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_util.h"
61 struct messaging_callback {
62 struct messaging_callback *prev, *next;
64 void (*fn)(struct messaging_context *msg, void *private_data,
66 struct server_id server_id, DATA_BLOB *data);
70 struct messaging_context {
72 struct tevent_context *event_ctx;
73 struct messaging_callback *callbacks;
75 struct tevent_req **new_waiters;
76 unsigned num_new_waiters;
78 struct tevent_req **waiters;
82 struct messaging_backend *remote;
84 struct server_id_db *names_db;
87 static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
88 struct messaging_rec *rec);
89 static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
90 struct tevent_context *ev,
91 struct messaging_rec *rec);
93 /****************************************************************************
94 A useful function for testing the message system.
95 ****************************************************************************/
97 static void ping_message(struct messaging_context *msg_ctx,
100 struct server_id src,
103 struct server_id_buf idbuf;
105 DEBUG(1, ("INFO: Received PING message from PID %s [%.*s]\n",
106 server_id_str_buf(src, &idbuf), (int)data->length,
107 data->data ? (char *)data->data : ""));
109 messaging_send(msg_ctx, src, MSG_PONG, data);
112 static struct messaging_rec *messaging_rec_create(
113 TALLOC_CTX *mem_ctx, struct server_id src, struct server_id dst,
114 uint32_t msg_type, const struct iovec *iov, int iovlen,
115 const int *fds, size_t num_fds)
119 struct messaging_rec *result;
121 if (num_fds > INT8_MAX) {
125 buflen = iov_buflen(iov, iovlen);
129 buf = talloc_array(mem_ctx, uint8_t, buflen);
133 iov_buf(iov, iovlen, buf, buflen);
136 struct messaging_rec rec;
137 int64_t fds64[num_fds];
140 for (i=0; i<num_fds; i++) {
144 rec = (struct messaging_rec) {
145 .msg_version = MESSAGE_VERSION, .msg_type = msg_type,
146 .src = src, .dest = dst,
147 .buf.data = buf, .buf.length = buflen,
148 .num_fds = num_fds, .fds = fds64,
151 result = messaging_rec_dup(mem_ctx, &rec);
159 static void messaging_recv_cb(struct tevent_context *ev,
160 const uint8_t *msg, size_t msg_len,
161 int *fds, size_t num_fds,
164 struct messaging_context *msg_ctx = talloc_get_type_abort(
165 private_data, struct messaging_context);
166 struct server_id_buf idbuf;
167 struct messaging_rec rec;
168 int64_t fds64[MIN(num_fds, INT8_MAX)];
171 if (msg_len < MESSAGE_HDR_LENGTH) {
172 DBG_WARNING("message too short: %zu\n", msg_len);
176 if (num_fds > INT8_MAX) {
177 DBG_WARNING("too many fds: %zu\n", num_fds);
182 * "consume" the fds by copying them and setting
183 * the original variable to -1
185 for (i=0; i < num_fds; i++) {
190 rec = (struct messaging_rec) {
191 .msg_version = MESSAGE_VERSION,
192 .buf.data = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH,
193 .buf.length = msg_len - MESSAGE_HDR_LENGTH,
198 message_hdr_get(&rec.msg_type, &rec.src, &rec.dest, msg);
200 DBG_DEBUG("Received message 0x%x len %zu (num_fds:%zu) from %s\n",
201 (unsigned)rec.msg_type, rec.buf.length, num_fds,
202 server_id_str_buf(rec.src, &idbuf));
204 messaging_dispatch_rec(msg_ctx, ev, &rec);
208 for (i=0; i < num_fds; i++) {
213 static int messaging_context_destructor(struct messaging_context *ctx)
217 for (i=0; i<ctx->num_new_waiters; i++) {
218 if (ctx->new_waiters[i] != NULL) {
219 tevent_req_set_cleanup_fn(ctx->new_waiters[i], NULL);
220 ctx->new_waiters[i] = NULL;
223 for (i=0; i<ctx->num_waiters; i++) {
224 if (ctx->waiters[i] != NULL) {
225 tevent_req_set_cleanup_fn(ctx->waiters[i], NULL);
226 ctx->waiters[i] = NULL;
233 static const char *private_path(const char *name)
235 return talloc_asprintf(talloc_tos(), "%s/%s", lp_private_dir(), name);
238 static NTSTATUS messaging_init_internal(TALLOC_CTX *mem_ctx,
239 struct tevent_context *ev,
240 struct messaging_context **pmsg_ctx)
243 struct messaging_context *ctx;
244 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
246 const char *lck_path;
247 const char *priv_path;
250 lck_path = lock_path("msg.lock");
251 if (lck_path == NULL) {
252 return NT_STATUS_NO_MEMORY;
255 ok = directory_create_or_exist_strict(lck_path,
259 DBG_DEBUG("Could not create lock directory: %s\n",
261 return NT_STATUS_ACCESS_DENIED;
264 priv_path = private_path("msg.sock");
265 if (priv_path == NULL) {
266 return NT_STATUS_NO_MEMORY;
269 ok = directory_create_or_exist_strict(priv_path, sec_initial_uid(),
272 DBG_DEBUG("Could not create msg directory: %s\n",
274 return NT_STATUS_ACCESS_DENIED;
277 frame = talloc_stackframe();
279 return NT_STATUS_NO_MEMORY;
282 ctx = talloc_zero(frame, struct messaging_context);
284 status = NT_STATUS_NO_MEMORY;
288 ctx->id = (struct server_id) {
289 .pid = getpid(), .vnn = NONCLUSTER_VNN
296 ctx->msg_dgm_ref = messaging_dgm_ref(ctx,
304 if (ctx->msg_dgm_ref == NULL) {
305 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
306 status = map_nt_error_from_unix(ret);
309 talloc_set_destructor(ctx, messaging_context_destructor);
311 if (lp_clustering()) {
312 ret = messaging_ctdbd_init(ctx, ctx, &ctx->remote);
315 DEBUG(2, ("messaging_ctdbd_init failed: %s\n",
317 status = map_nt_error_from_unix(ret);
321 ctx->id.vnn = get_my_vnn();
323 ctx->names_db = server_id_db_init(ctx,
327 TDB_INCOMPATIBLE_HASH|TDB_CLEAR_IF_FIRST);
328 if (ctx->names_db == NULL) {
329 DBG_DEBUG("server_id_db_init failed\n");
330 status = NT_STATUS_NO_MEMORY;
334 messaging_register(ctx, NULL, MSG_PING, ping_message);
336 /* Register some debugging related messages */
338 register_msg_pool_usage(ctx);
339 register_dmalloc_msgs(ctx);
340 debug_register_msgs(ctx);
343 struct server_id_buf tmp;
344 DBG_DEBUG("my id: %s\n", server_id_str_buf(ctx->id, &tmp));
347 *pmsg_ctx = talloc_steal(mem_ctx, ctx);
349 status = NT_STATUS_OK;
356 struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
357 struct tevent_context *ev)
359 struct messaging_context *ctx = NULL;
362 status = messaging_init_internal(mem_ctx,
365 if (!NT_STATUS_IS_OK(status)) {
372 NTSTATUS messaging_init_client(TALLOC_CTX *mem_ctx,
373 struct tevent_context *ev,
374 struct messaging_context **pmsg_ctx)
376 return messaging_init_internal(mem_ctx,
381 struct server_id messaging_server_id(const struct messaging_context *msg_ctx)
387 * re-init after a fork
389 NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
394 TALLOC_FREE(msg_ctx->msg_dgm_ref);
396 msg_ctx->id = (struct server_id) {
397 .pid = getpid(), .vnn = msg_ctx->id.vnn
400 lck_path = lock_path("msg.lock");
401 if (lck_path == NULL) {
402 return NT_STATUS_NO_MEMORY;
405 msg_ctx->msg_dgm_ref = messaging_dgm_ref(
406 msg_ctx, msg_ctx->event_ctx, &msg_ctx->id.unique_id,
407 private_path("msg.sock"), lck_path,
408 messaging_recv_cb, msg_ctx, &ret);
410 if (msg_ctx->msg_dgm_ref == NULL) {
411 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
412 return map_nt_error_from_unix(ret);
415 if (lp_clustering()) {
416 ret = messaging_ctdbd_reinit(msg_ctx, msg_ctx,
420 DEBUG(1, ("messaging_ctdbd_init failed: %s\n",
422 return map_nt_error_from_unix(ret);
426 server_id_db_reinit(msg_ctx->names_db, msg_ctx->id);
433 * Register a dispatch function for a particular message type. Allow multiple
436 NTSTATUS messaging_register(struct messaging_context *msg_ctx,
439 void (*fn)(struct messaging_context *msg,
442 struct server_id server_id,
445 struct messaging_callback *cb;
447 DEBUG(5, ("Registering messaging pointer for type %u - "
449 (unsigned)msg_type, private_data));
452 * Only one callback per type
455 for (cb = msg_ctx->callbacks; cb != NULL; cb = cb->next) {
456 /* we allow a second registration of the same message
457 type if it has a different private pointer. This is
458 needed in, for example, the internal notify code,
459 which creates a new notify context for each tree
460 connect, and expects to receive messages to each of
462 if (cb->msg_type == msg_type && private_data == cb->private_data) {
463 DEBUG(5,("Overriding messaging pointer for type %u - private_data=%p\n",
464 (unsigned)msg_type, private_data));
466 cb->private_data = private_data;
471 if (!(cb = talloc(msg_ctx, struct messaging_callback))) {
472 return NT_STATUS_NO_MEMORY;
475 cb->msg_type = msg_type;
477 cb->private_data = private_data;
479 DLIST_ADD(msg_ctx->callbacks, cb);
484 De-register the function for a particular message type.
486 void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
489 struct messaging_callback *cb, *next;
491 for (cb = ctx->callbacks; cb; cb = next) {
493 if ((cb->msg_type == msg_type)
494 && (cb->private_data == private_data)) {
495 DEBUG(5,("Deregistering messaging pointer for type %u - private_data=%p\n",
496 (unsigned)msg_type, private_data));
497 DLIST_REMOVE(ctx->callbacks, cb);
504 Send a message to a particular server
506 NTSTATUS messaging_send(struct messaging_context *msg_ctx,
507 struct server_id server, uint32_t msg_type,
508 const DATA_BLOB *data)
510 struct iovec iov = {0};
513 iov.iov_base = data->data;
514 iov.iov_len = data->length;
517 return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1, NULL, 0);
520 NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
521 struct server_id server, uint32_t msg_type,
522 const uint8_t *buf, size_t len)
524 DATA_BLOB blob = data_blob_const(buf, len);
525 return messaging_send(msg_ctx, server, msg_type, &blob);
528 struct messaging_post_state {
529 struct messaging_context *msg_ctx;
530 struct messaging_rec *rec;
533 static void messaging_post_handler(struct tevent_context *ev,
534 struct tevent_immediate *ti,
537 static int messaging_post_self(struct messaging_context *msg_ctx,
538 struct server_id src, struct server_id dst,
540 const struct iovec *iov, int iovlen,
541 const int *fds, size_t num_fds)
543 struct tevent_immediate *ti;
544 struct messaging_post_state *state;
546 state = talloc(msg_ctx, struct messaging_post_state);
550 state->msg_ctx = msg_ctx;
552 ti = tevent_create_immediate(state);
556 state->rec = messaging_rec_create(
557 state, src, dst, msg_type, iov, iovlen, fds, num_fds);
558 if (state->rec == NULL) {
562 tevent_schedule_immediate(ti, msg_ctx->event_ctx,
563 messaging_post_handler, state);
571 static void messaging_post_handler(struct tevent_context *ev,
572 struct tevent_immediate *ti,
575 struct messaging_post_state *state = talloc_get_type_abort(
576 private_data, struct messaging_post_state);
577 messaging_dispatch_rec(state->msg_ctx, ev, state->rec);
581 int messaging_send_iov_from(struct messaging_context *msg_ctx,
582 struct server_id src, struct server_id dst,
584 const struct iovec *iov, int iovlen,
585 const int *fds, size_t num_fds)
588 uint8_t hdr[MESSAGE_HDR_LENGTH];
589 struct iovec iov2[iovlen+1];
591 if (server_id_is_disconnected(&dst)) {
595 if (num_fds > INT8_MAX) {
599 if (dst.vnn != msg_ctx->id.vnn) {
604 ret = msg_ctx->remote->send_fn(src, dst,
605 msg_type, iov, iovlen,
611 if (server_id_equal(&dst, &msg_ctx->id)) {
612 ret = messaging_post_self(msg_ctx, src, dst, msg_type,
613 iov, iovlen, fds, num_fds);
617 message_hdr_put(hdr, msg_type, src, dst);
618 iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
619 memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
621 ret = messaging_dgm_send(dst.pid, iov2, iovlen+1, fds, num_fds);
625 ret = messaging_dgm_send(dst.pid, iov2, iovlen+1,
630 if (ret == ECONNREFUSED) {
632 * Linux returns this when a socket exists in the file
633 * system without a listening process. This is not
634 * documented in susv4 or the linux manpages, but it's
635 * easily testable. For the higher levels this is the
636 * same as "destination does not exist"
644 NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
645 struct server_id dst, uint32_t msg_type,
646 const struct iovec *iov, int iovlen,
647 const int *fds, size_t num_fds)
651 ret = messaging_send_iov_from(msg_ctx, msg_ctx->id, dst, msg_type,
652 iov, iovlen, fds, num_fds);
654 return map_nt_error_from_unix(ret);
659 static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
660 struct messaging_rec *rec)
662 struct messaging_rec *result;
663 size_t fds_size = sizeof(int64_t) * rec->num_fds;
666 payload_len = rec->buf.length + fds_size;
667 if (payload_len < rec->buf.length) {
672 result = talloc_pooled_object(mem_ctx, struct messaging_rec, 2,
674 if (result == NULL) {
679 /* Doesn't fail, see talloc_pooled_object */
681 result->buf.data = talloc_memdup(result, rec->buf.data,
685 if (result->num_fds > 0) {
686 result->fds = talloc_memdup(result, rec->fds, fds_size);
692 struct messaging_filtered_read_state {
693 struct tevent_context *ev;
694 struct messaging_context *msg_ctx;
695 struct messaging_dgm_fde *fde;
697 bool (*filter)(struct messaging_rec *rec, void *private_data);
700 struct messaging_rec *rec;
703 static void messaging_filtered_read_cleanup(struct tevent_req *req,
704 enum tevent_req_state req_state);
706 struct tevent_req *messaging_filtered_read_send(
707 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
708 struct messaging_context *msg_ctx,
709 bool (*filter)(struct messaging_rec *rec, void *private_data),
712 struct tevent_req *req;
713 struct messaging_filtered_read_state *state;
714 size_t new_waiters_len;
716 req = tevent_req_create(mem_ctx, &state,
717 struct messaging_filtered_read_state);
722 state->msg_ctx = msg_ctx;
723 state->filter = filter;
724 state->private_data = private_data;
727 * We have to defer the callback here, as we might be called from
728 * within a different tevent_context than state->ev
730 tevent_req_defer_callback(req, state->ev);
732 state->fde = messaging_dgm_register_tevent_context(state, ev);
733 if (tevent_req_nomem(state->fde, req)) {
734 return tevent_req_post(req, ev);
738 * We add ourselves to the "new_waiters" array, not the "waiters"
739 * array. If we are called from within messaging_read_done,
740 * messaging_dispatch_rec will be in an active for-loop on
741 * "waiters". We must be careful not to mess with this array, because
742 * it could mean that a single event is being delivered twice.
745 new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
747 if (new_waiters_len == msg_ctx->num_new_waiters) {
748 struct tevent_req **tmp;
750 tmp = talloc_realloc(msg_ctx, msg_ctx->new_waiters,
751 struct tevent_req *, new_waiters_len+1);
752 if (tevent_req_nomem(tmp, req)) {
753 return tevent_req_post(req, ev);
755 msg_ctx->new_waiters = tmp;
758 msg_ctx->new_waiters[msg_ctx->num_new_waiters] = req;
759 msg_ctx->num_new_waiters += 1;
760 tevent_req_set_cleanup_fn(req, messaging_filtered_read_cleanup);
765 static void messaging_filtered_read_cleanup(struct tevent_req *req,
766 enum tevent_req_state req_state)
768 struct messaging_filtered_read_state *state = tevent_req_data(
769 req, struct messaging_filtered_read_state);
770 struct messaging_context *msg_ctx = state->msg_ctx;
773 tevent_req_set_cleanup_fn(req, NULL);
775 TALLOC_FREE(state->fde);
778 * Just set the [new_]waiters entry to NULL, be careful not to mess
779 * with the other "waiters" array contents. We are often called from
780 * within "messaging_dispatch_rec", which loops over
781 * "waiters". Messing with the "waiters" array will mess up that
785 for (i=0; i<msg_ctx->num_waiters; i++) {
786 if (msg_ctx->waiters[i] == req) {
787 msg_ctx->waiters[i] = NULL;
792 for (i=0; i<msg_ctx->num_new_waiters; i++) {
793 if (msg_ctx->new_waiters[i] == req) {
794 msg_ctx->new_waiters[i] = NULL;
800 static void messaging_filtered_read_done(struct tevent_req *req,
801 struct messaging_rec *rec)
803 struct messaging_filtered_read_state *state = tevent_req_data(
804 req, struct messaging_filtered_read_state);
806 state->rec = messaging_rec_dup(state, rec);
807 if (tevent_req_nomem(state->rec, req)) {
810 tevent_req_done(req);
813 int messaging_filtered_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
814 struct messaging_rec **presult)
816 struct messaging_filtered_read_state *state = tevent_req_data(
817 req, struct messaging_filtered_read_state);
820 if (tevent_req_is_unix_error(req, &err)) {
821 tevent_req_received(req);
824 if (presult != NULL) {
825 *presult = talloc_move(mem_ctx, &state->rec);
830 struct messaging_read_state {
832 struct messaging_rec *rec;
835 static bool messaging_read_filter(struct messaging_rec *rec,
837 static void messaging_read_done(struct tevent_req *subreq);
839 struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
840 struct tevent_context *ev,
841 struct messaging_context *msg,
844 struct tevent_req *req, *subreq;
845 struct messaging_read_state *state;
847 req = tevent_req_create(mem_ctx, &state,
848 struct messaging_read_state);
852 state->msg_type = msg_type;
854 subreq = messaging_filtered_read_send(state, ev, msg,
855 messaging_read_filter, state);
856 if (tevent_req_nomem(subreq, req)) {
857 return tevent_req_post(req, ev);
859 tevent_req_set_callback(subreq, messaging_read_done, req);
863 static bool messaging_read_filter(struct messaging_rec *rec,
866 struct messaging_read_state *state = talloc_get_type_abort(
867 private_data, struct messaging_read_state);
869 if (rec->num_fds != 0) {
873 return rec->msg_type == state->msg_type;
876 static void messaging_read_done(struct tevent_req *subreq)
878 struct tevent_req *req = tevent_req_callback_data(
879 subreq, struct tevent_req);
880 struct messaging_read_state *state = tevent_req_data(
881 req, struct messaging_read_state);
884 ret = messaging_filtered_read_recv(subreq, state, &state->rec);
886 if (tevent_req_error(req, ret)) {
889 tevent_req_done(req);
892 int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
893 struct messaging_rec **presult)
895 struct messaging_read_state *state = tevent_req_data(
896 req, struct messaging_read_state);
899 if (tevent_req_is_unix_error(req, &err)) {
902 if (presult != NULL) {
903 *presult = talloc_move(mem_ctx, &state->rec);
908 struct messaging_handler_state {
909 struct tevent_context *ev;
910 struct messaging_context *msg_ctx;
912 bool (*handler)(struct messaging_context *msg_ctx,
913 struct messaging_rec **rec, void *private_data);
917 static void messaging_handler_got_msg(struct tevent_req *subreq);
919 struct tevent_req *messaging_handler_send(
920 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
921 struct messaging_context *msg_ctx, uint32_t msg_type,
922 bool (*handler)(struct messaging_context *msg_ctx,
923 struct messaging_rec **rec, void *private_data),
926 struct tevent_req *req, *subreq;
927 struct messaging_handler_state *state;
929 req = tevent_req_create(mem_ctx, &state,
930 struct messaging_handler_state);
935 state->msg_ctx = msg_ctx;
936 state->msg_type = msg_type;
937 state->handler = handler;
938 state->private_data = private_data;
940 subreq = messaging_read_send(state, state->ev, state->msg_ctx,
942 if (tevent_req_nomem(subreq, req)) {
943 return tevent_req_post(req, ev);
945 tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
949 static void messaging_handler_got_msg(struct tevent_req *subreq)
951 struct tevent_req *req = tevent_req_callback_data(
952 subreq, struct tevent_req);
953 struct messaging_handler_state *state = tevent_req_data(
954 req, struct messaging_handler_state);
955 struct messaging_rec *rec;
959 ret = messaging_read_recv(subreq, state, &rec);
961 if (tevent_req_error(req, ret)) {
965 subreq = messaging_read_send(state, state->ev, state->msg_ctx,
967 if (tevent_req_nomem(subreq, req)) {
970 tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
972 ok = state->handler(state->msg_ctx, &rec, state->private_data);
981 tevent_req_done(req);
984 int messaging_handler_recv(struct tevent_req *req)
986 return tevent_req_simple_recv_unix(req);
989 static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
991 if (msg_ctx->num_new_waiters == 0) {
995 if (talloc_array_length(msg_ctx->waiters) <
996 (msg_ctx->num_waiters + msg_ctx->num_new_waiters)) {
997 struct tevent_req **tmp;
998 tmp = talloc_realloc(
999 msg_ctx, msg_ctx->waiters, struct tevent_req *,
1000 msg_ctx->num_waiters + msg_ctx->num_new_waiters);
1002 DEBUG(1, ("%s: talloc failed\n", __func__));
1005 msg_ctx->waiters = tmp;
1008 memcpy(&msg_ctx->waiters[msg_ctx->num_waiters], msg_ctx->new_waiters,
1009 sizeof(struct tevent_req *) * msg_ctx->num_new_waiters);
1011 msg_ctx->num_waiters += msg_ctx->num_new_waiters;
1012 msg_ctx->num_new_waiters = 0;
1017 static void messaging_dispatch_classic(struct messaging_context *msg_ctx,
1018 struct messaging_rec *rec)
1020 struct messaging_callback *cb, *next;
1022 for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
1026 if (cb->msg_type != rec->msg_type) {
1031 * the old style callbacks don't support fd passing
1033 for (j=0; j < rec->num_fds; j++) {
1034 int fd = rec->fds[j];
1040 cb->fn(msg_ctx, cb->private_data, rec->msg_type,
1041 rec->src, &rec->buf);
1044 * we continue looking for matching messages after finding
1045 * one. This matters for subsystems like the internal notify
1046 * code which register more than one handler for the same
1053 Dispatch one messaging_rec
1055 static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
1056 struct tevent_context *ev,
1057 struct messaging_rec *rec)
1062 if (ev == msg_ctx->event_ctx) {
1063 messaging_dispatch_classic(msg_ctx, rec);
1066 if (!messaging_append_new_waiters(msg_ctx)) {
1067 for (j=0; j < rec->num_fds; j++) {
1068 int fd = rec->fds[j];
1077 while (i < msg_ctx->num_waiters) {
1078 struct tevent_req *req;
1079 struct messaging_filtered_read_state *state;
1081 req = msg_ctx->waiters[i];
1084 * This got cleaned up. In the meantime,
1085 * move everything down one. We need
1086 * to keep the order of waiters, as
1087 * other code may depend on this.
1089 if (i < msg_ctx->num_waiters - 1) {
1090 memmove(&msg_ctx->waiters[i],
1091 &msg_ctx->waiters[i+1],
1092 sizeof(struct tevent_req *) *
1093 (msg_ctx->num_waiters - i - 1));
1095 msg_ctx->num_waiters -= 1;
1099 state = tevent_req_data(
1100 req, struct messaging_filtered_read_state);
1101 if ((ev == state->ev) &&
1102 state->filter(rec, state->private_data)) {
1103 messaging_filtered_read_done(req, rec);
1106 * Only the first one gets the fd-array
1115 if (ev != msg_ctx->event_ctx) {
1117 int fds[rec->num_fds];
1121 * We've been listening on a nested event
1122 * context. Messages need to be handled in the main
1123 * event context, so post to ourselves
1126 iov.iov_base = rec->buf.data;
1127 iov.iov_len = rec->buf.length;
1129 for (i=0; i<rec->num_fds; i++) {
1130 fds[i] = rec->fds[i];
1133 ret = messaging_post_self(
1134 msg_ctx, rec->src, rec->dest, rec->msg_type,
1135 &iov, 1, fds, rec->num_fds);
1142 * If the fd-array isn't used, just close it.
1144 for (j=0; j < rec->num_fds; j++) {
1145 int fd = rec->fds[j];
1152 static int mess_parent_dgm_cleanup(void *private_data);
1153 static void mess_parent_dgm_cleanup_done(struct tevent_req *req);
1155 bool messaging_parent_dgm_cleanup_init(struct messaging_context *msg)
1157 struct tevent_req *req;
1159 req = background_job_send(
1160 msg, msg->event_ctx, msg, NULL, 0,
1161 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1163 mess_parent_dgm_cleanup, msg);
1167 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1171 static int mess_parent_dgm_cleanup(void *private_data)
1175 ret = messaging_dgm_wipe();
1176 DEBUG(10, ("messaging_dgm_wipe returned %s\n",
1177 ret ? strerror(ret) : "ok"));
1178 return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1182 static void mess_parent_dgm_cleanup_done(struct tevent_req *req)
1184 struct messaging_context *msg = tevent_req_callback_data(
1185 req, struct messaging_context);
1188 status = background_job_recv(req);
1190 DEBUG(1, ("messaging dgm cleanup job ended with %s\n",
1191 nt_errstr(status)));
1193 req = background_job_send(
1194 msg, msg->event_ctx, msg, NULL, 0,
1195 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1197 mess_parent_dgm_cleanup, msg);
1199 DEBUG(1, ("background_job_send failed\n"));
1202 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1205 int messaging_cleanup(struct messaging_context *msg_ctx, pid_t pid)
1210 ret = messaging_dgm_wipe();
1212 ret = messaging_dgm_cleanup(pid);
1218 struct tevent_context *messaging_tevent_context(
1219 struct messaging_context *msg_ctx)
1221 return msg_ctx->event_ctx;
1224 struct server_id_db *messaging_names_db(struct messaging_context *msg_ctx)
1226 return msg_ctx->names_db;