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/*
* checkmk.c
*
* Copyright (C) 2011-22 - ntop.org
*
* 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_CHECKMK
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_checkmk_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CHECKMK, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_checkmk(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 Checkmk\n");
if (packet->payload_packet_len >= 15) {
if(packet->payload_packet_len > 128) {
/*
When we transfer a large data chunk, unless we have observed
the initial connection, we need to discard these packets
as they are not an indication that this flow is not AFP
*/
if(flow->packet_counter > 6)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
/*
* this will detect the OpenSession command of the Data Stream Interface (DSI) protocol
* which is exclusively used by the Apple Filing Protocol (AFP) on TCP/IP networks
*/
if (packet->payload_packet_len < 100
&& memcmp(packet->payload, "<<<check_mk>>>", 14) == 0) {
NDPI_LOG_DBG(ndpi_struct, "Check_MK: Flow detected.\n");
ndpi_int_checkmk_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_LOG_DBG(ndpi_struct, "Check_MK excluded.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_CHECKMK);
}
void init_checkmk_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("CHECKMK", ndpi_struct, *id,
NDPI_PROTOCOL_CHECKMK,
ndpi_search_checkmk,
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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