Update README.md

Refactoring AmbassadorConfig

README.md

@@ -3,7 +3,8 @@
 This is a Velocity plugin that makes it possible to host a modern Forge server behind a Velocity proxy!
 
 Unlike other solutions, this plugin does not require any special modifications to the backend server nor the client. (The player doesn't need to do anything)
-
+## Only for 1.13-1.20.1
+Velocity has now added built-in support for newer mc versions and therefore don't need Ambassador. You might still need PCF mod on the server-side, for more info please visit: https://github.com/adde0109/Proxy-Compatible-Forge
 ## How to get started:
 1. Download and install this plugin to your proxy.
 2. After starting the server, configure the plugin it to your liking using the config file found in the folder "Ambassador".
@@ -13,12 +14,13 @@ Unlike other solutions, this plugin does not require any special modifications t
 - https://github.com/caunt/BungeeForge (Legacy forwarding)
 
 ## Features
-* Server switching using kick to reset the client with configureble message and switch timeout.
-* ServerRedirect support for auto-reconnecting during switch.
-* Server switching using client mod for instant server switching: 
-https://github.com/Just-Chaldea/Forge-Client-Reset-Packet 
-1.18.2 and 1.19 fork:
-https://github.com/adde0109/Forge-Client-Reset-Packet
+* Server switching without any client side mod when the servers are similar. (Mods must match)
+* ServerRedirect support for server switching.
+* Server switching using Client Reset Packet Mod for instant server switching:
+  
+1.16.5: https://github.com/Just-Chaldea/Forge-Client-Reset-Packet
+
+1.18.2+: https://www.curseforge.com/minecraft/mc-mods/forge-client-reset-packet-forward
 
 ## Stuck on "Negotiating":
 This is an issue with Client Reset Packet Mod being partly incompatible with certain mods on the client. Please remove incompatible mods on the client if you have this issue. (Yes, this also includes client-side only mods.)

build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 }
 
 group = "org.adde0109"
-version = "1.5.0-rc1"
+version = "1.5.3-beta"
 
 repositories {
     mavenCentral()

src/main/java/org/adde0109/ambassador/Ambassador.java

@@ -19,6 +19,7 @@ import java.util.Map;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import com.velocitypowered.proxy.VelocityServer;
 import com.velocitypowered.proxy.connection.MinecraftConnection;
+import com.velocitypowered.proxy.connection.client.ConnectedPlayer;
 import com.velocitypowered.proxy.network.ConnectionManager;
 import com.velocitypowered.proxy.protocol.StateRegistry;
 import com.velocitypowered.proxy.protocol.packet.DisconnectPacket;
@@ -28,6 +29,8 @@ import com.velocitypowered.proxy.protocol.packet.brigadier.ArgumentPropertySeria
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelInitializer;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
 import org.adde0109.ambassador.velocity.VelocityBackendChannelInitializer;
 import org.adde0109.ambassador.velocity.VelocityServerChannelInitializer;
 import org.adde0109.ambassador.velocity.VelocityEventHandler;
@@ -43,7 +46,7 @@ import java.util.concurrent.TimeUnit;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_19;
 import static com.velocitypowered.proxy.protocol.packet.brigadier.ArgumentIdentifier.mapSet;
 
-@Plugin(id = "ambassador", name = "Ambassador", version = "1.5.0-rc1", authors = {"adde0109"})
+@Plugin(id = "ambassador", name = "Ambassador", version = "1.5.3-beta", authors = {"adde0109"})
 public class Ambassador {
 
   //Don't forget to update checkCompatibleVersion() when changing this value
@@ -153,6 +156,16 @@ public class Ambassador {
     return TEMPORARY_FORCED;
   }
 
+  public void reconnectSwitchPlayer(ConnectedPlayer player) {
+    TEMPORARY_FORCED.put(player.getUsername(), player.getConnectionInFlight().getServer(),
+            config.getServerSwitchCancellationTime(), TimeUnit.SECONDS);
+
+    MiniMessage mm = MiniMessage.miniMessage();
+    Component parsed = mm.deserialize(config.getKickReconnectMessageString());
+
+    player.disconnect(parsed);
+  }
+
   private void initMetrics() {
     Metrics metrics = metricsFactory.make(this, 15655);
   }

src/main/java/org/adde0109/ambassador/AmbassadorConfig.java

@@ -19,7 +19,6 @@ public class AmbassadorConfig {
 
     @Expose
     private boolean silenceWarnings = false;
-
     @Expose
     private boolean bypassRegistryCheck = false;
     @Expose
@@ -28,12 +27,21 @@ public class AmbassadorConfig {
     @Expose
     private boolean debugMode = false;
 
-  private AmbassadorConfig(boolean silenceWarnings, boolean bypassRegistryCheck, boolean bypassModCheck, boolean debugMode) {
+    @Expose
+    private boolean enableKickReset = false;
+
+    @Expose
+    private String kickReconnectMessageString = "<red>Please reconnect.</red>";
+
+    private AmbassadorConfig(boolean silenceWarnings, boolean bypassRegistryCheck, boolean bypassModCheck,
+                             boolean debugMode, boolean enableKickReset, String kickReconnectMessageString) {
         this.silenceWarnings = silenceWarnings;
         this.bypassRegistryCheck = bypassRegistryCheck;
         this.bypassModCheck = bypassModCheck;
         this.debugMode = debugMode;
-  };
+        this.enableKickReset = enableKickReset;
+        this.kickReconnectMessageString = kickReconnectMessageString;
+    }
 
     public static AmbassadorConfig read(Path path) throws IOException {
         URL defaultConfigLocation = AmbassadorConfig.class.getClassLoader()
@@ -59,8 +67,19 @@ public class AmbassadorConfig {
 
         boolean silenceWarnings = config.getOrElse("silence-warnings", false);
 
+        int serverSwitchCancellationTime = config.getOrElse("serverRedirectTimeout", 30);
+
+        boolean bypassRegistryCheck = config.getOrElse("bypass-registry-checks", false);
+
+        boolean bypassModCheck = config.getOrElse("bypass-mod-checks", false);
+
+        boolean debugMode = config.getOrElse("debug-mode", false);
+
+        String kickReconnectMessageString = config.getOrElse("disconnect-reset-message",
+                config.getOrElse("reconnect-message", "<red>Please reconnect.</red>"));
+
         //Upgrade config
-    if (configVersion <= 1.2) {
+        if (configVersion <= 2.0) {
             Files.delete(path);
             config = CommentedFileConfig.builder(path)
                     .defaultData(defaultConfigLocation)
@@ -70,17 +89,17 @@ public class AmbassadorConfig {
                     .build();
             config.load();
             config.set("silence-warnings", silenceWarnings);
+            config.set("serverRedirectTimeout", serverSwitchCancellationTime);
+            config.set("bypass-registry-checks", bypassRegistryCheck);
+            config.set("bypass-mod-checks", bypassModCheck);
+            config.set("debug-mode", debugMode);
+            config.set("reconnect-message", kickReconnectMessageString);
         }
 
-    int serverSwitchCancellationTime = config.getOrElse("serverRedirectTimeout", 30);
+        boolean enableKickReset = config.getOrElse("enable-kick-reset", false);
 
-    boolean bypassRegistryCheck = config.getOrElse("bypass-registry-checks", false);
-
-    boolean bypassModCheck = config.getOrElse("bypass-mod-checks", false);
-
-    boolean debugMode = config.getOrElse("debug-mode", false);
-
-    return new AmbassadorConfig(bypassRegistryCheck, bypassModCheck, silenceWarnings, debugMode);
+        return new AmbassadorConfig(silenceWarnings, bypassRegistryCheck, bypassModCheck,
+                debugMode, enableKickReset, kickReconnectMessageString);
     }
 
     public int getServerSwitchCancellationTime() {
@@ -102,4 +121,12 @@ public class AmbassadorConfig {
     public boolean isDebugMode() {
         return debugMode;
     }
+
+    public boolean isEnableKickReset() {
+        return enableKickReset;
+    }
+
+    public String getKickReconnectMessageString() {
+        return kickReconnectMessageString;
+    }
 }

src/main/java/org/adde0109/ambassador/forge/ForgeHandshake.java

@@ -1,5 +1,7 @@
 package org.adde0109.ambassador.forge;
 
+import org.adde0109.ambassador.forge.packet.Context;
+import org.adde0109.ambassador.forge.packet.GenericForgeLoginWrapperPacket;
 import org.adde0109.ambassador.forge.packet.ModListReplyPacket;
 import org.adde0109.ambassador.forge.packet.RegistryPacket;
 
@@ -11,6 +13,7 @@ import java.util.zip.Checksum;
 public class ForgeHandshake {
     private ModListReplyPacket modListReplyPacket;
     private final Map<String, Long> registries = new HashMap<>();
+    public GenericForgeLoginWrapperPacket<Context.ClientContext> zetaFlagsPacket;
 
     public ForgeHandshake() {
     }

src/main/java/org/adde0109/ambassador/forge/ForgeHandshakeUtils.java

@@ -6,8 +6,8 @@ import com.google.common.io.ByteStreams;
 import com.velocitypowered.proxy.protocol.ProtocolUtils;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
-import io.netty.handler.codec.DecoderException;
 import org.adde0109.ambassador.forge.packet.Context;
+import org.adde0109.ambassador.forge.packet.GenericForgeLoginWrapperPacket;
 import org.adde0109.ambassador.forge.packet.IForgeLoginWrapperPacket;
 
 import java.nio.charset.StandardCharsets;
@@ -117,30 +117,52 @@ public class ForgeHandshakeUtils {
     return stream.toByteArray();
   }
 
-  public static class SilentGearUtils {
-    public static boolean isSilentGearPacket(byte[] data) {
-      ByteBuf buf = Unpooled.wrappedBuffer(data);
-      String channel = null;
-      try {
-        channel = ProtocolUtils.readString(buf);
-      } catch (DecoderException e) {
-      } finally {
-        buf.release();
-      }
-      return channel != null && channel.equals("silentgear:network");
-    }
+  public static class ThirdPartyRegistryUtils {
 
-    public static class ACKPacket implements IForgeLoginWrapperPacket<Context.ClientContext> {
-      private final Context.ClientContext context;
-
-      public ACKPacket(Context.ClientContext context) {
-        this.context = context;
-      }
+    static enum ThirdPartyChannel {
+      SILENTGEAR_NETWORK {
         @Override
+        public IForgeLoginWrapperPacket<Context.ClientContext> generateResponsePacket(Context.ClientContext context, ForgeHandshake completed) {
+          return new ACKPacket(context, 3);
+        }
+      },
+      ZETA_MAIN {
+        @Override
+        public IForgeLoginWrapperPacket<Context.ClientContext> generateResponsePacket(Context.ClientContext context, ForgeHandshake completed) {
+          return new GenericForgeLoginWrapperPacket<Context.ClientContext>(completed.zetaFlagsPacket.getContent(), context);
+        }
+      };
+      abstract public IForgeLoginWrapperPacket<Context.ClientContext> generateResponsePacket(Context.ClientContext context, ForgeHandshake completed);
+    }
+
+    static boolean isThirdPartyPacket(GenericForgeLoginWrapperPacket<Context> packet) {
+      try {
+        Enum.valueOf(ThirdPartyChannel.class,
+                packet.getContext().getChannelName().replace(':', '_').toUpperCase());
+        return true;
+      } catch (IllegalArgumentException e) {
+        return false;
+      }
+    }
+
+    static ThirdPartyChannel getThirdPartyChannel(GenericForgeLoginWrapperPacket<Context> packet) {
+      return Enum.valueOf(ThirdPartyChannel.class,
+              packet.getContext().getChannelName().replace(':', '_').toUpperCase());
+    }
+
+    static class ACKPacket implements IForgeLoginWrapperPacket<Context.ClientContext> {
+
+      private final Context.ClientContext context;
+      private final int packetID;
+      ACKPacket(Context.ClientContext context, int packetID) {
+        this.context = context;
+        this.packetID = packetID;
+      }
+
       public ByteBuf encode() {
         ByteBuf buf = Unpooled.buffer();
 
-        ProtocolUtils.writeVarInt(buf, 3);
+        ProtocolUtils.writeVarInt(buf, packetID);
 
         return buf;
       }

src/main/java/org/adde0109/ambassador/forge/VelocityForgeBackendConnectionPhase.java

@@ -62,7 +62,7 @@ public enum VelocityForgeBackendConnectionPhase implements BackendConnectionPhas
   VelocityForgeBackendConnectionPhase() {
   }
 
-  public void handle(VelocityServerConnection server, ConnectedPlayer player, IForgeLoginWrapperPacket message) {
+  public void handle(VelocityServerConnection server, ConnectedPlayer player, IForgeLoginWrapperPacket<Context> message) {
     VelocityForgeBackendConnectionPhase newPhase = getNewPhase(server,message);
 
     server.setConnectionPhase(newPhase);
@@ -72,6 +72,10 @@ public enum VelocityForgeBackendConnectionPhase implements BackendConnectionPhas
     VelocityForgeClientConnectionPhase clientPhase = (VelocityForgeClientConnectionPhase) player.getPhase();
 
 
+    if (!player.isActive()) {
+      return;
+    }
+
     if (!clientPhase.consideredComplete()) {
       //Initial Forge
       if (message instanceof ModListPacket modListPacket) {
@@ -92,10 +96,16 @@ public enum VelocityForgeBackendConnectionPhase implements BackendConnectionPhas
 
       if (clientPhase.forgeHandshake.getModListReplyPacket() == null) {
         //We have nothing to respond with during this handshake. Unable to proceed.
-        Ambassador.getInstance().logger.error("Unable for {} to switch servers. " +
-                "Vanilla({}) -> Forge({}) switch without reset is not yet supported!", player.getGameProfile().getName(),
-                player.getConnectedServer().getServerInfo().getName(), server.getServerInfo().getName());
+        if (Ambassador.getInstance().config.isEnableKickReset()) {
+          //Kick-reset
+          Ambassador.getInstance().reconnectSwitchPlayer(player);
+        } else {
+          Ambassador.getInstance().logger.error("Unable for {} to switch servers. Vanilla({}) -> Forge({}) switch " +
+                          "without client side mod or kick-reset enabled is not yet supported!",
+                  player.getGameProfile().getName(), player.getConnectedServer().getServerInfo().getName(),
+                  server.getServerInfo().getName());
           server.disconnect();
+        }
         return;
       }
 
@@ -124,6 +134,9 @@ public enum VelocityForgeBackendConnectionPhase implements BackendConnectionPhas
           if (Ambassador.getInstance().config.isBypassRegistryCheck() ||
                   clientPhase.forgeHandshake.isCompatible(handshake)) {
             server.ensureConnected().write(clientPhase.forgeHandshake.getModListReplyPacket());
+          } else if (Ambassador.getInstance().config.isEnableKickReset()) {
+            //Kick-reset
+            Ambassador.getInstance().reconnectSwitchPlayer(player);
           } else {
             Ambassador.getInstance().logger.error("Unable to switch due to the registries of " +
                     server.getServer().getServerInfo().getName() + " being different from the registries of " +
@@ -137,10 +150,13 @@ public enum VelocityForgeBackendConnectionPhase implements BackendConnectionPhas
         remainingRegistries.countDown();
       } else if (message instanceof ConfigDataPacket) {
         server.getConnection().write(new ACKPacket(Context.fromContext(message.getContext(), true)));
-      } else if (message instanceof GenericForgeLoginWrapperPacket<?> packet
-              && ForgeHandshakeUtils.SilentGearUtils.isSilentGearPacket(packet.getContent())) {
-        server.getConnection().write(new ForgeHandshakeUtils.SilentGearUtils.ACKPacket(
-                Context.fromContext(message.getContext(), true)));
+      } else if (message instanceof GenericForgeLoginWrapperPacket<Context> packet
+              && ForgeHandshakeUtils.ThirdPartyRegistryUtils.isThirdPartyPacket(packet)) {
+          server.getConnection().write(
+                  ForgeHandshakeUtils.ThirdPartyRegistryUtils.getThirdPartyChannel(packet).
+                          generateResponsePacket(
+                                  Context.ClientContext.fromContext(packet.getContext(), true),
+                                  clientPhase.forgeHandshake));
       }
     }
     //Forge server

src/main/java/org/adde0109/ambassador/forge/VelocityForgeClientConnectionPhase.java

@@ -17,6 +17,7 @@ import io.netty.buffer.Unpooled;
 import net.kyori.adventure.text.Component;
 import org.adde0109.ambassador.Ambassador;
 import org.adde0109.ambassador.forge.packet.Context;
+import org.adde0109.ambassador.forge.packet.GenericForgeLoginWrapperPacket;
 import org.adde0109.ambassador.forge.packet.IForgeLoginWrapperPacket;
 import org.adde0109.ambassador.forge.packet.ModListReplyPacket;
 import org.adde0109.ambassador.velocity.client.FML2CRPMResetCompleteDecoder;
@@ -24,6 +25,7 @@ import org.adde0109.ambassador.velocity.client.OutboundSuccessHolder;
 import org.adde0109.ambassador.velocity.client.ClientPacketQueue;
 
 import java.nio.charset.StandardCharsets;
+import java.util.concurrent.TimeUnit;
 
 public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase {
 
@@ -129,6 +131,10 @@ public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase
 
   public boolean handle(ConnectedPlayer player, IForgeLoginWrapperPacket<Context.ClientContext> msg, VelocityServerConnection server) {
 
+    if (msg.getContext().getChannelName().equals("zeta:main")) {
+      forgeHandshake.zetaFlagsPacket = (GenericForgeLoginWrapperPacket<Context.ClientContext>) msg;
+    }
+
     if (msg instanceof ModListReplyPacket replyPacket) {
       ModInfo modInfo = new ModInfo("FML2", replyPacket.getMods().stream().map(
               (v) -> new ModInfo.Mod(v,"1")).toList());
@@ -250,6 +256,8 @@ public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase
         buf.writeBytes((player.getVirtualHost().get().getHostName() + ":"
                 + player.getVirtualHost().get().getPort()).getBytes(StandardCharsets.UTF_8));
         player.getConnection().write(new PluginMessagePacket("srvredirect:red", buf));
+
+        Ambassador.getInstance().reconnectSwitchPlayer(player);
       }
     };
 

src/main/java/org/adde0109/ambassador/forge/packet/Context.java

@@ -4,31 +4,38 @@ public class Context {
 
   private final int responseID;
 
-  private Context(int responseID) {
+  private final String channelName;
+
+  private Context(int responseID, String channelName) {
     this.responseID = responseID;
+      this.channelName = channelName;
   }
 
-  public static Context createContext(int responseID) {
-    return new Context(responseID);
+  public static Context createContext(int responseID, String channelName) {
+    return new Context(responseID, channelName);
   }
 
-  public static ClientContext createClientContext(int responseID, boolean clientSuccess) {
-    return new ClientContext(responseID,clientSuccess);
+  public static ClientContext createClientContext(int responseID, boolean clientSuccess, String channelName) {
+    return new ClientContext(responseID, clientSuccess, channelName);
   }
 
   public static ClientContext fromContext(Context context, boolean clientSuccess) {
-    return new ClientContext(context.responseID,clientSuccess);
+    return new ClientContext(context.responseID, clientSuccess, context.channelName);
   }
 
   public int getResponseID() {
     return responseID;
   }
 
+  public String getChannelName() {
+    return channelName;
+  }
+
   public static class ClientContext extends Context {
 
     private final boolean clientSuccess;
-    ClientContext(int responseID, boolean clientSuccess) {
-      super(responseID);
+    ClientContext(int responseID, boolean clientSuccess, String channelName) {
+      super(responseID, channelName);
       this.clientSuccess = clientSuccess;
     }
 

src/main/java/org/adde0109/ambassador/forge/packet/GenericForgeLoginWrapperPacket.java

@@ -8,7 +8,7 @@ public class GenericForgeLoginWrapperPacket<T extends Context> implements IForge
   private final byte[] content;
   private final T context;
 
-  GenericForgeLoginWrapperPacket(byte[] content, T context) {
+  public GenericForgeLoginWrapperPacket(byte[] content, T context) {
     this.content = content;
     this.context = context;
   }

src/main/java/org/adde0109/ambassador/forge/packet/ModDataPacket.java

@@ -1,10 +1,39 @@
 package org.adde0109.ambassador.forge.packet;
 
+import com.velocitypowered.proxy.protocol.ProtocolUtils;
 import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
 
-public class ModDataPacket extends GenericForgeLoginWrapperPacket<Context> {
+public class ModDataPacket implements IForgeLoginWrapperPacket<Context> {
+  private final byte[] content;
+  private final Context context;
 
   ModDataPacket(byte[] content, Context context) {
-    super(content, context);
+    this.content = content;
+    this.context = context;
+  }
+
+
+  static public ModDataPacket read(ByteBuf input, Context context) {
+    byte[] content = new byte[input.readableBytes()];
+    input.readBytes(content);
+    return new ModDataPacket(content, context);
+  }
+
+  @Override
+  public ByteBuf encode() {
+    ByteBuf buf = Unpooled.buffer();
+    ProtocolUtils.writeVarInt(buf, 5); //PacketID
+    buf.writeBytes(content);
+    return buf;
+  }
+
+  public byte[] getContent() {
+    return content;
+  }
+
+  @Override
+  public Context getContext() {
+    return context;
   }
 }

src/main/java/org/adde0109/ambassador/forge/packet/ModListPacket.java

@@ -46,7 +46,7 @@ public class ModListPacket implements IForgeLoginWrapperPacket<Context> {
             registries.add(ProtocolUtils.readString(input, 32767));
 
         List<String> dataPackRegistries = null;
-        if (FML3) {
+        if (FML3 && input.isReadable()) {
             dataPackRegistries = new ArrayList<>();
             len = ProtocolUtils.readVarInt(input);
             for (int x = 0; x < len; x++)

src/main/java/org/adde0109/ambassador/forge/pipeline/ForgeLoginWrapperCodec.java

@@ -9,40 +9,62 @@ import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.DecoderException;
 import io.netty.handler.codec.MessageToMessageCodec;
-import org.adde0109.ambassador.forge.ForgeHandshakeUtils;
+import io.netty.util.ReferenceCountUtil;
+import org.adde0109.ambassador.Ambassador;
 import org.adde0109.ambassador.forge.packet.*;
 
-import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 public class ForgeLoginWrapperCodec extends MessageToMessageCodec<DeferredByteBufHolder, IForgeLoginWrapperPacket<?>> {
 
   private final boolean FML3;
-  private final List<Integer> loginWrapperIDs = new ArrayList<>();
+  private final Map<Integer, Context> loginWrapperContexts = new HashMap<>();
 
   public ForgeLoginWrapperCodec(boolean fml3) {
     FML3 = fml3;
   }
 
+  @Override
+  public boolean acceptInboundMessage(Object msg) throws Exception {
+    return (msg instanceof LoginPluginMessagePacket
+            && ((LoginPluginMessagePacket) msg).getChannel().equals("fml:loginwrapper"))
+            || (msg instanceof LoginPluginResponsePacket
+            && loginWrapperContexts.containsKey(((LoginPluginResponsePacket) msg).getId()));
+  }
+
   @Override
   protected void decode(ChannelHandlerContext ctx, DeferredByteBufHolder in, List<Object> out) throws Exception {
+
     ByteBuf buf = in.content();
 
     Context context;
-    if (in instanceof LoginPluginMessagePacket msg && msg.getChannel().equals("fml:loginwrapper")) {
-      context = Context.createContext(msg.getId());
-    } else if (in instanceof LoginPluginResponsePacket msg && loginWrapperIDs.remove(Integer.valueOf(msg.getId()))) {
-      context = Context.createClientContext(msg.getId(), msg.isSuccess());
-    } else {
-      ctx.fireChannelRead(in.retain());
+    if (in instanceof LoginPluginResponsePacket msg) {
+      //Continue from stored context
+      context = Context.fromContext(
+              loginWrapperContexts.remove(((LoginPluginResponsePacket) msg).getId()), msg.isSuccess());
+      if (!msg.isSuccess()) {
+        //Nothing to read, just create an empty packet.
+        out.add(GenericForgeLoginWrapperPacket.read(buf, context));
         return;
+      } else {
+        String channel = ProtocolUtils.readString(buf); //Read the channel even though we know the channel by context.
+        Ambassador.getInstance();
+      }
+    } else {
+      //New context.
+      LoginPluginMessagePacket msg = (LoginPluginMessagePacket) in;
+      String channel = ProtocolUtils.readString(buf);
+
+      context = Context.createContext(msg.getId(), channel);
     }
 
+    //Decoding of data starts here - channel already read
     int originalReaderIndex = buf.readerIndex();
-    try {
-      String channel = ProtocolUtils.readString(buf);
-      if (!channel.equals("fml:handshake")) {
-        throw new DecoderException();
+
+    if (!context.getChannelName().equals("fml:handshake")) {
+      out.add(GenericForgeLoginWrapperPacket.read(buf, context));
     } else {
       int length = ProtocolUtils.readVarInt(buf);
       int packetID = ProtocolUtils.readVarInt(buf);
@@ -55,7 +77,13 @@ public class ForgeLoginWrapperCodec extends MessageToMessageCodec<DeferredByteBu
             out.add(new ACKPacket(clientContext));
             break;
           default:
-              throw new DecoderException();
+            //Undo decoding
+            buf.readerIndex(originalReaderIndex);
+            out.add(GenericForgeLoginWrapperPacket.read(buf, context));
+            if (Ambassador.getInstance().config.isDebugMode()) {
+              Ambassador.getInstance().logger.warn(
+                      "Unrecognised packet id received from client on fml:handshake: " + packetID);
+            }
         }
       } else {
         switch (packetID) {
@@ -70,45 +98,48 @@ public class ForgeLoginWrapperCodec extends MessageToMessageCodec<DeferredByteBu
             break;
           case 5:
             if (FML3) {
-                buf.readerIndex(originalReaderIndex);
               out.add(ModDataPacket.read(buf, context));
               break;
             }
           default:
-              throw new DecoderException();
-          }
-        }
-      }
-    } catch (DecoderException e) {
+            //Undo decoding
             buf.readerIndex(originalReaderIndex);
             out.add(GenericForgeLoginWrapperPacket.read(buf, context));
+            if (Ambassador.getInstance().config.isDebugMode()) {
+              Ambassador.getInstance().logger.warn(
+                      "Unrecognised packet id received from server on fml:handshake: " + packetID);
+            }
+        }
+      }
     }
   }
 
   @Override
   protected void encode(ChannelHandlerContext ctx, IForgeLoginWrapperPacket<?> msg, List<Object> out) throws Exception {
     ByteBuf wrapped;
-    if (msg instanceof GenericForgeLoginWrapperPacket<?>) {
-      wrapped = msg.encode();
-    } else {
-      String channel = "fml:handshake";
-      if (msg instanceof ForgeHandshakeUtils.SilentGearUtils.ACKPacket) {
-        channel = "silentgear:network";
-      }
+
+    boolean data = !(msg.getContext() instanceof Context.ClientContext clientContext && !clientContext.success());
+
+    boolean includeLength = !(msg instanceof GenericForgeLoginWrapperPacket);
+
+    String channel = msg.getContext().getChannelName();
+
     wrapped = Unpooled.buffer();
+
+    if (data) {
       ByteBuf encoded = msg.encode();
       ProtocolUtils.writeString(wrapped, channel);
+      if (includeLength)
         ProtocolUtils.writeVarInt(wrapped, encoded.readableBytes());
       wrapped.writeBytes(encoded);
       encoded.release();
     }
-
     if (msg.getContext() instanceof Context.ClientContext clientContext) {
       out.add(new LoginPluginResponsePacket(clientContext.getResponseID(), clientContext.success(), wrapped));
     } else {
       out.add(new LoginPluginMessagePacket(msg.getContext().getResponseID(), "fml:loginwrapper", wrapped));
-      if (!(msg instanceof ModDataPacket)) {
-        this.loginWrapperIDs.add(msg.getContext().getResponseID());
+      if (!(msg instanceof ModDataPacket)) {  //ModDataPacket doesn't require a response
+        this.loginWrapperContexts.put(msg.getContext().getResponseID(), msg.getContext());
       }
     }
   }

src/main/java/org/adde0109/ambassador/velocity/client/FML2CRPMResetCompleteDecoder.java

@@ -28,7 +28,7 @@ public class FML2CRPMResetCompleteDecoder extends ChannelInboundHandlerAdapter {
           if (id == 98) {
             try {
               ctx.fireChannelRead(GenericForgeLoginWrapperPacket.read(
-                      Unpooled.EMPTY_BUFFER, Context.createClientContext(id, success)));
+                      Unpooled.EMPTY_BUFFER, Context.createClientContext(id, success, "fml:handshake")));
             } finally {
               buf.release();
             }

src/main/resources/default-ambassador.toml

@@ -1,5 +1,5 @@
 # Do not change this
-config-version = "2.0"
+config-version = "2.1"
 
 # How much time the player has to reconnect before canceling the server switch. (In seconds)
 # Only for players with ServerRedirect mod installed. Set to -1 to disable ServerRedirect mod support.
@@ -19,3 +19,11 @@ bypass-mod-checks = false
 
 # Only for debug/troubleshooting
 debug-mode = false
+
+# Make the player reconnect when server switching as a last resort if
+# the player can't reset or switch servers without resetting.
+enable-kick-reset = false
+
+# Message to display when player gets kicked due to server switching according to enable-kick-reset.
+# This input is deserialzied as MiniMessage and support formating according to the MiniMessage format.
+reconnect-message = "<red>Please reconnect.</red>"