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/*
* iec60870-5-104.c
* Extension for industrial 104 protocol recognition
*
* Copyright (C) 2019-22 - 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_IEC60870
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_search_iec60870_tcp(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
/* Check connection over TCP */
NDPI_LOG_DBG(ndpi_struct, "search IEC60870\n");
if(packet->tcp) {
u_int16_t offset = 0, found = 0;
while(offset + 1 < packet->payload_packet_len) {
/* The start byte of 104 is 0x68 */
if(packet->payload[offset] == 0x68) {
u_int8_t len = packet->payload[offset+1];
if(len == 0)
break;
else {
u_int8_t len = packet->payload[offset+1];
if((len + offset + 2) == packet->payload_packet_len) {
found = 1;
break;
}
offset += len + 2;
}
} else
break;
}
if(found) {
NDPI_LOG_INFO(ndpi_struct, "Found IEC60870-104\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_IEC60870, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_104_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id) {
ndpi_set_bitmask_protocol_detection("IEC60870", ndpi_struct, *id,
NDPI_PROTOCOL_IEC60870,
ndpi_search_iec60870_tcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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