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/*
* rtsp.c
*
* Copyright (C) 2009-2011 by ipoque GmbH
* Copyright (C) 2011-15 - ntop.org
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocols.h"
#ifdef NDPI_PROTOCOL_RTSP
#ifndef NDPI_PROTOCOL_RTP
#error RTSP requires RTP detection to work correctly
#endif
#ifndef NDPI_PROTOCOL_RTSP
#error RTSP requires RTSP detection to work correctly
#endif
#ifndef NDPI_PROTOCOL_RDP
#error RTSP requires RDP detection to work correctly
#endif
static void ndpi_int_rtsp_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow/* , */
/* ndpi_protocol_type_t protocol_type */)
{
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_RTSP/* , protocol_type */);
}
/* this function searches for a rtsp-"handshake" over tcp or udp. */
void ndpi_search_rtsp_tcp_udp(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
struct ndpi_id_struct *src = flow->src;
struct ndpi_id_struct *dst = flow->dst;
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_TRACE, "RTSP detection...\n");
if (flow->rtsprdt_stage == 0
#ifdef NDPI_PROTOCOL_RTCP
&& !(packet->detected_protocol_stack[0] == NDPI_PROTOCOL_RTCP)
#endif
) {
flow->rtsprdt_stage = 1 + packet->packet_direction;
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_DEBUG, "maybe handshake 1; need next packet, return.\n");
return;
}
if (flow->packet_counter < 3 && flow->rtsprdt_stage == 1 + packet->packet_direction) {
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_DEBUG, "maybe handshake 2; need next packet.\n");
return;
}
if (packet->payload_packet_len > 20 && flow->rtsprdt_stage == 2 - packet->packet_direction) {
char buf[32] = { 0 };
u_int len = packet->payload_packet_len;
if(len >= (sizeof(buf)-1)) len = sizeof(buf)-1;
strncpy(buf, (const char*)packet->payload, len);
// RTSP Server Message
if((memcmp(packet->payload, "RTSP/1.0 ", 9) == 0)
|| (strstr(buf, "rtsp://") != NULL)) {
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_TRACE, "found RTSP/1.0 .\n");
if (dst != NULL) {
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_TRACE, "found dst.\n");
ndpi_packet_src_ip_get(packet, &dst->rtsp_ip_address);
dst->rtsp_timer = packet->tick_timestamp;
dst->rtsp_ts_set = 1;
}
if (src != NULL) {
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_TRACE, "found src.\n");
ndpi_packet_dst_ip_get(packet, &src->rtsp_ip_address);
src->rtsp_timer = packet->tick_timestamp;
src->rtsp_ts_set = 1;
}
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_TRACE, "RTSP detected.\n");
flow->rtsp_control_flow = 1;
ndpi_int_rtsp_add_connection(ndpi_struct, flow/* , NDPI_REAL_PROTOCOL */);
return;
}
}
if (packet->udp != NULL && packet->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN
&& ((NDPI_COMPARE_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_RTP) == 0)
#ifdef NDPI_PROTOCOL_RTCP
|| (NDPI_COMPARE_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_RTCP) == 0)
#endif
)) {
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_DEBUG,
"maybe RTSP RTP, RTSP RTCP, RDT; need next packet.\n");
return;
}
NDPI_LOG(NDPI_PROTOCOL_RTSP, ndpi_struct, NDPI_LOG_DEBUG, "didn't find handshake, exclude.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_RTSP);
return;
}
#endif
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