Paper/Unmapped-Spigot-Server-Patches/0314-Handle-Large-Packets-disconnecting-client.patch
2021-06-11 06:35:46 -05:00

131 lines
5.9 KiB
Diff

From 0000000000000000000000000000000000000000 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/network/NetworkManager.java b/src/main/java/net/minecraft/network/NetworkManager.java
index 297820baef99e97e1216a64c527219e9ccc3e320..dc788d75a6a34fbbae990609bfbbd13ca6cdee5a 100644
--- a/src/main/java/net/minecraft/network/NetworkManager.java
+++ b/src/main/java/net/minecraft/network/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;
@@ -107,6 +108,15 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
}
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/network/PacketEncoder.java b/src/main/java/net/minecraft/network/PacketEncoder.java
index 2f6da89d6b25ba5144ec15b1bf0e8ed13278e85e..037d989522d24a55eced1c462d40a6dc2a7ecfce 100644
--- a/src/main/java/net/minecraft/network/PacketEncoder.java
+++ b/src/main/java/net/minecraft/network/PacketEncoder.java
@@ -53,7 +53,31 @@ 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
}
diff --git a/src/main/java/net/minecraft/network/protocol/Packet.java b/src/main/java/net/minecraft/network/protocol/Packet.java
index cd4493a023748264748d4e892815f14d8a7bd7f6..0783b0777c8d7788bbf6780b464b709bf6dc2191 100644
--- a/src/main/java/net/minecraft/network/protocol/Packet.java
+++ b/src/main/java/net/minecraft/network/protocol/Packet.java
@@ -12,6 +12,12 @@ public interface Packet<T extends PacketListener> {
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/network/protocol/game/PacketPlayOutMapChunk.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutMapChunk.java
index 152118729b1a95dcae05d32aa4289034ba394226..0059ede4ba3ff271d47dd38ea87fddc2399aa008 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutMapChunk.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutMapChunk.java
@@ -91,7 +91,7 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
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/network/protocol/game/PacketPlayOutWindowItems.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutWindowItems.java
index b90e35a0099a2482f8fc2998bd079fc2fe6439e6..e540f95a370c627d3d81e0d3670049d01923559d 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutWindowItems.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutWindowItems.java
@@ -4,6 +4,7 @@ import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import net.minecraft.core.NonNullList;
+import net.minecraft.network.NetworkManager;
import net.minecraft.network.PacketDataSerializer;
import net.minecraft.network.protocol.Packet;
import net.minecraft.world.item.ItemStack;
@@ -13,6 +14,15 @@ 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() {}
public PacketPlayOutWindowItems(int i, NonNullList<ItemStack> nonnulllist) {