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package net.minecraft.server.rcon.thread;
import com.google.common.collect.Maps;
import com.mojang.logging.LogUtils;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.PortUnreachableException;
import java.net.SocketAddress;
import java.net.SocketTimeoutException;
import java.net.UnknownHostException;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import javax.annotation.Nullable;
import net.minecraft.Util;
import net.minecraft.server.ServerInterface;
import net.minecraft.server.rcon.NetworkDataOutputStream;
import net.minecraft.server.rcon.PktUtils;
import net.minecraft.util.RandomSource;
import org.slf4j.Logger;
public class QueryThreadGs4 extends GenericThread {
private static final Logger LOGGER = LogUtils.getLogger();
private static final String GAME_TYPE = "SMP";
private static final String GAME_ID = "MINECRAFT";
private static final long CHALLENGE_CHECK_INTERVAL = 30000L;
private static final long RESPONSE_CACHE_TIME = 5000L;
private long lastChallengeCheck;
private final int port;
private final int serverPort;
private final int maxPlayers;
private final String serverName;
private final String worldName;
private DatagramSocket socket;
private final byte[] buffer = new byte[1460];
private String hostIp;
private String serverIp;
private final Map<SocketAddress, QueryThreadGs4.RequestChallenge> validChallenges;
private final NetworkDataOutputStream rulesResponse;
private long lastRulesResponse;
private final ServerInterface serverInterface;
private QueryThreadGs4(ServerInterface p_11541_, int p_11542_) {
super("Query Listener");
this.serverInterface = p_11541_;
this.port = p_11542_;
this.serverIp = p_11541_.getServerIp();
this.serverPort = p_11541_.getServerPort();
this.serverName = p_11541_.getServerName();
this.maxPlayers = p_11541_.getMaxPlayers();
this.worldName = p_11541_.getLevelIdName();
this.lastRulesResponse = 0L;
this.hostIp = "0.0.0.0";
if (!this.serverIp.isEmpty() && !this.hostIp.equals(this.serverIp)) {
this.hostIp = this.serverIp;
} else {
this.serverIp = "0.0.0.0";
try {
InetAddress inetaddress = InetAddress.getLocalHost();
this.hostIp = inetaddress.getHostAddress();
} catch (UnknownHostException unknownhostexception) {
LOGGER.warn("Unable to determine local host IP, please set server-ip in server.properties", (Throwable)unknownhostexception);
}
}
this.rulesResponse = new NetworkDataOutputStream(1460);
this.validChallenges = Maps.newHashMap();
}
@Nullable
public static QueryThreadGs4 create(ServerInterface p_11554_) {
int i = p_11554_.getProperties().queryPort;
if (0 < i && 65535 >= i) {
QueryThreadGs4 querythreadgs4 = new QueryThreadGs4(p_11554_, i);
return !querythreadgs4.start() ? null : querythreadgs4;
} else {
LOGGER.warn("Invalid query port {} found in server.properties (queries disabled)", i);
return null;
}
}
private void sendTo(byte[] p_11556_, DatagramPacket p_11557_) throws IOException {
this.socket.send(new DatagramPacket(p_11556_, p_11556_.length, p_11557_.getSocketAddress()));
}
private boolean processPacket(DatagramPacket p_11550_) throws IOException {
byte[] abyte = p_11550_.getData();
int i = p_11550_.getLength();
SocketAddress socketaddress = p_11550_.getSocketAddress();
LOGGER.debug("Packet len {} [{}]", i, socketaddress);
if (3 <= i && -2 == abyte[0] && -3 == abyte[1]) {
LOGGER.debug("Packet '{}' [{}]", PktUtils.toHexString(abyte[2]), socketaddress);
switch (abyte[2]) {
case 0:
if (!this.validChallenge(p_11550_)) {
LOGGER.debug("Invalid challenge [{}]", socketaddress);
return false;
} else if (15 == i) {
this.sendTo(this.buildRuleResponse(p_11550_), p_11550_);
LOGGER.debug("Rules [{}]", socketaddress);
} else {
NetworkDataOutputStream networkdataoutputstream = new NetworkDataOutputStream(1460);
networkdataoutputstream.write(0);
networkdataoutputstream.writeBytes(this.getIdentBytes(p_11550_.getSocketAddress()));
networkdataoutputstream.writeString(this.serverName);
networkdataoutputstream.writeString("SMP");
networkdataoutputstream.writeString(this.worldName);
networkdataoutputstream.writeString(Integer.toString(this.serverInterface.getPlayerCount()));
networkdataoutputstream.writeString(Integer.toString(this.maxPlayers));
networkdataoutputstream.writeShort((short)this.serverPort);
networkdataoutputstream.writeString(this.hostIp);
this.sendTo(networkdataoutputstream.toByteArray(), p_11550_);
LOGGER.debug("Status [{}]", socketaddress);
}
default:
return true;
case 9:
this.sendChallenge(p_11550_);
LOGGER.debug("Challenge [{}]", socketaddress);
return true;
}
} else {
LOGGER.debug("Invalid packet [{}]", socketaddress);
return false;
}
}
private byte[] buildRuleResponse(DatagramPacket p_11559_) throws IOException {
long i = Util.getMillis();
if (i < this.lastRulesResponse + 5000L) {
byte[] abyte = this.rulesResponse.toByteArray();
byte[] abyte1 = this.getIdentBytes(p_11559_.getSocketAddress());
abyte[1] = abyte1[0];
abyte[2] = abyte1[1];
abyte[3] = abyte1[2];
abyte[4] = abyte1[3];
return abyte;
} else {
this.lastRulesResponse = i;
this.rulesResponse.reset();
this.rulesResponse.write(0);
this.rulesResponse.writeBytes(this.getIdentBytes(p_11559_.getSocketAddress()));
this.rulesResponse.writeString("splitnum");
this.rulesResponse.write(128);
this.rulesResponse.write(0);
this.rulesResponse.writeString("hostname");
this.rulesResponse.writeString(this.serverName);
this.rulesResponse.writeString("gametype");
this.rulesResponse.writeString("SMP");
this.rulesResponse.writeString("game_id");
this.rulesResponse.writeString("MINECRAFT");
this.rulesResponse.writeString("version");
this.rulesResponse.writeString(this.serverInterface.getServerVersion());
this.rulesResponse.writeString("plugins");
this.rulesResponse.writeString(this.serverInterface.getPluginNames());
this.rulesResponse.writeString("map");
this.rulesResponse.writeString(this.worldName);
this.rulesResponse.writeString("numplayers");
this.rulesResponse.writeString(this.serverInterface.getPlayerCount() + "");
this.rulesResponse.writeString("maxplayers");
this.rulesResponse.writeString(this.maxPlayers + "");
this.rulesResponse.writeString("hostport");
this.rulesResponse.writeString(this.serverPort + "");
this.rulesResponse.writeString("hostip");
this.rulesResponse.writeString(this.hostIp);
this.rulesResponse.write(0);
this.rulesResponse.write(1);
this.rulesResponse.writeString("player_");
this.rulesResponse.write(0);
String[] astring = this.serverInterface.getPlayerNames();
for (String s : astring) {
this.rulesResponse.writeString(s);
}
this.rulesResponse.write(0);
return this.rulesResponse.toByteArray();
}
}
private byte[] getIdentBytes(SocketAddress p_11552_) {
return this.validChallenges.get(p_11552_).getIdentBytes();
}
private Boolean validChallenge(DatagramPacket p_11561_) {
SocketAddress socketaddress = p_11561_.getSocketAddress();
if (!this.validChallenges.containsKey(socketaddress)) {
return false;
} else {
byte[] abyte = p_11561_.getData();
return this.validChallenges.get(socketaddress).getChallenge() == PktUtils.intFromNetworkByteArray(abyte, 7, p_11561_.getLength());
}
}
private void sendChallenge(DatagramPacket p_11564_) throws IOException {
QueryThreadGs4.RequestChallenge querythreadgs4$requestchallenge = new QueryThreadGs4.RequestChallenge(p_11564_);
this.validChallenges.put(p_11564_.getSocketAddress(), querythreadgs4$requestchallenge);
this.sendTo(querythreadgs4$requestchallenge.getChallengeBytes(), p_11564_);
}
private void pruneChallenges() {
if (this.running) {
long i = Util.getMillis();
if (i >= this.lastChallengeCheck + 30000L) {
this.lastChallengeCheck = i;
this.validChallenges.values().removeIf(p_11546_ -> p_11546_.before(i));
}
}
}
@Override
public void run() {
LOGGER.info("Query running on {}:{}", this.serverIp, this.port);
this.lastChallengeCheck = Util.getMillis();
DatagramPacket datagrampacket = new DatagramPacket(this.buffer, this.buffer.length);
try {
while (this.running) {
try {
this.socket.receive(datagrampacket);
this.pruneChallenges();
this.processPacket(datagrampacket);
} catch (SocketTimeoutException sockettimeoutexception) {
this.pruneChallenges();
} catch (PortUnreachableException portunreachableexception) {
} catch (IOException ioexception) {
this.recoverSocketError(ioexception);
}
}
} finally {
LOGGER.debug("closeSocket: {}:{}", this.serverIp, this.port);
this.socket.close();
}
}
@Override
public boolean start() {
if (this.running) {
return true;
} else {
return !this.initSocket() ? false : super.start();
}
}
private void recoverSocketError(Exception p_11548_) {
if (this.running) {
LOGGER.warn("Unexpected exception", (Throwable)p_11548_);
if (!this.initSocket()) {
LOGGER.error("Failed to recover from exception, shutting down!");
this.running = false;
}
}
}
private boolean initSocket() {
try {
this.socket = new DatagramSocket(this.port, InetAddress.getByName(this.serverIp));
this.socket.setSoTimeout(500);
return true;
} catch (Exception exception) {
LOGGER.warn("Unable to initialise query system on {}:{}", this.serverIp, this.port, exception);
return false;
}
}
static class RequestChallenge {
private final long time = new Date().getTime();
private final int challenge;
private final byte[] identBytes;
private final byte[] challengeBytes;
private final String ident;
public RequestChallenge(DatagramPacket p_11573_) {
byte[] abyte = p_11573_.getData();
this.identBytes = new byte[4];
this.identBytes[0] = abyte[3];
this.identBytes[1] = abyte[4];
this.identBytes[2] = abyte[5];
this.identBytes[3] = abyte[6];
this.ident = new String(this.identBytes, StandardCharsets.UTF_8);
this.challenge = RandomSource.create().nextInt(16777216);
this.challengeBytes = String.format(Locale.ROOT, "\t%s%d\u0000", this.ident, this.challenge).getBytes(StandardCharsets.UTF_8);
}
public Boolean before(long p_11576_) {
return this.time < p_11576_;
}
public int getChallenge() {
return this.challenge;
}
public byte[] getChallengeBytes() {
return this.challengeBytes;
}
public byte[] getIdentBytes() {
return this.identBytes;
}
public String getIdent() {
return this.ident;
}
}
} |