Minecraft 1.21.9 (#1651)

* 1.21.9-pr1
- not tested yet

* 1.21.9-pre2

* feat: forward code of conduct packets in CONFIG state

* 1.21.9

---------

Co-authored-by: Emilxyz <12966472+Emilxyz@users.noreply.github.com>

api/src/main/java/com/velocitypowered/api/network/ProtocolVersion.java

@@ -92,7 +92,8 @@ public enum ProtocolVersion implements Ordered<ProtocolVersion> {
   MINECRAFT_1_21_4(769, "1.21.4"),
   MINECRAFT_1_21_5(770, "1.21.5"),
   MINECRAFT_1_21_6(771, "1.21.6"),
-  MINECRAFT_1_21_7(772, "1.21.7", "1.21.8");
+  MINECRAFT_1_21_7(772, "1.21.7", "1.21.8"),
+  MINECRAFT_1_21_9(773, "1.21.9");
 
   private static final int SNAPSHOT_BIT = 30;
 

proxy/src/main/java/com/velocitypowered/proxy/connection/MinecraftSessionHandler.java

@@ -70,6 +70,8 @@ import com.velocitypowered.proxy.protocol.packet.chat.session.SessionPlayerComma
 import com.velocitypowered.proxy.protocol.packet.config.ActiveFeaturesPacket;
 import com.velocitypowered.proxy.protocol.packet.config.ClientboundCustomReportDetailsPacket;
 import com.velocitypowered.proxy.protocol.packet.config.ClientboundServerLinksPacket;
+import com.velocitypowered.proxy.protocol.packet.config.CodeOfConductAcceptPacket;
+import com.velocitypowered.proxy.protocol.packet.config.CodeOfConductPacket;
 import com.velocitypowered.proxy.protocol.packet.config.FinishedUpdatePacket;
 import com.velocitypowered.proxy.protocol.packet.config.KnownPacksPacket;
 import com.velocitypowered.proxy.protocol.packet.config.RegistrySyncPacket;
@@ -380,4 +382,12 @@ public interface MinecraftSessionHandler {
     return false;
   }
 
+  default boolean handle(CodeOfConductPacket packet) {
+    return false;
+  }
+
+  default boolean handle(CodeOfConductAcceptPacket packet) {
+    return false;
+  }
+
 }

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/ConfigSessionHandler.java

@@ -52,6 +52,7 @@ import com.velocitypowered.proxy.protocol.packet.ResourcePackResponsePacket;
 import com.velocitypowered.proxy.protocol.packet.TransferPacket;
 import com.velocitypowered.proxy.protocol.packet.config.ClientboundCustomReportDetailsPacket;
 import com.velocitypowered.proxy.protocol.packet.config.ClientboundServerLinksPacket;
+import com.velocitypowered.proxy.protocol.packet.config.CodeOfConductPacket;
 import com.velocitypowered.proxy.protocol.packet.config.FinishedUpdatePacket;
 import com.velocitypowered.proxy.protocol.packet.config.RegistrySyncPacket;
 import com.velocitypowered.proxy.protocol.packet.config.StartUpdatePacket;
@@ -358,6 +359,12 @@ public class ConfigSessionHandler implements MinecraftSessionHandler {
     return true;
   }
 
+  @Override
+  public boolean handle(CodeOfConductPacket packet) {
+    this.serverConn.getPlayer().getConnection().write(packet.retain());
+    return true;
+  }
+
   @Override
   public void disconnected() {
     resultFuture.completeExceptionally(

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

@@ -41,6 +41,7 @@ import com.velocitypowered.proxy.protocol.packet.PluginMessagePacket;
 import com.velocitypowered.proxy.protocol.packet.ResourcePackResponsePacket;
 import com.velocitypowered.proxy.protocol.packet.ServerboundCookieResponsePacket;
 import com.velocitypowered.proxy.protocol.packet.ServerboundCustomClickActionPacket;
+import com.velocitypowered.proxy.protocol.packet.config.CodeOfConductAcceptPacket;
 import com.velocitypowered.proxy.protocol.packet.config.FinishedUpdatePacket;
 import com.velocitypowered.proxy.protocol.packet.config.KnownPacksPacket;
 import com.velocitypowered.proxy.protocol.util.PluginMessageUtil;
@@ -216,6 +217,16 @@ public class ClientConfigSessionHandler implements MinecraftSessionHandler {
     return false;
   }
 
+  @Override
+  public boolean handle(CodeOfConductAcceptPacket packet) {
+    if (this.player.getConnectionInFlight() != null) {
+      this.player.getConnectionInFlight().ensureConnected().write(packet);
+      return true;
+    }
+
+    return false;
+  }
+
   @Override
   public void handleGeneric(MinecraftPacket packet) {
     VelocityServerConnection serverConnection = player.getConnectedServer();

proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java

@@ -41,6 +41,7 @@ import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_4;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_5;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_6;
+import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_9;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_7_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_8;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_9;
@@ -104,6 +105,8 @@ import com.velocitypowered.proxy.protocol.packet.chat.session.UnsignedPlayerComm
 import com.velocitypowered.proxy.protocol.packet.config.ActiveFeaturesPacket;
 import com.velocitypowered.proxy.protocol.packet.config.ClientboundCustomReportDetailsPacket;
 import com.velocitypowered.proxy.protocol.packet.config.ClientboundServerLinksPacket;
+import com.velocitypowered.proxy.protocol.packet.config.CodeOfConductAcceptPacket;
+import com.velocitypowered.proxy.protocol.packet.config.CodeOfConductPacket;
 import com.velocitypowered.proxy.protocol.packet.config.FinishedUpdatePacket;
 import com.velocitypowered.proxy.protocol.packet.config.KnownPacksPacket;
 import com.velocitypowered.proxy.protocol.packet.config.RegistrySyncPacket;
@@ -188,6 +191,10 @@ public enum StateRegistry {
           map(0x07, MINECRAFT_1_20_5, false));
       serverbound.register(ServerboundCustomClickActionPacket.class, ServerboundCustomClickActionPacket::new,
           map(0x08, MINECRAFT_1_21_6, false));
+      serverbound.register(
+          CodeOfConductAcceptPacket.class,
+          () -> CodeOfConductAcceptPacket.INSTANCE,
+          map(0x09, MINECRAFT_1_21_9, false));
 
       clientbound.register(
           ClientboundCookieRequestPacket.class, ClientboundCookieRequestPacket::new,
@@ -246,6 +253,8 @@ public enum StateRegistry {
           map(0x11, MINECRAFT_1_21_6, false));
       clientbound.register(DialogShowPacket.class, () -> new DialogShowPacket(this),
           map(0x12, MINECRAFT_1_21_6, false));
+      clientbound.register(CodeOfConductPacket.class, CodeOfConductPacket::new,
+          map(0x13, MINECRAFT_1_21_9, false));
     }
   },
   PLAY {
@@ -474,7 +483,8 @@ public enum StateRegistry {
           map(0x1A, MINECRAFT_1_19_4, false),
           map(0x1B, MINECRAFT_1_20_2, false),
           map(0x1D, MINECRAFT_1_20_5, false),
-          map(0x1C, MINECRAFT_1_21_5, false));
+          map(0x1C, MINECRAFT_1_21_5, false),
+          map(0x20, MINECRAFT_1_21_9, false));
       clientbound.register(
           KeepAlivePacket.class,
           KeepAlivePacket::new,
@@ -493,7 +503,8 @@ public enum StateRegistry {
           map(0x24, MINECRAFT_1_20_2, false),
           map(0x26, MINECRAFT_1_20_5, false),
           map(0x27, MINECRAFT_1_21_2, false),
-          map(0x26, MINECRAFT_1_21_5, false));
+          map(0x26, MINECRAFT_1_21_5, false),
+          map(0x2B, MINECRAFT_1_21_9, false));
       clientbound.register(
           JoinGamePacket.class,
           JoinGamePacket::new,
@@ -512,7 +523,8 @@ public enum StateRegistry {
           map(0x29, MINECRAFT_1_20_2, false),
           map(0x2B, MINECRAFT_1_20_5, false),
           map(0x2C, MINECRAFT_1_21_2, false),
-          map(0x2B, MINECRAFT_1_21_5, false));
+          map(0x2B, MINECRAFT_1_21_5, false),
+          map(0x30, MINECRAFT_1_21_9, false));
       clientbound.register(
           RespawnPacket.class,
           RespawnPacket::new,
@@ -534,14 +546,16 @@ public enum StateRegistry {
           map(0x45, MINECRAFT_1_20_3, true),
           map(0x47, MINECRAFT_1_20_5, true),
           map(0x4C, MINECRAFT_1_21_2, true),
-          map(0x4B, MINECRAFT_1_21_5, true));
+          map(0x4B, MINECRAFT_1_21_5, true),
+          map(0x50, MINECRAFT_1_21_9, true));
       clientbound.register(
           RemoveResourcePackPacket.class,
           RemoveResourcePackPacket::new,
           map(0x43, MINECRAFT_1_20_3, false),
           map(0x45, MINECRAFT_1_20_5, false),
           map(0x4A, MINECRAFT_1_21_2, false),
-          map(0x49, MINECRAFT_1_21_5, false));
+          map(0x49, MINECRAFT_1_21_5, false),
+          map(0x4E, MINECRAFT_1_21_9, false));
       clientbound.register(
           ResourcePackRequestPacket.class,
           ResourcePackRequestPacket::new,
@@ -563,7 +577,8 @@ public enum StateRegistry {
           map(0x44, MINECRAFT_1_20_3, false),
           map(0x46, MINECRAFT_1_20_5, false),
           map(0x4B, MINECRAFT_1_21_2, false),
-          map(0x4A, MINECRAFT_1_21_5, false));
+          map(0x4A, MINECRAFT_1_21_5, false),
+          map(0x4F, MINECRAFT_1_21_9, false));
       clientbound.register(
           HeaderAndFooterPacket.class,
           HeaderAndFooterPacket::new,
@@ -586,7 +601,8 @@ public enum StateRegistry {
           map(0x6A, MINECRAFT_1_20_3, true),
           map(0x6D, MINECRAFT_1_20_5, true),
           map(0x74, MINECRAFT_1_21_2, true),
-          map(0x73, MINECRAFT_1_21_5, true));
+          map(0x73, MINECRAFT_1_21_5, true),
+          map(0x78, MINECRAFT_1_21_9, true));
       clientbound.register(
           LegacyTitlePacket.class,
           LegacyTitlePacket::new,
@@ -608,7 +624,8 @@ public enum StateRegistry {
           map(0x61, MINECRAFT_1_20_3, true),
           map(0x63, MINECRAFT_1_20_5, true),
           map(0x6A, MINECRAFT_1_21_2, true),
-          map(0x69, MINECRAFT_1_21_5, true));
+          map(0x69, MINECRAFT_1_21_5, true),
+          map(0x6E, MINECRAFT_1_21_9, true));
       clientbound.register(
           TitleTextPacket.class,
           TitleTextPacket::new,
@@ -621,7 +638,8 @@ public enum StateRegistry {
           map(0x63, MINECRAFT_1_20_3, true),
           map(0x65, MINECRAFT_1_20_5, true),
           map(0x6C, MINECRAFT_1_21_2, true),
-          map(0x6B, MINECRAFT_1_21_5, true));
+          map(0x6B, MINECRAFT_1_21_5, true),
+          map(0x70, MINECRAFT_1_21_9, true));
       clientbound.register(
           TitleActionbarPacket.class,
           TitleActionbarPacket::new,
@@ -634,7 +652,8 @@ public enum StateRegistry {
           map(0x4A, MINECRAFT_1_20_3, true),
           map(0x4C, MINECRAFT_1_20_5, true),
           map(0x51, MINECRAFT_1_21_2, true),
-          map(0x50, MINECRAFT_1_21_5, true));
+          map(0x50, MINECRAFT_1_21_5, true),
+          map(0x55, MINECRAFT_1_21_9, true));
       clientbound.register(
           TitleTimesPacket.class,
           TitleTimesPacket::new,
@@ -647,7 +666,8 @@ public enum StateRegistry {
           map(0x64, MINECRAFT_1_20_3, true),
           map(0x66, MINECRAFT_1_20_5, true),
           map(0x6D, MINECRAFT_1_21_2, true),
-          map(0x6C, MINECRAFT_1_21_5, true));
+          map(0x6C, MINECRAFT_1_21_5, true),
+          map(0x71, MINECRAFT_1_21_9, true));
       clientbound.register(
           TitleClearPacket.class,
           TitleClearPacket::new,
@@ -677,7 +697,8 @@ public enum StateRegistry {
           map(0x3B, MINECRAFT_1_20_2, false),
           map(0x3D, MINECRAFT_1_20_5, false),
           map(0x3F, MINECRAFT_1_21_2, false),
-          map(0x3E, MINECRAFT_1_21_5, false));
+          map(0x3E, MINECRAFT_1_21_5, false),
+          map(0x43, MINECRAFT_1_21_9, false));
       clientbound.register(
           UpsertPlayerInfoPacket.class,
           UpsertPlayerInfoPacket::new,
@@ -686,12 +707,14 @@ public enum StateRegistry {
           map(0x3C, MINECRAFT_1_20_2, false),
           map(0x3E, MINECRAFT_1_20_5, false),
           map(0x40, MINECRAFT_1_21_2, false),
-          map(0x3F, MINECRAFT_1_21_5, false));
+          map(0x3F, MINECRAFT_1_21_5, false),
+          map(0x44, MINECRAFT_1_21_9, false));
       clientbound.register(
           ClientboundStoreCookiePacket.class, ClientboundStoreCookiePacket::new,
           map(0x6B, MINECRAFT_1_20_5, false),
           map(0x72, MINECRAFT_1_21_2, false),
-          map(0x71, MINECRAFT_1_21_5, false));
+          map(0x71, MINECRAFT_1_21_5, false),
+          map(0x76, MINECRAFT_1_21_9, false));
       clientbound.register(
           SystemChatPacket.class,
           SystemChatPacket::new,
@@ -703,7 +726,8 @@ public enum StateRegistry {
           map(0x69, MINECRAFT_1_20_3, true),
           map(0x6C, MINECRAFT_1_20_5, true),
           map(0x73, MINECRAFT_1_21_2, true),
-          map(0x72, MINECRAFT_1_21_5, true));
+          map(0x72, MINECRAFT_1_21_5, true),
+          map(0x77, MINECRAFT_1_21_9, true));
       clientbound.register(
           PlayerChatCompletionPacket.class,
           PlayerChatCompletionPacket::new,
@@ -724,7 +748,8 @@ public enum StateRegistry {
           map(0x49, MINECRAFT_1_20_3, false),
           map(0x4B, MINECRAFT_1_20_5, false),
           map(0x50, MINECRAFT_1_21_2, false),
-          map(0x4F, MINECRAFT_1_21_5, false));
+          map(0x4F, MINECRAFT_1_21_5, false),
+          map(0x54, MINECRAFT_1_21_9, false));
       clientbound.register(
           StartUpdatePacket.class,
           () -> StartUpdatePacket.INSTANCE,
@@ -732,7 +757,8 @@ public enum StateRegistry {
           map(0x67, MINECRAFT_1_20_3, false),
           map(0x69, MINECRAFT_1_20_5, false),
           map(0x70, MINECRAFT_1_21_2, false),
-          map(0x6F, MINECRAFT_1_21_5, false));
+          map(0x6F, MINECRAFT_1_21_5, false),
+          map(0x74, MINECRAFT_1_21_9, false));
       clientbound.register(
           BundleDelimiterPacket.class,
           () -> BundleDelimiterPacket.INSTANCE,
@@ -741,17 +767,20 @@ public enum StateRegistry {
           TransferPacket.class,
           TransferPacket::new,
           map(0x73, MINECRAFT_1_20_5, false),
-          map(0x7A, MINECRAFT_1_21_2, false));
+          map(0x7A, MINECRAFT_1_21_2, false),
+          map(0x7F, MINECRAFT_1_21_9, false));
       clientbound.register(
           ClientboundCustomReportDetailsPacket.class,
           ClientboundCustomReportDetailsPacket::new,
           map(0x7A, MINECRAFT_1_21, false),
-          map(0x81, MINECRAFT_1_21_2, false));
+          map(0x81, MINECRAFT_1_21_2, false),
+          map(0x86, MINECRAFT_1_21_9, false));
       clientbound.register(
           ClientboundServerLinksPacket.class,
           ClientboundServerLinksPacket::new,
           map(0x7B, MINECRAFT_1_21, false),
-          map(0x82, MINECRAFT_1_21_2, false));
+          map(0x82, MINECRAFT_1_21_2, false),
+          map(0x87, MINECRAFT_1_21_9, false));
     }
   },
   LOGIN {

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/config/CodeOfConductAcceptPacket.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2018-2025 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.velocitypowered.proxy.protocol.packet.config;
+
+import com.velocitypowered.api.network.ProtocolVersion;
+import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
+import com.velocitypowered.proxy.protocol.MinecraftPacket;
+import com.velocitypowered.proxy.protocol.ProtocolUtils.Direction;
+import io.netty.buffer.ByteBuf;
+
+public class CodeOfConductAcceptPacket implements MinecraftPacket {
+
+  public static final CodeOfConductAcceptPacket INSTANCE = new CodeOfConductAcceptPacket();
+
+  private CodeOfConductAcceptPacket() {
+  }
+
+  @Override
+  public void decode(ByteBuf buf, Direction direction, ProtocolVersion protocolVersion) {
+  }
+
+  @Override
+  public void encode(ByteBuf buf, Direction direction, ProtocolVersion protocolVersion) {
+  }
+
+  @Override
+  public boolean handle(MinecraftSessionHandler handler) {
+    return handler.handle(this);
+  }
+}

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/config/CodeOfConductPacket.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2018-2025 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.velocitypowered.proxy.protocol.packet.config;
+
+import com.velocitypowered.api.network.ProtocolVersion;
+import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
+import com.velocitypowered.proxy.protocol.MinecraftPacket;
+import com.velocitypowered.proxy.protocol.ProtocolUtils.Direction;
+import com.velocitypowered.proxy.protocol.util.DeferredByteBufHolder;
+import io.netty.buffer.ByteBuf;
+
+public class CodeOfConductPacket extends DeferredByteBufHolder implements MinecraftPacket {
+
+  public CodeOfConductPacket() {
+    super(null);
+  }
+
+  @Override
+  public void decode(ByteBuf buf, Direction direction, ProtocolVersion protocolVersion) {
+    this.replace(buf.readRetainedSlice(buf.readableBytes()));
+  }
+
+  @Override
+  public void encode(ByteBuf buf, Direction direction, ProtocolVersion protocolVersion) {
+    buf.writeBytes(this.content());
+  }
+
+  @Override
+  public boolean handle(MinecraftSessionHandler handler) {
+    return handler.handle(this);
+  }
+}