From 0d7513c4a4187bb0bd8dd7c202036cbfdd9ab42b Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 27 Nov 2018 21:42:42 -0500
Subject: [PATCH] Handle Large Packets disconnecting client

If a players inventory is too big to send in a single packet,
split the inventory set into multiple packets instead.
---
 ...e-Large-Packets-disconnecting-client.patch | 119 ++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 Spigot-Server-Patches/0415-Handle-Large-Packets-disconnecting-client.patch

diff --git a/Spigot-Server-Patches/0415-Handle-Large-Packets-disconnecting-client.patch b/Spigot-Server-Patches/0415-Handle-Large-Packets-disconnecting-client.patch
new file mode 100644
index 000000000..69164147a
--- /dev/null
+++ b/Spigot-Server-Patches/0415-Handle-Large-Packets-disconnecting-client.patch
@@ -0,0 +1,119 @@
+From 030ce5b54e606115c3cce607fea5ab7bdd669242 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Tue, 27 Nov 2018 21:18:06 -0500
+Subject: [PATCH] Handle Large Packets disconnecting client
+
+If a players inventory is too big to send in a single packet,
+split the inventory set into multiple packets instead.
+
+diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
+index 97a9dffe6..2f887932b 100644
+--- a/src/main/java/net/minecraft/server/NetworkManager.java
++++ b/src/main/java/net/minecraft/server/NetworkManager.java
+@@ -100,6 +100,15 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
+     }
+ 
+     public void exceptionCaught(ChannelHandlerContext channelhandlercontext, Throwable throwable) {
++        // Paper start
++        if (throwable instanceof io.netty.handler.codec.EncoderException && throwable.getCause() instanceof PacketEncoder.PacketTooLargeException) {
++            if (((PacketEncoder.PacketTooLargeException) throwable.getCause()).getPacket().packetTooLarge(this)) {
++                return;
++            } else {
++                throwable = throwable.getCause();
++            }
++        }
++        // Paper end
+         if (throwable instanceof SkipEncodeException) {
+             NetworkManager.g.debug("Skipping packet due to errors", throwable.getCause());
+         } else {
+diff --git a/src/main/java/net/minecraft/server/Packet.java b/src/main/java/net/minecraft/server/Packet.java
+index 2e42c268b..0a9bfb07a 100644
+--- a/src/main/java/net/minecraft/server/Packet.java
++++ b/src/main/java/net/minecraft/server/Packet.java
+@@ -9,6 +9,12 @@ public interface Packet<T extends PacketListener> {
+ 
+     void a(T var1);
+ 
++    // Paper start
++    default boolean packetTooLarge(NetworkManager manager) {
++        return false;
++    }
++    // Paper end
++
+     default boolean a() {
+         return false;
+     }
+diff --git a/src/main/java/net/minecraft/server/PacketEncoder.java b/src/main/java/net/minecraft/server/PacketEncoder.java
+index c20911c96..c22c3eebc 100644
+--- a/src/main/java/net/minecraft/server/PacketEncoder.java
++++ b/src/main/java/net/minecraft/server/PacketEncoder.java
+@@ -45,10 +45,32 @@ public class PacketEncoder extends MessageToByteEncoder<Packet<?>> {
+                         throw throwable;
+                     }
+                 }
++
++                // Paper start
++                int packetLength = bytebuf.readableBytes();
++                if (packetLength > MAX_PACKET_SIZE) {
++                    throw new PacketTooLargeException(packet, packetLength);
++                }
++                // Paper end
+             }
+         }
+     }
+ 
++    // Paper start
++    private static int MAX_PACKET_SIZE = 2097152;
++    public static class PacketTooLargeException extends RuntimeException {
++        private final Packet<?> packet;
++        PacketTooLargeException(Packet<?> packet, int packetLength) {
++            super("PacketTooLarge - " + packet.getClass().getSimpleName() + " is " + packetLength +". Max is " + MAX_PACKET_SIZE);
++            this.packet = packet;
++        }
++
++        public Packet<?> getPacket() {
++            return packet;
++        }
++    }
++    // Paper end
++
+     // $FF: synthetic method
+     protected void encode(ChannelHandlerContext channelhandlercontext, Packet<?> object, ByteBuf bytebuf) throws Exception { // Paper - decompiler fix
+         this.a(channelhandlercontext, (Packet)object, bytebuf);
+diff --git a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
+index 40ec398ee..ca6bcd22f 100644
+--- a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
++++ b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
+@@ -68,7 +68,7 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
+         this.f = packetdataserializer.readBoolean();
+         this.c = packetdataserializer.g();
+         int i = packetdataserializer.g();
+-        if (i > 2097152) {
++        if (i > 2097152) { // Paper - if this changes, update PacketEncoder
+             throw new RuntimeException("Chunk Packet trying to allocate too much memory on read.");
+         } else {
+             this.d = new byte[i];
+diff --git a/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java b/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java
+index 4d4835353..abdb21f6b 100644
+--- a/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java
++++ b/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java
+@@ -7,6 +7,16 @@ public class PacketPlayOutWindowItems implements Packet<PacketListenerPlayOut> {
+     private int a;
+     private List<ItemStack> b;
+ 
++    //Paper start
++    @Override
++    public boolean packetTooLarge(NetworkManager manager) {
++        for (int i = 0 ; i < this.b.size() ; i++) {
++            manager.sendPacket(new PacketPlayOutSetSlot(this.a, i, this.b.get(i)));
++        }
++        return true;
++    }
++    // Paper end
++
+     public PacketPlayOutWindowItems() {
+     }
+ 
+-- 
+2.19.1
+