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samba-mirror/source3/lib/messages_ctdbd.c
Volker Lendecke 069d79bbd9 lib: Move async message handling out of ctdbd_conn
messages_ctdbd.c is the code that is genuinely interested in
async messages from ctdb, so let it take care of them.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
2016-05-17 13:18:31 +02:00

246 lines
6.2 KiB
C

/*
Unix SMB/CIFS implementation.
Samba internal messaging functions
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/>.
*/
#include "includes.h"
#include "messages.h"
#include "util_tdb.h"
#include "lib/util/iov_buf.h"
#include "lib/messages_util.h"
#include "ctdbd_conn.h"
#include "lib/cluster_support.h"
struct messaging_ctdbd_context {
struct ctdbd_connection *conn;
struct tevent_fd *fde;
};
/*
* This is a Samba3 hack/optimization. Routines like process_exists need to
* talk to ctdbd, and they don't get handed a messaging context.
*/
static struct ctdbd_connection *global_ctdbd_connection;
static int global_ctdb_connection_pid;
struct ctdbd_connection *messaging_ctdbd_connection(void)
{
if (!lp_clustering()) {
return NULL;
}
if (global_ctdb_connection_pid == 0 &&
global_ctdbd_connection == NULL) {
struct tevent_context *ev;
struct messaging_context *msg;
ev = samba_tevent_context_init(NULL);
if (!ev) {
DEBUG(0,("samba_tevent_context_init failed\n"));
return NULL;
}
msg = messaging_init(NULL, ev);
if (!msg) {
DEBUG(0,("messaging_init failed\n"));
return NULL;
}
}
if (global_ctdb_connection_pid != getpid()) {
DEBUG(0,("messaging_ctdbd_connection():"
"valid for pid[%jd] but it's [%jd]\n",
(intmax_t)global_ctdb_connection_pid,
(intmax_t)getpid()));
smb_panic("messaging_ctdbd_connection() invalid process\n");
}
return global_ctdbd_connection;
}
static int messaging_ctdb_send(struct server_id src,
struct server_id pid, int msg_type,
const struct iovec *iov, int iovlen,
const int *fds, size_t num_fds,
struct messaging_backend *backend)
{
struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
backend->private_data, struct messaging_ctdbd_context);
uint8_t hdr[MESSAGE_HDR_LENGTH];
struct iovec iov2[iovlen+1];
if (num_fds > 0) {
return ENOSYS;
}
message_hdr_put(hdr, msg_type, src, pid);
iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
return ctdbd_messaging_send_iov(ctx->conn, pid.vnn, pid.pid,
iov2, iovlen+1);
}
static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
{
/*
* The global connection just went away
*/
global_ctdb_connection_pid = 0;
global_ctdbd_connection = NULL;
return 0;
}
static int messaging_ctdb_recv(
uint32_t src_vnn, uint32_t dst_vnn, uint64_t dst_srvid,
const uint8_t *msg, size_t msg_len, void *private_data)
{
struct messaging_context *msg_ctx = talloc_get_type_abort(
private_data, struct messaging_context);
struct server_id me = messaging_server_id(msg_ctx);
int ret;
struct iovec iov;
struct server_id src, dst;
enum messaging_type msg_type;
struct server_id_buf idbuf;
if (msg_len < MESSAGE_HDR_LENGTH) {
DEBUG(1, ("%s: message too short: %u\n", __func__,
(unsigned)msg_len));
return 0;
}
message_hdr_get(&msg_type, &src, &dst, msg);
iov = (struct iovec) {
.iov_base = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH,
.iov_len = msg_len - MESSAGE_HDR_LENGTH
};
DEBUG(10, ("%s: Received message 0x%x len %u from %s\n",
__func__, (unsigned)msg_type, (unsigned)msg_len,
server_id_str_buf(src, &idbuf)));
if (!server_id_same_process(&me, &dst)) {
struct server_id_buf id1, id2;
DEBUG(10, ("%s: I'm %s, ignoring msg to %s\n", __func__,
server_id_str_buf(me, &id1),
server_id_str_buf(dst, &id2)));
return 0;
}
/*
* Go through the event loop
*/
ret = messaging_send_iov_from(msg_ctx, src, dst, msg_type,
&iov, 1, NULL, 0);
if (ret != 0) {
DEBUG(10, ("%s: messaging_send_iov_from failed: %s\n",
__func__, strerror(ret)));
}
return 0;
}
static void messaging_ctdbd_readable(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags,
void *private_data)
{
struct ctdbd_connection *conn = talloc_get_type_abort(
private_data, struct ctdbd_connection);
if ((flags & TEVENT_FD_READ) == 0) {
return;
}
ctdbd_socket_readable(conn);
}
int messaging_ctdbd_init(struct messaging_context *msg_ctx,
TALLOC_CTX *mem_ctx,
struct messaging_backend **presult)
{
struct messaging_backend *result;
struct messaging_ctdbd_context *ctx;
struct tevent_context *ev;
int ret, ctdb_fd;
if (!(result = talloc(mem_ctx, struct messaging_backend))) {
DEBUG(0, ("talloc failed\n"));
return ENOMEM;
}
if (!(ctx = talloc(result, struct messaging_ctdbd_context))) {
DEBUG(0, ("talloc failed\n"));
TALLOC_FREE(result);
return ENOMEM;
}
ret = ctdbd_init_connection(ctx, lp_ctdbd_socket(),
lp_ctdb_timeout(), &ctx->conn);
if (ret != 0) {
DBG_DEBUG("ctdbd_init_connection failed: %s\n",
strerror(ret));
TALLOC_FREE(result);
return ret;
}
ret = register_with_ctdbd(ctx->conn, MSG_SRVID_SAMBA, NULL, NULL);
if (ret != 0) {
DBG_DEBUG("Could not register MSG_SRVID_SAMBA: %s\n",
strerror(ret));
TALLOC_FREE(result);
return ret;
}
ret = register_with_ctdbd(ctx->conn, getpid(),
messaging_ctdb_recv, msg_ctx);
if (ret != 0) {
DEBUG(10, ("register_with_ctdbd failed: %s\n",
strerror(ret)));
TALLOC_FREE(result);
return ret;
}
ctdb_fd = ctdbd_conn_get_fd(ctx->conn);
ev = messaging_tevent_context(msg_ctx);
ctx->fde = tevent_add_fd(ev, ctx, ctdb_fd, TEVENT_FD_READ,
messaging_ctdbd_readable, ctx->conn);
if (ctx->fde == NULL) {
TALLOC_FREE(result);
return ENOMEM;
}
global_ctdb_connection_pid = getpid();
global_ctdbd_connection = ctx->conn;
talloc_set_destructor(ctx, messaging_ctdbd_destructor);
set_my_vnn(ctdbd_vnn(ctx->conn));
result->send_fn = messaging_ctdb_send;
result->private_data = (void *)ctx;
*presult = result;
return 0;
}