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
|
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013, Digium, Inc.
*
* Joshua Colp <jcolp@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*** MODULEINFO
<depend>pjproject</depend>
<depend>res_pjsip</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <pjsip.h>
#include <sys/time.h>
#include <signal.h>
#include "asterisk/res_pjsip.h"
#include "asterisk/module.h"
#include "asterisk/named_locks.h"
/*! \brief Thread keeping things alive */
static pthread_t check_thread = AST_PTHREADT_NULL;
/*! \brief The global interval at which to check for contact expiration */
static unsigned int check_interval;
/*! \brief Callback function which deletes a contact */
static int expire_contact(void *obj, void *arg, int flags)
{
struct ast_sip_contact *contact = obj;
struct ast_named_lock *lock;
lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_MUTEX, "aor", contact->aor);
if (!lock) {
return 0;
}
/*
* We need to check the expiration again with the aor lock held
* in case another thread is attempting to renew the contact.
*/
ao2_lock(lock);
if (ast_tvdiff_ms(ast_tvnow(), contact->expiration_time) > 0) {
ast_sip_location_delete_contact(contact);
}
ao2_unlock(lock);
ast_named_lock_put(lock);
return 0;
}
static void *check_expiration_thread(void *data)
{
struct ao2_container *contacts;
struct ast_variable *var;
char *time = alloca(64);
while (check_interval) {
sleep(check_interval);
sprintf(time, "%ld", ast_tvnow().tv_sec);
var = ast_variable_new("expiration_time <=", time, "");
ast_debug(4, "Woke up at %s Interval: %d\n", time, check_interval);
contacts = ast_sorcery_retrieve_by_fields(ast_sip_get_sorcery(), "contact",
AST_RETRIEVE_FLAG_MULTIPLE, var);
ast_variables_destroy(var);
if (contacts) {
ast_debug(3, "Expiring %d contacts\n", ao2_container_count(contacts));
ao2_callback(contacts, OBJ_NODATA, expire_contact, NULL);
ao2_ref(contacts, -1);
}
}
return NULL;
}
static void expiration_global_loaded(const char *object_type)
{
check_interval = ast_sip_get_contact_expiration_check_interval();
/* Observer calls are serialized so this is safe without it's own lock */
if (check_interval) {
if (check_thread == AST_PTHREADT_NULL) {
if (ast_pthread_create_background(&check_thread, NULL, check_expiration_thread, NULL)) {
ast_log(LOG_ERROR, "Could not create thread for checking contact expiration.\n");
return;
}
ast_debug(3, "Interval = %d, starting thread\n", check_interval);
}
} else {
if (check_thread != AST_PTHREADT_NULL) {
pthread_kill(check_thread, SIGURG);
pthread_join(check_thread, NULL);
check_thread = AST_PTHREADT_NULL;
ast_debug(3, "Interval = 0, shutting thread down\n");
}
}
}
/*! \brief Observer which is used to update our interval when the global setting changes */
static struct ast_sorcery_observer expiration_global_observer = {
.loaded = expiration_global_loaded,
};
static int unload_module(void)
{
if (check_thread != AST_PTHREADT_NULL) {
check_interval = 0;
pthread_kill(check_thread, SIGURG);
pthread_join(check_thread, NULL);
check_thread = AST_PTHREADT_NULL;
}
ast_sorcery_observer_remove(ast_sip_get_sorcery(), "global", &expiration_global_observer);
return 0;
}
static int load_module(void)
{
CHECK_PJSIP_MODULE_LOADED();
ast_sorcery_observer_add(ast_sip_get_sorcery(), "global", &expiration_global_observer);
ast_sorcery_reload_object(ast_sip_get_sorcery(), "global");
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Contact Auto-Expiration",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND,
);
|
