Copyright (C) 2001 by Martin Pool
Copyright (C) 2002 by Jeremy Allison
Copyright (C) 2007 by Volker Lendecke
-
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
-
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
@defgroup messages Internal messaging framework
@{
@file messages.c
-
+
@brief Module for internal messaging between Samba daemons.
The idea is that if a part of Samba wants to do communication with
*/
#include "includes.h"
-#include "dbwrap.h"
+#include "dbwrap/dbwrap.h"
#include "serverid.h"
#include "messages.h"
+#include "lib/util/tevent_unix.h"
+#include "lib/background.h"
struct messaging_callback {
struct messaging_callback *prev, *next;
struct server_id src,
DATA_BLOB *data)
{
- const char *msg = data->data ? (const char *)data->data : "none";
+ const char *msg = "none";
+ char *free_me = NULL;
+ if (data->data != NULL) {
+ free_me = talloc_strndup(talloc_tos(), (char *)data->data,
+ data->length);
+ msg = free_me;
+ }
DEBUG(1,("INFO: Received PING message from PID %s [%s]\n",
procid_str_static(&src), msg));
+ TALLOC_FREE(free_me);
messaging_send(msg_ctx, src, MSG_PONG, data);
}
* the msg has already been deleted from the messages.tdb.*/
status = messaging_send_buf(msg_all->msg_ctx, *id, msg_all->msg_type,
- (const uint8 *)msg_all->buf, msg_all->len);
+ (const uint8_t *)msg_all->buf, msg_all->len);
if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
-
- /* If the pid was not found delete the entry from connections.tdb */
+
+ /*
+ * If the pid was not found delete the entry from
+ * serverid.tdb
+ */
DEBUG(2, ("pid %s doesn't exist\n", procid_str_static(id)));
- rec->delete_rec(rec);
+ dbwrap_record_delete(rec);
}
msg_all->n_sent++;
return 0;
struct msg_all msg_all;
msg_all.msg_type = msg_type;
- if (msg_type < 1000)
+ if (msg_type < 0x100) {
msg_all.msg_flag = FLAG_MSG_GENERAL;
- else if (msg_type > 1000 && msg_type < 2000)
+ } else if (msg_type > 0x100 && msg_type < 0x200) {
msg_all.msg_flag = FLAG_MSG_NMBD;
- else if (msg_type > 2000 && msg_type < 2100)
- msg_all.msg_flag = FLAG_MSG_PRINT_NOTIFY;
- else if (msg_type > 2100 && msg_type < 3000)
+ } else if (msg_type > 0x200 && msg_type < 0x300) {
msg_all.msg_flag = FLAG_MSG_PRINT_GENERAL;
- else if (msg_type > 3000 && msg_type < 4000)
+ } else if (msg_type > 0x300 && msg_type < 0x400) {
msg_all.msg_flag = FLAG_MSG_SMBD;
- else if (msg_type > 4000 && msg_type < 5000)
+ } else if (msg_type > 0x400 && msg_type < 0x600) {
+ msg_all.msg_flag = FLAG_MSG_WINBIND;
+ } else if (msg_type > 4000 && msg_type < 5000) {
msg_all.msg_flag = FLAG_MSG_DBWRAP;
- else
- return False;
+ } else {
+ return false;
+ }
msg_all.buf = buf;
msg_all.len = len;
serverid_traverse(traverse_fn, &msg_all);
if (n_sent)
*n_sent = msg_all.n_sent;
- return True;
-}
-
-struct event_context *messaging_event_context(struct messaging_context *msg_ctx)
-{
- return msg_ctx->event_ctx;
+ return true;
}
struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
- struct server_id server_id,
- struct event_context *ev)
+ struct tevent_context *ev)
{
struct messaging_context *ctx;
NTSTATUS status;
- if (!(ctx = TALLOC_ZERO_P(mem_ctx, struct messaging_context))) {
+ if (!(ctx = talloc_zero(mem_ctx, struct messaging_context))) {
return NULL;
}
- ctx->id = server_id;
+ ctx->id = procid_self();
ctx->event_ctx = ev;
- status = messaging_tdb_init(ctx, ctx, &ctx->local);
+ status = messaging_dgm_init(ctx, ctx, &ctx->local);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(2, ("messaging_tdb_init failed: %s\n",
+ DEBUG(2, ("messaging_dgm_init failed: %s\n",
nt_errstr(status)));
TALLOC_FREE(ctx);
return NULL;
}
-#ifdef CLUSTER_SUPPORT
if (lp_clustering()) {
status = messaging_ctdbd_init(ctx, ctx, &ctx->remote);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(2, ("messaging_ctdb_init failed: %s\n",
+ DEBUG(2, ("messaging_ctdbd_init failed: %s\n",
nt_errstr(status)));
TALLOC_FREE(ctx);
return NULL;
}
}
ctx->id.vnn = get_my_vnn();
-#endif
messaging_register(ctx, NULL, MSG_PING, ping_message);
/*
* re-init after a fork
*/
-NTSTATUS messaging_reinit(struct messaging_context *msg_ctx,
- struct server_id id)
+NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
{
NTSTATUS status;
TALLOC_FREE(msg_ctx->local);
- msg_ctx->id = id;
+ msg_ctx->id = procid_self();
- status = messaging_tdb_init(msg_ctx, msg_ctx, &msg_ctx->local);
+ status = messaging_dgm_init(msg_ctx, msg_ctx, &msg_ctx->local);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(0, ("messaging_tdb_init failed: %s\n",
+ DEBUG(0, ("messaging_dgm_init failed: %s\n",
nt_errstr(status)));
return status;
}
-#ifdef CLUSTER_SUPPORT
TALLOC_FREE(msg_ctx->remote);
if (lp_clustering()) {
&msg_ctx->remote);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("messaging_ctdb_init failed: %s\n",
+ DEBUG(1, ("messaging_ctdbd_init failed: %s\n",
nt_errstr(status)));
return status;
}
}
-#endif
-
return NT_STATUS_OK;
}
{
struct messaging_callback *cb;
+ DEBUG(5, ("Registering messaging pointer for type %u - "
+ "private_data=%p\n",
+ (unsigned)msg_type, private_data));
+
/*
* Only one callback per type
*/
}
}
+static bool messaging_is_self_send(const struct messaging_context *msg_ctx,
+ const struct server_id *dst)
+{
+ return ((msg_ctx->id.vnn == dst->vnn) &&
+ (msg_ctx->id.pid == dst->pid));
+}
+
/*
Send a message to a particular server
*/
struct server_id server, uint32_t msg_type,
const DATA_BLOB *data)
{
-#ifdef CLUSTER_SUPPORT
- if (!procid_is_local(&server)) {
- return msg_ctx->remote->send_fn(msg_ctx, server,
- msg_type, data,
- msg_ctx->remote);
- }
-#endif
- return msg_ctx->local->send_fn(msg_ctx, server, msg_type, data,
- msg_ctx->local);
+ struct iovec iov;
+
+ iov.iov_base = data->data;
+ iov.iov_len = data->length;
+
+ return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1);
}
NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
struct server_id server, uint32_t msg_type,
- const uint8 *buf, size_t len)
+ const uint8_t *buf, size_t len)
{
DATA_BLOB blob = data_blob_const(buf, len);
return messaging_send(msg_ctx, server, msg_type, &blob);
}
+NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
+ struct server_id server, uint32_t msg_type,
+ const struct iovec *iov, int iovlen)
+{
+ if (server_id_is_disconnected(&server)) {
+ return NT_STATUS_INVALID_PARAMETER_MIX;
+ }
+
+ if (!procid_is_local(&server)) {
+ return msg_ctx->remote->send_fn(msg_ctx->id, server,
+ msg_type, iov, iovlen,
+ msg_ctx->remote);
+ }
+
+ if (messaging_is_self_send(msg_ctx, &server)) {
+ struct messaging_rec rec;
+ uint8_t *buf;
+ DATA_BLOB data;
+
+ buf = iov_buf(talloc_tos(), iov, iovlen);
+ if (buf == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ data = data_blob_const(buf, talloc_get_size(buf));
+
+ rec.msg_version = MESSAGE_VERSION;
+ rec.msg_type = msg_type & MSG_TYPE_MASK;
+ rec.dest = server;
+ rec.src = msg_ctx->id;
+ rec.buf = data;
+ messaging_dispatch_rec(msg_ctx, &rec);
+ TALLOC_FREE(buf);
+ return NT_STATUS_OK;
+ }
+
+ return msg_ctx->local->send_fn(msg_ctx->id, server, msg_type,
+ iov, iovlen, msg_ctx->local);
+}
+
+static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
+ struct messaging_rec *rec)
+{
+ struct messaging_rec *result;
+
+ result = talloc_pooled_object(mem_ctx, struct messaging_rec,
+ 1, rec->buf.length);
+ if (result == NULL) {
+ return NULL;
+ }
+ *result = *rec;
+
+ /* Doesn't fail, see talloc_pooled_object */
+
+ result->buf.data = talloc_memdup(result, rec->buf.data,
+ rec->buf.length);
+ return result;
+}
+
+struct messaging_filtered_read_state {
+ struct tevent_context *ev;
+ struct messaging_context *msg_ctx;
+ void *tevent_handle;
+
+ bool (*filter)(struct messaging_rec *rec, void *private_data);
+ void *private_data;
+
+ struct messaging_rec *rec;
+};
+
+static void messaging_filtered_read_cleanup(struct tevent_req *req,
+ enum tevent_req_state req_state);
+
+struct tevent_req *messaging_filtered_read_send(
+ TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+ struct messaging_context *msg_ctx,
+ bool (*filter)(struct messaging_rec *rec, void *private_data),
+ void *private_data)
+{
+ struct tevent_req *req;
+ struct messaging_filtered_read_state *state;
+ size_t new_waiters_len;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct messaging_filtered_read_state);
+ if (req == NULL) {
+ return NULL;
+ }
+ state->ev = ev;
+ state->msg_ctx = msg_ctx;
+ state->filter = filter;
+ state->private_data = private_data;
+
+ /*
+ * We have to defer the callback here, as we might be called from
+ * within a different tevent_context than state->ev
+ */
+ tevent_req_defer_callback(req, state->ev);
+
+ state->tevent_handle = messaging_dgm_register_tevent_context(
+ state, msg_ctx, ev);
+ if (tevent_req_nomem(state, req)) {
+ return tevent_req_post(req, ev);
+ }
+
+ /*
+ * We add ourselves to the "new_waiters" array, not the "waiters"
+ * array. If we are called from within messaging_read_done,
+ * messaging_dispatch_rec will be in an active for-loop on
+ * "waiters". We must be careful not to mess with this array, because
+ * it could mean that a single event is being delivered twice.
+ */
+
+ new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
+
+ if (new_waiters_len == msg_ctx->num_new_waiters) {
+ struct tevent_req **tmp;
+
+ tmp = talloc_realloc(msg_ctx, msg_ctx->new_waiters,
+ struct tevent_req *, new_waiters_len+1);
+ if (tevent_req_nomem(tmp, req)) {
+ return tevent_req_post(req, ev);
+ }
+ msg_ctx->new_waiters = tmp;
+ }
+
+ msg_ctx->new_waiters[msg_ctx->num_new_waiters] = req;
+ msg_ctx->num_new_waiters += 1;
+ tevent_req_set_cleanup_fn(req, messaging_filtered_read_cleanup);
+
+ return req;
+}
+
+static void messaging_filtered_read_cleanup(struct tevent_req *req,
+ enum tevent_req_state req_state)
+{
+ struct messaging_filtered_read_state *state = tevent_req_data(
+ req, struct messaging_filtered_read_state);
+ struct messaging_context *msg_ctx = state->msg_ctx;
+ unsigned i;
+
+ tevent_req_set_cleanup_fn(req, NULL);
+
+ TALLOC_FREE(state->tevent_handle);
+
+ /*
+ * Just set the [new_]waiters entry to NULL, be careful not to mess
+ * with the other "waiters" array contents. We are often called from
+ * within "messaging_dispatch_rec", which loops over
+ * "waiters". Messing with the "waiters" array will mess up that
+ * for-loop.
+ */
+
+ for (i=0; i<msg_ctx->num_waiters; i++) {
+ if (msg_ctx->waiters[i] == req) {
+ msg_ctx->waiters[i] = NULL;
+ return;
+ }
+ }
+
+ for (i=0; i<msg_ctx->num_new_waiters; i++) {
+ if (msg_ctx->new_waiters[i] == req) {
+ msg_ctx->new_waiters[i] = NULL;
+ return;
+ }
+ }
+}
+
+static void messaging_filtered_read_done(struct tevent_req *req,
+ struct messaging_rec *rec)
+{
+ struct messaging_filtered_read_state *state = tevent_req_data(
+ req, struct messaging_filtered_read_state);
+
+ state->rec = messaging_rec_dup(state, rec);
+ if (tevent_req_nomem(state->rec, req)) {
+ return;
+ }
+ tevent_req_done(req);
+}
+
+int messaging_filtered_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+ struct messaging_rec **presult)
+{
+ struct messaging_filtered_read_state *state = tevent_req_data(
+ req, struct messaging_filtered_read_state);
+ int err;
+
+ if (tevent_req_is_unix_error(req, &err)) {
+ tevent_req_received(req);
+ return err;
+ }
+ *presult = talloc_move(mem_ctx, &state->rec);
+ return 0;
+}
+
+struct messaging_read_state {
+ uint32_t msg_type;
+ struct messaging_rec *rec;
+};
+
+static bool messaging_read_filter(struct messaging_rec *rec,
+ void *private_data);
+static void messaging_read_done(struct tevent_req *subreq);
+
+struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct messaging_context *msg,
+ uint32_t msg_type)
+{
+ struct tevent_req *req, *subreq;
+ struct messaging_read_state *state;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct messaging_read_state);
+ if (req == NULL) {
+ return NULL;
+ }
+ state->msg_type = msg_type;
+
+ subreq = messaging_filtered_read_send(state, ev, msg,
+ messaging_read_filter, state);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, messaging_read_done, req);
+ return req;
+}
+
+static bool messaging_read_filter(struct messaging_rec *rec,
+ void *private_data)
+{
+ struct messaging_read_state *state = talloc_get_type_abort(
+ private_data, struct messaging_read_state);
+
+ return rec->msg_type == state->msg_type;
+}
+
+static void messaging_read_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct messaging_read_state *state = tevent_req_data(
+ req, struct messaging_read_state);
+ int ret;
+
+ ret = messaging_filtered_read_recv(subreq, state, &state->rec);
+ TALLOC_FREE(subreq);
+ if (tevent_req_error(req, ret)) {
+ return;
+ }
+ tevent_req_done(req);
+}
+
+int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+ struct messaging_rec **presult)
+{
+ struct messaging_read_state *state = tevent_req_data(
+ req, struct messaging_read_state);
+ int err;
+
+ if (tevent_req_is_unix_error(req, &err)) {
+ return err;
+ }
+ if (presult != NULL) {
+ *presult = talloc_move(mem_ctx, &state->rec);
+ }
+ return 0;
+}
+
+static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
+{
+ if (msg_ctx->num_new_waiters == 0) {
+ return true;
+ }
+
+ if (talloc_array_length(msg_ctx->waiters) <
+ (msg_ctx->num_waiters + msg_ctx->num_new_waiters)) {
+ struct tevent_req **tmp;
+ tmp = talloc_realloc(
+ msg_ctx, msg_ctx->waiters, struct tevent_req *,
+ msg_ctx->num_waiters + msg_ctx->num_new_waiters);
+ if (tmp == NULL) {
+ DEBUG(1, ("%s: talloc failed\n", __func__));
+ return false;
+ }
+ msg_ctx->waiters = tmp;
+ }
+
+ memcpy(&msg_ctx->waiters[msg_ctx->num_waiters], msg_ctx->new_waiters,
+ sizeof(struct tevent_req *) * msg_ctx->num_new_waiters);
+
+ msg_ctx->num_waiters += msg_ctx->num_new_waiters;
+ msg_ctx->num_new_waiters = 0;
+
+ return true;
+}
+
+struct messaging_defer_callback_state {
+ struct messaging_context *msg_ctx;
+ struct messaging_rec *rec;
+ void (*fn)(struct messaging_context *msg, void *private_data,
+ uint32_t msg_type, struct server_id server_id,
+ DATA_BLOB *data);
+ void *private_data;
+};
+
+static void messaging_defer_callback_trigger(struct tevent_context *ev,
+ struct tevent_immediate *im,
+ void *private_data);
+
+static void messaging_defer_callback(
+ struct messaging_context *msg_ctx, struct messaging_rec *rec,
+ void (*fn)(struct messaging_context *msg, void *private_data,
+ uint32_t msg_type, struct server_id server_id,
+ DATA_BLOB *data),
+ void *private_data)
+{
+ struct messaging_defer_callback_state *state;
+ struct tevent_immediate *im;
+
+ state = talloc(msg_ctx, struct messaging_defer_callback_state);
+ if (state == NULL) {
+ DEBUG(1, ("talloc failed\n"));
+ return;
+ }
+ state->msg_ctx = msg_ctx;
+ state->fn = fn;
+ state->private_data = private_data;
+
+ state->rec = messaging_rec_dup(state, rec);
+ if (state->rec == NULL) {
+ DEBUG(1, ("talloc failed\n"));
+ TALLOC_FREE(state);
+ return;
+ }
+
+ im = tevent_create_immediate(state);
+ if (im == NULL) {
+ DEBUG(1, ("tevent_create_immediate failed\n"));
+ TALLOC_FREE(state);
+ return;
+ }
+ tevent_schedule_immediate(im, msg_ctx->event_ctx,
+ messaging_defer_callback_trigger, state);
+}
+
+static void messaging_defer_callback_trigger(struct tevent_context *ev,
+ struct tevent_immediate *im,
+ void *private_data)
+{
+ struct messaging_defer_callback_state *state = talloc_get_type_abort(
+ private_data, struct messaging_defer_callback_state);
+ struct messaging_rec *rec = state->rec;
+
+ state->fn(state->msg_ctx, state->private_data, rec->msg_type, rec->src,
+ &rec->buf);
+ TALLOC_FREE(state);
+}
+
/*
Dispatch one messaging_rec
*/
struct messaging_rec *rec)
{
struct messaging_callback *cb, *next;
+ unsigned i;
for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
next = cb->next;
- if (cb->msg_type == rec->msg_type) {
+ if (cb->msg_type != rec->msg_type) {
+ continue;
+ }
+
+ if (messaging_is_self_send(msg_ctx, &rec->dest)) {
+ /*
+ * This is a self-send. We are called here from
+ * messaging_send(), and we don't want to directly
+ * recurse into the callback but go via a
+ * tevent_loop_once
+ */
+ messaging_defer_callback(msg_ctx, rec, cb->fn,
+ cb->private_data);
+ } else {
+ /*
+ * This comes from a different process. we are called
+ * from the event loop, so we should call back
+ * directly.
+ */
cb->fn(msg_ctx, cb->private_data, rec->msg_type,
rec->src, &rec->buf);
- /* we continue looking for matching messages
- after finding one. This matters for
- subsystems like the internal notify code
- which register more than one handler for
- the same message type */
}
+ /*
+ * we continue looking for matching messages after finding
+ * one. This matters for subsystems like the internal notify
+ * code which register more than one handler for the same
+ * message type
+ */
+ }
+
+ if (!messaging_append_new_waiters(msg_ctx)) {
+ return;
+ }
+
+ i = 0;
+ while (i < msg_ctx->num_waiters) {
+ struct tevent_req *req;
+ struct messaging_filtered_read_state *state;
+
+ req = msg_ctx->waiters[i];
+ if (req == NULL) {
+ /*
+ * This got cleaned up. In the meantime,
+ * move everything down one. We need
+ * to keep the order of waiters, as
+ * other code may depend on this.
+ */
+ if (i < msg_ctx->num_waiters - 1) {
+ memmove(&msg_ctx->waiters[i],
+ &msg_ctx->waiters[i+1],
+ sizeof(struct tevent_req *) *
+ (msg_ctx->num_waiters - i - 1));
+ }
+ msg_ctx->num_waiters -= 1;
+ continue;
+ }
+
+ state = tevent_req_data(
+ req, struct messaging_filtered_read_state);
+ if (state->filter(rec, state->private_data)) {
+ messaging_filtered_read_done(req, rec);
+ }
+
+ i += 1;
+ }
+}
+
+static int mess_parent_dgm_cleanup(void *private_data);
+static void mess_parent_dgm_cleanup_done(struct tevent_req *req);
+
+bool messaging_parent_dgm_cleanup_init(struct messaging_context *msg)
+{
+ struct tevent_req *req;
+
+ req = background_job_send(
+ msg, msg->event_ctx, msg, NULL, 0,
+ lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
+ 60*15),
+ mess_parent_dgm_cleanup, msg);
+ if (req == NULL) {
+ return false;
+ }
+ tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
+ return true;
+}
+
+static int mess_parent_dgm_cleanup(void *private_data)
+{
+ struct messaging_context *msg_ctx = talloc_get_type_abort(
+ private_data, struct messaging_context);
+ NTSTATUS status;
+
+ status = messaging_dgm_wipe(msg_ctx);
+ DEBUG(10, ("messaging_dgm_wipe returned %s\n", nt_errstr(status)));
+ return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
+ 60*15);
+}
+
+static void mess_parent_dgm_cleanup_done(struct tevent_req *req)
+{
+ struct messaging_context *msg = tevent_req_callback_data(
+ req, struct messaging_context);
+ NTSTATUS status;
+
+ status = background_job_recv(req);
+ TALLOC_FREE(req);
+ DEBUG(1, ("messaging dgm cleanup job ended with %s\n",
+ nt_errstr(status)));
+
+ req = background_job_send(
+ msg, msg->event_ctx, msg, NULL, 0,
+ lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
+ 60*15),
+ mess_parent_dgm_cleanup, msg);
+ if (req == NULL) {
+ DEBUG(1, ("background_job_send failed\n"));
}
- return;
+ tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
+}
+
+struct messaging_backend *messaging_local_backend(
+ struct messaging_context *msg_ctx)
+{
+ return msg_ctx->local;
}
/** @} **/
git.samba.org / samba.git / blobdiff