From c5f21c24ee494a5b7a3e161a1f4af4cf6930564d Mon Sep 17 00:00:00 2001 From: Aikar 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 120416b30..065bede4c 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> { } 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 { 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 3448f6c53..484131e65 100644 --- a/src/main/java/net/minecraft/server/PacketEncoder.java +++ b/src/main/java/net/minecraft/server/PacketEncoder.java @@ -45,8 +45,31 @@ public class PacketEncoder extends MessageToByteEncoder> { 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 } 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 { 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 { private int a; private List 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() { } -- 2.20.0