189 lines
6.5 KiB
C++
189 lines
6.5 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 xunlei_32(uint32_t payload, uint32_t len) {
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if (len == 0)
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return true;
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if (!MATCH(payload, 0x32, 0x00, 0x00, 0x00))
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return false;
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if (len == 29)
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return true;
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if (len == 31)
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return true;
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return false;
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}
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static inline bool match_shuijing_3b_other(uint32_t payload, uint32_t len) {
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if (!MATCH(payload, 0x3b, 0x00, 0x00, 0x00))
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return false;
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if (len == 31 || len == 29 || len == 42)
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return true;
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return false;
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}
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static inline bool match_shuijing_32(uint32_t payload, uint32_t len) {
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if (len == 31 && MATCH(payload, 0x32, 0x00, 0x00, 0x00))
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return true;
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if (len == 29 && MATCH(payload, 0x32, 0x00, 0x00, 0x00))
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return true;
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if (len == 42 && MATCH(payload, 0x32, 0x00, 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_shuijing_3b(uint32_t payload, uint32_t len) {
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if (len == 33 && MATCH(payload, 0x3b, 0x00, 0x00, 0x00))
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return true;
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if (len == 31 && MATCH(payload, 0x3b, 0x00, 0x00, 0x00))
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return true;
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if (len == 29 && MATCH(payload, 0x3b, 0x00, 0x00, 0x00))
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return true;
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if (len == 13 && MATCH(payload, 0x3b, 0x00, 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_xunlei_udp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* Shuijing = "Thunder Crystal", a P2P CDN approach used by Xunlei.
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* Uses UDP port 4693 normally */
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if (match_shuijing_3b(data->payload[0], data->payload_len[0])) {
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if (match_shuijing_3b_other(data->payload[1], data->payload_len[1]))
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return true;
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if (match_shuijing_32(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_shuijing_3b(data->payload[1], data->payload_len[1])) {
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if (match_shuijing_3b_other(data->payload[0], data->payload_len[0]))
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return true;
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if (match_shuijing_32(data->payload[0], data->payload_len[0]))
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return true;
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}
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/* Traffic seen while operating the Thunder client, not sure on exact
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* purpose but can lead to large flows. Rule is not very strong, since
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* the payload seems random.
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*/
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if (data->server_port == 12345 || data->client_port == 12345) {
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if (data->payload[0] != 0 && data->payload[1] != 0) {
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if (data->payload_len[0] >= 39) {
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if (data->payload_len[0] <= 43) {
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if (data->payload_len[1] >= 39) {
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if (data->payload_len[1] <= 43)
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return true;
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}
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}
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}
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}
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}
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if (match_str_both(data, "\x32\x00\x00\x00", "\x32\x00\x00\x00"))
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return true;
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if (match_str_both(data, "\x36\x00\x00\x00", "\x36\x00\x00\x00"))
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return true;
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if (match_str_both(data, "\x35\x00\x00\x00", "\x35\x00\x00\x00"))
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return true;
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if (match_str_both(data, "\x35\x00\x00\x00", "\x28\x00\x00\x00"))
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return true;
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if (match_str_both(data, "\x35\x00\x00\x00", "\x29\x00\x00\x00"))
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return true;
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if (match_str_both(data, "\x34\x00\x00\x00", "\x34\x00\x00\x00"))
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return true;
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if (match_str_both(data, "\x34\x00\x00\x00", "\x29\x00\x00\x00"))
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return true;
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if (match_str_both(data, "\x33\x00\x00\x00", "\x33\x00\x00\x00"))
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return true;
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if (xunlei_32(data->payload[0], data->payload_len[0])) {
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if (xunlei_32(data->payload[1], data->payload_len[1]))
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return true;
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}
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/* Require port 3076 for now, as all these rules are based on
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* traffic seen on port 3076 */
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if (data->server_port != 3076 && data->client_port != 3076)
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return false;
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if (match_str_either(data, "\x36\x00\x00\x00")) {
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if (data->payload_len[0] == 0)
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return true;
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if (data->payload_len[1] == 0)
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return true;
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}
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if (match_str_either(data, "\x35\x00\x00\x00")) {
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if (data->payload_len[0] == 0)
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return true;
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if (data->payload_len[1] == 0)
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return true;
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}
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if (match_str_either(data, "\x34\x00\x00\x00")) {
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if (data->payload_len[0] == 0)
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return true;
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if (data->payload_len[1] == 0)
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return true;
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}
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if (match_str_either(data, "\x33\x00\x00\x00")) {
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if (data->payload_len[0] == 0)
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return true;
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if (data->payload_len[1] == 0)
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return true;
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}
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if (match_str_either(data, "\x29\x00\x00\x00")) {
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if (data->payload_len[0] == 0)
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return true;
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if (data->payload_len[1] == 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_udp = {
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LPI_PROTO_UDP_XUNLEI,
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LPI_CATEGORY_P2P,
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"Xunlei_UDP",
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203,
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match_xunlei_udp
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};
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void register_xunlei_udp(LPIModuleMap *mod_map) {
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register_protocol(&lpi_xunlei_udp, mod_map);
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}
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