From 0000000000000000000000000000000000000000 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/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java index 837cc21af01e691eb9e877479a67ce94d5b2bc06..8af273d3aa3989e148ca93528754a13e1d1bf414 100644 --- a/src/main/java/net/minecraft/network/Connection.java +++ b/src/main/java/net/minecraft/network/Connection.java @@ -166,6 +166,22 @@ public class Connection extends SimpleChannelInboundHandler> { } public void exceptionCaught(ChannelHandlerContext channelhandlercontext, Throwable throwable) { + // Paper start + if (throwable instanceof io.netty.handler.codec.EncoderException && throwable.getCause() instanceof PacketEncoder.PacketTooLargeException packetTooLargeException) { + final Packet packet = packetTooLargeException.getPacket(); + final io.netty.util.Attribute> codecDataAttribute = channelhandlercontext.channel().attr(packetTooLargeException.codecKey); + if (packet.packetTooLarge(this)) { + ProtocolSwapHandler.swapProtocolIfNeeded(codecDataAttribute, packet); + return; + } else if (packet.isSkippable()) { + Connection.LOGGER.debug("Skipping packet due to errors", throwable.getCause()); + ProtocolSwapHandler.swapProtocolIfNeeded(codecDataAttribute, packet); + return; + } else { + throwable = throwable.getCause(); + } + } + // Paper end if (throwable instanceof SkipPacketException) { Connection.LOGGER.debug("Skipping packet due to errors", throwable.getCause()); } else { diff --git a/src/main/java/net/minecraft/network/PacketEncoder.java b/src/main/java/net/minecraft/network/PacketEncoder.java index 3d359f80f52bff6f19fcb484f491a874f9dcff27..45b4f1c295eda2fcc5067a4b21de247218ef117f 100644 --- a/src/main/java/net/minecraft/network/PacketEncoder.java +++ b/src/main/java/net/minecraft/network/PacketEncoder.java @@ -41,7 +41,7 @@ public class PacketEncoder extends MessageToByteEncoder> { int j = friendlyByteBuf.writerIndex(); packet.write(friendlyByteBuf); int k = friendlyByteBuf.writerIndex() - j; - if (k > 8388608) { + if (false && k > 8388608) { // Paper - disable throw new IllegalArgumentException("Packet too big (is " + k + ", should be less than 8388608): " + packet); } @@ -54,10 +54,35 @@ public class PacketEncoder extends MessageToByteEncoder> { throw var13; } finally { + // Paper start + int packetLength = friendlyByteBuf.readableBytes(); + if (packetLength > MAX_PACKET_SIZE) { + throw new PacketTooLargeException(packet, this.codecKey, packetLength); + } + // Paper end ProtocolSwapHandler.swapProtocolIfNeeded(attribute, packet); } } } } + + // Paper start + private static int MAX_PACKET_SIZE = 8388608; + + public static class PacketTooLargeException extends RuntimeException { + private final Packet packet; + public final AttributeKey> codecKey; + + PacketTooLargeException(Packet packet, AttributeKey> codecKey, int packetLength) { + super("PacketTooLarge - " + packet.getClass().getSimpleName() + " is " + packetLength + ". Max is " + MAX_PACKET_SIZE); + this.packet = packet; + this.codecKey = codecKey; + } + + public Packet getPacket() { + return this.packet; + } + } + // Paper end } diff --git a/src/main/java/net/minecraft/network/protocol/Packet.java b/src/main/java/net/minecraft/network/protocol/Packet.java index 700418bb0c9fbed3f161611881b1e222248ca4eb..cc658a61065d5c0021a4b88fa58b40211b94f8ec 100644 --- a/src/main/java/net/minecraft/network/protocol/Packet.java +++ b/src/main/java/net/minecraft/network/protocol/Packet.java @@ -10,6 +10,12 @@ public interface Packet { void handle(T listener); + // Paper start + default boolean packetTooLarge(net.minecraft.network.Connection manager) { + return false; + } + // Paper end + default boolean isSkippable() { return false; } diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundContainerSetContentPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundContainerSetContentPacket.java index 0e076173033278587df2b5dfbd01cc9005651eb5..dbd8b9b09b82c1b75e8be9dc7416d9f0863c8c87 100644 --- a/src/main/java/net/minecraft/network/protocol/game/ClientboundContainerSetContentPacket.java +++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundContainerSetContentPacket.java @@ -31,6 +31,16 @@ public class ClientboundContainerSetContentPacket implements Packet 2097152) { + if (i > 2097152) { // Paper - diff on change - if this changes, update PacketEncoder throw new RuntimeException("Chunk Packet trying to allocate too much memory on read."); } else { this.buffer = new byte[i];