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/**
* @file gzrtp.cpp GNU ZRTP: Media Path Key Agreement for Unicast Secure RTP
*
* Copyright (C) 2010 - 2017 Creytiv.com
*/
#include <stdint.h>
#include <re.h>
#include <baresip.h>
#include <string.h>
#include <libzrtpcpp/ZRtp.h>
#include "session.h"
#include "stream.h"
/**
* @defgroup gzrtp gzrtp
*
* ZRTP: Media Path Key Agreement for Unicast Secure RTP
*
* Experimental support for ZRTP
*
* See http://tools.ietf.org/html/rfc6189
*
*
* This module is using GNU ZRTP C++ library
*
* https://github.com/wernerd/ZRTPCPP
*
* Configuration options:
*
\verbatim
zrtp_parallel {yes,no} # Start all streams at once
\endverbatim
*
*/
static ZRTPConfig *s_zrtp_config = NULL;
struct menc_sess {
Session *session;
};
struct menc_media {
Stream *stream;
};
static void session_destructor(void *arg)
{
struct menc_sess *st = (struct menc_sess *)arg;
delete st->session;
}
static void media_destructor(void *arg)
{
struct menc_media *st = (struct menc_media *)arg;
delete st->stream;
}
static int session_alloc(struct menc_sess **sessp, struct sdp_session *sdp,
bool offerer, menc_error_h *errorh, void *arg)
{
struct menc_sess *st;
(void)offerer;
(void)errorh;
(void)arg;
int err = 0;
if (!sessp || !sdp)
return EINVAL;
st = (struct menc_sess *)mem_zalloc(sizeof(*st), session_destructor);
if (!st)
return ENOMEM;
st->session = new Session(*s_zrtp_config);
if (!st->session)
err = ENOMEM;
if (err)
mem_deref(st);
else
*sessp = st;
return err;
}
static int media_alloc(struct menc_media **stp, struct menc_sess *sess,
struct rtp_sock *rtp,
int proto, void *rtpsock, void *rtcpsock,
struct sdp_media *sdpm)
{
struct menc_media *st;
int err = 0;
StreamMediaType med_type;
const char *med_name;
if (!stp || !sess || !sess->session || proto != IPPROTO_UDP)
return EINVAL;
st = *stp;
if (st)
goto start;
st = (struct menc_media *)mem_zalloc(sizeof(*st), media_destructor);
if (!st)
return ENOMEM;
med_name = sdp_media_name(sdpm);
if (str_cmp(med_name, "audio") == 0)
med_type = MT_AUDIO;
else if (str_cmp(med_name, "video") == 0)
med_type = MT_VIDEO;
else if (str_cmp(med_name, "text") == 0)
med_type = MT_TEXT;
else if (str_cmp(med_name, "application") == 0)
med_type = MT_APPLICATION;
else if (str_cmp(med_name, "message") == 0)
med_type = MT_MESSAGE;
else
med_type = MT_UNKNOWN;
st->stream = sess->session->create_stream(
*s_zrtp_config,
(struct udp_sock *)rtpsock,
(struct udp_sock *)rtcpsock,
rtp_sess_ssrc(rtp), med_type);
if (!st->stream) {
err = ENOMEM;
goto out;
}
st->stream->sdp_encode(sdpm);
out:
if (err) {
mem_deref(st);
return err;
}
else
*stp = st;
start:
if (sa_isset(sdp_media_raddr(sdpm), SA_ALL)) {
st->stream->sdp_decode(sdpm);
err = sess->session->start_stream(st->stream);
if (err) {
warning("zrtp: stream start failed: %d\n", err);
}
}
return err;
}
static struct menc menc_zrtp = {
LE_INIT, "zrtp", "RTP/AVP", session_alloc, media_alloc
};
static const struct cmd cmdv[] = {
{"zrtp_verify", 0, CMD_PRM, "Verify ZRTP SAS <session ID>",
Session::cmd_verify_sas },
{"zrtp_unverify", 0, CMD_PRM, "Unverify ZRTP SAS <session ID>",
Session::cmd_unverify_sas },
};
static int module_init(void)
{
char config_path[256];
int err = 0;
err = conf_path_get(config_path, sizeof(config_path));
if (err) {
warning("zrtp: could not get config path: %m\n", err);
return err;
}
s_zrtp_config = new ZRTPConfig(conf_cur(), config_path);
if (!s_zrtp_config)
return ENOMEM;
menc_register(baresip_mencl(), &menc_zrtp);
return cmd_register(baresip_commands(), cmdv, ARRAY_SIZE(cmdv));
}
static int module_close(void)
{
delete s_zrtp_config;
s_zrtp_config = NULL;
cmd_unregister(baresip_commands(), cmdv);
menc_unregister(&menc_zrtp);
return 0;
}
extern "C" EXPORT_SYM const struct mod_export DECL_EXPORTS(gzrtp) = {
"gzrtp",
"menc",
module_init,
module_close
};
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