242 lines
7.2 KiB
C++
242 lines
7.2 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_emule_kad(uint32_t payload, uint32_t len) {
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/* Many of these can be tracked back to
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* http://easymule.googlecode.com/svn/trunk/src/WorkLayer/opcodes.h
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*
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* XXX Some of these are request/response pairs that we may need to
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* match together if we start getting false positives
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*/
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/* Bootstrap version 2 request and response */
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if (MATCH(payload, 0xe4, 0x00, ANY, ANY) && len == 27)
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return true;
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if (MATCH(payload, 0xe4, 0x08, ANY, ANY) && len == 529)
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return true;
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/* Bootstrap version 2 request and response */
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if (MATCH(payload, 0xe4, 0x01, 0x00, 0x00) && (
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len == 2 || len == 18))
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return true;
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if (MATCH(payload, 0xe4, 0x09, ANY, ANY) && len == 523)
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return true;
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if (MATCH(payload, 0xe4, 0x21, ANY, ANY) && len == 35)
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return true;
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if (MATCH(payload, 0xe4, 0x4b, ANY, ANY) && len == 19)
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return true;
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if (MATCH(payload, 0xe4, 0x11, ANY, ANY)) {
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return true;
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}
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if (MATCH(payload, 0xe4, 0x19, ANY, ANY)) {
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if (len == 22 || len == 38 || len == 28)
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return true;
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}
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if (MATCH(payload, 0xe4, 0x20, ANY, ANY) && len == 35)
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return true;
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if (MATCH(payload, 0xe4, 0x18, ANY, ANY) && len == 27)
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return true;
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if (MATCH(payload, 0xe4, 0x10, ANY, ANY) && len == 27)
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return true;
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if (MATCH(payload, 0xe4, 0x58, ANY, ANY) && len == 6)
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return true;
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if (MATCH(payload, 0xe4, 0x50, ANY, ANY) && len == 4)
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return true;
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if (MATCH(payload, 0xe4, 0x52, ANY, ANY) && len == 36)
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return true;
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if (MATCH(payload, 0xe4, 0x40, ANY, ANY) && len == 48)
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return true;
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if (MATCH(payload, 0xe4, 0x43, ANY, ANY) && len == 225)
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return true;
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if (MATCH(payload, 0xe4, 0x48, ANY, ANY) && len == 19)
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return true;
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if (MATCH(payload, 0xe4, 0x29, ANY, ANY)) {
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if (len == 119 || len == 69 || len == 294)
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return true;
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}
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if (MATCH(payload, 0xe4, 0x28, ANY, ANY)) {
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if (len == 119 || len == 69 || len == 294)
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return true;
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if (len == 44)
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return true;
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if (len == 269)
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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 bool is_emule_udp(uint32_t payload, uint32_t len) {
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/* Mainly looking at Kad stuff here - Kad packets start with 0xe4
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* for uncompressed and 0xe5 for compressed data */
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if (MATCH(payload, 0xe5, 0x43, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe5, 0x08, 0x78, 0xda))
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return true;
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if (MATCH(payload, 0xe5, 0x28, 0x78, 0xda))
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return true;
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/* emule extensions */
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if (MATCH(payload, 0xc5, 0x90, ANY, ANY)) {
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return true;
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}
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if (MATCH(payload, 0xc5, 0x91, ANY, ANY)) {
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return true;
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}
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if (MATCH(payload, 0xc5, 0x92, ANY, ANY) && (len == 2))
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return true;
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if (MATCH(payload, 0xc5, 0x93, ANY, ANY) && (len == 2))
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return true;
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if (MATCH(payload, 0xc5, 0x94, ANY, ANY)) {
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if (len >= 38 && len <= 70)
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return true;
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}
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/* 0xe3 covers conventional emule messages */
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if (MATCH(payload, 0xe3, 0x9a, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe3, 0x9b, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe3, 0x96, ANY, ANY) && len == 6)
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return true;
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if (MATCH(payload, 0xe3, 0x97, ANY, ANY)) {
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if (len <= 34 && ((len - 2) % 4 == 0))
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return true;
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}
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if (MATCH(payload, 0xe3, 0x92, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe3, 0x94, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe3, 0x98, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe3, 0x99, ANY, ANY))
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return true;
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if (MATCH(payload, 0xe3, 0xa2, ANY, ANY) && len == 6)
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return true;
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if (MATCH(payload, 0xe3, 0xa3, ANY, ANY))
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return true;
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if (match_emule_kad(payload, len))
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return true;
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return false;
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}
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static inline bool match_emule_verycd(uint32_t payload, uint32_t len) {
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/* Later packets in the flow are clearly referencing eMule builds
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* and software, in particular VeryCD and xl build61 */
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if (len != 31)
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return false;
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if (!MATCH(payload, 0x3b, 0x00, 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_emule_udp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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if (match_emule(data))
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return true;
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if (data->payload_len[0] == 0 &&
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is_emule_udp(data->payload[1], data->payload_len[1])) {
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return true;
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}
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if (data->payload_len[1] == 0 &&
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is_emule_udp(data->payload[0], data->payload_len[0])) {
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return true;
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}
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if (is_emule_udp(data->payload[0], data->payload_len[0]) &&
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is_emule_udp(data->payload[1], data->payload_len[1]))
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return true;
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/* Having doubts about the correctness of this rule, so disabling
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* for now. */
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/*
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if (match_emule_verycd(data->payload[0], data->payload_len[0])) {
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if (data->payload_len[1] != 0)
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return true;
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}
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if (match_emule_verycd(data->payload[1], data->payload_len[1])) {
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if (data->payload_len[0] != 0)
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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 lpi_module_t lpi_emule_udp = {
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LPI_PROTO_UDP_EMULE,
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LPI_CATEGORY_P2P,
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"eMule_UDP",
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11,
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match_emule_udp
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};
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void register_emule_udp(LPIModuleMap *mod_map) {
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register_protocol(&lpi_emule_udp, mod_map);
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}
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