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
|
/*
* Unix SMB/CIFS implementation.
* Samba internal messaging functions
* Copyright (C) 2014 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 "replace.h"
#include <talloc.h>
#include "messages_dgm.h"
#include "messages_dgm_ref.h"
#include "lib/util/debug.h"
#include "lib/util/dlinklist.h"
struct msg_dgm_ref {
struct msg_dgm_ref *prev, *next;
struct messaging_dgm_fde *fde;
void (*recv_cb)(struct tevent_context *ev,
const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data);
void *recv_cb_private_data;
};
static pid_t dgm_pid = 0;
static struct msg_dgm_ref *refs = NULL;
static struct msg_dgm_ref *next_ref = NULL;
static int msg_dgm_ref_destructor(struct msg_dgm_ref *r);
static void msg_dgm_ref_recv(struct tevent_context *ev,
const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data);
void *messaging_dgm_ref(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
uint64_t *unique,
const char *socket_dir,
const char *lockfile_dir,
void (*recv_cb)(struct tevent_context *ev,
const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds,
void *private_data),
void *recv_cb_private_data,
int *err)
{
struct msg_dgm_ref *result, *tmp_refs;
result = talloc(mem_ctx, struct msg_dgm_ref);
if (result == NULL) {
*err = ENOMEM;
return NULL;
}
result->fde = NULL;
tmp_refs = refs;
if ((refs != NULL) && (dgm_pid != getpid())) {
/*
* Have to reinit after fork
*/
messaging_dgm_destroy();
refs = NULL;
}
if (refs == NULL) {
int ret;
ret = messaging_dgm_init(ev, unique, socket_dir, lockfile_dir,
msg_dgm_ref_recv, NULL);
DBG_DEBUG("messaging_dgm_init returned %s\n", strerror(ret));
if (ret != 0) {
DEBUG(10, ("messaging_dgm_init failed: %s\n",
strerror(ret)));
TALLOC_FREE(result);
*err = ret;
return NULL;
}
dgm_pid = getpid();
} else {
int ret;
ret = messaging_dgm_get_unique(getpid(), unique);
DBG_DEBUG("messaging_dgm_get_unique returned %s\n",
strerror(ret));
if (ret != 0) {
TALLOC_FREE(result);
*err = ret;
return NULL;
}
}
result->fde = messaging_dgm_register_tevent_context(result, ev);
if (result->fde == NULL) {
TALLOC_FREE(result);
*err = ENOMEM;
return NULL;
}
DBG_DEBUG("unique = %"PRIu64"\n", *unique);
refs = tmp_refs;
result->recv_cb = recv_cb;
result->recv_cb_private_data = recv_cb_private_data;
DLIST_ADD(refs, result);
talloc_set_destructor(result, msg_dgm_ref_destructor);
return result;
}
static void msg_dgm_ref_recv(struct tevent_context *ev,
const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data)
{
struct msg_dgm_ref *r;
/*
* We have to broadcast incoming messages to all refs. The first ref
* that grabs the fd's will get them.
*/
for (r = refs; r != NULL; r = next_ref) {
bool active;
next_ref = r->next;
active = messaging_dgm_fde_active(r->fde);
if (!active) {
/*
* r's tevent_context has died.
*/
continue;
}
r->recv_cb(ev, msg, msg_len, fds, num_fds,
r->recv_cb_private_data);
}
}
static int msg_dgm_ref_destructor(struct msg_dgm_ref *r)
{
if (refs == NULL) {
abort();
}
if (r == next_ref) {
next_ref = r->next;
}
DLIST_REMOVE(refs, r);
TALLOC_FREE(r->fde);
DBG_DEBUG("refs=%p\n", refs);
if (refs == NULL) {
messaging_dgm_destroy();
}
return 0;
}
|
