package net.md_5.bungee.forge;

import net.md_5.bungee.UserConnection;
import net.md_5.bungee.forge.ForgeLogger.LogDirection;
import net.md_5.bungee.netty.ChannelWrapper;
import net.md_5.bungee.protocol.packet.PluginMessage;

/**
 * Handshake sequence manager for the Bungee - Forge Server (Downstream/Server
 * Connector) link. Modelled after the Forge implementation.
 */
public enum ForgeServerHandshakeState implements IForgeServerPacketHandler<ForgeServerHandshakeState>
{

    /**
     * Start the handshake.
     *
     */
    START
            {
                @Override
                public ForgeServerHandshakeState handle(PluginMessage message, ChannelWrapper ch)
                {
                    ForgeLogger.logServer( LogDirection.RECEIVED, this.name(), message );
                    ch.write( message );
                    return this;
                }

                @Override
                public ForgeServerHandshakeState send(PluginMessage message, UserConnection con)
                {
                    // Send custom channel registration. Send Hello.
                    return HELLO;
                }
            },
    HELLO
            {

                @Override
                public ForgeServerHandshakeState handle(PluginMessage message, ChannelWrapper ch)
                {
                    ForgeLogger.logServer( LogDirection.RECEIVED, this.name(), message );
                    if ( message.getData()[0] == 1 ) // Client Hello
                    {
                        ch.write( message );
                    }

                    if ( message.getData()[0] == 2 ) // Client ModList
                    {
                        ch.write( message );
                    }

                    return this;
                }

                @Override
                public ForgeServerHandshakeState send(PluginMessage message, UserConnection con)
                {
                    // Send Server Mod List.
                    return WAITINGCACK;
                }
            },
    WAITINGCACK
            {

                @Override
                public ForgeServerHandshakeState handle(PluginMessage message, ChannelWrapper ch)
                {
                    ForgeLogger.logServer( LogDirection.RECEIVED, this.name(), message );
                    ch.write( message );
                    return this;
                }

                @Override
                public ForgeServerHandshakeState send(PluginMessage message, UserConnection con)
                {
                    if ( message.getData()[0] == 3 && message.getTag().equals( ForgeConstants.FML_HANDSHAKE_TAG ) )
                    {
                        con.getForgeClientHandler().setServerIdList( message );
                        return this;
                    }

                    if ( message.getData()[0] == -1 && message.getTag().equals( ForgeConstants.FML_HANDSHAKE_TAG ) ) // transition to COMPLETE after sending ACK
                    {
                        return this;
                    }

                    if ( message.getTag().equals( ForgeConstants.FORGE_REGISTER ) ) // wait for Forge channel registration
                    {
                        return COMPLETE;
                    }

                    return this;
                }
            },
    COMPLETE
            {

                @Override
                public ForgeServerHandshakeState handle(PluginMessage message, ChannelWrapper ch)
                {
                    // Wait for ACK
                    ForgeLogger.logServer( LogDirection.RECEIVED, this.name(), message );
                    ch.write( message );
                    return this;
                }

                @Override
                public ForgeServerHandshakeState send(PluginMessage message, UserConnection con)
                {
                    // Send ACK
                    return DONE;
                }

            },
    /**
     * Handshake has been completed. Do not respond to any more handshake
     * packets.
     */
    DONE
            {

                @Override
                public ForgeServerHandshakeState handle(PluginMessage message, ChannelWrapper ch)
                {
                    // RECEIVE 2 ACKS
                    ForgeLogger.logServer( LogDirection.RECEIVED, this.name(), message );
                    ch.write( message );
                    return this;
                }

                @Override
                public ForgeServerHandshakeState send(PluginMessage message, UserConnection con)
                {
                    return this;
                }
            }
}

@@ -1005,32 +1005,278 @@
               %7B%0A
+                    // Packets should never make it here but if they ever do, pass everything to client%0A                    ForgeLogger.logServer( LogDirection.SENDING, this.name(), message);%0A                    con.unsafe().sendPacket(message);%0A
                 

Update ForgeServerHandshakeState.java