105 lines
2.7 KiB
C++
105 lines
2.7 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_snmp_payload(uint32_t payload, uint32_t len) {
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/* SNMP is BER encoded, which is an ass to decode */
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uint8_t snmplen = 0;
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uint8_t *byte;
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if (len == 0)
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return true;
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/* Must be a SEQUENCE */
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if (!MATCH(payload, 0x30, ANY, ANY, ANY))
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return false;
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byte = ((uint8_t *)&payload) + 1;
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if (*byte< 0x80) {
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snmplen = *byte;
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if (!MATCH(payload, 0x30, ANY, 0x02, 0x01))
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return false;
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if (len - 2 != snmplen)
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return false;
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return true;
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}
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if (*byte == 0x81) {
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snmplen = *(byte + 1);
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if (!MATCH(payload, 0x30, 0x81, ANY, 0x02))
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return false;
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if (len - 3 != snmplen)
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return false;
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return true;
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}
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if (*byte == 0x82) {
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uint16_t longlen = *((uint16_t *)(byte + 1));
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if (len - 4 != ntohs(longlen))
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return false;
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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_snmp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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if (!match_snmp_payload(data->payload[0], data->payload_len[0]))
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return false;
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if (!match_snmp_payload(data->payload[1], data->payload_len[1]))
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return false;
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return true;
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}
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static lpi_module_t lpi_snmp = {
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LPI_PROTO_UDP_SNMP,
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LPI_CATEGORY_MONITORING,
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"SNMP",
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3,
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match_snmp
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};
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void register_snmp(LPIModuleMap *mod_map) {
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register_protocol(&lpi_snmp, mod_map);
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}
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