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/**
* @file b2bua.c Back-to-Back User-Agent (B2BUA) module
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <baresip.h>
/**
* @defgroup b2bua b2bua
*
* Back-to-Back User-Agent (B2BUA) module
*
* NOTE: This module is experimental.
*
* N session objects
* 1 session object has 2 call objects (left, right leg)
*/
struct session {
struct le le;
struct call *call_in, *call_out;
};
static struct list sessionl;
static struct ua *ua_in, *ua_out;
static struct call *other_call(struct session *sess, const struct call *call)
{
if (sess->call_in == call) return sess->call_out;
if (sess->call_out == call) return sess->call_in;
return NULL;
}
static void destructor(void *arg)
{
struct session *sess = arg;
debug("b2bua: session destroyed (in=%p, out=%p)\n",
sess->call_in, sess->call_out);
list_unlink(&sess->le);
mem_deref(sess->call_out);
mem_deref(sess->call_in);
}
static void call_event_handler(struct call *call, enum call_event ev,
const char *str, void *arg)
{
struct session *sess = arg;
struct call *call2 = other_call(sess, call);
switch (ev) {
case CALL_EVENT_ESTABLISHED:
debug("b2bua: CALL_ESTABLISHED: peer_uri=%s\n",
call_peeruri(call));
ua_answer(call_get_ua(call2), call2);
break;
case CALL_EVENT_CLOSED:
debug("b2bua: CALL_CLOSED: %s\n", str);
mem_ref(call2);
ua_hangup(call_get_ua(call2), call2, call_scode(call), "");
mem_deref(sess);
break;
default:
break;
}
}
static void call_dtmf_handler(struct call *call, char key, void *arg)
{
struct session *sess = arg;
debug("b2bua: relaying DTMF event: key = '%c'\n", key ? key : '.');
call_send_digit(other_call(sess, call), key);
}
static int new_session(struct call *call)
{
struct session *sess;
char a[64], b[64];
int err;
sess = mem_zalloc(sizeof(*sess), destructor);
if (!sess)
return ENOMEM;
sess->call_in = call;
err = ua_connect(ua_out, &sess->call_out, call_peeruri(call),
call_localuri(call), NULL,
call_has_video(call) ? VIDMODE_ON : VIDMODE_OFF);
if (err) {
warning("b2bua: ua_connect failed (%m)\n", err);
goto out;
}
re_snprintf(a, sizeof(a), "A-%x", sess);
re_snprintf(b, sizeof(b), "B-%x", sess);
/* connect the audio/video-bridge devices */
audio_set_devicename(call_audio(sess->call_in), a, b);
audio_set_devicename(call_audio(sess->call_out), b, a);
video_set_devicename(call_video(sess->call_in), a, b);
video_set_devicename(call_video(sess->call_out), b, a);
call_set_handlers(sess->call_in, call_event_handler,
call_dtmf_handler, sess);
call_set_handlers(sess->call_out, call_event_handler,
call_dtmf_handler, sess);
list_append(&sessionl, &sess->le, sess);
out:
if (err)
mem_deref(sess);
return err;
}
static void ua_event_handler(struct ua *ua, enum ua_event ev,
struct call *call, const char *prm, void *arg)
{
int err;
(void)prm;
(void)arg;
switch (ev) {
case UA_EVENT_CALL_INCOMING:
debug("b2bua: CALL_INCOMING: peer=%s --> local=%s\n",
call_peeruri(call), call_localuri(call));
err = new_session(call);
if (err) {
ua_hangup(ua, call, 500, "Server Error");
}
break;
default:
break;
}
}
static int b2bua_status(struct re_printf *pf, void *arg)
{
struct le *le;
int err = 0;
(void)arg;
err |= re_hprintf(pf, "B2BUA status:\n");
err |= re_hprintf(pf, " inbound: %s\n", ua_aor(ua_in));
err |= re_hprintf(pf, " outbound: %s\n", ua_aor(ua_out));
err |= re_hprintf(pf, "sessions:\n");
for (le = sessionl.head; le; le = le->next) {
struct session *sess = le->data;
err |= re_hprintf(pf, "%-42s ---> %42s\n",
call_peeruri(sess->call_in),
call_peeruri(sess->call_out));
err |= re_hprintf(pf, " %H\n", call_status, sess->call_in);
err |= re_hprintf(pf, " %H\n", call_status, sess->call_out);
}
return err;
}
static const struct cmd cmdv[] = {
{"b2bua", 0, 0, "b2bua status", b2bua_status },
};
static int module_init(void)
{
int err;
ua_in = uag_find_param("b2bua", "inbound");
ua_out = uag_find_param("b2bua", "outbound");
if (!ua_in) {
warning("b2bua: inbound UA not found\n");
return ENOENT;
}
if (!ua_out) {
warning("b2bua: outbound UA not found\n");
return ENOENT;
}
err = cmd_register(baresip_commands(), cmdv, ARRAY_SIZE(cmdv));
if (err)
return err;
err = uag_event_register(ua_event_handler, NULL);
if (err)
return err;
/* The inbound UA will handle all non-matching requests */
ua_set_catchall(ua_in, true);
debug("b2bua: module loaded\n");
return 0;
}
static int module_close(void)
{
debug("b2bua: module closing..\n");
if (!list_isempty(&sessionl)) {
info("b2bua: flushing %u sessions\n", list_count(&sessionl));
list_flush(&sessionl);
}
uag_event_unregister(ua_event_handler);
cmd_unregister(baresip_commands(), cmdv);
return 0;
}
const struct mod_export DECL_EXPORTS(b2bua) = {
"b2bua",
"application",
module_init,
module_close
};
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