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/*
* rtsp.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-22 - 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_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_RTSP
#include "ndpi_api.h"
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_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_RTSP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
/* 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 = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search RTSP\n");
if (packet->parsed_lines == 0)
{
ndpi_parse_packet_line_info(ndpi_struct, flow);
}
if (packet->parsed_lines > 0 &&
LINE_ENDS(packet->line[0], "RTSP/1.0") != 0)
{
ndpi_int_rtsp_add_connection(ndpi_struct, flow);
return;
}
if (flow->rtsprdt_stage == 0
&& !(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_RTCP)
) {
flow->rtsprdt_stage = 1 + packet->packet_direction;
NDPI_LOG_DBG2(ndpi_struct, "maybe handshake 1; need next packet, return\n");
return;
}
if (flow->packet_counter < 3 && flow->rtsprdt_stage == 1 + packet->packet_direction) {
NDPI_LOG_DBG2(ndpi_struct, "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_DBG2(ndpi_struct, "found RTSP/1.0 \n");
NDPI_LOG_INFO(ndpi_struct, "found RTSP\n");
ndpi_int_rtsp_add_connection(ndpi_struct, flow);
return;
}
}
if (packet->udp != NULL && flow->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN
&& ((NDPI_COMPARE_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_RTP) == 0)
|| (NDPI_COMPARE_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_RTCP) == 0)
)) {
NDPI_LOG_DBG2(ndpi_struct,
"maybe RTSP RTP, RTSP RTCP, RDT; need next packet.\n");
return;
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
void init_rtsp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("RTSP", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_RTSP,
ndpi_search_rtsp_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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