119 lines
3.1 KiB
C++
119 lines
3.1 KiB
C++
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/*
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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_old_steam(lpi_data_t *data) {
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/* Steam TCP Download */
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if (!match_str_either(data, "\x01\x00\x00\x00"))
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return false;
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if (!match_chars_either(data, 0x00, 0x00, 0x00, ANY))
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return false;
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if (data->payload_len[0] == 4 && data->payload_len[1] == 1) {
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return true;
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}
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if (data->payload_len[0] == 4 && data->payload_len[1] == 5) {
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return true;
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}
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if (data->payload_len[1] == 4 && data->payload_len[0] == 1) {
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return true;
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}
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if (data->payload_len[1] == 4 && data->payload_len[0] == 5) {
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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_steam_len(uint32_t payload, uint32_t len) {
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/* length is stored as a little-endian integer */
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#if BYTE_ORDER == BIG_ENDIAN
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uint32_t plen = bswap32(payload);
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#else
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uint32_t plen = payload;
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#endif
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if (plen == len - 8) {
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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_steam_vt01(lpi_data_t *data) {
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/* I imagine other ports are possible? */
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if (data->server_port != 27050 && data->client_port != 27050) {
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return false;
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}
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/* Observed length pairs so far:
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* 150, 76
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*/
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if (match_steam_len(data->payload[0], data->payload_len[0])) {
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if (match_steam_len(data->payload[1], data->payload_len[1])) {
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return true;
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}
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}
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return false;
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}
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static inline bool match_steam(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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if (match_old_steam(data))
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return true;
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if (match_steam_vt01(data)) {
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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 = {
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LPI_PROTO_STEAM,
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LPI_CATEGORY_GAMING,
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"Steam_TCP",
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104, /* Might not be as reliable as some other rules (?) */
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match_steam
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};
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void register_steam(LPIModuleMap *mod_map) {
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register_protocol(&lpi_steam, mod_map);
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}
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