1 /*
2 Unix SMB/CIFS implementation.
3 change notify handling
4 Copyright (C) Andrew Tridgell 2000
5 Copyright (C) Jeremy Allison 1994-1998
6 Copyright (C) Volker Lendecke 2007
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
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
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../librpc/gen_ndr/ndr_notify.h"
26 #include "librpc/gen_ndr/ndr_file_id.h"
27
28 struct notify_change_event {
29 struct timespec when;
30 uint32_t action;
31 const char *name;
32 };
33
34 struct notify_change_buf {
35 /*
36 * Filters for reinitializing after notifyd has been restarted
37 */
38 uint32_t filter;
39 uint32_t subdir_filter;
40
41 /*
42 * If no requests are pending, changes are queued here. Simple array,
43 * we only append.
44 */
45
46 uint32_t max_buffer_size;
47
48 /*
49 * num_changes == -1 means that we have got a catch-all change, when
50 * asked we just return NT_STATUS_OK without specific changes.
51 */
52 int num_changes;
53 struct notify_change_event *changes;
54
55 /*
56 * If no changes are around requests are queued here. Using a linked
57 * list, because we have to append at the end and delete from the top.
58 */
59 struct notify_change_request *requests;
60 };
61
62 struct notify_change_request {
63 struct notify_change_request *prev, *next;
64 struct files_struct *fsp; /* backpointer for cancel by mid */
65 struct smb_request *req;
66 uint32_t filter;
67 uint32_t max_param;
68 void (*reply_fn)(struct smb_request *req,
69 NTSTATUS error_code,
70 uint8_t *buf, size_t len);
71 struct notify_mid_map *mid_map;
72 void *backend_data;
73 };
74
75 static void notify_fsp(files_struct *fsp, struct timespec when,
76 uint32_t action, const char *name);
77
change_notify_fsp_has_changes(struct files_struct * fsp)78 bool change_notify_fsp_has_changes(struct files_struct *fsp)
79 {
80 if (fsp == NULL) {
81 return false;
82 }
83
84 if (fsp->notify == NULL) {
85 return false;
86 }
87
88 if (fsp->notify->num_changes == 0) {
89 return false;
90 }
91
92 return true;
93 }
94
95 /*
96 * For NTCancel, we need to find the notify_change_request indexed by
97 * mid. Separate list here.
98 */
99
100 struct notify_mid_map {
101 struct notify_mid_map *prev, *next;
102 struct notify_change_request *req;
103 uint64_t mid;
104 };
105
notify_change_record_identical(struct notify_change_event * c1,struct notify_change_event * c2)106 static bool notify_change_record_identical(struct notify_change_event *c1,
107 struct notify_change_event *c2)
108 {
109 /* Note this is deliberately case sensitive. */
110 if (c1->action == c2->action &&
111 strcmp(c1->name, c2->name) == 0) {
112 return True;
113 }
114 return False;
115 }
116
compare_notify_change_events(const void * p1,const void * p2)117 static int compare_notify_change_events(const void *p1, const void *p2)
118 {
119 const struct notify_change_event *e1 = p1;
120 const struct notify_change_event *e2 = p2;
121
122 return timespec_compare(&e1->when, &e2->when);
123 }
124
notify_marshall_changes(int num_changes,uint32_t max_offset,struct notify_change_event * changes,DATA_BLOB * final_blob)125 static bool notify_marshall_changes(int num_changes,
126 uint32_t max_offset,
127 struct notify_change_event *changes,
128 DATA_BLOB *final_blob)
129 {
130 int i;
131
132 if (num_changes == -1) {
133 return false;
134 }
135
136 /*
137 * Sort the notifies by timestamp when the event happened to avoid
138 * coalescing and thus dropping events.
139 */
140
141 qsort(changes, num_changes,
142 sizeof(*changes), compare_notify_change_events);
143
144 for (i=0; i<num_changes; i++) {
145 enum ndr_err_code ndr_err;
146 struct notify_change_event *c;
147 struct FILE_NOTIFY_INFORMATION m;
148 DATA_BLOB blob;
149 uint16_t pad = 0;
150
151 /* Coalesce any identical records. */
152 while (i+1 < num_changes &&
153 notify_change_record_identical(&changes[i],
154 &changes[i+1])) {
155 i++;
156 }
157
158 c = &changes[i];
159
160 m.FileName1 = c->name;
161 m.FileNameLength = strlen_m(c->name)*2;
162 m.Action = c->action;
163
164 m._pad = data_blob_null;
165
166 /*
167 * Offset to next entry, only if there is one
168 */
169
170 if (i == (num_changes-1)) {
171 m.NextEntryOffset = 0;
172 } else {
173 if ((m.FileNameLength % 4) == 2) {
174 m._pad = data_blob_const(&pad, 2);
175 }
176 m.NextEntryOffset =
177 ndr_size_FILE_NOTIFY_INFORMATION(&m, 0);
178 }
179
180 ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &m,
181 (ndr_push_flags_fn_t)ndr_push_FILE_NOTIFY_INFORMATION);
182 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
183 return false;
184 }
185
186 if (DEBUGLEVEL >= 10) {
187 NDR_PRINT_DEBUG(FILE_NOTIFY_INFORMATION, &m);
188 }
189
190 if (!data_blob_append(talloc_tos(), final_blob,
191 blob.data, blob.length)) {
192 data_blob_free(&blob);
193 return false;
194 }
195
196 data_blob_free(&blob);
197
198 if (final_blob->length > max_offset) {
199 /* Too much data for client. */
200 DEBUG(10, ("Client only wanted %d bytes, trying to "
201 "marshall %d bytes\n", (int)max_offset,
202 (int)final_blob->length));
203 return False;
204 }
205 }
206
207 return True;
208 }
209
210 /****************************************************************************
211 Setup the common parts of the return packet and send it.
212 *****************************************************************************/
213
change_notify_reply(struct smb_request * req,NTSTATUS error_code,uint32_t max_param,struct notify_change_buf * notify_buf,void (* reply_fn)(struct smb_request * req,NTSTATUS error_code,uint8_t * buf,size_t len))214 void change_notify_reply(struct smb_request *req,
215 NTSTATUS error_code,
216 uint32_t max_param,
217 struct notify_change_buf *notify_buf,
218 void (*reply_fn)(struct smb_request *req,
219 NTSTATUS error_code,
220 uint8_t *buf, size_t len))
221 {
222 DATA_BLOB blob = data_blob_null;
223
224 if (!NT_STATUS_IS_OK(error_code)) {
225 reply_fn(req, error_code, NULL, 0);
226 return;
227 }
228
229 if (notify_buf == NULL) {
230 reply_fn(req, NT_STATUS_OK, NULL, 0);
231 return;
232 }
233
234 max_param = MIN(max_param, notify_buf->max_buffer_size);
235
236 if (!notify_marshall_changes(notify_buf->num_changes, max_param,
237 notify_buf->changes, &blob)) {
238 /*
239 * We exceed what the client is willing to accept. Send
240 * nothing.
241 */
242 data_blob_free(&blob);
243 }
244
245 reply_fn(req, NT_STATUS_OK, blob.data, blob.length);
246
247 data_blob_free(&blob);
248
249 TALLOC_FREE(notify_buf->changes);
250 notify_buf->num_changes = 0;
251 }
252
253 struct notify_fsp_state {
254 struct files_struct *notified_fsp;
255 struct timespec when;
256 const struct notify_event *e;
257 };
258
notify_fsp_cb(struct files_struct * fsp,void * private_data)259 static struct files_struct *notify_fsp_cb(struct files_struct *fsp,
260 void *private_data)
261 {
262 struct notify_fsp_state *state = private_data;
263
264 if (fsp == state->notified_fsp) {
265 DBG_DEBUG("notify_callback called for %s\n", fsp_str_dbg(fsp));
266 notify_fsp(fsp, state->when, state->e->action, state->e->path);
267 return fsp;
268 }
269
270 return NULL;
271 }
272
notify_callback(struct smbd_server_connection * sconn,void * private_data,struct timespec when,const struct notify_event * e)273 void notify_callback(struct smbd_server_connection *sconn,
274 void *private_data, struct timespec when,
275 const struct notify_event *e)
276 {
277 struct notify_fsp_state state = {
278 .notified_fsp = private_data, .when = when, .e = e
279 };
280 files_forall(sconn, notify_fsp_cb, &state);
281 }
282
change_notify_create(struct files_struct * fsp,uint32_t max_buffer_size,uint32_t filter,bool recursive)283 NTSTATUS change_notify_create(struct files_struct *fsp,
284 uint32_t max_buffer_size,
285 uint32_t filter,
286 bool recursive)
287 {
288 size_t len = fsp_fullbasepath(fsp, NULL, 0);
289 char fullpath[len+1];
290 NTSTATUS status = NT_STATUS_NOT_IMPLEMENTED;
291
292 /*
293 * Setting a changenotify needs READ/LIST access
294 * on the directory handle.
295 */
296 if (!(fsp->access_mask & SEC_DIR_LIST)) {
297 return NT_STATUS_ACCESS_DENIED;
298 }
299
300 if (fsp->notify != NULL) {
301 DEBUG(1, ("change_notify_create: fsp->notify != NULL, "
302 "fname = %s\n", fsp->fsp_name->base_name));
303 return NT_STATUS_INVALID_PARAMETER;
304 }
305
306 if (!(fsp->notify = talloc_zero(NULL, struct notify_change_buf))) {
307 DEBUG(0, ("talloc failed\n"));
308 return NT_STATUS_NO_MEMORY;
309 }
310 fsp->notify->filter = filter;
311 fsp->notify->subdir_filter = recursive ? filter : 0;
312 fsp->notify->max_buffer_size = max_buffer_size;
313
314 fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
315
316 /*
317 * Avoid /. at the end of the path name. notify can't deal with it.
318 */
319 if (len > 1 && fullpath[len-1] == '.' && fullpath[len-2] == '/') {
320 fullpath[len-2] = '\0';
321 }
322
323 if ((fsp->notify->filter != 0) ||
324 (fsp->notify->subdir_filter != 0)) {
325 status = notify_add(fsp->conn->sconn->notify_ctx,
326 fullpath, fsp->notify->filter,
327 fsp->notify->subdir_filter, fsp);
328 }
329
330 return status;
331 }
332
change_notify_add_request(struct smb_request * req,uint32_t max_param,uint32_t filter,bool recursive,struct files_struct * fsp,void (* reply_fn)(struct smb_request * req,NTSTATUS error_code,uint8_t * buf,size_t len))333 NTSTATUS change_notify_add_request(struct smb_request *req,
334 uint32_t max_param,
335 uint32_t filter, bool recursive,
336 struct files_struct *fsp,
337 void (*reply_fn)(struct smb_request *req,
338 NTSTATUS error_code,
339 uint8_t *buf, size_t len))
340 {
341 struct notify_change_request *request = NULL;
342 struct notify_mid_map *map = NULL;
343 struct smbd_server_connection *sconn = req->sconn;
344
345 DEBUG(10, ("change_notify_add_request: Adding request for %s: "
346 "max_param = %d\n", fsp_str_dbg(fsp), (int)max_param));
347
348 if (!(request = talloc(NULL, struct notify_change_request))
349 || !(map = talloc(request, struct notify_mid_map))) {
350 TALLOC_FREE(request);
351 return NT_STATUS_NO_MEMORY;
352 }
353
354 request->mid_map = map;
355 map->req = request;
356
357 request->req = talloc_move(request, &req);
358 request->max_param = max_param;
359 request->filter = filter;
360 request->fsp = fsp;
361 request->reply_fn = reply_fn;
362 request->backend_data = NULL;
363
364 DLIST_ADD_END(fsp->notify->requests, request);
365
366 map->mid = request->req->mid;
367 DLIST_ADD(sconn->smb1.notify_mid_maps, map);
368
369 return NT_STATUS_OK;
370 }
371
change_notify_remove_request(struct smbd_server_connection * sconn,struct notify_change_request * remove_req)372 static void change_notify_remove_request(struct smbd_server_connection *sconn,
373 struct notify_change_request *remove_req)
374 {
375 files_struct *fsp;
376 struct notify_change_request *req;
377
378 /*
379 * Paranoia checks, the fsp referenced must must have the request in
380 * its list of pending requests
381 */
382
383 fsp = remove_req->fsp;
384 SMB_ASSERT(fsp->notify != NULL);
385
386 for (req = fsp->notify->requests; req; req = req->next) {
387 if (req == remove_req) {
388 break;
389 }
390 }
391
392 if (req == NULL) {
393 smb_panic("notify_req not found in fsp's requests");
394 }
395
396 DLIST_REMOVE(fsp->notify->requests, req);
397 DLIST_REMOVE(sconn->smb1.notify_mid_maps, req->mid_map);
398 TALLOC_FREE(req);
399 }
400
smbd_notify_cancel_by_map(struct notify_mid_map * map)401 static void smbd_notify_cancel_by_map(struct notify_mid_map *map)
402 {
403 struct smb_request *smbreq = map->req->req;
404 struct smbd_server_connection *sconn = smbreq->sconn;
405 struct smbd_smb2_request *smb2req = smbreq->smb2req;
406 NTSTATUS notify_status = NT_STATUS_CANCELLED;
407
408 if (smb2req != NULL) {
409 NTSTATUS sstatus;
410
411 if (smb2req->session == NULL) {
412 sstatus = NT_STATUS_USER_SESSION_DELETED;
413 } else {
414 sstatus = smb2req->session->status;
415 }
416
417 if (NT_STATUS_EQUAL(sstatus, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
418 sstatus = NT_STATUS_OK;
419 }
420
421 if (!NT_STATUS_IS_OK(sstatus)) {
422 notify_status = STATUS_NOTIFY_CLEANUP;
423 } else if (smb2req->tcon == NULL) {
424 notify_status = STATUS_NOTIFY_CLEANUP;
425 } else if (!NT_STATUS_IS_OK(smb2req->tcon->status)) {
426 notify_status = STATUS_NOTIFY_CLEANUP;
427 }
428 }
429
430 change_notify_reply(smbreq, notify_status,
431 0, NULL, map->req->reply_fn);
432 change_notify_remove_request(sconn, map->req);
433 }
434
435 /****************************************************************************
436 Delete entries by mid from the change notify pending queue. Always send reply.
437 *****************************************************************************/
438
remove_pending_change_notify_requests_by_mid(struct smbd_server_connection * sconn,uint64_t mid)439 bool remove_pending_change_notify_requests_by_mid(
440 struct smbd_server_connection *sconn, uint64_t mid)
441 {
442 struct notify_mid_map *map;
443
444 for (map = sconn->smb1.notify_mid_maps; map; map = map->next) {
445 if (map->mid == mid) {
446 break;
447 }
448 }
449
450 if (map == NULL) {
451 return false;
452 }
453
454 smbd_notify_cancel_by_map(map);
455 return true;
456 }
457
smbd_notify_cancel_by_smbreq(const struct smb_request * smbreq)458 void smbd_notify_cancel_by_smbreq(const struct smb_request *smbreq)
459 {
460 struct smbd_server_connection *sconn = smbreq->sconn;
461 struct notify_mid_map *map;
462
463 for (map = sconn->smb1.notify_mid_maps; map; map = map->next) {
464 if (map->req->req == smbreq) {
465 break;
466 }
467 }
468
469 if (map == NULL) {
470 return;
471 }
472
473 smbd_notify_cancel_by_map(map);
474 }
475
smbd_notify_cancel_deleted_fn(struct files_struct * fsp,void * private_data)476 static struct files_struct *smbd_notify_cancel_deleted_fn(
477 struct files_struct *fsp, void *private_data)
478 {
479 struct file_id *fid = talloc_get_type_abort(
480 private_data, struct file_id);
481
482 if (file_id_equal(&fsp->file_id, fid)) {
483 remove_pending_change_notify_requests_by_fid(
484 fsp, NT_STATUS_DELETE_PENDING);
485 }
486 return NULL;
487 }
488
smbd_notify_cancel_deleted(struct messaging_context * msg,void * private_data,uint32_t msg_type,struct server_id server_id,DATA_BLOB * data)489 void smbd_notify_cancel_deleted(struct messaging_context *msg,
490 void *private_data, uint32_t msg_type,
491 struct server_id server_id, DATA_BLOB *data)
492 {
493 struct smbd_server_connection *sconn = talloc_get_type_abort(
494 private_data, struct smbd_server_connection);
495 struct file_id *fid;
496 enum ndr_err_code ndr_err;
497
498 fid = talloc(talloc_tos(), struct file_id);
499 if (fid == NULL) {
500 DEBUG(1, ("talloc failed\n"));
501 return;
502 }
503
504 ndr_err = ndr_pull_struct_blob_all(
505 data, fid, fid, (ndr_pull_flags_fn_t)ndr_pull_file_id);
506 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
507 DEBUG(10, ("%s: ndr_pull_file_id failed: %s\n", __func__,
508 ndr_errstr(ndr_err)));
509 goto done;
510 }
511
512 files_forall(sconn, smbd_notify_cancel_deleted_fn, fid);
513
514 done:
515 TALLOC_FREE(fid);
516 }
517
smbd_notifyd_reregister(struct files_struct * fsp,void * private_data)518 static struct files_struct *smbd_notifyd_reregister(struct files_struct *fsp,
519 void *private_data)
520 {
521 DBG_DEBUG("reregister %s\n", fsp->fsp_name->base_name);
522
523 if ((fsp->conn->sconn->notify_ctx != NULL) &&
524 (fsp->notify != NULL) &&
525 ((fsp->notify->filter != 0) ||
526 (fsp->notify->subdir_filter != 0))) {
527 size_t len = fsp_fullbasepath(fsp, NULL, 0);
528 char fullpath[len+1];
529
530 NTSTATUS status;
531
532 fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
533 if (len > 1 && fullpath[len-1] == '.' &&
534 fullpath[len-2] == '/') {
535 fullpath[len-2] = '\0';
536 }
537
538 status = notify_add(fsp->conn->sconn->notify_ctx,
539 fullpath, fsp->notify->filter,
540 fsp->notify->subdir_filter, fsp);
541 if (!NT_STATUS_IS_OK(status)) {
542 DBG_DEBUG("notify_add failed: %s\n",
543 nt_errstr(status));
544 }
545 }
546 return NULL;
547 }
548
smbd_notifyd_restarted(struct messaging_context * msg,void * private_data,uint32_t msg_type,struct server_id server_id,DATA_BLOB * data)549 void smbd_notifyd_restarted(struct messaging_context *msg,
550 void *private_data, uint32_t msg_type,
551 struct server_id server_id, DATA_BLOB *data)
552 {
553 struct smbd_server_connection *sconn = talloc_get_type_abort(
554 private_data, struct smbd_server_connection);
555
556 TALLOC_FREE(sconn->notify_ctx);
557
558 sconn->notify_ctx = notify_init(sconn, sconn->msg_ctx,
559 sconn, notify_callback);
560 if (sconn->notify_ctx == NULL) {
561 DBG_DEBUG("notify_init failed\n");
562 return;
563 }
564
565 files_forall(sconn, smbd_notifyd_reregister, sconn->notify_ctx);
566 }
567
568 /****************************************************************************
569 Delete entries by fnum from the change notify pending queue.
570 *****************************************************************************/
571
remove_pending_change_notify_requests_by_fid(files_struct * fsp,NTSTATUS status)572 void remove_pending_change_notify_requests_by_fid(files_struct *fsp,
573 NTSTATUS status)
574 {
575 if (fsp->notify == NULL) {
576 return;
577 }
578
579 while (fsp->notify->requests != NULL) {
580 change_notify_reply(fsp->notify->requests->req,
581 status, 0, NULL,
582 fsp->notify->requests->reply_fn);
583 change_notify_remove_request(fsp->conn->sconn,
584 fsp->notify->requests);
585 }
586 }
587
notify_fname(connection_struct * conn,uint32_t action,uint32_t filter,const char * path)588 void notify_fname(connection_struct *conn, uint32_t action, uint32_t filter,
589 const char *path)
590 {
591 struct notify_context *notify_ctx = conn->sconn->notify_ctx;
592
593 if (path[0] == '.' && path[1] == '/') {
594 path += 2;
595 }
596
597 notify_trigger(notify_ctx, action, filter, conn->connectpath, path);
598 }
599
notify_fsp(files_struct * fsp,struct timespec when,uint32_t action,const char * name)600 static void notify_fsp(files_struct *fsp, struct timespec when,
601 uint32_t action, const char *name)
602 {
603 struct notify_change_event *change, *changes;
604 char *tmp;
605
606 if (fsp->notify == NULL) {
607 /*
608 * Nobody is waiting, don't queue
609 */
610 return;
611 }
612
613 /*
614 * Someone has triggered a notify previously, queue the change for
615 * later.
616 */
617
618 if ((fsp->notify->num_changes > 1000) || (name == NULL)) {
619 /*
620 * The real number depends on the client buf, just provide a
621 * guard against a DoS here. If name == NULL the CN backend is
622 * alerting us to a problem. Possibly dropped events. Clear
623 * queued changes and send the catch-all response to the client
624 * if a request is pending.
625 */
626 TALLOC_FREE(fsp->notify->changes);
627 fsp->notify->num_changes = -1;
628 if (fsp->notify->requests != NULL) {
629 change_notify_reply(fsp->notify->requests->req,
630 NT_STATUS_OK,
631 fsp->notify->requests->max_param,
632 fsp->notify,
633 fsp->notify->requests->reply_fn);
634 change_notify_remove_request(fsp->conn->sconn,
635 fsp->notify->requests);
636 }
637 return;
638 }
639
640 /* If we've exceeded the server side queue or received a NULL name
641 * from the underlying CN implementation, don't queue up any more
642 * requests until we can send a catch-all response to the client */
643 if (fsp->notify->num_changes == -1) {
644 return;
645 }
646
647 if (!(changes = talloc_realloc(
648 fsp->notify, fsp->notify->changes,
649 struct notify_change_event,
650 fsp->notify->num_changes+1))) {
651 DEBUG(0, ("talloc_realloc failed\n"));
652 return;
653 }
654
655 fsp->notify->changes = changes;
656
657 change = &(fsp->notify->changes[fsp->notify->num_changes]);
658
659 if (!(tmp = talloc_strdup(changes, name))) {
660 DEBUG(0, ("talloc_strdup failed\n"));
661 return;
662 }
663
664 string_replace(tmp, '/', '\\');
665 change->name = tmp;
666
667 change->when = when;
668 change->action = action;
669 fsp->notify->num_changes += 1;
670
671 if (fsp->notify->requests == NULL) {
672 /*
673 * Nobody is waiting, so don't send anything. The ot
674 */
675 return;
676 }
677
678 if (action == NOTIFY_ACTION_OLD_NAME) {
679 /*
680 * We have to send the two rename events in one reply. So hold
681 * the first part back.
682 */
683 return;
684 }
685
686 /*
687 * Someone is waiting for the change, trigger the reply immediately.
688 *
689 * TODO: do we have to walk the lists of requests pending?
690 */
691
692 change_notify_reply(fsp->notify->requests->req,
693 NT_STATUS_OK,
694 fsp->notify->requests->max_param,
695 fsp->notify,
696 fsp->notify->requests->reply_fn);
697
698 change_notify_remove_request(fsp->conn->sconn, fsp->notify->requests);
699 }
700
notify_filter_string(TALLOC_CTX * mem_ctx,uint32_t filter)701 char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32_t filter)
702 {
703 char *result = NULL;
704
705 result = talloc_strdup(mem_ctx, "");
706
707 if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
708 result = talloc_asprintf_append(result, "FILE_NAME|");
709 if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
710 result = talloc_asprintf_append(result, "DIR_NAME|");
711 if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
712 result = talloc_asprintf_append(result, "ATTRIBUTES|");
713 if (filter & FILE_NOTIFY_CHANGE_SIZE)
714 result = talloc_asprintf_append(result, "SIZE|");
715 if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
716 result = talloc_asprintf_append(result, "LAST_WRITE|");
717 if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
718 result = talloc_asprintf_append(result, "LAST_ACCESS|");
719 if (filter & FILE_NOTIFY_CHANGE_CREATION)
720 result = talloc_asprintf_append(result, "CREATION|");
721 if (filter & FILE_NOTIFY_CHANGE_EA)
722 result = talloc_asprintf_append(result, "EA|");
723 if (filter & FILE_NOTIFY_CHANGE_SECURITY)
724 result = talloc_asprintf_append(result, "SECURITY|");
725 if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME)
726 result = talloc_asprintf_append(result, "STREAM_NAME|");
727 if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE)
728 result = talloc_asprintf_append(result, "STREAM_SIZE|");
729 if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE)
730 result = talloc_asprintf_append(result, "STREAM_WRITE|");
731
732 if (result == NULL) return NULL;
733 if (*result == '\0') return result;
734
735 result[strlen(result)-1] = '\0';
736 return result;
737 }
738
sys_notify_context_create(TALLOC_CTX * mem_ctx,struct tevent_context * ev)739 struct sys_notify_context *sys_notify_context_create(TALLOC_CTX *mem_ctx,
740 struct tevent_context *ev)
741 {
742 struct sys_notify_context *ctx;
743
744 if (!(ctx = talloc(mem_ctx, struct sys_notify_context))) {
745 DEBUG(0, ("talloc failed\n"));
746 return NULL;
747 }
748
749 ctx->ev = ev;
750 ctx->private_data = NULL;
751 return ctx;
752 }
753