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/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java index 2fda6f6965916e99e603ff87af4226b5ab8417ee..9ea4ce3aa6a43906eb7bf9593de0191a94242da2 100644 --- a/src/main/java/net/minecraft/server/NetworkManager.java +++ b/src/main/java/net/minecraft/server/NetworkManager.java @@ -12,6 +12,7 @@ import io.netty.channel.epoll.EpollEventLoopGroup; import io.netty.channel.local.LocalChannel; import io.netty.channel.local.LocalServerChannel; import io.netty.channel.nio.NioEventLoopGroup; +import io.netty.handler.codec.EncoderException; // Paper import io.netty.handler.timeout.TimeoutException; import io.netty.util.AttributeKey; import io.netty.util.concurrent.Future; @@ -97,6 +98,15 @@ public class NetworkManager extends SimpleChannelInboundHandler> { } public void exceptionCaught(ChannelHandlerContext channelhandlercontext, Throwable throwable) { + // Paper start + if (throwable instanceof 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.LOGGER.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 601d4d0fa2a0b3e90f81aed55a2d3473c66c7875..2d8e6a2f4a0c3c5d74a647d7164b0028781d3bf5 100644 --- a/src/main/java/net/minecraft/server/Packet.java +++ b/src/main/java/net/minecraft/server/Packet.java @@ -10,6 +10,12 @@ public interface Packet { void a(T t0); + // 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 63c4dbd327beb7b6ab42eb44650d68accd3b0de6..b0cfef52cbb5e23beae528668e4e98cedecf603c 100644 --- a/src/main/java/net/minecraft/server/PacketEncoder.java +++ b/src/main/java/net/minecraft/server/PacketEncoder.java @@ -49,7 +49,31 @@ 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 0ef4fbb19fc816f578ad741c4406790f4185093d..34e92e544f37167317d58af4242acde49e588673 100644 --- a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java +++ b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java @@ -79,7 +79,7 @@ public class PacketPlayOutMapChunk implements Packet { int i = packetdataserializer.i(); - 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.f = new byte[i]; diff --git a/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java b/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java index e32db2baf84dcb192800e6048cadf3511da28181..6fb3168fd6de0074b1b378e992e4706c50ae15ab 100644 --- a/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java +++ b/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java @@ -9,6 +9,15 @@ 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() {} public PacketPlayOutWindowItems(int i, NonNullList nonnulllist) {