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Handle Large Packets disconnecting client

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If a players inventory is too big to send in a single packet,
split the inventory set into multiple packets instead.
This commit is contained in:
Aikar 2018-11-27 21:42:42 -05:00
parent cdba821b4e
commit 0d7513c4a4
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GPG key ID: 401ADFC9891FAAFE
1 changed files with 119 additions and 0 deletions
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Spigot-Server-Patches/0415-Handle-Large-Packets-disconnecting-client.patch Normal file
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@ -0,0 +1,119 @@
From 030ce5b54e606115c3cce607fea5ab7bdd669242 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 97a9dffe6..2f887932b 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<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.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<T extends PacketListener> {
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 c20911c96..c22c3eebc 100644
--- a/src/main/java/net/minecraft/server/PacketEncoder.java
+++ b/src/main/java/net/minecraft/server/PacketEncoder.java
@@ -45,10 +45,32 @@ 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
+
// $FF: synthetic method
protected void encode(ChannelHandlerContext channelhandlercontext, Packet<?> object, ByteBuf bytebuf) throws Exception { // Paper - decompiler fix
this.a(channelhandlercontext, (Packet)object, bytebuf);
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<PacketListenerPlayOut> {
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<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() {
}
--
2.19.1