Paper/Spigot-Server-Patches/0336-Handle-Large-Packets-disconnecting-client.patch
2020-02-10 22:35:46 -06:00

118 lines
4.8 KiB
Diff

From a3a1da7bb34c3864cf7153eb8aa544cfa5847f35 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 046196d54..d4aad8a5b 100644
--- a/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/src/main/java/net/minecraft/server/NetworkManager.java
@@ -97,6 +97,15 @@ 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.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 601d4d0fa..2d8e6a2f4 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<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/server/PacketEncoder.java b/src/main/java/net/minecraft/server/PacketEncoder.java
index 63c4dbd32..b0cfef52c 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<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/server/PacketPlayOutMapChunk.java b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
index 1fcbbd698..a0b87f89d 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<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/server/PacketPlayOutWindowItems.java b/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java
index f7c365567..631234324 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<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) {
--
2.25.0