asterisk/res/res_pjsip_dtmf_info.c

183 lines
4.3 KiB
C

/*
* 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_pjsip</depend>
<depend>res_pjsip_session</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <pjsip.h>
#include <pjsip_ua.h>
#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_session.h"
#include "asterisk/module.h"
static int is_media_type(pjsip_rx_data *rdata, char *subtype)
{
return rdata->msg_info.ctype
&& !pj_strcmp2(&rdata->msg_info.ctype->media.type, "application")
&& !pj_strcmp2(&rdata->msg_info.ctype->media.subtype, subtype);
}
static void send_response(struct ast_sip_session *session,
struct pjsip_rx_data *rdata, int code)
{
pjsip_tx_data *tdata;
pjsip_dialog *dlg = session->inv_session->dlg;
if (pjsip_dlg_create_response(dlg, rdata, code,
NULL, &tdata) == PJ_SUCCESS) {
struct pjsip_transaction *tsx = pjsip_rdata_get_tsx(rdata);
pjsip_dlg_send_response(dlg, tsx, tdata);
}
}
static char get_event(const char *c)
{
unsigned int event;
if (*c == '!' || *c == '*' || *c == '#' ||
('A' <= *c && *c <= 'D') ||
('a' <= *c && *c <= 'd')) {
return *c;
}
if ((sscanf(c, "%30u", &event) != 1) || event > 16) {
return '\0';
}
if (event < 10) {
return *c;
}
switch (event) {
case 10: return '*';
case 11: return '#';
case 16: return '!';
}
return 'A' + (event - 12);
}
static int dtmf_info_incoming_request(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
{
pjsip_msg_body *body = rdata->msg_info.msg->body;
char buf[body ? body->len + 1 : 1];
char *cur = buf;
char *line;
char event = '\0';
unsigned int duration = 100;
char is_dtmf, is_dtmf_relay, is_flash;
int res;
if (!session->channel) {
return 0;
}
is_dtmf = is_media_type(rdata, "dtmf");
is_dtmf_relay = is_media_type(rdata, "dtmf-relay");
is_flash = is_media_type(rdata, "hook-flash");
if (!is_flash && !is_dtmf && !is_dtmf_relay) {
return 0;
}
if (!body || !body->len) {
/* need to return 200 OK on empty body */
send_response(session, rdata, 200);
return 1;
}
res = body->print_body(body, buf, body->len);
if (res < 0) {
send_response(session, rdata, 500);
return 1;
}
buf[res] = '\0';
if (is_dtmf) {
/* directly use what is in the message body */
event = get_event(cur);
} else if (is_dtmf_relay) { /* content type = application/dtmf-relay */
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 (!(event = get_event(c))) {
break;
}
} else if (!strcasecmp(line, "duration")) {
sscanf(c, "%30u", &duration);
}
}
}
if (event == '!' || is_flash) {
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 {
ast_log(LOG_ERROR, "Invalid DTMF event signal in INFO message.\n");
}
send_response(session, rdata, event ? 200 : 500);
return 1;
}
static struct ast_sip_session_supplement dtmf_info_supplement = {
.method = "INFO",
.priority = AST_SIP_SUPPLEMENT_PRIORITY_FIRST,
.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, "PJSIP DTMF INFO Support",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND,
.requires = "res_pjsip,res_pjsip_session",
);