/*
 * kontiki.c
 *
 * Copyright (C) 2009-2011 by ipoque GmbH
 * Copyright (C) 2011-19 - 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_KONTIKI

#include "ndpi_api.h"


static void ndpi_int_kontiki_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
					    struct ndpi_flow_struct *flow)
{
  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_KONTIKI, NDPI_PROTOCOL_UNKNOWN);
  NDPI_LOG_INFO(ndpi_struct, "found Kontiki UDP\n");
}

void ndpi_search_kontiki(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
	struct ndpi_packet_struct *packet = &flow->packet;
	
	NDPI_LOG_DBG(ndpi_struct, "search Kontiki\n");

	if (packet->payload_packet_len == 4 && (get_u_int32_t(packet->payload, 0) == htonl(0x02010100))) {
		ndpi_int_kontiki_add_connection(ndpi_struct, flow);
		return;
	}

	if (packet->payload_packet_len > 0 && packet->payload[0] == 0x02) {

		if (packet->payload_packet_len == 20 && (get_u_int32_t(packet->payload, 16) == htonl(0x02040100))) {
			ndpi_int_kontiki_add_connection(ndpi_struct, flow);
			return;
		}
		if (packet->payload_packet_len == 16 && (get_u_int32_t(packet->payload, 12) == htonl(0x000004e4))) {
			ndpi_int_kontiki_add_connection(ndpi_struct, flow);
			return;
		}
	}

	NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}


void init_kontiki_dissector(struct ndpi_detection_module_struct *ndpi_struct,
			    u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
  ndpi_set_bitmask_protocol_detection("Kontiki", ndpi_struct, detection_bitmask, *id,
				      NDPI_PROTOCOL_KONTIKI,
				      ndpi_search_kontiki,
				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
				      ADD_TO_DETECTION_BITMASK);

  *id += 1;
}