95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
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/*
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*
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* Copyright (c) 2011-2016 The University of Waikato, Hamilton, New Zealand.
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* All rights reserved.
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*
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* This file is part of libprotoident.
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*
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* This code has been developed by the University of Waikato WAND
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* research group. For further information please see http://www.wand.net.nz/
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*
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* libprotoident is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* libprotoident is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#include <string.h>
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#include "libprotoident.h"
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#include "proto_manager.h"
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#include "proto_common.h"
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static inline bool match_fbturn_request(uint32_t payload, uint32_t len) {
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/* 0x74 == len - 2, 0x0001 == binding request */
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if (len == 118 && MATCH(payload, 0x00, 0x74, 0x00, 0x01))
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return true;
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if (len == 114 && MATCH(payload, 0x00, 0x70, 0x00, 0x01))
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return true;
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if (len == 110 && MATCH(payload, 0x00, 0x6c, 0x00, 0x01))
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return true;
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if (len == 122 && MATCH(payload, 0x00, 0x78, 0x00, 0x01))
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return true;
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if (len == 126 && MATCH(payload, 0x00, 0x7c, 0x00, 0x01))
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return true;
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return false;
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}
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static inline bool match_fbturn_reply(uint32_t payload, uint32_t len) {
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/* 0x40 == len - 2, 0x0101 == binding accepted */
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if (len == 66 && MATCH(payload, 0x00, 0x40, 0x01, 0x01))
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return true;
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if (len == 82 && MATCH(payload, 0x00, 0x50, 0x01, 0x01))
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return true;
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return false;
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}
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static inline bool match_facebook_turn(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* Seems to be a slightly custom version of TURN, as there is a two
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* byte length field preceding the conventional STUN header. Can't
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* find any explanation for this in RFC 5766, so maybe it is a Facebook
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* addition?
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*/
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if (data->server_port != 443 && data->client_port != 443)
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return false;
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if (match_fbturn_request(data->payload[0], data->payload_len[0])) {
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if (match_fbturn_reply(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_fbturn_request(data->payload[1], data->payload_len[1])) {
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if (match_fbturn_reply(data->payload[0], data->payload_len[0]))
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return true;
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}
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return false;
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}
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static lpi_module_t lpi_facebook_turn = {
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LPI_PROTO_FACEBOOK_TURN,
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LPI_CATEGORY_NAT,
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"FacebookTURN",
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55,
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match_facebook_turn
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};
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void register_facebook_turn(LPIModuleMap *mod_map) {
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register_protocol(&lpi_facebook_turn, mod_map);
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}
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