214 lines
6.2 KiB
C++
214 lines
6.2 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_mc_server_ping(uint32_t payload, uint32_t len) {
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/* There are two variants of the server ping
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*
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* http://mc.kev009.com/Server_List_Ping
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*/
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if (len == 1) {
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if (MATCH(payload, 0xfe, 0x00, 0x00, 0x00))
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return true;
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}
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if (len == 2) {
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if (MATCH(payload, 0xf3, 0x01, 0x00, 0x00))
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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_mc_kick(uint32_t payload, uint32_t len) {
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uint32_t str_len;
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if (!MATCH(payload, 0xff, ANY, ANY, 0x00))
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return false;
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/* Middle 2 bytes are the length of the string following the initial
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* header. Unfortunately there is more to the packet after the string,
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* so we just have to check that the length makes sense given the size
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* of the packet */
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str_len = (ntohl(payload) >> 8) & 0xffff;
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if (str_len >= len)
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return false;
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return true;
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}
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static inline bool match_mc_handshake(uint32_t payload, uint32_t len) {
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/* Ref: http://wiki.vg/Protocol */
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uint32_t replen;
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replen = ntohl(payload) >> 24;
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if (replen == len - 1) {
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if (MATCH(payload, ANY, 0x00, ANY, ANY) && len - 1 <= 255)
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return true;
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if (MATCH(payload, ANY, 0x01, ANY, ANY) && len - 1 >= 256)
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return true;
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}
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/* Some handshakes seem to be undersized? */
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if (len == 187 && MATCH(payload, 0xb9, 0x01, 0x01, 0x0e))
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return true;
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if (len == 188 && MATCH(payload, 0xba, 0x01, 0x01, 0x0f))
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return true;
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if (len == 189 && MATCH(payload, 0xbb, 0x01, 0x01, 0x10))
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return true;
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if (len == 190 && MATCH(payload, 0xbc, 0x01, 0x01, 0x11))
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return true;
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return false;
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}
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static inline bool match_mc_v5_handshake(uint32_t payload, uint32_t len) {
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uint32_t replen;
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uint32_t serverlen;
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replen = ntohl(payload) >> 24;
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serverlen = ntohl(payload) & 0xff;
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if (replen == len - 1 && len - 1 <= 255) {
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if (!MATCH(payload, ANY, 0x00, 0x05, ANY))
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return false;
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if (serverlen != replen - 6)
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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_mc_handshake_reply(uint32_t payload, uint32_t len) {
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/* Not technically a handshake reply, as the protocol spec doesn't
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* have one. This pattern is what we see in the other direction
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* after a handshake though.
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*/
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if (len == 173) {
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if (MATCH(payload, 0xab, 0x01, 0x01, 0x00))
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return true;
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}
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if (len == 174) {
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if (MATCH(payload, 0xac, 0x01, 0x01, 0x00))
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return true;
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}
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if (len == 22 && MATCH(payload, 0x15, 0x00, 0xd4, 0x02))
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return true;
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if (len == 24 && MATCH(payload, 0x17, 0x00, 0xcf, 0x02))
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return true;
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if (len == 29 && MATCH(payload, 0x1c, 0x00, 0xd2, 0x01))
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return true;
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if (len == 30 && MATCH(payload, 0x1d, 0x00, 0xd4, 0x02))
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return true;
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if (len == 4) {
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if (MATCH(payload, 0x03, 0x03, 0x80, 0x02))
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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_minecraft(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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if (match_mc_server_ping(data->payload[0], data->payload_len[0])) {
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if (match_mc_kick(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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if (match_mc_server_ping(data->payload[1], data->payload_len[1])) {
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if (match_mc_kick(data->payload[0], data->payload_len[0])) {
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return true;
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}
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}
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if (match_mc_handshake(data->payload[0], data->payload_len[0])) {
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if (match_mc_handshake_reply(data->payload[1],
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data->payload_len[1]))
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return true;
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/* apparently we can have handshake reqs in both dirs? */
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if (match_mc_handshake(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_mc_handshake(data->payload[1], data->payload_len[1])) {
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if (match_mc_handshake_reply(data->payload[0],
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data->payload_len[0]))
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return true;
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/* apparently we can have handshake reqs in both dirs? */
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if (match_mc_handshake(data->payload[0], data->payload_len[0]))
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return true;
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}
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/* Some servers running old versions of MC are annoying and send
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* single byte packets */
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if (match_mc_v5_handshake(data->payload[0], data->payload_len[0])) {
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if (data->payload_len[1] == 1)
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return true;
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}
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if (match_mc_v5_handshake(data->payload[1], data->payload_len[1])) {
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if (data->payload_len[0] == 1)
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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_minecraft = {
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LPI_PROTO_MINECRAFT,
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LPI_CATEGORY_GAMING,
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"Minecraft",
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35,
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match_minecraft
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};
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void register_minecraft(LPIModuleMap *mod_map) {
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register_protocol(&lpi_minecraft, mod_map);
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}
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