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/*
* profinet_io.c
*
* 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_PROFINET_IO
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_profinet_io_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found PROFINET/IO\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_PROFINET_IO, NDPI_PROTOCOL_DCERPC,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_profinet_io(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, "searching PROFINET/IO\n");
/* PROFINET/IO is based on connectionless DCE/RPC */
if ((flow->detected_protocol_stack[0] == NDPI_PROTOCOL_DCERPC) &&
(packet->payload_packet_len > 43))
{
u_int8_t byte_order = (packet->payload[4] >> 4) & 0xF;
u_int32_t time_low = 0;
u_int16_t time_mid = 0;
u_int16_t time_hi_and_version = 0;
if (byte_order == 0) { /* Big Endian */
time_low = ntohl(get_u_int32_t(packet->payload, 8));
time_mid = ntohs(get_u_int16_t(packet->payload, 12));
time_hi_and_version = ntohs(get_u_int16_t(packet->payload, 14));
} else { /* Little Endian */
time_low = le32toh(get_u_int32_t(packet->payload, 8));
time_mid = le16toh(get_u_int16_t(packet->payload, 12));
time_hi_and_version = le16toh(get_u_int16_t(packet->payload, 14));
}
if ((time_low == 0xDEA00000) && (time_mid == 0x6C97) &&
(time_hi_and_version == 0x11D1))
{
ndpi_int_profinet_io_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_profinet_io_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("PROFINET_IO", ndpi_struct, *id,
NDPI_PROTOCOL_PROFINET_IO,
ndpi_search_profinet_io,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK
);
*id += 1;
}
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