2 Unix SMB/CIFS implementation.
3 Samba internal messaging functions
4 Copyright (C) 2007 by Volker Lendecke
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "lib/util/server_id.h"
24 #include "lib/util/iov_buf.h"
25 #include "lib/messages_util.h"
26 #include "ctdbd_conn.h"
27 #include "lib/cluster_support.h"
30 struct messaging_ctdbd_context {
31 struct ctdbd_connection *conn;
32 struct tevent_fd *fde;
36 * This is a Samba3 hack/optimization. Routines like process_exists need to
37 * talk to ctdbd, and they don't get handed a messaging context.
39 static struct ctdbd_connection *global_ctdbd_connection;
40 static int global_ctdb_connection_pid;
42 struct ctdbd_connection *messaging_ctdbd_connection(void)
44 if (!lp_clustering()) {
48 if (global_ctdb_connection_pid == 0 &&
49 global_ctdbd_connection == NULL) {
50 struct tevent_context *ev;
51 struct messaging_context *msg;
53 ev = samba_tevent_context_init(NULL);
55 DEBUG(0,("samba_tevent_context_init failed\n"));
59 msg = messaging_init(NULL, ev);
61 DEBUG(0,("messaging_init failed\n"));
66 if (global_ctdb_connection_pid != getpid()) {
67 DEBUG(0,("messaging_ctdbd_connection():"
68 "valid for pid[%jd] but it's [%jd]\n",
69 (intmax_t)global_ctdb_connection_pid,
71 smb_panic("messaging_ctdbd_connection() invalid process\n");
74 return global_ctdbd_connection;
77 static int messaging_ctdb_send(struct server_id src,
78 struct server_id pid, int msg_type,
79 const struct iovec *iov, int iovlen,
80 const int *fds, size_t num_fds,
81 struct messaging_backend *backend)
83 struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
84 backend->private_data, struct messaging_ctdbd_context);
85 uint8_t hdr[MESSAGE_HDR_LENGTH];
86 struct iovec iov2[iovlen+1];
92 message_hdr_put(hdr, msg_type, src, pid);
93 iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
94 memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
96 return ctdbd_messaging_send_iov(ctx->conn, pid.vnn, pid.pid,
100 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
103 * The global connection just went away
105 global_ctdb_connection_pid = 0;
106 global_ctdbd_connection = NULL;
110 static int messaging_ctdb_recv(
111 uint32_t src_vnn, uint32_t dst_vnn, uint64_t dst_srvid,
112 const uint8_t *msg, size_t msg_len, void *private_data)
114 struct messaging_context *msg_ctx = talloc_get_type_abort(
115 private_data, struct messaging_context);
116 struct server_id me = messaging_server_id(msg_ctx);
119 struct server_id src, dst;
120 enum messaging_type msg_type;
121 struct server_id_buf idbuf;
123 if (msg_len < MESSAGE_HDR_LENGTH) {
124 DEBUG(1, ("%s: message too short: %u\n", __func__,
129 message_hdr_get(&msg_type, &src, &dst, msg);
131 iov = (struct iovec) {
132 .iov_base = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH,
133 .iov_len = msg_len - MESSAGE_HDR_LENGTH
136 DEBUG(10, ("%s: Received message 0x%x len %u from %s\n",
137 __func__, (unsigned)msg_type, (unsigned)msg_len,
138 server_id_str_buf(src, &idbuf)));
140 if (!server_id_same_process(&me, &dst)) {
141 struct server_id_buf id1, id2;
143 DEBUG(10, ("%s: I'm %s, ignoring msg to %s\n", __func__,
144 server_id_str_buf(me, &id1),
145 server_id_str_buf(dst, &id2)));
150 * Go through the event loop
153 ret = messaging_send_iov_from(msg_ctx, src, dst, msg_type,
157 DEBUG(10, ("%s: messaging_send_iov_from failed: %s\n",
158 __func__, strerror(ret)));
164 static void messaging_ctdbd_readable(struct tevent_context *ev,
165 struct tevent_fd *fde,
169 struct ctdbd_connection *conn = talloc_get_type_abort(
170 private_data, struct ctdbd_connection);
172 if ((flags & TEVENT_FD_READ) == 0) {
175 ctdbd_socket_readable(conn);
178 static int messaging_ctdbd_init_internal(struct messaging_context *msg_ctx,
180 struct messaging_ctdbd_context *ctx,
183 struct tevent_context *ev;
187 TALLOC_FREE(ctx->fde);
189 ret = ctdbd_reinit_connection(ctx,
194 DBG_ERR("ctdbd_reinit_connection failed: %s\n",
199 ret = ctdbd_init_connection(ctx,
204 DBG_ERR("ctdbd_init_connection failed: %s\n",
210 ret = register_with_ctdbd(ctx->conn, MSG_SRVID_SAMBA, NULL, NULL);
212 DBG_DEBUG("Could not register MSG_SRVID_SAMBA: %s\n",
217 ret = register_with_ctdbd(ctx->conn, getpid(),
218 messaging_ctdb_recv, msg_ctx);
220 DEBUG(10, ("register_with_ctdbd failed: %s\n",
225 ctdb_fd = ctdbd_conn_get_fd(ctx->conn);
226 ev = messaging_tevent_context(msg_ctx);
228 ctx->fde = tevent_add_fd(ev, ctx, ctdb_fd, TEVENT_FD_READ,
229 messaging_ctdbd_readable, ctx->conn);
230 if (ctx->fde == NULL) {
234 global_ctdb_connection_pid = getpid();
235 global_ctdbd_connection = ctx->conn;
236 talloc_set_destructor(ctx, messaging_ctdbd_destructor);
238 set_my_vnn(ctdbd_vnn(ctx->conn));
243 int messaging_ctdbd_init(struct messaging_context *msg_ctx,
245 struct messaging_backend **presult)
247 struct messaging_backend *result;
248 struct messaging_ctdbd_context *ctx;
251 if (!(result = talloc(mem_ctx, struct messaging_backend))) {
252 DEBUG(0, ("talloc failed\n"));
256 if (!(ctx = talloc(result, struct messaging_ctdbd_context))) {
257 DEBUG(0, ("talloc failed\n"));
262 ret = messaging_ctdbd_init_internal(msg_ctx, mem_ctx, ctx, false);
268 result->send_fn = messaging_ctdb_send;
269 result->private_data = (void *)ctx;
275 int messaging_ctdbd_reinit(struct messaging_context *msg_ctx,
277 struct messaging_backend *backend)
279 struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
280 backend->private_data, struct messaging_ctdbd_context);
283 ret = messaging_ctdbd_init_internal(msg_ctx, mem_ctx, ctx, true);