Clean up FML/handshake stuff from virtual host.

proxy/src/main/java/com/velocitypowered/proxy/connection/client/HandshakeSessionHandler.java

@@ -61,7 +61,7 @@ public class HandshakeSessionHandler implements MinecraftSessionHandler {
 
     @Override
     public boolean handle(Handshake handshake) {
-        InitialInboundConnection ic = new InitialInboundConnection(connection, handshake);
+        InitialInboundConnection ic = new InitialInboundConnection(connection, cleanVhost(handshake.getServerAddress()), handshake);
         switch (handshake.getNextStatus()) {
             case StateRegistry.STATUS_ID:
                 connection.setState(StateRegistry.STATUS);
@@ -109,6 +109,11 @@ public class HandshakeSessionHandler implements MinecraftSessionHandler {
         }
     }
 
+    private String cleanVhost(String hostname) {
+        int zeroIdx = hostname.indexOf('\0');
+        return zeroIdx == -1 ? hostname : hostname.substring(0, zeroIdx);
+    }
+
     @Override
     public void handleGeneric(MinecraftPacket packet) {
 

proxy/src/main/java/com/velocitypowered/proxy/connection/client/InitialInboundConnection.java

@@ -9,10 +9,12 @@ import java.util.Optional;
 
 class InitialInboundConnection implements InboundConnection {
     private final MinecraftConnection connection;
+    private final String cleanedAddress;
     private final Handshake handshake;
 
-    InitialInboundConnection(MinecraftConnection connection, Handshake handshake) {
+    InitialInboundConnection(MinecraftConnection connection, String cleanedAddress, Handshake handshake) {
         this.connection = connection;
+        this.cleanedAddress = cleanedAddress;
         this.handshake = handshake;
     }
 
@@ -23,7 +25,7 @@ class InitialInboundConnection implements InboundConnection {
 
     @Override
     public Optional<InetSocketAddress> getVirtualHost() {
-        return Optional.of(InetSocketAddress.createUnresolved(handshake.getServerAddress(), handshake.getPort()));
+        return Optional.of(InetSocketAddress.createUnresolved(cleanedAddress, handshake.getPort()));
     }
 
     @Override