105 lines
3.2 KiB
C++
105 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 bool is_kad_e9_payload(uint32_t payload, uint32_t len) {
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/* This seem to be some variant of Kademlia, although I have not
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* been able to figure out which */
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/* All packets begin with e9, while possible second bytes are
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* 0x55, 0x56, 0x60, 0x61, 0x76, 0x75
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*
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* 0x56 is a response to 0x55
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* 0x61 is a response to 0x60
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* 0x76 is a kind of FIN packet, it also responds to 0x75
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*
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* 0x92 seems to be a valid response to unsolicited 0x56 or 0x61 ??
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*
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* There are also packets that seem to begin with 0xea 0x75 0x78 0x9c.
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*/
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if (MATCH(payload, 0xe9, 0x55, ANY, ANY) && len == 27)
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return true;
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if (MATCH(payload, 0xe9, 0x56, ANY, ANY) && len == 27)
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return true;
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if (MATCH(payload, 0xe9, 0x60, ANY, ANY) && len == 34)
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return true;
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if (MATCH(payload, 0xe9, 0x61, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe9, 0x76, ANY, ANY) && len == 18)
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return true;
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if (MATCH(payload, 0xe9, 0x75, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe9, 0x92, ANY, ANY) && len == 3)
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return true;
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if (MATCH(payload, 0xea, 0x75, 0x78, 0x9c))
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return true;
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return false;
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}
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static inline bool match_kademlia(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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if (data->payload_len[0] == 0 && is_kad_e9_payload(data->payload[1],
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data->payload_len[1]))
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return true;
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if (data->payload_len[1] == 0 && is_kad_e9_payload(data->payload[0],
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data->payload_len[0]))
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return true;
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if (is_kad_e9_payload(data->payload[0], data->payload_len[0]) &&
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is_kad_e9_payload(data->payload[1],
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data->payload_len[1]))
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return true;
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return false;
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}
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static lpi_module_t lpi_kademlia = {
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LPI_PROTO_UDP_KADEMLIA,
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LPI_CATEGORY_P2P,
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"Kademlia",
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11,
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match_kademlia
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};
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void register_kademlia(LPIModuleMap *mod_map) {
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register_protocol(&lpi_kademlia, mod_map);
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}
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