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 = "1.4.3-beta"
+version = "1.5.3-beta"
 
 repositories {
     mavenCentral()

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

@@ -19,14 +19,18 @@ 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;
 import com.velocitypowered.proxy.protocol.packet.brigadier.ArgumentIdentifier;
 import com.velocitypowered.proxy.protocol.packet.brigadier.ArgumentPropertyRegistry;
 import com.velocitypowered.proxy.protocol.packet.brigadier.ArgumentPropertySerializer;
 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;
@@ -42,11 +46,11 @@ 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 = "1.4.3-beta", 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
-  private static final String minVelocityVersion = "velocity-3.2.0-SNAPSHOT-266";
+  private static final String minVelocityVersion = "velocity-3.3.0-SNAPSHOT-330";
 
   public ProxyServer server;
   public final Logger logger;
@@ -75,11 +79,11 @@ public class Ambassador {
   boolean checkCompatibleVersion() {
     //Update this when changing minVelocityVersion
     try {
-      MinecraftConnection.class.getDeclaredMethod("setActiveSessionHandler", StateRegistry.class);
-    } catch (NoSuchMethodException e) {
-      return false;
+      Class.forName("com.velocitypowered.proxy.protocol.packet.DisconnectPacket");
+    } catch (ClassNotFoundException e) {
+        throw new RuntimeException(e);
     }
-    return true;
+      return true;
   }
 
   @Subscribe(order = PostOrder.LAST)
@@ -152,6 +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

@@ -14,92 +14,119 @@ import java.nio.file.Path;
 
 public class AmbassadorConfig {
 
-  @Expose
-  private int serverSwitchCancellationTime = 30;
+    @Expose
+    private int serverSwitchCancellationTime = 30;
 
-  @Expose
-  private boolean silenceWarnings = false;
+    @Expose
+    private boolean silenceWarnings = false;
+    @Expose
+    private boolean bypassRegistryCheck = false;
+    @Expose
+    private boolean bypassModCheck = false;
 
-  @Expose
-  private boolean bypassRegistryCheck = false;
-  @Expose
-  private boolean bypassModCheck = false;
+    @Expose
+    private boolean debugMode = false;
 
-  @Expose
-  private boolean debugMode = false;
+    @Expose
+    private boolean enableKickReset = false;
 
-  private AmbassadorConfig(boolean silenceWarnings, boolean bypassRegistryCheck, boolean bypassModCheck, boolean debugMode) {
-    this.silenceWarnings = silenceWarnings;
-    this.bypassRegistryCheck = bypassRegistryCheck;
-    this.bypassModCheck = bypassModCheck;
-    this.debugMode = debugMode;
-  };
+    @Expose
+    private String kickReconnectMessageString = "<red>Please reconnect.</red>";
 
-  public static AmbassadorConfig read(Path path) throws IOException {
-    URL defaultConfigLocation = AmbassadorConfig.class.getClassLoader()
-            .getResource("default-ambassador.toml");
-    if (defaultConfigLocation == null) {
-      throw new RuntimeException("Default configuration file does not exist.");
+    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;
     }
 
-    CommentedFileConfig config = CommentedFileConfig.builder(path)
-            .defaultData(defaultConfigLocation)
-            .autosave()
-            .preserveInsertionOrder()
-            .sync()
-            .build();
-    config.load();
+    public static AmbassadorConfig read(Path path) throws IOException {
+        URL defaultConfigLocation = AmbassadorConfig.class.getClassLoader()
+                .getResource("default-ambassador.toml");
+        if (defaultConfigLocation == null) {
+            throw new RuntimeException("Default configuration file does not exist.");
+        }
 
-    double configVersion;
-    try {
-      configVersion = Double.parseDouble(config.getOrElse("config-version", "1.0"));
-    } catch (NumberFormatException e) {
-      configVersion = 1.0;
+        CommentedFileConfig config = CommentedFileConfig.builder(path)
+                .defaultData(defaultConfigLocation)
+                .autosave()
+                .preserveInsertionOrder()
+                .sync()
+                .build();
+        config.load();
+
+        double configVersion;
+        try {
+            configVersion = Double.parseDouble(config.getOrElse("config-version", "1.0"));
+        } catch (NumberFormatException e) {
+            configVersion = 1.0;
+        }
+
+        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 <= 2.0) {
+            Files.delete(path);
+            config = CommentedFileConfig.builder(path)
+                    .defaultData(defaultConfigLocation)
+                    .autosave()
+                    .preserveInsertionOrder()
+                    .sync()
+                    .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);
+        }
+
+        boolean enableKickReset = config.getOrElse("enable-kick-reset", false);
+
+        return new AmbassadorConfig(silenceWarnings, bypassRegistryCheck, bypassModCheck,
+                debugMode, enableKickReset, kickReconnectMessageString);
     }
 
-    boolean silenceWarnings = config.getOrElse("silence-warnings", false);
-
-    //Upgrade config
-    if (configVersion <= 1.2) {
-      Files.delete(path);
-      config = CommentedFileConfig.builder(path)
-              .defaultData(defaultConfigLocation)
-              .autosave()
-              .preserveInsertionOrder()
-              .sync()
-              .build();
-      config.load();
-      config.set("silence-warnings", silenceWarnings);
+    public int getServerSwitchCancellationTime() {
+        return serverSwitchCancellationTime;
     }
 
-    int serverSwitchCancellationTime = config.getOrElse("serverRedirectTimeout", 30);
+    public boolean isSilenceWarnings() {
+        return silenceWarnings;
+    }
 
-    boolean bypassRegistryCheck = config.getOrElse("bypass-registry-checks", false);
+    public boolean isBypassRegistryCheck() {
+        return bypassRegistryCheck;
+    }
 
-    boolean bypassModCheck = config.getOrElse("bypass-mod-checks", false);
+    public boolean isBypassModCheck() {
+        return bypassModCheck;
+    }
 
-    boolean debugMode = config.getOrElse("debug-mode", false);
+    public boolean isDebugMode() {
+        return debugMode;
+    }
 
-    return new AmbassadorConfig(bypassRegistryCheck, bypassModCheck, silenceWarnings, debugMode);
-  }
+    public boolean isEnableKickReset() {
+        return enableKickReset;
+    }
 
-  public int getServerSwitchCancellationTime() {
-    return serverSwitchCancellationTime;
-  }
-
-  public boolean isSilenceWarnings() {
-    return silenceWarnings;
-  }
-
-  public boolean isBypassRegistryCheck() {
-    return bypassRegistryCheck;
-  }
-
-  public boolean isBypassModCheck() {
-    return bypassModCheck;
-  }
-
-  public boolean isDebugMode() {
-    return debugMode;
-  }
+    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 {
+
+    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);
     }
 
-    public static class ACKPacket implements IForgeLoginWrapperPacket<Context.ClientContext> {
-      private final Context.ClientContext context;
-
-      public ACKPacket(Context.ClientContext context) {
-        this.context = context;
+    static boolean isThirdPartyPacket(GenericForgeLoginWrapperPacket<Context> packet) {
+      try {
+        Enum.valueOf(ThirdPartyChannel.class,
+                packet.getContext().getChannelName().replace(':', '_').toUpperCase());
+        return true;
+      } catch (IllegalArgumentException e) {
+        return false;
       }
-      @Override
+    }
+
+    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

@@ -6,10 +6,8 @@ import com.velocitypowered.proxy.connection.backend.VelocityServerConnection;
 import com.velocitypowered.proxy.connection.client.ConnectedPlayer;
 import com.velocitypowered.proxy.network.Connections;
 import com.velocitypowered.proxy.protocol.ProtocolUtils;
-import com.velocitypowered.proxy.protocol.StateRegistry;
 import com.velocitypowered.proxy.protocol.packet.AvailableCommandsPacket;
 import com.velocitypowered.proxy.protocol.packet.PluginMessagePacket;
-import net.kyori.adventure.identity.Identity;
 import net.kyori.adventure.text.Component;
 import org.adde0109.ambassador.Ambassador;
 import org.adde0109.ambassador.forge.packet.*;
@@ -64,37 +62,22 @@ 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);
 
-    if (player.getPhase() == VelocityForgeClientConnectionPhase.NOT_STARTED ||
-            player.getPhase() == VelocityForgeClientConnectionPhase.IN_PROGRESS) {
-      //Initial Forge
-      player.getConnection().write(message);
-      return;
-    }
-
     //Forge -> Forge
 
-    //Reset client if not ready to receive new handshake
     VelocityForgeClientConnectionPhase clientPhase = (VelocityForgeClientConnectionPhase) player.getPhase();
-    if (clientPhase.getResetType() == VelocityForgeClientConnectionPhase.clientResetType.CRP ||
-            clientPhase.getResetType() == VelocityForgeClientConnectionPhase.clientResetType.SR) {
-      clientPhase.resetConnectionPhase(player);
-      player.getConnection().write(message);
+
+
+    if (!player.isActive()) {
       return;
     }
 
-
-    //STILL WIP
-    if (!Ambassador.getInstance().config.isDebugMode()) {
-      server.disconnect();
-      return;
-    }
-
-    if (clientPhase.getResetType() == VelocityForgeClientConnectionPhase.clientResetType.NONE) {
+    if (!clientPhase.consideredComplete()) {
+      //Initial Forge
       if (message instanceof ModListPacket modListPacket) {
         clientPhase.forgeHandshake = new ForgeHandshake();
       }
@@ -103,6 +86,29 @@ public enum VelocityForgeBackendConnectionPhase implements BackendConnectionPhas
       }
       player.getConnection().write(message);
     } else {
+      //Reset client if not ready to receive new handshake
+      if (clientPhase.getResetType() == VelocityForgeClientConnectionPhase.ClientResetType.CRP ||
+              clientPhase.getResetType() == VelocityForgeClientConnectionPhase.ClientResetType.SR) {
+        clientPhase.resetConnectionPhase(player);
+        player.getConnection().write(message);
+        return;
+      }
+
+      if (clientPhase.forgeHandshake.getModListReplyPacket() == null) {
+        //We have nothing to respond with during this handshake. Unable to proceed.
+        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;
+      }
+
       if (message instanceof ModListPacket modListPacket) {
         remainingRegistries = new CountDownLatch(modListPacket.getRegistries().size());
 
@@ -120,14 +126,17 @@ public enum VelocityForgeBackendConnectionPhase implements BackendConnectionPhas
         }).thenAcceptAsync((v) -> {
 
           if(Ambassador.getInstance().config.isDebugMode()) {
-            player.sendMessage(Component.text("Handshake took: " + (System.currentTimeMillis()-time)/1000 + " seconds"));
+            player.sendMessage(Component.text("Handshake took: " + (System.currentTimeMillis()-time) + " ms"));
             player.sendMessage(Component.text("Avg packet time" +
-                    ((System.currentTimeMillis()-time)/1000)/modListPacket.getRegistries().size() + " seconds"));
+                    (System.currentTimeMillis()-time)/modListPacket.getRegistries().size() + " ms"));
           }
 
           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 " +
@@ -141,10 +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 {
 
@@ -37,17 +39,12 @@ public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase
     public void complete(ConnectedPlayer player) {
       //When no handshake has taken place.
       //Test if the client supports CRP.
-      clientResetType.CRP.doReset(player);
-    }
-
-    @Override
-    public boolean consideredComplete() {
-      return true;
+      ClientResetType.CRP.doReset(player);
     }
     },
   IN_PROGRESS {
   },
-  WAITING_RESET {
+  WAITING_RESET() {
     @Override
     void onTransitionToNewPhase(ConnectedPlayer player) {
       //We unregister so no plugin sees this client while the client is being reset.
@@ -70,7 +67,7 @@ public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase
 
         if (!(server.getConnection().getType() instanceof ForgeFMLConnectionType)) {
           // -> vanilla
-          complete(player, ((Context.ClientContext) msg.getContext()).success() ? clientResetType.CRP : clientResetType.UNKNOWN);
+          complete(player, ((Context.ClientContext) msg.getContext()).success() ? ClientResetType.CRP : null);
         }
 
         if (player.getConnectionInFlight() != null) {
@@ -84,8 +81,15 @@ public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase
     }
   },
   COMPLETE {
+
+    private ClientResetType resetType = ClientResetType.UNKNOWN;
     @Override
     void onTransitionToNewPhase(ConnectedPlayer player) {
+      //Send Login Success to client
+      MinecraftConnection connection = player.getConnection();
+      ((OutboundSuccessHolder) connection.getChannel().pipeline().get(ForgeConstants.SERVER_SUCCESS_LISTENER))
+              .sendPacket();
+      connection.setState(StateRegistry.PLAY);
       //Plugins may now send packets to client
       player.getConnection().getChannel().pipeline().remove(ForgeConstants.PLUGIN_PACKET_QUEUE);
       ((VelocityServer) Ambassador.getInstance().server).registerConnection(player);
@@ -102,21 +106,35 @@ public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase
     }
 
     @Override
-    public void complete(ConnectedPlayer player, clientResetType resetType) {
+    public void complete(ConnectedPlayer player) {
       if (Ambassador.getInstance().config.isDebugMode()) {
-        player.sendMessage(Component.text("Forge -> Vanilla - Not resetting"));
+        player.sendMessage(Component.text("Not resetting"));
       }
     }
 
+    @Override
+    void setResetType(ConnectedPlayer player, ClientResetType resetType) {
+      this.resetType = resetType;
+      if (Ambassador.getInstance().config.isDebugMode()) {
+        player.sendMessage(Component.text("Reset type: " + this.resetType.toString()));
+      }
+    }
+
+    @Override
+    public ClientResetType getResetType() {
+      return resetType;
+    }
   };
 
   //TODO: Make a new class that's linked to each player with these fields instead of having them in this phase class
   public ForgeHandshake forgeHandshake = new ForgeHandshake();
 
-  private clientResetType resetType = clientResetType.UNKNOWN;
-
   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());
@@ -137,47 +155,24 @@ public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase
 
     return true;
   }
-
   public void complete(ConnectedPlayer player) {
-    complete(player, getResetType(player));
+    complete(player, null);
   }
 
-  public void complete(ConnectedPlayer player, clientResetType resetType) {
-    MinecraftConnection connection = player.getConnection();
-    //Send Login Success to client
-    ((OutboundSuccessHolder) connection.getChannel().pipeline().get(ForgeConstants.SERVER_SUCCESS_LISTENER))
-            .sendPacket();
-    connection.setState(StateRegistry.PLAY);
-
+  public void complete(ConnectedPlayer player, ClientResetType resetType) {
     //Change phase to COMPLETE
     player.setPhase(COMPLETE);
-    COMPLETE.resetType = resetType;
     COMPLETE.onTransitionToNewPhase(player);
     COMPLETE.forgeHandshake = forgeHandshake;
+    if (resetType != null) {
+      COMPLETE.setResetType(player, resetType);
+    }
 
     if (Ambassador.getInstance().config.isDebugMode()) {
       player.sendMessage(Component.text("Forge handshake complete"));
-      player.sendMessage(Component.text("Reset type: " + resetType.toString()));
     }
   }
 
-  private clientResetType getResetType(ConnectedPlayer player) {
-    if (Ambassador.getInstance().config.isDebugMode()) {
-      player.sendMessage(Component.text("Scanning modlist for client reset mods"));
-    }
-    if (player.getModInfo().isPresent()) {
-      if (player.getModInfo().get().getMods().stream().anyMatch((mod -> mod.getId().equals("clientresetpacket")))) {
-        return clientResetType.CRP;
-      } else if (Ambassador.getInstance().config.getServerSwitchCancellationTime() >= 0 &&
-              player.getModInfo().get().getMods().stream().anyMatch((mod -> mod.getId().equals("serverredirect")
-              || mod.getId().equals("srvredirect:red")))
-              && player.getVirtualHost().isPresent()) {
-        return clientResetType.SR;
-      }
-    }
-    return clientResetType.NONE;
-  }
-
   void onTransitionToNewPhase(ConnectedPlayer player) {
 
   }
@@ -191,10 +186,35 @@ public enum VelocityForgeClientConnectionPhase implements ClientConnectionPhase
     return false;
   }
 
-  public clientResetType getResetType() {
-    return resetType;
+  public ClientResetType getResetType() {
+    return COMPLETE.getResetType();
   }
-  enum clientResetType {
+
+  private ClientResetType getResetType(ConnectedPlayer player) {
+    if (Ambassador.getInstance().config.isDebugMode()) {
+      player.sendMessage(Component.text("Scanning modlist for client reset mods"));
+    }
+    if (player.getModInfo().isPresent()) {
+      if (player.getModInfo().get().getMods().stream().anyMatch((mod -> mod.getId().equals("clientresetpacket")))) {
+        return ClientResetType.CRP;
+      } else if (Ambassador.getInstance().config.getServerSwitchCancellationTime() >= 0 &&
+              player.getModInfo().get().getMods().stream().anyMatch((mod -> mod.getId().equals("serverredirect")
+                      || mod.getId().equals("srvredirect:red")))
+              && player.getVirtualHost().isPresent()) {
+        return ClientResetType.SR;
+      }
+    }
+    return ClientResetType.NONE;
+  }
+
+  void setResetType(ConnectedPlayer player, ClientResetType resetType) {
+    COMPLETE.setResetType(player, resetType);
+  }
+  public void updateResetType(ConnectedPlayer player) {
+    COMPLETE.setResetType(player, getResetType(player));
+  }
+
+  public enum ClientResetType {
     UNKNOWN,
     NONE,
     CRP {
@@ -236,6 +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

@@ -9,106 +9,137 @@ 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());
+    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 {
-      ctx.fireChannelRead(in.retain());
-      return;
+      //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);
+      if (context instanceof Context.ClientContext clientContext) {
+        switch (packetID) {
+          case 2:
+            out.add(ModListReplyPacket.read(buf, clientContext));
+            break;
+          case 99:
+            out.add(new ACKPacket(clientContext));
+            break;
+          default:
+            //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 {
-        int length = ProtocolUtils.readVarInt(buf);
-        int packetID = ProtocolUtils.readVarInt(buf);
-        if (context instanceof Context.ClientContext clientContext) {
-          switch (packetID) {
-            case 2:
-              out.add(ModListReplyPacket.read(buf, clientContext));
+        switch (packetID) {
+          case 1:
+            out.add(ModListPacket.read(buf, context, FML3));
+            break;
+          case 3:
+            out.add(RegistryPacket.read(buf, context, FML3));
+            break;
+          case 4:
+            out.add(ConfigDataPacket.read(buf, context, FML3));
+            break;
+          case 5:
+            if (FML3) {
+              out.add(ModDataPacket.read(buf, context));
               break;
-            case 99:
-              out.add(new ACKPacket(clientContext));
-              break;
-            default:
-              throw new DecoderException();
-          }
-        } else {
-          switch (packetID) {
-            case 1:
-              out.add(ModListPacket.read(buf, context, FML3));
-              break;
-            case 3:
-              out.add(RegistryPacket.read(buf, context, FML3));
-              break;
-            case 4:
-              out.add(ConfigDataPacket.read(buf, context, FML3));
-              break;
-            case 5:
-              if (FML3) {
-                buf.readerIndex(originalReaderIndex);
-                out.add(ModDataPacket.read(buf, context));
-                break;
-              }
-            default:
-              throw new DecoderException();
-          }
+            }
+          default:
+            //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);
+            }
         }
       }
-    } catch (DecoderException e) {
-      buf.readerIndex(originalReaderIndex);
-      out.add(GenericForgeLoginWrapperPacket.read(buf, context));
     }
   }
 
   @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";
-      }
-      wrapped = Unpooled.buffer();
+
+    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);
-      ProtocolUtils.writeVarInt(wrapped, encoded.readableBytes());
+      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/VelocityEventHandler.java

@@ -71,6 +71,12 @@ public class VelocityEventHandler {
     player.setModInfo(new ModInfo("Channels", event.getChannels().stream().map((id) -> {
       return new ModInfo.Mod(id.getId(), "");
     }).toList()));
+
+    VelocityForgeClientConnectionPhase clientPhase = (VelocityForgeClientConnectionPhase) player.getPhase();
+    //If reset typ is still unknown, set it!
+    if (clientPhase.getResetType() == VelocityForgeClientConnectionPhase.ClientResetType.UNKNOWN) {
+      clientPhase.updateResetType(player);
+    }
   }
 
 }

src/main/java/org/adde0109/ambassador/velocity/backend/ForgeLoginSessionHandler.java

@@ -37,7 +37,8 @@ public class ForgeLoginSessionHandler implements MinecraftSessionHandler {
     if (serverConnection.getConnection() != null) {
       ConnectedPlayer player = serverConnection.getPlayer();
 
-      ((VelocityForgeClientConnectionPhase) player.getPhase()).complete(player);
+      VelocityForgeClientConnectionPhase clientPhase = (VelocityForgeClientConnectionPhase) player.getPhase();
+      clientPhase.complete(player);
     }
 
     return true;

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.
@@ -17,5 +17,13 @@ bypass-registry-checks = false
 # Warning: This is a safety measure for when bypassRegistryCheck is true. Setting this to also true can cause crashes.
 bypass-mod-checks = false
 
-#Only for debug/troubleshooting
-debug-mode = 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>"