2 * Unix SMB/CIFS implementation.
4 * Copyright (C) Volker Lendecke 2014
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.
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.
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/>.
22 #include "lib/util/data_blob.h"
23 #include "librpc/gen_ndr/notify.h"
24 #include "librpc/gen_ndr/messaging.h"
25 #include "librpc/gen_ndr/server_id.h"
26 #include "lib/dbwrap/dbwrap.h"
27 #include "lib/dbwrap/dbwrap_rbt.h"
32 #include "lib/util/server_id_db.h"
33 #include "lib/util/tevent_unix.h"
34 #include "ctdbd_conn.h"
35 #include "ctdb_srvids.h"
36 #include "server_id_db_util.h"
37 #include "lib/util/iov_buf.h"
38 #include "messages_util.h"
40 #ifdef CLUSTER_SUPPORT
41 #include "ctdb_protocol.h"
47 * All of notifyd's state
50 struct notifyd_state {
51 struct tevent_context *ev;
52 struct messaging_context *msg_ctx;
53 struct ctdbd_connection *ctdbd_conn;
56 * Database of everything clients show interest in. Indexed by
57 * absolute path. The database keys are not 0-terminated
58 * because the criticial operation, notifyd_trigger, can walk
59 * the structure from the top without adding intermediate 0s.
60 * The database records contain an array of
62 * struct notifyd_instance
64 * to be maintained and parsed by notifyd_entry_parse()
66 struct db_context *entries;
69 * In the cluster case, this is the place where we store a log
70 * of all MSG_SMB_NOTIFY_REC_CHANGE messages. We just 1:1
71 * forward them to our peer notifyd's in the cluster once a
72 * second or when the log grows too large.
75 struct messaging_reclog *log;
78 * Array of companion notifyd's in a cluster. Every notifyd
79 * broadcasts its messaging_reclog to every other notifyd in
80 * the cluster. This is done by making ctdb send a message to
81 * srvid CTDB_SRVID_SAMBA_NOTIFY_PROXY with destination node
82 * number CTDB_BROADCAST_VNNMAP. Everybody in the cluster who
83 * had called register_with_ctdbd this srvid will receive the
86 * Database replication happens via these broadcasts. Also,
87 * they serve as liveness indication. If a notifyd receives a
88 * broadcast from an unknown peer, it will create one for this
89 * srvid. Also when we don't hear anything from a peer for a
90 * while, we will discard it.
93 struct notifyd_peer **peers;
96 sys_notify_watch_fn sys_notify_watch;
97 struct sys_notify_context *sys_notify_ctx;
101 * notifyd's representation of a notify instance
103 struct notifyd_instance {
104 struct server_id client;
105 struct notify_instance instance;
107 void *sys_watch; /* inotify/fam/etc handle */
110 * Filters after sys_watch took responsibility of some bits
112 uint32_t internal_filter;
113 uint32_t internal_subdir_filter;
116 struct notifyd_peer {
117 struct notifyd_state *state;
118 struct server_id pid;
120 struct db_context *db;
121 time_t last_broadcast;
124 static bool notifyd_rec_change(struct messaging_context *msg_ctx,
125 struct messaging_rec **prec,
127 static bool notifyd_trigger(struct messaging_context *msg_ctx,
128 struct messaging_rec **prec,
130 static bool notifyd_get_db(struct messaging_context *msg_ctx,
131 struct messaging_rec **prec,
134 #ifdef CLUSTER_SUPPORT
135 static bool notifyd_got_db(struct messaging_context *msg_ctx,
136 struct messaging_rec **prec,
138 static void notifyd_broadcast_reclog(struct ctdbd_connection *ctdbd_conn,
139 struct server_id src,
140 struct messaging_reclog *log);
142 static void notifyd_sys_callback(struct sys_notify_context *ctx,
143 void *private_data, struct notify_event *ev,
146 #ifdef CLUSTER_SUPPORT
147 static struct tevent_req *notifyd_broadcast_reclog_send(
148 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
149 struct ctdbd_connection *ctdbd_conn, struct server_id src,
150 struct messaging_reclog *log);
151 static int notifyd_broadcast_reclog_recv(struct tevent_req *req);
153 static struct tevent_req *notifyd_clean_peers_send(
154 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
155 struct notifyd_state *notifyd);
156 static int notifyd_clean_peers_recv(struct tevent_req *req);
159 static int sys_notify_watch_dummy(
161 struct sys_notify_context *ctx,
164 uint32_t *subdir_filter,
165 void (*callback)(struct sys_notify_context *ctx,
167 struct notify_event *ev,
172 void **handle = handle_p;
177 static void notifyd_handler_done(struct tevent_req *subreq);
179 #ifdef CLUSTER_SUPPORT
180 static void notifyd_broadcast_reclog_finished(struct tevent_req *subreq);
181 static void notifyd_clean_peers_finished(struct tevent_req *subreq);
182 static int notifyd_snoop_broadcast(uint32_t src_vnn, uint32_t dst_vnn,
184 const uint8_t *msg, size_t msglen,
188 struct tevent_req *notifyd_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
189 struct messaging_context *msg_ctx,
190 struct ctdbd_connection *ctdbd_conn,
191 sys_notify_watch_fn sys_notify_watch,
192 struct sys_notify_context *sys_notify_ctx)
194 struct tevent_req *req, *subreq;
195 struct notifyd_state *state;
196 struct server_id_db *names_db;
199 req = tevent_req_create(mem_ctx, &state, struct notifyd_state);
204 state->msg_ctx = msg_ctx;
205 state->ctdbd_conn = ctdbd_conn;
207 if (sys_notify_watch == NULL) {
208 sys_notify_watch = sys_notify_watch_dummy;
211 state->sys_notify_watch = sys_notify_watch;
212 state->sys_notify_ctx = sys_notify_ctx;
214 state->entries = db_open_rbt(state);
215 if (tevent_req_nomem(state->entries, req)) {
216 return tevent_req_post(req, ev);
219 subreq = messaging_handler_send(state, ev, msg_ctx,
220 MSG_SMB_NOTIFY_REC_CHANGE,
221 notifyd_rec_change, state);
222 if (tevent_req_nomem(subreq, req)) {
223 return tevent_req_post(req, ev);
225 tevent_req_set_callback(subreq, notifyd_handler_done, req);
227 subreq = messaging_handler_send(state, ev, msg_ctx,
228 MSG_SMB_NOTIFY_TRIGGER,
229 notifyd_trigger, state);
230 if (tevent_req_nomem(subreq, req)) {
231 return tevent_req_post(req, ev);
233 tevent_req_set_callback(subreq, notifyd_handler_done, req);
235 subreq = messaging_handler_send(state, ev, msg_ctx,
236 MSG_SMB_NOTIFY_GET_DB,
237 notifyd_get_db, state);
238 if (tevent_req_nomem(subreq, req)) {
239 return tevent_req_post(req, ev);
241 tevent_req_set_callback(subreq, notifyd_handler_done, req);
243 #ifdef CLUSTER_SUPPORT
244 subreq = messaging_handler_send(state, ev, msg_ctx,
246 notifyd_got_db, state);
247 if (tevent_req_nomem(subreq, req)) {
248 return tevent_req_post(req, ev);
250 tevent_req_set_callback(subreq, notifyd_handler_done, req);
253 names_db = messaging_names_db(msg_ctx);
255 ret = server_id_db_set_exclusive(names_db, "notify-daemon");
257 DEBUG(10, ("%s: server_id_db_add failed: %s\n",
258 __func__, strerror(ret)));
259 tevent_req_error(req, ret);
260 return tevent_req_post(req, ev);
263 if (ctdbd_conn == NULL) {
265 * No cluster around, skip the database replication
271 #ifdef CLUSTER_SUPPORT
272 state->log = talloc_zero(state, struct messaging_reclog);
273 if (tevent_req_nomem(state->log, req)) {
274 return tevent_req_post(req, ev);
277 subreq = notifyd_broadcast_reclog_send(
278 state->log, ev, ctdbd_conn, messaging_server_id(msg_ctx),
280 if (tevent_req_nomem(subreq, req)) {
281 return tevent_req_post(req, ev);
283 tevent_req_set_callback(subreq, notifyd_broadcast_reclog_finished,
286 subreq = notifyd_clean_peers_send(state, ev, state);
287 if (tevent_req_nomem(subreq, req)) {
288 return tevent_req_post(req, ev);
290 tevent_req_set_callback(subreq, notifyd_clean_peers_finished,
293 ret = register_with_ctdbd(ctdbd_conn, CTDB_SRVID_SAMBA_NOTIFY_PROXY,
294 notifyd_snoop_broadcast, state);
296 tevent_req_error(req, ret);
297 return tevent_req_post(req, ev);
304 static void notifyd_handler_done(struct tevent_req *subreq)
306 struct tevent_req *req = tevent_req_callback_data(
307 subreq, struct tevent_req);
310 ret = messaging_handler_recv(subreq);
312 tevent_req_error(req, ret);
315 #ifdef CLUSTER_SUPPORT
317 static void notifyd_broadcast_reclog_finished(struct tevent_req *subreq)
319 struct tevent_req *req = tevent_req_callback_data(
320 subreq, struct tevent_req);
323 ret = notifyd_broadcast_reclog_recv(subreq);
325 tevent_req_error(req, ret);
328 static void notifyd_clean_peers_finished(struct tevent_req *subreq)
330 struct tevent_req *req = tevent_req_callback_data(
331 subreq, struct tevent_req);
334 ret = notifyd_clean_peers_recv(subreq);
336 tevent_req_error(req, ret);
341 int notifyd_recv(struct tevent_req *req)
343 return tevent_req_simple_recv_unix(req);
347 * Parse an entry in the notifyd_context->entries database
350 static bool notifyd_parse_entry(uint8_t *buf, size_t buflen,
351 struct notifyd_instance **instances,
352 size_t *num_instances)
354 if ((buflen % sizeof(struct notifyd_instance)) != 0) {
355 DEBUG(1, ("%s: invalid buffer size: %u\n",
356 __func__, (unsigned)buflen));
360 if (instances != NULL) {
361 *instances = (struct notifyd_instance *)buf;
363 if (num_instances != NULL) {
364 *num_instances = buflen / sizeof(struct notifyd_instance);
369 static bool notifyd_apply_rec_change(
370 const struct server_id *client,
371 const char *path, size_t pathlen,
372 const struct notify_instance *chg,
373 struct db_context *entries,
374 sys_notify_watch_fn sys_notify_watch,
375 struct sys_notify_context *sys_notify_ctx,
376 struct messaging_context *msg_ctx)
378 struct db_record *rec;
379 struct notifyd_instance *instances;
380 size_t num_instances;
382 struct notifyd_instance *instance;
388 DEBUG(1, ("%s: pathlen==0\n", __func__));
391 if (path[pathlen-1] != '\0') {
392 DEBUG(1, ("%s: path not 0-terminated\n", __func__));
396 DEBUG(10, ("%s: path=%s, filter=%u, subdir_filter=%u, "
397 "private_data=%p\n", __func__, path,
398 (unsigned)chg->filter, (unsigned)chg->subdir_filter,
401 rec = dbwrap_fetch_locked(
403 make_tdb_data((const uint8_t *)path, pathlen-1));
406 DEBUG(1, ("%s: dbwrap_fetch_locked failed\n", __func__));
411 value = dbwrap_record_get_value(rec);
413 if (value.dsize != 0) {
414 if (!notifyd_parse_entry(value.dptr, value.dsize, NULL,
421 * Overallocate by one instance to avoid a realloc when adding
423 instances = talloc_array(rec, struct notifyd_instance,
425 if (instances == NULL) {
426 DEBUG(1, ("%s: talloc failed\n", __func__));
430 if (value.dsize != 0) {
431 memcpy(instances, value.dptr, value.dsize);
434 for (i=0; i<num_instances; i++) {
435 instance = &instances[i];
437 if (server_id_equal(&instance->client, client) &&
438 (instance->instance.private_data == chg->private_data)) {
443 if (i < num_instances) {
444 instance->instance = *chg;
447 * We've overallocated for one instance
449 instance = &instances[num_instances];
451 *instance = (struct notifyd_instance) {
454 .internal_filter = chg->filter,
455 .internal_subdir_filter = chg->subdir_filter
461 if ((instance->instance.filter != 0) ||
462 (instance->instance.subdir_filter != 0)) {
465 TALLOC_FREE(instance->sys_watch);
467 ret = sys_notify_watch(entries, sys_notify_ctx, path,
468 &instance->internal_filter,
469 &instance->internal_subdir_filter,
470 notifyd_sys_callback, msg_ctx,
471 &instance->sys_watch);
473 DEBUG(1, ("%s: inotify_watch returned %s\n",
474 __func__, strerror(errno)));
478 if ((instance->instance.filter == 0) &&
479 (instance->instance.subdir_filter == 0)) {
480 /* This is a delete request */
481 TALLOC_FREE(instance->sys_watch);
482 *instance = instances[num_instances-1];
486 DEBUG(10, ("%s: %s has %u instances\n", __func__,
487 path, (unsigned)num_instances));
489 if (num_instances == 0) {
490 status = dbwrap_record_delete(rec);
491 if (!NT_STATUS_IS_OK(status)) {
492 DEBUG(1, ("%s: dbwrap_record_delete returned %s\n",
493 __func__, nt_errstr(status)));
497 value = make_tdb_data(
498 (uint8_t *)instances,
499 sizeof(struct notifyd_instance) * num_instances);
501 status = dbwrap_record_store(rec, value, 0);
502 if (!NT_STATUS_IS_OK(status)) {
503 DEBUG(1, ("%s: dbwrap_record_store returned %s\n",
504 __func__, nt_errstr(status)));
515 static void notifyd_sys_callback(struct sys_notify_context *ctx,
516 void *private_data, struct notify_event *ev,
519 struct messaging_context *msg_ctx = talloc_get_type_abort(
520 private_data, struct messaging_context);
521 struct notify_trigger_msg msg;
525 msg = (struct notify_trigger_msg) {
526 .when = timespec_current(),
527 .action = ev->action,
531 iov[0].iov_base = &msg;
532 iov[0].iov_len = offsetof(struct notify_trigger_msg, path);
533 iov[1].iov_base = discard_const_p(char, ev->dir);
534 iov[1].iov_len = strlen(ev->dir);
535 iov[2].iov_base = &slash;
537 iov[3].iov_base = discard_const_p(char, ev->path);
538 iov[3].iov_len = strlen(ev->path)+1;
541 msg_ctx, messaging_server_id(msg_ctx),
542 MSG_SMB_NOTIFY_TRIGGER, iov, ARRAY_SIZE(iov), NULL, 0);
545 static bool notifyd_parse_rec_change(uint8_t *buf, size_t bufsize,
546 struct notify_rec_change_msg **pmsg,
549 struct notify_rec_change_msg *msg;
551 if (bufsize < offsetof(struct notify_rec_change_msg, path) + 1) {
552 DEBUG(1, ("%s: message too short, ignoring: %u\n", __func__,
557 *pmsg = msg = (struct notify_rec_change_msg *)buf;
558 *pathlen = bufsize - offsetof(struct notify_rec_change_msg, path);
560 DEBUG(10, ("%s: Got rec_change_msg filter=%u, subdir_filter=%u, "
561 "private_data=%p, path=%.*s\n",
562 __func__, (unsigned)msg->instance.filter,
563 (unsigned)msg->instance.subdir_filter,
564 msg->instance.private_data, (int)(*pathlen), msg->path));
569 static bool notifyd_rec_change(struct messaging_context *msg_ctx,
570 struct messaging_rec **prec,
573 struct notifyd_state *state = talloc_get_type_abort(
574 private_data, struct notifyd_state);
575 struct server_id_buf idbuf;
576 struct messaging_rec *rec = *prec;
577 struct notify_rec_change_msg *msg;
581 DEBUG(10, ("%s: Got %d bytes from %s\n", __func__,
582 (unsigned)rec->buf.length,
583 server_id_str_buf(rec->src, &idbuf)));
585 ok = notifyd_parse_rec_change(rec->buf.data, rec->buf.length,
591 ok = notifyd_apply_rec_change(
592 &rec->src, msg->path, pathlen, &msg->instance,
593 state->entries, state->sys_notify_watch, state->sys_notify_ctx,
596 DEBUG(1, ("%s: notifyd_apply_rec_change failed, ignoring\n",
601 if ((state->log == NULL) || (state->ctdbd_conn == NULL)) {
605 #ifdef CLUSTER_SUPPORT
608 struct messaging_rec **tmp;
609 struct messaging_reclog *log;
613 tmp = talloc_realloc(log, log->recs, struct messaging_rec *,
616 DEBUG(1, ("%s: talloc_realloc failed, ignoring\n", __func__));
621 log->recs[log->num_recs] = talloc_move(log->recs, prec);
624 if (log->num_recs >= 100) {
626 * Don't let the log grow too large
628 notifyd_broadcast_reclog(state->ctdbd_conn,
629 messaging_server_id(msg_ctx), log);
638 struct notifyd_trigger_state {
639 struct messaging_context *msg_ctx;
640 struct notify_trigger_msg *msg;
642 bool covered_by_sys_notify;
645 static void notifyd_trigger_parser(TDB_DATA key, TDB_DATA data,
648 static bool notifyd_trigger(struct messaging_context *msg_ctx,
649 struct messaging_rec **prec,
652 struct notifyd_state *state = talloc_get_type_abort(
653 private_data, struct notifyd_state);
654 struct server_id my_id = messaging_server_id(msg_ctx);
655 struct messaging_rec *rec = *prec;
656 struct notifyd_trigger_state tstate;
658 const char *p, *next_p;
660 if (rec->buf.length < offsetof(struct notify_trigger_msg, path) + 1) {
661 DEBUG(1, ("message too short, ignoring: %u\n",
662 (unsigned)rec->buf.length));
665 if (rec->buf.data[rec->buf.length-1] != 0) {
666 DEBUG(1, ("%s: path not 0-terminated, ignoring\n", __func__));
670 tstate.msg_ctx = msg_ctx;
672 tstate.covered_by_sys_notify = (rec->src.vnn == my_id.vnn);
673 tstate.covered_by_sys_notify &= !server_id_equal(&rec->src, &my_id);
675 tstate.msg = (struct notify_trigger_msg *)rec->buf.data;
676 path = tstate.msg->path;
678 DEBUG(10, ("%s: Got trigger_msg action=%u, filter=%u, path=%s\n",
679 __func__, (unsigned)tstate.msg->action,
680 (unsigned)tstate.msg->filter, path));
682 if (path[0] != '/') {
683 DEBUG(1, ("%s: path %s does not start with /, ignoring\n",
688 for (p = strchr(path+1, '/'); p != NULL; p = next_p) {
689 ptrdiff_t path_len = p - path;
693 next_p = strchr(p+1, '/');
694 tstate.recursive = (next_p != NULL);
696 DEBUG(10, ("%s: Trying path %.*s\n", __func__,
697 (int)path_len, path));
699 key = (TDB_DATA) { .dptr = discard_const_p(uint8_t, path),
702 dbwrap_parse_record(state->entries, key,
703 notifyd_trigger_parser, &tstate);
705 if (state->peers == NULL) {
709 if (rec->src.vnn != my_id.vnn) {
713 for (i=0; i<state->num_peers; i++) {
714 if (state->peers[i]->db == NULL) {
716 * Inactive peer, did not get a db yet
720 dbwrap_parse_record(state->peers[i]->db, key,
721 notifyd_trigger_parser, &tstate);
728 static void notifyd_send_delete(struct messaging_context *msg_ctx,
730 struct notifyd_instance *instance);
732 static void notifyd_trigger_parser(TDB_DATA key, TDB_DATA data,
736 struct notifyd_trigger_state *tstate = private_data;
737 struct notify_event_msg msg = { .action = tstate->msg->action };
739 size_t path_len = key.dsize;
740 struct notifyd_instance *instances = NULL;
741 size_t num_instances = 0;
744 if (!notifyd_parse_entry(data.dptr, data.dsize, &instances,
746 DEBUG(1, ("%s: Could not parse notifyd_entry\n", __func__));
750 DEBUG(10, ("%s: Found %u instances for %.*s\n", __func__,
751 (unsigned)num_instances, (int)key.dsize,
754 iov[0].iov_base = &msg;
755 iov[0].iov_len = offsetof(struct notify_event_msg, path);
756 iov[1].iov_base = tstate->msg->path + path_len + 1;
757 iov[1].iov_len = strlen((char *)(iov[1].iov_base)) + 1;
759 for (i=0; i<num_instances; i++) {
760 struct notifyd_instance *instance = &instances[i];
761 struct server_id_buf idbuf;
765 if (tstate->covered_by_sys_notify) {
766 if (tstate->recursive) {
767 i_filter = instance->internal_subdir_filter;
769 i_filter = instance->internal_filter;
772 if (tstate->recursive) {
773 i_filter = instance->instance.subdir_filter;
775 i_filter = instance->instance.filter;
779 if ((i_filter & tstate->msg->filter) == 0) {
783 msg.private_data = instance->instance.private_data;
785 status = messaging_send_iov(
786 tstate->msg_ctx, instance->client,
787 MSG_PVFS_NOTIFY, iov, ARRAY_SIZE(iov), NULL, 0);
789 DEBUG(10, ("%s: messaging_send_iov to %s returned %s\n",
791 server_id_str_buf(instance->client, &idbuf),
794 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
795 procid_is_local(&instance->client)) {
797 * That process has died
799 notifyd_send_delete(tstate->msg_ctx, key, instance);
803 if (!NT_STATUS_IS_OK(status)) {
804 DEBUG(1, ("%s: messaging_send_iov returned %s\n",
805 __func__, nt_errstr(status)));
811 * Send a delete request to ourselves to properly discard a notify
812 * record for an smbd that has died.
815 static void notifyd_send_delete(struct messaging_context *msg_ctx,
817 struct notifyd_instance *instance)
819 struct notify_rec_change_msg msg = {
820 .instance.private_data = instance->instance.private_data
827 * Send a rec_change to ourselves to delete a dead entry
830 iov[0] = (struct iovec) {
832 .iov_len = offsetof(struct notify_rec_change_msg, path) };
833 iov[1] = (struct iovec) { .iov_base = key.dptr, .iov_len = key.dsize };
834 iov[2] = (struct iovec) { .iov_base = &nul, .iov_len = sizeof(nul) };
836 ret = messaging_send_iov_from(
837 msg_ctx, instance->client, messaging_server_id(msg_ctx),
838 MSG_SMB_NOTIFY_REC_CHANGE, iov, ARRAY_SIZE(iov), NULL, 0);
841 DEBUG(10, ("%s: messaging_send_iov_from returned %s\n",
842 __func__, strerror(ret)));
846 static bool notifyd_get_db(struct messaging_context *msg_ctx,
847 struct messaging_rec **prec,
850 struct notifyd_state *state = talloc_get_type_abort(
851 private_data, struct notifyd_state);
852 struct messaging_rec *rec = *prec;
853 struct server_id_buf id1, id2;
855 uint64_t rec_index = UINT64_MAX;
856 uint8_t index_buf[sizeof(uint64_t)];
861 dbsize = dbwrap_marshall(state->entries, NULL, 0);
863 buf = talloc_array(rec, uint8_t, dbsize);
865 DEBUG(1, ("%s: talloc_array(%ju) failed\n",
866 __func__, (uintmax_t)dbsize));
870 dbsize = dbwrap_marshall(state->entries, buf, dbsize);
872 if (dbsize != talloc_get_size(buf)) {
873 DEBUG(1, ("%s: dbsize changed: %ju->%ju\n", __func__,
874 (uintmax_t)talloc_get_size(buf),
880 if (state->log != NULL) {
881 rec_index = state->log->rec_index;
883 SBVAL(index_buf, 0, rec_index);
885 iov[0] = (struct iovec) { .iov_base = index_buf,
886 .iov_len = sizeof(index_buf) };
887 iov[1] = (struct iovec) { .iov_base = buf,
890 DEBUG(10, ("%s: Sending %ju bytes to %s->%s\n", __func__,
891 (uintmax_t)iov_buflen(iov, ARRAY_SIZE(iov)),
892 server_id_str_buf(messaging_server_id(msg_ctx), &id1),
893 server_id_str_buf(rec->src, &id2)));
895 status = messaging_send_iov(msg_ctx, rec->src, MSG_SMB_NOTIFY_DB,
896 iov, ARRAY_SIZE(iov), NULL, 0);
898 if (!NT_STATUS_IS_OK(status)) {
899 DEBUG(1, ("%s: messaging_send_iov failed: %s\n",
900 __func__, nt_errstr(status)));
906 #ifdef CLUSTER_SUPPORT
908 static int notifyd_add_proxy_syswatches(struct db_record *rec,
911 static bool notifyd_got_db(struct messaging_context *msg_ctx,
912 struct messaging_rec **prec,
915 struct notifyd_state *state = talloc_get_type_abort(
916 private_data, struct notifyd_state);
917 struct messaging_rec *rec = *prec;
918 struct notifyd_peer *p = NULL;
919 struct server_id_buf idbuf;
924 for (i=0; i<state->num_peers; i++) {
925 if (server_id_equal(&rec->src, &state->peers[i]->pid)) {
932 DEBUG(10, ("%s: Did not find peer for db from %s\n",
933 __func__, server_id_str_buf(rec->src, &idbuf)));
937 if (rec->buf.length < 8) {
938 DEBUG(10, ("%s: Got short db length %u from %s\n", __func__,
939 (unsigned)rec->buf.length,
940 server_id_str_buf(rec->src, &idbuf)));
945 p->rec_index = BVAL(rec->buf.data, 0);
947 p->db = db_open_rbt(p);
949 DEBUG(10, ("%s: db_open_rbt failed\n", __func__));
954 status = dbwrap_unmarshall(p->db, rec->buf.data + 8,
955 rec->buf.length - 8);
956 if (!NT_STATUS_IS_OK(status)) {
957 DEBUG(10, ("%s: dbwrap_unmarshall returned %s for db %s\n",
958 __func__, nt_errstr(status),
959 server_id_str_buf(rec->src, &idbuf)));
964 dbwrap_traverse_read(p->db, notifyd_add_proxy_syswatches, state,
967 DEBUG(10, ("%s: Database from %s contained %d records\n", __func__,
968 server_id_str_buf(rec->src, &idbuf), count));
973 static void notifyd_broadcast_reclog(struct ctdbd_connection *ctdbd_conn,
974 struct server_id src,
975 struct messaging_reclog *log)
977 enum ndr_err_code ndr_err;
978 uint8_t msghdr[MESSAGE_HDR_LENGTH];
987 DEBUG(10, ("%s: rec_index=%ju, num_recs=%u\n", __func__,
988 (uintmax_t)log->rec_index, (unsigned)log->num_recs));
990 message_hdr_put(msghdr, MSG_SMB_NOTIFY_REC_CHANGES, src,
991 (struct server_id) {0 });
992 iov[0] = (struct iovec) { .iov_base = msghdr,
993 .iov_len = sizeof(msghdr) };
995 ndr_err = ndr_push_struct_blob(
997 (ndr_push_flags_fn_t)ndr_push_messaging_reclog);
998 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
999 DEBUG(1, ("%s: ndr_push_messaging_recs failed: %s\n",
1000 __func__, ndr_errstr(ndr_err)));
1003 iov[1] = (struct iovec) { .iov_base = blob.data,
1004 .iov_len = blob.length };
1006 ret = ctdbd_messaging_send_iov(
1007 ctdbd_conn, CTDB_BROADCAST_VNNMAP,
1008 CTDB_SRVID_SAMBA_NOTIFY_PROXY, iov, ARRAY_SIZE(iov));
1009 TALLOC_FREE(blob.data);
1011 DEBUG(1, ("%s: ctdbd_messaging_send failed: %s\n",
1012 __func__, strerror(ret)));
1016 log->rec_index += 1;
1020 TALLOC_FREE(log->recs);
1023 struct notifyd_broadcast_reclog_state {
1024 struct tevent_context *ev;
1025 struct ctdbd_connection *ctdbd_conn;
1026 struct server_id src;
1027 struct messaging_reclog *log;
1030 static void notifyd_broadcast_reclog_next(struct tevent_req *subreq);
1032 static struct tevent_req *notifyd_broadcast_reclog_send(
1033 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
1034 struct ctdbd_connection *ctdbd_conn, struct server_id src,
1035 struct messaging_reclog *log)
1037 struct tevent_req *req, *subreq;
1038 struct notifyd_broadcast_reclog_state *state;
1040 req = tevent_req_create(mem_ctx, &state,
1041 struct notifyd_broadcast_reclog_state);
1046 state->ctdbd_conn = ctdbd_conn;
1050 subreq = tevent_wakeup_send(state, state->ev,
1051 timeval_current_ofs_msec(1000));
1052 if (tevent_req_nomem(subreq, req)) {
1053 return tevent_req_post(req, ev);
1055 tevent_req_set_callback(subreq, notifyd_broadcast_reclog_next, req);
1059 static void notifyd_broadcast_reclog_next(struct tevent_req *subreq)
1061 struct tevent_req *req = tevent_req_callback_data(
1062 subreq, struct tevent_req);
1063 struct notifyd_broadcast_reclog_state *state = tevent_req_data(
1064 req, struct notifyd_broadcast_reclog_state);
1067 ok = tevent_wakeup_recv(subreq);
1068 TALLOC_FREE(subreq);
1070 tevent_req_oom(req);
1074 notifyd_broadcast_reclog(state->ctdbd_conn, state->src, state->log);
1076 subreq = tevent_wakeup_send(state, state->ev,
1077 timeval_current_ofs_msec(1000));
1078 if (tevent_req_nomem(subreq, req)) {
1081 tevent_req_set_callback(subreq, notifyd_broadcast_reclog_next, req);
1084 static int notifyd_broadcast_reclog_recv(struct tevent_req *req)
1086 return tevent_req_simple_recv_unix(req);
1089 struct notifyd_clean_peers_state {
1090 struct tevent_context *ev;
1091 struct notifyd_state *notifyd;
1094 static void notifyd_clean_peers_next(struct tevent_req *subreq);
1096 static struct tevent_req *notifyd_clean_peers_send(
1097 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
1098 struct notifyd_state *notifyd)
1100 struct tevent_req *req, *subreq;
1101 struct notifyd_clean_peers_state *state;
1103 req = tevent_req_create(mem_ctx, &state,
1104 struct notifyd_clean_peers_state);
1109 state->notifyd = notifyd;
1111 subreq = tevent_wakeup_send(state, state->ev,
1112 timeval_current_ofs_msec(30000));
1113 if (tevent_req_nomem(subreq, req)) {
1114 return tevent_req_post(req, ev);
1116 tevent_req_set_callback(subreq, notifyd_clean_peers_next, req);
1120 static void notifyd_clean_peers_next(struct tevent_req *subreq)
1122 struct tevent_req *req = tevent_req_callback_data(
1123 subreq, struct tevent_req);
1124 struct notifyd_clean_peers_state *state = tevent_req_data(
1125 req, struct notifyd_clean_peers_state);
1126 struct notifyd_state *notifyd = state->notifyd;
1129 time_t now = time(NULL);
1131 ok = tevent_wakeup_recv(subreq);
1132 TALLOC_FREE(subreq);
1134 tevent_req_oom(req);
1139 while (i < notifyd->num_peers) {
1140 struct notifyd_peer *p = notifyd->peers[i];
1142 if ((now - p->last_broadcast) > 60) {
1143 struct server_id_buf idbuf;
1146 * Haven't heard for more than 60 seconds. Call this
1150 DEBUG(10, ("%s: peer %s died\n", __func__,
1151 server_id_str_buf(p->pid, &idbuf)));
1153 * This implicitly decrements notifyd->num_peers
1161 subreq = tevent_wakeup_send(state, state->ev,
1162 timeval_current_ofs_msec(30000));
1163 if (tevent_req_nomem(subreq, req)) {
1166 tevent_req_set_callback(subreq, notifyd_clean_peers_next, req);
1169 static int notifyd_clean_peers_recv(struct tevent_req *req)
1171 return tevent_req_simple_recv_unix(req);
1174 static int notifyd_add_proxy_syswatches(struct db_record *rec,
1177 struct notifyd_state *state = talloc_get_type_abort(
1178 private_data, struct notifyd_state);
1179 struct db_context *db = dbwrap_record_get_db(rec);
1180 TDB_DATA key = dbwrap_record_get_key(rec);
1181 TDB_DATA value = dbwrap_record_get_value(rec);
1182 struct notifyd_instance *instances = NULL;
1183 size_t num_instances = 0;
1185 char path[key.dsize+1];
1188 memcpy(path, key.dptr, key.dsize);
1189 path[key.dsize] = '\0';
1191 ok = notifyd_parse_entry(value.dptr, value.dsize, &instances,
1194 DEBUG(1, ("%s: Could not parse notifyd entry for %s\n",
1199 for (i=0; i<num_instances; i++) {
1200 struct notifyd_instance *instance = &instances[i];
1201 uint32_t filter = instance->instance.filter;
1202 uint32_t subdir_filter = instance->instance.subdir_filter;
1205 ret = state->sys_notify_watch(
1206 db, state->sys_notify_ctx, path,
1207 &filter, &subdir_filter,
1208 notifyd_sys_callback, state->msg_ctx,
1209 &instance->sys_watch);
1211 DEBUG(1, ("%s: inotify_watch returned %s\n",
1212 __func__, strerror(errno)));
1219 static int notifyd_db_del_syswatches(struct db_record *rec, void *private_data)
1221 TDB_DATA key = dbwrap_record_get_key(rec);
1222 TDB_DATA value = dbwrap_record_get_value(rec);
1223 struct notifyd_instance *instances = NULL;
1224 size_t num_instances = 0;
1228 ok = notifyd_parse_entry(value.dptr, value.dsize, &instances,
1231 DEBUG(1, ("%s: Could not parse notifyd entry for %.*s\n",
1232 __func__, (int)key.dsize, (char *)key.dptr));
1235 for (i=0; i<num_instances; i++) {
1236 TALLOC_FREE(instances[i].sys_watch);
1241 static int notifyd_peer_destructor(struct notifyd_peer *p)
1243 struct notifyd_state *state = p->state;
1246 if (p->db != NULL) {
1247 dbwrap_traverse_read(p->db, notifyd_db_del_syswatches,
1251 for (i = 0; i<state->num_peers; i++) {
1252 if (p == state->peers[i]) {
1253 state->peers[i] = state->peers[state->num_peers-1];
1254 state->num_peers -= 1;
1261 static struct notifyd_peer *notifyd_peer_new(
1262 struct notifyd_state *state, struct server_id pid)
1264 struct notifyd_peer *p, **tmp;
1266 tmp = talloc_realloc(state, state->peers, struct notifyd_peer *,
1267 state->num_peers+1);
1273 p = talloc_zero(state->peers, struct notifyd_peer);
1280 state->peers[state->num_peers] = p;
1281 state->num_peers += 1;
1283 talloc_set_destructor(p, notifyd_peer_destructor);
1288 static void notifyd_apply_reclog(struct notifyd_peer *peer,
1289 const uint8_t *msg, size_t msglen)
1291 struct notifyd_state *state = peer->state;
1292 DATA_BLOB blob = { .data = discard_const_p(uint8_t, msg),
1294 struct server_id_buf idbuf;
1295 struct messaging_reclog *log;
1296 enum ndr_err_code ndr_err;
1299 if (peer->db == NULL) {
1306 log = talloc(peer, struct messaging_reclog);
1308 DEBUG(10, ("%s: talloc failed\n", __func__));
1312 ndr_err = ndr_pull_struct_blob_all(
1314 (ndr_pull_flags_fn_t)ndr_pull_messaging_reclog);
1315 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1316 DEBUG(10, ("%s: ndr_pull_messaging_reclog failed: %s\n",
1317 __func__, ndr_errstr(ndr_err)));
1321 DEBUG(10, ("%s: Got %u recs index %ju from %s\n", __func__,
1322 (unsigned)log->num_recs, (uintmax_t)log->rec_index,
1323 server_id_str_buf(peer->pid, &idbuf)));
1325 if (log->rec_index != peer->rec_index) {
1326 DEBUG(3, ("%s: Got rec index %ju from %s, expected %ju\n",
1327 __func__, (uintmax_t)log->rec_index,
1328 server_id_str_buf(peer->pid, &idbuf),
1329 (uintmax_t)peer->rec_index));
1333 for (i=0; i<log->num_recs; i++) {
1334 struct messaging_rec *r = log->recs[i];
1335 struct notify_rec_change_msg *chg;
1339 ok = notifyd_parse_rec_change(r->buf.data, r->buf.length,
1342 DEBUG(3, ("%s: notifyd_parse_rec_change failed\n",
1347 ok = notifyd_apply_rec_change(&r->src, chg->path, pathlen,
1348 &chg->instance, peer->db,
1349 state->sys_notify_watch,
1350 state->sys_notify_ctx,
1353 DEBUG(3, ("%s: notifyd_apply_rec_change failed\n",
1359 peer->rec_index += 1;
1360 peer->last_broadcast = time(NULL);
1366 DEBUG(10, ("%s: Dropping peer %s\n", __func__,
1367 server_id_str_buf(peer->pid, &idbuf)));
1372 * Receive messaging_reclog (log of MSG_SMB_NOTIFY_REC_CHANGE
1373 * messages) broadcasts by other notifyds. Several cases:
1375 * We don't know the source. This creates a new peer. Creating a peer
1376 * involves asking the peer for its full database. We assume ordered
1377 * messages, so the new database will arrive before the next broadcast
1380 * We know the source and the log index matches. We will apply the log
1381 * locally to our peer's db as if we had received it from a local
1384 * We know the source but the log index does not match. This means we
1385 * lost a message. We just drop the whole peer and wait for the next
1386 * broadcast, which will then trigger a fresh database pull.
1389 static int notifyd_snoop_broadcast(uint32_t src_vnn, uint32_t dst_vnn,
1391 const uint8_t *msg, size_t msglen,
1394 struct notifyd_state *state = talloc_get_type_abort(
1395 private_data, struct notifyd_state);
1396 struct server_id my_id = messaging_server_id(state->msg_ctx);
1397 struct notifyd_peer *p;
1400 struct server_id src, dst;
1401 struct server_id_buf idbuf;
1404 if (msglen < MESSAGE_HDR_LENGTH) {
1405 DEBUG(10, ("%s: Got short broadcast\n", __func__));
1408 message_hdr_get(&msg_type, &src, &dst, msg);
1410 if (msg_type != MSG_SMB_NOTIFY_REC_CHANGES) {
1411 DEBUG(10, ("%s Got message %u, ignoring\n", __func__,
1412 (unsigned)msg_type));
1415 if (server_id_equal(&src, &my_id)) {
1416 DEBUG(10, ("%s: Ignoring my own broadcast\n", __func__));
1420 DEBUG(10, ("%s: Got MSG_SMB_NOTIFY_REC_CHANGES from %s\n",
1421 __func__, server_id_str_buf(src, &idbuf)));
1423 for (i=0; i<state->num_peers; i++) {
1424 if (server_id_equal(&state->peers[i]->pid, &src)) {
1426 DEBUG(10, ("%s: Applying changes to peer %u\n",
1427 __func__, (unsigned)i));
1429 notifyd_apply_reclog(state->peers[i],
1430 msg + MESSAGE_HDR_LENGTH,
1431 msglen - MESSAGE_HDR_LENGTH);
1436 DEBUG(10, ("%s: Creating new peer for %s\n", __func__,
1437 server_id_str_buf(src, &idbuf)));
1439 p = notifyd_peer_new(state, src);
1441 DEBUG(10, ("%s: notifyd_peer_new failed\n", __func__));
1445 status = messaging_send_buf(state->msg_ctx, src, MSG_SMB_NOTIFY_GET_DB,
1447 if (!NT_STATUS_IS_OK(status)) {
1448 DEBUG(10, ("%s: messaging_send_buf failed: %s\n",
1449 __func__, nt_errstr(status)));
1458 struct notifyd_parse_db_state {
1459 bool (*fn)(const char *path,
1460 struct server_id server,
1461 const struct notify_instance *instance,
1462 void *private_data);
1466 static bool notifyd_parse_db_parser(TDB_DATA key, TDB_DATA value,
1469 struct notifyd_parse_db_state *state = private_data;
1470 char path[key.dsize+1];
1471 struct notifyd_instance *instances = NULL;
1472 size_t num_instances = 0;
1476 memcpy(path, key.dptr, key.dsize);
1477 path[key.dsize] = 0;
1479 ok = notifyd_parse_entry(value.dptr, value.dsize, &instances,
1482 DEBUG(10, ("%s: Could not parse entry for path %s\n",
1487 for (i=0; i<num_instances; i++) {
1488 ok = state->fn(path, instances[i].client,
1489 &instances[i].instance,
1490 state->private_data);
1499 int notifyd_parse_db(const uint8_t *buf, size_t buflen,
1500 uint64_t *log_index,
1501 bool (*fn)(const char *path,
1502 struct server_id server,
1503 const struct notify_instance *instance,
1504 void *private_data),
1507 struct notifyd_parse_db_state state = {
1508 .fn = fn, .private_data = private_data
1515 *log_index = BVAL(buf, 0);
1520 status = dbwrap_parse_marshall_buf(
1521 buf, buflen, notifyd_parse_db_parser, &state);
1522 if (!NT_STATUS_IS_OK(status)) {
1523 return map_errno_from_nt_status(status);