102 lines
3.1 KiB
C++
102 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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/* Mongo protocol uses the first four bytes as a length field */
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static inline bool match_mongo_req(uint32_t payload, uint32_t len) {
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uint32_t mongolen = bswap_le_to_host32(payload);
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/* Most requests are very small */
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if (MATCH(payload, ANY, 0x00, 0x00, 0x00) ||
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MATCH(payload, ANY, 0x01, 0x00, 0x00)) {
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/* Some mongo libraries manage to split requests across
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* multiple packets, so we can't do a direct length
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* match :(
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*/
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if (mongolen >= len)
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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_mongo_reply(uint32_t payload, uint32_t len) {
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uint32_t mongolen = bswap_le_to_host32(payload);
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/* If reply is short, mongolen should match the packet length */
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if (mongolen == len)
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return true;
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/* If mongolen is large, packet len should be MTU-sized. Here,
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* we'll assume an MTU of at least 1400 (sorry, people with
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* tons of encapsulation) */
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if (mongolen > len) {
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if (len >= 1400)
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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_mongo(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* Restrict to the default mongo port for now */
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if (data->server_port != 27017 && data->client_port != 27017)
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return false;
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if (match_mongo_req(data->payload[0], data->payload_len[0])) {
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if (match_mongo_reply(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_mongo_req(data->payload[1], data->payload_len[1])) {
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if (match_mongo_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_mongo = {
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LPI_PROTO_MONGO,
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LPI_CATEGORY_DATABASES,
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"MongoDB",
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88,
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match_mongo
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};
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void register_mongo(LPIModuleMap *mod_map) {
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register_protocol(&lpi_mongo, mod_map);
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}
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