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/*
* mgcp.c
*
* Copyright (C) 2017-23 - 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_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_MGCP
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_mgcp_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found MGCP\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_MGCP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_mgcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
char const * endpoint;
char const * endpoint_hostname;
char const * mgcp;
NDPI_LOG_DBG(ndpi_struct, "search MGCP\n");
do {
if (packet->payload_packet_len < 8) break;
/* packet must end with 0x0d0a or with 0x0a */
if (packet->payload[packet->payload_packet_len - 1] != 0x0a &&
packet->payload[packet->payload_packet_len - 1] != 0x0d)
break;
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')
break;
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)
break;
endpoint = ndpi_strnstr((char const *)packet->payload + 5, " ", packet->payload_packet_len - 5);
if (endpoint == NULL)
{
break;
}
endpoint++;
mgcp = ndpi_strnstr(endpoint, " ", packet->payload_packet_len - ((u_int8_t const *)endpoint - packet->payload));
if (mgcp == NULL)
{
break;
}
mgcp++;
if (strncmp(mgcp, "MGCP ", ndpi_min(5, packet->payload_packet_len - ((u_int8_t const *)mgcp - packet->payload))) == 0)
{
ndpi_int_mgcp_add_connection(ndpi_struct, flow);
endpoint_hostname = ndpi_strnstr(endpoint, "@", packet->payload_packet_len - ((u_int8_t const *)endpoint - packet->payload));
if (endpoint_hostname == NULL || endpoint_hostname >= mgcp)
{
ndpi_hostname_sni_set(flow, (u_int8_t const *)endpoint, (mgcp - endpoint) - 1, NDPI_HOSTNAME_NORM_ALL);
} else {
endpoint_hostname++;
ndpi_hostname_sni_set(flow, (u_int8_t const *)endpoint_hostname, (mgcp - endpoint_hostname) - 1, NDPI_HOSTNAME_NORM_ALL);
}
return;
}
} while(0);
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_mgcp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("MGCP", ndpi_struct, *id,
NDPI_PROTOCOL_MGCP,
ndpi_search_mgcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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