119 lines
3.2 KiB
C++
119 lines
3.2 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_39_request(uint32_t payload, uint32_t len) {
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if (len != 4)
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return false;
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if (!MATCH(payload, 0x39, 0x18, 0x00, 0x00))
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return false;
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return true;
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}
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static inline bool match_3a_response(uint32_t payload, uint32_t len) {
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if (len == 0)
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return true;
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if (len != 8)
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return false;
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if (!MATCH(payload, 0x3a, 0x18, 0x00, 0x00))
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return false;
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return true;
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}
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static inline bool match_steam_udp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* Master Server Queries begin with 31 ff 30 2e
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*
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* NOTE: the ff byte can vary depending on the region that the user
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* is querying for, but ff is the "all regions" option and is the
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* typical default.
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*/
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if (match_str_either(data, "\x31\xff\x30\x2e")
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&& match_str_either(data, "\xff\xff\xff\xff")) {
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return true;
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}
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/* Server Info queries are always 53 bytes and begin with ff ff ff ff.
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* The reply also begins with ff ff ff ff but can vary in size */
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if (MATCHSTR(data->payload[0], "\xff\xff\xff\xff") &&
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data->payload_len[0] == 25 &&
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(MATCHSTR(data->payload[1], "\xff\xff\xff\xff") ||
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data->payload_len[1] == 0)) {
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return true;
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}
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if (MATCHSTR(data->payload[1], "\xff\xff\xff\xff") &&
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data->payload_len[1] == 25 &&
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(MATCHSTR(data->payload[0], "\xff\xff\xff\xff") ||
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data->payload_len[0] == 0)) {
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return true;
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}
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/* This stuff is definitely related to Steam or some game played
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* over Steam - need to look into this more at some point */
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if (match_39_request(data->payload[0], data->payload_len[0])) {
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if (match_3a_response(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_39_request(data->payload[1], data->payload_len[1])) {
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if (match_3a_response(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_steam_udp = {
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LPI_PROTO_UDP_STEAM,
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LPI_CATEGORY_GAMING,
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"Steam_UDP",
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4,
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match_steam_udp
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};
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void register_steam_udp(LPIModuleMap *mod_map) {
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register_protocol(&lpi_steam_udp, mod_map);
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}
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