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 | |
8e41b68e WD |
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. | |
16edf865 WD |
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 | |
4fd842f9 | 19 | * with this program; if not, visit the http://fsf.org website. |
16edf865 WD |
20 | */ |
21 | ||
22 | #include "rsync.h" | |
1b42f628 | 23 | #include "ifuncs.h" |
16edf865 WD |
24 | #include "lib/sysxattrs.h" |
25 | ||
26 | #ifdef SUPPORT_XATTRS | |
27 | ||
28 | extern int dry_run; | |
29 | extern int am_root; | |
30 | extern int am_sender; | |
31 | extern int am_generator; | |
32 | extern int read_only; | |
33 | extern int list_only; | |
524eaa82 | 34 | extern int preserve_xattrs; |
16edf865 WD |
35 | extern int checksum_seed; |
36 | ||
37 | #define RSYNC_XAL_INITIAL 5 | |
38 | #define RSYNC_XAL_LIST_INITIAL 100 | |
39 | ||
40 | #define MAX_FULL_DATUM 32 | |
41 | ||
42 | #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \ | |
43 | && strncmp(str, prfx, sizeof (prfx) - 1) == 0) | |
44 | ||
45 | #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len) | |
46 | ||
47 | #define XSTATE_ABBREV 0 | |
48 | #define XSTATE_DONE 1 | |
49 | #define XSTATE_TODO 2 | |
50 | #define XSTATE_LOCAL 3 | |
51 | ||
52 | #define USER_PREFIX "user." | |
53 | #define UPRE_LEN ((int)sizeof USER_PREFIX - 1) | |
54 | #define SYSTEM_PREFIX "system." | |
55 | #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1) | |
56 | ||
57 | #ifdef HAVE_LINUX_XATTRS | |
9439c0cb WD |
58 | #define MIGHT_NEED_RPRE (am_root < 0) |
59 | #define RSYNC_PREFIX USER_PREFIX "rsync." | |
16edf865 | 60 | #else |
9439c0cb | 61 | #define MIGHT_NEED_RPRE am_root |
16edf865 | 62 | #define RSYNC_PREFIX "rsync." |
16edf865 | 63 | #endif |
9439c0cb WD |
64 | #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1) |
65 | ||
66 | #define XSTAT_ATTR RSYNC_PREFIX "%stat" | |
16edf865 WD |
67 | |
68 | typedef struct { | |
69 | char *datum, *name; | |
70 | size_t datum_len, name_len; | |
71 | } rsync_xa; | |
72 | ||
73 | static size_t namebuf_len = 0; | |
74 | static char *namebuf = NULL; | |
75 | ||
76 | static item_list empty_xattr = EMPTY_ITEM_LIST; | |
77 | static item_list rsync_xal_l = EMPTY_ITEM_LIST; | |
78 | ||
79 | /* ------------------------------------------------------------------------- */ | |
80 | ||
81 | static void rsync_xal_free(item_list *xalp) | |
82 | { | |
83 | size_t i; | |
84 | rsync_xa *rxas = xalp->items; | |
85 | ||
86 | for (i = 0; i < xalp->count; i++) { | |
87 | free(rxas[i].datum); | |
88 | /*free(rxas[i].name);*/ | |
89 | } | |
90 | xalp->count = 0; | |
91 | } | |
92 | ||
93 | void free_xattr(statx *sxp) | |
94 | { | |
95 | if (!sxp->xattr) | |
96 | return; | |
97 | rsync_xal_free(sxp->xattr); | |
98 | free(sxp->xattr); | |
99 | sxp->xattr = NULL; | |
100 | } | |
101 | ||
102 | static int rsync_xal_compare_names(const void *x1, const void *x2) | |
103 | { | |
104 | const rsync_xa *xa1 = x1; | |
105 | const rsync_xa *xa2 = x2; | |
106 | return strcmp(xa1->name, xa2->name); | |
107 | } | |
108 | ||
109 | static ssize_t get_xattr_names(const char *fname) | |
110 | { | |
111 | ssize_t list_len; | |
112 | ||
113 | if (!namebuf) { | |
114 | namebuf_len = 1024; | |
115 | namebuf = new_array(char, namebuf_len); | |
116 | if (!namebuf) | |
117 | out_of_memory("get_xattr_names"); | |
118 | } | |
119 | ||
120 | /* The length returned includes all the '\0' terminators. */ | |
121 | list_len = sys_llistxattr(fname, namebuf, namebuf_len); | |
122 | if (list_len > (ssize_t)namebuf_len) { | |
123 | list_len = -1; | |
124 | errno = ERANGE; | |
125 | } | |
126 | if (list_len >= 0) | |
127 | return list_len; | |
128 | if (errno == ENOTSUP) | |
129 | return 0; | |
130 | if (errno == ERANGE) { | |
131 | list_len = sys_llistxattr(fname, NULL, 0); | |
132 | if (list_len < 0) { | |
133 | rsyserr(FERROR, errno, | |
134 | "get_xattr_names: llistxattr(\"%s\",0) failed", | |
135 | fname); | |
136 | return -1; | |
137 | } | |
138 | if (namebuf_len) | |
139 | free(namebuf); | |
140 | namebuf_len = list_len + 1024; | |
141 | namebuf = new_array(char, namebuf_len); | |
142 | if (!namebuf) | |
143 | out_of_memory("get_xattr_names"); | |
144 | list_len = sys_llistxattr(fname, namebuf, namebuf_len); | |
145 | if (list_len >= 0) | |
146 | return list_len; | |
147 | } | |
148 | ||
149 | rsyserr(FERROR, errno, | |
150 | "get_xattr_names: llistxattr(\"%s\",%ld) failed", | |
151 | fname, (long)namebuf_len); | |
152 | return -1; | |
153 | } | |
154 | ||
155 | /* On entry, the *len_ptr parameter contains the size of the extra space we | |
156 | * should allocate when we create a buffer for the data. On exit, it contains | |
157 | * the length of the datum. */ | |
158 | static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr, | |
159 | int no_missing_error) | |
160 | { | |
161 | size_t datum_len = sys_lgetxattr(fname, name, NULL, 0); | |
162 | char *ptr; | |
163 | ||
164 | if (datum_len == (size_t)-1) { | |
165 | if (errno == ENOTSUP || no_missing_error) | |
166 | return NULL; | |
167 | rsyserr(FERROR, errno, | |
168 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed", | |
169 | fname, name); | |
170 | return NULL; | |
171 | } | |
172 | ||
173 | if (datum_len + *len_ptr < datum_len /* checks for overflow */ | |
174 | || !(ptr = new_array(char, datum_len + *len_ptr))) | |
175 | out_of_memory("get_xattr_data"); | |
176 | ||
177 | *len_ptr = datum_len; | |
178 | ||
179 | if (datum_len) { | |
180 | size_t len = sys_lgetxattr(fname, name, ptr, datum_len); | |
181 | if (len != datum_len) { | |
182 | if (len == (size_t)-1) { | |
183 | rsyserr(FERROR, errno, | |
184 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)" | |
185 | " failed", fname, name, (long)datum_len); | |
186 | } else { | |
187 | rprintf(FERROR, | |
188 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)" | |
189 | " returned %ld\n", fname, name, | |
190 | (long)datum_len, (long)len); | |
191 | } | |
192 | free(ptr); | |
193 | return NULL; | |
194 | } | |
195 | } | |
196 | ||
197 | return ptr; | |
198 | } | |
199 | ||
200 | static int rsync_xal_get(const char *fname, item_list *xalp) | |
201 | { | |
202 | ssize_t list_len, name_len; | |
203 | size_t datum_len, name_offset; | |
204 | char *name, *ptr; | |
205 | #ifdef HAVE_LINUX_XATTRS | |
206 | int user_only = am_sender ? 0 : !am_root; | |
207 | #endif | |
208 | ||
209 | /* This puts the name list into the "namebuf" buffer. */ | |
210 | if ((list_len = get_xattr_names(fname)) < 0) | |
211 | return -1; | |
212 | ||
213 | for (name = namebuf; list_len > 0; name += name_len) { | |
214 | rsync_xa *rxas; | |
215 | ||
216 | name_len = strlen(name) + 1; | |
217 | list_len -= name_len; | |
218 | ||
219 | #ifdef HAVE_LINUX_XATTRS | |
220 | /* We always ignore the system namespace, and non-root | |
221 | * ignores everything but the user namespace. */ | |
222 | if (user_only ? !HAS_PREFIX(name, USER_PREFIX) | |
223 | : HAS_PREFIX(name, SYSTEM_PREFIX)) | |
224 | continue; | |
225 | #endif | |
226 | ||
524eaa82 WD |
227 | /* No rsync.%FOO attributes are copied w/o 2 -X options. */ |
228 | if (preserve_xattrs < 2 && name_len > RPRE_LEN | |
229 | && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) | |
9439c0cb WD |
230 | continue; |
231 | ||
16edf865 WD |
232 | datum_len = name_len; /* Pass extra size to get_xattr_data() */ |
233 | if (!(ptr = get_xattr_data(fname, name, &datum_len, 0))) | |
234 | return -1; | |
235 | ||
236 | if (datum_len > MAX_FULL_DATUM) { | |
237 | /* For large datums, we store a flag and a checksum. */ | |
238 | name_offset = 1 + MAX_DIGEST_LEN; | |
239 | sum_init(checksum_seed); | |
240 | sum_update(ptr, datum_len); | |
241 | free(ptr); | |
242 | ||
243 | if (!(ptr = new_array(char, name_offset + name_len))) | |
244 | out_of_memory("rsync_xal_get"); | |
245 | *ptr = XSTATE_ABBREV; | |
246 | sum_end(ptr + 1); | |
247 | } else | |
248 | name_offset = datum_len; | |
249 | ||
9439c0cb WD |
250 | #ifdef HAVE_LINUX_XATTRS |
251 | if (am_root < 0 && name_len > RPRE_LEN | |
252 | && HAS_PREFIX(name, RSYNC_PREFIX)) { | |
253 | name += RPRE_LEN; | |
254 | name_len -= RPRE_LEN; | |
255 | } | |
256 | #endif | |
257 | ||
16edf865 WD |
258 | rxas = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL); |
259 | rxas->name = ptr + name_offset; | |
260 | memcpy(rxas->name, name, name_len); | |
261 | rxas->datum = ptr; | |
262 | rxas->name_len = name_len; | |
263 | rxas->datum_len = datum_len; | |
264 | } | |
265 | if (xalp->count > 1) | |
266 | qsort(xalp->items, xalp->count, sizeof (rsync_xa), rsync_xal_compare_names); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | /* Read the xattr(s) for this filename. */ | |
271 | int get_xattr(const char *fname, statx *sxp) | |
272 | { | |
273 | sxp->xattr = new(item_list); | |
274 | *sxp->xattr = empty_xattr; | |
275 | if (rsync_xal_get(fname, sxp->xattr) < 0) { | |
276 | free_xattr(sxp); | |
277 | return -1; | |
278 | } | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int find_matching_xattr(item_list *xalp) | |
283 | { | |
284 | size_t i, j; | |
285 | item_list *lst = rsync_xal_l.items; | |
286 | ||
287 | for (i = 0; i < rsync_xal_l.count; i++) { | |
288 | rsync_xa *rxas1 = lst[i].items; | |
289 | rsync_xa *rxas2 = xalp->items; | |
290 | ||
291 | /* Wrong number of elements? */ | |
292 | if (lst[i].count != xalp->count) | |
293 | continue; | |
294 | /* any elements different? */ | |
295 | for (j = 0; j < xalp->count; j++) { | |
296 | if (rxas1[j].name_len != rxas2[j].name_len | |
297 | || rxas1[j].datum_len != rxas2[j].datum_len | |
298 | || strcmp(rxas1[j].name, rxas2[j].name)) | |
299 | break; | |
300 | if (rxas1[j].datum_len > MAX_FULL_DATUM) { | |
301 | if (memcmp(rxas1[j].datum + 1, | |
302 | rxas2[j].datum + 1, | |
303 | MAX_DIGEST_LEN) != 0) | |
304 | break; | |
305 | } else { | |
306 | if (memcmp(rxas1[j].datum, rxas2[j].datum, | |
307 | rxas2[j].datum_len)) | |
308 | break; | |
309 | } | |
310 | } | |
311 | /* no differences found. This is The One! */ | |
312 | if (j == xalp->count) | |
313 | return i; | |
314 | } | |
315 | ||
316 | return -1; | |
317 | } | |
318 | ||
319 | /* Store *xalp on the end of rsync_xal_l */ | |
320 | static void rsync_xal_store(item_list *xalp) | |
321 | { | |
322 | item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL); | |
323 | /* Since the following call starts a new list, we know it will hold the | |
324 | * entire initial-count, not just enough space for one new item. */ | |
325 | *new_lst = empty_xattr; | |
326 | (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count); | |
327 | memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa)); | |
328 | new_lst->count = xalp->count; | |
329 | xalp->count = 0; | |
330 | } | |
331 | ||
332 | /* Send the make_xattr()-generated xattr list for this flist entry. */ | |
333 | int send_xattr(statx *sxp, int f) | |
334 | { | |
335 | int ndx = find_matching_xattr(sxp->xattr); | |
336 | ||
337 | /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */ | |
f31514ad | 338 | write_varint(f, ndx + 1); |
16edf865 WD |
339 | |
340 | if (ndx < 0) { | |
341 | rsync_xa *rxa; | |
342 | int count = sxp->xattr->count; | |
f31514ad | 343 | write_varint(f, count); |
16edf865 WD |
344 | for (rxa = sxp->xattr->items; count--; rxa++) { |
345 | #ifdef HAVE_LINUX_XATTRS | |
f31514ad WD |
346 | write_varint(f, rxa->name_len); |
347 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
348 | write_buf(f, rxa->name, rxa->name_len); |
349 | #else | |
350 | /* We strip the rsync prefix from disguised namespaces | |
351 | * and put everything else in the user namespace. */ | |
352 | if (HAS_PREFIX(rxa->name, RSYNC_PREFIX) | |
353 | && rxa->name[RPRE_LEN] != '%') { | |
f31514ad WD |
354 | write_varint(f, rxa->name_len - RPRE_LEN); |
355 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
356 | write_buf(f, rxa->name + RPRE_LEN, rxa->name_len - RPRE_LEN); |
357 | } else { | |
f31514ad WD |
358 | write_varint(f, rxa->name_len + UPRE_LEN); |
359 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
360 | write_buf(f, USER_PREFIX, UPRE_LEN); |
361 | write_buf(f, rxa->name, rxa->name_len); | |
362 | } | |
363 | #endif | |
364 | if (rxa->datum_len > MAX_FULL_DATUM) | |
365 | write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN); | |
366 | else | |
367 | write_buf(f, rxa->datum, rxa->datum_len); | |
368 | } | |
369 | ndx = rsync_xal_l.count; /* pre-incremented count */ | |
370 | rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */ | |
371 | } | |
372 | ||
373 | return ndx; | |
374 | } | |
375 | ||
376 | /* Return a flag indicating if we need to change a file's xattrs. If | |
377 | * "find_all" is specified, also mark any abbreviated xattrs that we | |
378 | * need so that send_xattr_request() can tell the sender about them. */ | |
379 | int xattr_diff(struct file_struct *file, statx *sxp, int find_all) | |
380 | { | |
381 | item_list *lst = rsync_xal_l.items; | |
382 | rsync_xa *snd_rxa, *rec_rxa; | |
383 | int snd_cnt, rec_cnt; | |
384 | int cmp, same, xattrs_equal = 1; | |
385 | ||
386 | if (sxp && XATTR_READY(*sxp)) { | |
387 | rec_rxa = sxp->xattr->items; | |
388 | rec_cnt = sxp->xattr->count; | |
389 | } else { | |
390 | rec_rxa = NULL; | |
391 | rec_cnt = 0; | |
392 | } | |
393 | ||
394 | if (F_XATTR(file) >= 0) | |
395 | lst += F_XATTR(file); | |
396 | else | |
397 | lst = &empty_xattr; | |
398 | ||
399 | snd_rxa = lst->items; | |
400 | snd_cnt = lst->count; | |
401 | ||
402 | /* If the count of the sender's xattrs is different from our | |
403 | * (receiver's) xattrs, the lists are not the same. */ | |
404 | if (snd_cnt != rec_cnt) { | |
405 | if (!find_all) | |
406 | return 1; | |
407 | xattrs_equal = 0; | |
408 | } | |
409 | ||
410 | while (snd_cnt) { | |
411 | cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1; | |
412 | if (cmp > 0) | |
413 | same = 0; | |
414 | else if (snd_rxa->datum_len > MAX_FULL_DATUM) { | |
415 | same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len | |
416 | && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1, | |
417 | MAX_DIGEST_LEN) == 0; | |
418 | /* Flag unrequested items that we need. */ | |
419 | if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV) | |
420 | snd_rxa->datum[0] = XSTATE_TODO; | |
421 | } else { | |
422 | same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len | |
423 | && memcmp(snd_rxa->datum, rec_rxa->datum, | |
424 | snd_rxa->datum_len) == 0; | |
425 | } | |
426 | if (!same) { | |
427 | if (!find_all) | |
428 | return 1; | |
429 | xattrs_equal = 0; | |
430 | } | |
431 | ||
432 | if (cmp <= 0) { | |
433 | snd_rxa++; | |
434 | snd_cnt--; | |
435 | } | |
436 | if (cmp >= 0) { | |
437 | rec_rxa++; | |
438 | rec_cnt--; | |
439 | } | |
440 | } | |
441 | ||
442 | if (rec_cnt) | |
443 | xattrs_equal = 0; | |
444 | ||
445 | return !xattrs_equal; | |
446 | } | |
447 | ||
448 | /* When called by the generator with a NULL fname, this tells the sender | |
449 | * which abbreviated xattr values we need. When called by the sender | |
450 | * (with a non-NULL fname), we send all the extra xattr data it needs. */ | |
451 | void send_xattr_request(const char *fname, struct file_struct *file, int f_out) | |
452 | { | |
453 | item_list *lst = rsync_xal_l.items; | |
454 | int j, cnt, prior_req = -1; | |
455 | rsync_xa *rxa; | |
456 | ||
457 | lst += F_XATTR(file); | |
458 | cnt = lst->count; | |
459 | for (rxa = lst->items, j = 0; j < cnt; rxa++, j++) { | |
460 | if (rxa->datum_len <= MAX_FULL_DATUM) | |
461 | continue; | |
462 | switch (rxa->datum[0]) { | |
463 | case XSTATE_LOCAL: | |
464 | /* Items set locally will get cached by receiver. */ | |
465 | rxa->datum[0] = XSTATE_DONE; | |
466 | continue; | |
467 | case XSTATE_TODO: | |
468 | break; | |
469 | default: | |
470 | continue; | |
471 | } | |
472 | ||
473 | /* Flag that we handled this abbreviated item. */ | |
474 | rxa->datum[0] = XSTATE_DONE; | |
475 | ||
f31514ad | 476 | write_varint(f_out, j - prior_req); |
16edf865 WD |
477 | prior_req = j; |
478 | ||
479 | if (fname) { | |
480 | size_t len = 0; | |
481 | char *ptr; | |
482 | ||
483 | /* Re-read the long datum. */ | |
484 | if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) | |
485 | continue; | |
486 | ||
f31514ad | 487 | write_varint(f_out, len); /* length might have changed! */ |
16edf865 WD |
488 | write_buf(f_out, ptr, len); |
489 | free(ptr); | |
490 | } | |
491 | } | |
492 | ||
493 | write_byte(f_out, 0); /* end the list */ | |
494 | } | |
495 | ||
496 | /* Any items set locally by the generator that the receiver doesn't | |
497 | * get told about get changed back to XSTATE_ABBREV. */ | |
498 | void xattr_clear_locals(struct file_struct *file) | |
499 | { | |
500 | item_list *lst = rsync_xal_l.items; | |
501 | rsync_xa *rxa; | |
502 | int cnt; | |
503 | ||
504 | if (F_XATTR(file) < 0) | |
505 | return; | |
506 | ||
507 | lst += F_XATTR(file); | |
508 | cnt = lst->count; | |
509 | for (rxa = lst->items; cnt--; rxa++) { | |
510 | if (rxa->datum_len <= MAX_FULL_DATUM) | |
511 | continue; | |
512 | if (rxa->datum[0] == XSTATE_LOCAL) | |
513 | rxa->datum[0] = XSTATE_ABBREV; | |
514 | } | |
515 | } | |
516 | ||
517 | /* When called by the sender, read the request from the generator and mark | |
518 | * any needed xattrs with a flag that lets us know they need to be sent to | |
519 | * the receiver. When called by the receiver, reads the sent data and | |
520 | * stores it in place of its checksum. */ | |
521 | void recv_xattr_request(struct file_struct *file, int f_in) | |
522 | { | |
523 | item_list *lst = rsync_xal_l.items; | |
524 | char *old_datum, *name; | |
525 | rsync_xa *rxa; | |
526 | int rel_pos, cnt; | |
527 | ||
528 | if (F_XATTR(file) < 0) { | |
529 | rprintf(FERROR, "recv_xattr_request: internal data error!\n"); | |
530 | exit_cleanup(RERR_STREAMIO); | |
531 | } | |
532 | lst += F_XATTR(file); | |
533 | ||
534 | cnt = lst->count; | |
535 | rxa = lst->items; | |
536 | rxa -= 1; | |
f31514ad | 537 | while ((rel_pos = read_varint(f_in)) != 0) { |
16edf865 WD |
538 | rxa += rel_pos; |
539 | cnt -= rel_pos; | |
540 | if (cnt < 0 || rxa->datum_len <= MAX_FULL_DATUM | |
541 | || rxa->datum[0] != XSTATE_ABBREV) { | |
542 | rprintf(FERROR, "recv_xattr_request: internal abbrev error!\n"); | |
543 | exit_cleanup(RERR_STREAMIO); | |
544 | } | |
545 | ||
546 | if (am_sender) { | |
547 | rxa->datum[0] = XSTATE_TODO; | |
548 | continue; | |
549 | } | |
550 | ||
551 | old_datum = rxa->datum; | |
f31514ad | 552 | rxa->datum_len = read_varint(f_in); |
16edf865 WD |
553 | |
554 | if (rxa->name_len + rxa->datum_len < rxa->name_len) | |
555 | out_of_memory("recv_xattr_request"); /* overflow */ | |
556 | rxa->datum = new_array(char, rxa->datum_len + rxa->name_len); | |
557 | if (!rxa->datum) | |
558 | out_of_memory("recv_xattr_request"); | |
559 | name = rxa->datum + rxa->datum_len; | |
560 | memcpy(name, rxa->name, rxa->name_len); | |
561 | rxa->name = name; | |
562 | free(old_datum); | |
563 | read_buf(f_in, rxa->datum, rxa->datum_len); | |
564 | } | |
565 | } | |
566 | ||
567 | /* ------------------------------------------------------------------------- */ | |
568 | ||
569 | /* receive and build the rsync_xattr_lists */ | |
570 | void receive_xattr(struct file_struct *file, int f) | |
571 | { | |
572 | static item_list temp_xattr = EMPTY_ITEM_LIST; | |
573 | int count; | |
f31514ad | 574 | int ndx = read_varint(f); |
16edf865 WD |
575 | |
576 | if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) { | |
577 | rprintf(FERROR, "receive_xattr: xa index %d out of" | |
578 | " range for %s\n", ndx, f_name(file, NULL)); | |
579 | exit_cleanup(RERR_STREAMIO); | |
580 | } | |
581 | ||
582 | if (ndx != 0) { | |
583 | F_XATTR(file) = ndx - 1; | |
584 | return; | |
585 | } | |
586 | ||
f31514ad | 587 | if ((count = read_varint(f)) != 0) { |
16edf865 WD |
588 | (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count); |
589 | temp_xattr.count = 0; | |
590 | } | |
591 | ||
592 | while (count--) { | |
593 | char *ptr, *name; | |
594 | rsync_xa *rxa; | |
f31514ad WD |
595 | size_t name_len = read_varint(f); |
596 | size_t datum_len = read_varint(f); | |
16edf865 | 597 | size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len; |
9439c0cb | 598 | size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0; |
16edf865 WD |
599 | if (dget_len + extra_len < dget_len) |
600 | out_of_memory("receive_xattr"); /* overflow */ | |
16edf865 WD |
601 | if (dget_len + extra_len + name_len < dget_len) |
602 | out_of_memory("receive_xattr"); /* overflow */ | |
603 | ptr = new_array(char, dget_len + extra_len + name_len); | |
604 | if (!ptr) | |
605 | out_of_memory("receive_xattr"); | |
606 | name = ptr + dget_len + extra_len; | |
607 | read_buf(f, name, name_len); | |
608 | if (dget_len == datum_len) | |
609 | read_buf(f, ptr, dget_len); | |
610 | else { | |
611 | *ptr = XSTATE_ABBREV; | |
612 | read_buf(f, ptr + 1, MAX_DIGEST_LEN); | |
613 | } | |
614 | #ifdef HAVE_LINUX_XATTRS | |
615 | /* Non-root can only save the user namespace. */ | |
9439c0cb WD |
616 | if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) { |
617 | if (!am_root) { | |
618 | free(ptr); | |
619 | continue; | |
620 | } | |
621 | name -= RPRE_LEN; | |
622 | name_len += RPRE_LEN; | |
623 | memcpy(name, RSYNC_PREFIX, RPRE_LEN); | |
16edf865 WD |
624 | } |
625 | #else | |
626 | /* This OS only has a user namespace, so we either | |
627 | * strip the user prefix, or we put a non-user | |
628 | * namespace inside our rsync hierarchy. */ | |
629 | if (HAS_PREFIX(name, USER_PREFIX)) { | |
630 | name += UPRE_LEN; | |
631 | name_len -= UPRE_LEN; | |
632 | } else if (am_root) { | |
633 | name -= RPRE_LEN; | |
634 | name_len += RPRE_LEN; | |
635 | memcpy(name, RSYNC_PREFIX, RPRE_LEN); | |
636 | } else { | |
637 | free(ptr); | |
638 | continue; | |
639 | } | |
640 | #endif | |
524eaa82 WD |
641 | /* No rsync.%FOO attributes are copied w/o 2 -X options. */ |
642 | if (preserve_xattrs < 2 && name_len > RPRE_LEN | |
643 | && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) { | |
9439c0cb WD |
644 | free(ptr); |
645 | continue; | |
646 | } | |
16edf865 WD |
647 | rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1); |
648 | rxa->name = name; | |
649 | rxa->datum = ptr; | |
650 | rxa->name_len = name_len; | |
651 | rxa->datum_len = datum_len; | |
652 | } | |
653 | ||
654 | ndx = rsync_xal_l.count; /* pre-incremented count */ | |
655 | rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */ | |
656 | ||
657 | F_XATTR(file) = ndx; | |
658 | } | |
659 | ||
660 | /* Turn the xattr data in statx into cached xattr data, setting the index | |
661 | * values in the file struct. */ | |
662 | void cache_xattr(struct file_struct *file, statx *sxp) | |
663 | { | |
664 | int ndx; | |
665 | ||
666 | if (!sxp->xattr) | |
667 | return; | |
668 | ||
669 | ndx = find_matching_xattr(sxp->xattr); | |
670 | if (ndx < 0) | |
671 | rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */ | |
672 | ||
673 | F_XATTR(file) = ndx; | |
674 | } | |
675 | ||
676 | static int rsync_xal_set(const char *fname, item_list *xalp, | |
677 | const char *fnamecmp, statx *sxp) | |
678 | { | |
679 | rsync_xa *rxas = xalp->items; | |
680 | ssize_t list_len; | |
681 | size_t i, len; | |
682 | char *name, *ptr, sum[MAX_DIGEST_LEN]; | |
683 | int name_len, ret = 0; | |
684 | ||
685 | /* This puts the current name list into the "namebuf" buffer. */ | |
686 | if ((list_len = get_xattr_names(fname)) < 0) | |
687 | return -1; | |
688 | ||
689 | for (i = 0; i < xalp->count; i++) { | |
690 | name = rxas[i].name; | |
691 | ||
692 | if (XATTR_ABBREV(rxas[i])) { | |
693 | /* See if the fnamecmp version is identical. */ | |
694 | len = name_len = rxas[i].name_len; | |
695 | if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) { | |
696 | still_abbrev: | |
697 | if (am_generator) | |
698 | continue; | |
699 | rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n", | |
700 | rxas[i].name, full_fname(fname)); | |
701 | ret = -1; | |
702 | continue; | |
703 | } | |
704 | if (len != rxas[i].datum_len) { | |
705 | free(ptr); | |
706 | goto still_abbrev; | |
707 | } | |
708 | ||
709 | sum_init(checksum_seed); | |
710 | sum_update(ptr, len); | |
711 | sum_end(sum); | |
712 | if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) { | |
713 | free(ptr); | |
714 | goto still_abbrev; | |
715 | } | |
716 | ||
717 | if (fname == fnamecmp) | |
718 | ; /* Value is already set when identical */ | |
719 | else if (sys_lsetxattr(fname, name, ptr, len) < 0) { | |
720 | rsyserr(FERROR, errno, | |
721 | "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed", | |
722 | fname, name); | |
723 | ret = -1; | |
724 | } else /* make sure caller sets mtime */ | |
725 | sxp->st.st_mtime = (time_t)-1; | |
726 | ||
727 | if (am_generator) { /* generator items stay abbreviated */ | |
728 | if (rxas[i].datum[0] == XSTATE_ABBREV) | |
729 | rxas[i].datum[0] = XSTATE_LOCAL; | |
730 | free(ptr); | |
731 | continue; | |
732 | } | |
733 | ||
734 | memcpy(ptr + len, name, name_len); | |
735 | free(rxas[i].datum); | |
736 | ||
737 | rxas[i].name = name = ptr + len; | |
738 | rxas[i].datum = ptr; | |
739 | continue; | |
740 | } | |
741 | ||
742 | if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) { | |
743 | rsyserr(FERROR, errno, | |
744 | "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed", | |
745 | fname, name); | |
746 | ret = -1; | |
747 | } else /* make sure caller sets mtime */ | |
748 | sxp->st.st_mtime = (time_t)-1; | |
749 | } | |
750 | ||
751 | /* Remove any extraneous names. */ | |
752 | for (name = namebuf; list_len > 0; name += name_len) { | |
753 | name_len = strlen(name) + 1; | |
754 | list_len -= name_len; | |
755 | ||
756 | #ifdef HAVE_LINUX_XATTRS | |
757 | /* We always ignore the system namespace, and non-root | |
758 | * ignores everything but the user namespace. */ | |
759 | if (am_root ? HAS_PREFIX(name, SYSTEM_PREFIX) | |
760 | : !HAS_PREFIX(name, USER_PREFIX)) | |
761 | continue; | |
762 | #endif | |
763 | ||
764 | for (i = 0; i < xalp->count; i++) { | |
765 | if (strcmp(name, rxas[i].name) == 0) | |
766 | break; | |
767 | } | |
768 | if (i == xalp->count) { | |
769 | if (sys_lremovexattr(fname, name) < 0) { | |
770 | rsyserr(FERROR, errno, | |
771 | "rsync_xal_clear: lremovexattr(\"%s\",\"%s\") failed", | |
772 | fname, name); | |
773 | ret = -1; | |
774 | } else /* make sure caller sets mtime */ | |
775 | sxp->st.st_mtime = (time_t)-1; | |
776 | } | |
777 | } | |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
782 | /* Set extended attributes on indicated filename. */ | |
783 | int set_xattr(const char *fname, const struct file_struct *file, | |
784 | const char *fnamecmp, statx *sxp) | |
785 | { | |
786 | int ndx; | |
787 | item_list *lst = rsync_xal_l.items; | |
788 | ||
789 | if (dry_run) | |
790 | return 1; /* FIXME: --dry-run needs to compute this value */ | |
791 | ||
792 | if (read_only || list_only) { | |
793 | errno = EROFS; | |
794 | return -1; | |
795 | } | |
796 | ||
797 | ndx = F_XATTR(file); | |
798 | return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp); | |
799 | } | |
800 | ||
9439c0cb WD |
801 | int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst) |
802 | { | |
803 | int mode, rdev_major, rdev_minor, uid, gid, len; | |
804 | char buf[256]; | |
805 | ||
806 | if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode)) | |
807 | return -1; | |
808 | ||
809 | if (xst) | |
810 | *xst = *fst; | |
811 | else | |
812 | xst = fst; | |
813 | if (fname) { | |
814 | fd = -1; | |
815 | len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1); | |
816 | } else { | |
817 | fname = "fd"; | |
818 | len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1); | |
819 | } | |
820 | if (len >= (int)sizeof buf) { | |
821 | len = -1; | |
822 | errno = ERANGE; | |
823 | } | |
824 | if (len < 0) { | |
825 | if (errno == ENOTSUP || errno == ENOATTR) | |
826 | return -1; | |
827 | if (errno == EPERM && S_ISLNK(fst->st_mode)) { | |
828 | xst->st_uid = 0; | |
829 | xst->st_gid = 0; | |
830 | return 0; | |
831 | } | |
832 | rsyserr(FERROR, errno, "failed to read xattr %s for %s", | |
833 | XSTAT_ATTR, full_fname(fname)); | |
834 | return -1; | |
835 | } | |
836 | buf[len] = '\0'; | |
837 | ||
838 | if (sscanf(buf, "%o %d,%d %d:%d", | |
839 | &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) { | |
840 | rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n", | |
841 | XSTAT_ATTR, full_fname(fname), buf); | |
842 | exit_cleanup(RERR_FILEIO); | |
843 | } | |
844 | ||
845 | xst->st_mode = from_wire_mode(mode); | |
846 | xst->st_rdev = MAKEDEV(rdev_major, rdev_minor); | |
847 | xst->st_uid = uid; | |
848 | xst->st_gid = gid; | |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
853 | int set_stat_xattr(const char *fname, struct file_struct *file) | |
854 | { | |
855 | STRUCT_STAT fst, xst; | |
856 | dev_t rdev; | |
857 | mode_t mode, fmode; | |
858 | ||
859 | if (dry_run) | |
860 | return 0; | |
861 | ||
862 | if (read_only || list_only) { | |
863 | rsyserr(FERROR, EROFS, "failed to write xattr %s for %s", | |
864 | XSTAT_ATTR, full_fname(fname)); | |
865 | return -1; | |
866 | } | |
867 | ||
868 | if (x_lstat(fname, &fst, &xst) < 0) { | |
869 | rsyserr(FERROR, errno, "failed to re-stat %s", | |
870 | full_fname(fname)); | |
871 | return -1; | |
872 | } | |
873 | ||
874 | fst.st_mode &= (_S_IFMT | CHMOD_BITS); | |
875 | fmode = file->mode & (_S_IFMT | CHMOD_BITS); | |
876 | ||
877 | if (IS_DEVICE(fmode) || IS_SPECIAL(fmode)) { | |
878 | uint32 *devp = F_RDEV_P(file); | |
879 | rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)); | |
880 | } else | |
881 | rdev = 0; | |
882 | ||
883 | /* Dump the special permissions and enable full owner access. */ | |
884 | mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS) | |
885 | | (S_ISDIR(fst.st_mode) ? 0700 : 0600); | |
886 | if (fst.st_mode != mode) | |
887 | do_chmod(fname, mode); | |
888 | if (!IS_DEVICE(fst.st_mode) && !IS_SPECIAL(fst.st_mode)) | |
889 | fst.st_rdev = 0; /* just in case */ | |
890 | ||
891 | if (mode == fmode && fst.st_rdev == rdev | |
fb7b9ddc | 892 | && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) { |
9439c0cb WD |
893 | /* xst.st_mode will be 0 if there's no current stat xattr */ |
894 | if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) { | |
895 | rsyserr(FERROR, errno, | |
896 | "delete of stat xattr failed for %s", | |
897 | full_fname(fname)); | |
898 | return -1; | |
899 | } | |
900 | return 0; | |
901 | } | |
902 | ||
903 | if (xst.st_mode != fmode || xst.st_rdev != rdev | |
fb7b9ddc | 904 | || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) { |
9439c0cb WD |
905 | char buf[256]; |
906 | int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u", | |
907 | to_wire_mode(fmode), | |
908 | (int)major(rdev), (int)minor(rdev), | |
fb7b9ddc | 909 | F_OWNER(file), F_GROUP(file)); |
9439c0cb WD |
910 | if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) { |
911 | if (errno == EPERM && S_ISLNK(fst.st_mode)) | |
912 | return 0; | |
913 | rsyserr(FERROR, errno, | |
914 | "failed to write xattr %s for %s", | |
915 | XSTAT_ATTR, full_fname(fname)); | |
916 | return -1; | |
917 | } | |
918 | } | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
924 | { | |
925 | int ret = do_stat(fname, fst); | |
926 | if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst) | |
927 | xst->st_mode = 0; | |
928 | return ret; | |
929 | } | |
930 | ||
931 | int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
932 | { | |
933 | int ret = do_lstat(fname, fst); | |
934 | if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst) | |
935 | xst->st_mode = 0; | |
936 | return ret; | |
937 | } | |
938 | ||
939 | int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
940 | { | |
941 | int ret = do_fstat(fd, fst); | |
942 | if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst) | |
943 | xst->st_mode = 0; | |
944 | return ret; | |
945 | } | |
946 | ||
16edf865 | 947 | #endif /* SUPPORT_XATTRS */ |