mirror of https://github.com/GeyserMC/Geyser.git
304 lines
10 KiB
Java
304 lines
10 KiB
Java
/*
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* Copyright (c) 2019-2022 GeyserMC. http://geysermc.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @author GeyserMC
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* @link https://github.com/GeyserMC/Geyser
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*/
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package org.geysermc.geyser.network;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufAllocator;
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import org.geysermc.geyser.GeyserImpl;
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import org.geysermc.geyser.ping.GeyserPingInfo;
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import org.geysermc.geyser.translator.text.MessageTranslator;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.ThreadLocalRandom;
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public class QueryPacketHandler {
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public static final byte HANDSHAKE = 0x09;
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public static final byte STATISTICS = 0x00;
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private final GeyserImpl geyser;
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private final InetSocketAddress sender;
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private final byte type;
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private final int sessionId;
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private byte[] token;
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/**
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* The Query packet handler instance. The unsigned short magic handshake should already be read at this point,
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* and the packet should be verified to have enough buffer space to be a qualified query packet.
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*
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* @param geyser Geyser
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* @param sender The Sender IP/Port for the Query
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* @param buffer The Query data
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*/
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public QueryPacketHandler(GeyserImpl geyser, InetSocketAddress sender, ByteBuf buffer) {
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this.geyser = geyser;
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this.sender = sender;
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this.type = buffer.readByte();
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this.sessionId = buffer.readInt();
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regenerateToken();
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handle();
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}
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/**
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* Checks the packet is in fact a query packet
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*
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* @param buffer Query data
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* @return if the packet is a query packet
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*/
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public static boolean isQueryPacket(ByteBuf buffer) {
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// 2 for magic short, 1 for type byte and 4 for session ID int
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return buffer.readableBytes() >= (2 + 1 + 4) && buffer.readUnsignedShort() == 0xFEFD;
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}
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/**
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* Handles the query
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*/
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private void handle() {
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switch (type) {
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case HANDSHAKE:
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sendToken();
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break;
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case STATISTICS:
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sendQueryData();
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break;
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}
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}
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/**
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* Sends the token to the sender
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*/
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private void sendToken() {
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ByteBuf reply = ByteBufAllocator.DEFAULT.ioBuffer(10);
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reply.writeByte(HANDSHAKE);
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reply.writeInt(sessionId);
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reply.writeBytes(getTokenString(this.token, this.sender.getAddress()));
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reply.writeByte(0);
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sendPacket(reply);
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}
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/**
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* Sends the query data to the sender
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*/
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private void sendQueryData() {
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byte[] gameData = getGameData();
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byte[] playerData = getPlayers();
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ByteBuf reply = ByteBufAllocator.DEFAULT.ioBuffer(1 + 4 + gameData.length + playerData.length);
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reply.writeByte(STATISTICS);
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reply.writeInt(sessionId);
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// Game Info
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reply.writeBytes(gameData);
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// Players
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reply.writeBytes(playerData);
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sendPacket(reply);
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}
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/**
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* Gets the game data for the query
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*
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* @return the game data for the query
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*/
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private byte[] getGameData() {
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ByteArrayOutputStream query = new ByteArrayOutputStream();
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GeyserPingInfo pingInfo = null;
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String motd;
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String currentPlayerCount;
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String maxPlayerCount;
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String map;
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if (geyser.getConfig().isPassthroughMotd() || geyser.getConfig().isPassthroughPlayerCounts()) {
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pingInfo = geyser.getBootstrap().getGeyserPingPassthrough().getPingInformation();
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}
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if (geyser.getConfig().isPassthroughMotd() && pingInfo != null) {
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String[] javaMotd = MessageTranslator.convertMessageLenient(pingInfo.getDescription()).split("\n");
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motd = javaMotd[0].trim(); // First line of the motd.
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} else {
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motd = geyser.getConfig().getBedrock().primaryMotd();
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}
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// If passthrough player counts is enabled lets get players from the server
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if (geyser.getConfig().isPassthroughPlayerCounts() && pingInfo != null) {
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currentPlayerCount = String.valueOf(pingInfo.getPlayers().getOnline());
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maxPlayerCount = String.valueOf(pingInfo.getPlayers().getMax());
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} else {
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currentPlayerCount = String.valueOf(geyser.getSessionManager().getSessions().size());
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maxPlayerCount = String.valueOf(geyser.getConfig().getMaxPlayers());
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}
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// If passthrough protocol name is enabled let's get the protocol name from the ping response.
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if (geyser.getConfig().isPassthroughProtocolName() && pingInfo != null) {
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map = pingInfo.getVersion().getName();
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} else {
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map = GeyserImpl.NAME;
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}
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// Create a hashmap of all game data needed in the query
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Map<String, String> gameData = new HashMap<>();
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gameData.put("hostname", motd);
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gameData.put("gametype", "SMP");
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gameData.put("game_id", "MINECRAFT");
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gameData.put("version", GeyserImpl.NAME + " (" + GeyserImpl.GIT_VERSION + ") " + GameProtocol.DEFAULT_BEDROCK_CODEC.getMinecraftVersion());
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gameData.put("plugins", "");
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gameData.put("map", map);
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gameData.put("numplayers", currentPlayerCount);
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gameData.put("maxplayers", maxPlayerCount);
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gameData.put("hostport", String.valueOf(geyser.getConfig().getBedrock().port()));
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gameData.put("hostip", geyser.getConfig().getBedrock().address());
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try {
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writeString(query, "GeyserMC");
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query.write((byte) 0x80);
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query.write((byte) 0x00);
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// Fills the game data
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for (Map.Entry<String, String> entry : gameData.entrySet()) {
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writeString(query, entry.getKey());
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writeString(query, entry.getValue());
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}
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// Final byte to show the end of the game data
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query.write(new byte[] { 0x00, 0x01 });
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return query.toByteArray();
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} catch (IOException e) {
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e.printStackTrace();
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return new byte[0];
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}
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}
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/**
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* Generate a byte[] storing the player names
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*
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* @return The byte[] representation of players
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*/
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private byte[] getPlayers() {
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ByteArrayOutputStream query = new ByteArrayOutputStream();
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GeyserPingInfo pingInfo = null;
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if (geyser.getConfig().isPassthroughMotd() || geyser.getConfig().isPassthroughPlayerCounts()) {
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pingInfo = geyser.getBootstrap().getGeyserPingPassthrough().getPingInformation();
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}
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try {
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// Start the player section
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writeString(query, "player_");
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query.write((byte) 0x00);
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// Fill player names
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if (pingInfo != null) {
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for (String username : pingInfo.getPlayerList()) {
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writeString(query, username);
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}
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}
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// Final byte to show the end of the player data
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query.write((byte) 0x00);
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return query.toByteArray();
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} catch (IOException e) {
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e.printStackTrace();
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return new byte[0];
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}
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}
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/**
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* Partially mimics {@link java.io.DataOutputStream#writeBytes(String)} which is what the Minecraft server uses as of 1.17.1.
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*/
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private void writeString(OutputStream stream, String value) throws IOException {
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int length = value.length();
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for (int i = 0; i < length; i++) {
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stream.write((byte) value.charAt(i));
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}
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// Padding to indicate the end of the string
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stream.write((byte) 0x00);
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}
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/**
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* Sends a packet to the sender
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*
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* @param data packet data
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*/
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private void sendPacket(ByteBuf data) {
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// geyser.getBedrockServer().getRakNet().send(sender, data);
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}
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/**
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* Regenerates a token
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*/
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public void regenerateToken() {
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byte[] token = new byte[16];
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for (int i = 0; i < 16; i++) {
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token[i] = (byte) ThreadLocalRandom.current().nextInt(255);
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}
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this.token = token;
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}
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/**
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* Gets an MD5 token for the current IP/Port.
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* This should reset every 30 seconds but a new one is generated per instance
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* Seems wasteful to code something in to clear it when it has no use.
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*
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* @param token the token
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* @param address the address
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* @return an MD5 token for the current IP/Port
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*/
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public static byte[] getTokenString(byte[] token, InetAddress address) {
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try {
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// Generate an MD5 hash from the address
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MessageDigest digest = MessageDigest.getInstance("MD5");
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digest.update(address.toString().getBytes(StandardCharsets.UTF_8));
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digest.update(token);
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// Get the first 4 bytes of the digest
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byte[] digestBytes = Arrays.copyOf(digest.digest(), 4);
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// Convert the bytes to a buffer
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ByteBuffer byteBuffer = ByteBuffer.wrap(digestBytes);
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// Turn the number into a null terminated string
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return (byteBuffer.getInt() + "\0").getBytes();
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} catch (NoSuchAlgorithmException e) {
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return (ByteBuffer.allocate(4).putInt(ThreadLocalRandom.current().nextInt()).getInt() + "\0").getBytes();
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}
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}
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}
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