diff options
Diffstat (limited to 'src/lib/protocols/rtsp.c')
| -rw-r--r-- | src/lib/protocols/rtsp.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/lib/protocols/rtsp.c b/src/lib/protocols/rtsp.c new file mode 100644 index 000000000..2614f0c6f --- /dev/null +++ b/src/lib/protocols/rtsp.c @@ -0,0 +1,120 @@ +/* + * 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 |