85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
/*
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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_um(uint32_t payload, uint32_t len) {
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/* First two bytes are a length field */
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uint32_t hlen = ntohl(payload) >> 16;
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if (hlen == len - 2) {
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if (MATCH(payload, ANY, ANY, 'U', 'M'))
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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 inline bool match_2byte_reply(uint32_t payload, uint32_t len) {
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if (len == 2 && MATCH(payload, 0x00, 0x0e, 0x00, 0x00))
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return true;
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return false;
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}
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static inline bool match_vpnrobot_tcp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* Don't have any examples of a successful connection to a VPN
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* server yet, which may look a little different */
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/* Commonly seen on ports 66 and 119 */
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if (match_um(data->payload[0], data->payload_len[0])) {
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if (match_2byte_reply(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_um(data->payload[1], data->payload_len[1])) {
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if (match_2byte_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_vpnrobot_tcp = {
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LPI_PROTO_VPNROBOT,
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LPI_CATEGORY_TUNNELLING,
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"VPNRobot",
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55,
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match_vpnrobot_tcp
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};
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void register_vpnrobot_tcp(LPIModuleMap *mod_map) {
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register_protocol(&lpi_vpnrobot_tcp, mod_map);
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}
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