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kcc: Add corresponding methods for repsTo
[Samba.git] / source3 / modules / vfs_streams_depot.c
blob83c9d9743ae8262c6f0be4792f1f3ce4e35f68e4
1 /*
2 * Store streams in a separate subdirectory
3 *
4 * Copyright (C) Volker Lendecke, 2007
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "includes.h"
21 #include "smbd/smbd.h"
22 #include "system/filesys.h"
23
24 #undef DBGC_CLASS
25 #define DBGC_CLASS DBGC_VFS
26
27 /*
28 * Excerpt from a mail from tridge:
29 *
30 * Volker, what I'm thinking of is this:
31 * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream1
32 * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream2
33 *
34 * where XX/YY is a 2 level hash based on the fsid/inode. "aaaa.bbbb"
35 * is the fsid/inode. "namedstreamX" is a file named after the stream
36 * name.
37 */
38
39 static uint32_t hash_fn(DATA_BLOB key)
40 {
41 uint32_t value; /* Used to compute the hash value. */
42 uint32_t i; /* Used to cycle through random values. */
43
44 /* Set the initial value from the key size. */
45 for (value = 0x238F13AF * key.length, i=0; i < key.length; i++)
46 value = (value + (key.data[i] << (i*5 % 24)));
47
48 return (1103515243 * value + 12345);
49 }
50
51 /*
52 * With the hashing scheme based on the inode we need to protect against
53 * streams showing up on files with re-used inodes. This can happen if we
54 * create a stream directory from within Samba, and a local process or NFS
55 * client deletes the file without deleting the streams directory. When the
56 * inode is re-used and the stream directory is still around, the streams in
57 * there would be show up as belonging to the new file.
58 *
59 * There are several workarounds for this, probably the easiest one is on
60 * systems which have a true birthtime stat element: When the file has a later
61 * birthtime than the streams directory, then we have to recreate the
62 * directory.
63 *
64 * The other workaround is to somehow mark the file as generated by Samba with
65 * something that a NFS client would not do. The closest one is a special
66 * xattr value being set. On systems which do not support xattrs, it might be
67 * an option to put in a special ACL entry for a non-existing group.
68 */
69
70 static bool file_is_valid(vfs_handle_struct *handle, const char *path)
71 {
72 char buf;
73
74 DEBUG(10, ("file_is_valid (%s) called\n", path));
75
76 if (SMB_VFS_GETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
77 &buf, sizeof(buf)) != sizeof(buf)) {
78 DEBUG(10, ("GETXATTR failed: %s\n", strerror(errno)));
79 return false;
80 }
81
82 if (buf != '1') {
83 DEBUG(10, ("got wrong buffer content: '%c'\n", buf));
84 return false;
85 }
86
87 return true;
88 }
89
90 static bool mark_file_valid(vfs_handle_struct *handle, const char *path)
91 {
92 char buf = '1';
93 int ret;
94
95 DEBUG(10, ("marking file %s as valid\n", path));
96
97 ret = SMB_VFS_SETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
98 &buf, sizeof(buf), 0);
99
100 if (ret == -1) {
101 DEBUG(10, ("SETXATTR failed: %s\n", strerror(errno)));
102 return false;
103 }
104
105 return true;
106 }
107
108 /**
109 * Given an smb_filename, determine the stream directory using the file's
110 * base_name.
111 */
112 static char *stream_dir(vfs_handle_struct *handle,
113 const struct smb_filename *smb_fname,
114 const SMB_STRUCT_STAT *base_sbuf, bool create_it)
115 {
116 uint32_t hash;
117 struct smb_filename *smb_fname_hash = NULL;
118 char *result = NULL;
119 SMB_STRUCT_STAT base_sbuf_tmp;
120 uint8_t first, second;
121 char *tmp;
122 char *id_hex;
123 struct file_id id;
124 uint8_t id_buf[16];
125 bool check_valid;
126 char *rootdir = NULL;
127 struct smb_filename *rootdir_fname = NULL;
128 struct smb_filename *tmp_fname = NULL;
129
130 check_valid = lp_parm_bool(SNUM(handle->conn),
131 "streams_depot", "check_valid", true);
132
133 tmp = talloc_asprintf(talloc_tos(), "%s/.streams", handle->conn->cwd);
134
135 if (tmp == NULL) {
136 errno = ENOMEM;
137 goto fail;
138 }
139
140 rootdir = lp_parm_talloc_string(talloc_tos(),
141 SNUM(handle->conn), "streams_depot", "directory",
142 tmp);
143 if (rootdir == NULL) {
144 errno = ENOMEM;
145 goto fail;
146 }
147
148 rootdir_fname = synthetic_smb_fname(talloc_tos(),
149 rootdir,
150 NULL,
151 NULL,
152 smb_fname->flags);
153 if (rootdir_fname == NULL) {
154 errno = ENOMEM;
155 goto fail;
156 }
157
158 /* Stat the base file if it hasn't already been done. */
159 if (base_sbuf == NULL) {
160 struct smb_filename *smb_fname_base;
161
162 smb_fname_base = synthetic_smb_fname(
163 talloc_tos(),
164 smb_fname->base_name,
165 NULL,
166 NULL,
167 smb_fname->flags);
168 if (smb_fname_base == NULL) {
169 errno = ENOMEM;
170 goto fail;
171 }
172 if (SMB_VFS_NEXT_STAT(handle, smb_fname_base) == -1) {
173 TALLOC_FREE(smb_fname_base);
174 goto fail;
175 }
176 base_sbuf_tmp = smb_fname_base->st;
177 TALLOC_FREE(smb_fname_base);
178 } else {
179 base_sbuf_tmp = *base_sbuf;
180 }
181
182 id = SMB_VFS_FILE_ID_CREATE(handle->conn, &base_sbuf_tmp);
183
184 push_file_id_16((char *)id_buf, &id);
185
186 hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
187
188 first = hash & 0xff;
189 second = (hash >> 8) & 0xff;
190
191 id_hex = hex_encode_talloc(talloc_tos(), id_buf, sizeof(id_buf));
192
193 if (id_hex == NULL) {
194 errno = ENOMEM;
195 goto fail;
196 }
197
198 result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
199 first, second, id_hex);
200
201 TALLOC_FREE(id_hex);
202
203 if (result == NULL) {
204 errno = ENOMEM;
205 return NULL;
206 }
207
208 smb_fname_hash = synthetic_smb_fname(talloc_tos(),
209 result,
210 NULL,
211 NULL,
212 smb_fname->flags);
213 if (smb_fname_hash == NULL) {
214 errno = ENOMEM;
215 goto fail;
216 }
217
218 if (SMB_VFS_NEXT_STAT(handle, smb_fname_hash) == 0) {
219 struct smb_filename *smb_fname_new = NULL;
220 char *newname;
221 bool delete_lost;
222
223 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
224 errno = EINVAL;
225 goto fail;
226 }
227
228 if (!check_valid ||
229 file_is_valid(handle, smb_fname->base_name)) {
230 return result;
231 }
232
233 /*
234 * Someone has recreated a file under an existing inode
235 * without deleting the streams directory.
236 * Move it away or remove if streams_depot:delete_lost is set.
237 */
238
239 again:
240 delete_lost = lp_parm_bool(SNUM(handle->conn), "streams_depot",
241 "delete_lost", false);
242
243 if (delete_lost) {
244 DEBUG(3, ("Someone has recreated a file under an "
245 "existing inode. Removing: %s\n",
246 smb_fname_hash->base_name));
247 recursive_rmdir(talloc_tos(), handle->conn,
248 smb_fname_hash);
249 SMB_VFS_NEXT_RMDIR(handle, smb_fname_hash);
250 } else {
251 newname = talloc_asprintf(talloc_tos(), "lost-%lu",
252 random());
253 DEBUG(3, ("Someone has recreated a file under an "
254 "existing inode. Renaming: %s to: %s\n",
255 smb_fname_hash->base_name,
256 newname));
257 if (newname == NULL) {
258 errno = ENOMEM;
259 goto fail;
260 }
261
262 smb_fname_new = synthetic_smb_fname(
263 talloc_tos(),
264 newname,
265 NULL,
266 NULL,
267 smb_fname->flags);
268 TALLOC_FREE(newname);
269 if (smb_fname_new == NULL) {
270 errno = ENOMEM;
271 goto fail;
272 }
273
274 if (SMB_VFS_NEXT_RENAME(handle, smb_fname_hash,
275 smb_fname_new) == -1) {
276 TALLOC_FREE(smb_fname_new);
277 if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
278 goto again;
279 }
280 goto fail;
281 }
282
283 TALLOC_FREE(smb_fname_new);
284 }
285 }
286
287 if (!create_it) {
288 errno = ENOENT;
289 goto fail;
290 }
291
292 if ((SMB_VFS_NEXT_MKDIR(handle, rootdir_fname, 0755) != 0)
293 && (errno != EEXIST)) {
294 goto fail;
295 }
296
297 tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
298 if (tmp == NULL) {
299 errno = ENOMEM;
300 goto fail;
301 }
302
303 tmp_fname = synthetic_smb_fname(talloc_tos(),
304 tmp,
305 NULL,
306 NULL,
307 smb_fname->flags);
308 if (tmp_fname == NULL) {
309 errno = ENOMEM;
310 goto fail;
311 }
312
313 if ((SMB_VFS_NEXT_MKDIR(handle, tmp_fname, 0755) != 0)
314 && (errno != EEXIST)) {
315 goto fail;
316 }
317
318 TALLOC_FREE(tmp);
319 TALLOC_FREE(tmp_fname);
320
321 tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
322 second);
323 if (tmp == NULL) {
324 errno = ENOMEM;
325 goto fail;
326 }
327
328 tmp_fname = synthetic_smb_fname(talloc_tos(),
329 tmp,
330 NULL,
331 NULL,
332 smb_fname->flags);
333 if (tmp_fname == NULL) {
334 errno = ENOMEM;
335 goto fail;
336 }
337
338 if ((SMB_VFS_NEXT_MKDIR(handle, tmp_fname, 0755) != 0)
339 && (errno != EEXIST)) {
340 goto fail;
341 }
342
343 TALLOC_FREE(tmp);
344 TALLOC_FREE(tmp_fname);
345
346 /* smb_fname_hash is the struct smb_filename version of 'result' */
347 if ((SMB_VFS_NEXT_MKDIR(handle, smb_fname_hash, 0755) != 0)
348 && (errno != EEXIST)) {
349 goto fail;
350 }
351
352 if (check_valid && !mark_file_valid(handle, smb_fname->base_name)) {
353 goto fail;
354 }
355
356 TALLOC_FREE(rootdir_fname);
357 TALLOC_FREE(rootdir);
358 TALLOC_FREE(tmp_fname);
359 TALLOC_FREE(smb_fname_hash);
360 return result;
361
362 fail:
363 TALLOC_FREE(rootdir_fname);
364 TALLOC_FREE(rootdir);
365 TALLOC_FREE(tmp_fname);
366 TALLOC_FREE(smb_fname_hash);
367 TALLOC_FREE(result);
368 return NULL;
369 }
370 /**
371 * Given a stream name, populate smb_fname_out with the actual location of the
372 * stream.
373 */
374 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
375 const struct smb_filename *smb_fname,
376 struct smb_filename **smb_fname_out,
377 bool create_dir)
378 {
379 char *dirname, *stream_fname;
380 const char *stype;
381 NTSTATUS status;
382
383 *smb_fname_out = NULL;
384
385 stype = strchr_m(smb_fname->stream_name + 1, ':');
386
387 if (stype) {
388 if (strcasecmp_m(stype, ":$DATA") != 0) {
389 return NT_STATUS_INVALID_PARAMETER;
390 }
391 }
392
393 dirname = stream_dir(handle, smb_fname, NULL, create_dir);
394
395 if (dirname == NULL) {
396 status = map_nt_error_from_unix(errno);
397 goto fail;
398 }
399
400 stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
401 smb_fname->stream_name);
402
403 if (stream_fname == NULL) {
404 status = NT_STATUS_NO_MEMORY;
405 goto fail;
406 }
407
408 if (stype == NULL) {
409 /* Append an explicit stream type if one wasn't specified. */
410 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
411 stream_fname);
412 if (stream_fname == NULL) {
413 status = NT_STATUS_NO_MEMORY;
414 goto fail;
415 }
416 } else {
417 /* Normalize the stream type to upercase. */
418 if (!strupper_m(strrchr_m(stream_fname, ':') + 1)) {
419 status = NT_STATUS_INVALID_PARAMETER;
420 goto fail;
421 }
422 }
423
424 DEBUG(10, ("stream filename = %s\n", stream_fname));
425
426 /* Create an smb_filename with stream_name == NULL. */
427 *smb_fname_out = synthetic_smb_fname(talloc_tos(),
428 stream_fname,
429 NULL,
430 NULL,
431 smb_fname->flags);
432 if (*smb_fname_out == NULL) {
433 return NT_STATUS_NO_MEMORY;
434 }
435
436 return NT_STATUS_OK;
437
438 fail:
439 DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
440 TALLOC_FREE(*smb_fname_out);
441 return status;
442 }
443
444 static NTSTATUS walk_streams(vfs_handle_struct *handle,
445 struct smb_filename *smb_fname_base,
446 char **pdirname,
447 bool (*fn)(const char *dirname,
448 const char *dirent,
449 void *private_data),
450 void *private_data)
451 {
452 char *dirname;
453 struct smb_filename *dir_smb_fname = NULL;
454 DIR *dirhandle = NULL;
455 const char *dirent = NULL;
456 char *talloced = NULL;
457
458 dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
459 false);
460
461 if (dirname == NULL) {
462 if (errno == ENOENT) {
463 /*
464 * no stream around
465 */
466 return NT_STATUS_OK;
467 }
468 return map_nt_error_from_unix(errno);
469 }
470
471 DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
472
473 dir_smb_fname = synthetic_smb_fname(talloc_tos(),
474 dirname,
475 NULL,
476 NULL,
477 smb_fname_base->flags);
478 if (dir_smb_fname == NULL) {
479 TALLOC_FREE(dirname);
480 return NT_STATUS_NO_MEMORY;
481 }
482
483 dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dir_smb_fname, NULL, 0);
484
485 TALLOC_FREE(dir_smb_fname);
486
487 if (dirhandle == NULL) {
488 TALLOC_FREE(dirname);
489 return map_nt_error_from_unix(errno);
490 }
491
492 while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
493 &talloced)) != NULL) {
494
495 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
496 TALLOC_FREE(talloced);
497 continue;
498 }
499
500 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
501
502 if (!fn(dirname, dirent, private_data)) {
503 TALLOC_FREE(talloced);
504 break;
505 }
506 TALLOC_FREE(talloced);
507 }
508
509 SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
510
511 if (pdirname != NULL) {
512 *pdirname = dirname;
513 }
514 else {
515 TALLOC_FREE(dirname);
516 }
517
518 return NT_STATUS_OK;
519 }
520
521 /**
522 * Helper to stat/lstat the base file of an smb_fname. This will actually
523 * fills in the stat struct in smb_filename.
524 */
525 static int streams_depot_stat_base(vfs_handle_struct *handle,
526 struct smb_filename *smb_fname,
527 bool follow_links)
528 {
529 char *tmp_stream_name;
530 int result;
531
532 tmp_stream_name = smb_fname->stream_name;
533 smb_fname->stream_name = NULL;
534 if (follow_links) {
535 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
536 } else {
537 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
538 }
539 smb_fname->stream_name = tmp_stream_name;
540 return result;
541 }
542
543 static int streams_depot_stat(vfs_handle_struct *handle,
544 struct smb_filename *smb_fname)
545 {
546 struct smb_filename *smb_fname_stream = NULL;
547 NTSTATUS status;
548 int ret = -1;
549
550 DEBUG(10, ("streams_depot_stat called for [%s]\n",
551 smb_fname_str_dbg(smb_fname)));
552
553 if (!is_ntfs_stream_smb_fname(smb_fname)) {
554 return SMB_VFS_NEXT_STAT(handle, smb_fname);
555 }
556
557 /* If the default stream is requested, just stat the base file. */
558 if (is_ntfs_default_stream_smb_fname(smb_fname)) {
559 return streams_depot_stat_base(handle, smb_fname, true);
560 }
561
562 /* Stat the actual stream now. */
563 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
564 false);
565 if (!NT_STATUS_IS_OK(status)) {
566 ret = -1;
567 errno = map_errno_from_nt_status(status);
568 goto done;
569 }
570
571 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
572
573 /* Update the original smb_fname with the stat info. */
574 smb_fname->st = smb_fname_stream->st;
575 done:
576 TALLOC_FREE(smb_fname_stream);
577 return ret;
578 }
579
580
581
582 static int streams_depot_lstat(vfs_handle_struct *handle,
583 struct smb_filename *smb_fname)
584 {
585 struct smb_filename *smb_fname_stream = NULL;
586 NTSTATUS status;
587 int ret = -1;
588
589 DEBUG(10, ("streams_depot_lstat called for [%s]\n",
590 smb_fname_str_dbg(smb_fname)));
591
592 if (!is_ntfs_stream_smb_fname(smb_fname)) {
593 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
594 }
595
596 /* If the default stream is requested, just stat the base file. */
597 if (is_ntfs_default_stream_smb_fname(smb_fname)) {
598 return streams_depot_stat_base(handle, smb_fname, false);
599 }
600
601 /* Stat the actual stream now. */
602 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
603 false);
604 if (!NT_STATUS_IS_OK(status)) {
605 ret = -1;
606 errno = map_errno_from_nt_status(status);
607 goto done;
608 }
609
610 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
611
612 done:
613 TALLOC_FREE(smb_fname_stream);
614 return ret;
615 }
616
617 static int streams_depot_open(vfs_handle_struct *handle,
618 struct smb_filename *smb_fname,
619 files_struct *fsp, int flags, mode_t mode)
620 {
621 struct smb_filename *smb_fname_stream = NULL;
622 struct smb_filename *smb_fname_base = NULL;
623 NTSTATUS status;
624 int ret = -1;
625
626 if (!is_ntfs_stream_smb_fname(smb_fname)) {
627 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
628 }
629
630 /* If the default stream is requested, just open the base file. */
631 if (is_ntfs_default_stream_smb_fname(smb_fname)) {
632 char *tmp_stream_name;
633
634 tmp_stream_name = smb_fname->stream_name;
635 smb_fname->stream_name = NULL;
636 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
637 smb_fname->stream_name = tmp_stream_name;
638
639 return ret;
640 }
641
642 /* Ensure the base file still exists. */
643 smb_fname_base = synthetic_smb_fname(talloc_tos(),
644 smb_fname->base_name,
645 NULL,
646 NULL,
647 smb_fname->flags);
648 if (smb_fname_base == NULL) {
649 ret = -1;
650 errno = ENOMEM;
651 goto done;
652 }
653
654 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
655 if (ret == -1) {
656 goto done;
657 }
658
659 /* Determine the stream name, and then open it. */
660 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
661 if (!NT_STATUS_IS_OK(status)) {
662 ret = -1;
663 errno = map_errno_from_nt_status(status);
664 goto done;
665 }
666
667 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
668
669 done:
670 TALLOC_FREE(smb_fname_stream);
671 TALLOC_FREE(smb_fname_base);
672 return ret;
673 }
674
675 static int streams_depot_unlink(vfs_handle_struct *handle,
676 const struct smb_filename *smb_fname)
677 {
678 struct smb_filename *smb_fname_base = NULL;
679 int ret = -1;
680
681 DEBUG(10, ("streams_depot_unlink called for %s\n",
682 smb_fname_str_dbg(smb_fname)));
683
684 /* If there is a valid stream, just unlink the stream and return. */
685 if (is_ntfs_stream_smb_fname(smb_fname) &&
686 !is_ntfs_default_stream_smb_fname(smb_fname)) {
687 struct smb_filename *smb_fname_stream = NULL;
688 NTSTATUS status;
689
690 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
691 false);
692 if (!NT_STATUS_IS_OK(status)) {
693 errno = map_errno_from_nt_status(status);
694 return -1;
695 }
696
697 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
698
699 TALLOC_FREE(smb_fname_stream);
700 return ret;
701 }
702
703 /*
704 * We potentially need to delete the per-inode streams directory
705 */
706
707 smb_fname_base = synthetic_smb_fname(talloc_tos(),
708 smb_fname->base_name,
709 NULL,
710 NULL,
711 smb_fname->flags);
712 if (smb_fname_base == NULL) {
713 errno = ENOMEM;
714 return -1;
715 }
716
717 if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
718 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
719 } else {
720 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
721 }
722
723 if (ret == -1) {
724 TALLOC_FREE(smb_fname_base);
725 return -1;
726 }
727
728 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
729 if (ret == 0) {
730 char *dirname = stream_dir(handle, smb_fname_base,
731 &smb_fname_base->st, false);
732
733 if (dirname != NULL) {
734 struct smb_filename *smb_fname_dir =
735 synthetic_smb_fname(talloc_tos(),
736 dirname,
737 NULL,
738 NULL,
739 smb_fname->flags);
740 if (smb_fname_dir == NULL) {
741 TALLOC_FREE(smb_fname_base);
742 TALLOC_FREE(dirname);
743 errno = ENOMEM;
744 return -1;
745 }
746 SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
747 TALLOC_FREE(smb_fname_dir);
748 }
749 TALLOC_FREE(dirname);
750 }
751
752 TALLOC_FREE(smb_fname_base);
753 return ret;
754 }
755
756 static int streams_depot_rmdir(vfs_handle_struct *handle,
757 const struct smb_filename *smb_fname)
758 {
759 struct smb_filename *smb_fname_base = NULL;
760 int ret = -1;
761
762 DEBUG(10, ("streams_depot_rmdir called for %s\n",
763 smb_fname->base_name));
764
765 /*
766 * We potentially need to delete the per-inode streams directory
767 */
768
769 smb_fname_base = synthetic_smb_fname(talloc_tos(),
770 smb_fname->base_name,
771 NULL,
772 NULL,
773 smb_fname->flags);
774 if (smb_fname_base == NULL) {
775 errno = ENOMEM;
776 return -1;
777 }
778
779 if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
780 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
781 } else {
782 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
783 }
784
785 if (ret == -1) {
786 TALLOC_FREE(smb_fname_base);
787 return -1;
788 }
789
790 ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname_base);
791 if (ret == 0) {
792 char *dirname = stream_dir(handle, smb_fname_base,
793 &smb_fname_base->st, false);
794
795 if (dirname != NULL) {
796 struct smb_filename *smb_fname_dir =
797 synthetic_smb_fname(talloc_tos(),
798 dirname,
799 NULL,
800 NULL,
801 smb_fname->flags);
802 if (smb_fname_dir == NULL) {
803 TALLOC_FREE(smb_fname_base);
804 TALLOC_FREE(dirname);
805 errno = ENOMEM;
806 return -1;
807 }
808 SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
809 TALLOC_FREE(smb_fname_dir);
810 }
811 TALLOC_FREE(dirname);
812 }
813
814 TALLOC_FREE(smb_fname_base);
815 return ret;
816 }
817
818 static int streams_depot_rename(vfs_handle_struct *handle,
819 const struct smb_filename *smb_fname_src,
820 const struct smb_filename *smb_fname_dst)
821 {
822 struct smb_filename *smb_fname_src_stream = NULL;
823 struct smb_filename *smb_fname_dst_stream = NULL;
824 bool src_is_stream, dst_is_stream;
825 NTSTATUS status;
826 int ret = -1;
827
828 DEBUG(10, ("streams_depot_rename called for %s => %s\n",
829 smb_fname_str_dbg(smb_fname_src),
830 smb_fname_str_dbg(smb_fname_dst)));
831
832 src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
833 dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
834
835 if (!src_is_stream && !dst_is_stream) {
836 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
837 smb_fname_dst);
838 }
839
840 /* for now don't allow renames from or to the default stream */
841 if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
842 is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
843 errno = ENOSYS;
844 goto done;
845 }
846
847 status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
848 false);
849 if (!NT_STATUS_IS_OK(status)) {
850 errno = map_errno_from_nt_status(status);
851 goto done;
852 }
853
854 status = stream_smb_fname(handle, smb_fname_dst,
855 &smb_fname_dst_stream, false);
856 if (!NT_STATUS_IS_OK(status)) {
857 errno = map_errno_from_nt_status(status);
858 goto done;
859 }
860
861 ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
862 smb_fname_dst_stream);
863
864 done:
865 TALLOC_FREE(smb_fname_src_stream);
866 TALLOC_FREE(smb_fname_dst_stream);
867 return ret;
868 }
869
870 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
871 struct stream_struct **streams,
872 const char *name, off_t size,
873 off_t alloc_size)
874 {
875 struct stream_struct *tmp;
876
877 tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
878 (*num_streams)+1);
879 if (tmp == NULL) {
880 return false;
881 }
882
883 tmp[*num_streams].name = talloc_strdup(tmp, name);
884 if (tmp[*num_streams].name == NULL) {
885 return false;
886 }
887
888 tmp[*num_streams].size = size;
889 tmp[*num_streams].alloc_size = alloc_size;
890
891 *streams = tmp;
892 *num_streams += 1;
893 return true;
894 }
895
896 struct streaminfo_state {
897 TALLOC_CTX *mem_ctx;
898 vfs_handle_struct *handle;
899 unsigned int num_streams;
900 struct stream_struct *streams;
901 NTSTATUS status;
902 };
903
904 static bool collect_one_stream(const char *dirname,
905 const char *dirent,
906 void *private_data)
907 {
908 struct streaminfo_state *state =
909 (struct streaminfo_state *)private_data;
910 struct smb_filename *smb_fname = NULL;
911 char *sname = NULL;
912 bool ret;
913
914 sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
915 if (sname == NULL) {
916 state->status = NT_STATUS_NO_MEMORY;
917 ret = false;
918 goto out;
919 }
920
921 smb_fname = synthetic_smb_fname(talloc_tos(), sname, NULL, NULL, 0);
922 if (smb_fname == NULL) {
923 state->status = NT_STATUS_NO_MEMORY;
924 ret = false;
925 goto out;
926 }
927
928 if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
929 DEBUG(10, ("Could not stat %s: %s\n", sname,
930 strerror(errno)));
931 ret = true;
932 goto out;
933 }
934
935 if (!add_one_stream(state->mem_ctx,
936 &state->num_streams, &state->streams,
937 dirent, smb_fname->st.st_ex_size,
938 SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
939 &smb_fname->st))) {
940 state->status = NT_STATUS_NO_MEMORY;
941 ret = false;
942 goto out;
943 }
944
945 ret = true;
946 out:
947 TALLOC_FREE(sname);
948 TALLOC_FREE(smb_fname);
949 return ret;
950 }
951
952 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
953 struct files_struct *fsp,
954 const struct smb_filename *smb_fname,
955 TALLOC_CTX *mem_ctx,
956 unsigned int *pnum_streams,
957 struct stream_struct **pstreams)
958 {
959 struct smb_filename *smb_fname_base = NULL;
960 int ret;
961 NTSTATUS status;
962 struct streaminfo_state state;
963
964 smb_fname_base = synthetic_smb_fname(talloc_tos(),
965 smb_fname->base_name,
966 NULL,
967 NULL,
968 smb_fname->flags);
969 if (smb_fname_base == NULL) {
970 return NT_STATUS_NO_MEMORY;
971 }
972
973 if ((fsp != NULL) && (fsp->fh->fd != -1)) {
974 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
975 }
976 else {
977 if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
978 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
979 } else {
980 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
981 }
982 }
983
984 if (ret == -1) {
985 status = map_nt_error_from_unix(errno);
986 goto out;
987 }
988
989 state.streams = *pstreams;
990 state.num_streams = *pnum_streams;
991 state.mem_ctx = mem_ctx;
992 state.handle = handle;
993 state.status = NT_STATUS_OK;
994
995 if (S_ISLNK(smb_fname_base->st.st_ex_mode)) {
996 /*
997 * Currently we do't have SMB_VFS_LLISTXATTR
998 * inside the VFS which means there's no way
999 * to cope with a symlink when lp_posix_pathnames().
1000 * returns true. For now ignore links.
1001 * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
1002 */
1003 status = NT_STATUS_OK;
1004 } else {
1005 status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
1006 &state);
1007 }
1008
1009 if (!NT_STATUS_IS_OK(status)) {
1010 TALLOC_FREE(state.streams);
1011 goto out;
1012 }
1013
1014 if (!NT_STATUS_IS_OK(state.status)) {
1015 TALLOC_FREE(state.streams);
1016 status = state.status;
1017 goto out;
1018 }
1019
1020 *pnum_streams = state.num_streams;
1021 *pstreams = state.streams;
1022 status = SMB_VFS_NEXT_STREAMINFO(handle,
1023 fsp,
1024 smb_fname_base,
1025 mem_ctx,
1026 pnum_streams,
1027 pstreams);
1028
1029 out:
1030 TALLOC_FREE(smb_fname_base);
1031 return status;
1032 }
1033
1034 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
1035 enum timestamp_set_resolution *p_ts_res)
1036 {
1037 return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
1038 }
1039
1040 static struct vfs_fn_pointers vfs_streams_depot_fns = {
1041 .fs_capabilities_fn = streams_depot_fs_capabilities,
1042 .open_fn = streams_depot_open,
1043 .stat_fn = streams_depot_stat,
1044 .lstat_fn = streams_depot_lstat,
1045 .unlink_fn = streams_depot_unlink,
1046 .rmdir_fn = streams_depot_rmdir,
1047 .rename_fn = streams_depot_rename,
1048 .streaminfo_fn = streams_depot_streaminfo,
1049 };
1050
1051 NTSTATUS vfs_streams_depot_init(void);
1052 NTSTATUS vfs_streams_depot_init(void)
1053 {
1054 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
1055 &vfs_streams_depot_fns);
1056 }
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