mirror of
https://github.com/vel21ripn/nDPI.git
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117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/*
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* rtsp.c
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*
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* Copyright (C) 2009-2011 by ipoque GmbH
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* Copyright (C) 2011-19 - ntop.org
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*
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* This file is part of nDPI, an open source deep packet inspection
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* library based on the OpenDPI and PACE technology by ipoque GmbH
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*
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* nDPI is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* nDPI is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "ndpi_protocol_ids.h"
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#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_RTSP
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#include "ndpi_api.h"
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static void ndpi_int_rtsp_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
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struct ndpi_flow_struct *flow/* , */
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/* ndpi_protocol_type_t protocol_type */)
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{
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ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_RTSP, NDPI_PROTOCOL_UNKNOWN);
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}
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/* this function searches for a rtsp-"handshake" over tcp or udp. */
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void ndpi_search_rtsp_tcp_udp(struct ndpi_detection_module_struct
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*ndpi_struct, struct ndpi_flow_struct *flow)
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{
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struct ndpi_packet_struct *packet = &flow->packet;
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struct ndpi_id_struct *src = flow->src;
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struct ndpi_id_struct *dst = flow->dst;
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NDPI_LOG_DBG(ndpi_struct, "search RTSP\n");
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if (flow->rtsprdt_stage == 0
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&& !(packet->detected_protocol_stack[0] == NDPI_PROTOCOL_RTCP)
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) {
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flow->rtsprdt_stage = 1 + packet->packet_direction;
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NDPI_LOG_DBG2(ndpi_struct, "maybe handshake 1; need next packet, return\n");
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return;
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}
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if (flow->packet_counter < 3 && flow->rtsprdt_stage == 1 + packet->packet_direction) {
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NDPI_LOG_DBG2(ndpi_struct, "maybe handshake 2; need next packet\n");
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return;
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}
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if (packet->payload_packet_len > 20 && flow->rtsprdt_stage == 2 - packet->packet_direction) {
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char buf[32] = { 0 };
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u_int len = packet->payload_packet_len;
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if(len >= (sizeof(buf)-1)) len = sizeof(buf)-1;
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strncpy(buf, (const char*)packet->payload, len);
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// RTSP Server Message
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if((memcmp(packet->payload, "RTSP/1.0 ", 9) == 0)
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|| (strstr(buf, "rtsp://") != NULL)) {
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NDPI_LOG_DBG2(ndpi_struct, "found RTSP/1.0 \n");
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if (dst != NULL) {
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NDPI_LOG_DBG2(ndpi_struct, "found dst\n");
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ndpi_packet_src_ip_get(packet, &dst->rtsp_ip_address);
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dst->rtsp_timer = packet->tick_timestamp;
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dst->rtsp_ts_set = 1;
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}
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if (src != NULL) {
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NDPI_LOG_DBG2(ndpi_struct, "found src\n");
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ndpi_packet_dst_ip_get(packet, &src->rtsp_ip_address);
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src->rtsp_timer = packet->tick_timestamp;
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src->rtsp_ts_set = 1;
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}
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NDPI_LOG_INFO(ndpi_struct, "found RTSP\n");
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flow->rtsp_control_flow = 1;
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ndpi_int_rtsp_add_connection(ndpi_struct, flow);
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return;
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}
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}
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if (packet->udp != NULL && packet->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN
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&& ((NDPI_COMPARE_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_RTP) == 0)
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|| (NDPI_COMPARE_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_RTCP) == 0)
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)) {
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NDPI_LOG_DBG2(ndpi_struct,
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"maybe RTSP RTP, RTSP RTCP, RDT; need next packet.\n");
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return;
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}
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NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
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return;
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}
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void init_rtsp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
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{
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ndpi_set_bitmask_protocol_detection("RTSP", ndpi_struct, detection_bitmask, *id,
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NDPI_PROTOCOL_RTSP,
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ndpi_search_rtsp_tcp_udp,
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NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD,
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SAVE_DETECTION_BITMASK_AS_UNKNOWN,
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ADD_TO_DETECTION_BITMASK);
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*id += 1;
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}
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