-
Notifications
You must be signed in to change notification settings - Fork 2.4k
/
loop.c
321 lines (285 loc) · 8.32 KB
/
loop.c
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
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
/*
Copyright (c) 2009-2020 Roger Light <[email protected]>
All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License v1.0
and Eclipse Distribution License v1.0 which accompany this distribution.
The Eclipse Public License is available at
https://www.eclipse.org/legal/epl-v10.html
and the Eclipse Distribution License is available at
https://www.eclipse.org/org/documents/edl-v10.php.
Contributors:
Roger Light - initial implementation and documentation.
Tatsuzo Osawa - Add epoll.
*/
#include "config.h"
#ifndef WIN32
# define _GNU_SOURCE
#endif
#include <assert.h>
#ifndef WIN32
#include <unistd.h>
#else
#include <process.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#ifndef WIN32
# include <sys/socket.h>
#endif
#include <time.h>
#ifdef WITH_WEBSOCKETS
# include <libwebsockets.h>
#endif
#include "mosquitto_broker_internal.h"
#include "memory_mosq.h"
#include "packet_mosq.h"
#include "send_mosq.h"
#include "sys_tree.h"
#include "time_mosq.h"
#include "util_mosq.h"
extern bool flag_reload;
#ifdef WITH_PERSISTENCE
extern bool flag_db_backup;
#endif
extern bool flag_tree_print;
extern int run;
#ifdef WITH_WEBSOCKETS
static void temp__expire_websockets_clients(struct mosquitto_db *db)
{
struct mosquitto *context, *ctxt_tmp;
static time_t last_check = 0;
time_t now = mosquitto_time();
char *id;
if(now - last_check > 60){
HASH_ITER(hh_id, db->contexts_by_id, context, ctxt_tmp){
if(context->wsi && context->sock != INVALID_SOCKET){
if(context->keepalive && now - context->last_msg_in > (time_t)(context->keepalive)*3/2){
if(db->config->connection_messages == true){
if(context->id){
id = context->id;
}else{
id = "<unknown>";
}
if(db->config->connection_messages == true){
log__printf(NULL, MOSQ_LOG_NOTICE, "Client %s has exceeded timeout, disconnecting.", id);
}
}
/* Client has exceeded keepalive*1.5 */
do_disconnect(db, context, MOSQ_ERR_KEEPALIVE);
}
}
}
last_check = mosquitto_time();
}
}
#endif
#if defined(WITH_WEBSOCKETS) && LWS_LIBRARY_VERSION_NUMBER == 3002000
void lws__sul_callback(struct lws_sorted_usec_list *l)
{
}
static struct lws_sorted_usec_list sul;
#endif
int mosquitto_main_loop(struct mosquitto_db *db, mosq_sock_t *listensock, int listensock_count)
{
#ifdef WITH_SYS_TREE
time_t start_time = mosquitto_time();
#endif
#ifdef WITH_PERSISTENCE
time_t last_backup = mosquitto_time();
#endif
time_t now = 0;
int time_count;
struct mosquitto *context, *ctxt_tmp;
#ifdef WITH_BRIDGE
int rc;
#endif
#ifdef WITH_WEBSOCKETS
int i;
#endif
#if defined(WITH_WEBSOCKETS) && LWS_LIBRARY_VERSION_NUMBER == 3002000
memset(&sul, 0, sizeof(struct lws_sorted_usec_list));
#endif
rc = mux__init(db, listensock, listensock_count);
if(rc) return rc;
#ifdef WITH_BRIDGE
rc = bridge__register_local_connections(db);
if(rc) return rc;
#endif
while(run){
context__free_disused(db);
#ifdef WITH_SYS_TREE
if(db->config->sys_interval > 0){
sys_tree__update(db, db->config->sys_interval, start_time);
}
#endif
time_count = 0;
HASH_ITER(hh_sock, db->contexts_by_sock, context, ctxt_tmp){
if(time_count > 0){
time_count--;
}else{
time_count = 1000;
now = mosquitto_time();
}
if(context->sock != INVALID_SOCKET){
/* Local bridges never time out in this fashion. */
if(!(context->keepalive)
|| context->bridge
|| now - context->last_msg_in <= (time_t)(context->keepalive)*3/2){
if(db__message_write(db, context) == MOSQ_ERR_SUCCESS){
if(context->current_out_packet || context->state == mosq_cs_connect_pending || context->ws_want_write){
rc = mux__add_out(db, context);
context->ws_want_write = false;
}
else{
rc = mux__remove_out(db, context);
}
}else{
do_disconnect(db, context, MOSQ_ERR_CONN_LOST);
}
}else{
/* Client has exceeded keepalive*1.5 */
do_disconnect(db, context, MOSQ_ERR_KEEPALIVE);
}
}
}
bridge_check(db);
rc = mux__handle(db, listensock, listensock_count);
if(rc) return rc;
now = time(NULL);
session_expiry__check(db, now);
will_delay__check(db, now);
#ifdef WITH_PERSISTENCE
if(db->config->persistence && db->config->autosave_interval){
if(db->config->autosave_on_changes){
if(db->persistence_changes >= db->config->autosave_interval){
persist__backup(db, false);
db->persistence_changes = 0;
}
}else{
if(last_backup + db->config->autosave_interval < mosquitto_time()){
persist__backup(db, false);
last_backup = mosquitto_time();
}
}
}
#endif
#ifdef WITH_PERSISTENCE
if(flag_db_backup){
persist__backup(db, false);
flag_db_backup = false;
}
#endif
if(flag_reload){
log__printf(NULL, MOSQ_LOG_INFO, "Reloading config.");
config__read(db, db->config, true);
mosquitto_security_cleanup(db, true);
mosquitto_security_init(db, true);
mosquitto_security_apply(db);
log__close(db->config);
log__init(db->config);
flag_reload = false;
}
if(flag_tree_print){
sub__tree_print(db->subs, 0);
flag_tree_print = false;
}
#ifdef WITH_WEBSOCKETS
for(i=0; i<db->config->listener_count; i++){
/* Extremely hacky, should be using the lws provided external poll
* interface, but their interface has changed recently and ours
* will soon, so for now websockets clients are second class
* citizens. */
if(db->config->listeners[i].ws_context){
#if LWS_LIBRARY_VERSION_NUMBER > 3002000
libwebsocket_service(db->config->listeners[i].ws_context, -1);
#elif LWS_LIBRARY_VERSION_NUMBER == 3002000
lws_sul_schedule(db->config->listeners[i].ws_context, 0, &sul, lws__sul_callback, 10);
libwebsocket_service(db->config->listeners[i].ws_context, 0);
#else
libwebsocket_service(db->config->listeners[i].ws_context, 0);
#endif
}
}
if(db->config->have_websockets_listener){
temp__expire_websockets_clients(db);
}
#endif
}
mux__cleanup(db);
return MOSQ_ERR_SUCCESS;
}
void do_disconnect(struct mosquitto_db *db, struct mosquitto *context, int reason)
{
char *id;
#ifdef WITH_WEBSOCKETS
bool is_duplicate = false;
#endif
if(context->state == mosq_cs_disconnected){
return;
}
#ifdef WITH_WEBSOCKETS
if(context->wsi){
if(context->state == mosq_cs_duplicate){
is_duplicate = true;
}
if(context->state != mosq_cs_disconnecting && context->state != mosq_cs_disconnect_with_will){
mosquitto__set_state(context, mosq_cs_disconnect_ws);
}
if(context->wsi){
libwebsocket_callback_on_writable(context->ws_context, context->wsi);
}
if(context->sock != INVALID_SOCKET){
HASH_DELETE(hh_sock, db->contexts_by_sock, context);
mux__delete(db, context);
context->sock = INVALID_SOCKET;
}
if(is_duplicate){
/* This occurs if another client is taking over the same client id.
* It is important to remove this from the by_id hash here, so it
* doesn't leave us with multiple clients in the hash with the same
* id. Websockets doesn't actually close the connection here,
* unlike for normal clients, which means there is extra time when
* there could be two clients with the same id in the hash. */
context__remove_from_by_id(db, context);
}
}else
#endif
{
if(db->config->connection_messages == true){
if(context->id){
id = context->id;
}else{
id = "<unknown>";
}
if(context->state != mosq_cs_disconnecting && context->state != mosq_cs_disconnect_with_will){
switch(reason){
case MOSQ_ERR_SUCCESS:
break;
case MOSQ_ERR_PROTOCOL:
log__printf(NULL, MOSQ_LOG_NOTICE, "Client %s disconnected due to protocol error.", id);
break;
case MOSQ_ERR_CONN_LOST:
log__printf(NULL, MOSQ_LOG_NOTICE, "Client %s closed its connection.", id);
break;
case MOSQ_ERR_AUTH:
log__printf(NULL, MOSQ_LOG_NOTICE, "Client %s disconnected, no longer authorised.", id);
break;
case MOSQ_ERR_KEEPALIVE:
log__printf(NULL, MOSQ_LOG_NOTICE, "Client %s has exceeded timeout, disconnecting.", id);
break;
default:
log__printf(NULL, MOSQ_LOG_NOTICE, "Socket error on client %s, disconnecting.", id);
break;
}
}else{
log__printf(NULL, MOSQ_LOG_NOTICE, "Client %s disconnected.", id);
}
}
mux__delete(db, context);
context__disconnect(db, context);
}
}