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 | |
16edf865 WD |
50 | |
51 | #define USER_PREFIX "user." | |
52 | #define UPRE_LEN ((int)sizeof USER_PREFIX - 1) | |
53 | #define SYSTEM_PREFIX "system." | |
54 | #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1) | |
55 | ||
56 | #ifdef HAVE_LINUX_XATTRS | |
9439c0cb WD |
57 | #define MIGHT_NEED_RPRE (am_root < 0) |
58 | #define RSYNC_PREFIX USER_PREFIX "rsync." | |
16edf865 | 59 | #else |
9439c0cb | 60 | #define MIGHT_NEED_RPRE am_root |
16edf865 | 61 | #define RSYNC_PREFIX "rsync." |
16edf865 | 62 | #endif |
9439c0cb WD |
63 | #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1) |
64 | ||
65 | #define XSTAT_ATTR RSYNC_PREFIX "%stat" | |
7ed6bc53 WD |
66 | #define XACC_ACL_ATTR RSYNC_PREFIX "%aacl" |
67 | #define XDEF_ACL_ATTR RSYNC_PREFIX "%dacl" | |
16edf865 WD |
68 | |
69 | typedef struct { | |
70 | char *datum, *name; | |
71 | size_t datum_len, name_len; | |
68ddbaf6 | 72 | int num; |
16edf865 WD |
73 | } rsync_xa; |
74 | ||
75 | static size_t namebuf_len = 0; | |
76 | static char *namebuf = NULL; | |
77 | ||
78 | static item_list empty_xattr = EMPTY_ITEM_LIST; | |
79 | static item_list rsync_xal_l = EMPTY_ITEM_LIST; | |
80 | ||
81 | /* ------------------------------------------------------------------------- */ | |
82 | ||
83 | static void rsync_xal_free(item_list *xalp) | |
84 | { | |
85 | size_t i; | |
86 | rsync_xa *rxas = xalp->items; | |
87 | ||
88 | for (i = 0; i < xalp->count; i++) { | |
89 | free(rxas[i].datum); | |
90 | /*free(rxas[i].name);*/ | |
91 | } | |
92 | xalp->count = 0; | |
93 | } | |
94 | ||
13710874 | 95 | void free_xattr(stat_x *sxp) |
16edf865 WD |
96 | { |
97 | if (!sxp->xattr) | |
98 | return; | |
99 | rsync_xal_free(sxp->xattr); | |
100 | free(sxp->xattr); | |
101 | sxp->xattr = NULL; | |
102 | } | |
103 | ||
104 | static int rsync_xal_compare_names(const void *x1, const void *x2) | |
105 | { | |
106 | const rsync_xa *xa1 = x1; | |
107 | const rsync_xa *xa2 = x2; | |
108 | return strcmp(xa1->name, xa2->name); | |
109 | } | |
110 | ||
111 | static ssize_t get_xattr_names(const char *fname) | |
112 | { | |
113 | ssize_t list_len; | |
114 | ||
115 | if (!namebuf) { | |
116 | namebuf_len = 1024; | |
117 | namebuf = new_array(char, namebuf_len); | |
118 | if (!namebuf) | |
119 | out_of_memory("get_xattr_names"); | |
120 | } | |
121 | ||
122 | /* The length returned includes all the '\0' terminators. */ | |
123 | list_len = sys_llistxattr(fname, namebuf, namebuf_len); | |
124 | if (list_len > (ssize_t)namebuf_len) { | |
125 | list_len = -1; | |
126 | errno = ERANGE; | |
127 | } | |
128 | if (list_len >= 0) | |
129 | return list_len; | |
130 | if (errno == ENOTSUP) | |
131 | return 0; | |
132 | if (errno == ERANGE) { | |
133 | list_len = sys_llistxattr(fname, NULL, 0); | |
134 | if (list_len < 0) { | |
3f0211b6 | 135 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
136 | "get_xattr_names: llistxattr(\"%s\",0) failed", |
137 | fname); | |
138 | return -1; | |
139 | } | |
140 | if (namebuf_len) | |
141 | free(namebuf); | |
142 | namebuf_len = list_len + 1024; | |
143 | namebuf = new_array(char, namebuf_len); | |
144 | if (!namebuf) | |
145 | out_of_memory("get_xattr_names"); | |
146 | list_len = sys_llistxattr(fname, namebuf, namebuf_len); | |
147 | if (list_len >= 0) | |
148 | return list_len; | |
149 | } | |
150 | ||
3f0211b6 | 151 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
152 | "get_xattr_names: llistxattr(\"%s\",%ld) failed", |
153 | fname, (long)namebuf_len); | |
154 | return -1; | |
155 | } | |
156 | ||
157 | /* On entry, the *len_ptr parameter contains the size of the extra space we | |
158 | * should allocate when we create a buffer for the data. On exit, it contains | |
159 | * the length of the datum. */ | |
160 | static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr, | |
161 | int no_missing_error) | |
162 | { | |
163 | size_t datum_len = sys_lgetxattr(fname, name, NULL, 0); | |
41979f25 | 164 | size_t extra_len = *len_ptr; |
16edf865 WD |
165 | char *ptr; |
166 | ||
41979f25 WD |
167 | *len_ptr = datum_len; |
168 | ||
16edf865 WD |
169 | if (datum_len == (size_t)-1) { |
170 | if (errno == ENOTSUP || no_missing_error) | |
171 | return NULL; | |
3f0211b6 | 172 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
173 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed", |
174 | fname, name); | |
175 | return NULL; | |
176 | } | |
177 | ||
41979f25 WD |
178 | if (!datum_len && !extra_len) |
179 | extra_len = 1; /* request non-zero amount of memory */ | |
180 | if (datum_len + extra_len < datum_len /* checks for overflow */ | |
181 | || !(ptr = new_array(char, datum_len + extra_len))) | |
16edf865 WD |
182 | out_of_memory("get_xattr_data"); |
183 | ||
16edf865 WD |
184 | if (datum_len) { |
185 | size_t len = sys_lgetxattr(fname, name, ptr, datum_len); | |
186 | if (len != datum_len) { | |
187 | if (len == (size_t)-1) { | |
3f0211b6 | 188 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
189 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)" |
190 | " failed", fname, name, (long)datum_len); | |
191 | } else { | |
3f0211b6 | 192 | rprintf(FERROR_XFER, |
16edf865 WD |
193 | "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)" |
194 | " returned %ld\n", fname, name, | |
195 | (long)datum_len, (long)len); | |
196 | } | |
197 | free(ptr); | |
198 | return NULL; | |
199 | } | |
200 | } | |
201 | ||
202 | return ptr; | |
203 | } | |
204 | ||
205 | static int rsync_xal_get(const char *fname, item_list *xalp) | |
206 | { | |
207 | ssize_t list_len, name_len; | |
208 | size_t datum_len, name_offset; | |
209 | char *name, *ptr; | |
210 | #ifdef HAVE_LINUX_XATTRS | |
211 | int user_only = am_sender ? 0 : !am_root; | |
212 | #endif | |
68ddbaf6 WD |
213 | rsync_xa *rxa; |
214 | int count; | |
16edf865 WD |
215 | |
216 | /* This puts the name list into the "namebuf" buffer. */ | |
217 | if ((list_len = get_xattr_names(fname)) < 0) | |
218 | return -1; | |
219 | ||
220 | for (name = namebuf; list_len > 0; name += name_len) { | |
16edf865 WD |
221 | name_len = strlen(name) + 1; |
222 | list_len -= name_len; | |
223 | ||
224 | #ifdef HAVE_LINUX_XATTRS | |
225 | /* We always ignore the system namespace, and non-root | |
226 | * ignores everything but the user namespace. */ | |
227 | if (user_only ? !HAS_PREFIX(name, USER_PREFIX) | |
228 | : HAS_PREFIX(name, SYSTEM_PREFIX)) | |
229 | continue; | |
230 | #endif | |
231 | ||
524eaa82 | 232 | /* No rsync.%FOO attributes are copied w/o 2 -X options. */ |
a685271d WD |
233 | if (name_len > RPRE_LEN && name[RPRE_LEN] == '%' |
234 | && HAS_PREFIX(name, RSYNC_PREFIX)) { | |
235 | if ((am_sender && preserve_xattrs < 2) | |
236 | || (am_root < 0 && strcmp(name, XSTAT_ATTR) == 0)) | |
237 | continue; | |
238 | } | |
9439c0cb | 239 | |
16edf865 WD |
240 | datum_len = name_len; /* Pass extra size to get_xattr_data() */ |
241 | if (!(ptr = get_xattr_data(fname, name, &datum_len, 0))) | |
242 | return -1; | |
243 | ||
244 | if (datum_len > MAX_FULL_DATUM) { | |
245 | /* For large datums, we store a flag and a checksum. */ | |
246 | name_offset = 1 + MAX_DIGEST_LEN; | |
247 | sum_init(checksum_seed); | |
248 | sum_update(ptr, datum_len); | |
249 | free(ptr); | |
250 | ||
251 | if (!(ptr = new_array(char, name_offset + name_len))) | |
252 | out_of_memory("rsync_xal_get"); | |
253 | *ptr = XSTATE_ABBREV; | |
254 | sum_end(ptr + 1); | |
255 | } else | |
256 | name_offset = datum_len; | |
257 | ||
9439c0cb | 258 | #ifdef HAVE_LINUX_XATTRS |
a685271d | 259 | if (am_root < 0 && name_len > RPRE_LEN && name[RPRE_LEN] != '%' |
9439c0cb WD |
260 | && HAS_PREFIX(name, RSYNC_PREFIX)) { |
261 | name += RPRE_LEN; | |
262 | name_len -= RPRE_LEN; | |
263 | } | |
264 | #endif | |
265 | ||
a685271d WD |
266 | rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL); |
267 | rxa->name = ptr + name_offset; | |
268 | memcpy(rxa->name, name, name_len); | |
269 | rxa->datum = ptr; | |
270 | rxa->name_len = name_len; | |
271 | rxa->datum_len = datum_len; | |
16edf865 | 272 | } |
68ddbaf6 WD |
273 | count = xalp->count; |
274 | rxa = xalp->items; | |
275 | if (count > 1) | |
276 | qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names); | |
277 | for (rxa += count-1; count; count--, rxa--) | |
278 | rxa->num = count; | |
16edf865 WD |
279 | return 0; |
280 | } | |
281 | ||
282 | /* Read the xattr(s) for this filename. */ | |
13710874 | 283 | int get_xattr(const char *fname, stat_x *sxp) |
16edf865 WD |
284 | { |
285 | sxp->xattr = new(item_list); | |
286 | *sxp->xattr = empty_xattr; | |
287 | if (rsync_xal_get(fname, sxp->xattr) < 0) { | |
288 | free_xattr(sxp); | |
289 | return -1; | |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static int find_matching_xattr(item_list *xalp) | |
295 | { | |
296 | size_t i, j; | |
297 | item_list *lst = rsync_xal_l.items; | |
298 | ||
299 | for (i = 0; i < rsync_xal_l.count; i++) { | |
300 | rsync_xa *rxas1 = lst[i].items; | |
301 | rsync_xa *rxas2 = xalp->items; | |
302 | ||
303 | /* Wrong number of elements? */ | |
304 | if (lst[i].count != xalp->count) | |
305 | continue; | |
306 | /* any elements different? */ | |
307 | for (j = 0; j < xalp->count; j++) { | |
308 | if (rxas1[j].name_len != rxas2[j].name_len | |
309 | || rxas1[j].datum_len != rxas2[j].datum_len | |
310 | || strcmp(rxas1[j].name, rxas2[j].name)) | |
311 | break; | |
312 | if (rxas1[j].datum_len > MAX_FULL_DATUM) { | |
313 | if (memcmp(rxas1[j].datum + 1, | |
314 | rxas2[j].datum + 1, | |
315 | MAX_DIGEST_LEN) != 0) | |
316 | break; | |
317 | } else { | |
318 | if (memcmp(rxas1[j].datum, rxas2[j].datum, | |
319 | rxas2[j].datum_len)) | |
320 | break; | |
321 | } | |
322 | } | |
323 | /* no differences found. This is The One! */ | |
324 | if (j == xalp->count) | |
325 | return i; | |
326 | } | |
327 | ||
328 | return -1; | |
329 | } | |
330 | ||
331 | /* Store *xalp on the end of rsync_xal_l */ | |
332 | static void rsync_xal_store(item_list *xalp) | |
333 | { | |
334 | item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL); | |
335 | /* Since the following call starts a new list, we know it will hold the | |
336 | * entire initial-count, not just enough space for one new item. */ | |
337 | *new_lst = empty_xattr; | |
338 | (void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count); | |
339 | memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa)); | |
340 | new_lst->count = xalp->count; | |
341 | xalp->count = 0; | |
342 | } | |
343 | ||
344 | /* Send the make_xattr()-generated xattr list for this flist entry. */ | |
13710874 | 345 | int send_xattr(stat_x *sxp, int f) |
16edf865 WD |
346 | { |
347 | int ndx = find_matching_xattr(sxp->xattr); | |
348 | ||
349 | /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */ | |
f31514ad | 350 | write_varint(f, ndx + 1); |
16edf865 WD |
351 | |
352 | if (ndx < 0) { | |
353 | rsync_xa *rxa; | |
354 | int count = sxp->xattr->count; | |
f31514ad | 355 | write_varint(f, count); |
16edf865 WD |
356 | for (rxa = sxp->xattr->items; count--; rxa++) { |
357 | #ifdef HAVE_LINUX_XATTRS | |
f31514ad WD |
358 | write_varint(f, rxa->name_len); |
359 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
360 | write_buf(f, rxa->name, rxa->name_len); |
361 | #else | |
362 | /* We strip the rsync prefix from disguised namespaces | |
363 | * and put everything else in the user namespace. */ | |
364 | if (HAS_PREFIX(rxa->name, RSYNC_PREFIX) | |
365 | && rxa->name[RPRE_LEN] != '%') { | |
f31514ad WD |
366 | write_varint(f, rxa->name_len - RPRE_LEN); |
367 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
368 | write_buf(f, rxa->name + RPRE_LEN, rxa->name_len - RPRE_LEN); |
369 | } else { | |
f31514ad WD |
370 | write_varint(f, rxa->name_len + UPRE_LEN); |
371 | write_varint(f, rxa->datum_len); | |
16edf865 WD |
372 | write_buf(f, USER_PREFIX, UPRE_LEN); |
373 | write_buf(f, rxa->name, rxa->name_len); | |
374 | } | |
375 | #endif | |
376 | if (rxa->datum_len > MAX_FULL_DATUM) | |
377 | write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN); | |
378 | else | |
379 | write_buf(f, rxa->datum, rxa->datum_len); | |
380 | } | |
381 | ndx = rsync_xal_l.count; /* pre-incremented count */ | |
382 | rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */ | |
383 | } | |
384 | ||
385 | return ndx; | |
386 | } | |
387 | ||
388 | /* Return a flag indicating if we need to change a file's xattrs. If | |
389 | * "find_all" is specified, also mark any abbreviated xattrs that we | |
390 | * need so that send_xattr_request() can tell the sender about them. */ | |
13710874 | 391 | int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all) |
16edf865 WD |
392 | { |
393 | item_list *lst = rsync_xal_l.items; | |
394 | rsync_xa *snd_rxa, *rec_rxa; | |
395 | int snd_cnt, rec_cnt; | |
396 | int cmp, same, xattrs_equal = 1; | |
397 | ||
398 | if (sxp && XATTR_READY(*sxp)) { | |
399 | rec_rxa = sxp->xattr->items; | |
400 | rec_cnt = sxp->xattr->count; | |
401 | } else { | |
402 | rec_rxa = NULL; | |
403 | rec_cnt = 0; | |
404 | } | |
405 | ||
406 | if (F_XATTR(file) >= 0) | |
407 | lst += F_XATTR(file); | |
408 | else | |
409 | lst = &empty_xattr; | |
410 | ||
411 | snd_rxa = lst->items; | |
412 | snd_cnt = lst->count; | |
413 | ||
414 | /* If the count of the sender's xattrs is different from our | |
415 | * (receiver's) xattrs, the lists are not the same. */ | |
416 | if (snd_cnt != rec_cnt) { | |
417 | if (!find_all) | |
418 | return 1; | |
419 | xattrs_equal = 0; | |
420 | } | |
421 | ||
422 | while (snd_cnt) { | |
423 | cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1; | |
424 | if (cmp > 0) | |
425 | same = 0; | |
426 | else if (snd_rxa->datum_len > MAX_FULL_DATUM) { | |
427 | same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len | |
428 | && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1, | |
429 | MAX_DIGEST_LEN) == 0; | |
430 | /* Flag unrequested items that we need. */ | |
431 | if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV) | |
432 | snd_rxa->datum[0] = XSTATE_TODO; | |
433 | } else { | |
434 | same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len | |
435 | && memcmp(snd_rxa->datum, rec_rxa->datum, | |
436 | snd_rxa->datum_len) == 0; | |
437 | } | |
438 | if (!same) { | |
439 | if (!find_all) | |
440 | return 1; | |
441 | xattrs_equal = 0; | |
442 | } | |
443 | ||
444 | if (cmp <= 0) { | |
445 | snd_rxa++; | |
446 | snd_cnt--; | |
447 | } | |
448 | if (cmp >= 0) { | |
449 | rec_rxa++; | |
450 | rec_cnt--; | |
451 | } | |
452 | } | |
453 | ||
454 | if (rec_cnt) | |
455 | xattrs_equal = 0; | |
456 | ||
457 | return !xattrs_equal; | |
458 | } | |
459 | ||
460 | /* When called by the generator with a NULL fname, this tells the sender | |
461 | * which abbreviated xattr values we need. When called by the sender | |
462 | * (with a non-NULL fname), we send all the extra xattr data it needs. */ | |
463 | void send_xattr_request(const char *fname, struct file_struct *file, int f_out) | |
464 | { | |
465 | item_list *lst = rsync_xal_l.items; | |
68ddbaf6 | 466 | int cnt, prior_req = 0; |
16edf865 WD |
467 | rsync_xa *rxa; |
468 | ||
469 | lst += F_XATTR(file); | |
68ddbaf6 | 470 | for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) { |
16edf865 WD |
471 | if (rxa->datum_len <= MAX_FULL_DATUM) |
472 | continue; | |
473 | switch (rxa->datum[0]) { | |
b769ad6a WD |
474 | case XSTATE_ABBREV: |
475 | /* Items left abbreviated matched the sender's checksum, so | |
476 | * the receiver will cache the local data for future use. */ | |
477 | if (am_generator) | |
478 | rxa->datum[0] = XSTATE_DONE; | |
16edf865 WD |
479 | continue; |
480 | case XSTATE_TODO: | |
481 | break; | |
482 | default: | |
483 | continue; | |
484 | } | |
485 | ||
486 | /* Flag that we handled this abbreviated item. */ | |
487 | rxa->datum[0] = XSTATE_DONE; | |
488 | ||
68ddbaf6 WD |
489 | write_varint(f_out, rxa->num - prior_req); |
490 | prior_req = rxa->num; | |
16edf865 WD |
491 | |
492 | if (fname) { | |
493 | size_t len = 0; | |
494 | char *ptr; | |
495 | ||
496 | /* Re-read the long datum. */ | |
a685271d WD |
497 | if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) { |
498 | rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname); | |
499 | write_varint(f_out, 0); | |
16edf865 | 500 | continue; |
a685271d | 501 | } |
16edf865 | 502 | |
f31514ad | 503 | write_varint(f_out, len); /* length might have changed! */ |
16edf865 WD |
504 | write_buf(f_out, ptr, len); |
505 | free(ptr); | |
506 | } | |
507 | } | |
508 | ||
509 | write_byte(f_out, 0); /* end the list */ | |
510 | } | |
511 | ||
16edf865 WD |
512 | /* When called by the sender, read the request from the generator and mark |
513 | * any needed xattrs with a flag that lets us know they need to be sent to | |
514 | * the receiver. When called by the receiver, reads the sent data and | |
515 | * stores it in place of its checksum. */ | |
e107b6b1 | 516 | int recv_xattr_request(struct file_struct *file, int f_in) |
16edf865 WD |
517 | { |
518 | item_list *lst = rsync_xal_l.items; | |
519 | char *old_datum, *name; | |
520 | rsync_xa *rxa; | |
68ddbaf6 | 521 | int rel_pos, cnt, num, got_xattr_data = 0; |
16edf865 WD |
522 | |
523 | if (F_XATTR(file) < 0) { | |
524 | rprintf(FERROR, "recv_xattr_request: internal data error!\n"); | |
525 | exit_cleanup(RERR_STREAMIO); | |
526 | } | |
527 | lst += F_XATTR(file); | |
528 | ||
529 | cnt = lst->count; | |
530 | rxa = lst->items; | |
68ddbaf6 | 531 | num = 0; |
f31514ad | 532 | while ((rel_pos = read_varint(f_in)) != 0) { |
68ddbaf6 WD |
533 | num += rel_pos; |
534 | while (cnt && rxa->num < num) { | |
535 | rxa++; | |
536 | cnt--; | |
537 | } | |
538 | if (!cnt || rxa->num != num) { | |
539 | rprintf(FERROR, "[%s] could not find xattr #%d for %s\n", | |
540 | who_am_i(), num, f_name(file, NULL)); | |
541 | exit_cleanup(RERR_STREAMIO); | |
542 | } | |
543 | if (rxa->datum_len <= MAX_FULL_DATUM || rxa->datum[0] != XSTATE_ABBREV) { | |
544 | rprintf(FERROR, "[%s] internal abbrev error!\n", who_am_i()); | |
16edf865 WD |
545 | exit_cleanup(RERR_STREAMIO); |
546 | } | |
547 | ||
548 | if (am_sender) { | |
549 | rxa->datum[0] = XSTATE_TODO; | |
550 | continue; | |
551 | } | |
552 | ||
553 | old_datum = rxa->datum; | |
f31514ad | 554 | rxa->datum_len = read_varint(f_in); |
16edf865 WD |
555 | |
556 | if (rxa->name_len + rxa->datum_len < rxa->name_len) | |
557 | out_of_memory("recv_xattr_request"); /* overflow */ | |
558 | rxa->datum = new_array(char, rxa->datum_len + rxa->name_len); | |
559 | if (!rxa->datum) | |
560 | out_of_memory("recv_xattr_request"); | |
561 | name = rxa->datum + rxa->datum_len; | |
562 | memcpy(name, rxa->name, rxa->name_len); | |
563 | rxa->name = name; | |
564 | free(old_datum); | |
565 | read_buf(f_in, rxa->datum, rxa->datum_len); | |
e107b6b1 | 566 | got_xattr_data = 1; |
16edf865 | 567 | } |
e107b6b1 WD |
568 | |
569 | return got_xattr_data; | |
16edf865 WD |
570 | } |
571 | ||
572 | /* ------------------------------------------------------------------------- */ | |
573 | ||
574 | /* receive and build the rsync_xattr_lists */ | |
575 | void receive_xattr(struct file_struct *file, int f) | |
576 | { | |
577 | static item_list temp_xattr = EMPTY_ITEM_LIST; | |
68ddbaf6 | 578 | int count, num; |
f31514ad | 579 | int ndx = read_varint(f); |
16edf865 WD |
580 | |
581 | if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) { | |
582 | rprintf(FERROR, "receive_xattr: xa index %d out of" | |
583 | " range for %s\n", ndx, f_name(file, NULL)); | |
584 | exit_cleanup(RERR_STREAMIO); | |
585 | } | |
586 | ||
587 | if (ndx != 0) { | |
588 | F_XATTR(file) = ndx - 1; | |
589 | return; | |
590 | } | |
591 | ||
f31514ad | 592 | if ((count = read_varint(f)) != 0) { |
16edf865 WD |
593 | (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count); |
594 | temp_xattr.count = 0; | |
595 | } | |
596 | ||
68ddbaf6 | 597 | for (num = 1; num <= count; num++) { |
16edf865 WD |
598 | char *ptr, *name; |
599 | rsync_xa *rxa; | |
f31514ad WD |
600 | size_t name_len = read_varint(f); |
601 | size_t datum_len = read_varint(f); | |
16edf865 | 602 | size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len; |
9439c0cb | 603 | size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0; |
16edf865 WD |
604 | if (dget_len + extra_len < dget_len) |
605 | out_of_memory("receive_xattr"); /* overflow */ | |
16edf865 WD |
606 | if (dget_len + extra_len + name_len < dget_len) |
607 | out_of_memory("receive_xattr"); /* overflow */ | |
608 | ptr = new_array(char, dget_len + extra_len + name_len); | |
609 | if (!ptr) | |
610 | out_of_memory("receive_xattr"); | |
611 | name = ptr + dget_len + extra_len; | |
612 | read_buf(f, name, name_len); | |
613 | if (dget_len == datum_len) | |
614 | read_buf(f, ptr, dget_len); | |
615 | else { | |
616 | *ptr = XSTATE_ABBREV; | |
617 | read_buf(f, ptr + 1, MAX_DIGEST_LEN); | |
618 | } | |
619 | #ifdef HAVE_LINUX_XATTRS | |
620 | /* Non-root can only save the user namespace. */ | |
68ddbaf6 WD |
621 | if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) { |
622 | if (!am_root) { | |
623 | free(ptr); | |
624 | continue; | |
625 | } | |
626 | name -= RPRE_LEN; | |
627 | name_len += RPRE_LEN; | |
628 | memcpy(name, RSYNC_PREFIX, RPRE_LEN); | |
16edf865 WD |
629 | } |
630 | #else | |
631 | /* This OS only has a user namespace, so we either | |
632 | * strip the user prefix, or we put a non-user | |
633 | * namespace inside our rsync hierarchy. */ | |
634 | if (HAS_PREFIX(name, USER_PREFIX)) { | |
635 | name += UPRE_LEN; | |
636 | name_len -= UPRE_LEN; | |
637 | } else if (am_root) { | |
638 | name -= RPRE_LEN; | |
639 | name_len += RPRE_LEN; | |
640 | memcpy(name, RSYNC_PREFIX, RPRE_LEN); | |
641 | } else { | |
642 | free(ptr); | |
643 | continue; | |
644 | } | |
645 | #endif | |
524eaa82 WD |
646 | /* No rsync.%FOO attributes are copied w/o 2 -X options. */ |
647 | if (preserve_xattrs < 2 && name_len > RPRE_LEN | |
648 | && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) { | |
9439c0cb WD |
649 | free(ptr); |
650 | continue; | |
651 | } | |
16edf865 WD |
652 | rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1); |
653 | rxa->name = name; | |
654 | rxa->datum = ptr; | |
655 | rxa->name_len = name_len; | |
656 | rxa->datum_len = datum_len; | |
68ddbaf6 | 657 | rxa->num = num; |
16edf865 WD |
658 | } |
659 | ||
660 | ndx = rsync_xal_l.count; /* pre-incremented count */ | |
661 | rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */ | |
662 | ||
663 | F_XATTR(file) = ndx; | |
664 | } | |
665 | ||
13710874 | 666 | /* Turn the xattr data in stat_x into cached xattr data, setting the index |
16edf865 | 667 | * values in the file struct. */ |
13710874 | 668 | void cache_xattr(struct file_struct *file, stat_x *sxp) |
16edf865 WD |
669 | { |
670 | int ndx; | |
671 | ||
672 | if (!sxp->xattr) | |
673 | return; | |
674 | ||
675 | ndx = find_matching_xattr(sxp->xattr); | |
676 | if (ndx < 0) | |
677 | rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */ | |
678 | ||
679 | F_XATTR(file) = ndx; | |
680 | } | |
681 | ||
682 | static int rsync_xal_set(const char *fname, item_list *xalp, | |
13710874 | 683 | const char *fnamecmp, stat_x *sxp) |
16edf865 WD |
684 | { |
685 | rsync_xa *rxas = xalp->items; | |
686 | ssize_t list_len; | |
687 | size_t i, len; | |
688 | char *name, *ptr, sum[MAX_DIGEST_LEN]; | |
689 | int name_len, ret = 0; | |
690 | ||
691 | /* This puts the current name list into the "namebuf" buffer. */ | |
692 | if ((list_len = get_xattr_names(fname)) < 0) | |
693 | return -1; | |
694 | ||
695 | for (i = 0; i < xalp->count; i++) { | |
696 | name = rxas[i].name; | |
697 | ||
698 | if (XATTR_ABBREV(rxas[i])) { | |
699 | /* See if the fnamecmp version is identical. */ | |
700 | len = name_len = rxas[i].name_len; | |
701 | if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) { | |
702 | still_abbrev: | |
703 | if (am_generator) | |
704 | continue; | |
705 | rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n", | |
706 | rxas[i].name, full_fname(fname)); | |
707 | ret = -1; | |
708 | continue; | |
709 | } | |
710 | if (len != rxas[i].datum_len) { | |
711 | free(ptr); | |
712 | goto still_abbrev; | |
713 | } | |
714 | ||
715 | sum_init(checksum_seed); | |
716 | sum_update(ptr, len); | |
717 | sum_end(sum); | |
718 | if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) { | |
719 | free(ptr); | |
720 | goto still_abbrev; | |
721 | } | |
722 | ||
723 | if (fname == fnamecmp) | |
724 | ; /* Value is already set when identical */ | |
725 | else if (sys_lsetxattr(fname, name, ptr, len) < 0) { | |
3f0211b6 | 726 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
727 | "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed", |
728 | fname, name); | |
729 | ret = -1; | |
730 | } else /* make sure caller sets mtime */ | |
731 | sxp->st.st_mtime = (time_t)-1; | |
732 | ||
733 | if (am_generator) { /* generator items stay abbreviated */ | |
16edf865 WD |
734 | free(ptr); |
735 | continue; | |
736 | } | |
737 | ||
738 | memcpy(ptr + len, name, name_len); | |
739 | free(rxas[i].datum); | |
740 | ||
741 | rxas[i].name = name = ptr + len; | |
742 | rxas[i].datum = ptr; | |
743 | continue; | |
744 | } | |
745 | ||
746 | if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) { | |
3f0211b6 | 747 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
748 | "rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed", |
749 | fname, name); | |
750 | ret = -1; | |
751 | } else /* make sure caller sets mtime */ | |
752 | sxp->st.st_mtime = (time_t)-1; | |
753 | } | |
754 | ||
755 | /* Remove any extraneous names. */ | |
756 | for (name = namebuf; list_len > 0; name += name_len) { | |
757 | name_len = strlen(name) + 1; | |
758 | list_len -= name_len; | |
759 | ||
760 | #ifdef HAVE_LINUX_XATTRS | |
761 | /* We always ignore the system namespace, and non-root | |
762 | * ignores everything but the user namespace. */ | |
763 | if (am_root ? HAS_PREFIX(name, SYSTEM_PREFIX) | |
764 | : !HAS_PREFIX(name, USER_PREFIX)) | |
765 | continue; | |
766 | #endif | |
e107b6b1 WD |
767 | if (am_root < 0 && name_len > RPRE_LEN |
768 | && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0) | |
769 | continue; | |
16edf865 WD |
770 | |
771 | for (i = 0; i < xalp->count; i++) { | |
772 | if (strcmp(name, rxas[i].name) == 0) | |
773 | break; | |
774 | } | |
775 | if (i == xalp->count) { | |
776 | if (sys_lremovexattr(fname, name) < 0) { | |
3f0211b6 | 777 | rsyserr(FERROR_XFER, errno, |
16edf865 WD |
778 | "rsync_xal_clear: lremovexattr(\"%s\",\"%s\") failed", |
779 | fname, name); | |
780 | ret = -1; | |
781 | } else /* make sure caller sets mtime */ | |
782 | sxp->st.st_mtime = (time_t)-1; | |
783 | } | |
784 | } | |
785 | ||
786 | return ret; | |
787 | } | |
788 | ||
789 | /* Set extended attributes on indicated filename. */ | |
790 | int set_xattr(const char *fname, const struct file_struct *file, | |
13710874 | 791 | const char *fnamecmp, stat_x *sxp) |
16edf865 WD |
792 | { |
793 | int ndx; | |
794 | item_list *lst = rsync_xal_l.items; | |
795 | ||
796 | if (dry_run) | |
797 | return 1; /* FIXME: --dry-run needs to compute this value */ | |
798 | ||
799 | if (read_only || list_only) { | |
800 | errno = EROFS; | |
801 | return -1; | |
802 | } | |
803 | ||
804 | ndx = F_XATTR(file); | |
805 | return rsync_xal_set(fname, lst + ndx, fnamecmp, sxp); | |
806 | } | |
807 | ||
7ed6bc53 WD |
808 | #ifdef SUPPORT_ACLS |
809 | char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p) | |
810 | { | |
811 | const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR; | |
e516b69e | 812 | *len_p = 0; /* no extra data alloc needed from get_xattr_data() */ |
7ed6bc53 WD |
813 | return get_xattr_data(fname, name, len_p, 1); |
814 | } | |
815 | ||
816 | int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len) | |
817 | { | |
818 | const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR; | |
819 | if (sys_lsetxattr(fname, name, buf, buf_len) < 0) { | |
3f0211b6 | 820 | rsyserr(FERROR_XFER, errno, |
7ed6bc53 WD |
821 | "set_xattr_acl: lsetxattr(\"%s\",\"%s\") failed", |
822 | fname, name); | |
823 | return -1; | |
824 | } | |
825 | return 0; | |
826 | } | |
827 | ||
828 | int del_def_xattr_acl(const char *fname) | |
829 | { | |
830 | return sys_lremovexattr(fname, XDEF_ACL_ATTR); | |
831 | } | |
832 | #endif | |
833 | ||
9439c0cb WD |
834 | int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst) |
835 | { | |
836 | int mode, rdev_major, rdev_minor, uid, gid, len; | |
837 | char buf[256]; | |
838 | ||
839 | if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode)) | |
840 | return -1; | |
841 | ||
842 | if (xst) | |
843 | *xst = *fst; | |
844 | else | |
845 | xst = fst; | |
846 | if (fname) { | |
847 | fd = -1; | |
848 | len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1); | |
849 | } else { | |
850 | fname = "fd"; | |
851 | len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1); | |
852 | } | |
853 | if (len >= (int)sizeof buf) { | |
854 | len = -1; | |
855 | errno = ERANGE; | |
856 | } | |
857 | if (len < 0) { | |
858 | if (errno == ENOTSUP || errno == ENOATTR) | |
859 | return -1; | |
860 | if (errno == EPERM && S_ISLNK(fst->st_mode)) { | |
861 | xst->st_uid = 0; | |
862 | xst->st_gid = 0; | |
863 | return 0; | |
864 | } | |
3f0211b6 | 865 | rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s", |
9439c0cb WD |
866 | XSTAT_ATTR, full_fname(fname)); |
867 | return -1; | |
868 | } | |
869 | buf[len] = '\0'; | |
870 | ||
871 | if (sscanf(buf, "%o %d,%d %d:%d", | |
872 | &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) { | |
873 | rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n", | |
874 | XSTAT_ATTR, full_fname(fname), buf); | |
875 | exit_cleanup(RERR_FILEIO); | |
876 | } | |
877 | ||
878 | xst->st_mode = from_wire_mode(mode); | |
879 | xst->st_rdev = MAKEDEV(rdev_major, rdev_minor); | |
880 | xst->st_uid = uid; | |
881 | xst->st_gid = gid; | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
e107b6b1 | 886 | int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode) |
9439c0cb WD |
887 | { |
888 | STRUCT_STAT fst, xst; | |
889 | dev_t rdev; | |
890 | mode_t mode, fmode; | |
891 | ||
892 | if (dry_run) | |
893 | return 0; | |
894 | ||
895 | if (read_only || list_only) { | |
3f0211b6 | 896 | rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s", |
9439c0cb WD |
897 | XSTAT_ATTR, full_fname(fname)); |
898 | return -1; | |
899 | } | |
900 | ||
901 | if (x_lstat(fname, &fst, &xst) < 0) { | |
3f0211b6 | 902 | rsyserr(FERROR_XFER, errno, "failed to re-stat %s", |
9439c0cb WD |
903 | full_fname(fname)); |
904 | return -1; | |
905 | } | |
906 | ||
907 | fst.st_mode &= (_S_IFMT | CHMOD_BITS); | |
e107b6b1 | 908 | fmode = new_mode & (_S_IFMT | CHMOD_BITS); |
9439c0cb WD |
909 | |
910 | if (IS_DEVICE(fmode) || IS_SPECIAL(fmode)) { | |
911 | uint32 *devp = F_RDEV_P(file); | |
912 | rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)); | |
913 | } else | |
914 | rdev = 0; | |
915 | ||
916 | /* Dump the special permissions and enable full owner access. */ | |
917 | mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS) | |
918 | | (S_ISDIR(fst.st_mode) ? 0700 : 0600); | |
919 | if (fst.st_mode != mode) | |
920 | do_chmod(fname, mode); | |
921 | if (!IS_DEVICE(fst.st_mode) && !IS_SPECIAL(fst.st_mode)) | |
922 | fst.st_rdev = 0; /* just in case */ | |
923 | ||
924 | if (mode == fmode && fst.st_rdev == rdev | |
fb7b9ddc | 925 | && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) { |
9439c0cb WD |
926 | /* xst.st_mode will be 0 if there's no current stat xattr */ |
927 | if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) { | |
3f0211b6 | 928 | rsyserr(FERROR_XFER, errno, |
9439c0cb WD |
929 | "delete of stat xattr failed for %s", |
930 | full_fname(fname)); | |
931 | return -1; | |
932 | } | |
933 | return 0; | |
934 | } | |
935 | ||
936 | if (xst.st_mode != fmode || xst.st_rdev != rdev | |
fb7b9ddc | 937 | || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) { |
9439c0cb WD |
938 | char buf[256]; |
939 | int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u", | |
940 | to_wire_mode(fmode), | |
941 | (int)major(rdev), (int)minor(rdev), | |
fb7b9ddc | 942 | F_OWNER(file), F_GROUP(file)); |
9439c0cb WD |
943 | if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) { |
944 | if (errno == EPERM && S_ISLNK(fst.st_mode)) | |
945 | return 0; | |
3f0211b6 | 946 | rsyserr(FERROR_XFER, errno, |
9439c0cb WD |
947 | "failed to write xattr %s for %s", |
948 | XSTAT_ATTR, full_fname(fname)); | |
949 | return -1; | |
950 | } | |
951 | } | |
952 | ||
953 | return 0; | |
954 | } | |
955 | ||
956 | int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
957 | { | |
958 | int ret = do_stat(fname, fst); | |
959 | if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst) | |
960 | xst->st_mode = 0; | |
961 | return ret; | |
962 | } | |
963 | ||
964 | int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
965 | { | |
966 | int ret = do_lstat(fname, fst); | |
967 | if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst) | |
968 | xst->st_mode = 0; | |
969 | return ret; | |
970 | } | |
971 | ||
972 | int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst) | |
973 | { | |
974 | int ret = do_fstat(fd, fst); | |
975 | if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst) | |
976 | xst->st_mode = 0; | |
977 | return ret; | |
978 | } | |
979 | ||
16edf865 | 980 | #endif /* SUPPORT_XATTRS */ |