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Paper/CraftBukkit-Patches/0023-Netty.patch

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From 3e9c07b33591057a144c397cf6ae7846ee661fcc Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Tue, 2 Jul 2013 09:06:29 +1000
Subject: [PATCH] Netty
diff --git a/pom.xml b/pom.xml
index c155913..3ca28d6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -112,6 +112,21 @@
<artifactId>trove4j</artifactId>
<version>3.0.3</version>
</dependency>
+ <dependency>
+ <groupId>io.netty</groupId>
+ <artifactId>netty-codec</artifactId>
+ <version>4.0.9.Final</version>
+ </dependency>
+ <dependency>
+ <groupId>io.netty</groupId>
+ <artifactId>netty-handler</artifactId>
+ <version>4.0.9.Final</version>
+ </dependency>
+ <dependency>
+ <groupId>org.javassist</groupId>
+ <artifactId>javassist</artifactId>
+ <version>3.18.0-GA</version>
+ </dependency>
</dependencies>
<!-- This builds a completely 'ready to start' jar with all dependencies inside -->
diff --git a/src/main/java/net/minecraft/server/DedicatedServer.java b/src/main/java/net/minecraft/server/DedicatedServer.java
index 0cca057..4759f6a 100644
--- a/src/main/java/net/minecraft/server/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/DedicatedServer.java
@@ -101,7 +101,11 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer
this.getLogger().info("Starting Minecraft server on " + (this.getServerIp().length() == 0 ? "*" : this.getServerIp()) + ":" + this.I());
try {
- this.s = new DedicatedServerConnection(this, inetaddress, this.I());
+ // Spigot start
+ this.s = ( org.spigotmc.SpigotConfig.listeners.get( 0 ).netty )
+ ? new org.spigotmc.netty.NettyServerConnection( this, inetaddress, this.I() )
+ : new DedicatedServerConnection( this, inetaddress, this.I() );
+ // Spigot end
} catch (Throwable ioexception) { // CraftBukkit - IOException -> Throwable
this.getLogger().warning("**** FAILED TO BIND TO PORT!");
this.getLogger().warning("The exception was: {0}", new Object[] { ioexception.toString()});
diff --git a/src/main/java/net/minecraft/server/INetworkManager.java b/src/main/java/net/minecraft/server/INetworkManager.java
new file mode 100644
index 0000000..6fcc5d7
--- /dev/null
+++ b/src/main/java/net/minecraft/server/INetworkManager.java
@@ -0,0 +1,26 @@
+package net.minecraft.server;
+
+import java.net.SocketAddress;
+
+public interface INetworkManager {
+
+ void a(Connection connection);
+
+ void queue(Packet packet);
+
+ void a();
+
+ void b();
+
+ SocketAddress getSocketAddress();
+
+ void d();
+
+ int e();
+
+ void a(String s, Object... aobject);
+
+ java.net.Socket getSocket(); // Spigot
+
+ void setSocketAddress(java.net.SocketAddress address); // Spigot
+}
diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
index a2bdfa3..fd6acab 100644
--- a/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/src/main/java/net/minecraft/server/NetworkManager.java
@@ -27,7 +27,7 @@ public class NetworkManager implements INetworkManager {
private final Object h = new Object();
private final IConsoleLogManager i;
public Socket socket; // CraftBukkit - private -> public
- private final SocketAddress k;
+ private SocketAddress k; // Spigot - remove final
private volatile DataInputStream input;
private volatile DataOutputStream output;
private volatile boolean n = true;
@@ -374,4 +374,6 @@ public class NetworkManager implements INetworkManager {
static Thread h(NetworkManager networkmanager) {
return networkmanager.u;
}
+
+ public void setSocketAddress(SocketAddress address) { k = address; } // Spigot
}
diff --git a/src/main/java/net/minecraft/server/PendingConnection.java b/src/main/java/net/minecraft/server/PendingConnection.java
index 2a96168..6ffc927 100644
--- a/src/main/java/net/minecraft/server/PendingConnection.java
+++ b/src/main/java/net/minecraft/server/PendingConnection.java
@@ -16,7 +16,7 @@ public class PendingConnection extends Connection {
private static Random random = new Random();
private byte[] d;
private final MinecraftServer server;
- public final NetworkManager networkManager;
+ public final INetworkManager networkManager;
public boolean b;
private int f;
private String g;
@@ -26,10 +26,15 @@ public class PendingConnection extends Connection {
private SecretKey k;
public String hostname = ""; // CraftBukkit - add field
+ public PendingConnection(MinecraftServer minecraftserver, org.spigotmc.netty.NettyNetworkManager networkManager) {
+ this.server = minecraftserver;
+ this.networkManager = networkManager;
+ }
+
public PendingConnection(MinecraftServer minecraftserver, Socket socket, String s) throws java.io.IOException { // CraftBukkit - throws IOException
this.server = minecraftserver;
this.networkManager = new NetworkManager(minecraftserver.getLogger(), socket, s, this, minecraftserver.H().getPrivate());
- this.networkManager.e = 0;
+ // this.networkManager.e = 0;
}
// CraftBukkit start
@@ -148,7 +153,7 @@ public class PendingConnection extends Connection {
String s = null;
// CraftBukkit
org.bukkit.event.server.ServerListPingEvent pingEvent = org.bukkit.craftbukkit.event.CraftEventFactory.callServerListPingEvent(this.server.server, getSocket().getInetAddress(), this.server.getMotd(), playerlist.getPlayerCount(), playerlist.getMaxPlayers());
- if (packet254getinfo.d()) {
+ if (false) { // Spigot: TODO: Use trick from Bungee maybe?
// CraftBukkit
s = pingEvent.getMotd() + "\u00A7" + playerlist.getPlayerCount() + "\u00A7" + pingEvent.getMaxPlayers();
} else {
@@ -177,9 +182,18 @@ public class PendingConnection extends Connection {
this.networkManager.queue(new Packet255KickDisconnect(s));
this.networkManager.d();
- if (inetaddress != null && this.server.ag() instanceof DedicatedServerConnection) {
- ((DedicatedServerConnection) this.server.ag()).a(inetaddress);
+ // Spigot start
+ if ( inetaddress != null )
+ {
+ if ( this.server.ag() instanceof DedicatedServerConnection )
+ {
+ ((DedicatedServerConnection) this.server.ag()).a(inetaddress);
+ } else
+ {
+ ((org.spigotmc.netty.NettyServerConnection)this.server.ag()).unThrottle( inetaddress );
+ }
}
+ // Spigot end
this.b = true;
} catch (Exception exception) {
diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
index 01daf6d..d3e99eb 100644
--- a/src/main/java/org/spigotmc/SpigotConfig.java
+++ b/src/main/java/org/spigotmc/SpigotConfig.java
@@ -6,6 +6,8 @@ import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@@ -141,4 +143,62 @@ public class SpigotConfig
commands.put( "restart", new RestartCommand( "restart" ) );
WatchdogThread.doStart( timeoutTime, restartOnCrash );
}
+
+ public static class Listener
+ {
+
+ public String host;
+ public int port;
+ public boolean netty;
+ public long connectionThrottle;
+
+ public Listener(String host, int port, boolean netty, long connectionThrottle)
+ {
+ this.host = host;
+ this.port = port;
+ this.netty = netty;
+ this.connectionThrottle = connectionThrottle;
+ }
+ }
+ public static List<Listener> listeners = new ArrayList<Listener>();
+ public static int nettyThreads;
+ private static void listeners()
+ {
+ listeners.clear(); // We don't rebuild listeners on reload but we should clear them out!
+
+ Map<String, Object> def = new HashMap<String, Object>();
+ def.put( "host", "default" );
+ def.put( "port", "default" );
+ def.put( "netty", true );
+ // def.put( "throttle", "default" );
+
+ config.addDefault( "listeners", Collections.singletonList( def ) );
+ for ( Map<String, Object> info : (List<Map<String, Object>>) config.getList( "listeners" ) )
+ {
+ String host = (String) info.get( "host" );
+ if ( "default".equals( host ) )
+ {
+ host = Bukkit.getIp();
+ } else
+ {
+ throw new IllegalArgumentException( "Can only bind listener to default! Configure it in server.properties" );
+ }
+ int port ;
+
+ if (info.get( "port" ) instanceof Integer){
+ throw new IllegalArgumentException( "Can only bind port to default! Configure it in server.properties");
+ } else{
+ port = Bukkit.getPort();
+ }
+ boolean netty = (Boolean) info.get( "netty" );
+ // long connectionThrottle = ( info.get( "throttle" ) instanceof Number ) ? ( (Number) info.get( "throttle" ) ).longValue() : Bukkit.getConnectionThrottle();
+ listeners.add( new Listener( host, port, netty, Bukkit.getConnectionThrottle() ) );
+ }
+ if ( listeners.size() != 1 )
+ {
+ throw new IllegalArgumentException( "May only have one listener!" );
+ }
+
+ nettyThreads = getInt( "settings.netty-threads", 3 );
+ }
}
diff --git a/src/main/java/org/spigotmc/netty/CipherBase.java b/src/main/java/org/spigotmc/netty/CipherBase.java
new file mode 100644
index 0000000..c4306f7
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/CipherBase.java
@@ -0,0 +1,73 @@
+package org.spigotmc.netty;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import javax.crypto.Cipher;
+import javax.crypto.ShortBufferException;
+
+/**
+ * Class to expose an
+ * {@link #cipher(io.netty.buffer.ByteBuf, io.netty.buffer.ByteBuf)} method to
+ * aid in the efficient passing of ByteBuffers through a cipher.
+ */
+class CipherBase
+{
+
+ private final Cipher cipher;
+ private ThreadLocal<byte[]> heapInLocal = new EmptyByteThreadLocal();
+ private ThreadLocal<byte[]> heapOutLocal = new EmptyByteThreadLocal();
+
+ private static class EmptyByteThreadLocal extends ThreadLocal<byte[]>
+ {
+
+ @Override
+ protected byte[] initialValue()
+ {
+ return new byte[ 0 ];
+ }
+ }
+
+ protected CipherBase(Cipher cipher)
+ {
+ this.cipher = cipher;
+ }
+
+ private byte[] bufToByte(ByteBuf in)
+ {
+ byte[] heapIn = heapInLocal.get();
+ int readableBytes = in.readableBytes();
+ if ( heapIn.length < readableBytes )
+ {
+ heapIn = new byte[ readableBytes ];
+ heapInLocal.set( heapIn );
+ }
+ in.readBytes( heapIn, 0, readableBytes );
+ return heapIn;
+ }
+
+ protected ByteBuf cipher(ChannelHandlerContext ctx, ByteBuf in) throws ShortBufferException
+ {
+ int readableBytes = in.readableBytes();
+ byte[] heapIn = bufToByte( in );
+
+ ByteBuf heapOut = ctx.alloc().heapBuffer( cipher.getOutputSize( readableBytes ) );
+ heapOut.writerIndex( cipher.update( heapIn, 0, readableBytes, heapOut.array(), heapOut.arrayOffset() ) );
+
+ return heapOut;
+ }
+
+ protected void cipher(ByteBuf in, ByteBuf out) throws ShortBufferException
+ {
+ int readableBytes = in.readableBytes();
+ byte[] heapIn = bufToByte( in );
+
+ byte[] heapOut = heapOutLocal.get();
+ int outputSize = cipher.getOutputSize( readableBytes );
+ if ( heapOut.length < outputSize )
+ {
+ heapOut = new byte[ outputSize ];
+ heapOutLocal.set( heapOut );
+ }
+ out.writeBytes( heapOut, 0, cipher.update( heapIn, 0, readableBytes, heapOut ) );
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/CipherDecoder.java b/src/main/java/org/spigotmc/netty/CipherDecoder.java
new file mode 100644
index 0000000..e37bae7
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/CipherDecoder.java
@@ -0,0 +1,24 @@
+package org.spigotmc.netty;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.MessageToMessageDecoder;
+import java.util.List;
+import javax.crypto.Cipher;
+
+public class CipherDecoder extends MessageToMessageDecoder<ByteBuf>
+{
+
+ private final CipherBase cipher;
+
+ public CipherDecoder(Cipher cipher)
+ {
+ this.cipher = new CipherBase( cipher );
+ }
+
+ @Override
+ protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) throws Exception
+ {
+ out.add( cipher.cipher( ctx, msg ) );
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/CipherEncoder.java b/src/main/java/org/spigotmc/netty/CipherEncoder.java
new file mode 100644
index 0000000..2eb1dcb
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/CipherEncoder.java
@@ -0,0 +1,23 @@
+package org.spigotmc.netty;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.MessageToByteEncoder;
+import javax.crypto.Cipher;
+
+public class CipherEncoder extends MessageToByteEncoder<ByteBuf>
+{
+
+ private final CipherBase cipher;
+
+ public CipherEncoder(Cipher cipher)
+ {
+ this.cipher = new CipherBase( cipher );
+ }
+
+ @Override
+ protected void encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) throws Exception
+ {
+ cipher.cipher( in, out );
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/NettyNetworkManager.java b/src/main/java/org/spigotmc/netty/NettyNetworkManager.java
new file mode 100644
index 0000000..7dc16ac
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/NettyNetworkManager.java
@@ -0,0 +1,307 @@
+package org.spigotmc.netty;
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.channel.socket.SocketChannel;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.security.PrivateKey;
+import java.util.AbstractList;
+import java.util.List;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import javax.crypto.Cipher;
+import javax.crypto.SecretKey;
+import net.minecraft.server.Connection;
+import net.minecraft.server.INetworkManager;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.Packet;
+import net.minecraft.server.Packet252KeyResponse;
+import net.minecraft.server.Packet255KickDisconnect;
+import net.minecraft.server.PendingConnection;
+import net.minecraft.server.PlayerConnection;
+
+/**
+ * This class forms the basis of the Netty integration. It implements
+ * {@link INetworkManager} and handles all events and inbound messages provided
+ * by the upstream Netty process.
+ */
+public class NettyNetworkManager extends SimpleChannelInboundHandler<Packet> implements INetworkManager
+{
+
+ private static final ExecutorService threadPool = Executors.newCachedThreadPool( new ThreadFactoryBuilder().setNameFormat( "Async Packet Handler - %1$d" ).build() );
+ private static final MinecraftServer server = MinecraftServer.getServer();
+ private static final PrivateKey key = server.H().getPrivate();
+ private static final NettyServerConnection serverConnection = (NettyServerConnection) server.ag();
+ /*========================================================================*/
+ private final Queue<Packet> syncPackets = new ConcurrentLinkedQueue<Packet>();
+ private final List<Packet> highPriorityQueue = new AbstractList<Packet>()
+ {
+ @Override
+ public void add(int index, Packet element)
+ {
+ // NOP
+ }
+
+ @Override
+ public Packet get(int index)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public int size()
+ {
+ return 0;
+ }
+ };
+ private volatile boolean connected;
+ private Channel channel;
+ private SocketAddress address;
+ Connection connection;
+ private SecretKey secret;
+ private String dcReason;
+ private Object[] dcArgs;
+ private Socket socketAdaptor;
+ private long writtenBytes;
+ private PacketWriter writer;
+
+ @Override
+ public void channelActive(ChannelHandlerContext ctx) throws Exception
+ {
+ // Channel and address groundwork first
+ channel = ctx.channel();
+ address = channel.remoteAddress();
+ // Then the socket adaptor
+ socketAdaptor = NettySocketAdaptor.adapt( (SocketChannel) channel );
+ // Followed by their first handler
+ connection = new PendingConnection( server, this );
+ writer = new PacketWriter();
+ // Finally register the connection
+ connected = true;
+ serverConnection.register( (PendingConnection) connection );
+ }
+
+ @Override
+ public void channelInactive(ChannelHandlerContext ctx) throws Exception
+ {
+ a( "disconnect.endOfStream", new Object[ 0 ] );
+ }
+
+ @Override
+ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception
+ {
+ // TODO: Remove this once we are more stable
+ // Bukkit.getServer().getLogger().severe("======================= Start Netty Debug Log =======================");
+ // Bukkit.getServer().getLogger().log(Level.SEVERE, "Error caught whilst handling " + channel, cause);
+ // Bukkit.getServer().getLogger().severe("======================= End Netty Debug Log =======================");
+ // Disconnect with generic reason + exception
+ a( "disconnect.genericReason", new Object[]
+ {
+ "Internal exception: " + cause
+ } );
+ }
+
+ @Override
+ protected void channelRead0(ChannelHandlerContext ctx, final Packet msg) throws Exception
+ {
+ if ( connected )
+ {
+ if ( msg instanceof Packet252KeyResponse )
+ {
+ secret = ( (Packet252KeyResponse) msg ).a( key );
+ Cipher decrypt = NettyServerConnection.getCipher( Cipher.DECRYPT_MODE, secret );
+ channel.pipeline().addBefore( "decoder", "decrypt", new CipherDecoder( decrypt ) );
+ }
+
+ if ( msg.a_() )
+ {
+ threadPool.submit( new Runnable()
+ {
+ public void run()
+ {
+ Packet packet = PacketListener.callReceived( NettyNetworkManager.this, connection, msg );
+ if ( packet != null )
+ {
+ packet.handle( connection );
+ }
+ }
+ } );
+ } else
+ {
+ syncPackets.add( msg );
+ }
+ }
+ }
+
+ public Socket getSocket()
+ {
+ return socketAdaptor;
+ }
+
+ /**
+ * setHandler. Set the {@link NetHandler} used to process received packets.
+ *
+ * @param nh the new {@link NetHandler} instance
+ */
+ public void a(Connection nh)
+ {
+ connection = nh;
+ }
+
+ /**
+ * queue. Queue a packet for sending, or in this case send it to be write it
+ * straight to the channel.
+ *
+ * @param packet the packet to queue
+ */
+ public void queue(final Packet packet)
+ {
+ // Only send if channel is still connected
+ if ( connected )
+ {
+ // Process packet via handler
+ final Packet packet0 = PacketListener.callQueued( this, connection, packet );
+ highPriorityQueue.add( packet0 );
+ // If handler indicates packet send
+ if ( packet0 != null )
+ {
+ if ( channel.eventLoop().inEventLoop() )
+ {
+ queue0( packet0 );
+ } else
+ {
+ channel.eventLoop().execute( new Runnable()
+ {
+ public void run()
+ {
+ queue0( packet0 );
+ }
+ } );
+ }
+ }
+ }
+ }
+
+ private void queue0(Packet packet)
+ {
+ if ( packet instanceof Packet255KickDisconnect )
+ {
+ writer.lastFlush = 0;
+ }
+
+ writer.write( channel, this, packet );
+ if ( packet instanceof Packet252KeyResponse )
+ {
+ Cipher encrypt = NettyServerConnection.getCipher( Cipher.ENCRYPT_MODE, secret );
+ channel.pipeline().addBefore( "decoder", "encrypt", new CipherEncoder( encrypt ) );
+ }
+ }
+
+ /**
+ * wakeThreads. In Vanilla this method will interrupt the network read and
+ * write threads, thus waking them.
+ */
+ public void a()
+ {
+ }
+
+ /**
+ * processPackets. Remove up to 1000 packets from the queue and process
+ * them. This method should only be called from the main server thread.
+ */
+ public void b()
+ {
+ for ( int i = 1000; !syncPackets.isEmpty() && i >= 0; i-- )
+ {
+ if ( connection instanceof PendingConnection ? ( (PendingConnection) connection ).b : ( (PlayerConnection) connection ).disconnected )
+ {
+ syncPackets.clear();
+ break;
+ }
+
+ Packet packet = PacketListener.callReceived( this, connection, syncPackets.poll() );
+ if ( packet != null )
+ {
+ packet.handle( connection );
+ }
+ }
+
+ // Disconnect via the handler - this performs all plugin related cleanup + logging
+ if ( !connected && ( dcReason != null || dcArgs != null ) )
+ {
+ connection.a( dcReason, dcArgs );
+ }
+ }
+
+ /**
+ * getSocketAddress. Return the remote address of the connected user. It is
+ * important that this method returns a value even after disconnect.
+ *
+ * @return the remote address of this connection
+ */
+ public SocketAddress getSocketAddress()
+ {
+ return address;
+ }
+
+ public void setSocketAddress(SocketAddress address)
+ {
+ this.address = address;
+ }
+
+ /**
+ * close. Close and release all resources associated with this connection.
+ */
+ public void d()
+ {
+ if ( connected )
+ {
+ connected = false;
+ channel.close();
+ }
+ }
+
+ /**
+ * queueSize. Return the number of packets in the low priority queue. In a
+ * NIO environment this will always be 0.
+ *
+ * @return the size of the packet send queue
+ */
+ public int e()
+ {
+ return 0;
+ }
+
+ /**
+ * networkShutdown. Shuts down this connection, storing the reason and
+ * parameters, used to notify the current {@link Connection}.
+ *
+ * @param reason the main disconnect reason
+ * @param arguments additional disconnect arguments, for example, the
+ * exception which triggered the disconnect.
+ */
+ public void a(String reason, Object... arguments)
+ {
+ if ( connected )
+ {
+ dcReason = reason;
+ dcArgs = arguments;
+ d();
+ }
+ }
+
+ public long getWrittenBytes()
+ {
+ return writtenBytes;
+ }
+
+ public void addWrittenBytes(int written)
+ {
+ writtenBytes += written;
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/NettyServerConnection.java b/src/main/java/org/spigotmc/netty/NettyServerConnection.java
new file mode 100644
index 0000000..7e5671d
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/NettyServerConnection.java
@@ -0,0 +1,177 @@
+package org.spigotmc.netty;
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelException;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.channel.socket.nio.NioServerSocketChannel;
+import io.netty.handler.timeout.ReadTimeoutHandler;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.security.GeneralSecurityException;
+import java.security.Key;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Level;
+import javax.crypto.Cipher;
+import javax.crypto.spec.IvParameterSpec;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.PendingConnection;
+import net.minecraft.server.ServerConnection;
+import org.bukkit.Bukkit;
+import org.spigotmc.SpigotConfig;
+
+/**
+ * This is the NettyServerConnection class. It implements
+ * {@link ServerConnection} and is the main interface between the Minecraft
+ * server and this NIO implementation. It handles starting, stopping and
+ * processing the Netty backend.
+ */
+public class NettyServerConnection extends ServerConnection
+{
+
+ private final ChannelFuture socket;
+ private static EventLoopGroup group;
+ private final Map<InetAddress, Long> throttle = new HashMap<InetAddress, Long>();
+ private final List<PendingConnection> pending = Collections.synchronizedList( new ArrayList<PendingConnection>() );
+
+ public void unThrottle(InetAddress address)
+ {
+ if ( address != null )
+ {
+ synchronized ( throttle )
+ {
+ throttle.remove( address );
+ }
+ }
+ }
+
+ public boolean throttle(InetAddress address)
+ {
+ long currentTime = System.currentTimeMillis();
+ synchronized ( throttle )
+ {
+ Long value = throttle.get( address );
+ if ( value != null && !address.isLoopbackAddress() && currentTime - value < d().server.getConnectionThrottle() )
+ {
+ throttle.put( address, currentTime );
+ return true;
+ }
+
+ throttle.put( address, currentTime );
+ }
+ return false;
+ }
+
+ public NettyServerConnection(final MinecraftServer ms, InetAddress host, int port)
+ {
+ super( ms );
+ if ( group == null )
+ {
+ group = new NioEventLoopGroup( SpigotConfig.nettyThreads, new ThreadFactoryBuilder().setNameFormat( "Netty IO Thread - %1$d" ).build() );
+ }
+
+ socket = new ServerBootstrap().channel( NioServerSocketChannel.class ).childHandler( new ChannelInitializer()
+ {
+ @Override
+ public void initChannel(Channel ch) throws Exception
+ {
+ // Check the throttle
+ if ( throttle( ( (InetSocketAddress) ch.remoteAddress() ).getAddress() ) )
+ {
+ ch.close();
+ return;
+ }
+ // Set IP_TOS
+ try
+ {
+ ch.config().setOption( ChannelOption.IP_TOS, 0x18 );
+ } catch ( ChannelException ex )
+ {
+ // IP_TOS is not supported (Windows XP / Windows Server 2003)
+ }
+ try
+ {
+ ch.config().setOption( ChannelOption.TCP_NODELAY, false );
+ } catch ( ChannelException ex )
+ {
+ // TCP_NODELAY is not supported (Mac)
+ }
+
+ NettyNetworkManager networkManager = new NettyNetworkManager();
+ ch.pipeline()
+ .addLast( "timer", new ReadTimeoutHandler( 30 ) )
+ .addLast( "decoder", new PacketDecoder() )
+ .addLast( "manager", networkManager );
+ }
+ } ).group( group ).localAddress( host, port ).bind().syncUninterruptibly();
+ }
+
+ /**
+ * Shutdown. This method is called when the server is shutting down and the
+ * server socket and all clients should be terminated with no further
+ * action.
+ */
+ @Override
+ public void a()
+ {
+ socket.channel().close().syncUninterruptibly();
+ }
+
+ @Override
+ public void b()
+ {
+ super.b(); // pulse PlayerConnections
+ for ( int i = 0; i < pending.size(); ++i )
+ {
+ PendingConnection connection = pending.get( i );
+
+ try
+ {
+ connection.d();
+ } catch ( Exception ex )
+ {
+ connection.disconnect( "Internal server error" );
+ Bukkit.getServer().getLogger().log( Level.WARNING, "Failed to handle packet: " + ex, ex );
+ }
+
+ if ( connection.b )
+ {
+ pending.remove( i-- );
+ }
+ }
+ }
+
+ public void register(PendingConnection conn)
+ {
+ pending.add( conn );
+ }
+
+ /**
+ * Return a Minecraft compatible cipher instance from the specified key.
+ *
+ * @param opMode the mode to initialize the cipher in
+ * @param key to use as the initial vector
+ * @return the initialized cipher
+ */
+ public static Cipher getCipher(int opMode, Key key)
+ {
+ try
+ {
+ Cipher cip = Cipher.getInstance( "AES/CFB8/NoPadding" );
+ cip.init( opMode, key, new IvParameterSpec( key.getEncoded() ) );
+ return cip;
+ } catch ( GeneralSecurityException ex )
+ {
+ throw new RuntimeException( ex );
+ }
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/NettySocketAdaptor.java b/src/main/java/org/spigotmc/netty/NettySocketAdaptor.java
new file mode 100644
index 0000000..5da8a59
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/NettySocketAdaptor.java
@@ -0,0 +1,294 @@
+package org.spigotmc.netty;
+
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelOption;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.net.SocketException;
+import java.nio.channels.SocketChannel;
+
+/**
+ * This class wraps a Netty {@link Channel} in a {@link Socket}. It overrides
+ * all methods in {@link Socket} to ensure that calls are not mistakingly made
+ * to the unsupported super socket. All operations that can be sanely applied to
+ * a {@link Channel} are implemented here. Those which cannot will throw an
+ * {@link UnsupportedOperationException}.
+ */
+public class NettySocketAdaptor extends Socket
+{
+
+ private final io.netty.channel.socket.SocketChannel ch;
+
+ private NettySocketAdaptor(io.netty.channel.socket.SocketChannel ch)
+ {
+ this.ch = ch;
+ }
+
+ public static NettySocketAdaptor adapt(io.netty.channel.socket.SocketChannel ch)
+ {
+ return new NettySocketAdaptor( ch );
+ }
+
+ @Override
+ public void bind(SocketAddress bindpoint) throws IOException
+ {
+ ch.bind( bindpoint ).syncUninterruptibly();
+ }
+
+ @Override
+ public synchronized void close() throws IOException
+ {
+ ch.close().syncUninterruptibly();
+ }
+
+ @Override
+ public void connect(SocketAddress endpoint) throws IOException
+ {
+ ch.connect( endpoint ).syncUninterruptibly();
+ }
+
+ @Override
+ public void connect(SocketAddress endpoint, int timeout) throws IOException
+ {
+ ch.config().setConnectTimeoutMillis( timeout );
+ ch.connect( endpoint ).syncUninterruptibly();
+ }
+
+ @Override
+ public boolean equals(Object obj)
+ {
+ return obj instanceof NettySocketAdaptor && ch.equals( ( (NettySocketAdaptor) obj ).ch );
+ }
+
+ @Override
+ public SocketChannel getChannel()
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public InetAddress getInetAddress()
+ {
+ return ch.remoteAddress().getAddress();
+ }
+
+ @Override
+ public InputStream getInputStream() throws IOException
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public boolean getKeepAlive() throws SocketException
+ {
+ return ch.config().getOption( ChannelOption.SO_KEEPALIVE );
+ }
+
+ @Override
+ public InetAddress getLocalAddress()
+ {
+ return ch.localAddress().getAddress();
+ }
+
+ @Override
+ public int getLocalPort()
+ {
+ return ch.localAddress().getPort();
+ }
+
+ @Override
+ public SocketAddress getLocalSocketAddress()
+ {
+ return ch.localAddress();
+ }
+
+ @Override
+ public boolean getOOBInline() throws SocketException
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public OutputStream getOutputStream() throws IOException
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public int getPort()
+ {
+ return ch.remoteAddress().getPort();
+ }
+
+ @Override
+ public synchronized int getReceiveBufferSize() throws SocketException
+ {
+ return ch.config().getOption( ChannelOption.SO_RCVBUF );
+ }
+
+ @Override
+ public SocketAddress getRemoteSocketAddress()
+ {
+ return ch.remoteAddress();
+ }
+
+ @Override
+ public boolean getReuseAddress() throws SocketException
+ {
+ return ch.config().getOption( ChannelOption.SO_REUSEADDR );
+ }
+
+ @Override
+ public synchronized int getSendBufferSize() throws SocketException
+ {
+ return ch.config().getOption( ChannelOption.SO_SNDBUF );
+ }
+
+ @Override
+ public int getSoLinger() throws SocketException
+ {
+ return ch.config().getOption( ChannelOption.SO_LINGER );
+ }
+
+ @Override
+ public synchronized int getSoTimeout() throws SocketException
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public boolean getTcpNoDelay() throws SocketException
+ {
+ return ch.config().getOption( ChannelOption.TCP_NODELAY );
+ }
+
+ @Override
+ public int getTrafficClass() throws SocketException
+ {
+ return ch.config().getOption( ChannelOption.IP_TOS );
+ }
+
+ @Override
+ public int hashCode()
+ {
+ return ch.hashCode();
+ }
+
+ @Override
+ public boolean isBound()
+ {
+ return ch.localAddress() != null;
+ }
+
+ @Override
+ public boolean isClosed()
+ {
+ return !ch.isOpen();
+ }
+
+ @Override
+ public boolean isConnected()
+ {
+ return ch.isActive();
+ }
+
+ @Override
+ public boolean isInputShutdown()
+ {
+ return ch.isInputShutdown();
+ }
+
+ @Override
+ public boolean isOutputShutdown()
+ {
+ return ch.isOutputShutdown();
+ }
+
+ @Override
+ public void sendUrgentData(int data) throws IOException
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public void setKeepAlive(boolean on) throws SocketException
+ {
+ ch.config().setOption( ChannelOption.SO_KEEPALIVE, on );
+ }
+
+ @Override
+ public void setOOBInline(boolean on) throws SocketException
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public void setPerformancePreferences(int connectionTime, int latency, int bandwidth)
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public synchronized void setReceiveBufferSize(int size) throws SocketException
+ {
+ ch.config().setOption( ChannelOption.SO_RCVBUF, size );
+ }
+
+ @Override
+ public void setReuseAddress(boolean on) throws SocketException
+ {
+ ch.config().setOption( ChannelOption.SO_REUSEADDR, on );
+ }
+
+ @Override
+ public synchronized void setSendBufferSize(int size) throws SocketException
+ {
+ ch.config().setOption( ChannelOption.SO_SNDBUF, size );
+ }
+
+ @Override
+ public void setSoLinger(boolean on, int linger) throws SocketException
+ {
+ ch.config().setOption( ChannelOption.SO_LINGER, linger );
+ }
+
+ @Override
+ public synchronized void setSoTimeout(int timeout) throws SocketException
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public void setTcpNoDelay(boolean on) throws SocketException
+ {
+ ch.config().setOption( ChannelOption.TCP_NODELAY, on );
+ }
+
+ @Override
+ public void setTrafficClass(int tc) throws SocketException
+ {
+ ch.config().setOption( ChannelOption.IP_TOS, tc );
+ }
+
+ @Override
+ public void shutdownInput() throws IOException
+ {
+ throw new UnsupportedOperationException( "Operation not supported on Channel wrapper." );
+ }
+
+ @Override
+ public void shutdownOutput() throws IOException
+ {
+ ch.shutdownOutput().syncUninterruptibly();
+ }
+
+ @Override
+ public String toString()
+ {
+ return ch.toString();
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/PacketDecoder.java b/src/main/java/org/spigotmc/netty/PacketDecoder.java
new file mode 100644
index 0000000..7e43b14
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/PacketDecoder.java
@@ -0,0 +1,80 @@
+package org.spigotmc.netty;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufInputStream;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.ReplayingDecoder;
+import java.io.DataInput;
+import java.io.DataInputStream;
+import java.io.EOFException;
+import java.io.IOException;
+import java.util.List;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.Packet;
+import net.minecraft.server.Packet254GetInfo;
+
+/**
+ * Packet decoding class backed by a reusable {@link DataInputStream} which
+ * backs the input {@link ByteBuf}. Reads an unsigned byte packet header and
+ * then decodes the packet accordingly.
+ */
+public class PacketDecoder extends ReplayingDecoder<ReadState>
+{
+
+ private DataInput input;
+ private Packet packet;
+ private boolean shutdown;
+
+ public PacketDecoder()
+ {
+ super( ReadState.HEADER );
+ }
+
+ @Override
+ protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception
+ {
+ if ( shutdown )
+ {
+ in.readByte(); // Discard
+ return;
+ }
+
+ if ( input == null )
+ {
+ input = new ByteBufInputStream( in );
+ }
+
+ try
+ {
+ while ( true )
+ {
+ switch ( state() )
+ {
+ case HEADER:
+ int packetId = input.readUnsignedByte();
+ packet = Packet.a( MinecraftServer.getServer().getLogger(), packetId );
+ if ( packet == null )
+ {
+ throw new IOException( "Bad packet id " + packetId );
+ }
+ checkpoint( ReadState.DATA );
+ case DATA:
+ packet.a( input );
+ checkpoint( ReadState.HEADER );
+ out.add( packet );
+ if ( packet instanceof Packet254GetInfo )
+ {
+ shutdown = true;
+ return;
+ }
+ packet = null;
+ break;
+ default:
+ throw new IllegalStateException();
+ }
+ }
+ } catch ( EOFException ex )
+ {
+ }
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/PacketListener.java b/src/main/java/org/spigotmc/netty/PacketListener.java
new file mode 100644
index 0000000..965ba12
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/PacketListener.java
@@ -0,0 +1,112 @@
+package org.spigotmc.netty;
+
+import com.google.common.base.Preconditions;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Level;
+import net.minecraft.server.Connection;
+import net.minecraft.server.INetworkManager;
+import net.minecraft.server.Packet;
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.Plugin;
+
+/**
+ * This class is used for plugins that wish to register to listen to incoming
+ * and outgoing packets. To use this class, simply create a new instance,
+ * override the methods you wish to use, and call
+ * {@link #register(org.spigotmc.netty.PacketListener, org.bukkit.plugin.Plugin)}.
+ */
+public class PacketListener
+{
+
+ /**
+ * A mapping of all registered listeners and their owning plugins.
+ */
+ private static final Map<PacketListener, Plugin> listeners = new HashMap<PacketListener, Plugin>();
+ /**
+ * A baked list of all listeners, for efficiency sake.
+ */
+ private static PacketListener[] baked = new PacketListener[ 0 ];
+
+ /**
+ * Used to register a handler for receiving notifications of packet
+ * activity.
+ *
+ * @param listener the listener to register
+ * @param plugin the plugin owning this listener
+ */
+ public static synchronized void register(PacketListener listener, Plugin plugin)
+ {
+ Preconditions.checkNotNull( listener, "listener" );
+ Preconditions.checkNotNull( plugin, "plugin" );
+ Preconditions.checkState( !listeners.containsKey( listener ), "listener already registered" );
+
+ int size = listeners.size();
+ Preconditions.checkState( baked.length == size );
+ listeners.put( listener, plugin );
+ baked = Arrays.copyOf( baked, size + 1 );
+ baked[size] = listener;
+ }
+
+ static Packet callReceived(INetworkManager networkManager, Connection connection, Packet packet)
+ {
+ for ( PacketListener listener : baked )
+ {
+ try
+ {
+ packet = listener.packetReceived( networkManager, connection, packet );
+ } catch ( Throwable t )
+ {
+ Bukkit.getServer().getLogger().log( Level.SEVERE, "Error whilst firing receive hook for packet", t );
+ }
+ }
+ return packet;
+ }
+
+ static Packet callQueued(INetworkManager networkManager, Connection connection, Packet packet)
+ {
+ for ( PacketListener listener : baked )
+ {
+ try
+ {
+ packet = listener.packetQueued( networkManager, connection, packet );
+ } catch ( Throwable t )
+ {
+ Bukkit.getServer().getLogger().log( Level.SEVERE, "Error whilst firing queued hook for packet", t );
+ }
+ }
+ return packet;
+ }
+
+ /**
+ * Called when a packet has been received and is about to be handled by the
+ * current {@link Connection}. The returned packet will be the packet passed
+ * on for handling, or in the case of null being returned, not handled at
+ * all.
+ *
+ * @param networkManager the NetworkManager receiving the packet
+ * @param connection the connection which will handle the packet
+ * @param packet the received packet
+ * @return the packet to be handled, or null to cancel
+ */
+ public Packet packetReceived(INetworkManager networkManager, Connection connection, Packet packet)
+ {
+ return packet;
+ }
+
+ /**
+ * Called when a packet is queued to be sent. The returned packet will be
+ * the packet sent. In the case of null being returned, the packet will not
+ * be sent.
+ *
+ * @param networkManager the NetworkManager which will send the packet
+ * @param connection the connection which queued the packet
+ * @param packet the queue packet
+ * @return the packet to be sent, or null if the packet will not be sent.
+ */
+ public Packet packetQueued(INetworkManager networkManager, Connection connection, Packet packet)
+ {
+ return packet;
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/PacketWriter.java b/src/main/java/org/spigotmc/netty/PacketWriter.java
new file mode 100644
index 0000000..9d947bc
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/PacketWriter.java
@@ -0,0 +1,85 @@
+package org.spigotmc.netty;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufOutputStream;
+import io.netty.channel.Channel;
+import io.netty.handler.codec.EncoderException;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.util.ArrayDeque;
+import java.util.Queue;
+import net.minecraft.server.Packet;
+import net.minecraft.server.PendingConnection;
+
+/**
+ * Netty encoder which takes a packet and encodes it, and adds a byte packet id
+ * header.
+ */
+public class PacketWriter
+{
+
+ private static final int FLUSH_TIME = 1;
+ /*========================================================================*/
+ long lastFlush;
+ private final Queue<Packet> queue = new ArrayDeque<Packet>( 64 );
+
+ void write(Channel channel, NettyNetworkManager networkManager, Packet msg)
+ {
+ // Append messages to queue
+ queue.add( msg );
+
+ // If we are not in the pending connect phase, and we have not reached our timer
+ if ( !( networkManager.connection instanceof PendingConnection ) && System.currentTimeMillis() - lastFlush < FLUSH_TIME )
+ {
+ return;
+ }
+ // Update our last write time
+ lastFlush = System.currentTimeMillis();
+
+ // Since we are writing in batches it can be useful to guess the size of our output to limit memcpy
+ int estimatedSize = 0;
+ for ( Packet packet : queue )
+ {
+ estimatedSize += packet.a();
+ }
+ // Allocate an output buffer of estimated size
+ ByteBuf outBuf = channel.alloc().buffer( estimatedSize );
+ // And a stream to which we can write this buffer to
+ DataOutput dataOut = new ByteBufOutputStream( outBuf );
+ // If we aren't a success, we free the buf in the finally
+ boolean success = false;
+
+ try
+ {
+ // Iterate through all packets, this is safe as we know we will only ever get packets in the pipeline
+ for ( Packet packet : queue )
+ {
+ // Write packet ID
+ outBuf.writeByte( packet.n() );
+ // Write packet data
+ try
+ {
+ packet.a( dataOut );
+ } catch ( IOException ex )
+ {
+ throw new EncoderException( ex );
+ }
+ }
+ // Add to the courtesy API providing number of written bytes
+ networkManager.addWrittenBytes( outBuf.readableBytes() );
+ // Let Netty handle any errors from here on
+ success = true;
+ // Write down our single ByteBuf
+ channel.writeAndFlush( outBuf );
+ } finally
+ {
+ // Reset packet queue
+ queue.clear();
+ // If Netty didn't handle the freeing because we didn't get there, we must
+ if ( !success )
+ {
+ outBuf.release();
+ }
+ }
+ }
+}
diff --git a/src/main/java/org/spigotmc/netty/ReadState.java b/src/main/java/org/spigotmc/netty/ReadState.java
new file mode 100644
index 0000000..d3a9cab
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/ReadState.java
@@ -0,0 +1,17 @@
+package org.spigotmc.netty;
+
+/**
+ * Stores the state of the packet currently being read.
+ */
+public enum ReadState
+{
+
+ /**
+ * Indicates the byte representing the ID has been read.
+ */
+ HEADER,
+ /**
+ * Shows the packet body is being read.
+ */
+ DATA;
+}
--
1.8.1.2
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