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/*
* imo.c
*
* Copyright (C) 2019-24 - 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_IMO
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_imo_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_IMO, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_imo(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search IMO\n");
if(packet->payload_packet_len == 1) {
/* Two one byte consecutive packets with the same payload */
if((flow->l4.udp.imo_last_one_byte_pkt == 1)
&& (flow->l4.udp.imo_last_byte == packet->payload[0]))
ndpi_int_imo_add_connection(ndpi_struct, flow);
else
flow->l4.udp.imo_last_one_byte_pkt = 1, flow->l4.udp.imo_last_byte = packet->payload[0];
} else if(((packet->payload_packet_len == 10)
&& (packet->payload[0] == 0x09)
&& (packet->payload[1] == 0x02))
|| ((packet->payload_packet_len == 11)
&& (packet->payload[0] == 0x00)
&& (packet->payload[1] == 0x09)
&& (packet->payload[2] == 0x03))
|| ((packet->payload_packet_len == 1099)
&& (packet->payload[0] == 0x88)
&& (packet->payload[1] == 0x49)
&& (packet->payload[2] == 0x1a)
&& (packet->payload[3] == 0x00))) {
NDPI_LOG_INFO(ndpi_struct, "found IMO\n");
ndpi_int_imo_add_connection(ndpi_struct, flow);
} else {
if(flow->num_processed_pkts > 5)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
else
flow->l4.udp.imo_last_one_byte_pkt = 0;
}
}
void init_imo_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id) {
ndpi_set_bitmask_protocol_detection("IMO", ndpi_struct, *id,
NDPI_PROTOCOL_IMO,
ndpi_search_imo,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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