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ctdb:packaging:RPM: don't run autogen.
[Samba.git] / source3 / modules / vfs_shadow_copy2.c
blob8243f6329d0d78063266f84f809f602b0a24735e
1 /*
2 * shadow_copy2: a shadow copy module (second implementation)
3 *
4 * Copyright (C) Andrew Tridgell 2007 (portions taken from shadow_copy2)
5 * Copyright (C) Ed Plese 2009
6 * Copyright (C) Volker Lendecke 2011
7 * Copyright (C) Christian Ambach 2011
8 * Copyright (C) Michael Adam 2013
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25 /*
26 * This is a second implemetation of a shadow copy module for exposing
27 * file system snapshots to windows clients as shadow copies.
28 *
29 * See the manual page for documentation.
30 */
31
32 #include "includes.h"
33 #include "system/filesys.h"
34 #include "include/ntioctl.h"
35 #include <ccan/hash/hash.h>
36 #include "util_tdb.h"
37
38 struct shadow_copy2_config {
39 char *gmt_format;
40 bool use_sscanf;
41 bool use_localtime;
42 char *snapdir;
43 bool snapdirseverywhere;
44 bool crossmountpoints;
45 bool fixinodes;
46 char *sort_order;
47 bool snapdir_absolute;
48 char *basedir;
49 char *mount_point;
50 char *rel_connectpath; /* share root, relative to the basedir */
51 char *snapshot_basepath; /* the absolute version of snapdir */
52 };
53
54 static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
55 size_t **poffsets,
56 unsigned *pnum_offsets)
57 {
58 unsigned num_offsets;
59 size_t *offsets;
60 const char *p;
61
62 num_offsets = 0;
63
64 p = str;
65 while ((p = strchr(p, '/')) != NULL) {
66 num_offsets += 1;
67 p += 1;
68 }
69
70 offsets = talloc_array(mem_ctx, size_t, num_offsets);
71 if (offsets == NULL) {
72 return false;
73 }
74
75 p = str;
76 num_offsets = 0;
77 while ((p = strchr(p, '/')) != NULL) {
78 offsets[num_offsets] = p-str;
79 num_offsets += 1;
80 p += 1;
81 }
82
83 *poffsets = offsets;
84 *pnum_offsets = num_offsets;
85 return true;
86 }
87
88 /**
89 * Given a timstamp, build the posix level GTM-tag string
90 * based on the configurable format.
91 */
92 static size_t shadow_copy2_posix_gmt_string(struct vfs_handle_struct *handle,
93 time_t snapshot,
94 char *snaptime_string,
95 size_t len)
96 {
97 struct tm snap_tm;
98 size_t snaptime_len;
99 struct shadow_copy2_config *config;
100
101 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
102 return 0);
103
104 if (config->use_sscanf) {
105 snaptime_len = snprintf(snaptime_string,
106 len,
107 config->gmt_format,
108 (unsigned long)snapshot);
109 if (snaptime_len <= 0) {
110 DEBUG(10, ("snprintf failed\n"));
111 return snaptime_len;
112 }
113 } else {
114 if (config->use_localtime) {
115 if (localtime_r(&snapshot, &snap_tm) == 0) {
116 DEBUG(10, ("gmtime_r failed\n"));
117 return -1;
118 }
119 } else {
120 if (gmtime_r(&snapshot, &snap_tm) == 0) {
121 DEBUG(10, ("gmtime_r failed\n"));
122 return -1;
123 }
124 }
125 snaptime_len = strftime(snaptime_string,
126 len,
127 config->gmt_format,
128 &snap_tm);
129 if (snaptime_len == 0) {
130 DEBUG(10, ("strftime failed\n"));
131 return 0;
132 }
133 }
134
135 return snaptime_len;
136 }
137
138 /**
139 * Given a timstamp, build the string to insert into a path
140 * as a path component for creating the local path to the
141 * snapshot at the given timestamp of the input path.
142 *
143 * In the case of a parallel snapdir (specified with an
144 * absolute path), this is the inital portion of the
145 * local path of any snapshot file. The complete path is
146 * obtained by appending the portion of the file's path
147 * below the share root's mountpoint.
148 */
149 static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
150 struct vfs_handle_struct *handle,
151 time_t snapshot)
152 {
153 fstring snaptime_string;
154 size_t snaptime_len = 0;
155 char *result = NULL;
156 struct shadow_copy2_config *config;
157
158 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
159 return NULL);
160
161 snaptime_len = shadow_copy2_posix_gmt_string(handle,
162 snapshot,
163 snaptime_string,
164 sizeof(snaptime_string));
165 if (snaptime_len <= 0) {
166 return NULL;
167 }
168
169 if (config->snapdir_absolute) {
170 result = talloc_asprintf(mem_ctx, "%s/%s",
171 config->snapdir, snaptime_string);
172 } else {
173 result = talloc_asprintf(mem_ctx, "/%s/%s",
174 config->snapdir, snaptime_string);
175 }
176 if (result == NULL) {
177 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
178 }
179
180 return result;
181 }
182
183 /**
184 * Build the posix snapshot path for the connection
185 * at the given timestamp, i.e. the absolute posix path
186 * that contains the snapshot for this file system.
187 *
188 * This only applies to classical case, i.e. not
189 * to the "snapdirseverywhere" mode.
190 */
191 static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
192 struct vfs_handle_struct *handle,
193 time_t snapshot)
194 {
195 fstring snaptime_string;
196 size_t snaptime_len = 0;
197 char *result = NULL;
198 struct shadow_copy2_config *config;
199
200 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
201 return NULL);
202
203 snaptime_len = shadow_copy2_posix_gmt_string(handle,
204 snapshot,
205 snaptime_string,
206 sizeof(snaptime_string));
207 if (snaptime_len <= 0) {
208 return NULL;
209 }
210
211 result = talloc_asprintf(mem_ctx, "%s/%s",
212 config->snapshot_basepath, snaptime_string);
213 if (result == NULL) {
214 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
215 }
216
217 return result;
218 }
219
220 /**
221 * Strip a snapshot component from an filename as
222 * handed in via the smb layer.
223 * Returns the parsed timestamp and the stripped filename.
224 */
225 static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
226 struct vfs_handle_struct *handle,
227 const char *name,
228 time_t *ptimestamp,
229 char **pstripped)
230 {
231 struct tm tm;
232 time_t timestamp;
233 const char *p;
234 char *q;
235 char *stripped;
236 size_t rest_len, dst_len;
237 struct shadow_copy2_config *config;
238
239 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
240 return false);
241
242 DEBUG(10, (__location__ ": enter path '%s'\n", name));
243
244 p = strstr_m(name, "@GMT-");
245 if (p == NULL) {
246 goto no_snapshot;
247 }
248 if ((p > name) && (p[-1] != '/')) {
249 /* the GMT-token does not start a path-component */
250 goto no_snapshot;
251 }
252 q = strptime(p, GMT_FORMAT, &tm);
253 if (q == NULL) {
254 goto no_snapshot;
255 }
256 tm.tm_isdst = -1;
257 timestamp = timegm(&tm);
258 if (timestamp == (time_t)-1) {
259 goto no_snapshot;
260 }
261 if ((p == name) && (q[0] == '\0')) {
262 /* the name consists of only the GMT token */
263 if (pstripped != NULL) {
264 stripped = talloc_strdup(mem_ctx, "");
265 if (stripped == NULL) {
266 return false;
267 }
268 *pstripped = stripped;
269 }
270 *ptimestamp = timestamp;
271 return true;
272 }
273 if (q[0] != '/') {
274 /*
275 * The GMT token is either at the end of the path
276 * or it is not a complete path component, i.e. the
277 * path component continues after the gmt-token.
278 *
279 * TODO: Is this correct? Or would the GMT tag as the
280 * last component be a valid input?
281 */
282 goto no_snapshot;
283 }
284 q += 1;
285
286 rest_len = strlen(q);
287 dst_len = (p-name) + rest_len;
288
289 if (config->snapdirseverywhere) {
290 char *insert;
291 bool have_insert;
292 insert = shadow_copy2_insert_string(talloc_tos(), handle,
293 timestamp);
294 if (insert == NULL) {
295 errno = ENOMEM;
296 return false;
297 }
298
299 DEBUG(10, (__location__ ": snapdirseverywhere mode.\n"
300 "path '%s'.\n"
301 "insert string '%s'\n", name, insert));
302
303 have_insert = (strstr(name, insert+1) != NULL);
304 if (have_insert) {
305 DEBUG(10, (__location__ ": insert string '%s' found in "
306 "path '%s' found in snapdirseverywhere mode "
307 "==> already converted\n", insert, name));
308 TALLOC_FREE(insert);
309 goto no_snapshot;
310 }
311 TALLOC_FREE(insert);
312 } else {
313 char *snapshot_path;
314 char *s;
315
316 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
317 handle,
318 timestamp);
319 if (snapshot_path == NULL) {
320 errno = ENOMEM;
321 return false;
322 }
323
324 DEBUG(10, (__location__ " path: '%s'.\n"
325 "snapshot path: '%s'\n", name, snapshot_path));
326
327 s = strstr(name, snapshot_path);
328 if (s == name) {
329 /*
330 * this starts with "snapshot_basepath/GMT-Token"
331 * so it is already a converted absolute
332 * path. Don't process further.
333 */
334 DEBUG(10, (__location__ ": path '%s' starts with "
335 "snapshot path '%s' (not in "
336 "snapdirseverywhere mode) ==> "
337 "already converted\n", name, snapshot_path));
338 talloc_free(snapshot_path);
339 goto no_snapshot;
340 }
341 talloc_free(snapshot_path);
342 }
343
344 if (pstripped != NULL) {
345 stripped = talloc_array(mem_ctx, char, dst_len+1);
346 if (stripped == NULL) {
347 errno = ENOMEM;
348 return false;
349 }
350 if (p > name) {
351 memcpy(stripped, name, p-name);
352 }
353 if (rest_len > 0) {
354 memcpy(stripped + (p-name), q, rest_len);
355 }
356 stripped[dst_len] = '\0';
357 *pstripped = stripped;
358 }
359 *ptimestamp = timestamp;
360 return true;
361 no_snapshot:
362 *ptimestamp = 0;
363 return true;
364 }
365
366 static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
367 vfs_handle_struct *handle)
368 {
369 char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
370 dev_t dev;
371 struct stat st;
372 char *p;
373
374 if (stat(path, &st) != 0) {
375 talloc_free(path);
376 return NULL;
377 }
378
379 dev = st.st_dev;
380
381 while ((p = strrchr(path, '/')) && p > path) {
382 *p = 0;
383 if (stat(path, &st) != 0) {
384 talloc_free(path);
385 return NULL;
386 }
387 if (st.st_dev != dev) {
388 *p = '/';
389 break;
390 }
391 }
392
393 return path;
394 }
395
396 /**
397 * Convert from a name as handed in via the SMB layer
398 * and a timestamp into the local path of the snapshot
399 * of the provided file at the provided time.
400 */
401 static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
402 struct vfs_handle_struct *handle,
403 const char *name, time_t timestamp)
404 {
405 struct smb_filename converted_fname;
406 char *result = NULL;
407 size_t *slashes = NULL;
408 unsigned num_slashes;
409 char *path = NULL;
410 size_t pathlen;
411 char *insert = NULL;
412 char *converted = NULL;
413 size_t insertlen;
414 int i, saved_errno;
415 size_t min_offset;
416 struct shadow_copy2_config *config;
417
418 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
419 return NULL);
420
421 DEBUG(10, ("converting '%s'\n", name));
422
423 if (!config->snapdirseverywhere) {
424 int ret;
425 char *snapshot_path;
426
427 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
428 handle,
429 timestamp);
430 if (snapshot_path == NULL) {
431 goto fail;
432 }
433
434 if (config->rel_connectpath == NULL) {
435 converted = talloc_asprintf(mem_ctx, "%s/%s",
436 snapshot_path, name);
437 } else {
438 converted = talloc_asprintf(mem_ctx, "%s/%s/%s",
439 snapshot_path,
440 config->rel_connectpath,
441 name);
442 }
443 if (converted == NULL) {
444 goto fail;
445 }
446
447 ZERO_STRUCT(converted_fname);
448 converted_fname.base_name = converted;
449
450 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
451 DEBUG(10, ("Trying[not snapdirseverywhere] %s: %d (%s)\n",
452 converted,
453 ret, ret == 0 ? "ok" : strerror(errno)));
454 if (ret == 0) {
455 DEBUG(10, ("Found %s\n", converted));
456 result = converted;
457 converted = NULL;
458 goto fail;
459 } else {
460 errno = ENOENT;
461 goto fail;
462 }
463 /* never reached ... */
464 }
465
466 path = talloc_asprintf(mem_ctx, "%s/%s", handle->conn->connectpath,
467 name);
468 if (path == NULL) {
469 errno = ENOMEM;
470 goto fail;
471 }
472 pathlen = talloc_get_size(path)-1;
473
474 if (!shadow_copy2_find_slashes(talloc_tos(), path,
475 &slashes, &num_slashes)) {
476 goto fail;
477 }
478
479 insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
480 if (insert == NULL) {
481 goto fail;
482 }
483 insertlen = talloc_get_size(insert)-1;
484
485 converted = talloc_zero_array(mem_ctx, char, pathlen + insertlen + 1);
486 if (converted == NULL) {
487 goto fail;
488 }
489
490 if (path[pathlen-1] != '/') {
491 /*
492 * Append a fake slash to find the snapshot root
493 */
494 size_t *tmp;
495 tmp = talloc_realloc(talloc_tos(), slashes,
496 size_t, num_slashes+1);
497 if (tmp == NULL) {
498 goto fail;
499 }
500 slashes = tmp;
501 slashes[num_slashes] = pathlen;
502 num_slashes += 1;
503 }
504
505 min_offset = 0;
506
507 if (!config->crossmountpoints) {
508 min_offset = strlen(config->mount_point);
509 }
510
511 memcpy(converted, path, pathlen+1);
512 converted[pathlen+insertlen] = '\0';
513
514 ZERO_STRUCT(converted_fname);
515 converted_fname.base_name = converted;
516
517 for (i = num_slashes-1; i>=0; i--) {
518 int ret;
519 size_t offset;
520
521 offset = slashes[i];
522
523 if (offset < min_offset) {
524 errno = ENOENT;
525 goto fail;
526 }
527
528 memcpy(converted+offset, insert, insertlen);
529
530 offset += insertlen;
531 memcpy(converted+offset, path + slashes[i],
532 pathlen - slashes[i]);
533
534 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
535
536 DEBUG(10, ("Trying[snapdirseverywhere] %s: %d (%s)\n",
537 converted,
538 ret, ret == 0 ? "ok" : strerror(errno)));
539 if (ret == 0) {
540 /* success */
541 break;
542 }
543 if (errno == ENOTDIR) {
544 /*
545 * This is a valid condition: We appended the
546 * .snaphots/@GMT.. to a file name. Just try
547 * with the upper levels.
548 */
549 continue;
550 }
551 if (errno != ENOENT) {
552 /* Other problem than "not found" */
553 goto fail;
554 }
555 }
556
557 if (i >= 0) {
558 /*
559 * Found something
560 */
561 DEBUG(10, ("Found %s\n", converted));
562 result = converted;
563 converted = NULL;
564 } else {
565 errno = ENOENT;
566 }
567 fail:
568 saved_errno = errno;
569 TALLOC_FREE(converted);
570 TALLOC_FREE(insert);
571 TALLOC_FREE(slashes);
572 TALLOC_FREE(path);
573 errno = saved_errno;
574 return result;
575 }
576
577 /*
578 modify a sbuf return to ensure that inodes in the shadow directory
579 are different from those in the main directory
580 */
581 static void convert_sbuf(vfs_handle_struct *handle, const char *fname,
582 SMB_STRUCT_STAT *sbuf)
583 {
584 struct shadow_copy2_config *config;
585
586 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
587 return);
588
589 if (config->fixinodes) {
590 /* some snapshot systems, like GPFS, return the name
591 device:inode for the snapshot files as the current
592 files. That breaks the 'restore' button in the shadow copy
593 GUI, as the client gets a sharing violation.
594
595 This is a crude way of allowing both files to be
596 open at once. It has a slight chance of inode
597 number collision, but I can't see a better approach
598 without significant VFS changes
599 */
600 uint32_t shash;
601
602 shash = hash(fname, strlen(fname), 0) & 0xFF000000;
603 if (shash == 0) {
604 shash = 1;
605 }
606 sbuf->st_ex_ino ^= shash;
607 }
608 }
609
610 static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
611 const char *fname,
612 const char *mask,
613 uint32 attr)
614 {
615 time_t timestamp;
616 char *stripped;
617 DIR *ret;
618 int saved_errno;
619 char *conv;
620
621 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
622 &timestamp, &stripped)) {
623 return NULL;
624 }
625 if (timestamp == 0) {
626 return SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
627 }
628 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
629 TALLOC_FREE(stripped);
630 if (conv == NULL) {
631 return NULL;
632 }
633 ret = SMB_VFS_NEXT_OPENDIR(handle, conv, mask, attr);
634 saved_errno = errno;
635 TALLOC_FREE(conv);
636 errno = saved_errno;
637 return ret;
638 }
639
640 static int shadow_copy2_rename(vfs_handle_struct *handle,
641 const struct smb_filename *smb_fname_src,
642 const struct smb_filename *smb_fname_dst)
643 {
644 time_t timestamp_src, timestamp_dst;
645
646 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
647 smb_fname_src->base_name,
648 &timestamp_src, NULL)) {
649 return -1;
650 }
651 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
652 smb_fname_dst->base_name,
653 &timestamp_dst, NULL)) {
654 return -1;
655 }
656 if (timestamp_src != 0) {
657 errno = EXDEV;
658 return -1;
659 }
660 if (timestamp_dst != 0) {
661 errno = EROFS;
662 return -1;
663 }
664 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
665 }
666
667 static int shadow_copy2_symlink(vfs_handle_struct *handle,
668 const char *oldname, const char *newname)
669 {
670 time_t timestamp_old, timestamp_new;
671
672 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, oldname,
673 &timestamp_old, NULL)) {
674 return -1;
675 }
676 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, newname,
677 &timestamp_new, NULL)) {
678 return -1;
679 }
680 if ((timestamp_old != 0) || (timestamp_new != 0)) {
681 errno = EROFS;
682 return -1;
683 }
684 return SMB_VFS_NEXT_SYMLINK(handle, oldname, newname);
685 }
686
687 static int shadow_copy2_link(vfs_handle_struct *handle,
688 const char *oldname, const char *newname)
689 {
690 time_t timestamp_old, timestamp_new;
691
692 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, oldname,
693 &timestamp_old, NULL)) {
694 return -1;
695 }
696 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, newname,
697 &timestamp_new, NULL)) {
698 return -1;
699 }
700 if ((timestamp_old != 0) || (timestamp_new != 0)) {
701 errno = EROFS;
702 return -1;
703 }
704 return SMB_VFS_NEXT_LINK(handle, oldname, newname);
705 }
706
707 static int shadow_copy2_stat(vfs_handle_struct *handle,
708 struct smb_filename *smb_fname)
709 {
710 time_t timestamp;
711 char *stripped, *tmp;
712 int ret, saved_errno;
713
714 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
715 smb_fname->base_name,
716 &timestamp, &stripped)) {
717 return -1;
718 }
719 if (timestamp == 0) {
720 return SMB_VFS_NEXT_STAT(handle, smb_fname);
721 }
722
723 tmp = smb_fname->base_name;
724 smb_fname->base_name = shadow_copy2_convert(
725 talloc_tos(), handle, stripped, timestamp);
726 TALLOC_FREE(stripped);
727
728 if (smb_fname->base_name == NULL) {
729 smb_fname->base_name = tmp;
730 return -1;
731 }
732
733 ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
734 saved_errno = errno;
735
736 TALLOC_FREE(smb_fname->base_name);
737 smb_fname->base_name = tmp;
738
739 if (ret == 0) {
740 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
741 }
742 errno = saved_errno;
743 return ret;
744 }
745
746 static int shadow_copy2_lstat(vfs_handle_struct *handle,
747 struct smb_filename *smb_fname)
748 {
749 time_t timestamp;
750 char *stripped, *tmp;
751 int ret, saved_errno;
752
753 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
754 smb_fname->base_name,
755 &timestamp, &stripped)) {
756 return -1;
757 }
758 if (timestamp == 0) {
759 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
760 }
761
762 tmp = smb_fname->base_name;
763 smb_fname->base_name = shadow_copy2_convert(
764 talloc_tos(), handle, stripped, timestamp);
765 TALLOC_FREE(stripped);
766
767 if (smb_fname->base_name == NULL) {
768 smb_fname->base_name = tmp;
769 return -1;
770 }
771
772 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
773 saved_errno = errno;
774
775 TALLOC_FREE(smb_fname->base_name);
776 smb_fname->base_name = tmp;
777
778 if (ret == 0) {
779 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
780 }
781 errno = saved_errno;
782 return ret;
783 }
784
785 static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
786 SMB_STRUCT_STAT *sbuf)
787 {
788 time_t timestamp;
789 int ret;
790
791 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
792 if (ret == -1) {
793 return ret;
794 }
795 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
796 fsp->fsp_name->base_name,
797 &timestamp, NULL)) {
798 return 0;
799 }
800 if (timestamp != 0) {
801 convert_sbuf(handle, fsp->fsp_name->base_name, sbuf);
802 }
803 return 0;
804 }
805
806 static int shadow_copy2_open(vfs_handle_struct *handle,
807 struct smb_filename *smb_fname, files_struct *fsp,
808 int flags, mode_t mode)
809 {
810 time_t timestamp;
811 char *stripped, *tmp;
812 int ret, saved_errno;
813
814 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
815 smb_fname->base_name,
816 &timestamp, &stripped)) {
817 return -1;
818 }
819 if (timestamp == 0) {
820 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
821 }
822
823 tmp = smb_fname->base_name;
824 smb_fname->base_name = shadow_copy2_convert(
825 talloc_tos(), handle, stripped, timestamp);
826 TALLOC_FREE(stripped);
827
828 if (smb_fname->base_name == NULL) {
829 smb_fname->base_name = tmp;
830 return -1;
831 }
832
833 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
834 saved_errno = errno;
835
836 TALLOC_FREE(smb_fname->base_name);
837 smb_fname->base_name = tmp;
838
839 errno = saved_errno;
840 return ret;
841 }
842
843 static int shadow_copy2_unlink(vfs_handle_struct *handle,
844 const struct smb_filename *smb_fname)
845 {
846 time_t timestamp;
847 char *stripped;
848 int ret, saved_errno;
849 struct smb_filename *conv;
850
851 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
852 smb_fname->base_name,
853 &timestamp, &stripped)) {
854 return -1;
855 }
856 if (timestamp == 0) {
857 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
858 }
859 conv = cp_smb_filename(talloc_tos(), smb_fname);
860 if (conv == NULL) {
861 errno = ENOMEM;
862 return -1;
863 }
864 conv->base_name = shadow_copy2_convert(
865 conv, handle, stripped, timestamp);
866 TALLOC_FREE(stripped);
867 if (conv->base_name == NULL) {
868 return -1;
869 }
870 ret = SMB_VFS_NEXT_UNLINK(handle, conv);
871 saved_errno = errno;
872 TALLOC_FREE(conv);
873 errno = saved_errno;
874 return ret;
875 }
876
877 static int shadow_copy2_chmod(vfs_handle_struct *handle, const char *fname,
878 mode_t mode)
879 {
880 time_t timestamp;
881 char *stripped;
882 int ret, saved_errno;
883 char *conv;
884
885 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
886 &timestamp, &stripped)) {
887 return -1;
888 }
889 if (timestamp == 0) {
890 return SMB_VFS_NEXT_CHMOD(handle, fname, mode);
891 }
892 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
893 TALLOC_FREE(stripped);
894 if (conv == NULL) {
895 return -1;
896 }
897 ret = SMB_VFS_NEXT_CHMOD(handle, conv, mode);
898 saved_errno = errno;
899 TALLOC_FREE(conv);
900 errno = saved_errno;
901 return ret;
902 }
903
904 static int shadow_copy2_chown(vfs_handle_struct *handle, const char *fname,
905 uid_t uid, gid_t gid)
906 {
907 time_t timestamp;
908 char *stripped;
909 int ret, saved_errno;
910 char *conv;
911
912 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
913 &timestamp, &stripped)) {
914 return -1;
915 }
916 if (timestamp == 0) {
917 return SMB_VFS_NEXT_CHOWN(handle, fname, uid, gid);
918 }
919 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
920 TALLOC_FREE(stripped);
921 if (conv == NULL) {
922 return -1;
923 }
924 ret = SMB_VFS_NEXT_CHOWN(handle, conv, uid, gid);
925 saved_errno = errno;
926 TALLOC_FREE(conv);
927 errno = saved_errno;
928 return ret;
929 }
930
931 static int shadow_copy2_chdir(vfs_handle_struct *handle,
932 const char *fname)
933 {
934 time_t timestamp;
935 char *stripped;
936 int ret, saved_errno;
937 char *conv;
938
939 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
940 &timestamp, &stripped)) {
941 return -1;
942 }
943 if (timestamp == 0) {
944 return SMB_VFS_NEXT_CHDIR(handle, fname);
945 }
946 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
947 TALLOC_FREE(stripped);
948 if (conv == NULL) {
949 return -1;
950 }
951 ret = SMB_VFS_NEXT_CHDIR(handle, conv);
952 saved_errno = errno;
953 TALLOC_FREE(conv);
954 errno = saved_errno;
955 return ret;
956 }
957
958 static int shadow_copy2_ntimes(vfs_handle_struct *handle,
959 const struct smb_filename *smb_fname,
960 struct smb_file_time *ft)
961 {
962 time_t timestamp;
963 char *stripped;
964 int ret, saved_errno;
965 struct smb_filename *conv;
966
967 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
968 smb_fname->base_name,
969 &timestamp, &stripped)) {
970 return -1;
971 }
972 if (timestamp == 0) {
973 return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
974 }
975 conv = cp_smb_filename(talloc_tos(), smb_fname);
976 if (conv == NULL) {
977 errno = ENOMEM;
978 return -1;
979 }
980 conv->base_name = shadow_copy2_convert(
981 conv, handle, stripped, timestamp);
982 TALLOC_FREE(stripped);
983 if (conv->base_name == NULL) {
984 return -1;
985 }
986 ret = SMB_VFS_NEXT_NTIMES(handle, conv, ft);
987 saved_errno = errno;
988 TALLOC_FREE(conv);
989 errno = saved_errno;
990 return ret;
991 }
992
993 static int shadow_copy2_readlink(vfs_handle_struct *handle,
994 const char *fname, char *buf, size_t bufsiz)
995 {
996 time_t timestamp;
997 char *stripped;
998 int ret, saved_errno;
999 char *conv;
1000
1001 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1002 &timestamp, &stripped)) {
1003 return -1;
1004 }
1005 if (timestamp == 0) {
1006 return SMB_VFS_NEXT_READLINK(handle, fname, buf, bufsiz);
1007 }
1008 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1009 TALLOC_FREE(stripped);
1010 if (conv == NULL) {
1011 return -1;
1012 }
1013 ret = SMB_VFS_NEXT_READLINK(handle, conv, buf, bufsiz);
1014 saved_errno = errno;
1015 TALLOC_FREE(conv);
1016 errno = saved_errno;
1017 return ret;
1018 }
1019
1020 static int shadow_copy2_mknod(vfs_handle_struct *handle,
1021 const char *fname, mode_t mode, SMB_DEV_T dev)
1022 {
1023 time_t timestamp;
1024 char *stripped;
1025 int ret, saved_errno;
1026 char *conv;
1027
1028 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1029 &timestamp, &stripped)) {
1030 return -1;
1031 }
1032 if (timestamp == 0) {
1033 return SMB_VFS_NEXT_MKNOD(handle, fname, mode, dev);
1034 }
1035 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1036 TALLOC_FREE(stripped);
1037 if (conv == NULL) {
1038 return -1;
1039 }
1040 ret = SMB_VFS_NEXT_MKNOD(handle, conv, mode, dev);
1041 saved_errno = errno;
1042 TALLOC_FREE(conv);
1043 errno = saved_errno;
1044 return ret;
1045 }
1046
1047 static char *shadow_copy2_realpath(vfs_handle_struct *handle,
1048 const char *fname)
1049 {
1050 time_t timestamp;
1051 char *stripped = NULL;
1052 char *tmp = NULL;
1053 char *result = NULL;
1054 char *inserted = NULL;
1055 char *inserted_to, *inserted_end;
1056 int saved_errno;
1057
1058 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1059 &timestamp, &stripped)) {
1060 goto done;
1061 }
1062 if (timestamp == 0) {
1063 return SMB_VFS_NEXT_REALPATH(handle, fname);
1064 }
1065
1066 tmp = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1067 if (tmp == NULL) {
1068 goto done;
1069 }
1070
1071 result = SMB_VFS_NEXT_REALPATH(handle, tmp);
1072 if (result == NULL) {
1073 goto done;
1074 }
1075
1076 /*
1077 * Take away what we've inserted. This removes the @GMT-thingy
1078 * completely, but will give a path under the share root.
1079 */
1080 inserted = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
1081 if (inserted == NULL) {
1082 goto done;
1083 }
1084 inserted_to = strstr_m(result, inserted);
1085 if (inserted_to == NULL) {
1086 DEBUG(2, ("SMB_VFS_NEXT_REALPATH removed %s\n", inserted));
1087 goto done;
1088 }
1089 inserted_end = inserted_to + talloc_get_size(inserted) - 1;
1090 memmove(inserted_to, inserted_end, strlen(inserted_end)+1);
1091
1092 done:
1093 saved_errno = errno;
1094 TALLOC_FREE(inserted);
1095 TALLOC_FREE(tmp);
1096 TALLOC_FREE(stripped);
1097 errno = saved_errno;
1098 return result;
1099 }
1100
1101 /**
1102 * Check whether a given directory contains a
1103 * snapshot directory as direct subdirectory.
1104 * If yes, return the path of the snapshot-subdir,
1105 * otherwise return NULL.
1106 */
1107 static char *have_snapdir(struct vfs_handle_struct *handle,
1108 const char *path)
1109 {
1110 struct smb_filename smb_fname;
1111 int ret;
1112 struct shadow_copy2_config *config;
1113
1114 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
1115 return NULL);
1116
1117 ZERO_STRUCT(smb_fname);
1118 smb_fname.base_name = talloc_asprintf(talloc_tos(), "%s/%s",
1119 path, config->snapdir);
1120 if (smb_fname.base_name == NULL) {
1121 return NULL;
1122 }
1123
1124 ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1125 if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
1126 return smb_fname.base_name;
1127 }
1128 TALLOC_FREE(smb_fname.base_name);
1129 return NULL;
1130 }
1131
1132 /**
1133 * Find the snapshot directory (if any) for the given
1134 * filename (which is relative to the share).
1135 */
1136 static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
1137 struct vfs_handle_struct *handle,
1138 struct smb_filename *smb_fname)
1139 {
1140 char *path, *p;
1141 const char *snapdir;
1142 struct shadow_copy2_config *config;
1143
1144 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
1145 return NULL);
1146
1147 /*
1148 * If the non-snapdisrseverywhere mode, we should not search!
1149 */
1150 if (!config->snapdirseverywhere) {
1151 return config->snapshot_basepath;
1152 }
1153
1154 path = talloc_asprintf(mem_ctx, "%s/%s",
1155 handle->conn->connectpath,
1156 smb_fname->base_name);
1157 if (path == NULL) {
1158 return NULL;
1159 }
1160
1161 snapdir = have_snapdir(handle, path);
1162 if (snapdir != NULL) {
1163 TALLOC_FREE(path);
1164 return snapdir;
1165 }
1166
1167 while ((p = strrchr(path, '/')) && (p > path)) {
1168
1169 p[0] = '\0';
1170
1171 snapdir = have_snapdir(handle, path);
1172 if (snapdir != NULL) {
1173 TALLOC_FREE(path);
1174 return snapdir;
1175 }
1176 }
1177 TALLOC_FREE(path);
1178 return NULL;
1179 }
1180
1181 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1182 const char *name,
1183 char *gmt, size_t gmt_len)
1184 {
1185 struct tm timestamp;
1186 time_t timestamp_t;
1187 unsigned long int timestamp_long;
1188 const char *fmt;
1189 struct shadow_copy2_config *config;
1190
1191 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
1192 return NULL);
1193
1194 fmt = config->gmt_format;
1195
1196 ZERO_STRUCT(timestamp);
1197 if (config->use_sscanf) {
1198 if (sscanf(name, fmt, &timestamp_long) != 1) {
1199 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1200 "no sscanf match %s: %s\n",
1201 fmt, name));
1202 return false;
1203 }
1204 timestamp_t = timestamp_long;
1205 gmtime_r(&timestamp_t, &timestamp);
1206 } else {
1207 if (strptime(name, fmt, &timestamp) == NULL) {
1208 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1209 "no match %s: %s\n",
1210 fmt, name));
1211 return false;
1212 }
1213 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1214 fmt, name));
1215
1216 if (config->use_localtime) {
1217 timestamp.tm_isdst = -1;
1218 timestamp_t = mktime(&timestamp);
1219 gmtime_r(&timestamp_t, &timestamp);
1220 }
1221 }
1222
1223 strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1224 return true;
1225 }
1226
1227 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1228 {
1229 return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1230 }
1231
1232 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1233 {
1234 return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1235 }
1236
1237 /*
1238 sort the shadow copy data in ascending or descending order
1239 */
1240 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1241 struct shadow_copy_data *shadow_copy2_data)
1242 {
1243 int (*cmpfunc)(const void *, const void *);
1244 const char *sort;
1245 struct shadow_copy2_config *config;
1246
1247 SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
1248 return);
1249
1250 sort = config->sort_order;
1251 if (sort == NULL) {
1252 return;
1253 }
1254
1255 if (strcmp(sort, "asc") == 0) {
1256 cmpfunc = shadow_copy2_label_cmp_asc;
1257 } else if (strcmp(sort, "desc") == 0) {
1258 cmpfunc = shadow_copy2_label_cmp_desc;
1259 } else {
1260 return;
1261 }
1262
1263 if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
1264 shadow_copy2_data->labels)
1265 {
1266 TYPESAFE_QSORT(shadow_copy2_data->labels,
1267 shadow_copy2_data->num_volumes,
1268 cmpfunc);
1269 }
1270 }
1271
1272 static int shadow_copy2_get_shadow_copy_data(
1273 vfs_handle_struct *handle, files_struct *fsp,
1274 struct shadow_copy_data *shadow_copy2_data,
1275 bool labels)
1276 {
1277 DIR *p;
1278 const char *snapdir;
1279 struct dirent *d;
1280 TALLOC_CTX *tmp_ctx = talloc_stackframe();
1281
1282 snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
1283 if (snapdir == NULL) {
1284 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
1285 handle->conn->connectpath));
1286 errno = EINVAL;
1287 talloc_free(tmp_ctx);
1288 return -1;
1289 }
1290
1291 p = SMB_VFS_NEXT_OPENDIR(handle, snapdir, NULL, 0);
1292
1293 if (!p) {
1294 DEBUG(2,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s'"
1295 " - %s\n", snapdir, strerror(errno)));
1296 talloc_free(tmp_ctx);
1297 errno = ENOSYS;
1298 return -1;
1299 }
1300
1301 shadow_copy2_data->num_volumes = 0;
1302 shadow_copy2_data->labels = NULL;
1303
1304 while ((d = SMB_VFS_NEXT_READDIR(handle, p, NULL))) {
1305 char snapshot[GMT_NAME_LEN+1];
1306 SHADOW_COPY_LABEL *tlabels;
1307
1308 /*
1309 * ignore names not of the right form in the snapshot
1310 * directory
1311 */
1312 if (!shadow_copy2_snapshot_to_gmt(
1313 handle, d->d_name,
1314 snapshot, sizeof(snapshot))) {
1315
1316 DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
1317 "ignoring %s\n", d->d_name));
1318 continue;
1319 }
1320 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
1321 d->d_name, snapshot));
1322
1323 if (!labels) {
1324 /* the caller doesn't want the labels */
1325 shadow_copy2_data->num_volumes++;
1326 continue;
1327 }
1328
1329 tlabels = talloc_realloc(shadow_copy2_data,
1330 shadow_copy2_data->labels,
1331 SHADOW_COPY_LABEL,
1332 shadow_copy2_data->num_volumes+1);
1333 if (tlabels == NULL) {
1334 DEBUG(0,("shadow_copy2: out of memory\n"));
1335 SMB_VFS_NEXT_CLOSEDIR(handle, p);
1336 talloc_free(tmp_ctx);
1337 return -1;
1338 }
1339
1340 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
1341 sizeof(*tlabels));
1342
1343 shadow_copy2_data->num_volumes++;
1344 shadow_copy2_data->labels = tlabels;
1345 }
1346
1347 SMB_VFS_NEXT_CLOSEDIR(handle,p);
1348
1349 shadow_copy2_sort_data(handle, shadow_copy2_data);
1350
1351 talloc_free(tmp_ctx);
1352 return 0;
1353 }
1354
1355 static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
1356 struct files_struct *fsp,
1357 uint32 security_info,
1358 TALLOC_CTX *mem_ctx,
1359 struct security_descriptor **ppdesc)
1360 {
1361 time_t timestamp;
1362 char *stripped;
1363 NTSTATUS status;
1364 char *conv;
1365
1366 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1367 fsp->fsp_name->base_name,
1368 &timestamp, &stripped)) {
1369 return map_nt_error_from_unix(errno);
1370 }
1371 if (timestamp == 0) {
1372 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1373 mem_ctx,
1374 ppdesc);
1375 }
1376 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1377 TALLOC_FREE(stripped);
1378 if (conv == NULL) {
1379 return map_nt_error_from_unix(errno);
1380 }
1381 status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv, security_info,
1382 mem_ctx, ppdesc);
1383 TALLOC_FREE(conv);
1384 return status;
1385 }
1386
1387 static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
1388 const char *fname,
1389 uint32 security_info,
1390 TALLOC_CTX *mem_ctx,
1391 struct security_descriptor **ppdesc)
1392 {
1393 time_t timestamp;
1394 char *stripped;
1395 NTSTATUS status;
1396 char *conv;
1397
1398 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1399 &timestamp, &stripped)) {
1400 return map_nt_error_from_unix(errno);
1401 }
1402 if (timestamp == 0) {
1403 return SMB_VFS_NEXT_GET_NT_ACL(handle, fname, security_info,
1404 mem_ctx, ppdesc);
1405 }
1406 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1407 TALLOC_FREE(stripped);
1408 if (conv == NULL) {
1409 return map_nt_error_from_unix(errno);
1410 }
1411 status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv, security_info,
1412 mem_ctx, ppdesc);
1413 TALLOC_FREE(conv);
1414 return status;
1415 }
1416
1417 static int shadow_copy2_mkdir(vfs_handle_struct *handle,
1418 const char *fname, mode_t mode)
1419 {
1420 time_t timestamp;
1421 char *stripped;
1422 int ret, saved_errno;
1423 char *conv;
1424
1425 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1426 &timestamp, &stripped)) {
1427 return -1;
1428 }
1429 if (timestamp == 0) {
1430 return SMB_VFS_NEXT_MKDIR(handle, fname, mode);
1431 }
1432 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1433 TALLOC_FREE(stripped);
1434 if (conv == NULL) {
1435 return -1;
1436 }
1437 ret = SMB_VFS_NEXT_MKDIR(handle, conv, mode);
1438 saved_errno = errno;
1439 TALLOC_FREE(conv);
1440 errno = saved_errno;
1441 return ret;
1442 }
1443
1444 static int shadow_copy2_rmdir(vfs_handle_struct *handle, const char *fname)
1445 {
1446 time_t timestamp;
1447 char *stripped;
1448 int ret, saved_errno;
1449 char *conv;
1450
1451 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1452 &timestamp, &stripped)) {
1453 return -1;
1454 }
1455 if (timestamp == 0) {
1456 return SMB_VFS_NEXT_RMDIR(handle, fname);
1457 }
1458 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1459 TALLOC_FREE(stripped);
1460 if (conv == NULL) {
1461 return -1;
1462 }
1463 ret = SMB_VFS_NEXT_RMDIR(handle, conv);
1464 saved_errno = errno;
1465 TALLOC_FREE(conv);
1466 errno = saved_errno;
1467 return ret;
1468 }
1469
1470 static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname,
1471 unsigned int flags)
1472 {
1473 time_t timestamp;
1474 char *stripped;
1475 int ret, saved_errno;
1476 char *conv;
1477
1478 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1479 &timestamp, &stripped)) {
1480 return -1;
1481 }
1482 if (timestamp == 0) {
1483 return SMB_VFS_NEXT_CHFLAGS(handle, fname, flags);
1484 }
1485 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1486 TALLOC_FREE(stripped);
1487 if (conv == NULL) {
1488 return -1;
1489 }
1490 ret = SMB_VFS_NEXT_CHFLAGS(handle, conv, flags);
1491 saved_errno = errno;
1492 TALLOC_FREE(conv);
1493 errno = saved_errno;
1494 return ret;
1495 }
1496
1497 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
1498 const char *fname, const char *aname,
1499 void *value, size_t size)
1500 {
1501 time_t timestamp;
1502 char *stripped;
1503 ssize_t ret;
1504 int saved_errno;
1505 char *conv;
1506
1507 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1508 &timestamp, &stripped)) {
1509 return -1;
1510 }
1511 if (timestamp == 0) {
1512 return SMB_VFS_NEXT_GETXATTR(handle, fname, aname, value,
1513 size);
1514 }
1515 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1516 TALLOC_FREE(stripped);
1517 if (conv == NULL) {
1518 return -1;
1519 }
1520 ret = SMB_VFS_NEXT_GETXATTR(handle, conv, aname, value, size);
1521 saved_errno = errno;
1522 TALLOC_FREE(conv);
1523 errno = saved_errno;
1524 return ret;
1525 }
1526
1527 static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
1528 const char *fname,
1529 char *list, size_t size)
1530 {
1531 time_t timestamp;
1532 char *stripped;
1533 ssize_t ret;
1534 int saved_errno;
1535 char *conv;
1536
1537 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1538 &timestamp, &stripped)) {
1539 return -1;
1540 }
1541 if (timestamp == 0) {
1542 return SMB_VFS_NEXT_LISTXATTR(handle, fname, list, size);
1543 }
1544 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1545 TALLOC_FREE(stripped);
1546 if (conv == NULL) {
1547 return -1;
1548 }
1549 ret = SMB_VFS_NEXT_LISTXATTR(handle, conv, list, size);
1550 saved_errno = errno;
1551 TALLOC_FREE(conv);
1552 errno = saved_errno;
1553 return ret;
1554 }
1555
1556 static int shadow_copy2_removexattr(vfs_handle_struct *handle,
1557 const char *fname, const char *aname)
1558 {
1559 time_t timestamp;
1560 char *stripped;
1561 int ret, saved_errno;
1562 char *conv;
1563
1564 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1565 &timestamp, &stripped)) {
1566 return -1;
1567 }
1568 if (timestamp == 0) {
1569 return SMB_VFS_NEXT_REMOVEXATTR(handle, fname, aname);
1570 }
1571 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1572 TALLOC_FREE(stripped);
1573 if (conv == NULL) {
1574 return -1;
1575 }
1576 ret = SMB_VFS_NEXT_REMOVEXATTR(handle, conv, aname);
1577 saved_errno = errno;
1578 TALLOC_FREE(conv);
1579 errno = saved_errno;
1580 return ret;
1581 }
1582
1583 static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
1584 const char *fname,
1585 const char *aname, const void *value,
1586 size_t size, int flags)
1587 {
1588 time_t timestamp;
1589 char *stripped;
1590 ssize_t ret;
1591 int saved_errno;
1592 char *conv;
1593
1594 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1595 &timestamp, &stripped)) {
1596 return -1;
1597 }
1598 if (timestamp == 0) {
1599 return SMB_VFS_NEXT_SETXATTR(handle, fname, aname, value, size,
1600 flags);
1601 }
1602 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1603 TALLOC_FREE(stripped);
1604 if (conv == NULL) {
1605 return -1;
1606 }
1607 ret = SMB_VFS_NEXT_SETXATTR(handle, conv, aname, value, size, flags);
1608 saved_errno = errno;
1609 TALLOC_FREE(conv);
1610 errno = saved_errno;
1611 return ret;
1612 }
1613
1614 static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
1615 const char *fname, mode_t mode)
1616 {
1617 time_t timestamp;
1618 char *stripped;
1619 ssize_t ret;
1620 int saved_errno;
1621 char *conv;
1622
1623 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1624 &timestamp, &stripped)) {
1625 return -1;
1626 }
1627 if (timestamp == 0) {
1628 return SMB_VFS_NEXT_CHMOD_ACL(handle, fname, mode);
1629 }
1630 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1631 TALLOC_FREE(stripped);
1632 if (conv == NULL) {
1633 return -1;
1634 }
1635 ret = SMB_VFS_NEXT_CHMOD_ACL(handle, conv, mode);
1636 saved_errno = errno;
1637 TALLOC_FREE(conv);
1638 errno = saved_errno;
1639 return ret;
1640 }
1641
1642 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
1643 const char *path,
1644 const char *name,
1645 TALLOC_CTX *mem_ctx,
1646 char **found_name)
1647 {
1648 time_t timestamp;
1649 char *stripped;
1650 ssize_t ret;
1651 int saved_errno;
1652 char *conv;
1653
1654 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
1655 &timestamp, &stripped)) {
1656 return -1;
1657 }
1658 if (timestamp == 0) {
1659 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
1660 mem_ctx, found_name);
1661 }
1662 if (stripped[0] == '\0') {
1663 *found_name = talloc_strdup(mem_ctx, name);
1664 if (*found_name == NULL) {
1665 errno = ENOMEM;
1666 return -1;
1667 }
1668 return 0;
1669 }
1670 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1671 TALLOC_FREE(stripped);
1672 if (conv == NULL) {
1673 return -1;
1674 }
1675 ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
1676 mem_ctx, found_name);
1677 saved_errno = errno;
1678 TALLOC_FREE(conv);
1679 errno = saved_errno;
1680 return ret;
1681 }
1682
1683 static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
1684 const char *path, bool small_query,
1685 uint64_t *bsize, uint64_t *dfree,
1686 uint64_t *dsize)
1687 {
1688 time_t timestamp;
1689 char *stripped;
1690 ssize_t ret;
1691 int saved_errno;
1692 char *conv;
1693
1694 if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
1695 &timestamp, &stripped)) {
1696 return -1;
1697 }
1698 if (timestamp == 0) {
1699 return SMB_VFS_NEXT_DISK_FREE(handle, path, small_query,
1700 bsize, dfree, dsize);
1701 }
1702
1703 conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1704 TALLOC_FREE(stripped);
1705 if (conv == NULL) {
1706 return -1;
1707 }
1708
1709 ret = SMB_VFS_NEXT_DISK_FREE(handle, conv, small_query, bsize, dfree,
1710 dsize);
1711
1712 saved_errno = errno;
1713 TALLOC_FREE(conv);
1714 errno = saved_errno;
1715
1716 return ret;
1717 }
1718
1719 static int shadow_copy2_connect(struct vfs_handle_struct *handle,
1720 const char *service, const char *user)
1721 {
1722 struct shadow_copy2_config *config;
1723 int ret;
1724 const char *snapdir;
1725 const char *gmt_format;
1726 const char *sort_order;
1727 const char *basedir;
1728 const char *mount_point;
1729
1730 DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
1731 (unsigned)handle->conn->cnum,
1732 handle->conn->connectpath));
1733
1734 ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
1735 if (ret < 0) {
1736 return ret;
1737 }
1738
1739 config = talloc_zero(handle->conn, struct shadow_copy2_config);
1740 if (config == NULL) {
1741 DEBUG(0, ("talloc_zero() failed\n"));
1742 errno = ENOMEM;
1743 return -1;
1744 }
1745
1746 gmt_format = lp_parm_const_string(SNUM(handle->conn),
1747 "shadow", "format",
1748 GMT_FORMAT);
1749 config->gmt_format = talloc_strdup(config, gmt_format);
1750 if (config->gmt_format == NULL) {
1751 DEBUG(0, ("talloc_strdup() failed\n"));
1752 errno = ENOMEM;
1753 return -1;
1754 }
1755
1756 config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
1757 "shadow", "sscanf", false);
1758
1759 config->use_localtime = lp_parm_bool(SNUM(handle->conn),
1760 "shadow", "localtime",
1761 false);
1762
1763 snapdir = lp_parm_const_string(SNUM(handle->conn),
1764 "shadow", "snapdir",
1765 ".snapshots");
1766 config->snapdir = talloc_strdup(config, snapdir);
1767 if (config->snapdir == NULL) {
1768 DEBUG(0, ("talloc_strdup() failed\n"));
1769 errno = ENOMEM;
1770 return -1;
1771 }
1772
1773 config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
1774 "shadow",
1775 "snapdirseverywhere",
1776 false);
1777
1778 config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
1779 "shadow", "crossmountpoints",
1780 false);
1781
1782 config->fixinodes = lp_parm_bool(SNUM(handle->conn),
1783 "shadow", "fixinodes",
1784 false);
1785
1786 sort_order = lp_parm_const_string(SNUM(handle->conn),
1787 "shadow", "sort", "desc");
1788 config->sort_order = talloc_strdup(config, sort_order);
1789 if (config->sort_order == NULL) {
1790 DEBUG(0, ("talloc_strdup() failed\n"));
1791 errno = ENOMEM;
1792 return -1;
1793 }
1794
1795 mount_point = lp_parm_const_string(SNUM(handle->conn),
1796 "shadow", "mountpoint", NULL);
1797 if (mount_point != NULL) {
1798 if (mount_point[0] != '/') {
1799 DEBUG(1, (__location__ " Warning: 'mountpoint' is "
1800 "relative ('%s'), but it has to be an "
1801 "absolute path. Ignoring provided value.\n",
1802 mount_point));
1803 mount_point = NULL;
1804 } else {
1805 char *p;
1806 p = strstr(handle->conn->connectpath, mount_point);
1807 if (p != handle->conn->connectpath) {
1808 DEBUG(1, ("Warning: mount_point (%s) is not a "
1809 "subdirectory of the share root "
1810 "(%s). Ignoring provided value.\n",
1811 mount_point,
1812 handle->conn->connectpath));
1813 mount_point = NULL;
1814 }
1815 }
1816 }
1817
1818 if (mount_point != NULL) {
1819 config->mount_point = talloc_strdup(config, mount_point);
1820 if (config->mount_point == NULL) {
1821 DEBUG(0, (__location__ " talloc_strdup() failed\n"));
1822 return -1;
1823 }
1824 } else {
1825 config->mount_point = shadow_copy2_find_mount_point(config,
1826 handle);
1827 if (config->mount_point == NULL) {
1828 DEBUG(0, (__location__ ": shadow_copy2_find_mount_point"
1829 " failed: %s\n", strerror(errno)));
1830 return -1;
1831 }
1832 }
1833
1834 basedir = lp_parm_const_string(SNUM(handle->conn),
1835 "shadow", "basedir", NULL);
1836
1837 if (basedir != NULL) {
1838 if (basedir[0] != '/') {
1839 DEBUG(1, (__location__ " Warning: 'basedir' is "
1840 "relative ('%s'), but it has to be an "
1841 "absolute path. Disabling basedir.\n",
1842 basedir));
1843 } else {
1844 char *p;
1845 p = strstr(basedir, config->mount_point);
1846 if (p != basedir) {
1847 DEBUG(1, ("Warning: basedir (%s) is not a "
1848 "subdirectory of the share root's "
1849 "mount point (%s). "
1850 "Disabling basedir\n",
1851 basedir, config->mount_point));
1852 } else {
1853 config->basedir = talloc_strdup(config,
1854 basedir);
1855 if (config->basedir == NULL) {
1856 DEBUG(0, ("talloc_strdup() failed\n"));
1857 errno = ENOMEM;
1858 return -1;
1859 }
1860 }
1861 }
1862 }
1863
1864 if (config->snapdirseverywhere && config->basedir != NULL) {
1865 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
1866 "with 'snapdirseverywhere'. Disabling basedir.\n"));
1867 TALLOC_FREE(config->basedir);
1868 }
1869
1870 if (config->crossmountpoints && config->basedir != NULL) {
1871 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
1872 "with 'crossmountpoints'. Disabling basedir.\n"));
1873 TALLOC_FREE(config->basedir);
1874 }
1875
1876 if (config->basedir == NULL) {
1877 config->basedir = config->mount_point;
1878 }
1879
1880 if (strlen(config->basedir) != strlen(handle->conn->connectpath)) {
1881 config->rel_connectpath = talloc_strdup(config,
1882 handle->conn->connectpath + strlen(config->basedir));
1883 if (config->rel_connectpath == NULL) {
1884 DEBUG(0, ("talloc_strdup() failed\n"));
1885 errno = ENOMEM;
1886 return -1;
1887 }
1888 }
1889
1890 if (config->snapdir[0] == '/') {
1891 config->snapdir_absolute = true;
1892
1893 if (config->snapdirseverywhere == true) {
1894 DEBUG(1, (__location__ " Warning: An absolute snapdir "
1895 "is incompatible with 'snapdirseverywhere', "
1896 "setting 'snapdirseverywhere' to false.\n"));
1897 config->snapdirseverywhere = false;
1898 }
1899
1900 if (config->crossmountpoints == true) {
1901 DEBUG(1, (__location__ " Warning: 'crossmountpoints' "
1902 "is not supported with an absolute snapdir. "
1903 "Disabling it.\n"));
1904 config->crossmountpoints = false;
1905 }
1906
1907 config->snapshot_basepath = config->snapdir;
1908 } else {
1909 config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
1910 config->mount_point, config->snapdir);
1911 if (config->snapshot_basepath == NULL) {
1912 DEBUG(0, ("talloc_asprintf() failed\n"));
1913 errno = ENOMEM;
1914 return -1;
1915 }
1916 }
1917
1918 DEBUG(10, ("shadow_copy2_connect: configuration:\n"
1919 " share root: '%s'\n"
1920 " basedir: '%s'\n"
1921 " mountpoint: '%s'\n"
1922 " rel share root: '%s'\n"
1923 " snapdir: '%s'\n"
1924 " snapshot base path: '%s'\n"
1925 " format: '%s'\n"
1926 " use sscanf: %s\n"
1927 " snapdirs everywhere: %s\n"
1928 " cross mountpoints: %s\n"
1929 " fix inodes: %s\n"
1930 " sort order: %s\n"
1931 "",
1932 handle->conn->connectpath,
1933 config->basedir,
1934 config->mount_point,
1935 config->rel_connectpath,
1936 config->snapdir,
1937 config->snapshot_basepath,
1938 config->gmt_format,
1939 config->use_sscanf ? "yes" : "no",
1940 config->snapdirseverywhere ? "yes" : "no",
1941 config->crossmountpoints ? "yes" : "no",
1942 config->fixinodes ? "yes" : "no",
1943 config->sort_order
1944 ));
1945
1946
1947 SMB_VFS_HANDLE_SET_DATA(handle, config,
1948 NULL, struct shadow_copy2_config,
1949 return -1);
1950
1951 return 0;
1952 }
1953
1954 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
1955 .connect_fn = shadow_copy2_connect,
1956 .opendir_fn = shadow_copy2_opendir,
1957 .disk_free_fn = shadow_copy2_disk_free,
1958 .rename_fn = shadow_copy2_rename,
1959 .link_fn = shadow_copy2_link,
1960 .symlink_fn = shadow_copy2_symlink,
1961 .stat_fn = shadow_copy2_stat,
1962 .lstat_fn = shadow_copy2_lstat,
1963 .fstat_fn = shadow_copy2_fstat,
1964 .open_fn = shadow_copy2_open,
1965 .unlink_fn = shadow_copy2_unlink,
1966 .chmod_fn = shadow_copy2_chmod,
1967 .chown_fn = shadow_copy2_chown,
1968 .chdir_fn = shadow_copy2_chdir,
1969 .ntimes_fn = shadow_copy2_ntimes,
1970 .readlink_fn = shadow_copy2_readlink,
1971 .mknod_fn = shadow_copy2_mknod,
1972 .realpath_fn = shadow_copy2_realpath,
1973 .get_nt_acl_fn = shadow_copy2_get_nt_acl,
1974 .fget_nt_acl_fn = shadow_copy2_fget_nt_acl,
1975 .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
1976 .mkdir_fn = shadow_copy2_mkdir,
1977 .rmdir_fn = shadow_copy2_rmdir,
1978 .getxattr_fn = shadow_copy2_getxattr,
1979 .listxattr_fn = shadow_copy2_listxattr,
1980 .removexattr_fn = shadow_copy2_removexattr,
1981 .setxattr_fn = shadow_copy2_setxattr,
1982 .chmod_acl_fn = shadow_copy2_chmod_acl,
1983 .chflags_fn = shadow_copy2_chflags,
1984 .get_real_filename_fn = shadow_copy2_get_real_filename,
1985 };
1986
1987 NTSTATUS vfs_shadow_copy2_init(void);
1988 NTSTATUS vfs_shadow_copy2_init(void)
1989 {
1990 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
1991 "shadow_copy2", &vfs_shadow_copy2_fns);
1992 }
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