2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 2000
5 Copyright (C) Jeremy Allison 1994-1998
6 Copyright (C) Volker Lendecke 2007
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.
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.
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/>.
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"
28 struct notify_change_event {
34 struct notify_change_buf {
36 * Filters for reinitializing after notifyd has been restarted
39 uint32_t subdir_filter;
42 * If no requests are pending, changes are queued here. Simple array,
46 uint32_t max_buffer_size;
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.
53 struct notify_change_event *changes;
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.
59 struct notify_change_request *requests;
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;
68 void (*reply_fn)(struct smb_request *req,
70 uint8_t *buf, size_t len);
71 struct notify_mid_map *mid_map;
75 static void notify_fsp(files_struct *fsp, struct timespec when,
76 uint32_t action, const char *name);
78 bool change_notify_fsp_has_changes(struct files_struct *fsp)
84 if (fsp->notify == NULL) {
88 if (fsp->notify->num_changes == 0) {
96 * For NTCancel, we need to find the notify_change_request indexed by
97 * mid. Separate list here.
100 struct notify_mid_map {
101 struct notify_mid_map *prev, *next;
102 struct notify_change_request *req;
106 static bool notify_change_record_identical(struct notify_change_event *c1,
107 struct notify_change_event *c2)
109 /* Note this is deliberately case sensitive. */
110 if (c1->action == c2->action &&
111 strcmp(c1->name, c2->name) == 0) {
117 static int compare_notify_change_events(const void *p1, const void *p2)
119 const struct notify_change_event *e1 = p1;
120 const struct notify_change_event *e2 = p2;
122 return timespec_compare(&e1->when, &e2->when);
125 static bool notify_marshall_changes(int num_changes,
127 struct notify_change_event *changes,
128 DATA_BLOB *final_blob)
132 if (num_changes == -1) {
137 * Sort the notifies by timestamp when the event happened to avoid
138 * coalescing and thus dropping events.
141 qsort(changes, num_changes,
142 sizeof(*changes), compare_notify_change_events);
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;
151 /* Coalesce any identical records. */
152 while (i+1 < num_changes &&
153 notify_change_record_identical(&changes[i],
160 m.FileName1 = c->name;
161 m.FileNameLength = strlen_m(c->name)*2;
162 m.Action = c->action;
164 m._pad = data_blob_null;
167 * Offset to next entry, only if there is one
170 if (i == (num_changes-1)) {
171 m.NextEntryOffset = 0;
173 if ((m.FileNameLength % 4) == 2) {
174 m._pad = data_blob_const(&pad, 2);
177 ndr_size_FILE_NOTIFY_INFORMATION(&m, 0);
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)) {
186 if (DEBUGLEVEL >= 10) {
187 NDR_PRINT_DEBUG(FILE_NOTIFY_INFORMATION, &m);
190 if (!data_blob_append(talloc_tos(), final_blob,
191 blob.data, blob.length)) {
192 data_blob_free(&blob);
196 data_blob_free(&blob);
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));
210 /****************************************************************************
211 Setup the common parts of the return packet and send it.
212 *****************************************************************************/
214 void change_notify_reply(struct smb_request *req,
217 struct notify_change_buf *notify_buf,
218 void (*reply_fn)(struct smb_request *req,
220 uint8_t *buf, size_t len))
222 DATA_BLOB blob = data_blob_null;
224 if (!NT_STATUS_IS_OK(error_code)) {
225 reply_fn(req, error_code, NULL, 0);
229 if (notify_buf == NULL) {
230 reply_fn(req, NT_STATUS_OK, NULL, 0);
234 max_param = MIN(max_param, notify_buf->max_buffer_size);
236 if (!notify_marshall_changes(notify_buf->num_changes, max_param,
237 notify_buf->changes, &blob)) {
239 * We exceed what the client is willing to accept. Send
242 data_blob_free(&blob);
245 reply_fn(req, NT_STATUS_OK, blob.data, blob.length);
247 data_blob_free(&blob);
249 TALLOC_FREE(notify_buf->changes);
250 notify_buf->num_changes = 0;
253 struct notify_fsp_state {
254 struct files_struct *notified_fsp;
255 struct timespec when;
256 const struct notify_event *e;
259 static struct files_struct *notify_fsp_cb(struct files_struct *fsp,
262 struct notify_fsp_state *state = private_data;
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);
273 void notify_callback(struct smbd_server_connection *sconn,
274 void *private_data, struct timespec when,
275 const struct notify_event *e)
277 struct notify_fsp_state state = {
278 .notified_fsp = private_data, .when = when, .e = e
280 files_forall(sconn, notify_fsp_cb, &state);
283 NTSTATUS change_notify_create(struct files_struct *fsp,
284 uint32_t max_buffer_size,
288 size_t len = fsp_fullbasepath(fsp, NULL, 0);
289 char fullpath[len+1];
290 NTSTATUS status = NT_STATUS_NOT_IMPLEMENTED;
292 if (fsp->notify != NULL) {
293 DEBUG(1, ("change_notify_create: fsp->notify != NULL, "
294 "fname = %s\n", fsp->fsp_name->base_name));
295 return NT_STATUS_INVALID_PARAMETER;
298 if (!(fsp->notify = talloc_zero(NULL, struct notify_change_buf))) {
299 DEBUG(0, ("talloc failed\n"));
300 return NT_STATUS_NO_MEMORY;
302 fsp->notify->filter = filter;
303 fsp->notify->subdir_filter = recursive ? filter : 0;
304 fsp->notify->max_buffer_size = max_buffer_size;
306 fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
309 * Avoid /. at the end of the path name. notify can't deal with it.
311 if (len > 1 && fullpath[len-1] == '.' && fullpath[len-2] == '/') {
312 fullpath[len-2] = '\0';
315 if ((fsp->notify->filter != 0) ||
316 (fsp->notify->subdir_filter != 0)) {
317 status = notify_add(fsp->conn->sconn->notify_ctx,
318 fullpath, fsp->notify->filter,
319 fsp->notify->subdir_filter, fsp);
325 NTSTATUS change_notify_add_request(struct smb_request *req,
327 uint32_t filter, bool recursive,
328 struct files_struct *fsp,
329 void (*reply_fn)(struct smb_request *req,
331 uint8_t *buf, size_t len))
333 struct notify_change_request *request = NULL;
334 struct notify_mid_map *map = NULL;
335 struct smbd_server_connection *sconn = req->sconn;
337 DEBUG(10, ("change_notify_add_request: Adding request for %s: "
338 "max_param = %d\n", fsp_str_dbg(fsp), (int)max_param));
340 if (!(request = talloc(NULL, struct notify_change_request))
341 || !(map = talloc(request, struct notify_mid_map))) {
342 TALLOC_FREE(request);
343 return NT_STATUS_NO_MEMORY;
346 request->mid_map = map;
349 request->req = talloc_move(request, &req);
350 request->max_param = max_param;
351 request->filter = filter;
353 request->reply_fn = reply_fn;
354 request->backend_data = NULL;
356 DLIST_ADD_END(fsp->notify->requests, request);
358 map->mid = request->req->mid;
359 DLIST_ADD(sconn->smb1.notify_mid_maps, map);
364 static void change_notify_remove_request(struct smbd_server_connection *sconn,
365 struct notify_change_request *remove_req)
368 struct notify_change_request *req;
371 * Paranoia checks, the fsp referenced must must have the request in
372 * its list of pending requests
375 fsp = remove_req->fsp;
376 SMB_ASSERT(fsp->notify != NULL);
378 for (req = fsp->notify->requests; req; req = req->next) {
379 if (req == remove_req) {
385 smb_panic("notify_req not found in fsp's requests");
388 DLIST_REMOVE(fsp->notify->requests, req);
389 DLIST_REMOVE(sconn->smb1.notify_mid_maps, req->mid_map);
393 static void smbd_notify_cancel_by_map(struct notify_mid_map *map)
395 struct smb_request *smbreq = map->req->req;
396 struct smbd_server_connection *sconn = smbreq->sconn;
397 struct smbd_smb2_request *smb2req = smbreq->smb2req;
398 NTSTATUS notify_status = NT_STATUS_CANCELLED;
400 if (smb2req != NULL) {
403 if (smb2req->session == NULL) {
404 sstatus = NT_STATUS_USER_SESSION_DELETED;
406 sstatus = smb2req->session->status;
409 if (NT_STATUS_EQUAL(sstatus, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
410 sstatus = NT_STATUS_OK;
413 if (!NT_STATUS_IS_OK(sstatus)) {
414 notify_status = NT_STATUS_NOTIFY_CLEANUP;
415 } else if (smb2req->tcon == NULL) {
416 notify_status = NT_STATUS_NOTIFY_CLEANUP;
417 } else if (!NT_STATUS_IS_OK(smb2req->tcon->status)) {
418 notify_status = NT_STATUS_NOTIFY_CLEANUP;
422 change_notify_reply(smbreq, notify_status,
423 0, NULL, map->req->reply_fn);
424 change_notify_remove_request(sconn, map->req);
427 /****************************************************************************
428 Delete entries by mid from the change notify pending queue. Always send reply.
429 *****************************************************************************/
431 bool remove_pending_change_notify_requests_by_mid(
432 struct smbd_server_connection *sconn, uint64_t mid)
434 struct notify_mid_map *map;
436 for (map = sconn->smb1.notify_mid_maps; map; map = map->next) {
437 if (map->mid == mid) {
446 smbd_notify_cancel_by_map(map);
450 void smbd_notify_cancel_by_smbreq(const struct smb_request *smbreq)
452 struct smbd_server_connection *sconn = smbreq->sconn;
453 struct notify_mid_map *map;
455 for (map = sconn->smb1.notify_mid_maps; map; map = map->next) {
456 if (map->req->req == smbreq) {
465 smbd_notify_cancel_by_map(map);
468 static struct files_struct *smbd_notify_cancel_deleted_fn(
469 struct files_struct *fsp, void *private_data)
471 struct file_id *fid = talloc_get_type_abort(
472 private_data, struct file_id);
474 if (file_id_equal(&fsp->file_id, fid)) {
475 remove_pending_change_notify_requests_by_fid(
476 fsp, NT_STATUS_DELETE_PENDING);
481 void smbd_notify_cancel_deleted(struct messaging_context *msg,
482 void *private_data, uint32_t msg_type,
483 struct server_id server_id, DATA_BLOB *data)
485 struct smbd_server_connection *sconn = talloc_get_type_abort(
486 private_data, struct smbd_server_connection);
488 enum ndr_err_code ndr_err;
490 fid = talloc(talloc_tos(), struct file_id);
492 DEBUG(1, ("talloc failed\n"));
496 ndr_err = ndr_pull_struct_blob_all(
497 data, fid, fid, (ndr_pull_flags_fn_t)ndr_pull_file_id);
498 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
499 DEBUG(10, ("%s: ndr_pull_file_id failed: %s\n", __func__,
500 ndr_errstr(ndr_err)));
504 files_forall(sconn, smbd_notify_cancel_deleted_fn, fid);
510 static struct files_struct *smbd_notifyd_reregister(struct files_struct *fsp,
513 DBG_DEBUG("reregister %s\n", fsp->fsp_name->base_name);
515 if ((fsp->conn->sconn->notify_ctx != NULL) &&
516 (fsp->notify != NULL) &&
517 ((fsp->notify->filter != 0) ||
518 (fsp->notify->subdir_filter != 0))) {
519 size_t len = fsp_fullbasepath(fsp, NULL, 0);
520 char fullpath[len+1];
524 fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
525 if (len > 1 && fullpath[len-1] == '.' &&
526 fullpath[len-2] == '/') {
527 fullpath[len-2] = '\0';
530 status = notify_add(fsp->conn->sconn->notify_ctx,
531 fullpath, fsp->notify->filter,
532 fsp->notify->subdir_filter, fsp);
533 if (!NT_STATUS_IS_OK(status)) {
534 DBG_DEBUG("notify_add failed: %s\n",
541 void smbd_notifyd_restarted(struct messaging_context *msg,
542 void *private_data, uint32_t msg_type,
543 struct server_id server_id, DATA_BLOB *data)
545 struct smbd_server_connection *sconn = talloc_get_type_abort(
546 private_data, struct smbd_server_connection);
548 TALLOC_FREE(sconn->notify_ctx);
550 sconn->notify_ctx = notify_init(sconn, sconn->msg_ctx,
551 sconn, notify_callback);
552 if (sconn->notify_ctx == NULL) {
553 DBG_DEBUG("notify_init failed\n");
557 files_forall(sconn, smbd_notifyd_reregister, sconn->notify_ctx);
560 /****************************************************************************
561 Delete entries by fnum from the change notify pending queue.
562 *****************************************************************************/
564 void remove_pending_change_notify_requests_by_fid(files_struct *fsp,
567 if (fsp->notify == NULL) {
571 while (fsp->notify->requests != NULL) {
572 change_notify_reply(fsp->notify->requests->req,
574 fsp->notify->requests->reply_fn);
575 change_notify_remove_request(fsp->conn->sconn,
576 fsp->notify->requests);
580 void notify_fname(connection_struct *conn, uint32_t action, uint32_t filter,
583 struct notify_context *notify_ctx = conn->sconn->notify_ctx;
585 if (path[0] == '.' && path[1] == '/') {
589 notify_trigger(notify_ctx, action, filter, conn->connectpath, path);
592 static void notify_fsp(files_struct *fsp, struct timespec when,
593 uint32_t action, const char *name)
595 struct notify_change_event *change, *changes;
598 if (fsp->notify == NULL) {
600 * Nobody is waiting, don't queue
606 * Someone has triggered a notify previously, queue the change for
610 if ((fsp->notify->num_changes > 1000) || (name == NULL)) {
612 * The real number depends on the client buf, just provide a
613 * guard against a DoS here. If name == NULL the CN backend is
614 * alerting us to a problem. Possibly dropped events. Clear
615 * queued changes and send the catch-all response to the client
616 * if a request is pending.
618 TALLOC_FREE(fsp->notify->changes);
619 fsp->notify->num_changes = -1;
620 if (fsp->notify->requests != NULL) {
621 change_notify_reply(fsp->notify->requests->req,
623 fsp->notify->requests->max_param,
625 fsp->notify->requests->reply_fn);
626 change_notify_remove_request(fsp->conn->sconn,
627 fsp->notify->requests);
632 /* If we've exceeded the server side queue or received a NULL name
633 * from the underlying CN implementation, don't queue up any more
634 * requests until we can send a catch-all response to the client */
635 if (fsp->notify->num_changes == -1) {
639 if (!(changes = talloc_realloc(
640 fsp->notify, fsp->notify->changes,
641 struct notify_change_event,
642 fsp->notify->num_changes+1))) {
643 DEBUG(0, ("talloc_realloc failed\n"));
647 fsp->notify->changes = changes;
649 change = &(fsp->notify->changes[fsp->notify->num_changes]);
651 if (!(tmp = talloc_strdup(changes, name))) {
652 DEBUG(0, ("talloc_strdup failed\n"));
656 string_replace(tmp, '/', '\\');
660 change->action = action;
661 fsp->notify->num_changes += 1;
663 if (fsp->notify->requests == NULL) {
665 * Nobody is waiting, so don't send anything. The ot
670 if (action == NOTIFY_ACTION_OLD_NAME) {
672 * We have to send the two rename events in one reply. So hold
673 * the first part back.
679 * Someone is waiting for the change, trigger the reply immediately.
681 * TODO: do we have to walk the lists of requests pending?
684 change_notify_reply(fsp->notify->requests->req,
686 fsp->notify->requests->max_param,
688 fsp->notify->requests->reply_fn);
690 change_notify_remove_request(fsp->conn->sconn, fsp->notify->requests);
693 char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32_t filter)
697 result = talloc_strdup(mem_ctx, "");
699 if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
700 result = talloc_asprintf_append(result, "FILE_NAME|");
701 if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
702 result = talloc_asprintf_append(result, "DIR_NAME|");
703 if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
704 result = talloc_asprintf_append(result, "ATTRIBUTES|");
705 if (filter & FILE_NOTIFY_CHANGE_SIZE)
706 result = talloc_asprintf_append(result, "SIZE|");
707 if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
708 result = talloc_asprintf_append(result, "LAST_WRITE|");
709 if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
710 result = talloc_asprintf_append(result, "LAST_ACCESS|");
711 if (filter & FILE_NOTIFY_CHANGE_CREATION)
712 result = talloc_asprintf_append(result, "CREATION|");
713 if (filter & FILE_NOTIFY_CHANGE_EA)
714 result = talloc_asprintf_append(result, "EA|");
715 if (filter & FILE_NOTIFY_CHANGE_SECURITY)
716 result = talloc_asprintf_append(result, "SECURITY|");
717 if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME)
718 result = talloc_asprintf_append(result, "STREAM_NAME|");
719 if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE)
720 result = talloc_asprintf_append(result, "STREAM_SIZE|");
721 if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE)
722 result = talloc_asprintf_append(result, "STREAM_WRITE|");
724 if (result == NULL) return NULL;
725 if (*result == '\0') return result;
727 result[strlen(result)-1] = '\0';
731 struct sys_notify_context *sys_notify_context_create(TALLOC_CTX *mem_ctx,
732 struct tevent_context *ev)
734 struct sys_notify_context *ctx;
736 if (!(ctx = talloc(mem_ctx, struct sys_notify_context))) {
737 DEBUG(0, ("talloc failed\n"));
742 ctx->private_data = NULL;