1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
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;
};
/*
* 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);
NTSTATUS status;
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
*/
status = messaging_send_iov_from(msg_ctx, src, dst, msg_type,
&iov, 1, NULL, 0);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("%s: messaging_send_iov_from failed: %s\n",
__func__, nt_errstr(status)));
}
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;
int ret;
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;
}
ret = ctdbd_messaging_connection(ctx, lp_ctdbd_socket(),
lp_ctdb_timeout(), &ctx->conn);
if (ret != 0) {
DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
strerror(ret)));
TALLOC_FREE(result);
return map_nt_error_from_unix(ret);
}
ret = ctdbd_register_msg_ctx(ctx->conn, msg_ctx,
messaging_tevent_context(msg_ctx));
if (ret != 0) {
DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
strerror(ret)));
TALLOC_FREE(result);
return map_nt_error_from_unix(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 map_nt_error_from_unix(ret);
}
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;
}
|
