348 lines
12 KiB
Java
348 lines
12 KiB
Java
package net.minecraft.server.rcon.thread;
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import com.google.common.collect.Maps;
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import com.mojang.logging.LogUtils;
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import java.io.IOException;
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import java.net.DatagramPacket;
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import java.net.DatagramSocket;
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import java.net.InetAddress;
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import java.net.PortUnreachableException;
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import java.net.SocketAddress;
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import java.net.SocketTimeoutException;
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import java.net.UnknownHostException;
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import java.nio.charset.StandardCharsets;
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import java.util.Date;
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import java.util.Locale;
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import java.util.Map;
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import net.minecraft.Util;
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import net.minecraft.server.ServerInterface;
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import net.minecraft.server.rcon.NetworkDataOutputStream;
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import net.minecraft.server.rcon.PktUtils;
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import net.minecraft.util.RandomSource;
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import org.jetbrains.annotations.Nullable;
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import org.slf4j.Logger;
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public class QueryThreadGs4 extends GenericThread {
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private static final Logger LOGGER = LogUtils.getLogger();
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private static final String GAME_TYPE = "SMP";
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private static final String GAME_ID = "MINECRAFT";
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private static final long CHALLENGE_CHECK_INTERVAL = 30000L;
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private static final long RESPONSE_CACHE_TIME = 5000L;
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private long lastChallengeCheck;
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private final int port;
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private final int serverPort;
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private final int maxPlayers;
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private final String serverName;
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private final String worldName;
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private DatagramSocket socket;
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private final byte[] buffer = new byte[1460];
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private String hostIp;
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private String serverIp;
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private final Map<SocketAddress, QueryThreadGs4.RequestChallenge> validChallenges;
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private final NetworkDataOutputStream rulesResponse;
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private long lastRulesResponse;
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private final ServerInterface serverInterface;
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private QueryThreadGs4(ServerInterface serverInterface, int port) {
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super("Query Listener");
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this.serverInterface = serverInterface;
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this.port = port;
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this.serverIp = serverInterface.getServerIp();
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this.serverPort = serverInterface.getServerPort();
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this.serverName = serverInterface.getServerName();
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this.maxPlayers = serverInterface.getMaxPlayers();
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this.worldName = serverInterface.getLevelIdName();
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this.lastRulesResponse = 0L;
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this.hostIp = "0.0.0.0";
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if (!this.serverIp.isEmpty() && !this.hostIp.equals(this.serverIp)) {
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this.hostIp = this.serverIp;
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} else {
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this.serverIp = "0.0.0.0";
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try {
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InetAddress inetAddress = InetAddress.getLocalHost();
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this.hostIp = inetAddress.getHostAddress();
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} catch (UnknownHostException var4) {
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LOGGER.warn("Unable to determine local host IP, please set server-ip in server.properties", (Throwable)var4);
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}
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}
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this.rulesResponse = new NetworkDataOutputStream(1460);
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this.validChallenges = Maps.<SocketAddress, QueryThreadGs4.RequestChallenge>newHashMap();
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}
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@Nullable
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public static QueryThreadGs4 create(ServerInterface serverInterface) {
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int i = serverInterface.getProperties().queryPort;
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if (0 < i && 65535 >= i) {
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QueryThreadGs4 queryThreadGs4 = new QueryThreadGs4(serverInterface, i);
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return !queryThreadGs4.start() ? null : queryThreadGs4;
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} else {
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LOGGER.warn("Invalid query port {} found in server.properties (queries disabled)", i);
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return null;
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}
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}
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/**
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* Sends a byte array as a DatagramPacket response to the client who sent the given DatagramPacket
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*/
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private void sendTo(byte[] data, DatagramPacket requestPacket) throws IOException {
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this.socket.send(new DatagramPacket(data, data.length, requestPacket.getSocketAddress()));
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}
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/**
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* Parses an incoming DatagramPacket, returning true if the packet was valid
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*/
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private boolean processPacket(DatagramPacket requestPacket) throws IOException {
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byte[] bs = requestPacket.getData();
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int i = requestPacket.getLength();
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SocketAddress socketAddress = requestPacket.getSocketAddress();
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LOGGER.debug("Packet len {} [{}]", i, socketAddress);
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if (3 <= i && -2 == bs[0] && -3 == bs[1]) {
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LOGGER.debug("Packet '{}' [{}]", PktUtils.toHexString(bs[2]), socketAddress);
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switch (bs[2]) {
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case 0:
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if (!this.validChallenge(requestPacket)) {
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LOGGER.debug("Invalid challenge [{}]", socketAddress);
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return false;
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} else if (15 == i) {
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this.sendTo(this.buildRuleResponse(requestPacket), requestPacket);
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LOGGER.debug("Rules [{}]", socketAddress);
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} else {
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NetworkDataOutputStream networkDataOutputStream = new NetworkDataOutputStream(1460);
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networkDataOutputStream.write(0);
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networkDataOutputStream.writeBytes(this.getIdentBytes(requestPacket.getSocketAddress()));
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networkDataOutputStream.writeString(this.serverName);
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networkDataOutputStream.writeString("SMP");
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networkDataOutputStream.writeString(this.worldName);
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networkDataOutputStream.writeString(Integer.toString(this.serverInterface.getPlayerCount()));
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networkDataOutputStream.writeString(Integer.toString(this.maxPlayers));
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networkDataOutputStream.writeShort((short)this.serverPort);
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networkDataOutputStream.writeString(this.hostIp);
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this.sendTo(networkDataOutputStream.toByteArray(), requestPacket);
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LOGGER.debug("Status [{}]", socketAddress);
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}
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default:
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return true;
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case 9:
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this.sendChallenge(requestPacket);
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LOGGER.debug("Challenge [{}]", socketAddress);
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return true;
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}
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} else {
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LOGGER.debug("Invalid packet [{}]", socketAddress);
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return false;
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}
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}
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/**
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* Creates a query response as a byte array for the specified query DatagramPacket
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*/
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private byte[] buildRuleResponse(DatagramPacket requestPacket) throws IOException {
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long l = Util.getMillis();
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if (l < this.lastRulesResponse + 5000L) {
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byte[] bs = this.rulesResponse.toByteArray();
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byte[] cs = this.getIdentBytes(requestPacket.getSocketAddress());
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bs[1] = cs[0];
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bs[2] = cs[1];
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bs[3] = cs[2];
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bs[4] = cs[3];
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return bs;
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} else {
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this.lastRulesResponse = l;
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this.rulesResponse.reset();
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this.rulesResponse.write(0);
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this.rulesResponse.writeBytes(this.getIdentBytes(requestPacket.getSocketAddress()));
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this.rulesResponse.writeString("splitnum");
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this.rulesResponse.write(128);
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this.rulesResponse.write(0);
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this.rulesResponse.writeString("hostname");
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this.rulesResponse.writeString(this.serverName);
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this.rulesResponse.writeString("gametype");
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this.rulesResponse.writeString("SMP");
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this.rulesResponse.writeString("game_id");
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this.rulesResponse.writeString("MINECRAFT");
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this.rulesResponse.writeString("version");
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this.rulesResponse.writeString(this.serverInterface.getServerVersion());
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this.rulesResponse.writeString("plugins");
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this.rulesResponse.writeString(this.serverInterface.getPluginNames());
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this.rulesResponse.writeString("map");
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this.rulesResponse.writeString(this.worldName);
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this.rulesResponse.writeString("numplayers");
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this.rulesResponse.writeString(this.serverInterface.getPlayerCount() + "");
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this.rulesResponse.writeString("maxplayers");
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this.rulesResponse.writeString(this.maxPlayers + "");
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this.rulesResponse.writeString("hostport");
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this.rulesResponse.writeString(this.serverPort + "");
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this.rulesResponse.writeString("hostip");
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this.rulesResponse.writeString(this.hostIp);
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this.rulesResponse.write(0);
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this.rulesResponse.write(1);
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this.rulesResponse.writeString("player_");
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this.rulesResponse.write(0);
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String[] strings = this.serverInterface.getPlayerNames();
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for (String string : strings) {
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this.rulesResponse.writeString(string);
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}
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this.rulesResponse.write(0);
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return this.rulesResponse.toByteArray();
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}
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}
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/**
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* Returns the request ID provided by the authorized client
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*/
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private byte[] getIdentBytes(SocketAddress address) {
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return ((QueryThreadGs4.RequestChallenge)this.validChallenges.get(address)).getIdentBytes();
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}
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/**
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* Returns {@code true} if the client has a valid auth, otherwise {@code false}.
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*/
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private Boolean validChallenge(DatagramPacket requestPacket) {
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SocketAddress socketAddress = requestPacket.getSocketAddress();
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if (!this.validChallenges.containsKey(socketAddress)) {
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return false;
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} else {
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byte[] bs = requestPacket.getData();
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return ((QueryThreadGs4.RequestChallenge)this.validChallenges.get(socketAddress)).getChallenge()
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== PktUtils.intFromNetworkByteArray(bs, 7, requestPacket.getLength());
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}
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}
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/**
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* Sends an auth challenge DatagramPacket to the client and adds the client to the queryClients map
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*/
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private void sendChallenge(DatagramPacket requestPacket) throws IOException {
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QueryThreadGs4.RequestChallenge requestChallenge = new QueryThreadGs4.RequestChallenge(requestPacket);
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this.validChallenges.put(requestPacket.getSocketAddress(), requestChallenge);
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this.sendTo(requestChallenge.getChallengeBytes(), requestPacket);
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}
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/**
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* Removes all clients whose auth is no longer valid
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*/
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private void pruneChallenges() {
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if (this.running) {
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long l = Util.getMillis();
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if (l >= this.lastChallengeCheck + 30000L) {
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this.lastChallengeCheck = l;
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this.validChallenges.values().removeIf(requestChallenge -> requestChallenge.before(l));
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}
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}
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}
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public void run() {
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LOGGER.info("Query running on {}:{}", this.serverIp, this.port);
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this.lastChallengeCheck = Util.getMillis();
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DatagramPacket datagramPacket = new DatagramPacket(this.buffer, this.buffer.length);
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try {
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while (this.running) {
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try {
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this.socket.receive(datagramPacket);
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this.pruneChallenges();
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this.processPacket(datagramPacket);
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} catch (SocketTimeoutException var8) {
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this.pruneChallenges();
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} catch (PortUnreachableException var9) {
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} catch (IOException var10) {
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this.recoverSocketError(var10);
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}
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}
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} finally {
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LOGGER.debug("closeSocket: {}:{}", this.serverIp, this.port);
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this.socket.close();
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}
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}
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@Override
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public boolean start() {
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if (this.running) {
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return true;
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} else {
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return !this.initSocket() ? false : super.start();
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}
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}
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/**
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* Stops the query server and reports the given Exception
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*/
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private void recoverSocketError(Exception exception) {
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if (this.running) {
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LOGGER.warn("Unexpected exception", (Throwable)exception);
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if (!this.initSocket()) {
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LOGGER.error("Failed to recover from exception, shutting down!");
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this.running = false;
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}
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}
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}
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/**
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* Initializes the query system by binding it to a port
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*/
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private boolean initSocket() {
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try {
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this.socket = new DatagramSocket(this.port, InetAddress.getByName(this.serverIp));
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this.socket.setSoTimeout(500);
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return true;
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} catch (Exception var2) {
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LOGGER.warn("Unable to initialise query system on {}:{}", this.serverIp, this.port, var2);
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return false;
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}
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}
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static class RequestChallenge {
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private final long time = new Date().getTime();
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private final int challenge;
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private final byte[] identBytes;
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private final byte[] challengeBytes;
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private final String ident;
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public RequestChallenge(DatagramPacket datagramPacket) {
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byte[] bs = datagramPacket.getData();
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this.identBytes = new byte[4];
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this.identBytes[0] = bs[3];
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this.identBytes[1] = bs[4];
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this.identBytes[2] = bs[5];
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this.identBytes[3] = bs[6];
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this.ident = new String(this.identBytes, StandardCharsets.UTF_8);
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this.challenge = RandomSource.create().nextInt(16777216);
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this.challengeBytes = String.format(Locale.ROOT, "\t%s%d\u0000", this.ident, this.challenge).getBytes(StandardCharsets.UTF_8);
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}
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/**
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* Returns {@code true} if the auth's creation timestamp is less than the given time, otherwise {@code false}.
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*/
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public Boolean before(long currentTime) {
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return this.time < currentTime;
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}
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/**
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* Returns the random challenge number assigned to this auth
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*/
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public int getChallenge() {
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return this.challenge;
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}
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/**
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* Returns the auth challenge value
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*/
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public byte[] getChallengeBytes() {
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return this.challengeBytes;
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}
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/**
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* Returns the request ID provided by the client.
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*/
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public byte[] getIdentBytes() {
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return this.identBytes;
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}
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public String getIdent() {
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return this.ident;
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}
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}
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}
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