Add server connection / proxying.

src/main/java/net/md_5/bungee/BungeeCord.java

@@ -61,7 +61,6 @@ public class BungeeCord {
     }
 
     public static void main(String[] args) throws IOException {
-        System.out.println(Util.hex(15));
         instance = new BungeeCord();
         $().info("Enabled BungeeCord version " + instance.version);
         instance.start();

src/main/java/net/md_5/bungee/Configuration.java

@@ -172,13 +172,12 @@ public class Configuration {
         }
     }
 
-    public InetSocketAddress getHostFor(String user, InetSocketAddress requestedHost) {
+    public InetSocketAddress getHostFor(String user, String requestedHost) {
-        String entry = user + ";" + Util.getAddr(requestedHost);
+        String entry = user + ";" + requestedHost;
-        String host = requestedHost.getHostString();
 
         String hostLine;
-        if (forcedServers.containsKey(host)) {
+        if (forcedServers.containsKey(requestedHost)) {
-            hostLine = servers.get(forcedServers.get(host));
+            hostLine = servers.get(forcedServers.get(requestedHost));
         } else {
             hostLine = reconnectLocations.get(entry);
         }
@@ -188,8 +187,13 @@ public class Configuration {
         return Util.getAddr(hostLine);
     }
 
+    public void setHostFor(UserConnection user, String host) {
+        String entry = user.username + ";" + Util.getAddr(user.handshake.host);
+        reconnectLocations.put(entry, host);
+    }
+
     public InetSocketAddress getServer(String name) {
-        String hostline = servers.get(name);
+        String hostline = (name == null) ? defaultServerName : name;
         if (hostline != null) {
             return Util.getAddr(hostline);
         } else {

src/main/java/net/md_5/bungee/GenericConnection.java

@@ -5,6 +5,7 @@ import java.io.OutputStream;
 import java.net.Socket;
 import lombok.EqualsAndHashCode;
 import lombok.RequiredArgsConstructor;
+import static net.md_5.bungee.Logger.$;
 import net.md_5.bungee.packet.PacketFFKick;
 import net.md_5.bungee.packet.PacketInputStream;
 
@@ -12,13 +13,18 @@ import net.md_5.bungee.packet.PacketInputStream;
 @RequiredArgsConstructor
 public class GenericConnection {
 
-    private final Socket socket;
+    protected final Socket socket;
-    private final PacketInputStream in;
+    protected final PacketInputStream in;
-    private final OutputStream out;
+    protected final OutputStream out;
+    public String username;
 
     public void disconnect(String reason) {
+        if (socket.isClosed()) {
+            return;
+        }
+        log("disconnected with " + reason);
         try {
-            out.write(new PacketFFKick(reason).getPacket());
+            out.write(new PacketFFKick("[Proxy] " + reason).getPacket());
         } catch (IOException ex) {
         } finally {
             try {
@@ -28,4 +34,8 @@ public class GenericConnection {
             }
         }
     }
+
+    public void log(String message) {
+        $().info(socket.getInetAddress() + ((username == null) ? " " : " [" + username + "] ") + message);
+    }
 }

src/main/java/net/md_5/bungee/InitialHandler.java

@@ -44,13 +44,16 @@ public class InitialHandler implements Runnable {
 
                     out.write(new PacketFCEncryptionResponse().getPacket());
                     in = new PacketInputStream(new CipherInputStream(socket.getInputStream(), EncryptionUtil.getCipher(false, shared)));
-                    out = new BufferedOutputStream(new CipherOutputStream(socket.getOutputStream(), EncryptionUtil.getCipher(true, shared)), 5120);
+                    out = new CipherOutputStream(socket.getOutputStream(), EncryptionUtil.getCipher(true, shared));
 
                     int ciphId = Util.getId(in.readPacket());
                     if (ciphId != 0xCD) {
                         throw new KickException("Unable to receive encrypted client status");
                     }
 
+                    UserConnection userCon = new UserConnection(socket, in, out, handshake);
+                    userCon.register();
+                    userCon.connect(BungeeCord.instance.config.getHostFor(handshake.username, handshake.host));
                     break;
                 case 0xFE:
                     throw new KickException(BungeeCord.instance.config.motd + ChatColor.COLOR_CHAR + BungeeCord.instance.connections.size() + ChatColor.COLOR_CHAR + BungeeCord.instance.config.maxPlayers);
@@ -70,16 +73,10 @@ public class InitialHandler implements Runnable {
         } catch (IOException ioe) {
         } finally {
             try {
+                out.flush();
                 socket.close();
             } catch (IOException ioe2) {
             }
         }
     }
-
-    private class KickException extends RuntimeException {
-
-        public KickException(String message) {
-            super(message);
-        }
-    }
 }

src/main/java/net/md_5/bungee/KickException.java

@@ -0,0 +1,8 @@
+package net.md_5.bungee;
+
+public class KickException extends RuntimeException {
+
+    public KickException(String message) {
+        super(message);
+    }
+}

src/main/java/net/md_5/bungee/ServerConnection.java

@@ -10,20 +10,22 @@ import net.md_5.bungee.packet.Packet2Handshake;
 import net.md_5.bungee.packet.PacketCDClientStatus;
 import net.md_5.bungee.packet.PacketFCEncryptionResponse;
 import net.md_5.bungee.packet.PacketFDEncryptionRequest;
+import net.md_5.bungee.packet.PacketFFKick;
 import net.md_5.bungee.packet.PacketInputStream;
 import org.bouncycastle.crypto.io.CipherInputStream;
 import org.bouncycastle.crypto.io.CipherOutputStream;
 
 public class ServerConnection extends GenericConnection {
 
-    private final Packet1Login loginPacket;
+    public final Packet1Login loginPacket;
 
     public ServerConnection(Socket socket, PacketInputStream in, OutputStream out, Packet1Login loginPacket) {
         super(socket, in, out);
         this.loginPacket = loginPacket;
     }
 
-    public static ServerConnection connect(InetSocketAddress address, Packet2Handshake handshake) throws Exception {
+    public static ServerConnection connect(InetSocketAddress address, Packet2Handshake handshake, boolean retry) {
+        try {
             Socket socket = new Socket();
             socket.connect(address, BungeeCord.instance.config.timeout);
             BungeeCord.instance.setSocketOptions(socket);
@@ -38,6 +40,7 @@ public class ServerConnection extends GenericConnection {
             PublicKey pub = EncryptionUtil.getPubkey(encryptRequest);
 
             PacketFCEncryptionResponse response = new PacketFCEncryptionResponse(EncryptionUtil.getShared(myKey, pub), EncryptionUtil.encrypt(pub, encryptRequest.verifyToken));
+            out.write(response.getPacket());
 
             int ciphId = Util.getId(in.readPacket());
             if (ciphId != 0xFC) {
@@ -48,8 +51,22 @@ public class ServerConnection extends GenericConnection {
             out = new CipherOutputStream(out, EncryptionUtil.getCipher(true, myKey));
 
             out.write(new PacketCDClientStatus((byte) 0).getPacket());
-        Packet1Login login = new Packet1Login(in.readPacket());
+            byte[] loginResponse = in.readPacket();
+            if (Util.getId(loginResponse) == 0xFF) {
+                throw new KickException("[Kicked] " + new PacketFFKick(loginResponse).message);
+            }
+            Packet1Login login = new Packet1Login(loginResponse);
 
             return new ServerConnection(socket, in, out, login);
+        } catch (KickException ex) {
+            throw ex;
+        } catch (Exception ex) {
+            InetSocketAddress def = BungeeCord.instance.config.getServer(null);
+            if (retry && address != def) {
+                return connect(def, handshake, false);
+            } else {
+                throw new RuntimeException("Could not connect to target server");
+            }
+        }
     }
 }

src/main/java/net/md_5/bungee/UserConnection.java

@@ -1,16 +1,115 @@
 package net.md_5.bungee;
 
+import java.io.IOException;
 import java.io.OutputStream;
+import java.net.InetSocketAddress;
 import java.net.Socket;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import net.md_5.bungee.packet.DefinedPacket;
 import net.md_5.bungee.packet.Packet2Handshake;
+import net.md_5.bungee.packet.Packet3Chat;
 import net.md_5.bungee.packet.PacketInputStream;
 
 public class UserConnection extends GenericConnection {
 
-    private final Packet2Handshake handshake;
+    public final Packet2Handshake handshake;
+    public Queue<DefinedPacket> packetQueue = new ConcurrentLinkedQueue<>();
+    private ServerConnection server;
+    private UpstreamBridge upBridge;
+    private DownstreamBridge downBridge;
 
     public UserConnection(Socket socket, PacketInputStream in, OutputStream out, Packet2Handshake handshake) {
         super(socket, in, out);
         this.handshake = handshake;
+        username = handshake.username;
+    }
+
+    public void connect(InetSocketAddress serverAddr) {
+        try {
+            ServerConnection newServer = ServerConnection.connect(serverAddr, handshake, true);
+            if (server == null) {
+                out.write(newServer.loginPacket.getPacket());
+                upBridge = new UpstreamBridge();
+                upBridge.start();
+            }
+            if (downBridge != null) {
+                downBridge.interrupt();
+            }
+            downBridge = new DownstreamBridge();
+            server = newServer;
+            downBridge.start();
+        } catch (KickException ex) {
+            destory(ex.getMessage());
+        } catch (Exception ex) {
+            if (server == null) {
+                destory("Could not connect to server");
+            } else {
+                packetQueue.add(new Packet3Chat(ChatColor.YELLOW + "The server you selected is not up at the moment."));
+            }
+        }
+    }
+
+    public void register() {
+        BungeeCord.instance.connections.put(username, this);
+    }
+
+    private void destory(String reason) {
+        if (BungeeCord.instance.isRunning) {
+            BungeeCord.instance.connections.remove(username);
+        }
+        if (upBridge != null) {
+            upBridge.interrupt();
+        }
+        if (downBridge != null) {
+            downBridge.interrupt();
+        }
+        disconnect(reason);
+        if (server != null) {
+            server.disconnect("Quitting");
+        }
+    }
+
+    private class UpstreamBridge extends Thread {
+
+        public UpstreamBridge() {
+            super("Upstream Bridge - " + username);
+        }
+
+        @Override
+        public void run() {
+            while (!interrupted()) {
+                try {
+                    byte[] packet = in.readPacket();
+                    server.out.write(packet);
+                } catch (IOException ex) {
+                    destory("Reached end of stream");
+                } catch (Exception ex) {
+                    destory(Util.exception(ex));
+                }
+            }
+        }
+    }
+
+    private class DownstreamBridge extends Thread {
+
+        public DownstreamBridge() {
+            super("Downstream Bridge - " + username);
+        }
+
+        @Override
+        public void run() {
+            while (!interrupted()) {
+                try {
+                    byte[] packet = server.in.readPacket();
+                    out.write(packet);
+                    out.flush();
+                } catch (IOException ex) {
+                    destory("Reached end of stream");
+                } catch (Exception ex) {
+                    destory(Util.exception(ex));
+                }
+            }
+        }
     }
 }

src/main/java/net/md_5/bungee/Util.java

@@ -15,9 +15,6 @@ public class Util {
      */
     public static InetSocketAddress getAddr(String hostline) {
         String[] split = hostline.split(":");
-        if (split.length < 2) {
-            throw new IllegalArgumentException("Invalid split format");
-        }
         int port = DEFAULT_PORT;
         if (split.length > 1) {
             port = Integer.parseInt(split[1]);

src/main/java/net/md_5/bungee/packet/PacketInputStream.java

@@ -2,6 +2,7 @@ package net.md_5.bungee.packet;
 
 import java.io.ByteArrayOutputStream;
 import java.io.DataInputStream;
+import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
 import net.md_5.bungee.Util;
@@ -20,6 +21,9 @@ public class PacketInputStream {
     public byte[] readPacket() throws IOException {
         tracker.out.reset();
         int id = tracker.read();
+        if (id == -1) {
+            throw new EOFException();
+        }
         Packet codec = VanillaPackets.packets[id];
         if (codec == null) {
             throw new RuntimeException("No Packet id: " + Util.hex(id));