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/*
* ieee-c37118.c
*
* IEEE C37.118 Synchrophasor Protocol
*
* Copyright (C) 2023 - ntop.org
* Copyright (C) 2023 - V.G <jacendi@protonmail.com>
*
* 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_IEEE_C37118
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_ieee_c37118_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found IEEE C37.118\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_IEEE_C37118, NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_ieee_c37118(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 IEEE C37.118\n");
/* A little bit of heuristics. Check the minimum length,
* version (0xAA) and frame type (0 to 5) */
if ((packet->payload_packet_len >= 17) && (packet->payload[0] == 0xAA) &&
((packet->payload[1] >> 4) < 6))
{
u_int16_t frame_size = ntohs(get_u_int16_t(packet->payload, 2));
u_int16_t crc = ntohs(get_u_int16_t(packet->payload, packet->payload_packet_len-2));
if ((frame_size == packet->payload_packet_len) &&
(crc == ndpi_crc16_ccit_false(packet->payload, packet->payload_packet_len-2)))
{
ndpi_int_ieee_c37118_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_ieee_c37118_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("IEEE-C37118", ndpi_struct, *id,
NDPI_PROTOCOL_IEEE_C37118,
ndpi_search_ieee_c37118,
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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