*/
#include "includes.h"
+#include "lib/util/server_id.h"
#include "dbwrap/dbwrap.h"
#include "serverid.h"
#include "messages.h"
#include "lib/util/tevent_unix.h"
#include "lib/background.h"
+#include "lib/messages_dgm.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;
- uint32 msg_type;
+ uint32_t msg_type;
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_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;
- struct messaging_backend *local;
- struct messaging_backend *remote;
+ void *msg_dgm_ref;
+ void *msg_ctdb_ref;
- bool *have_context;
+ struct server_id_db *names_db;
};
-static int messaging_context_destructor(struct messaging_context *msg_ctx);
+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);
/****************************************************************************
A useful function for testing the message system.
messaging_send(msg_ctx, src, MSG_PONG, data);
}
-/****************************************************************************
- Register/replace a dispatch function for a particular message type.
- JRA changed Dec 13 2006. Only one message handler now permitted per type.
- *NOTE*: Dispatch functions must be able to cope with incoming
- messages on an *odd* byte boundary.
-****************************************************************************/
+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;
-struct msg_all {
- struct messaging_context *msg_ctx;
- int msg_type;
- uint32 msg_flag;
- const void *buf;
- size_t len;
- int n_sent;
-};
+ if (num_fds > INT8_MAX) {
+ return NULL;
+ }
-/****************************************************************************
- Send one of the messages for the broadcast.
-****************************************************************************/
+ 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 int traverse_fn(struct db_record *rec, const struct server_id *id,
- uint32_t msg_flags, void *state)
+static bool messaging_register_event_context(struct messaging_context *ctx,
+ struct tevent_context *ev)
{
- struct msg_all *msg_all = (struct msg_all *)state;
- NTSTATUS status;
+ size_t i, num_event_contexts;
+ struct messaging_registered_ev *free_reg = NULL;
+ struct messaging_registered_ev *tmp;
- /* Don't send if the receiver hasn't registered an interest. */
+ num_event_contexts = talloc_array_length(ctx->event_contexts);
- if((msg_flags & msg_all->msg_flag) == 0) {
- return 0;
+ for (i=0; i<num_event_contexts; i++) {
+ struct messaging_registered_ev *reg = &ctx->event_contexts[i];
+
+ if (reg->refcount == 0) {
+ if (reg->ev != NULL) {
+ abort();
+ }
+ free_reg = reg;
+ /*
+ * We continue here and may find another
+ * free_req, but the important thing is
+ * that we continue to search for an
+ * existing registration in the loop.
+ */
+ continue;
+ }
+
+ if (reg->ev == ev) {
+ reg->refcount += 1;
+ return true;
+ }
+ }
+
+ if (free_reg == NULL) {
+ struct tevent_immediate *im = NULL;
+
+ im = tevent_create_immediate(ctx);
+ if (im == NULL) {
+ return false;
+ }
+
+ 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->im = talloc_move(ctx->event_contexts, &im);
}
- /* If the msg send fails because the pid was not found (i.e. smbd died),
- * the msg has already been deleted from the messages.tdb.*/
+ /*
+ * free_reg->im might be cached
+ */
+ free_reg->ev = ev;
+ free_reg->refcount = 1;
+
+ return true;
+}
- status = messaging_send_buf(msg_all->msg_ctx, *id, msg_all->msg_type,
- (const uint8_t *)msg_all->buf, msg_all->len);
+static bool messaging_deregister_event_context(struct messaging_context *ctx,
+ struct tevent_context *ev)
+{
+ size_t i, num_event_contexts;
- if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
- struct server_id_buf idbuf;
+ num_event_contexts = talloc_array_length(ctx->event_contexts);
- /*
- * If the pid was not found delete the entry from
- * serverid.tdb
- */
+ for (i=0; i<num_event_contexts; i++) {
+ struct messaging_registered_ev *reg = &ctx->event_contexts[i];
- DEBUG(2, ("pid %s doesn't exist\n",
- server_id_str_buf(*id, &idbuf)));
+ if (reg->refcount == 0) {
+ continue;
+ }
- dbwrap_record_delete(rec);
+ if (reg->ev == ev) {
+ reg->refcount -= 1;
+
+ if (reg->refcount == 0) {
+ /*
+ * The primary event context
+ * is never unregistered using
+ * messaging_deregister_event_context()
+ * it's only registered using
+ * messaging_register_event_context().
+ */
+ SMB_ASSERT(ev != ctx->event_ctx);
+ SMB_ASSERT(reg->ev != ctx->event_ctx);
+
+ /*
+ * Not strictly necessary, just
+ * paranoia
+ */
+ reg->ev = NULL;
+
+ /*
+ * Do not talloc_free(reg->im),
+ * recycle immediates events.
+ *
+ * We just invalidate it using
+ * the primary event context,
+ * which is never unregistered.
+ */
+ tevent_schedule_immediate(reg->im,
+ ctx->event_ctx,
+ NULL, NULL);
+ }
+ return true;
+ }
}
- msg_all->n_sent++;
- return 0;
+ return false;
}
-/**
- * Send a message to all smbd processes.
- *
- * It isn't very efficient, but should be OK for the sorts of
- * applications that use it. When we need efficient broadcast we can add
- * it.
- *
- * @param n_sent Set to the number of messages sent. This should be
- * equal to the number of processes, but be careful for races.
- *
- * @retval True for success.
- **/
-bool message_send_all(struct messaging_context *msg_ctx,
- int msg_type,
- const void *buf, size_t len,
- int *n_sent)
-{
- struct msg_all msg_all;
-
- msg_all.msg_type = msg_type;
- if (msg_type < 0x100) {
- msg_all.msg_flag = FLAG_MSG_GENERAL;
- } else if (msg_type > 0x100 && msg_type < 0x200) {
- msg_all.msg_flag = FLAG_MSG_NMBD;
- } else if (msg_type > 0x200 && msg_type < 0x300) {
- msg_all.msg_flag = FLAG_MSG_PRINT_GENERAL;
- } else if (msg_type > 0x300 && msg_type < 0x400) {
- msg_all.msg_flag = FLAG_MSG_SMBD;
- } 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;
+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);
+ }
+ }
+}
- msg_all.buf = buf;
- msg_all.len = len;
- msg_all.n_sent = 0;
- msg_all.msg_ctx = msg_ctx;
+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;
+ }
+
+ /*
+ * 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.
+ *
+ * reg->ev and ctx->event_ctx can't
+ * be wrapper tevent_context pointers
+ * so we don't need to use
+ * tevent_context_same_loop().
+ */
+
+ 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);
+ }
- serverid_traverse(traverse_fn, &msg_all);
- if (n_sent)
- *n_sent = msg_all.n_sent;
+ }
return true;
}
-static void messaging_recv_cb(int msg_type,
- struct server_id src, struct server_id dst,
+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)
{
struct messaging_context *msg_ctx = talloc_get_type_abort(
private_data, struct messaging_context);
+ struct server_id_buf idbuf;
struct messaging_rec rec;
+ int64_t fds64[MIN(num_fds, INT8_MAX)];
+ size_t i;
+
+ if (msg_len < MESSAGE_HDR_LENGTH) {
+ DBG_WARNING("message too short: %zu\n", msg_len);
+ goto close_fail;
+ }
+
+ if (num_fds > INT8_MAX) {
+ DBG_WARNING("too many fds: %zu\n", num_fds);
+ goto close_fail;
+ }
+
+ /*
+ * "consume" the fds by copying them and setting
+ * the original variable to -1
+ */
+ for (i=0; i < num_fds; i++) {
+ fds64[i] = fds[i];
+ fds[i] = -1;
+ }
rec = (struct messaging_rec) {
.msg_version = MESSAGE_VERSION,
- .msg_type = msg_type,
- .src = src,
- .dest = dst,
- .buf.data = discard_const_p(uint8, msg),
- .buf.length = msg_len
+ .buf.data = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH,
+ .buf.length = msg_len - MESSAGE_HDR_LENGTH,
+ .num_fds = num_fds,
+ .fds = fds64,
};
- messaging_dispatch_rec(msg_ctx, &rec);
+ message_hdr_get(&rec.msg_type, &rec.src, &rec.dest, msg);
+
+ DBG_DEBUG("Received message 0x%x len %zu (num_fds:%zu) from %s\n",
+ (unsigned)rec.msg_type, rec.buf.length, num_fds,
+ server_id_str_buf(rec.src, &idbuf));
+
+ if (server_id_same_process(&rec.src, &msg_ctx->id)) {
+ DBG_DEBUG("Ignoring self-send\n");
+ goto close_fail;
+ }
+
+ messaging_dispatch_rec(msg_ctx, ev, &rec);
+ return;
+
+close_fail:
+ for (i=0; i < num_fds; i++) {
+ close(fds[i]);
+ }
}
-struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
- struct tevent_context *ev)
+static int messaging_context_destructor(struct messaging_context *ctx)
+{
+ size_t i;
+
+ for (i=0; i<ctx->num_new_waiters; i++) {
+ if (ctx->new_waiters[i] != NULL) {
+ tevent_req_set_cleanup_fn(ctx->new_waiters[i], NULL);
+ ctx->new_waiters[i] = NULL;
+ }
+ }
+ for (i=0; i<ctx->num_waiters; i++) {
+ if (ctx->waiters[i] != NULL) {
+ tevent_req_set_cleanup_fn(ctx->waiters[i], NULL);
+ ctx->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;
+}
+
+static const char *private_path(const char *name)
{
+ return talloc_asprintf(talloc_tos(), "%s/%s", lp_private_dir(), name);
+}
+
+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;
+ NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
int ret;
- static bool have_context = false;
+ const char *lck_path;
+ const char *priv_path;
+ bool ok;
- if (have_context) {
- DEBUG(0, ("No two messaging contexts per process\n"));
- return NULL;
+ /*
+ * sec_init() *must* be called before any other
+ * functions that use sec_XXX(). e.g. sec_initial_uid().
+ */
+
+ sec_init();
+
+ if (tevent_context_is_wrapper(ev)) {
+ /* This is really a programmer error! */
+ DBG_ERR("Should not be used with a wrapper tevent context\n");
+ return NT_STATUS_INVALID_PARAMETER;
}
+ lck_path = lock_path(talloc_tos(), "msg.lock");
+ if (lck_path == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
- if (!(ctx = talloc_zero(mem_ctx, struct messaging_context))) {
- return NULL;
+ ok = directory_create_or_exist_strict(lck_path,
+ sec_initial_uid(),
+ 0755);
+ if (!ok) {
+ 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) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ ok = directory_create_or_exist_strict(priv_path, sec_initial_uid(),
+ 0700);
+ if (!ok) {
+ 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->id = procid_self();
+ ctx->id = (struct server_id) {
+ .pid = getpid(), .vnn = NONCLUSTER_VNN
+ };
+
ctx->event_ctx = ev;
- ctx->have_context = &have_context;
- ret = messaging_dgm_init(ctx, ctx->event_ctx, ctx->id,
- &ctx->local, messaging_recv_cb, ctx);
+ ok = messaging_register_event_context(ctx, ev);
+ if (!ok) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
- if (ret != 0) {
- DEBUG(2, ("messaging_dgm_init failed: %s\n", strerror(ret)));
- TALLOC_FREE(ctx);
- return NULL;
+ 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)));
+ status = map_nt_error_from_unix(ret);
+ goto done;
}
+ talloc_set_destructor(ctx, messaging_context_destructor);
+#ifdef CLUSTER_SUPPORT
if (lp_clustering()) {
- status = messaging_ctdbd_init(ctx, ctx, &ctx->remote);
-
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(2, ("messaging_ctdbd_init failed: %s\n",
- nt_errstr(status)));
- 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);
+ if (ctx->names_db == NULL) {
+ DBG_DEBUG("server_id_db_init failed\n");
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
+
messaging_register(ctx, NULL, MSG_PING, ping_message);
/* Register some debugging related messages */
register_dmalloc_msgs(ctx);
debug_register_msgs(ctx);
- have_context = true;
- talloc_set_destructor(ctx, messaging_context_destructor);
+ {
+ struct server_id_buf tmp;
+ DBG_DEBUG("my id: %s\n", server_id_str_buf(ctx->id, &tmp));
+ }
- return ctx;
+ *pmsg_ctx = talloc_steal(mem_ctx, ctx);
+
+ status = NT_STATUS_OK;
+done:
+ TALLOC_FREE(frame);
+
+ return status;
}
-static int messaging_context_destructor(struct messaging_context *msg_ctx)
+struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev)
{
- SMB_ASSERT(*msg_ctx->have_context);
- *msg_ctx->have_context = false;
- return 0;
+ 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;
}
struct server_id messaging_server_id(const struct messaging_context *msg_ctx)
*/
NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
{
- NTSTATUS status;
int ret;
+ char *lck_path;
- TALLOC_FREE(msg_ctx->local);
+ TALLOC_FREE(msg_ctx->msg_dgm_ref);
+ TALLOC_FREE(msg_ctx->msg_ctdb_ref);
- msg_ctx->id = procid_self();
+ msg_ctx->id = (struct server_id) {
+ .pid = getpid(), .vnn = msg_ctx->id.vnn
+ };
- ret = messaging_dgm_init(msg_ctx, msg_ctx->event_ctx,
- msg_ctx->id, &msg_ctx->local,
- messaging_recv_cb, msg_ctx);
- if (ret != 0) {
- DEBUG(0, ("messaging_dgm_init failed: %s\n", strerror(errno)));
- return map_nt_error_from_unix(ret);
+ lck_path = lock_path(talloc_tos(), "msg.lock");
+ if (lck_path == NULL) {
+ return NT_STATUS_NO_MEMORY;
}
- TALLOC_FREE(msg_ctx->remote);
+ msg_ctx->msg_dgm_ref = messaging_dgm_ref(
+ msg_ctx, msg_ctx->event_ctx, &msg_ctx->id.unique_id,
+ private_path("msg.sock"), lck_path,
+ messaging_recv_cb, msg_ctx, &ret);
- if (lp_clustering()) {
- status = messaging_ctdbd_init(msg_ctx, msg_ctx,
- &msg_ctx->remote);
+ if (msg_ctx->msg_dgm_ref == NULL) {
+ DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
+ return map_nt_error_from_unix(ret);
+ }
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("messaging_ctdbd_init failed: %s\n",
- nt_errstr(status)));
- return status;
+ if (lp_clustering()) {
+ 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);
}
}
+ server_id_db_reinit(msg_ctx->names_db, msg_ctx->id);
+
return NT_STATUS_OK;
}
}
}
-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)
{
- struct iovec iov;
+ struct iovec iov = {0};
- iov.iov_base = data->data;
- iov.iov_len = data->length;
+ if (data != NULL) {
+ iov.iov_base = data->data;
+ iov.iov_len = data->length;
+ };
- return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1);
+ return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1, NULL, 0);
}
NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
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)
+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,
+ const struct iovec *iov, int iovlen,
+ const int *fds, size_t num_fds)
{
int ret;
+ uint8_t hdr[MESSAGE_HDR_LENGTH];
+ struct iovec iov2[iovlen+1];
- if (server_id_is_disconnected(&server)) {
- return NT_STATUS_INVALID_PARAMETER_MIX;
+ if (server_id_is_disconnected(&dst)) {
+ return EINVAL;
}
- if (!procid_is_local(&server)) {
- ret = msg_ctx->remote->send_fn(msg_ctx->id, server,
- msg_type, iov, iovlen,
- msg_ctx->remote);
- if (ret != 0) {
- return map_nt_error_from_unix(ret);
- }
- return NT_STATUS_OK;
+ if (num_fds > INT8_MAX) {
+ return EINVAL;
}
- if (messaging_is_self_send(msg_ctx, &server)) {
- struct messaging_rec rec;
- uint8_t *buf;
+ 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));
- buf = iov_buf(talloc_tos(), iov, iovlen);
- if (buf == NULL) {
- return NT_STATUS_NO_MEMORY;
+ if (dst.vnn != msg_ctx->id.vnn) {
+ if (num_fds > 0) {
+ return ENOSYS;
}
- rec.msg_version = MESSAGE_VERSION;
- rec.msg_type = msg_type & MSG_TYPE_MASK;
- rec.dest = server;
- rec.src = msg_ctx->id;
- rec.buf = data_blob_const(buf, talloc_get_size(buf));
- messaging_dispatch_rec(msg_ctx, &rec);
- TALLOC_FREE(buf);
- return NT_STATUS_OK;
+ ret = messaging_ctdb_send(dst.vnn, dst.pid, iov2, iovlen+1);
+ return ret;
+ }
+
+ ret = messaging_dgm_send(dst.pid, iov2, iovlen+1, fds, num_fds);
+
+ if (ret == EACCES) {
+ become_root();
+ ret = messaging_dgm_send(dst.pid, iov2, iovlen+1,
+ fds, num_fds);
+ 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;
}
- ret = msg_ctx->local->send_fn(msg_ctx->id, server, msg_type,
- iov, iovlen, msg_ctx->local);
+ return ret;
+}
+
+NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
+ struct server_id dst, uint32_t msg_type,
+ const struct iovec *iov, int iovlen,
+ const int *fds, size_t num_fds)
+{
+ int ret;
+
+ ret = messaging_send_iov_from(msg_ctx, msg_ctx->id, dst, msg_type,
+ iov, iovlen, fds, num_fds);
if (ret != 0) {
return map_nt_error_from_unix(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,
- 1, rec->buf.length);
+ result = talloc_pooled_object(mem_ctx, struct messaging_rec, 2,
+ payload_len);
if (result == NULL) {
return NULL;
}
result->buf.data = talloc_memdup(result, rec->buf.data,
rec->buf.length);
+
+ result->fds = NULL;
+ if (result->num_fds > 0) {
+ result->fds = talloc_memdup(result, rec->fds, fds_size);
+ }
+
return result;
}
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);
state->filter = filter;
state->private_data = private_data;
+ if (tevent_context_is_wrapper(ev)) {
+ /* This is really a programmer error! */
+ DBG_ERR("Wrapper tevent context doesn't use main context.\n");
+ tevent_req_error(req, EINVAL);
+ return tevent_req_post(req, ev);
+ }
+
/*
* 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)) {
+ 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
tevent_req_received(req);
return err;
}
- *presult = talloc_move(mem_ctx, &state->rec);
+ if (presult != NULL) {
+ *presult = talloc_move(mem_ctx, &state->rec);
+ }
return 0;
}
struct messaging_read_state *state = talloc_get_type_abort(
private_data, struct messaging_read_state);
+ if (rec->num_fds != 0) {
+ return false;
+ }
+
return rec->msg_type == state->msg_type;
}
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
-*/
-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;
for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
+ size_t j;
+
next = cb->next;
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
+ * the old style callbacks don't support fd passing
*/
+ for (j=0; j < rec->num_fds; j++) {
+ int fd = rec->fds[j];
+ close(fd);
+ }
+ rec->num_fds = 0;
+ rec->fds = NULL;
+
+ cb->fn(msg_ctx, cb->private_data, rec->msg_type,
+ rec->src, &rec->buf);
+
+ 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)) {
- 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);
+ 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;
+
+ /*
+ * ev and msg_ctx->event_ctx can't be wrapper tevent_context pointers
+ * so we don't need to use tevent_context_same_loop().
+ */
+
+ 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 (i=0; i < rec->num_fds; i++) {
+ int fd = rec->fds[i];
+ close(fd);
+ }
+ rec->num_fds = 0;
+ rec->fds = NULL;
}
static int mess_parent_dgm_cleanup(void *private_data);
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);
static int mess_parent_dgm_cleanup(void *private_data)
{
- struct messaging_context *msg_ctx = talloc_get_type_abort(
- private_data, struct messaging_context);
int ret;
- ret = messaging_dgm_wipe(msg_ctx);
+ ret = messaging_dgm_wipe();
DEBUG(10, ("messaging_dgm_wipe returned %s\n",
ret ? strerror(ret) : "ok"));
return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
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)
+int messaging_cleanup(struct messaging_context *msg_ctx, pid_t pid)
{
- return msg_ctx->local;
+ int ret;
+
+ if (pid == 0) {
+ ret = messaging_dgm_wipe();
+ } else {
+ ret = messaging_dgm_cleanup(pid);
+ }
+
+ return ret;
}
struct tevent_context *messaging_tevent_context(
return msg_ctx->event_ctx;
}
+struct server_id_db *messaging_names_db(struct messaging_context *msg_ctx)
+{
+ return msg_ctx->names_db;
+}
+
/** @} **/
git.samba.org / samba.git / blobdiff