110 lines
3.1 KiB
C++
110 lines
3.1 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 is a classic 4-byte length protocol, but there is plenty of
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* scope for the packet sizes to vary a bit so we can't just look for
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* a specific combo of packet sizes */
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static inline bool match_douyu_req(uint32_t payload, uint32_t len) {
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uint32_t plen = bswap_le_to_host32(payload);
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/* Packet usually contains a username and a password so
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* can probably vary quite a bit in size */
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if (plen == len - 4) {
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if (len <= 255)
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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_douyu_reply(uint32_t payload, uint32_t len) {
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uint32_t plen = bswap_le_to_host32(payload);
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/* Response packets seem like they will vary a lot less in
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* size -- could be wrong though */
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if (plen == len - 4) {
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if (len >= 225 && len <= 255)
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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_douyu_port(uint16_t port) {
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/* Based purely on observed flows, rather than any docs */
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if (port >= 8601 && port <= 8605)
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return true;
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if (port >= 12601 && port <= 12605)
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return true;
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return false;
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}
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static inline bool match_douyu(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* Tends to use a couple of different port ranges */
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if (!match_douyu_port(data->server_port) &&
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!match_douyu_port(data->client_port)) {
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return false;
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}
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if (match_douyu_req(data->payload[0], data->payload_len[0])) {
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if (match_douyu_reply(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_douyu_req(data->payload[1], data->payload_len[1])) {
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if (match_douyu_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_douyu = {
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LPI_PROTO_DOUYU,
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LPI_CATEGORY_STREAMING,
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"Douyu",
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249,
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match_douyu
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};
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void register_douyu(LPIModuleMap *mod_map) {
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register_protocol(&lpi_douyu, mod_map);
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}
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