122 lines
3.7 KiB
C++
122 lines
3.7 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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/* This protocol is definitely tied up with Xunlei. It appears to only be
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* used when using the "accelerated" download option in the Thunder client.
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* Basically, the download will be accelerated by pulling parts of the content
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* from servers owned by Xunlei in addition to the standard P2P downloading
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* from other Xunlei users.
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*
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* Not 100% sure this should be a separate protocol, but the distinction
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* compared with the other Xunlei stuff is possibly interesting.
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*/
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/* NOTE: we see a lot of other xunlei traffic with a similar payload pattern
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* on other ports but the payload sizes don't match up so I suspect this is
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* 'other' thunder traffic of some sort.
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*/
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static inline bool match_xaccel_req(uint32_t payload, uint32_t len) {
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uint32_t byte4;
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/* Byte 4 must be either 0x4X or 0x5X */
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byte4 = (ntohl(payload) & 0xff);
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if (byte4 < 0x40 || byte4 > 0x5f)
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return false;
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/* Observed requests seem to fall in a very specific packet size
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* range (at least the stuff on port 8080 does)
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*/
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if (len >= 532 && len <= 542)
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return true;
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if (len >= 309 && len <= 312)
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return true;
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return false;
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}
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static inline bool match_xaccel_resp(uint32_t payload, uint32_t len) {
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uint32_t byte4;
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/* Byte 4 must be either 0x4X or 0x5X */
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byte4 = (ntohl(payload) & 0xff);
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if (byte4 < 0x40 || byte4 > 0x5f)
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return false;
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/* Observed requests seem to fall in a very specific packet size
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* range (at least the stuff on port 8080 does)
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*/
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if (len >= 104 && len <= 116)
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return true;
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return false;
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}
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static inline bool match_xunlei_accel(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* Tough to match reliably -- we don't have a lot to go on */
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/* The Xunlei-controlled servers all seem to listen on port 8080 */
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if (data->server_port != 8080 && data->client_port != 8080)
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return false;
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if (match_xaccel_req(data->payload[0], data->payload_len[0])) {
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if (match_xaccel_resp(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_xaccel_req(data->payload[1], data->payload_len[1])) {
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if (match_xaccel_resp(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_xunlei_accel = {
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LPI_PROTO_XUNLEI_ACCEL,
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LPI_CATEGORY_P2P,
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"XunleiAccelerated",
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240,
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match_xunlei_accel
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};
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void register_xunlei_accel(LPIModuleMap *mod_map) {
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register_protocol(&lpi_xunlei_accel, mod_map);
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}
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