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Initial import from SVN
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Luca Deri
parent
7fa4694dad
commit
2e5ceac844
204 changed files with 47689 additions and 1 deletions
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src/lib/protocols/sip.c
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src/lib/protocols/sip.c
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/*
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* sip.c
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*
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* Copyright (C) 2009-2011 by ipoque GmbH
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* Copyright (C) 2011-15 - 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_api.h"
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#ifdef NDPI_PROTOCOL_SIP
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static void ndpi_int_sip_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
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struct ndpi_flow_struct *flow,
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u_int8_t due_to_correlation)
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{
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ndpi_int_add_connection(ndpi_struct, flow,
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NDPI_PROTOCOL_SIP,
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due_to_correlation ? NDPI_CORRELATED_PROTOCOL : NDPI_REAL_PROTOCOL);
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}
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#if !defined(WIN32)
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static inline
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#else
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__forceinline static
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#endif
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void ndpi_search_sip_handshake(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=ndpi_struct->src;
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// struct ndpi_id_struct *dst=ndpi_struct->dst;
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const u_int8_t *packet_payload = packet->payload;
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u_int32_t payload_len = packet->payload_packet_len;
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if (payload_len > 4) {
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/* search for STUN Turn ChannelData Prefix */
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u_int16_t message_len = ntohs(get_u_int16_t(packet->payload, 2));
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if (payload_len - 4 == message_len) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found STUN TURN ChannelData prefix.\n");
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payload_len -= 4;
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packet_payload += 4;
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}
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}
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#ifndef NDPI_PROTOCOL_YAHOO
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if (payload_len >= 14 && packet_payload[payload_len - 2] == 0x0d && packet_payload[payload_len - 1] == 0x0a)
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#endif
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#ifdef NDPI_PROTOCOL_YAHOO
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if (payload_len >= 14)
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#endif
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{
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if ((memcmp(packet_payload, "NOTIFY ", 7) == 0 || memcmp(packet_payload, "notify ", 7) == 0)
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&& (memcmp(&packet_payload[7], "SIP:", 4) == 0 || memcmp(&packet_payload[7], "sip:", 4) == 0)) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip NOTIFY.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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if ((memcmp(packet_payload, "REGISTER ", 9) == 0 || memcmp(packet_payload, "register ", 9) == 0)
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&& (memcmp(&packet_payload[9], "SIP:", 4) == 0 || memcmp(&packet_payload[9], "sip:", 4) == 0)) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip REGISTER.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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if ((memcmp(packet_payload, "INVITE ", 7) == 0 || memcmp(packet_payload, "invite ", 7) == 0)
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&& (memcmp(&packet_payload[7], "SIP:", 4) == 0 || memcmp(&packet_payload[7], "sip:", 4) == 0)) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip INVITE.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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/* seen this in second direction on the third position,
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* maybe it could be deleted, if somebody sees it in the first direction,
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* please delete this comment.
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*/
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/*
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if (memcmp(packet_payload, "SIP/2.0 200 OK", 14) == 0 || memcmp(packet_payload, "sip/2.0 200 OK", 14) == 0) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip SIP/2.0 0K.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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*/
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if (memcmp(packet_payload, "SIP/2.0 ", 8) == 0 || memcmp(packet_payload, "sip/2.0 ", 8) == 0) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip SIP/2.0 *.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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if ((memcmp(packet_payload, "BYE ", 4) == 0 || memcmp(packet_payload, "bye ", 4) == 0)
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&& (memcmp(&packet_payload[4], "SIP:", 4) == 0 || memcmp(&packet_payload[4], "sip:", 4) == 0)) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip BYE.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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if ((memcmp(packet_payload, "ACK ", 4) == 0 || memcmp(packet_payload, "ack ", 4) == 0)
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&& (memcmp(&packet_payload[4], "SIP:", 4) == 0 || memcmp(&packet_payload[4], "sip:", 4) == 0)) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip ACK.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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if ((memcmp(packet_payload, "CANCEL ", 7) == 0 || memcmp(packet_payload, "cancel ", 7) == 0)
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&& (memcmp(&packet_payload[4], "SIP:", 7) == 0 || memcmp(&packet_payload[4], "sip:", 7) == 0)) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip CANCEL.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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/* Courtesy of Miguel Quesada <mquesadab@gmail.com> */
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if ((memcmp(packet_payload, "OPTIONS ", 8) == 0
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|| memcmp(packet_payload, "options ", 8) == 0)
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&& (memcmp(&packet_payload[8], "SIP:", 4) == 0
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|| memcmp(&packet_payload[8], "sip:", 4) == 0)) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip OPTIONS.\n");
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ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
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return;
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}
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}
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/* add bitmask for tcp only, some stupid udp programs
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* send a very few (< 10 ) packets before invite (mostly a 0x0a0x0d, but just search the first 3 payload_packets here */
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if (packet->udp != NULL && flow->packet_counter < 20) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "need next packet.\n");
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return;
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}
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#ifdef NDPI_PROTOCOL_STUN
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/* for STUN flows we need some more packets */
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if (packet->udp != NULL && flow->detected_protocol_stack[0] == NDPI_PROTOCOL_STUN && flow->packet_counter < 40) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "need next STUN packet.\n");
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return;
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}
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#endif
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if (payload_len == 4 && get_u_int32_t(packet_payload, 0) == 0) {
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "maybe sip. need next packet.\n");
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return;
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}
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#ifdef NDPI_PROTOCOL_YAHOO
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if (payload_len > 30 && packet_payload[0] == 0x90
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&& packet_payload[3] == payload_len - 20 && get_u_int32_t(packet_payload, 4) == 0
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&& get_u_int32_t(packet_payload, 8) == 0) {
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flow->sip_yahoo_voice = 1;
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "maybe sip yahoo. need next packet.\n");
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}
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if (flow->sip_yahoo_voice && flow->packet_counter < 10) {
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return;
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}
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#endif
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "exclude sip.\n");
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NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SIP);
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return;
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}
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void ndpi_search_sip(struct ndpi_detection_module_struct *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_flow_struct *flow = ndpi_struct->flow;
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// struct ndpi_id_struct *src=ndpi_struct->src;
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// struct ndpi_id_struct *dst=ndpi_struct->dst;
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NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "sip detection...\n");
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/* skip marked packets */
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if (packet->detected_protocol_stack[0] != NDPI_PROTOCOL_SIP) {
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if (packet->tcp_retransmission == 0) {
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ndpi_search_sip_handshake(ndpi_struct, flow);
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}
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}
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}
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#endif
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