static bool udp_helper_send(int *err, struct sa *dst,
struct mbuf *mb, void *arg)
{
struct menc_media *st = arg;
unsigned int length;
zrtp_status_t s;
const char *proto_name = "rtp";
enum pkt_type ptype = get_packet_type(mb);
if (drop_packets(st))
return true;
length = (unsigned int)mbuf_get_left(mb);
/* only RTP/RTCP packets should be processed */
if (ptype == PKT_TYPE_RTCP) {
proto_name = "rtcp";
s = zrtp_process_rtcp(st->zrtp_stream,
(char *)mbuf_buf(mb), &length);
}
else if (ptype == PKT_TYPE_RTP) {
s = zrtp_process_rtp(st->zrtp_stream,
(char *)mbuf_buf(mb), &length);
}
else
return false;
if (s != zrtp_status_ok) {
if (s == zrtp_status_drop)
return true;
warning("zrtp: send(port=%d): zrtp_process_%s failed"
" (status = %d '%s')\n",
sa_port(dst), proto_name, s, zrtp_log_status2str(s));
return false;
}
/* make sure target buffer is large enough */
if (length > mbuf_get_space(mb)) {
warning("zrtp: zrtp_process_%s: length > space (%u > %u)\n",
proto_name, length, mbuf_get_space(mb));
*err = ENOMEM;
}
mb->end = mb->pos + length;
return false;
}
void *process_outgoing(void *param)
#endif
{
unsigned packets_counter = 0;
zrtp_endpoint_t *the_endpoint = (zrtp_endpoint_t *)param;
while (the_endpoint->is_running) {
zrtp_test_stream_t* stream = NULL;
unsigned i;
zrtp_status_t s = zrtp_status_fail;
zrtp_test_packet_t* packet;
zrtp_queue_elem_t* elem;
char* word = NULL;
zrtp_sleep(K_ZRTP_TEST_RTP_RATE);
/* Get random channel to operate with and select random peer */
stream = get_stream_to_process_(the_endpoint);
if (!stream) {
continue;
}
elem = zrtp_sys_alloc(sizeof(zrtp_queue_elem_t));
if (!elem) {
break;
}
packet = (zrtp_test_packet_t*) elem->data;
packet->is_rtp = (packets_counter++ % 20); /* Every 20-th packet is RTCP */
/*
* Construct RTP/RTCP Packet
*/
if (packet->is_rtp)
{
ZRTP_UNALIGNED(zrtp_rtp_hdr_t) *rtp_hdr = (zrtp_rtp_hdr_t*)packet->body;
/* Fill RTP Header according to the specification */
zrtp_memset(rtp_hdr, 0, sizeof(zrtp_rtp_hdr_t));
rtp_hdr->version = 2; /* Current RTP version 2 */
rtp_hdr->pt = 0; /* PCMU padding type */
rtp_hdr->ssrc = zrtp_hton32(stream->id); /* Use stream Identifier as it's SSRC */
if (stream->seq >= 0xFFFF) {
stream->seq = 0;
}
rtp_hdr->seq = zrtp_hton16(stream->seq++);
rtp_hdr->ts = zrtp_hton32((uint32_t)(zrtp_time_now()/1000));
/* Get RTP body from PGP words lists */
word = (char*)(i ? hash_word_list_odd[packets_counter % 256] : hash_word_list_even[packets_counter % 256]);
zrtp_memcpy(packet->body + sizeof(zrtp_rtp_hdr_t), word, (uint32_t)strlen(word));
packet->length = sizeof(zrtp_rtp_hdr_t) + (uint32_t)strlen(word);
/* Process RTP media with libzrtp */
s = zrtp_process_rtp(stream->zrtp, packet->body, &packet->length);
}
else {
ZRTP_UNALIGNED(zrtp_rtcp_hdr_t) *rtcp_hdr = (zrtp_rtcp_hdr_t*)packet->body;
/* Fill RTCP Header according to the specification */
rtcp_hdr->rc = 0;
rtcp_hdr->version = 2;
rtcp_hdr->ssrc = stream->id;
/* Get RTP body from PGP words lists. Put RTCP marker at the beginning */
zrtp_memcpy(packet->body + sizeof(zrtp_rtcp_hdr_t), "RTCP", 4);
word = (char*)( i ? hash_word_list_odd[packets_counter % 256] : hash_word_list_even[packets_counter % 256]);
zrtp_memcpy(packet->body + sizeof(zrtp_rtcp_hdr_t) + 4, word, (uint32_t)strlen(word));
packet->length = sizeof(zrtp_rtcp_hdr_t) + (uint32_t)strlen(word) + 4;
/* RTCP packets sould be 32 byes aligned */
packet->length += (packet->length % 4) ? (4 - packet->length % 4) : 0;
/* Process RTCP control with libzrtp */
s = zrtp_process_rtcp(stream->zrtp, packet->body, &packet->length);
}
elem->size = packet->length;
/* Handle zrtp_process_xxx() instructions */
switch (s) {
/* Put the packet to the queue ==> send packet to the other side pear */
case zrtp_status_ok: {
ZRTP_LOG(3, (_ZTU_,"Outgoing: (%s) [%p:ssrc=%u] OK. <%s%s> encrypted %d bytes.\n",
zrtp_log_state2str(stream->zrtp->state), stream->zrtp, stream->id, packet->is_rtp ? "" : "RTCP", word, packet->length));
zrtp_test_queue_push(stream->output, elem);
} break;
case zrtp_status_drop: {
ZRTP_LOG(1, (_ZTU_,"Outgoing: (%s) [%p:ssrc=%u] DROPPED.\n",
zrtp_log_state2str(stream->zrtp->state), stream->zrtp, stream->id));
} break;
case zrtp_status_fail: {
ZRTP_LOG(1, (_ZTU_,"Outgoing: (%s) [%p:ssrc=%u] ENCRYPT FAILED.\n",
zrtp_log_state2str(stream->zrtp->state), stream->zrtp, stream->id));
} break;
default:
break;
}
if (zrtp_status_ok != s) {
zrtp_sys_free(packet);
}
}
#if (ZRTP_PLATFORM == ZP_WIN32) || (ZRTP_PLATFORM == ZP_WINCE)
return 0;
#else
return NULL;
#endif
}
