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/*
* dnp3.c
*
* Copyright (C) 2011-22 - ntop.org
*
* 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/>.
*
* Created by Cesar HM
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_DNP3
#include "ndpi_api.h"
/*
https://www.ixiacom.com/company/blog/scada-distributed-network-protocol-dnp3
*/
/* ******************************************************** */
void ndpi_search_dnp3_tcp(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 DNP3\n");
if(packet->tcp) {
/* The payload of DNP3 is 10 bytes long.
* Header bytes: 0x0564
*/
if ((packet->payload_packet_len >= 10)
&& (packet->payload[0] == 0x05)
&& (packet->payload[1] == 0x64)) {
NDPI_LOG_INFO(ndpi_struct, "found DNP3\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_DNP3, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
/* ******************************************************** */
void init_dnp3_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask) {
ndpi_set_bitmask_protocol_detection("DNP3", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_DNP3,
ndpi_search_dnp3_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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