If an authenticated incoming caller does not respond to our 200 OK INVITE response with an ACK then PJSIP will hangup the call. Unfortunately, there is a chance that the session's channel will go away between one use of the channel pointer and another when building the BYE request because the BYE is being built by the monitor thread and not the call's serializer thread. * Added a check to ensure that the thread trying to add the Reason header is the call's serializer thread. This ensures that the channel will not go away on us. Change-Id: I866388d2b97ea2032eaae3f3ab3f1ca6cbd2df89
160 lines
4.3 KiB
C
160 lines
4.3 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, 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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<depend>res_pjsip_session</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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#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/res_pjsip_session.h"
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#include "asterisk/module.h"
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#include "asterisk/causes.h"
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#include "asterisk/threadpool.h"
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static void rfc3326_use_reason_header(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
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{
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const pj_str_t str_reason = { "Reason", 6 };
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pjsip_generic_string_hdr *header = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &str_reason, NULL);
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char buf[20], *cause, *text;
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int code;
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if (!header) {
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return;
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}
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ast_copy_pj_str(buf, &header->hvalue, sizeof(buf));
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cause = ast_skip_blanks(buf);
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if (strncasecmp(cause, "Q.850", 5) || !(cause = strstr(cause, "cause="))) {
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return;
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}
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/* If text is present get rid of it */
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if ((text = strstr(cause, ";"))) {
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*text = '\0';
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}
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if (sscanf(cause, "cause=%30d", &code) != 1) {
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return;
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}
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ast_channel_hangupcause_set(session->channel, code & 0x7f);
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}
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static int rfc3326_incoming_request(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
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{
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if ((pjsip_method_cmp(&rdata->msg_info.msg->line.req.method, &pjsip_bye_method) &&
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pjsip_method_cmp(&rdata->msg_info.msg->line.req.method, &pjsip_cancel_method)) ||
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!session->channel) {
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return 0;
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}
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rfc3326_use_reason_header(session, rdata);
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return 0;
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}
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static void rfc3326_incoming_response(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
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{
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struct pjsip_status_line status = rdata->msg_info.msg->line.status;
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if ((status.code < 300) || !session->channel) {
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return;
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}
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rfc3326_use_reason_header(session, rdata);
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}
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static void rfc3326_add_reason_header(struct ast_sip_session *session, struct pjsip_tx_data *tdata)
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{
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char buf[20];
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snprintf(buf, sizeof(buf), "Q.850;cause=%i", ast_channel_hangupcause(session->channel) & 0x7f);
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ast_sip_add_header(tdata, "Reason", buf);
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if (ast_channel_hangupcause(session->channel) == AST_CAUSE_ANSWERED_ELSEWHERE) {
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ast_sip_add_header(tdata, "Reason", "SIP;cause=200;text=\"Call completed elsewhere\"");
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}
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}
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static void rfc3326_outgoing_request(struct ast_sip_session *session, struct pjsip_tx_data *tdata)
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{
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if ((pjsip_method_cmp(&tdata->msg->line.req.method, &pjsip_bye_method)
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&& pjsip_method_cmp(&tdata->msg->line.req.method, &pjsip_cancel_method))
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|| !session->channel
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/*
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* The session->channel has been seen to go away on us between
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* checks so we must also be running under the call's serializer
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* thread.
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*/
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|| session->serializer != ast_threadpool_serializer_get_current()) {
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return;
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}
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rfc3326_add_reason_header(session, tdata);
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}
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static void rfc3326_outgoing_response(struct ast_sip_session *session, struct pjsip_tx_data *tdata)
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{
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struct pjsip_status_line status = tdata->msg->line.status;
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if (status.code < 300
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|| !session->channel
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|| session->serializer != ast_threadpool_serializer_get_current()) {
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return;
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}
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rfc3326_add_reason_header(session, tdata);
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}
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static struct ast_sip_session_supplement rfc3326_supplement = {
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.incoming_request = rfc3326_incoming_request,
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.incoming_response = rfc3326_incoming_response,
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.outgoing_request = rfc3326_outgoing_request,
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.outgoing_response = rfc3326_outgoing_response,
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};
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static int load_module(void)
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{
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CHECK_PJSIP_SESSION_MODULE_LOADED();
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ast_sip_session_register_supplement(&rfc3326_supplement);
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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ast_sip_session_unregister_supplement(&rfc3326_supplement);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP RFC3326 Support",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND,
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);
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