*/
#include "includes.h"
+#include "lib/util/server_id.h"
#include "dbwrap/dbwrap.h"
#include "serverid.h"
#include "messages.h"
#include "lib/util/iov_buf.h"
#include "lib/util/server_id_db.h"
#include "lib/messages_dgm_ref.h"
+#include "lib/messages_ctdb.h"
+#include "lib/messages_ctdb_ref.h"
#include "lib/messages_util.h"
+#include "cluster_support.h"
+#include "ctdbd_conn.h"
+#include "ctdb_srvids.h"
+
+#ifdef CLUSTER_SUPPORT
+#include "ctdb_protocol.h"
+#endif
struct messaging_callback {
struct messaging_callback *prev, *next;
void *private_data;
};
+struct messaging_registered_ev {
+ struct tevent_context *ev;
+ struct tevent_immediate *im;
+ size_t refcount;
+};
+
struct messaging_context {
struct server_id id;
struct tevent_context *event_ctx;
struct messaging_callback *callbacks;
+ struct messaging_rec *posted_msgs;
+
+ struct messaging_registered_ev *event_contexts;
+
struct tevent_req **new_waiters;
- unsigned num_new_waiters;
+ size_t num_new_waiters;
struct tevent_req **waiters;
- unsigned num_waiters;
+ size_t num_waiters;
void *msg_dgm_ref;
- struct messaging_backend *remote;
+ void *msg_ctdb_ref;
struct server_id_db *names_db;
};
+static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
+ struct messaging_rec *rec);
+static bool messaging_dispatch_classic(struct messaging_context *msg_ctx,
+ struct messaging_rec *rec);
+static bool messaging_dispatch_waiters(struct messaging_context *msg_ctx,
+ struct tevent_context *ev,
+ struct messaging_rec *rec);
static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
+ struct tevent_context *ev,
struct messaging_rec *rec);
/****************************************************************************
messaging_send(msg_ctx, src, MSG_PONG, data);
}
-static void messaging_recv_cb(const uint8_t *msg, size_t msg_len,
+struct messaging_rec *messaging_rec_create(
+ TALLOC_CTX *mem_ctx, struct server_id src, struct server_id dst,
+ uint32_t msg_type, const struct iovec *iov, int iovlen,
+ const int *fds, size_t num_fds)
+{
+ ssize_t buflen;
+ uint8_t *buf;
+ struct messaging_rec *result;
+
+ if (num_fds > INT8_MAX) {
+ return NULL;
+ }
+
+ buflen = iov_buflen(iov, iovlen);
+ if (buflen == -1) {
+ return NULL;
+ }
+ buf = talloc_array(mem_ctx, uint8_t, buflen);
+ if (buf == NULL) {
+ return NULL;
+ }
+ iov_buf(iov, iovlen, buf, buflen);
+
+ {
+ struct messaging_rec rec;
+ int64_t fds64[num_fds];
+ size_t i;
+
+ for (i=0; i<num_fds; i++) {
+ fds64[i] = fds[i];
+ }
+
+ rec = (struct messaging_rec) {
+ .msg_version = MESSAGE_VERSION, .msg_type = msg_type,
+ .src = src, .dest = dst,
+ .buf.data = buf, .buf.length = buflen,
+ .num_fds = num_fds, .fds = fds64,
+ };
+
+ result = messaging_rec_dup(mem_ctx, &rec);
+ }
+
+ TALLOC_FREE(buf);
+
+ return result;
+}
+
+static bool messaging_register_event_context(struct messaging_context *ctx,
+ struct tevent_context *ev)
+{
+ size_t i, num_event_contexts;
+ struct messaging_registered_ev *free_reg = NULL;
+ struct messaging_registered_ev *tmp;
+
+ num_event_contexts = talloc_array_length(ctx->event_contexts);
+
+ for (i=0; i<num_event_contexts; i++) {
+ struct messaging_registered_ev *reg = &ctx->event_contexts[i];
+
+ if (reg->ev == ev) {
+ reg->refcount += 1;
+ return true;
+ }
+ if (reg->refcount == 0) {
+ if (reg->ev != NULL) {
+ abort();
+ }
+ free_reg = reg;
+ }
+ }
+
+ if (free_reg == NULL) {
+ tmp = talloc_realloc(ctx, ctx->event_contexts,
+ struct messaging_registered_ev,
+ num_event_contexts+1);
+ if (tmp == NULL) {
+ return false;
+ }
+ ctx->event_contexts = tmp;
+
+ free_reg = &ctx->event_contexts[num_event_contexts];
+ }
+
+ *free_reg = (struct messaging_registered_ev) { .ev = ev, .refcount = 1 };
+
+ return true;
+}
+
+static bool messaging_deregister_event_context(struct messaging_context *ctx,
+ struct tevent_context *ev)
+{
+ size_t i, num_event_contexts;
+
+ num_event_contexts = talloc_array_length(ctx->event_contexts);
+
+ for (i=0; i<num_event_contexts; i++) {
+ struct messaging_registered_ev *reg = &ctx->event_contexts[i];
+
+ if (reg->ev == ev) {
+ if (reg->refcount == 0) {
+ return false;
+ }
+ reg->refcount -= 1;
+
+ if (reg->refcount == 0) {
+ /*
+ * Not strictly necessary, just
+ * paranoia
+ */
+ reg->ev = NULL;
+
+ /*
+ * Do not talloc_free(reg->im),
+ * recycle immediates events.
+ */
+ }
+ return true;
+ }
+ }
+ return false;
+}
+
+static void messaging_post_main_event_context(struct tevent_context *ev,
+ struct tevent_immediate *im,
+ void *private_data)
+{
+ struct messaging_context *ctx = talloc_get_type_abort(
+ private_data, struct messaging_context);
+
+ while (ctx->posted_msgs != NULL) {
+ struct messaging_rec *rec = ctx->posted_msgs;
+ bool consumed;
+
+ DLIST_REMOVE(ctx->posted_msgs, rec);
+
+ consumed = messaging_dispatch_classic(ctx, rec);
+ if (!consumed) {
+ consumed = messaging_dispatch_waiters(
+ ctx, ctx->event_ctx, rec);
+ }
+
+ if (!consumed) {
+ uint8_t i;
+
+ for (i=0; i<rec->num_fds; i++) {
+ close(rec->fds[i]);
+ }
+ }
+
+ TALLOC_FREE(rec);
+ }
+}
+
+static void messaging_post_sub_event_context(struct tevent_context *ev,
+ struct tevent_immediate *im,
+ void *private_data)
+{
+ struct messaging_context *ctx = talloc_get_type_abort(
+ private_data, struct messaging_context);
+ struct messaging_rec *rec, *next;
+
+ for (rec = ctx->posted_msgs; rec != NULL; rec = next) {
+ bool consumed;
+
+ next = rec->next;
+
+ consumed = messaging_dispatch_waiters(ctx, ev, rec);
+ if (consumed) {
+ DLIST_REMOVE(ctx->posted_msgs, rec);
+ TALLOC_FREE(rec);
+ }
+ }
+}
+
+static bool messaging_alert_event_contexts(struct messaging_context *ctx)
+{
+ size_t i, num_event_contexts;
+
+ num_event_contexts = talloc_array_length(ctx->event_contexts);
+
+ for (i=0; i<num_event_contexts; i++) {
+ struct messaging_registered_ev *reg = &ctx->event_contexts[i];
+
+ if (reg->refcount == 0) {
+ continue;
+ }
+
+ if (reg->im == NULL) {
+ reg->im = tevent_create_immediate(
+ ctx->event_contexts);
+ }
+ if (reg->im == NULL) {
+ DBG_WARNING("Could not create immediate\n");
+ continue;
+ }
+
+ /*
+ * We depend on schedule_immediate to work
+ * multiple times. Might be a bit inefficient,
+ * but this needs to be proven in tests. The
+ * alternatively would be to track whether the
+ * immediate has already been scheduled. For
+ * now, avoid that complexity here.
+ */
+
+ if (reg->ev == ctx->event_ctx) {
+ tevent_schedule_immediate(
+ reg->im, reg->ev,
+ messaging_post_main_event_context,
+ ctx);
+ } else {
+ tevent_schedule_immediate(
+ reg->im, reg->ev,
+ messaging_post_sub_event_context,
+ ctx);
+ }
+
+ }
+ return true;
+}
+
+static void messaging_recv_cb(struct tevent_context *ev,
+ const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds,
void *private_data)
{
(unsigned)rec.msg_type, rec.buf.length, num_fds,
server_id_str_buf(rec.src, &idbuf));
- messaging_dispatch_rec(msg_ctx, &rec);
+ messaging_dispatch_rec(msg_ctx, ev, &rec);
return;
close_fail:
static int messaging_context_destructor(struct messaging_context *ctx)
{
- unsigned i;
+ size_t i;
for (i=0; i<ctx->num_new_waiters; i++) {
if (ctx->new_waiters[i] != NULL) {
}
}
+ /*
+ * The immediates from messaging_alert_event_contexts
+ * reference "ctx". Don't let them outlive the
+ * messaging_context we're destroying here.
+ */
+ TALLOC_FREE(ctx->event_contexts);
+
return 0;
}
return talloc_asprintf(talloc_tos(), "%s/%s", lp_private_dir(), name);
}
-struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
- struct tevent_context *ev)
+static NTSTATUS messaging_init_internal(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct messaging_context **pmsg_ctx)
{
+ TALLOC_CTX *frame;
struct messaging_context *ctx;
+ NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
int ret;
const char *lck_path;
const char *priv_path;
bool ok;
- if (!(ctx = talloc_zero(mem_ctx, struct messaging_context))) {
- return NULL;
- }
-
- ctx->id = (struct server_id) {
- .pid = getpid(), .vnn = NONCLUSTER_VNN
- };
-
- ctx->event_ctx = ev;
-
- sec_init();
-
lck_path = lock_path("msg.lock");
if (lck_path == NULL) {
- TALLOC_FREE(ctx);
- return NULL;
+ return NT_STATUS_NO_MEMORY;
}
- ok = directory_create_or_exist_strict(lck_path, sec_initial_uid(),
+ ok = directory_create_or_exist_strict(lck_path,
+ sec_initial_uid(),
0755);
if (!ok) {
- DEBUG(10, ("%s: Could not create lock directory: %s\n",
- __func__, strerror(errno)));
- TALLOC_FREE(ctx);
- return NULL;
+ DBG_DEBUG("Could not create lock directory: %s\n",
+ strerror(errno));
+ return NT_STATUS_ACCESS_DENIED;
}
priv_path = private_path("msg.sock");
if (priv_path == NULL) {
- TALLOC_FREE(ctx);
- return NULL;
+ return NT_STATUS_NO_MEMORY;
}
ok = directory_create_or_exist_strict(priv_path, sec_initial_uid(),
0700);
if (!ok) {
- DEBUG(10, ("%s: Could not create msg directory: %s\n",
- __func__, strerror(errno)));
- TALLOC_FREE(ctx);
- return NULL;
+ DBG_DEBUG("Could not create msg directory: %s\n",
+ strerror(errno));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ frame = talloc_stackframe();
+ if (frame == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ ctx = talloc_zero(frame, struct messaging_context);
+ if (ctx == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
}
- ctx->msg_dgm_ref = messaging_dgm_ref(
- ctx, ctx->event_ctx, &ctx->id.unique_id,
- priv_path, lck_path, messaging_recv_cb, ctx, &ret);
+ ctx->id = (struct server_id) {
+ .pid = getpid(), .vnn = NONCLUSTER_VNN
+ };
+
+ ctx->event_ctx = ev;
+
+ ok = messaging_register_event_context(ctx, ev);
+ if (!ok) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
+
+ sec_init();
+ ctx->msg_dgm_ref = messaging_dgm_ref(ctx,
+ ctx->event_ctx,
+ &ctx->id.unique_id,
+ priv_path,
+ lck_path,
+ messaging_recv_cb,
+ ctx,
+ &ret);
if (ctx->msg_dgm_ref == NULL) {
DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
- TALLOC_FREE(ctx);
- return NULL;
+ status = map_nt_error_from_unix(ret);
+ goto done;
}
-
talloc_set_destructor(ctx, messaging_context_destructor);
+#ifdef CLUSTER_SUPPORT
if (lp_clustering()) {
- ret = messaging_ctdbd_init(ctx, ctx, &ctx->remote);
-
- if (ret != 0) {
- DEBUG(2, ("messaging_ctdbd_init failed: %s\n",
- strerror(ret)));
- TALLOC_FREE(ctx);
- return NULL;
+ ctx->msg_ctdb_ref = messaging_ctdb_ref(
+ ctx, ctx->event_ctx,
+ lp_ctdbd_socket(), lp_ctdb_timeout(),
+ ctx->id.unique_id, messaging_recv_cb, ctx, &ret);
+ if (ctx->msg_ctdb_ref == NULL) {
+ DBG_NOTICE("messaging_ctdb_ref failed: %s\n",
+ strerror(ret));
+ status = map_nt_error_from_unix(ret);
+ goto done;
}
}
+#endif
+
ctx->id.vnn = get_my_vnn();
- ctx->names_db = server_id_db_init(
- ctx, ctx->id, lp_lock_directory(), 0,
- TDB_INCOMPATIBLE_HASH|TDB_CLEAR_IF_FIRST);
+ ctx->names_db = server_id_db_init(ctx,
+ ctx->id,
+ lp_lock_directory(),
+ 0,
+ TDB_INCOMPATIBLE_HASH|TDB_CLEAR_IF_FIRST);
if (ctx->names_db == NULL) {
- DEBUG(10, ("%s: server_id_db_init failed\n", __func__));
- TALLOC_FREE(ctx);
- return NULL;
+ DBG_DEBUG("server_id_db_init failed\n");
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
}
messaging_register(ctx, NULL, MSG_PING, ping_message);
DBG_DEBUG("my id: %s\n", server_id_str_buf(ctx->id, &tmp));
}
+ *pmsg_ctx = talloc_steal(mem_ctx, ctx);
+
+ status = NT_STATUS_OK;
+done:
+ TALLOC_FREE(frame);
+
+ return status;
+}
+
+struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev)
+{
+ struct messaging_context *ctx = NULL;
+ NTSTATUS status;
+
+ status = messaging_init_internal(mem_ctx,
+ ev,
+ &ctx);
+ if (!NT_STATUS_IS_OK(status)) {
+ return NULL;
+ }
+
return ctx;
}
+NTSTATUS messaging_init_client(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct messaging_context **pmsg_ctx)
+{
+ return messaging_init_internal(mem_ctx,
+ ev,
+ pmsg_ctx);
+}
+
struct server_id messaging_server_id(const struct messaging_context *msg_ctx)
{
return msg_ctx->id;
char *lck_path;
TALLOC_FREE(msg_ctx->msg_dgm_ref);
+ TALLOC_FREE(msg_ctx->msg_ctdb_ref);
msg_ctx->id = (struct server_id) {
.pid = getpid(), .vnn = msg_ctx->id.vnn
}
if (lp_clustering()) {
- ret = messaging_ctdbd_reinit(msg_ctx, msg_ctx,
- msg_ctx->remote);
-
- if (ret != 0) {
- DEBUG(1, ("messaging_ctdbd_init failed: %s\n",
- strerror(ret)));
+ msg_ctx->msg_ctdb_ref = messaging_ctdb_ref(
+ msg_ctx, msg_ctx->event_ctx,
+ lp_ctdbd_socket(), lp_ctdb_timeout(),
+ msg_ctx->id.unique_id, messaging_recv_cb, msg_ctx,
+ &ret);
+ if (msg_ctx->msg_ctdb_ref == NULL) {
+ DBG_NOTICE("messaging_ctdb_ref failed: %s\n",
+ strerror(ret));
return map_nt_error_from_unix(ret);
}
}
return messaging_send(msg_ctx, server, msg_type, &blob);
}
+static int messaging_post_self(struct messaging_context *msg_ctx,
+ struct server_id src, struct server_id dst,
+ uint32_t msg_type,
+ const struct iovec *iov, int iovlen,
+ const int *fds, size_t num_fds)
+{
+ struct messaging_rec *rec;
+ bool ok;
+
+ rec = messaging_rec_create(
+ msg_ctx, src, dst, msg_type, iov, iovlen, fds, num_fds);
+ if (rec == NULL) {
+ return ENOMEM;
+ }
+
+ ok = messaging_alert_event_contexts(msg_ctx);
+ if (!ok) {
+ TALLOC_FREE(rec);
+ return ENOMEM;
+ }
+
+ DLIST_ADD_END(msg_ctx->posted_msgs, rec);
+
+ return 0;
+}
+
int messaging_send_iov_from(struct messaging_context *msg_ctx,
struct server_id src, struct server_id dst,
uint32_t msg_type,
return EINVAL;
}
+ if (server_id_equal(&dst, &msg_ctx->id)) {
+ ret = messaging_post_self(msg_ctx, src, dst, msg_type,
+ iov, iovlen, fds, num_fds);
+ return ret;
+ }
+
+ message_hdr_put(hdr, msg_type, src, dst);
+ iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
+ memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
+
if (dst.vnn != msg_ctx->id.vnn) {
if (num_fds > 0) {
return ENOSYS;
}
- ret = msg_ctx->remote->send_fn(src, dst,
- msg_type, iov, iovlen,
- NULL, 0,
- msg_ctx->remote);
+ ret = messaging_ctdb_send(dst.vnn, dst.pid, iov2, iovlen+1);
return ret;
}
- message_hdr_put(hdr, msg_type, src, dst);
- iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
- memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
-
ret = messaging_dgm_send(dst.pid, iov2, iovlen+1, fds, num_fds);
if (ret == EACCES) {
unbecome_root();
}
+ if (ret == ECONNREFUSED) {
+ /*
+ * Linux returns this when a socket exists in the file
+ * system without a listening process. This is not
+ * documented in susv4 or the linux manpages, but it's
+ * easily testable. For the higher levels this is the
+ * same as "destination does not exist"
+ */
+ ret = ENOENT;
+ }
+
return ret;
}
return NT_STATUS_OK;
}
+struct send_all_state {
+ struct messaging_context *msg_ctx;
+ int msg_type;
+ const void *buf;
+ size_t len;
+};
+
+static int send_all_fn(pid_t pid, void *private_data)
+{
+ struct send_all_state *state = private_data;
+ NTSTATUS status;
+
+ if (pid == getpid()) {
+ DBG_DEBUG("Skip ourselves in messaging_send_all\n");
+ return 0;
+ }
+
+ status = messaging_send_buf(state->msg_ctx, pid_to_procid(pid),
+ state->msg_type, state->buf, state->len);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_WARNING("messaging_send_buf to %ju failed: %s\n",
+ (uintmax_t)pid, nt_errstr(status));
+ }
+
+ return 0;
+}
+
+void messaging_send_all(struct messaging_context *msg_ctx,
+ int msg_type, const void *buf, size_t len)
+{
+ struct send_all_state state = {
+ .msg_ctx = msg_ctx, .msg_type = msg_type,
+ .buf = buf, .len = len
+ };
+ int ret;
+
+#ifdef CLUSTER_SUPPORT
+ if (lp_clustering()) {
+ struct ctdbd_connection *conn = messaging_ctdb_connection();
+ uint8_t msghdr[MESSAGE_HDR_LENGTH];
+ struct iovec iov[] = {
+ { .iov_base = msghdr,
+ .iov_len = sizeof(msghdr) },
+ { .iov_base = discard_const_p(void, buf),
+ .iov_len = len }
+ };
+
+ message_hdr_put(msghdr, msg_type, messaging_server_id(msg_ctx),
+ (struct server_id) {0});
+
+ ret = ctdbd_messaging_send_iov(
+ conn, CTDB_BROADCAST_CONNECTED,
+ CTDB_SRVID_SAMBA_PROCESS,
+ iov, ARRAY_SIZE(iov));
+ if (ret != 0) {
+ DBG_WARNING("ctdbd_messaging_send_iov failed: %s\n",
+ strerror(ret));
+ }
+
+ return;
+ }
+#endif
+
+ ret = messaging_dgm_forall(send_all_fn, &state);
+ if (ret != 0) {
+ DBG_WARNING("messaging_dgm_forall failed: %s\n",
+ strerror(ret));
+ }
+}
+
static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
struct messaging_rec *rec)
{
struct messaging_rec *result;
size_t fds_size = sizeof(int64_t) * rec->num_fds;
+ size_t payload_len;
+
+ payload_len = rec->buf.length + fds_size;
+ if (payload_len < rec->buf.length) {
+ /* overflow */
+ return NULL;
+ }
result = talloc_pooled_object(mem_ctx, struct messaging_rec, 2,
- rec->buf.length + fds_size);
+ payload_len);
if (result == NULL) {
return NULL;
}
struct messaging_filtered_read_state {
struct tevent_context *ev;
struct messaging_context *msg_ctx;
- void *tevent_handle;
+ struct messaging_dgm_fde *fde;
+ struct messaging_ctdb_fde *cluster_fde;
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;
+ bool ok;
req = tevent_req_create(mem_ctx, &state,
struct messaging_filtered_read_state);
*/
tevent_req_defer_callback(req, state->ev);
- state->tevent_handle = messaging_dgm_register_tevent_context(
- state, ev);
- if (tevent_req_nomem(state->tevent_handle, req)) {
+ state->fde = messaging_dgm_register_tevent_context(state, ev);
+ if (tevent_req_nomem(state->fde, req)) {
return tevent_req_post(req, ev);
}
+ if (lp_clustering()) {
+ state->cluster_fde =
+ messaging_ctdb_register_tevent_context(state, ev);
+ if (tevent_req_nomem(state->cluster_fde, 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,
msg_ctx->num_new_waiters += 1;
tevent_req_set_cleanup_fn(req, messaging_filtered_read_cleanup);
+ ok = messaging_register_event_context(msg_ctx, ev);
+ if (!ok) {
+ tevent_req_oom(req);
+ return tevent_req_post(req, ev);
+ }
+
return req;
}
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;
+ size_t i;
+ bool ok;
tevent_req_set_cleanup_fn(req, NULL);
- TALLOC_FREE(state->tevent_handle);
+ TALLOC_FREE(state->fde);
+ TALLOC_FREE(state->cluster_fde);
+
+ ok = messaging_deregister_event_context(msg_ctx, state->ev);
+ if (!ok) {
+ abort();
+ }
/*
* Just set the [new_]waiters entry to NULL, be careful not to mess
return 0;
}
-struct messaging_handler_state {
- struct tevent_context *ev;
- struct messaging_context *msg_ctx;
- uint32_t msg_type;
- bool (*handler)(struct messaging_context *msg_ctx,
- struct messaging_rec **rec, void *private_data);
- void *private_data;
-};
-
-static void messaging_handler_got_msg(struct tevent_req *subreq);
-
-struct tevent_req *messaging_handler_send(
- TALLOC_CTX *mem_ctx, struct tevent_context *ev,
- struct messaging_context *msg_ctx, uint32_t msg_type,
- bool (*handler)(struct messaging_context *msg_ctx,
- struct messaging_rec **rec, void *private_data),
- void *private_data)
-{
- struct tevent_req *req, *subreq;
- struct messaging_handler_state *state;
-
- req = tevent_req_create(mem_ctx, &state,
- struct messaging_handler_state);
- if (req == NULL) {
- return NULL;
- }
- state->ev = ev;
- state->msg_ctx = msg_ctx;
- state->msg_type = msg_type;
- state->handler = handler;
- state->private_data = private_data;
-
- subreq = messaging_read_send(state, state->ev, state->msg_ctx,
- state->msg_type);
- if (tevent_req_nomem(subreq, req)) {
- return tevent_req_post(req, ev);
- }
- tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
- return req;
-}
-
-static void messaging_handler_got_msg(struct tevent_req *subreq)
-{
- struct tevent_req *req = tevent_req_callback_data(
- subreq, struct tevent_req);
- struct messaging_handler_state *state = tevent_req_data(
- req, struct messaging_handler_state);
- struct messaging_rec *rec;
- int ret;
- bool ok;
-
- ret = messaging_read_recv(subreq, state, &rec);
- TALLOC_FREE(subreq);
- if (tevent_req_error(req, ret)) {
- return;
- }
-
- subreq = messaging_read_send(state, state->ev, state->msg_ctx,
- state->msg_type);
- if (tevent_req_nomem(subreq, req)) {
- return;
- }
- tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
-
- ok = state->handler(state->msg_ctx, &rec, state->private_data);
- TALLOC_FREE(rec);
- if (ok) {
- /*
- * Next round
- */
- return;
- }
- TALLOC_FREE(subreq);
- tevent_req_done(req);
-}
-
-int messaging_handler_recv(struct tevent_req *req)
-{
- return tevent_req_simple_recv_unix(req);
-}
-
static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
{
if (msg_ctx->num_new_waiters == 0) {
return true;
}
-/*
- Dispatch one messaging_rec
-*/
-static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
- struct messaging_rec *rec)
+static bool messaging_dispatch_classic(struct messaging_context *msg_ctx,
+ struct messaging_rec *rec)
{
struct messaging_callback *cb, *next;
- unsigned i;
- size_t j;
for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
+ size_t j;
+
next = cb->next;
if (cb->msg_type != rec->msg_type) {
continue;
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
- */
+ return true;
}
+ return false;
+}
+
+static bool messaging_dispatch_waiters(struct messaging_context *msg_ctx,
+ struct tevent_context *ev,
+ struct messaging_rec *rec)
+{
+ size_t i;
+
if (!messaging_append_new_waiters(msg_ctx)) {
- for (j=0; j < rec->num_fds; j++) {
- int fd = rec->fds[j];
- close(fd);
- }
- rec->num_fds = 0;
- rec->fds = NULL;
- return;
+ return false;
}
i = 0;
state = tevent_req_data(
req, struct messaging_filtered_read_state);
- if (state->filter(rec, state->private_data)) {
+ if ((ev == state->ev) &&
+ state->filter(rec, state->private_data)) {
messaging_filtered_read_done(req, rec);
-
- /*
- * Only the first one gets the fd-array
- */
- rec->num_fds = 0;
- rec->fds = NULL;
+ return true;
}
i += 1;
}
+ return false;
+}
+
+/*
+ Dispatch one messaging_rec
+*/
+static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
+ struct tevent_context *ev,
+ struct messaging_rec *rec)
+{
+ bool consumed;
+ size_t i;
+
+ if (ev == msg_ctx->event_ctx) {
+ consumed = messaging_dispatch_classic(msg_ctx, rec);
+ if (consumed) {
+ return;
+ }
+ }
+
+ consumed = messaging_dispatch_waiters(msg_ctx, ev, rec);
+ if (consumed) {
+ return;
+ }
+
+ if (ev != msg_ctx->event_ctx) {
+ struct iovec iov;
+ int fds[rec->num_fds];
+ int ret;
+
+ /*
+ * We've been listening on a nested event
+ * context. Messages need to be handled in the main
+ * event context, so post to ourselves
+ */
+
+ iov.iov_base = rec->buf.data;
+ iov.iov_len = rec->buf.length;
+
+ for (i=0; i<rec->num_fds; i++) {
+ fds[i] = rec->fds[i];
+ }
+
+ ret = messaging_post_self(
+ msg_ctx, rec->src, rec->dest, rec->msg_type,
+ &iov, 1, fds, rec->num_fds);
+ if (ret == 0) {
+ return;
+ }
+ }
+
/*
* If the fd-array isn't used, just close it.
*/
- for (j=0; j < rec->num_fds; j++) {
- int fd = rec->fds[j];
+ for (i=0; i < rec->num_fds; i++) {
+ int fd = rec->fds[i];
close(fd);
}
rec->num_fds = 0;
60*15),
mess_parent_dgm_cleanup, msg);
if (req == NULL) {
+ DBG_WARNING("background_job_send failed\n");
return false;
}
tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);