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/**
* @file mock/mock_menc.c Mock media encryption
*
* Copyright (C) 2010 - 2018 Creytiv.com
*/
#include <string.h>
#include <re.h>
#include <baresip.h>
#include "../test.h"
#define SECRET_KEY 0xdd
struct menc_media {
void *rtpsock;
struct udp_helper *uh_rtp;
};
/*
* Encrypt/decrypt an RTP payload with a dummy key.
* We use a simple XOR scheme for simplicity.
*/
static void mock_crypt(struct mbuf *mb)
{
size_t i, len = mbuf_get_left(mb);
for (i = RTP_HEADER_SIZE; i < len; i++) {
mb->buf[mb->pos + i] ^= SECRET_KEY;
}
}
static void media_destructor(void *data)
{
struct menc_media *mm = data;
mem_deref(mm->uh_rtp);
mem_deref(mm->rtpsock);
}
static bool send_handler(int *err, struct sa *dst, struct mbuf *mb, void *arg)
{
struct menc_media *mm = arg;
(void)mm;
(void)err;
(void)dst;
mock_crypt(mb);
return false; /* continue processing */
}
static bool recv_handler(struct sa *src, struct mbuf *mb, void *arg)
{
struct menc_media *mm = arg;
(void)mm;
(void)src;
mock_crypt(mb);
return false; /* continue processing */
}
static int mock_media_alloc(struct menc_media **mmp, struct menc_sess *sess,
struct rtp_sock *rtp, int proto,
void *rtpsock, void *rtcpsock,
struct sdp_media *sdpm)
{
struct menc_media *mm;
const int layer = 10; /* above zero */
int err = 0;
(void)sess;
(void)rtp;
(void)rtcpsock;
if (!mmp || !sdpm)
return EINVAL;
if (proto != IPPROTO_UDP)
return EPROTONOSUPPORT;
mm = *mmp;
if (!mm) {
mm = mem_zalloc(sizeof(*mm), media_destructor);
if (!mm)
return ENOMEM;
mm->rtpsock = mem_ref(rtpsock);
err = udp_register_helper(&mm->uh_rtp, rtpsock, layer,
send_handler, recv_handler, mm);
if (err)
goto out;
*mmp = mm;
}
out:
if (err)
mem_deref(mm);
return err;
}
static struct menc menc_mock = {
.id = "XRTP",
.sdp_proto = "RTP/XAVP",
.mediah = mock_media_alloc
};
void mock_menc_register(void)
{
menc_register(baresip_mencl(), &menc_mock);
}
void mock_menc_unregister(void)
{
menc_unregister(&menc_mock);
}
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