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/*
* dlep.c
*
* Dynamic Link Exchange Protocol
*
* Copyright (C) 2024 - ntop.org
* Copyright (C) 2024 - 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_DLEP
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_dlep_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found DLEP\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_DLEP, NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_dlep(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 DLEP\n");
if (packet->udp != NULL && packet->payload_packet_len > 27) {
if ((memcmp(packet->payload, "DLEP", 4) == 0)) {
ndpi_int_dlep_add_connection(ndpi_struct, flow);
return;
}
} else if (packet->tcp != NULL) {
/* Maybe it's unnecessary, but it'll definitely eliminate any false positives.
* 854 port is IANA registered for DLEP. */
if (packet->payload_packet_len > 8 &&
(ntohs(packet->tcp->dest) == 854 || ntohs(packet->tcp->source) == 854))
{
if (ntohs(get_u_int16_t(packet->payload, 0)) < 0x11 &&
ntohs(get_u_int16_t(packet->payload, 2)) == (u_int16_t)(packet->payload_packet_len-4))
{
ndpi_int_dlep_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_dlep_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("DLEP", ndpi_struct, *id,
NDPI_PROTOCOL_DLEP,
ndpi_search_dlep,
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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