Waterfall/BungeeCord-Patches/0042-Ignore-empty-packets.patch

From 7aae27e71a89d2753226c4f8340560fd06ab4db1 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Fri, 12 Oct 2018 14:28:52 +0100
Subject: [PATCH] Ignore empty packets

This patch puts the proxy more inline with the client in that empty
packets will be ignored. While empty packets are a sign of bad plugins,
they are effectivly harmless vs the cost of the exception in general

diff --git a/protocol/src/main/java/net/md_5/bungee/protocol/MinecraftDecoder.java b/protocol/src/main/java/net/md_5/bungee/protocol/MinecraftDecoder.java
index 776a0603..fa021598 100644
--- a/protocol/src/main/java/net/md_5/bungee/protocol/MinecraftDecoder.java
+++ b/protocol/src/main/java/net/md_5/bungee/protocol/MinecraftDecoder.java
@@ -45,6 +45,12 @@ public class MinecraftDecoder extends MessageToMessageDecoder<ByteBuf>
         Object packetTypeInfo = null;
         try
         {
+            // Waterfall start
+            if (in.readableBytes() == 0 && !server) {
+                return;
+            }
+            // Waterfall end
+
             int packetId = DefinedPacket.readVarInt( in );
             packetTypeInfo = packetId;
 
diff --git a/protocol/src/main/java/net/md_5/bungee/protocol/Varint21FrameDecoder.java b/protocol/src/main/java/net/md_5/bungee/protocol/Varint21FrameDecoder.java
index 277e70e8..cf7dea17 100644
--- a/protocol/src/main/java/net/md_5/bungee/protocol/Varint21FrameDecoder.java
+++ b/protocol/src/main/java/net/md_5/bungee/protocol/Varint21FrameDecoder.java
@@ -40,7 +40,7 @@ public class Varint21FrameDecoder extends ByteToMessageDecoder
             if ( buf[i] >= 0 )
             {
                 int length = DefinedPacket.readVarInt( Unpooled.wrappedBuffer( buf ) );
-                if ( length == 0 )
+                if ( false && length == 0) // Waterfall - ignore
                 {
                     throw new CorruptedFrameException( "Empty Packet!" );
                 }
-- 
2.42.0