/*
 *
 * 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_hangout_req(uint32_t payload, uint32_t len) {

        if ((len % 114) == 0) {
                if (MATCH(payload, 0x00, 0x70, 0x00, 0x01))
                        return true;
        }

        if ((len % 122) == 0) {
                if (MATCH(payload, 0x00, 0x78, 0x00, 0x01))
                        return true;
        }

        if (len == 110 && MATCH(payload, 0x00, 0x6c, 0x00, 0x01))
                return true;

        return false;
}

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

        if (len == 106) {
                if (MATCH(payload, 0x00, 0x68, 0x01, 0x01))
                        return true;
        }

        if (len == 118) {
                if (MATCH(payload, 0x00, 0x74, 0x01, 0x01))
                        return true;
        }

        if (len == 94 && MATCH(payload, 0x00, 0x5c, 0x01, 0x01))
                return true;

        return false;
}


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

        /* Based on traffic seen on port 19305 to google addresses */

        /* Limit this to port 19305 - 19309 */
        if (data->server_port < 19305 || data->server_port > 19309) {
                if (data->client_port < 19305 || data->client_port > 19309)
                        return false;
        }

        if (match_hangout_req(data->payload[0], data->payload_len[0])) {
                if (match_hangout_resp(data->payload[1], data->payload_len[1]))
                        return true;
        }

        if (match_hangout_req(data->payload[1], data->payload_len[1])) {
                if (match_hangout_resp(data->payload[0], data->payload_len[0]))
                        return true;
        }


	return false;
}

static lpi_module_t lpi_googlehangouts = {
	LPI_PROTO_GOOGLE_HANGOUTS,
	LPI_CATEGORY_CHAT,
	"GoogleHangouts",
	12,
	match_googlehangouts
};

void register_googlehangouts(LPIModuleMap *mod_map) {
	register_protocol(&lpi_googlehangouts, mod_map);
}