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];
199 if (reg->refcount == 0) {
200 if (reg->ev != NULL) {
207 if (free_reg == NULL) {
208 tmp = talloc_realloc(ctx, ctx->event_contexts,
209 struct messaging_registered_ev,
210 num_event_contexts+1);
214 ctx->event_contexts = tmp;
216 free_reg = &ctx->event_contexts[num_event_contexts];
219 *free_reg = (struct messaging_registered_ev) { .ev = ev, .refcount = 1 };
224 static bool messaging_deregister_event_context(struct messaging_context *ctx,
225 struct tevent_context *ev)
227 size_t i, num_event_contexts;
229 num_event_contexts = talloc_array_length(ctx->event_contexts);
231 for (i=0; i<num_event_contexts; i++) {
232 struct messaging_registered_ev *reg = &ctx->event_contexts[i];
235 if (reg->refcount == 0) {
240 if (reg->refcount == 0) {
242 * Not strictly necessary, just
248 * Do not talloc_free(reg->im),
249 * recycle immediates events.
258 static void messaging_post_main_event_context(struct tevent_context *ev,
259 struct tevent_immediate *im,
262 struct messaging_context *ctx = talloc_get_type_abort(
263 private_data, struct messaging_context);
265 while (ctx->posted_msgs != NULL) {
266 struct messaging_rec *rec = ctx->posted_msgs;
269 DLIST_REMOVE(ctx->posted_msgs, rec);
271 consumed = messaging_dispatch_classic(ctx, rec);
273 consumed = messaging_dispatch_waiters(
274 ctx, ctx->event_ctx, rec);
280 for (i=0; i<rec->num_fds; i++) {
289 static void messaging_post_sub_event_context(struct tevent_context *ev,
290 struct tevent_immediate *im,
293 struct messaging_context *ctx = talloc_get_type_abort(
294 private_data, struct messaging_context);
295 struct messaging_rec *rec, *next;
297 for (rec = ctx->posted_msgs; rec != NULL; rec = next) {
302 consumed = messaging_dispatch_waiters(ctx, ev, rec);
304 DLIST_REMOVE(ctx->posted_msgs, rec);
310 static bool messaging_alert_event_contexts(struct messaging_context *ctx)
312 size_t i, num_event_contexts;
314 num_event_contexts = talloc_array_length(ctx->event_contexts);
316 for (i=0; i<num_event_contexts; i++) {
317 struct messaging_registered_ev *reg = &ctx->event_contexts[i];
319 if (reg->refcount == 0) {
323 if (reg->im == NULL) {
324 reg->im = tevent_create_immediate(
325 ctx->event_contexts);
327 if (reg->im == NULL) {
328 DBG_WARNING("Could not create immediate\n");
333 * We depend on schedule_immediate to work
334 * multiple times. Might be a bit inefficient,
335 * but this needs to be proven in tests. The
336 * alternatively would be to track whether the
337 * immediate has already been scheduled. For
338 * now, avoid that complexity here.
341 if (reg->ev == ctx->event_ctx) {
342 tevent_schedule_immediate(
344 messaging_post_main_event_context,
347 tevent_schedule_immediate(
349 messaging_post_sub_event_context,
357 static void messaging_recv_cb(struct tevent_context *ev,
358 const uint8_t *msg, size_t msg_len,
359 int *fds, size_t num_fds,
362 struct messaging_context *msg_ctx = talloc_get_type_abort(
363 private_data, struct messaging_context);
364 struct server_id_buf idbuf;
365 struct messaging_rec rec;
366 int64_t fds64[MIN(num_fds, INT8_MAX)];
369 if (msg_len < MESSAGE_HDR_LENGTH) {
370 DBG_WARNING("message too short: %zu\n", msg_len);
374 if (num_fds > INT8_MAX) {
375 DBG_WARNING("too many fds: %zu\n", num_fds);
380 * "consume" the fds by copying them and setting
381 * the original variable to -1
383 for (i=0; i < num_fds; i++) {
388 rec = (struct messaging_rec) {
389 .msg_version = MESSAGE_VERSION,
390 .buf.data = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH,
391 .buf.length = msg_len - MESSAGE_HDR_LENGTH,
396 message_hdr_get(&rec.msg_type, &rec.src, &rec.dest, msg);
398 DBG_DEBUG("Received message 0x%x len %zu (num_fds:%zu) from %s\n",
399 (unsigned)rec.msg_type, rec.buf.length, num_fds,
400 server_id_str_buf(rec.src, &idbuf));
402 messaging_dispatch_rec(msg_ctx, ev, &rec);
406 for (i=0; i < num_fds; i++) {
411 static int messaging_context_destructor(struct messaging_context *ctx)
415 for (i=0; i<ctx->num_new_waiters; i++) {
416 if (ctx->new_waiters[i] != NULL) {
417 tevent_req_set_cleanup_fn(ctx->new_waiters[i], NULL);
418 ctx->new_waiters[i] = NULL;
421 for (i=0; i<ctx->num_waiters; i++) {
422 if (ctx->waiters[i] != NULL) {
423 tevent_req_set_cleanup_fn(ctx->waiters[i], NULL);
424 ctx->waiters[i] = NULL;
429 * The immediates from messaging_alert_event_contexts
430 * reference "ctx". Don't let them outlive the
431 * messaging_context we're destroying here.
433 TALLOC_FREE(ctx->event_contexts);
438 static const char *private_path(const char *name)
440 return talloc_asprintf(talloc_tos(), "%s/%s", lp_private_dir(), name);
443 static NTSTATUS messaging_init_internal(TALLOC_CTX *mem_ctx,
444 struct tevent_context *ev,
445 struct messaging_context **pmsg_ctx)
448 struct messaging_context *ctx;
449 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
451 const char *lck_path;
452 const char *priv_path;
455 lck_path = lock_path("msg.lock");
456 if (lck_path == NULL) {
457 return NT_STATUS_NO_MEMORY;
460 ok = directory_create_or_exist_strict(lck_path,
464 DBG_DEBUG("Could not create lock directory: %s\n",
466 return NT_STATUS_ACCESS_DENIED;
469 priv_path = private_path("msg.sock");
470 if (priv_path == NULL) {
471 return NT_STATUS_NO_MEMORY;
474 ok = directory_create_or_exist_strict(priv_path, sec_initial_uid(),
477 DBG_DEBUG("Could not create msg directory: %s\n",
479 return NT_STATUS_ACCESS_DENIED;
482 frame = talloc_stackframe();
484 return NT_STATUS_NO_MEMORY;
487 ctx = talloc_zero(frame, struct messaging_context);
489 status = NT_STATUS_NO_MEMORY;
493 ctx->id = (struct server_id) {
494 .pid = getpid(), .vnn = NONCLUSTER_VNN
499 ok = messaging_register_event_context(ctx, ev);
501 status = NT_STATUS_NO_MEMORY;
507 ctx->msg_dgm_ref = messaging_dgm_ref(ctx,
515 if (ctx->msg_dgm_ref == NULL) {
516 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
517 status = map_nt_error_from_unix(ret);
520 talloc_set_destructor(ctx, messaging_context_destructor);
522 #ifdef CLUSTER_SUPPORT
523 if (lp_clustering()) {
524 ctx->msg_ctdb_ref = messaging_ctdb_ref(
526 lp_ctdbd_socket(), lp_ctdb_timeout(),
527 ctx->id.unique_id, messaging_recv_cb, ctx, &ret);
528 if (ctx->msg_ctdb_ref == NULL) {
529 DBG_NOTICE("messaging_ctdb_ref failed: %s\n",
531 status = map_nt_error_from_unix(ret);
537 ctx->id.vnn = get_my_vnn();
539 ctx->names_db = server_id_db_init(ctx,
543 TDB_INCOMPATIBLE_HASH|TDB_CLEAR_IF_FIRST);
544 if (ctx->names_db == NULL) {
545 DBG_DEBUG("server_id_db_init failed\n");
546 status = NT_STATUS_NO_MEMORY;
550 messaging_register(ctx, NULL, MSG_PING, ping_message);
552 /* Register some debugging related messages */
554 register_msg_pool_usage(ctx);
555 register_dmalloc_msgs(ctx);
556 debug_register_msgs(ctx);
559 struct server_id_buf tmp;
560 DBG_DEBUG("my id: %s\n", server_id_str_buf(ctx->id, &tmp));
563 *pmsg_ctx = talloc_steal(mem_ctx, ctx);
565 status = NT_STATUS_OK;
572 struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
573 struct tevent_context *ev)
575 struct messaging_context *ctx = NULL;
578 status = messaging_init_internal(mem_ctx,
581 if (!NT_STATUS_IS_OK(status)) {
588 NTSTATUS messaging_init_client(TALLOC_CTX *mem_ctx,
589 struct tevent_context *ev,
590 struct messaging_context **pmsg_ctx)
592 return messaging_init_internal(mem_ctx,
597 struct server_id messaging_server_id(const struct messaging_context *msg_ctx)
603 * re-init after a fork
605 NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
610 TALLOC_FREE(msg_ctx->msg_dgm_ref);
611 TALLOC_FREE(msg_ctx->msg_ctdb_ref);
613 msg_ctx->id = (struct server_id) {
614 .pid = getpid(), .vnn = msg_ctx->id.vnn
617 lck_path = lock_path("msg.lock");
618 if (lck_path == NULL) {
619 return NT_STATUS_NO_MEMORY;
622 msg_ctx->msg_dgm_ref = messaging_dgm_ref(
623 msg_ctx, msg_ctx->event_ctx, &msg_ctx->id.unique_id,
624 private_path("msg.sock"), lck_path,
625 messaging_recv_cb, msg_ctx, &ret);
627 if (msg_ctx->msg_dgm_ref == NULL) {
628 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
629 return map_nt_error_from_unix(ret);
632 if (lp_clustering()) {
633 msg_ctx->msg_ctdb_ref = messaging_ctdb_ref(
634 msg_ctx, msg_ctx->event_ctx,
635 lp_ctdbd_socket(), lp_ctdb_timeout(),
636 msg_ctx->id.unique_id, messaging_recv_cb, msg_ctx,
638 if (msg_ctx->msg_ctdb_ref == NULL) {
639 DBG_NOTICE("messaging_ctdb_ref failed: %s\n",
641 return map_nt_error_from_unix(ret);
645 server_id_db_reinit(msg_ctx->names_db, msg_ctx->id);
652 * Register a dispatch function for a particular message type. Allow multiple
655 NTSTATUS messaging_register(struct messaging_context *msg_ctx,
658 void (*fn)(struct messaging_context *msg,
661 struct server_id server_id,
664 struct messaging_callback *cb;
666 DEBUG(5, ("Registering messaging pointer for type %u - "
668 (unsigned)msg_type, private_data));
671 * Only one callback per type
674 for (cb = msg_ctx->callbacks; cb != NULL; cb = cb->next) {
675 /* we allow a second registration of the same message
676 type if it has a different private pointer. This is
677 needed in, for example, the internal notify code,
678 which creates a new notify context for each tree
679 connect, and expects to receive messages to each of
681 if (cb->msg_type == msg_type && private_data == cb->private_data) {
682 DEBUG(5,("Overriding messaging pointer for type %u - private_data=%p\n",
683 (unsigned)msg_type, private_data));
685 cb->private_data = private_data;
690 if (!(cb = talloc(msg_ctx, struct messaging_callback))) {
691 return NT_STATUS_NO_MEMORY;
694 cb->msg_type = msg_type;
696 cb->private_data = private_data;
698 DLIST_ADD(msg_ctx->callbacks, cb);
703 De-register the function for a particular message type.
705 void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
708 struct messaging_callback *cb, *next;
710 for (cb = ctx->callbacks; cb; cb = next) {
712 if ((cb->msg_type == msg_type)
713 && (cb->private_data == private_data)) {
714 DEBUG(5,("Deregistering messaging pointer for type %u - private_data=%p\n",
715 (unsigned)msg_type, private_data));
716 DLIST_REMOVE(ctx->callbacks, cb);
723 Send a message to a particular server
725 NTSTATUS messaging_send(struct messaging_context *msg_ctx,
726 struct server_id server, uint32_t msg_type,
727 const DATA_BLOB *data)
729 struct iovec iov = {0};
732 iov.iov_base = data->data;
733 iov.iov_len = data->length;
736 return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1, NULL, 0);
739 NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
740 struct server_id server, uint32_t msg_type,
741 const uint8_t *buf, size_t len)
743 DATA_BLOB blob = data_blob_const(buf, len);
744 return messaging_send(msg_ctx, server, msg_type, &blob);
747 static int messaging_post_self(struct messaging_context *msg_ctx,
748 struct server_id src, struct server_id dst,
750 const struct iovec *iov, int iovlen,
751 const int *fds, size_t num_fds)
753 struct messaging_rec *rec;
756 rec = messaging_rec_create(
757 msg_ctx, src, dst, msg_type, iov, iovlen, fds, num_fds);
762 ok = messaging_alert_event_contexts(msg_ctx);
768 DLIST_ADD_END(msg_ctx->posted_msgs, rec);
773 int messaging_send_iov_from(struct messaging_context *msg_ctx,
774 struct server_id src, struct server_id dst,
776 const struct iovec *iov, int iovlen,
777 const int *fds, size_t num_fds)
780 uint8_t hdr[MESSAGE_HDR_LENGTH];
781 struct iovec iov2[iovlen+1];
783 if (server_id_is_disconnected(&dst)) {
787 if (num_fds > INT8_MAX) {
791 if (server_id_equal(&dst, &msg_ctx->id)) {
792 ret = messaging_post_self(msg_ctx, src, dst, msg_type,
793 iov, iovlen, fds, num_fds);
797 message_hdr_put(hdr, msg_type, src, dst);
798 iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
799 memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
801 if (dst.vnn != msg_ctx->id.vnn) {
806 ret = messaging_ctdb_send(dst.vnn, dst.pid, iov2, iovlen+1);
810 ret = messaging_dgm_send(dst.pid, iov2, iovlen+1, fds, num_fds);
814 ret = messaging_dgm_send(dst.pid, iov2, iovlen+1,
819 if (ret == ECONNREFUSED) {
821 * Linux returns this when a socket exists in the file
822 * system without a listening process. This is not
823 * documented in susv4 or the linux manpages, but it's
824 * easily testable. For the higher levels this is the
825 * same as "destination does not exist"
833 NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
834 struct server_id dst, uint32_t msg_type,
835 const struct iovec *iov, int iovlen,
836 const int *fds, size_t num_fds)
840 ret = messaging_send_iov_from(msg_ctx, msg_ctx->id, dst, msg_type,
841 iov, iovlen, fds, num_fds);
843 return map_nt_error_from_unix(ret);
848 struct send_all_state {
849 struct messaging_context *msg_ctx;
855 static int send_all_fn(pid_t pid, void *private_data)
857 struct send_all_state *state = private_data;
860 status = messaging_send_buf(state->msg_ctx, pid_to_procid(pid),
861 state->msg_type, state->buf, state->len);
862 if (!NT_STATUS_IS_OK(status)) {
863 DBG_WARNING("messaging_send_buf to %ju failed: %s\n",
864 (uintmax_t)pid, nt_errstr(status));
870 void messaging_send_all(struct messaging_context *msg_ctx,
871 int msg_type, const void *buf, size_t len)
873 struct send_all_state state = {
874 .msg_ctx = msg_ctx, .msg_type = msg_type,
875 .buf = buf, .len = len
879 #ifdef CLUSTER_SUPPORT
880 if (lp_clustering()) {
881 struct ctdbd_connection *conn = messaging_ctdb_connection();
882 uint8_t msghdr[MESSAGE_HDR_LENGTH];
883 struct iovec iov[] = {
884 { .iov_base = msghdr,
885 .iov_len = sizeof(msghdr) },
886 { .iov_base = discard_const_p(void, buf),
890 message_hdr_put(msghdr, msg_type, messaging_server_id(msg_ctx),
891 (struct server_id) {0});
893 ret = ctdbd_messaging_send_iov(
894 conn, CTDB_BROADCAST_CONNECTED,
895 CTDB_SRVID_SAMBA_PROCESS,
896 iov, ARRAY_SIZE(iov));
898 DBG_WARNING("ctdbd_messaging_send_iov failed: %s\n",
906 ret = messaging_dgm_forall(send_all_fn, &state);
908 DBG_WARNING("messaging_dgm_forall failed: %s\n",
913 static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
914 struct messaging_rec *rec)
916 struct messaging_rec *result;
917 size_t fds_size = sizeof(int64_t) * rec->num_fds;
920 payload_len = rec->buf.length + fds_size;
921 if (payload_len < rec->buf.length) {
926 result = talloc_pooled_object(mem_ctx, struct messaging_rec, 2,
928 if (result == NULL) {
933 /* Doesn't fail, see talloc_pooled_object */
935 result->buf.data = talloc_memdup(result, rec->buf.data,
939 if (result->num_fds > 0) {
940 result->fds = talloc_memdup(result, rec->fds, fds_size);
946 struct messaging_filtered_read_state {
947 struct tevent_context *ev;
948 struct messaging_context *msg_ctx;
949 struct messaging_dgm_fde *fde;
950 struct messaging_ctdb_fde *cluster_fde;
952 bool (*filter)(struct messaging_rec *rec, void *private_data);
955 struct messaging_rec *rec;
958 static void messaging_filtered_read_cleanup(struct tevent_req *req,
959 enum tevent_req_state req_state);
961 struct tevent_req *messaging_filtered_read_send(
962 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
963 struct messaging_context *msg_ctx,
964 bool (*filter)(struct messaging_rec *rec, void *private_data),
967 struct tevent_req *req;
968 struct messaging_filtered_read_state *state;
969 size_t new_waiters_len;
972 req = tevent_req_create(mem_ctx, &state,
973 struct messaging_filtered_read_state);
978 state->msg_ctx = msg_ctx;
979 state->filter = filter;
980 state->private_data = private_data;
983 * We have to defer the callback here, as we might be called from
984 * within a different tevent_context than state->ev
986 tevent_req_defer_callback(req, state->ev);
988 state->fde = messaging_dgm_register_tevent_context(state, ev);
989 if (tevent_req_nomem(state->fde, req)) {
990 return tevent_req_post(req, ev);
993 if (lp_clustering()) {
995 messaging_ctdb_register_tevent_context(state, ev);
996 if (tevent_req_nomem(state->cluster_fde, req)) {
997 return tevent_req_post(req, ev);
1002 * We add ourselves to the "new_waiters" array, not the "waiters"
1003 * array. If we are called from within messaging_read_done,
1004 * messaging_dispatch_rec will be in an active for-loop on
1005 * "waiters". We must be careful not to mess with this array, because
1006 * it could mean that a single event is being delivered twice.
1009 new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
1011 if (new_waiters_len == msg_ctx->num_new_waiters) {
1012 struct tevent_req **tmp;
1014 tmp = talloc_realloc(msg_ctx, msg_ctx->new_waiters,
1015 struct tevent_req *, new_waiters_len+1);
1016 if (tevent_req_nomem(tmp, req)) {
1017 return tevent_req_post(req, ev);
1019 msg_ctx->new_waiters = tmp;
1022 msg_ctx->new_waiters[msg_ctx->num_new_waiters] = req;
1023 msg_ctx->num_new_waiters += 1;
1024 tevent_req_set_cleanup_fn(req, messaging_filtered_read_cleanup);
1026 ok = messaging_register_event_context(msg_ctx, ev);
1028 tevent_req_oom(req);
1029 return tevent_req_post(req, ev);
1035 static void messaging_filtered_read_cleanup(struct tevent_req *req,
1036 enum tevent_req_state req_state)
1038 struct messaging_filtered_read_state *state = tevent_req_data(
1039 req, struct messaging_filtered_read_state);
1040 struct messaging_context *msg_ctx = state->msg_ctx;
1044 tevent_req_set_cleanup_fn(req, NULL);
1046 TALLOC_FREE(state->fde);
1047 TALLOC_FREE(state->cluster_fde);
1049 ok = messaging_deregister_event_context(msg_ctx, state->ev);
1055 * Just set the [new_]waiters entry to NULL, be careful not to mess
1056 * with the other "waiters" array contents. We are often called from
1057 * within "messaging_dispatch_rec", which loops over
1058 * "waiters". Messing with the "waiters" array will mess up that
1062 for (i=0; i<msg_ctx->num_waiters; i++) {
1063 if (msg_ctx->waiters[i] == req) {
1064 msg_ctx->waiters[i] = NULL;
1069 for (i=0; i<msg_ctx->num_new_waiters; i++) {
1070 if (msg_ctx->new_waiters[i] == req) {
1071 msg_ctx->new_waiters[i] = NULL;
1077 static void messaging_filtered_read_done(struct tevent_req *req,
1078 struct messaging_rec *rec)
1080 struct messaging_filtered_read_state *state = tevent_req_data(
1081 req, struct messaging_filtered_read_state);
1083 state->rec = messaging_rec_dup(state, rec);
1084 if (tevent_req_nomem(state->rec, req)) {
1087 tevent_req_done(req);
1090 int messaging_filtered_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1091 struct messaging_rec **presult)
1093 struct messaging_filtered_read_state *state = tevent_req_data(
1094 req, struct messaging_filtered_read_state);
1097 if (tevent_req_is_unix_error(req, &err)) {
1098 tevent_req_received(req);
1101 if (presult != NULL) {
1102 *presult = talloc_move(mem_ctx, &state->rec);
1107 struct messaging_read_state {
1109 struct messaging_rec *rec;
1112 static bool messaging_read_filter(struct messaging_rec *rec,
1113 void *private_data);
1114 static void messaging_read_done(struct tevent_req *subreq);
1116 struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
1117 struct tevent_context *ev,
1118 struct messaging_context *msg,
1121 struct tevent_req *req, *subreq;
1122 struct messaging_read_state *state;
1124 req = tevent_req_create(mem_ctx, &state,
1125 struct messaging_read_state);
1129 state->msg_type = msg_type;
1131 subreq = messaging_filtered_read_send(state, ev, msg,
1132 messaging_read_filter, state);
1133 if (tevent_req_nomem(subreq, req)) {
1134 return tevent_req_post(req, ev);
1136 tevent_req_set_callback(subreq, messaging_read_done, req);
1140 static bool messaging_read_filter(struct messaging_rec *rec,
1143 struct messaging_read_state *state = talloc_get_type_abort(
1144 private_data, struct messaging_read_state);
1146 if (rec->num_fds != 0) {
1150 return rec->msg_type == state->msg_type;
1153 static void messaging_read_done(struct tevent_req *subreq)
1155 struct tevent_req *req = tevent_req_callback_data(
1156 subreq, struct tevent_req);
1157 struct messaging_read_state *state = tevent_req_data(
1158 req, struct messaging_read_state);
1161 ret = messaging_filtered_read_recv(subreq, state, &state->rec);
1162 TALLOC_FREE(subreq);
1163 if (tevent_req_error(req, ret)) {
1166 tevent_req_done(req);
1169 int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1170 struct messaging_rec **presult)
1172 struct messaging_read_state *state = tevent_req_data(
1173 req, struct messaging_read_state);
1176 if (tevent_req_is_unix_error(req, &err)) {
1179 if (presult != NULL) {
1180 *presult = talloc_move(mem_ctx, &state->rec);
1185 static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
1187 if (msg_ctx->num_new_waiters == 0) {
1191 if (talloc_array_length(msg_ctx->waiters) <
1192 (msg_ctx->num_waiters + msg_ctx->num_new_waiters)) {
1193 struct tevent_req **tmp;
1194 tmp = talloc_realloc(
1195 msg_ctx, msg_ctx->waiters, struct tevent_req *,
1196 msg_ctx->num_waiters + msg_ctx->num_new_waiters);
1198 DEBUG(1, ("%s: talloc failed\n", __func__));
1201 msg_ctx->waiters = tmp;
1204 memcpy(&msg_ctx->waiters[msg_ctx->num_waiters], msg_ctx->new_waiters,
1205 sizeof(struct tevent_req *) * msg_ctx->num_new_waiters);
1207 msg_ctx->num_waiters += msg_ctx->num_new_waiters;
1208 msg_ctx->num_new_waiters = 0;
1213 static bool messaging_dispatch_classic(struct messaging_context *msg_ctx,
1214 struct messaging_rec *rec)
1216 struct messaging_callback *cb, *next;
1218 for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
1222 if (cb->msg_type != rec->msg_type) {
1227 * the old style callbacks don't support fd passing
1229 for (j=0; j < rec->num_fds; j++) {
1230 int fd = rec->fds[j];
1236 cb->fn(msg_ctx, cb->private_data, rec->msg_type,
1237 rec->src, &rec->buf);
1245 static bool messaging_dispatch_waiters(struct messaging_context *msg_ctx,
1246 struct tevent_context *ev,
1247 struct messaging_rec *rec)
1251 if (!messaging_append_new_waiters(msg_ctx)) {
1256 while (i < msg_ctx->num_waiters) {
1257 struct tevent_req *req;
1258 struct messaging_filtered_read_state *state;
1260 req = msg_ctx->waiters[i];
1263 * This got cleaned up. In the meantime,
1264 * move everything down one. We need
1265 * to keep the order of waiters, as
1266 * other code may depend on this.
1268 if (i < msg_ctx->num_waiters - 1) {
1269 memmove(&msg_ctx->waiters[i],
1270 &msg_ctx->waiters[i+1],
1271 sizeof(struct tevent_req *) *
1272 (msg_ctx->num_waiters - i - 1));
1274 msg_ctx->num_waiters -= 1;
1278 state = tevent_req_data(
1279 req, struct messaging_filtered_read_state);
1280 if ((ev == state->ev) &&
1281 state->filter(rec, state->private_data)) {
1282 messaging_filtered_read_done(req, rec);
1293 Dispatch one messaging_rec
1295 static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
1296 struct tevent_context *ev,
1297 struct messaging_rec *rec)
1302 if (ev == msg_ctx->event_ctx) {
1303 consumed = messaging_dispatch_classic(msg_ctx, rec);
1309 consumed = messaging_dispatch_waiters(msg_ctx, ev, rec);
1314 if (ev != msg_ctx->event_ctx) {
1316 int fds[rec->num_fds];
1320 * We've been listening on a nested event
1321 * context. Messages need to be handled in the main
1322 * event context, so post to ourselves
1325 iov.iov_base = rec->buf.data;
1326 iov.iov_len = rec->buf.length;
1328 for (i=0; i<rec->num_fds; i++) {
1329 fds[i] = rec->fds[i];
1332 ret = messaging_post_self(
1333 msg_ctx, rec->src, rec->dest, rec->msg_type,
1334 &iov, 1, fds, rec->num_fds);
1341 * If the fd-array isn't used, just close it.
1343 for (i=0; i < rec->num_fds; i++) {
1344 int fd = rec->fds[i];
1351 static int mess_parent_dgm_cleanup(void *private_data);
1352 static void mess_parent_dgm_cleanup_done(struct tevent_req *req);
1354 bool messaging_parent_dgm_cleanup_init(struct messaging_context *msg)
1356 struct tevent_req *req;
1358 req = background_job_send(
1359 msg, msg->event_ctx, msg, NULL, 0,
1360 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1362 mess_parent_dgm_cleanup, msg);
1364 DBG_WARNING("background_job_send failed\n");
1367 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1371 static int mess_parent_dgm_cleanup(void *private_data)
1375 ret = messaging_dgm_wipe();
1376 DEBUG(10, ("messaging_dgm_wipe returned %s\n",
1377 ret ? strerror(ret) : "ok"));
1378 return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1382 static void mess_parent_dgm_cleanup_done(struct tevent_req *req)
1384 struct messaging_context *msg = tevent_req_callback_data(
1385 req, struct messaging_context);
1388 status = background_job_recv(req);
1390 DEBUG(1, ("messaging dgm cleanup job ended with %s\n",
1391 nt_errstr(status)));
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 DEBUG(1, ("background_job_send failed\n"));
1402 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1405 int messaging_cleanup(struct messaging_context *msg_ctx, pid_t pid)
1410 ret = messaging_dgm_wipe();
1412 ret = messaging_dgm_cleanup(pid);
1418 struct tevent_context *messaging_tevent_context(
1419 struct messaging_context *msg_ctx)
1421 return msg_ctx->event_ctx;
1424 struct server_id_db *messaging_names_db(struct messaging_context *msg_ctx)
1426 return msg_ctx->names_db;