Some SBCs require responses to empty SIP INFO packets after establishing call via INVITE, if not responded to they may drop your call after unspecified timeout of X minutes. They are identified by having no Content-Type, check for this and respond with 200 - OK message. ASTERISK-24986 #close Reported-by: Ilya Trikoz, Federico Santulli Change-Id: Ib27e4f07151e5aef28fa587e4ead36c5b87c43e0
182 lines
4.1 KiB
C
182 lines
4.1 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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* Jason Parker <jparker@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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static int is_media_type(pjsip_rx_data *rdata, char *subtype)
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{
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return rdata->msg_info.ctype
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&& !pj_strcmp2(&rdata->msg_info.ctype->media.type, "application")
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&& !pj_strcmp2(&rdata->msg_info.ctype->media.subtype, subtype);
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}
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static void send_response(struct ast_sip_session *session,
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struct pjsip_rx_data *rdata, int code)
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{
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pjsip_tx_data *tdata;
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pjsip_dialog *dlg = session->inv_session->dlg;
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if (pjsip_dlg_create_response(dlg, rdata, code,
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NULL, &tdata) == PJ_SUCCESS) {
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struct pjsip_transaction *tsx = pjsip_rdata_get_tsx(rdata);
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pjsip_dlg_send_response(dlg, tsx, tdata);
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}
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}
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static char get_event(const char *c)
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{
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unsigned int event;
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if (*c == '!' || *c == '*' || *c == '#' ||
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('A' <= *c && *c <= 'D') ||
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('a' <= *c && *c <= 'd')) {
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return *c;
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}
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if ((sscanf(c, "%30u", &event) != 1) || event > 16) {
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return '\0';
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}
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if (event < 10) {
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return *c;
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}
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switch (event) {
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case 10: return '*';
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case 11: return '#';
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case 16: return '!';
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}
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return 'A' + (event - 12);
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}
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static int dtmf_info_incoming_request(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
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{
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pjsip_msg_body *body = rdata->msg_info.msg->body;
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char buf[body ? body->len + 1 : 1];
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char *cur = buf;
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char *line;
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char event = '\0';
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unsigned int duration = 100;
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char is_dtmf;
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int res;
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if (!session->channel) {
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return 0;
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}
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is_dtmf = is_media_type(rdata, "dtmf");
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if (!is_dtmf && !is_media_type(rdata, "dtmf-relay")) {
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return 0;
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}
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if (!body || !body->len) {
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/* need to return 200 OK on empty body */
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send_response(session, rdata, 200);
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return 1;
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}
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res = body->print_body(body, buf, body->len);
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if (res < 0) {
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send_response(session, rdata, 500);
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return 1;
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}
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buf[res] = '\0';
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if (is_dtmf) {
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/* directly use what is in the message body */
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event = get_event(cur);
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} else { /* content type = application/dtmf-relay */
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while ((line = strsep(&cur, "\r\n"))) {
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char *c;
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if (!(c = strchr(line, '='))) {
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continue;
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}
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*c++ = '\0';
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c = ast_skip_blanks(c);
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if (!strcasecmp(line, "signal")) {
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if (!(event = get_event(c))) {
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break;
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}
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} else if (!strcasecmp(line, "duration")) {
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sscanf(c, "%30u", &duration);
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}
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}
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}
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if (event == '!') {
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struct ast_frame f = { AST_FRAME_CONTROL, { AST_CONTROL_FLASH, } };
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ast_queue_frame(session->channel, &f);
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} else if (event != '\0') {
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struct ast_frame f = { AST_FRAME_DTMF, };
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f.len = duration;
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f.subclass.integer = event;
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ast_queue_frame(session->channel, &f);
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} else {
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ast_log(LOG_ERROR, "Invalid DTMF event signal in INFO message.\n");
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}
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send_response(session, rdata, event ? 200 : 500);
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return 1;
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}
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static struct ast_sip_session_supplement dtmf_info_supplement = {
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.method = "INFO",
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.priority = AST_SIP_SUPPLEMENT_PRIORITY_FIRST,
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.incoming_request = dtmf_info_incoming_request,
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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(&dtmf_info_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(&dtmf_info_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 DTMF INFO 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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