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/**
* @file bfcp.c BFCP client
*
* Copyright (C) 2011 Creytiv.com
*/
#include <stdlib.h>
#include <re.h>
#include <baresip.h>
#include "core.h"
struct bfcp {
struct bfcp_conn *conn;
struct sdp_media *sdpm;
struct mnat_media *mnat_st;
bool active;
/* server */
uint32_t lconfid;
uint16_t luserid;
};
static void destructor(void *arg)
{
struct bfcp *bfcp = arg;
mem_deref(bfcp->mnat_st);
mem_deref(bfcp->sdpm);
mem_deref(bfcp->conn);
}
static const char *bfcp_sdp_transp(enum bfcp_transp tp)
{
switch (tp) {
case BFCP_UDP: return "UDP/BFCP";
case BFCP_DTLS: return "UDP/TLS/BFCP";
default: return NULL;
}
}
static enum bfcp_transp str2tp(const char *proto)
{
if (0 == str_casecmp(proto, "udp"))
return BFCP_UDP;
else if (0 == str_casecmp(proto, "dtls"))
return BFCP_DTLS;
else {
warning("unsupported BFCP protocol: %s\n", proto);
return -1;
}
}
static void bfcp_resp_handler(int err, const struct bfcp_msg *msg, void *arg)
{
struct bfcp *bfcp = arg;
(void)bfcp;
if (err) {
warning("bfcp: error response: %m\n", err);
return;
}
info("bfcp: received BFCP response: '%s'\n",
bfcp_prim_name(msg->prim));
}
static void bfcp_msg_handler(const struct bfcp_msg *msg, void *arg)
{
struct bfcp *bfcp = arg;
info("bfcp: received BFCP message '%s'\n", bfcp_prim_name(msg->prim));
switch (msg->prim) {
case BFCP_HELLO:
(void)bfcp_reply(bfcp->conn, msg, BFCP_HELLO_ACK, 0);
break;
default:
(void)bfcp_ereply(bfcp->conn, msg, BFCP_UNKNOWN_PRIM);
break;
}
}
int bfcp_alloc(struct bfcp **bfcpp, struct sdp_session *sdp_sess,
const char *proto, bool offerer,
const struct mnat *mnat, struct mnat_sess *mnat_sess)
{
struct bfcp *bfcp;
struct sa laddr;
enum bfcp_transp transp;
int err;
if (!bfcpp || !sdp_sess)
return EINVAL;
transp = str2tp(proto);
bfcp = mem_zalloc(sizeof(*bfcp), destructor);
if (!bfcp)
return ENOMEM;
bfcp->active = offerer;
sa_init(&laddr, AF_INET);
err = bfcp_listen(&bfcp->conn, transp, &laddr, uag_tls(),
bfcp_msg_handler, bfcp);
if (err)
goto out;
err = sdp_media_add(&bfcp->sdpm, sdp_sess, "application",
sa_port(&laddr), bfcp_sdp_transp(transp));
if (err)
goto out;
err = sdp_format_add(NULL, bfcp->sdpm, false, "*", NULL,
0, 0, NULL, NULL, NULL, false, NULL);
if (err)
goto out;
err |= sdp_media_set_lattr(bfcp->sdpm, true, "floorctrl", "c-s");
err |= sdp_media_set_lattr(bfcp->sdpm, true, "setup",
bfcp->active ? "active" : "actpass");
if (bfcp->active) {
err |= sdp_media_set_lattr(bfcp->sdpm, true,
"connection", "new");
}
else {
bfcp->lconfid = 1000 + (rand_u16() & 0xf);
bfcp->luserid = 1 + (rand_u16() & 0x7);
err |= sdp_media_set_lattr(bfcp->sdpm, true, "confid",
"%u", bfcp->lconfid);
err |= sdp_media_set_lattr(bfcp->sdpm, true, "userid",
"%u", bfcp->luserid);
}
if (err)
goto out;
if (mnat) {
info("bfcp: enabled medianat '%s' on UDP socket\n", mnat->id);
err = mnat->mediah(&bfcp->mnat_st, mnat_sess, IPPROTO_UDP,
bfcp_sock(bfcp->conn), NULL, bfcp->sdpm);
if (err)
goto out;
}
info("bfcp: %s BFCP agent protocol '%s' on port %d\n",
bfcp->active ? "Active" : "Passive",
proto, sa_port(&laddr));
out:
if (err)
mem_deref(bfcp);
else
*bfcpp = bfcp;
return err;
}
int bfcp_start(struct bfcp *bfcp)
{
const struct sa *paddr;
uint32_t confid = 0;
uint16_t userid = 0;
int err = 0;
if (!bfcp)
return EINVAL;
if (!sdp_media_rport(bfcp->sdpm)) {
info("bfcp channel is disabled\n");
return 0;
}
if (bfcp->active) {
paddr = sdp_media_raddr(bfcp->sdpm);
confid = sdp_media_rattr_u32(bfcp->sdpm, "confid");
userid = sdp_media_rattr_u32(bfcp->sdpm, "userid");
err = bfcp_request(bfcp->conn, paddr, BFCP_VER2, BFCP_HELLO,
confid, userid, bfcp_resp_handler, bfcp, 0);
}
return err;
}
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