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/*
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/iov_buf.h"
/*
* It is not possible to include ctdb.h and tdb_compat.h (included via
* some other include above) without warnings. This fixes those
* warnings.
*/
#ifdef typesafe_cb
#undef typesafe_cb
#endif
#ifdef typesafe_cb_preargs
#undef typesafe_cb_preargs
#endif
#ifdef typesafe_cb_postargs
#undef typesafe_cb_postargs
#endif
#include "ctdb.h"
#include "ctdb_private.h"
#include "ctdbd_conn.h"
struct messaging_ctdbd_context {
struct ctdbd_connection *conn;
};
/*
* 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"));
}
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);
struct messaging_rec msg;
uint8_t *buf;
ssize_t buflen;
NTSTATUS status;
if (num_fds > 0) {
return ENOSYS;
}
buflen = iov_buflen(iov, iovlen);
if (buflen == -1) {
return EMSGSIZE;
}
buf = talloc_array(talloc_tos(), uint8_t, buflen);
if (buflen == NULL) {
return ENOMEM;
}
iov_buf(iov, iovlen, buf, buflen);
msg = (struct messaging_rec) {
.msg_version = MESSAGE_VERSION,
.msg_type = msg_type,
.dest = pid,
.src = src,
.buf = data_blob_const(buf, talloc_get_size(buf)),
};
status = ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
TALLOC_FREE(buf);
if (NT_STATUS_IS_OK(status)) {
return 0;
}
return map_errno_from_nt_status(status);
}
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;
}
NTSTATUS 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;
NTSTATUS status;
if (!(result = talloc(mem_ctx, struct messaging_backend))) {
DEBUG(0, ("talloc failed\n"));
return NT_STATUS_NO_MEMORY;
}
if (!(ctx = talloc(result, struct messaging_ctdbd_context))) {
DEBUG(0, ("talloc failed\n"));
TALLOC_FREE(result);
return NT_STATUS_NO_MEMORY;
}
status = ctdbd_messaging_connection(ctx, &ctx->conn);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
nt_errstr(status)));
TALLOC_FREE(result);
return status;
}
status = ctdbd_register_msg_ctx(ctx->conn, msg_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
nt_errstr(status)));
TALLOC_FREE(result);
return status;
}
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 NT_STATUS_OK;
}
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