2 Unix SMB/CIFS implementation.
3 Samba internal messaging functions
4 Copyright (C) Andrew Tridgell 2000
5 Copyright (C) 2001 by Martin Pool
6 Copyright (C) 2002 by Jeremy Allison
7 Copyright (C) 2007 by Volker Lendecke
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 @defgroup messages Internal messaging framework
28 @brief Module for internal messaging between Samba daemons.
30 The idea is that if a part of Samba wants to do communication with
31 another Samba process then it will do a message_register() of a
32 dispatch function, and use message_send_pid() to send messages to
35 The dispatch function is given the pid of the sender, and it can
36 use that to reply by message_send_pid(). See ping_message() for a
39 @caution Dispatch functions must be able to cope with incoming
40 messages on an *odd* byte boundary.
42 This system doesn't have any inherent size limitations but is not
43 very efficient for large messages or when messages are sent in very
49 #include "lib/util/server_id.h"
50 #include "dbwrap/dbwrap.h"
53 #include "lib/util/tevent_unix.h"
54 #include "lib/background.h"
55 #include "lib/messages_dgm.h"
56 #include "lib/util/iov_buf.h"
57 #include "lib/util/server_id_db.h"
58 #include "lib/messages_dgm_ref.h"
59 #include "lib/messages_ctdb.h"
60 #include "lib/messages_ctdb_ref.h"
61 #include "lib/messages_util.h"
62 #include "cluster_support.h"
63 #include "ctdbd_conn.h"
64 #include "ctdb_srvids.h"
66 #ifdef CLUSTER_SUPPORT
67 #include "ctdb_protocol.h"
70 struct messaging_callback {
71 struct messaging_callback *prev, *next;
73 void (*fn)(struct messaging_context *msg, void *private_data,
75 struct server_id server_id, DATA_BLOB *data);
79 struct messaging_registered_ev {
80 struct tevent_context *ev;
81 struct tevent_immediate *im;
85 struct messaging_context {
87 struct tevent_context *event_ctx;
88 struct messaging_callback *callbacks;
90 struct messaging_rec *posted_msgs;
92 struct messaging_registered_ev *event_contexts;
94 struct tevent_req **new_waiters;
95 size_t num_new_waiters;
97 struct tevent_req **waiters;
103 struct server_id_db *names_db;
106 static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
107 struct messaging_rec *rec);
108 static bool messaging_dispatch_classic(struct messaging_context *msg_ctx,
109 struct messaging_rec *rec);
110 static bool messaging_dispatch_waiters(struct messaging_context *msg_ctx,
111 struct tevent_context *ev,
112 struct messaging_rec *rec);
113 static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
114 struct tevent_context *ev,
115 struct messaging_rec *rec);
117 /****************************************************************************
118 A useful function for testing the message system.
119 ****************************************************************************/
121 static void ping_message(struct messaging_context *msg_ctx,
124 struct server_id src,
127 struct server_id_buf idbuf;
129 DEBUG(1, ("INFO: Received PING message from PID %s [%.*s]\n",
130 server_id_str_buf(src, &idbuf), (int)data->length,
131 data->data ? (char *)data->data : ""));
133 messaging_send(msg_ctx, src, MSG_PONG, data);
136 struct messaging_rec *messaging_rec_create(
137 TALLOC_CTX *mem_ctx, struct server_id src, struct server_id dst,
138 uint32_t msg_type, const struct iovec *iov, int iovlen,
139 const int *fds, size_t num_fds)
143 struct messaging_rec *result;
145 if (num_fds > INT8_MAX) {
149 buflen = iov_buflen(iov, iovlen);
153 buf = talloc_array(mem_ctx, uint8_t, buflen);
157 iov_buf(iov, iovlen, buf, buflen);
160 struct messaging_rec rec;
161 int64_t fds64[num_fds];
164 for (i=0; i<num_fds; i++) {
168 rec = (struct messaging_rec) {
169 .msg_version = MESSAGE_VERSION, .msg_type = msg_type,
170 .src = src, .dest = dst,
171 .buf.data = buf, .buf.length = buflen,
172 .num_fds = num_fds, .fds = fds64,
175 result = messaging_rec_dup(mem_ctx, &rec);
183 static bool messaging_register_event_context(struct messaging_context *ctx,
184 struct tevent_context *ev)
186 size_t i, num_event_contexts;
187 struct messaging_registered_ev *free_reg = NULL;
188 struct messaging_registered_ev *tmp;
190 num_event_contexts = talloc_array_length(ctx->event_contexts);
192 for (i=0; i<num_event_contexts; i++) {
193 struct messaging_registered_ev *reg = &ctx->event_contexts[i];
195 if (reg->refcount == 0) {
196 if (reg->ev != NULL) {
201 * We continue here and may find another
202 * free_req, but the important thing is
203 * that we continue to search for an
204 * existing registration in the loop.
215 if (free_reg == NULL) {
216 struct tevent_immediate *im = NULL;
218 im = tevent_create_immediate(ctx);
223 tmp = talloc_realloc(ctx, ctx->event_contexts,
224 struct messaging_registered_ev,
225 num_event_contexts+1);
229 ctx->event_contexts = tmp;
231 free_reg = &ctx->event_contexts[num_event_contexts];
232 free_reg->im = talloc_move(ctx->event_contexts, &im);
236 * free_reg->im might be cached
239 free_reg->refcount = 1;
244 static bool messaging_deregister_event_context(struct messaging_context *ctx,
245 struct tevent_context *ev)
247 size_t i, num_event_contexts;
249 num_event_contexts = talloc_array_length(ctx->event_contexts);
251 for (i=0; i<num_event_contexts; i++) {
252 struct messaging_registered_ev *reg = &ctx->event_contexts[i];
254 if (reg->refcount == 0) {
261 if (reg->refcount == 0) {
263 * The primary event context
264 * is never unregistered using
265 * messaging_deregister_event_context()
266 * it's only registered using
267 * messaging_register_event_context().
269 SMB_ASSERT(ev != ctx->event_ctx);
270 SMB_ASSERT(reg->ev != ctx->event_ctx);
273 * Not strictly necessary, just
279 * Do not talloc_free(reg->im),
280 * recycle immediates events.
282 * We just invalidate it using
283 * the primary event context,
284 * which is never unregistered.
286 tevent_schedule_immediate(reg->im,
296 static void messaging_post_main_event_context(struct tevent_context *ev,
297 struct tevent_immediate *im,
300 struct messaging_context *ctx = talloc_get_type_abort(
301 private_data, struct messaging_context);
303 while (ctx->posted_msgs != NULL) {
304 struct messaging_rec *rec = ctx->posted_msgs;
307 DLIST_REMOVE(ctx->posted_msgs, rec);
309 consumed = messaging_dispatch_classic(ctx, rec);
311 consumed = messaging_dispatch_waiters(
312 ctx, ctx->event_ctx, rec);
318 for (i=0; i<rec->num_fds; i++) {
327 static void messaging_post_sub_event_context(struct tevent_context *ev,
328 struct tevent_immediate *im,
331 struct messaging_context *ctx = talloc_get_type_abort(
332 private_data, struct messaging_context);
333 struct messaging_rec *rec, *next;
335 for (rec = ctx->posted_msgs; rec != NULL; rec = next) {
340 consumed = messaging_dispatch_waiters(ctx, ev, rec);
342 DLIST_REMOVE(ctx->posted_msgs, rec);
348 static bool messaging_alert_event_contexts(struct messaging_context *ctx)
350 size_t i, num_event_contexts;
352 num_event_contexts = talloc_array_length(ctx->event_contexts);
354 for (i=0; i<num_event_contexts; i++) {
355 struct messaging_registered_ev *reg = &ctx->event_contexts[i];
357 if (reg->refcount == 0) {
362 * We depend on schedule_immediate to work
363 * multiple times. Might be a bit inefficient,
364 * but this needs to be proven in tests. The
365 * alternatively would be to track whether the
366 * immediate has already been scheduled. For
367 * now, avoid that complexity here.
370 if (reg->ev == ctx->event_ctx) {
371 tevent_schedule_immediate(
373 messaging_post_main_event_context,
376 tevent_schedule_immediate(
378 messaging_post_sub_event_context,
386 static void messaging_recv_cb(struct tevent_context *ev,
387 const uint8_t *msg, size_t msg_len,
388 int *fds, size_t num_fds,
391 struct messaging_context *msg_ctx = talloc_get_type_abort(
392 private_data, struct messaging_context);
393 struct server_id_buf idbuf;
394 struct messaging_rec rec;
395 int64_t fds64[MIN(num_fds, INT8_MAX)];
398 if (msg_len < MESSAGE_HDR_LENGTH) {
399 DBG_WARNING("message too short: %zu\n", msg_len);
403 if (num_fds > INT8_MAX) {
404 DBG_WARNING("too many fds: %zu\n", num_fds);
409 * "consume" the fds by copying them and setting
410 * the original variable to -1
412 for (i=0; i < num_fds; i++) {
417 rec = (struct messaging_rec) {
418 .msg_version = MESSAGE_VERSION,
419 .buf.data = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH,
420 .buf.length = msg_len - MESSAGE_HDR_LENGTH,
425 message_hdr_get(&rec.msg_type, &rec.src, &rec.dest, msg);
427 DBG_DEBUG("Received message 0x%x len %zu (num_fds:%zu) from %s\n",
428 (unsigned)rec.msg_type, rec.buf.length, num_fds,
429 server_id_str_buf(rec.src, &idbuf));
431 if (server_id_same_process(&rec.src, &msg_ctx->id)) {
432 DBG_DEBUG("Ignoring self-send\n");
436 messaging_dispatch_rec(msg_ctx, ev, &rec);
440 for (i=0; i < num_fds; i++) {
445 static int messaging_context_destructor(struct messaging_context *ctx)
449 for (i=0; i<ctx->num_new_waiters; i++) {
450 if (ctx->new_waiters[i] != NULL) {
451 tevent_req_set_cleanup_fn(ctx->new_waiters[i], NULL);
452 ctx->new_waiters[i] = NULL;
455 for (i=0; i<ctx->num_waiters; i++) {
456 if (ctx->waiters[i] != NULL) {
457 tevent_req_set_cleanup_fn(ctx->waiters[i], NULL);
458 ctx->waiters[i] = NULL;
463 * The immediates from messaging_alert_event_contexts
464 * reference "ctx". Don't let them outlive the
465 * messaging_context we're destroying here.
467 TALLOC_FREE(ctx->event_contexts);
472 static const char *private_path(const char *name)
474 return talloc_asprintf(talloc_tos(), "%s/%s", lp_private_dir(), name);
477 static NTSTATUS messaging_init_internal(TALLOC_CTX *mem_ctx,
478 struct tevent_context *ev,
479 struct messaging_context **pmsg_ctx)
482 struct messaging_context *ctx;
483 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
485 const char *lck_path;
486 const char *priv_path;
490 * sec_init() *must* be called before any other
491 * functions that use sec_XXX(). e.g. sec_initial_uid().
496 lck_path = lock_path(talloc_tos(), "msg.lock");
497 if (lck_path == NULL) {
498 return NT_STATUS_NO_MEMORY;
501 ok = directory_create_or_exist_strict(lck_path,
505 DBG_DEBUG("Could not create lock directory: %s\n",
507 return NT_STATUS_ACCESS_DENIED;
510 priv_path = private_path("msg.sock");
511 if (priv_path == NULL) {
512 return NT_STATUS_NO_MEMORY;
515 ok = directory_create_or_exist_strict(priv_path, sec_initial_uid(),
518 DBG_DEBUG("Could not create msg directory: %s\n",
520 return NT_STATUS_ACCESS_DENIED;
523 frame = talloc_stackframe();
525 return NT_STATUS_NO_MEMORY;
528 ctx = talloc_zero(frame, struct messaging_context);
530 status = NT_STATUS_NO_MEMORY;
534 ctx->id = (struct server_id) {
535 .pid = getpid(), .vnn = NONCLUSTER_VNN
540 ok = messaging_register_event_context(ctx, ev);
542 status = NT_STATUS_NO_MEMORY;
546 ctx->msg_dgm_ref = messaging_dgm_ref(ctx,
554 if (ctx->msg_dgm_ref == NULL) {
555 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
556 status = map_nt_error_from_unix(ret);
559 talloc_set_destructor(ctx, messaging_context_destructor);
561 #ifdef CLUSTER_SUPPORT
562 if (lp_clustering()) {
563 ctx->msg_ctdb_ref = messaging_ctdb_ref(
565 lp_ctdbd_socket(), lp_ctdb_timeout(),
566 ctx->id.unique_id, messaging_recv_cb, ctx, &ret);
567 if (ctx->msg_ctdb_ref == NULL) {
568 DBG_NOTICE("messaging_ctdb_ref failed: %s\n",
570 status = map_nt_error_from_unix(ret);
576 ctx->id.vnn = get_my_vnn();
578 ctx->names_db = server_id_db_init(ctx,
582 TDB_INCOMPATIBLE_HASH|TDB_CLEAR_IF_FIRST);
583 if (ctx->names_db == NULL) {
584 DBG_DEBUG("server_id_db_init failed\n");
585 status = NT_STATUS_NO_MEMORY;
589 messaging_register(ctx, NULL, MSG_PING, ping_message);
591 /* Register some debugging related messages */
593 register_msg_pool_usage(ctx);
594 register_dmalloc_msgs(ctx);
595 debug_register_msgs(ctx);
598 struct server_id_buf tmp;
599 DBG_DEBUG("my id: %s\n", server_id_str_buf(ctx->id, &tmp));
602 *pmsg_ctx = talloc_steal(mem_ctx, ctx);
604 status = NT_STATUS_OK;
611 struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
612 struct tevent_context *ev)
614 struct messaging_context *ctx = NULL;
617 status = messaging_init_internal(mem_ctx,
620 if (!NT_STATUS_IS_OK(status)) {
627 struct server_id messaging_server_id(const struct messaging_context *msg_ctx)
633 * re-init after a fork
635 NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
640 TALLOC_FREE(msg_ctx->msg_dgm_ref);
641 TALLOC_FREE(msg_ctx->msg_ctdb_ref);
643 msg_ctx->id = (struct server_id) {
644 .pid = getpid(), .vnn = msg_ctx->id.vnn
647 lck_path = lock_path(talloc_tos(), "msg.lock");
648 if (lck_path == NULL) {
649 return NT_STATUS_NO_MEMORY;
652 msg_ctx->msg_dgm_ref = messaging_dgm_ref(
653 msg_ctx, msg_ctx->event_ctx, &msg_ctx->id.unique_id,
654 private_path("msg.sock"), lck_path,
655 messaging_recv_cb, msg_ctx, &ret);
657 if (msg_ctx->msg_dgm_ref == NULL) {
658 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
659 return map_nt_error_from_unix(ret);
662 if (lp_clustering()) {
663 msg_ctx->msg_ctdb_ref = messaging_ctdb_ref(
664 msg_ctx, msg_ctx->event_ctx,
665 lp_ctdbd_socket(), lp_ctdb_timeout(),
666 msg_ctx->id.unique_id, messaging_recv_cb, msg_ctx,
668 if (msg_ctx->msg_ctdb_ref == NULL) {
669 DBG_NOTICE("messaging_ctdb_ref failed: %s\n",
671 return map_nt_error_from_unix(ret);
675 server_id_db_reinit(msg_ctx->names_db, msg_ctx->id);
682 * Register a dispatch function for a particular message type. Allow multiple
685 NTSTATUS messaging_register(struct messaging_context *msg_ctx,
688 void (*fn)(struct messaging_context *msg,
691 struct server_id server_id,
694 struct messaging_callback *cb;
696 DEBUG(5, ("Registering messaging pointer for type %u - "
698 (unsigned)msg_type, private_data));
701 * Only one callback per type
704 for (cb = msg_ctx->callbacks; cb != NULL; cb = cb->next) {
705 /* we allow a second registration of the same message
706 type if it has a different private pointer. This is
707 needed in, for example, the internal notify code,
708 which creates a new notify context for each tree
709 connect, and expects to receive messages to each of
711 if (cb->msg_type == msg_type && private_data == cb->private_data) {
712 DEBUG(5,("Overriding messaging pointer for type %u - private_data=%p\n",
713 (unsigned)msg_type, private_data));
715 cb->private_data = private_data;
720 if (!(cb = talloc(msg_ctx, struct messaging_callback))) {
721 return NT_STATUS_NO_MEMORY;
724 cb->msg_type = msg_type;
726 cb->private_data = private_data;
728 DLIST_ADD(msg_ctx->callbacks, cb);
733 De-register the function for a particular message type.
735 void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
738 struct messaging_callback *cb, *next;
740 for (cb = ctx->callbacks; cb; cb = next) {
742 if ((cb->msg_type == msg_type)
743 && (cb->private_data == private_data)) {
744 DEBUG(5,("Deregistering messaging pointer for type %u - private_data=%p\n",
745 (unsigned)msg_type, private_data));
746 DLIST_REMOVE(ctx->callbacks, cb);
753 Send a message to a particular server
755 NTSTATUS messaging_send(struct messaging_context *msg_ctx,
756 struct server_id server, uint32_t msg_type,
757 const DATA_BLOB *data)
759 struct iovec iov = {0};
762 iov.iov_base = data->data;
763 iov.iov_len = data->length;
766 return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1, NULL, 0);
769 NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
770 struct server_id server, uint32_t msg_type,
771 const uint8_t *buf, size_t len)
773 DATA_BLOB blob = data_blob_const(buf, len);
774 return messaging_send(msg_ctx, server, msg_type, &blob);
777 static int messaging_post_self(struct messaging_context *msg_ctx,
778 struct server_id src, struct server_id dst,
780 const struct iovec *iov, int iovlen,
781 const int *fds, size_t num_fds)
783 struct messaging_rec *rec;
786 rec = messaging_rec_create(
787 msg_ctx, src, dst, msg_type, iov, iovlen, fds, num_fds);
792 ok = messaging_alert_event_contexts(msg_ctx);
798 DLIST_ADD_END(msg_ctx->posted_msgs, rec);
803 int messaging_send_iov_from(struct messaging_context *msg_ctx,
804 struct server_id src, struct server_id dst,
806 const struct iovec *iov, int iovlen,
807 const int *fds, size_t num_fds)
810 uint8_t hdr[MESSAGE_HDR_LENGTH];
811 struct iovec iov2[iovlen+1];
813 if (server_id_is_disconnected(&dst)) {
817 if (num_fds > INT8_MAX) {
821 if (server_id_equal(&dst, &msg_ctx->id)) {
822 ret = messaging_post_self(msg_ctx, src, dst, msg_type,
823 iov, iovlen, fds, num_fds);
827 message_hdr_put(hdr, msg_type, src, dst);
828 iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
829 memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
831 if (dst.vnn != msg_ctx->id.vnn) {
836 ret = messaging_ctdb_send(dst.vnn, dst.pid, iov2, iovlen+1);
840 ret = messaging_dgm_send(dst.pid, iov2, iovlen+1, fds, num_fds);
844 ret = messaging_dgm_send(dst.pid, iov2, iovlen+1,
849 if (ret == ECONNREFUSED) {
851 * Linux returns this when a socket exists in the file
852 * system without a listening process. This is not
853 * documented in susv4 or the linux manpages, but it's
854 * easily testable. For the higher levels this is the
855 * same as "destination does not exist"
863 NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
864 struct server_id dst, uint32_t msg_type,
865 const struct iovec *iov, int iovlen,
866 const int *fds, size_t num_fds)
870 ret = messaging_send_iov_from(msg_ctx, msg_ctx->id, dst, msg_type,
871 iov, iovlen, fds, num_fds);
873 return map_nt_error_from_unix(ret);
878 struct send_all_state {
879 struct messaging_context *msg_ctx;
885 static int send_all_fn(pid_t pid, void *private_data)
887 struct send_all_state *state = private_data;
890 if (pid == getpid()) {
891 DBG_DEBUG("Skip ourselves in messaging_send_all\n");
895 status = messaging_send_buf(state->msg_ctx, pid_to_procid(pid),
896 state->msg_type, state->buf, state->len);
897 if (!NT_STATUS_IS_OK(status)) {
898 DBG_WARNING("messaging_send_buf to %ju failed: %s\n",
899 (uintmax_t)pid, nt_errstr(status));
905 void messaging_send_all(struct messaging_context *msg_ctx,
906 int msg_type, const void *buf, size_t len)
908 struct send_all_state state = {
909 .msg_ctx = msg_ctx, .msg_type = msg_type,
910 .buf = buf, .len = len
914 #ifdef CLUSTER_SUPPORT
915 if (lp_clustering()) {
916 struct ctdbd_connection *conn = messaging_ctdb_connection();
917 uint8_t msghdr[MESSAGE_HDR_LENGTH];
918 struct iovec iov[] = {
919 { .iov_base = msghdr,
920 .iov_len = sizeof(msghdr) },
921 { .iov_base = discard_const_p(void, buf),
925 message_hdr_put(msghdr, msg_type, messaging_server_id(msg_ctx),
926 (struct server_id) {0});
928 ret = ctdbd_messaging_send_iov(
929 conn, CTDB_BROADCAST_CONNECTED,
930 CTDB_SRVID_SAMBA_PROCESS,
931 iov, ARRAY_SIZE(iov));
933 DBG_WARNING("ctdbd_messaging_send_iov failed: %s\n",
941 ret = messaging_dgm_forall(send_all_fn, &state);
943 DBG_WARNING("messaging_dgm_forall failed: %s\n",
948 static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
949 struct messaging_rec *rec)
951 struct messaging_rec *result;
952 size_t fds_size = sizeof(int64_t) * rec->num_fds;
955 payload_len = rec->buf.length + fds_size;
956 if (payload_len < rec->buf.length) {
961 result = talloc_pooled_object(mem_ctx, struct messaging_rec, 2,
963 if (result == NULL) {
968 /* Doesn't fail, see talloc_pooled_object */
970 result->buf.data = talloc_memdup(result, rec->buf.data,
974 if (result->num_fds > 0) {
975 result->fds = talloc_memdup(result, rec->fds, fds_size);
981 struct messaging_filtered_read_state {
982 struct tevent_context *ev;
983 struct messaging_context *msg_ctx;
984 struct messaging_dgm_fde *fde;
985 struct messaging_ctdb_fde *cluster_fde;
987 bool (*filter)(struct messaging_rec *rec, void *private_data);
990 struct messaging_rec *rec;
993 static void messaging_filtered_read_cleanup(struct tevent_req *req,
994 enum tevent_req_state req_state);
996 struct tevent_req *messaging_filtered_read_send(
997 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
998 struct messaging_context *msg_ctx,
999 bool (*filter)(struct messaging_rec *rec, void *private_data),
1002 struct tevent_req *req;
1003 struct messaging_filtered_read_state *state;
1004 size_t new_waiters_len;
1007 req = tevent_req_create(mem_ctx, &state,
1008 struct messaging_filtered_read_state);
1013 state->msg_ctx = msg_ctx;
1014 state->filter = filter;
1015 state->private_data = private_data;
1018 * We have to defer the callback here, as we might be called from
1019 * within a different tevent_context than state->ev
1021 tevent_req_defer_callback(req, state->ev);
1023 state->fde = messaging_dgm_register_tevent_context(state, ev);
1024 if (tevent_req_nomem(state->fde, req)) {
1025 return tevent_req_post(req, ev);
1028 if (lp_clustering()) {
1029 state->cluster_fde =
1030 messaging_ctdb_register_tevent_context(state, ev);
1031 if (tevent_req_nomem(state->cluster_fde, req)) {
1032 return tevent_req_post(req, ev);
1037 * We add ourselves to the "new_waiters" array, not the "waiters"
1038 * array. If we are called from within messaging_read_done,
1039 * messaging_dispatch_rec will be in an active for-loop on
1040 * "waiters". We must be careful not to mess with this array, because
1041 * it could mean that a single event is being delivered twice.
1044 new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
1046 if (new_waiters_len == msg_ctx->num_new_waiters) {
1047 struct tevent_req **tmp;
1049 tmp = talloc_realloc(msg_ctx, msg_ctx->new_waiters,
1050 struct tevent_req *, new_waiters_len+1);
1051 if (tevent_req_nomem(tmp, req)) {
1052 return tevent_req_post(req, ev);
1054 msg_ctx->new_waiters = tmp;
1057 msg_ctx->new_waiters[msg_ctx->num_new_waiters] = req;
1058 msg_ctx->num_new_waiters += 1;
1059 tevent_req_set_cleanup_fn(req, messaging_filtered_read_cleanup);
1061 ok = messaging_register_event_context(msg_ctx, ev);
1063 tevent_req_oom(req);
1064 return tevent_req_post(req, ev);
1070 static void messaging_filtered_read_cleanup(struct tevent_req *req,
1071 enum tevent_req_state req_state)
1073 struct messaging_filtered_read_state *state = tevent_req_data(
1074 req, struct messaging_filtered_read_state);
1075 struct messaging_context *msg_ctx = state->msg_ctx;
1079 tevent_req_set_cleanup_fn(req, NULL);
1081 TALLOC_FREE(state->fde);
1082 TALLOC_FREE(state->cluster_fde);
1084 ok = messaging_deregister_event_context(msg_ctx, state->ev);
1090 * Just set the [new_]waiters entry to NULL, be careful not to mess
1091 * with the other "waiters" array contents. We are often called from
1092 * within "messaging_dispatch_rec", which loops over
1093 * "waiters". Messing with the "waiters" array will mess up that
1097 for (i=0; i<msg_ctx->num_waiters; i++) {
1098 if (msg_ctx->waiters[i] == req) {
1099 msg_ctx->waiters[i] = NULL;
1104 for (i=0; i<msg_ctx->num_new_waiters; i++) {
1105 if (msg_ctx->new_waiters[i] == req) {
1106 msg_ctx->new_waiters[i] = NULL;
1112 static void messaging_filtered_read_done(struct tevent_req *req,
1113 struct messaging_rec *rec)
1115 struct messaging_filtered_read_state *state = tevent_req_data(
1116 req, struct messaging_filtered_read_state);
1118 state->rec = messaging_rec_dup(state, rec);
1119 if (tevent_req_nomem(state->rec, req)) {
1122 tevent_req_done(req);
1125 int messaging_filtered_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1126 struct messaging_rec **presult)
1128 struct messaging_filtered_read_state *state = tevent_req_data(
1129 req, struct messaging_filtered_read_state);
1132 if (tevent_req_is_unix_error(req, &err)) {
1133 tevent_req_received(req);
1136 if (presult != NULL) {
1137 *presult = talloc_move(mem_ctx, &state->rec);
1142 struct messaging_read_state {
1144 struct messaging_rec *rec;
1147 static bool messaging_read_filter(struct messaging_rec *rec,
1148 void *private_data);
1149 static void messaging_read_done(struct tevent_req *subreq);
1151 struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
1152 struct tevent_context *ev,
1153 struct messaging_context *msg,
1156 struct tevent_req *req, *subreq;
1157 struct messaging_read_state *state;
1159 req = tevent_req_create(mem_ctx, &state,
1160 struct messaging_read_state);
1164 state->msg_type = msg_type;
1166 subreq = messaging_filtered_read_send(state, ev, msg,
1167 messaging_read_filter, state);
1168 if (tevent_req_nomem(subreq, req)) {
1169 return tevent_req_post(req, ev);
1171 tevent_req_set_callback(subreq, messaging_read_done, req);
1175 static bool messaging_read_filter(struct messaging_rec *rec,
1178 struct messaging_read_state *state = talloc_get_type_abort(
1179 private_data, struct messaging_read_state);
1181 if (rec->num_fds != 0) {
1185 return rec->msg_type == state->msg_type;
1188 static void messaging_read_done(struct tevent_req *subreq)
1190 struct tevent_req *req = tevent_req_callback_data(
1191 subreq, struct tevent_req);
1192 struct messaging_read_state *state = tevent_req_data(
1193 req, struct messaging_read_state);
1196 ret = messaging_filtered_read_recv(subreq, state, &state->rec);
1197 TALLOC_FREE(subreq);
1198 if (tevent_req_error(req, ret)) {
1201 tevent_req_done(req);
1204 int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1205 struct messaging_rec **presult)
1207 struct messaging_read_state *state = tevent_req_data(
1208 req, struct messaging_read_state);
1211 if (tevent_req_is_unix_error(req, &err)) {
1214 if (presult != NULL) {
1215 *presult = talloc_move(mem_ctx, &state->rec);
1220 static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
1222 if (msg_ctx->num_new_waiters == 0) {
1226 if (talloc_array_length(msg_ctx->waiters) <
1227 (msg_ctx->num_waiters + msg_ctx->num_new_waiters)) {
1228 struct tevent_req **tmp;
1229 tmp = talloc_realloc(
1230 msg_ctx, msg_ctx->waiters, struct tevent_req *,
1231 msg_ctx->num_waiters + msg_ctx->num_new_waiters);
1233 DEBUG(1, ("%s: talloc failed\n", __func__));
1236 msg_ctx->waiters = tmp;
1239 memcpy(&msg_ctx->waiters[msg_ctx->num_waiters], msg_ctx->new_waiters,
1240 sizeof(struct tevent_req *) * msg_ctx->num_new_waiters);
1242 msg_ctx->num_waiters += msg_ctx->num_new_waiters;
1243 msg_ctx->num_new_waiters = 0;
1248 static bool messaging_dispatch_classic(struct messaging_context *msg_ctx,
1249 struct messaging_rec *rec)
1251 struct messaging_callback *cb, *next;
1253 for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
1257 if (cb->msg_type != rec->msg_type) {
1262 * the old style callbacks don't support fd passing
1264 for (j=0; j < rec->num_fds; j++) {
1265 int fd = rec->fds[j];
1271 cb->fn(msg_ctx, cb->private_data, rec->msg_type,
1272 rec->src, &rec->buf);
1280 static bool messaging_dispatch_waiters(struct messaging_context *msg_ctx,
1281 struct tevent_context *ev,
1282 struct messaging_rec *rec)
1286 if (!messaging_append_new_waiters(msg_ctx)) {
1291 while (i < msg_ctx->num_waiters) {
1292 struct tevent_req *req;
1293 struct messaging_filtered_read_state *state;
1295 req = msg_ctx->waiters[i];
1298 * This got cleaned up. In the meantime,
1299 * move everything down one. We need
1300 * to keep the order of waiters, as
1301 * other code may depend on this.
1303 if (i < msg_ctx->num_waiters - 1) {
1304 memmove(&msg_ctx->waiters[i],
1305 &msg_ctx->waiters[i+1],
1306 sizeof(struct tevent_req *) *
1307 (msg_ctx->num_waiters - i - 1));
1309 msg_ctx->num_waiters -= 1;
1313 state = tevent_req_data(
1314 req, struct messaging_filtered_read_state);
1315 if ((ev == state->ev) &&
1316 state->filter(rec, state->private_data)) {
1317 messaging_filtered_read_done(req, rec);
1328 Dispatch one messaging_rec
1330 static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
1331 struct tevent_context *ev,
1332 struct messaging_rec *rec)
1337 if (ev == msg_ctx->event_ctx) {
1338 consumed = messaging_dispatch_classic(msg_ctx, rec);
1344 consumed = messaging_dispatch_waiters(msg_ctx, ev, rec);
1349 if (ev != msg_ctx->event_ctx) {
1351 int fds[rec->num_fds];
1355 * We've been listening on a nested event
1356 * context. Messages need to be handled in the main
1357 * event context, so post to ourselves
1360 iov.iov_base = rec->buf.data;
1361 iov.iov_len = rec->buf.length;
1363 for (i=0; i<rec->num_fds; i++) {
1364 fds[i] = rec->fds[i];
1367 ret = messaging_post_self(
1368 msg_ctx, rec->src, rec->dest, rec->msg_type,
1369 &iov, 1, fds, rec->num_fds);
1376 * If the fd-array isn't used, just close it.
1378 for (i=0; i < rec->num_fds; i++) {
1379 int fd = rec->fds[i];
1386 static int mess_parent_dgm_cleanup(void *private_data);
1387 static void mess_parent_dgm_cleanup_done(struct tevent_req *req);
1389 bool messaging_parent_dgm_cleanup_init(struct messaging_context *msg)
1391 struct tevent_req *req;
1393 req = background_job_send(
1394 msg, msg->event_ctx, msg, NULL, 0,
1395 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1397 mess_parent_dgm_cleanup, msg);
1399 DBG_WARNING("background_job_send failed\n");
1402 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1406 static int mess_parent_dgm_cleanup(void *private_data)
1410 ret = messaging_dgm_wipe();
1411 DEBUG(10, ("messaging_dgm_wipe returned %s\n",
1412 ret ? strerror(ret) : "ok"));
1413 return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1417 static void mess_parent_dgm_cleanup_done(struct tevent_req *req)
1419 struct messaging_context *msg = tevent_req_callback_data(
1420 req, struct messaging_context);
1423 status = background_job_recv(req);
1425 DEBUG(1, ("messaging dgm cleanup job ended with %s\n",
1426 nt_errstr(status)));
1428 req = background_job_send(
1429 msg, msg->event_ctx, msg, NULL, 0,
1430 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1432 mess_parent_dgm_cleanup, msg);
1434 DEBUG(1, ("background_job_send failed\n"));
1437 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1440 int messaging_cleanup(struct messaging_context *msg_ctx, pid_t pid)
1445 ret = messaging_dgm_wipe();
1447 ret = messaging_dgm_cleanup(pid);
1453 struct tevent_context *messaging_tevent_context(
1454 struct messaging_context *msg_ctx)
1456 return msg_ctx->event_ctx;
1459 struct server_id_db *messaging_names_db(struct messaging_context *msg_ctx)
1461 return msg_ctx->names_db;