/*
 *
 * Copyright (c) 2011-2016 The University of Waikato, Hamilton, New Zealand.
 * All rights reserved.
 *
 * This file is part of libprotoident.
 *
 * This code has been developed by the University of Waikato WAND
 * research group. For further information please see http://www.wand.net.nz/
 *
 * libprotoident 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.
 *
 * libprotoident 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */

#include <string.h>

#include "libprotoident.h"
#include "proto_manager.h"
#include "proto_common.h"

static inline bool match_ts3_req(uint32_t payload, uint32_t len) {

        if (MATCH(payload, 'T', 'S', '3', 'I'))
                return true;

        return false;
}

static inline bool match_ts3_resp(uint32_t payload, uint32_t len,
                uint16_t porta, uint16_t portb) {
        if (len == 0)
                return true;

        if (MATCH(payload, 'T', 'S', '3', 'I'))
                return true;

        /* Seem to get some encrypted responses, but the only ones I've 
         * seen so far are either 181 or 182 bytes. Enforce the expected
         * TeamSpeak port in this case, just to be safe.
         */
        if ((len >= 180 && len <= 182) && (porta == 9987 || portb == 9987))
                return true;

        return false;
}

static inline bool match_teamspeak(lpi_data_t *data, lpi_module_t *mod UNUSED) {

	/* Teamspeak version 2 */
        if (match_str_both(data, "\xf4\xbe\x03\x00", "\xf4\xbe\x03\x00"))
                return true;
        /* Teamspeak version 3 */
        if (match_ts3_req(data->payload[0], data->payload_len[0])) {
                if (match_ts3_resp(data->payload[1], data->payload_len[1],
                                data->server_port, data->client_port))
                        return true;
        }

        if (match_ts3_req(data->payload[1], data->payload_len[1])) {
                if (match_ts3_resp(data->payload[0], data->payload_len[0],
                                data->server_port, data->client_port))
                        return true;
        }

	/* Not sure what this is, but it goes to a teamspeak.org server */
	if (match_str_either(data, "\x07Pri"))
		return true;

	return false;
}

static lpi_module_t lpi_teamspeak = {
	LPI_PROTO_UDP_TEAMSPEAK,
	LPI_CATEGORY_VOIP,
	"TeamSpeak",
	3,
	match_teamspeak
};

void register_teamspeak(LPIModuleMap *mod_map) {
	register_protocol(&lpi_teamspeak, mod_map);
}