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