system namespace, and non-root | |
220 | * ignores everything but the user namespace. */ | |
221 | if (user_only ? !HAS_PREFIX(name, USER_PREFIX) | |
222 | : HAS_PREFIX(name, SYSTEM_PREFIX)) | |
223 | continue; | |
224 | #endif | |
225 | ||
9439c0cb WD |
226 | if (am_root < 0 && name_len == XSTAT_LEN + 1 |
227 | && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0) | |
228 | continue; | |
229 | ||
16edf865 WD |
230 | datum_len = name_len; /* Pass extra size to get_xattr_data() */ |
231 | if (!(ptr = get_xattr_data(fname, name, &datum_len, 0))) | |
232 | return -1; | |
233 | ||
234 | if (datum_len > MAX_FULL_DATUM) { | |
235 | /* For large datums, we store a flag and a checksum. */ | |
236 | name_offset = 1 + MAX_DIGEST_LEN; | |
237 | sum_init(checksum_seed); | |
238 | sum_update(ptr, datum_len); | |
239 | free(ptr); | |
240 | ||
241 | if (!(ptr = new_array(char, name_offset + name_len))) | |
242 | out_of_memory("rsync_xal_get"); | |
243 | *ptr = XSTATE_ABBREV; | |
244 | sum_end(ptr + 1); | |
245 | } else | |
246 | name_offset = datum_len; | |
247 | ||
9439c0cb WD |
248 | #ifdef HAVE_LINUX_XATTRS |
249 | if (am_root < 0 && name_len > RPRE_LEN | |
250 | && HAS_PREFIX(name, RSYNC_PREFIX)) { | |
251 | name += RPRE_LEN; | |
252 | name_len -= RPRE_LEN; | |
253 | } | |
254 | #endif | |
255 | ||
16edf865 WD |
256 | rxas = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL); |
257 | rxas->name = ptr + name_offset; | |
258 | memcpy(rxas->name, name, name_len); | |
259 | rxas->datum = ptr; | |
260 | rxas->name_len = name_len; | |
261 | rxas->datum_len = datum_len; | |
262 | } | |
263 | if (xalp->count > 1) | |
264 | qsort(xalp->items, xalp->count, sizeof (rsync_xa), rsync_xal_compare_names); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | /* Read the xattr(s) for this filename. */ | |
269 | int get_xattr(const char *fname, statx *sxp) | |
270 | { | |
271 | sxp->xattr = new(item_list); | |
272 | *sxp->xattr = empty_xattr; | |
273 | if (rsync_xal_get(fname, sxp->xattr) < 0) { | |
274 | free_xattr(sxp); | |
275 | return -1; | |
276 | } | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static int find_matching_xattr(item_list *xalp) | |
281 | { | |
282 | size_t i, j; | |
283 | item_list *lst = rsync_xal_l.items; | |
284 | ||
285 | for (i = 0; i < rsync_xal_l.count; i++) { | |
286 | rsync_xa *rxas1 = lst[i].items; | |
287 | rsync_xa *rxas2 = xalp->items; | |
288 | ||
289 | /* Wrong number of elements? */ | |
290 | if (lst[i].count != xalp->count) | |
291 | continue; | |
292 | /* any elements different? */ | |
293 | for (j = 0; j < xalp->count; j++) { | |
294 | if (rxas1[j].name_len != rxas2[j].name_len | |
295 | || rxas1[j].datum_len != rxas2[j].datum_len | |
296 | || strcmp(rxas1[j].name, rxas2[j].name)) | |
297 | break; | |
298 | if (rxas1[j].datum_len > MAX_FULL_DATUM) { | |
299 | if (memcmp(rxas1[j].datum + 1, | |
300 | rxas2[j].datum + 1, | |
301 | MAX_DIGEST_LEN) != 0) | |
302 | break; | |
303 | } else { | |
304 | if (memcmp(rxas1[j].datum, rxas2[j].datum, | |
305 | rxas2[j].datum_len)) | |
306 | break; | |
307 | } | |
308 | } | |
309 | /* no differences found. This is The One! */ | |
310 | if (j == xalp->count) | |
311 | return i; | |
312 | } | |
313 | ||
314 | return -1; | |
315 | } | |
316 | ||
317 | /* Store *xalp on the end of rsync_xal_l */ | |
318 | static void rsync_xal_store(item_list *xalp) | |
319 | { | |
320 | item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL); | |
321 | /* Since the following call starts a new list, we know it will hold the | |
322 | * entire initial-count, not just enough space for one new item. */ | |
323 | *new_lst = empty_xattr; | |
324 | (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count); | |
325 | memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa)); | |
326 | new_lst->count = xalp->count; | |
327 | xalp->count = 0; | |
328 | } | |
329 | ||
330 | /* Send the make_xattr()-generated xattr list for this flist entry. */ | |
331 | int send_xattr(statx *sxp, int f) | |
332 | { | |
333 | int ndx = find_matching_xattr(sxp->xattr); | |
334 | ||
335 | /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */ | |
f31514ad | 336 | write_varint(f, ndx + 1); |
16edf865 WD |
337 | |
338 | if (ndx < 0) { | |
339 | rsync_xa *rxa; | |
340 | int count = sxp->xattr->count; | |
f31514ad | 341 | write_varint(f, count); |
16edf865 WD |
342 | for (rxa = sxp->xattr->items; count--; rxa++) { |
343 | #ifdef HAVE_LINUX_XATTRS | |
f31514ad WD |
344 | write_varint(f, rxa->name_len); |
345 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
346 | write_buf(f, rxa->name, rxa->name_len); |
347 | #else | |
348 | /* We strip the rsync prefix from disguised namespaces | |
349 | * and put everything else in the user namespace. */ | |
350 | if (HAS_PREFIX(rxa->name, RSYNC_PREFIX) | |
351 | && rxa->name[RPRE_LEN] != '%') { | |
f31514ad WD |
352 | write_varint(f, rxa->name_len - RPRE_LEN); |
353 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
354 | write_buf(f, rxa->name + RPRE_LEN, rxa->name_len - RPRE_LEN); |
355 | } else { | |
f31514ad WD |
356 | write_varint(f, rxa->name_len + UPRE_LEN); |
357 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
358 | write_buf(f, USER_PREFIX, UPRE_LEN); |
359 | write_buf(f, rxa->name, rxa->name_len); | |
360 | } | |
361 | #endif | |
362 | if (rxa->datum_len > MAX_FULL_DATUM) | |
363 | write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN); | |
364 | else | |
365 | write_buf(f, rxa->datum, rxa->datum_len); | |
366 | } | |
367 | ndx = rsync_xal_l.count; /* pre-incremented count */ | |
368 | rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */ | |
369 | } | |
370 | ||
371 | return ndx; | |
372 | } | |
373 | ||
374 | /* Return a flag indicating if we need to change a file's xattrs. If | |
375 | * "find_all" is specified, also mark any abbreviated xattrs that we | |
376 | * need so that send_xattr_request() can tell the sender about them. */ | |
377 | int xattr_diff(struct file_struct *file, statx *sxp, int find_all) | |
378 | { | |
379 | item_list *lst = rsync_xal_l.items; | |
380 | rsync_xa *snd_rxa, *rec_rxa; | |
381 | int snd_cnt, rec_cnt; | |
382 | int cmp, same, xattrs_equal = 1; | |
383 | ||
384 | if (sxp && XATTR_READY(*sxp)) { | |
385 | rec_rxa = sxp->xattr->items; | |
386 | rec_cnt = sxp->xattr->count; | |
387 | } else { | |
388 | rec_rxa = NULL; | |
389 | rec_cnt = 0; | |
390 | } | |
391 | ||
392 | if (F_XATTR(file) >= 0) | |
393 | lst += F_XATTR(file); | |
394 | else | |
395 | lst = &empty_xattr; | |
396 | ||
397 | snd_rxa = lst->items; | |
398 | snd_cnt = lst->count; | |
399 | ||
400 | /* If the count of the sender's xattrs is different from our | |
401 | * (receiver's) xattrs, the lists are not the same. */ | |
402 | if (snd_cnt != rec_cnt) { | |
403 | if (!find_all) | |
404 | return 1; | |
405 | xattrs_equal = 0; | |
406 | } | |
407 | ||
408 | while (snd_cnt) { | |
409 | cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1; | |
410 | if (cmp > 0) | |
411 | same = 0; | |
412 | else if (snd_rxa->datum_len > MAX_FULL_DATUM) { | |
413 | same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len | |
414 | && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1, | |
415 | MAX_DIGEST_LEN) == 0; | |
416 | /* Flag unrequested items that we need. */ | |
417 | if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV) | |
418 | snd_rxa->datum[0] = XSTATE_TODO; | |
419 | } else { | |
420 | same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len | |
421 | && memcmp(snd_rxa->datum, rec_rxa->datum, | |
422 | snd_rxa->datum_len) == 0; | |
423 | } | |
424 | if (!same) { | |
425 | if (!find_all) | |
426 | return 1; | |
427 | xattrs_equal = 0; | |
428 | } | |
429 | ||
430 | if (cmp <= 0) { | |
431 | snd_rxa++; | |
432 | snd_cnt--; | |
433 | } | |
434 | if (cmp >= 0) { | |
435 | rec_rxa++; | |
436 | rec_cnt--; | |
437 | } | |
438 | } | |
439 | ||
440 | if (rec_cnt) | |
441 | xattrs_equal = 0; | |
442 | ||
443 | return !xattrs_equal; | |
444 | } | |
445 | ||
446 | /* When called by the generator with a NULL fname, this tells the sender | |
447 | * which abbreviated xattr values we need. When called by the sender | |
448 | * (with a non-NULL fname), we send all the extra xattr data it needs. */ | |
449 | void send_xattr_request(const char *fname, struct file_struct *file, int f_out) | |
450 | { | |
451 | item_list *lst = rsync_xal_l.items; | |
452 | int j, cnt, prior_req = -1; | |
453 | rsync_xa *rxa; | |
454 | ||
455 | lst += F_XATTR(file); | |
456 | cnt = lst->count; | |
457 | for (rxa = lst->items, j = 0; j < cnt; rxa++, j++) { | |
458 | if (rxa->datum_len <= MAX_FULL_DATUM) | |
459 | continue; | |
460 | switch (rxa->datum[0]) { | |
461 | case XSTATE_LOCAL: | |
462 | /* Items set locally will get cached by receiver. */ | |
463 | rxa->datum[0] = XSTATE_DONE; | |
464 | continue; | |
465 | case XSTATE_TODO: | |
466 | break; | |
467 | default: | |
468 | continue; | |
469 | } | |
470 | ||
471 | /* Flag that we handled this abbreviated item. */ | |
472 | rxa->datum[0] = XSTATE_DONE; | |
473 | ||
f31514ad | 474 | write_varint(f_out, j - prior_req); |
16edf865 WD |
475 | prior_req = j; |
476 | ||
477 | if (fname) { | |
478 | size_t len = 0; | |
479 | char *ptr; | |
480 | ||
481 | /* Re-read the long datum. */ | |
482 | if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) | |
483 | continue; | |
484 | ||
f31514ad | 485 | write_varint(f_out, len); /* length might have changed! */ |
16edf865 WD |
486 | write_buf(f_out, ptr, len); |
487 | free(ptr); | |
488 | } | |
489 | } | |
490 | ||
491 | write_byte(f_out, 0); /* end the list */ | |
492 | } | |
493 | ||
494 | /* Any items set locally by the generator that the receiver doesn't | |
495 | * get told about get changed back to XSTATE_ABBREV. */ | |
496 | void xattr_clear_locals(struct file_struct *file) | |
497 | { | |
498 | item_list *lst = rsync_xal_l.items; | |
499 | rsync_xa *rxa; | |
500 | int cnt; | |
501 | ||
502 | if (F_XATTR(file) < 0) | |
503 | return; | |
504 | ||
505 | lst += F_XATTR(file); | |
506 | cnt = lst->count; | |
507 | for (rxa = lst->items; cnt--; rxa++) { | |
508 | if (rxa->datum_len <= MAX_FULL_DATUM) | |
509 | continue; | |
510 | if (rxa->datum[0] == XSTATE_LOCAL) | |
511 | rxa->datum[0] = XSTATE_ABBREV; | |
512 | } | |
513 | } | |
514 | ||
515 | /* When called by the sender, read the request from the generator and mark | |
516 | * any needed xattrs with a flag that lets us know they need to be sent to | |
517 | * the receiver. When called by the receiver, reads the sent data and | |
518 | * stores it in place of its checksum. */ | |
519 | void recv_xattr_request(struct file_struct *file, int f_in) | |
520 | { | |
521 | item_list *lst = rsync_xal_l.items; | |
522 | char *old_datum, *name; | |
523 | rsync_xa *rxa; | |
524 | int rel_pos, cnt; | |
525 | ||
526 | if (F_XATTR(file) < 0) { | |
527 | rprintf(FERROR, "recv_xattr_request: internal data error!\n"); | |
528 | exit_cleanup(RERR_STREAMIO); | |
529 | } | |
530 | lst += F_XATTR(file); | |
531 | ||
532 | cnt = lst->count; | |
533 | rxa = lst->items; | |
534 | rxa -= 1; | |
f31514ad | 535 | while ((rel_pos = read_varint(f_in)) != 0) { |
16edf865 WD |
536 | rxa += rel_pos; |
537 | cnt -= rel_pos; | |
538 | if (cnt < 0 || rxa->datum_len <= MAX_FULL_DATUM | |
539 | || rxa->datum[0] != XSTATE_ABBREV) { | |
540 | rprintf(FERROR, "recv_xattr_request: internal abbrev error!\n"); | |
541 | exit_cleanup(RERR_STREAMIO); | |
542 | } | |
543 | ||
544 | if (am_sender) { | |
545 | rxa->datum[0] = XSTATE_TODO; | |
546 | continue; | |
547 | } | |
548 | ||
549 | old_datum = rxa->datum; | |
f31514ad | 550 | rxa->datum_len = read_varint(f_in); |
16edf865 WD |
551 | |
552 | if (rxa->name_len + rxa->datum_len < rxa->name_len) | |
553 | out_of_memory("recv_xattr_request"); /* overflow */ | |
554 | rxa->datum = new_array(char, rxa->datum_len + rxa->name_len); | |
555 | if (!rxa->datum) | |
556 | out_of_memory("recv_xattr_request"); | |
557 | name = rxa->datum + rxa->datum_len; | |
558 | memcpy(name, rxa->name, rxa->name_len); | |
559 | rxa->name = name; | |
560 | free(old_datum); | |
561 | read_buf(f_in, rxa->datum, rxa->datum_len); | |
562 | } | |
563 | } | |
564 | ||
565 | /* ------------------------------------------------------------------------- */ | |
566 | ||
567 | /* receive and build the rsync_xattr_lists */ | |
568 | void receive_xattr(struct file_struct *file, int f) | |
569 | { | |
570 | static item_list temp_xattr = EMPTY_ITEM_LIST; | |
571 | int count; | |
f31514ad | 572 | int ndx = read_varint(f); |
16edf865 WD |
573 | |
574 | if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) { | |
575 | rprintf(FERROR, "receive_xattr: xa index %d out of" | |
576 | " range for %s\n", ndx, f_name(file, NULL)); | |
577 | exit_cleanup(RERR_STREAMIO); | |
578 | } | |
579 | ||
580 | if (ndx != 0) { | |
581 | F_XATTR(file) = ndx - 1; | |
582 | return; | |
583 | } | |
584 | ||
f31514ad | 585 | if ((count = read_varint(f)) != 0) { |
16edf865 WD |
586 | (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count); |
587 | temp_xattr.count = 0; | |
588 | } | |
589 | ||
590 | while (count--) { | |
591 | char *ptr, *name; | |
592 | rsync_xa *rxa; | |
f31514ad WD |
593 | size_t name_len = read_varint(f); |
594 | size_t datum_len = read_varint(f); | |
16edf865 | 595 | size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len; |
9439c0cb | 596 | size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0; |
16edf865 WD |
597 | if (dget_len + extra_len < dget_len) |
598 | out_of_memory("receive_xattr"); /* overflow */ | |
16edf865 WD |
599 | if (dget_len + extra_len + name_len < dget_len) |
600 | out_of_memory("receive_xattr"); /* overflow */ | |
601 | ptr = new_array(char, dget_len + extra_len + name_len); | |
602 | if (!ptr) | |
603 | out_of_memory("receive_xattr"); | |
604 | name = ptr + dget_len + extra_len; | |
605 | read_buf(f, name, name_len); | |
606 | if (dget_len == datum_len) | |
607 | read_buf(f, ptr, dget_len); | |
608 | else { | |
609 | *ptr = XSTATE_ABBREV; | |
610 | read_buf(f, ptr + 1, MAX_DIGEST_LEN); | |
611 | } | |
612 | #ifdef HAVE_LINUX_XATTRS | |
613 | /* Non-root can only save the user namespace. */ | |
9439c0cb WD |
614 | if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) { |
615 | if (!am_root) { | |
616 | free(ptr); | |
617 | continue; | |
618 | } | |
619 | name -= RPRE_LEN; | |
620 | name_len += RPRE_LEN; | |
621 | memcpy(name, RSYNC_PREFIX, RPRE_LEN); | |
16edf865 WD |
622 | } |
623 | #else | |
624 | /* This OS only has a user namespace, so we either | |
625 | * strip the user prefix, or we put a non-user | |
626 | * namespace inside our rsync hierarchy. */ | |
627 | if (HAS_PREFIX(name, USER_PREFIX)) { | |
628 | name += UPRE_LEN; | |
629 | name_len -= UPRE_LEN; | |
630 | } else if (am_root) { | |
631 | name -= RPRE_LEN; | |
632 | name_len += RPRE_LEN; | |
633 | memcpy(name, RSYNC_PREFIX, RPRE_LEN); | |
634 | } else { | |
635 | free(ptr); | |
636 | continue; | |
637 | } | |
638 | #endif | |
9439c0cb WD |
639 | if (am_root < 0 && name_len == XSTAT_LEN + 1 |
640 | && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0) { | |
641 | free(ptr); | |
642 | continue; | |
643 | } | |
16edf865 WD |
644 | rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1); |
645 | rxa->name = name; | |
646 | rxa->datum = ptr; | |
647 | rxa->name_len = name_len; | |
648 | rxa->datum_len = datum_len; | |
649 | } | |
650 | ||
651 | ndx = rsync_xal_l.count; /* pre-incremented count */ | |
652 | rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */ | |
653 | ||
654 | F_XATTR(file) = ndx; | |
655 | } | |
656 | ||
657 | /* Turn the xattr data in statx into cached xattr data, setting the index | |
658 | * values in the file struct. */ | |
659 | void cache_xattr(struct file_struct *file, statx *sxp) | |
660 | { | |
661 | int ndx; | |
662 | ||
663 | if (!sxp->xattr) | |
664 | return; | |
665 | ||
666 | ndx = find_matching_xattr(sxp->xattr); | |
667 | if (ndx < 0) | |
668 | rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */ | |
669 | ||
670 | F_XATTR(file) = ndx; | |
671 | } | |
672 | ||
673 | static int rsync_xal_set(const char *fname, item_list *xalp, | |
674 | const char *fnamecmp, statx *sxp) | |
675 | { | |
676 | rsync_xa *rxas = xalp->items; | |
677 | ssize_t list_len; | |
678 | size_t i, len; | |
679 | char *name, *ptr, sum[MAX_DIGEST_LEN]; | |
680 | int name_len, ret = 0; | |
681 | ||
682 | /* This puts the current name list into the "namebuf" buffer. */ | |
683 | if ((list_len = get_xattr_names(fname)) < 0) | |
684 | return -1; | |
685 | ||
686 | for (i = 0; i < xalp->count; i++) { | |
687 | name = rxas[i].name; | |
688 | ||
689 | if (XATTR_ABBREV(rxas[i])) { | |
690 | /* See if the fnamecmp version is identical. */ | |
691 | len = name_len = rxas[i].name_len; | |
692 | if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) { | |
693 | still_abbrev: | |
694 | if (am_generator) | |
695 | continue; | |
696 | rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n", | |
697 | rxas[i].name, full_fname(fname)); | |
698 | ret = -1; | |
699 | continue; | |
700 | } | |
701 | if (len != rxas[i].datum_len) { | |
702 | free(ptr); | |
703 | goto still_abbrev; | |
704 | } | |
705 | ||
706 | sum_init(checksum_seed); | |
707 | sum_update(ptr, len); | |
708 | sum_end(sum); | |
709 | if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) { | |
710 | free(ptr); | |
711 | goto still_abbrev; | |
712 | } | |
713 | ||
714 | if (fname == fnamecmp) | |
715 | ; /* Value is already set when identical */ | |
716 | else if (sys_lsetxattr(fname, name, ptr, len) < 0) { | |
717 | rsyserr(FERROR, errno, | |
718 | "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed", | |
719 | fname, name); | |
720 | ret = -1; | |
721 | } else /* make sure caller sets mtime */ | |
722 | sxp->st.st_mtime = (time_t)-1; | |
723 | ||
724 | if (am_generator) { /* generator items stay abbreviated */ | |
725 | if (rxas[i].datum[0] == XSTATE_ABBREV) | |
726 | rxas[i].datum[0] = XSTATE_LOCAL; | |
727 | free(ptr); | |
728 | continue; | |
729 | } | |
730 | ||
731 | memcpy(ptr + len, name, name_len); | |
732 | free(rxas[i].datum); | |
733 | ||
734 | rxas[i].name = name = ptr + len; | |
735 | rxas[i].datum = ptr; | |
736 | continue; | |
737 | } | |
738 | ||
739 | if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) { | |
740 | rsyserr(FERROR, errno, | |
741 | "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed", | |
742 | fname, name); | |
743 | ret = -1; | |
744 | } else /* make sure caller sets mtime */ | |
745 | sxp->st.st_mtime = (time_t)-1; | |
746 | } | |
747 | ||
748 | /* Remove any extraneous names. */ | |
749 | for (name = namebuf; list_len > 0; name += name_len) { | |
750 | name_len = strlen(name) + 1; | |
751 | list_len -= name_len; | |
752 | ||
753 | #ifdef HAVE_LINUX_XATTRS | |
754 | /* We always ignore the system namespace, and non-root | |
755 | * ignores everything but the user namespace. */ | |
756 | if (am_root ? HAS_PREFIX(name, SYSTEM_PREFIX) | |
757 | : !HAS_PREFIX(name, USER_PREFIX)) | |
758 | continue; | |
759 | #endif | |
760 | ||
761 | for (i = 0; i < xalp->count; i++) { | |
762 | if (strcmp(name, rxas[i].name) == 0) | |
763 | break; | |
764 | } | |
765 | if (i == xalp->count) { | |
766 | if (sys_lremovexattr(fname, name) < 0) { | |
767 | rsyserr(FERROR, errno, | |
768 | "rsync_xal_clear: lremovexattr(\"%s\",\"%s\") failed", | |
769 | fname, name); | |
770 | ret = -1; | |
771 | } else /* make sure caller sets mtime */ | |
772 | sxp->st.st_mtime = (time_t)-1; | |
773 | } | |
774 | } | |
775 | ||
776 | return ret; | |
777 | } | |
778 | ||
779 | /* Set extended attributes on indicated filename. */ | |
780 | int set_xattr(const char *fname, const struct file_struct *file, | |
781 | const char *fnamecmp, statx *sxp) | |
782 | { | |
783 | int ndx; | |
784 | item_list *lst = rsync_xal_l.items; | |
785 | ||
786 | if (dry_run) | |
787 | return 1; /* FIXME: --dry-run needs to compute this value */ | |
788 | ||
789 | if (read_only || list_only) { | |
790 | errno = EROFS; | |
791 | return -1; | |
792 | } | |
793 | ||
794 | ndx = F_XATTR(file); | |
795 | return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp); | |
796 | } | |
797 | ||
9439c0cb WD |
798 | int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst) |
799 | { | |
800 | int mode, rdev_major, rdev_minor, uid, gid, len; | |
801 | char buf[256]; | |
802 | ||
803 | if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode)) | |
804 | return -1; | |
805 | ||
806 | if (xst) | |
807 | *xst = *fst; | |
808 | else | |
809 | xst = fst; | |
810 | if (fname) { | |
811 | fd = -1; | |
812 | len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1); | |
813 | } else { | |
814 | fname = "fd"; | |
815 | len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1); | |
816 | } | |
817 | if (len >= (int)sizeof buf) { | |
818 | len = -1; | |
819 | errno = ERANGE; | |
820 | } | |
821 | if (len < 0) { | |
822 | if (errno == ENOTSUP || errno == ENOATTR) | |
823 | return -1; | |
824 | if (errno == EPERM && S_ISLNK(fst->st_mode)) { | |
825 | xst->st_uid = 0; | |
826 | xst->st_gid = 0; | |
827 | return 0; | |
828 | } | |
829 | rsyserr(FERROR, errno, "failed to read xattr %s for %s", | |
830 | XSTAT_ATTR, full_fname(fname)); | |
831 | return -1; | |
832 | } | |
833 | buf[len] = '\0'; | |
834 | ||
835 | if (sscanf(buf, "%o %d,%d %d:%d", | |
836 | &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) { | |
837 | rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n", | |
838 | XSTAT_ATTR, full_fname(fname), buf); | |
839 | exit_cleanup(RERR_FILEIO); | |
840 | } | |
841 | ||
842 | xst->st_mode = from_wire_mode(mode); | |
843 | xst->st_rdev = MAKEDEV(rdev_major, rdev_minor); | |
844 | xst->st_uid = uid; | |
845 | xst->st_gid = gid; | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | int set_stat_xattr(const char *fname, struct file_struct *file) | |
851 | { | |
852 | STRUCT_STAT fst, xst; | |
853 | dev_t rdev; | |
854 | mode_t mode, fmode; | |
855 | ||
856 | if (dry_run) | |
857 | return 0; | |
858 | ||
859 | if (read_only || list_only) { | |
860 | rsyserr(FERROR, EROFS, "failed to write xattr %s for %s", | |
861 | XSTAT_ATTR, full_fname(fname)); | |
862 | return -1; | |
863 | } | |
864 | ||
865 | if (x_lstat(fname, &fst, &xst) < 0) { | |
866 | rsyserr(FERROR, errno, "failed to re-stat %s", | |
867 | full_fname(fname)); | |
868 | return -1; | |
869 | } | |
870 | ||
871 | fst.st_mode &= (_S_IFMT | CHMOD_BITS); | |
872 | fmode = file->mode & (_S_IFMT | CHMOD_BITS); | |
873 | ||
874 | if (IS_DEVICE(fmode) || IS_SPECIAL(fmode)) { | |
875 | uint32 *devp = F_RDEV_P(file); | |
876 | rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)); | |
877 | } else | |
878 | rdev = 0; | |
879 | ||
880 | /* Dump the special permissions and enable full owner access. */ | |
881 | mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS) | |
882 | | (S_ISDIR(fst.st_mode) ? 0700 : 0600); | |
883 | if (fst.st_mode != mode) | |
884 | do_chmod(fname, mode); | |
885 | if (!IS_DEVICE(fst.st_mode) && !IS_SPECIAL(fst.st_mode)) | |
886 | fst.st_rdev = 0; /* just in case */ | |
887 | ||
888 | if (mode == fmode && fst.st_rdev == rdev | |
889 | && fst.st_uid == F_UID(file) && fst.st_gid == F_GID(file)) { | |
890 | /* xst.st_mode will be 0 if there's no current stat xattr */ | |
891 | if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) { | |
892 | rsyserr(FERROR, errno, | |
893 | "delete of stat xattr failed for %s", | |
894 | full_fname(fname)); | |
895 | return -1; | |
896 | } | |
897 | return 0; | |
898 | } | |
899 | ||
900 | if (xst.st_mode != fmode || xst.st_rdev != rdev | |
901 | || xst.st_uid != F_UID(file) || xst.st_gid != F_GID(file)) { | |
902 | char buf[256]; | |
903 | int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u", | |
904 | to_wire_mode(fmode), | |
905 | (int)major(rdev), (int)minor(rdev), | |
906 | (int)F_UID(file), (int)F_GID(file)); | |
907 | if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) { | |
908 | if (errno == EPERM && S_ISLNK(fst.st_mode)) | |
909 | return 0; | |
910 | rsyserr(FERROR, errno, | |
911 | "failed to write xattr %s for %s", | |
912 | XSTAT_ATTR, full_fname(fname)); | |
913 | return -1; | |
914 | } | |
915 | } | |
916 | ||
917 | return 0; | |
918 | } | |
919 | ||
920 | int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
921 | { | |
922 | int ret = do_stat(fname, fst); | |
923 | if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst) | |
924 | xst->st_mode = 0; | |
925 | return ret; | |
926 | } | |
927 | ||
928 | int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
929 | { | |
930 | int ret = do_lstat(fname, fst); | |
931 | if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst) | |
932 | xst->st_mode = 0; | |
933 | return ret; | |
934 | } | |
935 | ||
936 | int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
937 | { | |
938 | int ret = do_fstat(fd, fst); | |
939 | if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst) | |
940 | xst->st_mode = 0; | |
941 | return ret; | |
942 | } | |
943 | ||
16edf865 | 944 | #endif /* SUPPORT_XATTRS */ |