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/*
* mgcp.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_MGCP
static void ndpi_int_mgcp_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_MGCP, NDPI_REAL_PROTOCOL);
}
#if !defined(WIN32)
static inline
#else
__forceinline static
#endif
void ndpi_search_mgcp_connection(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;
/* information about MGCP taken from http://en.wikipedia.org/wiki/MGCP */
u_int16_t pos = 4;
if (packet->payload_packet_len < 8) {
goto mgcp_excluded;
}
/* packet must end with 0x0d0a or with 0x0a */
if (packet->payload[packet->payload_packet_len - 1] != 0x0a
&& get_u_int16_t(packet->payload, packet->payload_packet_len - 2) != htons(0x0d0a)) {
goto mgcp_excluded;
}
if (packet->payload[0] != 'A' && packet->payload[0] != 'C' && packet->payload[0] != 'D' &&
packet->payload[0] != 'E' && packet->payload[0] != 'M' && packet->payload[0] != 'N' &&
packet->payload[0] != 'R') {
goto mgcp_excluded;
}
if (memcmp(packet->payload, "AUEP ", 5) != 0 && memcmp(packet->payload, "AUCX ", 5) != 0 &&
memcmp(packet->payload, "CRCX ", 5) != 0 && memcmp(packet->payload, "DLCX ", 5) != 0 &&
memcmp(packet->payload, "EPCF ", 5) != 0 && memcmp(packet->payload, "MDCX ", 5) != 0 &&
memcmp(packet->payload, "NTFY ", 5) != 0 && memcmp(packet->payload, "RQNT ", 5) != 0 &&
memcmp(packet->payload, "RSIP ", 5) != 0) {
goto mgcp_excluded;
}
// now search for string "MGCP " in the rest of the message
while ((pos + 5) < packet->payload_packet_len) {
if (memcmp(&packet->payload[pos], "MGCP ", 5) == 0) {
NDPI_LOG(NDPI_PROTOCOL_MGCP, ndpi_struct, NDPI_LOG_DEBUG, "MGCP match.\n");
ndpi_int_mgcp_add_connection(ndpi_struct, flow);
return;
}
pos++;
}
mgcp_excluded:
NDPI_LOG(NDPI_PROTOCOL_MGCP, ndpi_struct, NDPI_LOG_DEBUG, "exclude MGCP.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_MGCP);
}
void ndpi_search_mgcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_search_mgcp_connection(ndpi_struct, flow);
}
#endif
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