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/*
* hart-ip.c
*
* Highway Addressable Remote Transducer over IP
*
* Copyright (C) 2023 - ntop.org
* Copyright (C) 2023 - V.G <v.gavrilov@securitycode.ru>
*
* 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_HART_IP
#include "ndpi_api.h"
#include "ndpi_private.h"
struct hart_ip_hdr {
u_int8_t version;
u_int8_t msg_type;
u_int8_t msg_id;
u_int8_t status;
u_int16_t seq_num;
u_int16_t msg_len;
};
enum hart_ip_msg_type {
REQUEST_MSG,
RESPONSE_MSG,
PUBLISH_MSG,
NAK_MSG = 15
};
enum hart_ip_msg_id {
SESSION_INITIATE_ID,
SESSION_CLOSE_ID,
KEEPALIVE_ID,
TOKEN_PASSING_PDU_ID,
DIRECT_PDU_ID,
READ_AUDIT_LOG_ID
};
static void ndpi_int_hart_ip_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found HART-IP\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_HART_IP, NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_hart_ip(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search HART-IP\n");
if (packet->payload_packet_len < sizeof(struct hart_ip_hdr)) {
goto not_hart_ip;
}
struct hart_ip_hdr const * const hart_ip_header = (struct hart_ip_hdr *)packet->payload;
if (hart_ip_header->version == 1 || hart_ip_header->version == 2) {
u_int8_t message_type = hart_ip_header->msg_type & 0xF;
if ((message_type > PUBLISH_MSG && message_type != NAK_MSG) &&
hart_ip_header->msg_id > READ_AUDIT_LOG_ID)
{
goto not_hart_ip;
}
if (ntohs(hart_ip_header->msg_len) != packet->payload_packet_len) {
goto not_hart_ip;
}
ndpi_int_hart_ip_add_connection(ndpi_struct, flow);
return;
}
not_hart_ip:
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_hart_ip_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("HART-IP", ndpi_struct, *id,
NDPI_PROTOCOL_HART_IP,
ndpi_search_hart_ip,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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