2014-10-17 13:17:58 +00:00
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2014, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_pjsip</depend>
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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2016-04-18 18:41:34 +00:00
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#include <signal.h>
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2014-10-17 13:17:58 +00:00
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#include <pjsip.h>
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#include <pjsip_ua.h>
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#include "asterisk/res_pjsip.h"
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#include "asterisk/module.h"
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#include "asterisk/astobj2.h"
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/*! \brief Number of buckets for keepalive transports */
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2016-03-08 18:12:16 +00:00
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#define TRANSPORTS_BUCKETS 53
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#define IDLE_TIMEOUT (pjsip_cfg()->tsx.td)
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2014-10-17 13:17:58 +00:00
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/*! \brief The keep alive packet to send */
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static const pj_str_t keepalive_packet = { "\r\n\r\n", 4 };
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/*! \brief Global container of active transports */
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2016-05-18 22:37:27 +00:00
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static AO2_GLOBAL_OBJ_STATIC(monitored_transports);
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2014-10-17 13:17:58 +00:00
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2016-03-08 18:12:16 +00:00
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/*! \brief Scheduler context for timing out connections with no data received */
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static struct ast_sched_context *sched;
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2014-10-17 13:17:58 +00:00
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/*! \brief Thread keeping things alive */
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static pthread_t keepalive_thread = AST_PTHREADT_NULL;
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/*! \brief The global interval at which to send keepalives */
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static unsigned int keepalive_interval;
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/*! \brief Existing transport manager callback that we need to invoke */
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static pjsip_tp_state_callback tpmgr_state_callback;
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2016-03-08 18:12:16 +00:00
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/*! \brief Structure for transport to be monitored */
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struct monitored_transport {
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2014-10-17 13:17:58 +00:00
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/*! \brief The underlying PJSIP transport */
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pjsip_transport *transport;
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2016-03-08 18:12:16 +00:00
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/*! \brief Non-zero if a PJSIP request was received */
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int sip_received;
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2014-10-17 13:17:58 +00:00
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};
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/*! \brief Callback function to send keepalive */
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static int keepalive_transport_cb(void *obj, void *arg, int flags)
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{
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2016-03-08 18:12:16 +00:00
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struct monitored_transport *monitored = obj;
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2014-10-17 13:17:58 +00:00
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pjsip_tpselector selector = {
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.type = PJSIP_TPSELECTOR_TRANSPORT,
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2016-03-08 18:12:16 +00:00
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.u.transport = monitored->transport,
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2014-10-17 13:17:58 +00:00
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};
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pjsip_tpmgr_send_raw(pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint()),
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2016-03-08 18:12:16 +00:00
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monitored->transport->key.type, &selector, NULL, keepalive_packet.ptr, keepalive_packet.slen,
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&monitored->transport->key.rem_addr, pj_sockaddr_get_len(&monitored->transport->key.rem_addr),
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2014-10-17 13:17:58 +00:00
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NULL, NULL);
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return 0;
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}
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/*! \brief Thread which sends keepalives to all active connection-oriented transports */
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static void *keepalive_transport_thread(void *data)
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{
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2016-05-18 22:37:27 +00:00
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struct ao2_container *transports;
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2014-10-17 13:17:58 +00:00
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pj_thread_desc desc;
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pj_thread_t *thread;
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if (pj_thread_register("Asterisk Keepalive Thread", desc, &thread) != PJ_SUCCESS) {
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ast_log(LOG_ERROR, "Could not register keepalive thread with PJLIB, keepalives will not occur.\n");
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return NULL;
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}
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2016-05-18 22:37:27 +00:00
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transports = ao2_global_obj_ref(monitored_transports);
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if (!transports) {
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return NULL;
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}
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2014-10-17 13:17:58 +00:00
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/* Once loaded this module just keeps on going as it is unsafe to stop and change the underlying
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* callback for the transport manager.
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*/
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2016-04-18 18:41:34 +00:00
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while (keepalive_interval) {
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2014-10-17 13:17:58 +00:00
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sleep(keepalive_interval);
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ao2_callback(transports, OBJ_NODATA, keepalive_transport_cb, NULL);
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}
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2016-05-18 22:37:27 +00:00
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ao2_ref(transports, -1);
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2014-10-17 13:17:58 +00:00
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return NULL;
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}
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2016-04-14 18:49:35 +00:00
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AST_THREADSTORAGE(desc_storage);
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2016-03-08 18:12:16 +00:00
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static int idle_sched_cb(const void *data)
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{
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struct monitored_transport *keepalive = (struct monitored_transport *) data;
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2016-04-14 18:49:35 +00:00
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if (!pj_thread_is_registered()) {
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pj_thread_t *thread;
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pj_thread_desc *desc;
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desc = ast_threadstorage_get(&desc_storage, sizeof(pj_thread_desc));
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if (!desc) {
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ast_log(LOG_ERROR, "Could not get thread desc from thread-local storage.\n");
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ao2_ref(keepalive, -1);
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return 0;
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}
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pj_bzero(*desc, sizeof(*desc));
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pj_thread_register("Transport Monitor", *desc, &thread);
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}
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2016-05-18 22:37:27 +00:00
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if (!keepalive->sip_received) {
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2016-03-08 18:12:16 +00:00
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ast_log(LOG_NOTICE, "Shutting down transport '%s' since no request was received in %d seconds\n",
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2016-09-14 14:51:53 +00:00
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keepalive->transport->info, IDLE_TIMEOUT / 1000);
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2016-03-08 18:12:16 +00:00
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pjsip_transport_shutdown(keepalive->transport);
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}
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ao2_ref(keepalive, -1);
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return 0;
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}
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2014-10-17 13:17:58 +00:00
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/*! \brief Destructor for keepalive transport */
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2016-03-08 18:12:16 +00:00
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static void monitored_transport_destroy(void *obj)
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2014-10-17 13:17:58 +00:00
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{
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2016-03-08 18:12:16 +00:00
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struct monitored_transport *keepalive = obj;
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2014-10-17 13:17:58 +00:00
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pjsip_transport_dec_ref(keepalive->transport);
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}
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/*! \brief Callback invoked when transport changes occur */
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2016-03-08 18:12:16 +00:00
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static void monitored_transport_state_callback(pjsip_transport *transport, pjsip_transport_state state,
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2014-10-17 13:17:58 +00:00
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const pjsip_transport_state_info *info)
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{
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2016-05-18 22:37:27 +00:00
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struct ao2_container *transports;
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2016-03-08 18:12:16 +00:00
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/* We only care about reliable transports */
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2016-05-18 22:37:27 +00:00
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if (PJSIP_TRANSPORT_IS_RELIABLE(transport)
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&& (transport->dir == PJSIP_TP_DIR_INCOMING || keepalive_interval)
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&& (transports = ao2_global_obj_ref(monitored_transports))) {
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2016-03-08 18:12:16 +00:00
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struct monitored_transport *monitored;
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2014-10-17 13:17:58 +00:00
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switch (state) {
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case PJSIP_TP_STATE_CONNECTED:
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2016-05-18 22:37:27 +00:00
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monitored = ao2_alloc_options(sizeof(*monitored),
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monitored_transport_destroy, AO2_ALLOC_OPT_LOCK_NOLOCK);
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2016-03-08 18:12:16 +00:00
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if (!monitored) {
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break;
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}
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monitored->transport = transport;
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pjsip_transport_add_ref(monitored->transport);
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2016-05-18 22:37:27 +00:00
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2016-03-08 18:12:16 +00:00
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ao2_link(transports, monitored);
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2016-05-18 22:37:27 +00:00
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2016-03-08 18:12:16 +00:00
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if (transport->dir == PJSIP_TP_DIR_INCOMING) {
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/* Let the scheduler inherit the reference from allocation */
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if (ast_sched_add_variable(sched, IDLE_TIMEOUT, idle_sched_cb, monitored, 1) < 0) {
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2016-05-18 22:37:27 +00:00
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/* Uh Oh. Could not schedule the idle check. Kill the transport. */
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2016-03-08 18:12:16 +00:00
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ao2_unlink(transports, monitored);
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ao2_ref(monitored, -1);
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pjsip_transport_shutdown(transport);
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}
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} else {
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/* No scheduled task, so get rid of the allocation reference */
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ao2_ref(monitored, -1);
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2014-10-17 13:17:58 +00:00
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}
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break;
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2016-03-08 18:12:16 +00:00
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case PJSIP_TP_STATE_SHUTDOWN:
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2014-10-17 13:17:58 +00:00
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case PJSIP_TP_STATE_DISCONNECTED:
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ao2_find(transports, transport->obj_name, OBJ_SEARCH_KEY | OBJ_NODATA | OBJ_UNLINK);
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break;
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default:
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break;
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}
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2016-05-18 22:37:27 +00:00
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ao2_ref(transports, -1);
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2014-10-17 13:17:58 +00:00
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}
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/* Forward to the old state callback if present */
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if (tpmgr_state_callback) {
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tpmgr_state_callback(transport, state, info);
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}
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}
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2016-03-08 18:12:16 +00:00
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/*! \brief Hashing function for monitored transport */
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static int monitored_transport_hash_fn(const void *obj, int flags)
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2014-10-17 13:17:58 +00:00
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{
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2016-03-08 18:12:16 +00:00
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const struct monitored_transport *object;
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2014-10-17 13:17:58 +00:00
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const char *key;
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switch (flags & OBJ_SEARCH_MASK) {
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case OBJ_SEARCH_KEY:
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key = obj;
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break;
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case OBJ_SEARCH_OBJECT:
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object = obj;
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key = object->transport->obj_name;
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break;
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default:
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/* Hash can only work on something with a full key. */
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ast_assert(0);
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return 0;
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}
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return ast_str_hash(key);
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}
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2016-03-08 18:12:16 +00:00
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/*! \brief Comparison function for monitored transport */
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static int monitored_transport_cmp_fn(void *obj, void *arg, int flags)
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2014-10-17 13:17:58 +00:00
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{
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2016-03-08 18:12:16 +00:00
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const struct monitored_transport *object_left = obj;
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const struct monitored_transport *object_right = arg;
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2014-10-17 13:17:58 +00:00
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const char *right_key = arg;
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int cmp;
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switch (flags & OBJ_SEARCH_MASK) {
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case OBJ_SEARCH_OBJECT:
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right_key = object_right->transport->obj_name;
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/* Fall through */
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case OBJ_SEARCH_KEY:
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cmp = strcmp(object_left->transport->obj_name, right_key);
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break;
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case OBJ_SEARCH_PARTIAL_KEY:
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/*
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* We could also use a partial key struct containing a length
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* so strlen() does not get called for every comparison instead.
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*/
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cmp = strncmp(object_left->transport->obj_name, right_key, strlen(right_key));
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break;
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default:
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/*
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* What arg points to is specific to this traversal callback
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* and has no special meaning to astobj2.
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*/
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cmp = 0;
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break;
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}
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2016-05-18 22:37:27 +00:00
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return !cmp ? CMP_MATCH : 0;
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2014-10-17 13:17:58 +00:00
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}
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static void keepalive_global_loaded(const char *object_type)
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{
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unsigned int new_interval = ast_sip_get_keep_alive_interval();
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if (new_interval) {
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keepalive_interval = new_interval;
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} else if (keepalive_interval) {
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ast_log(LOG_NOTICE, "Keepalive support can not be disabled once activated.\n");
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return;
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} else {
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/* This will occur if no keepalive interval has been specified at initial start */
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return;
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}
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if (keepalive_thread != AST_PTHREADT_NULL) {
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return;
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}
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if (ast_pthread_create(&keepalive_thread, NULL, keepalive_transport_thread, NULL)) {
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ast_log(LOG_ERROR, "Could not create thread for sending keepalive messages.\n");
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2016-05-18 22:37:27 +00:00
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keepalive_thread = AST_PTHREADT_NULL;
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keepalive_interval = 0;
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2014-10-17 13:17:58 +00:00
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}
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}
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/*! \brief Observer which is used to update our interval when the global setting changes */
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static struct ast_sorcery_observer keepalive_global_observer = {
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.loaded = keepalive_global_loaded,
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};
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2016-03-08 18:12:16 +00:00
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/*!
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* \brief
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* On incoming TCP connections, when we receive a SIP request, we mark that we have
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* received a valid SIP request. This way, we will not shut the transport down for
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* idleness
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*/
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static pj_bool_t idle_monitor_on_rx_request(pjsip_rx_data *rdata)
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{
|
2016-05-18 22:37:27 +00:00
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struct ao2_container *transports;
|
2016-03-08 18:12:16 +00:00
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struct monitored_transport *idle_trans;
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2016-05-18 22:37:27 +00:00
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transports = ao2_global_obj_ref(monitored_transports);
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if (!transports) {
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return PJ_FALSE;
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}
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|
2016-03-08 18:12:16 +00:00
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idle_trans = ao2_find(transports, rdata->tp_info.transport->obj_name, OBJ_SEARCH_KEY);
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2016-05-18 22:37:27 +00:00
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ao2_ref(transports, -1);
|
2016-03-08 18:12:16 +00:00
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if (!idle_trans) {
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return PJ_FALSE;
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}
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|
2016-05-18 22:37:27 +00:00
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idle_trans->sip_received = 1;
|
2016-03-08 18:12:16 +00:00
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ao2_ref(idle_trans, -1);
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|
|
|
|
|
|
return PJ_FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static pjsip_module idle_monitor_module = {
|
|
|
|
.name = {"idle monitor module", 19},
|
|
|
|
.priority = PJSIP_MOD_PRIORITY_TRANSPORT_LAYER + 3,
|
|
|
|
.on_rx_request = idle_monitor_on_rx_request,
|
|
|
|
};
|
|
|
|
|
2014-10-17 13:17:58 +00:00
|
|
|
static int load_module(void)
|
|
|
|
{
|
2016-05-18 22:37:27 +00:00
|
|
|
struct ao2_container *transports;
|
2016-03-08 18:12:16 +00:00
|
|
|
pjsip_tpmgr *tpmgr;
|
|
|
|
|
2015-02-04 01:27:52 +00:00
|
|
|
CHECK_PJSIP_MODULE_LOADED();
|
|
|
|
|
2016-05-18 22:37:27 +00:00
|
|
|
tpmgr = pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint());
|
|
|
|
if (!tpmgr) {
|
|
|
|
ast_log(LOG_ERROR, "No transport manager to attach keepalive functionality to.\n");
|
|
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
|
|
}
|
|
|
|
|
2016-03-08 18:12:16 +00:00
|
|
|
transports = ao2_container_alloc(TRANSPORTS_BUCKETS, monitored_transport_hash_fn,
|
|
|
|
monitored_transport_cmp_fn);
|
|
|
|
if (!transports) {
|
|
|
|
ast_log(LOG_ERROR, "Could not create container for transports to perform keepalive on.\n");
|
|
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
|
|
}
|
2016-05-18 22:37:27 +00:00
|
|
|
ao2_global_obj_replace_unref(monitored_transports, transports);
|
|
|
|
ao2_ref(transports, -1);
|
2016-03-08 18:12:16 +00:00
|
|
|
|
|
|
|
sched = ast_sched_context_create();
|
|
|
|
if (!sched) {
|
|
|
|
ast_log(LOG_ERROR, "Failed to create keepalive scheduler context.\n");
|
2016-05-18 22:37:27 +00:00
|
|
|
ao2_global_obj_release(monitored_transports);
|
2016-03-08 18:12:16 +00:00
|
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ast_sched_start_thread(sched)) {
|
|
|
|
ast_log(LOG_ERROR, "Failed to start keepalive scheduler thread\n");
|
|
|
|
ast_sched_context_destroy(sched);
|
2016-05-18 22:37:27 +00:00
|
|
|
sched = NULL;
|
|
|
|
ao2_global_obj_release(monitored_transports);
|
2016-03-08 18:12:16 +00:00
|
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
|
|
}
|
|
|
|
|
|
|
|
ast_sip_register_service(&idle_monitor_module);
|
|
|
|
|
|
|
|
tpmgr_state_callback = pjsip_tpmgr_get_state_cb(tpmgr);
|
|
|
|
pjsip_tpmgr_set_state_cb(tpmgr, &monitored_transport_state_callback);
|
|
|
|
|
2014-10-17 13:17:58 +00:00
|
|
|
ast_sorcery_observer_add(ast_sip_get_sorcery(), "global", &keepalive_global_observer);
|
|
|
|
ast_sorcery_reload_object(ast_sip_get_sorcery(), "global");
|
2016-05-18 22:37:27 +00:00
|
|
|
|
2015-03-26 17:47:42 +00:00
|
|
|
ast_module_shutdown_ref(ast_module_info->self);
|
2014-10-17 13:17:58 +00:00
|
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int unload_module(void)
|
|
|
|
{
|
2016-05-18 22:37:27 +00:00
|
|
|
pjsip_tpmgr *tpmgr;
|
2016-04-18 18:41:34 +00:00
|
|
|
|
|
|
|
if (keepalive_interval) {
|
|
|
|
keepalive_interval = 0;
|
2016-05-18 22:37:27 +00:00
|
|
|
if (keepalive_thread != AST_PTHREADT_NULL) {
|
|
|
|
pthread_kill(keepalive_thread, SIGURG);
|
|
|
|
pthread_join(keepalive_thread, NULL);
|
|
|
|
keepalive_thread = AST_PTHREADT_NULL;
|
|
|
|
}
|
2016-04-18 18:41:34 +00:00
|
|
|
}
|
|
|
|
|
2016-05-18 22:37:27 +00:00
|
|
|
ast_sorcery_observer_remove(ast_sip_get_sorcery(), "global", &keepalive_global_observer);
|
|
|
|
|
|
|
|
tpmgr = pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint());
|
|
|
|
if (tpmgr) {
|
|
|
|
pjsip_tpmgr_set_state_cb(tpmgr, tpmgr_state_callback);
|
|
|
|
}
|
2016-04-18 18:41:34 +00:00
|
|
|
|
|
|
|
ast_sip_unregister_service(&idle_monitor_module);
|
2016-05-18 22:37:27 +00:00
|
|
|
|
|
|
|
ast_sched_context_destroy(sched);
|
|
|
|
sched = NULL;
|
|
|
|
|
|
|
|
ao2_global_obj_release(monitored_transports);
|
|
|
|
|
2014-10-17 13:17:58 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int reload_module(void)
|
|
|
|
{
|
|
|
|
ast_sorcery_reload_object(ast_sip_get_sorcery(), "global");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-03-08 18:12:16 +00:00
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Reliable Transport Management",
|
2015-05-06 00:49:04 +00:00
|
|
|
.support_level = AST_MODULE_SUPPORT_CORE,
|
|
|
|
.load = load_module,
|
|
|
|
.reload = reload_module,
|
|
|
|
.unload = unload_module,
|
|
|
|
.load_pri = AST_MODPRI_CHANNEL_DEPEND - 4,
|
|
|
|
);
|