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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013, Digium, Inc.
*
* Jason Parker <jparker@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_sip</depend>
<depend>res_sip_session</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <pjsip.h>
#include <pjsip_ua.h>
#include "asterisk/res_sip.h"
#include "asterisk/res_sip_session.h"
#include "asterisk/module.h"
static int dtmf_info_incoming_request(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
{
int res = 0;
pjsip_msg_body *body = rdata->msg_info.msg->body;
pjsip_tx_data *tdata;
char buf[body->len];
char *cur = buf;
char *line;
char event = '\0';
unsigned int duration = 0;
if (pj_strcmp2(&body->content_type.type, "application") ||
pj_strcmp2(&body->content_type.subtype, "dtmf-relay")) {
return 0;
}
body->print_body(body, buf, body->len);
while ((line = strsep(&cur, "\r\n"))) {
char *c;
if (!(c = strchr(line, '='))) {
continue;
}
*c++ = '\0';
c = ast_skip_blanks(c);
if (!strcasecmp(line, "signal")) {
if (c[0] == '!' || c[0] == '*' || c[0] == '#' ||
('0' <= c[0] && c[0] <= '9') ||
('A' <= c[0] && c[0] <= 'D') ||
('a' <= c[0] && c[0] <= 'd')) {
event = c[0];
} else {
ast_log(LOG_ERROR, "Invalid DTMF event signal in INFO message.\n");
res = -1;
break;
}
} else if (!strcasecmp(line, "duration")) {
sscanf(c, "%30u", &duration);
}
}
if (!duration) {
duration = 100;
}
if (event == '!') {
struct ast_frame f = { AST_FRAME_CONTROL, { AST_CONTROL_FLASH, } };
ast_queue_frame(session->channel, &f);
} else if (event != '\0') {
struct ast_frame f = { AST_FRAME_DTMF, };
f.len = duration;
f.subclass.integer = event;
ast_queue_frame(session->channel, &f);
} else {
res = -1;
}
if (pjsip_dlg_create_response(session->inv_session->dlg, rdata, !res ? 200 : 500, NULL, &tdata) == PJ_SUCCESS) {
struct pjsip_transaction *tsx = pjsip_rdata_get_tsx(rdata);
pjsip_dlg_send_response(session->inv_session->dlg, tsx, tdata);
}
return res;
}
static struct ast_sip_session_supplement dtmf_info_supplement = {
.method = "INFO",
.incoming_request = dtmf_info_incoming_request,
};
static int load_module(void)
{
ast_sip_session_register_supplement(&dtmf_info_supplement);
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
ast_sip_session_unregister_supplement(&dtmf_info_supplement);
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "SIP DTMF INFO Support",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND,
);
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