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Handle Excessive Signs in Chunks creating too large of packets

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Also adds a limit to stop sending Sign data to client after 500
signs per chunk to limit client lag.

Use -DPaper.excessiveSignsLimit=500 to configure that limit, or -1
to disable the limit and let your players be abused.

fixes #1878
This commit is contained in:
Aikar 2019-03-02 15:29:46 -05:00
parent 420ce3aaed
commit a684cde66b
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GPG Key ID: 401ADFC9891FAAFE
1 changed files with 89 additions and 0 deletions
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Spigot-Server-Patches/0422-Handle-Excessive-Signs-in-Chunks-creating-too-large-.patch Normal file
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@ -0,0 +1,89 @@
From 22c5692294c0a99baaf40a6687db8acbe474dee9 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 2 Mar 2019 14:55:01 -0500
Subject: [PATCH] Handle Excessive Signs in Chunks creating too large of
packets
Also adds a limit to stop sending Sign data to client after 500
signs per chunk to limit client lag.
Use -DPaper.excessiveSignsLimit=500 to configure that limit, or -1
to disable the limit and let your players be abused.
diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
index 553637239c..30f646e421 100644
--- a/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/src/main/java/net/minecraft/server/NetworkManager.java
@@ -221,6 +221,15 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
});
}
+ // Paper start
+ java.util.List<Packet> extraPackets = packet.getExtraPackets();
+ if (extraPackets != null && !extraPackets.isEmpty()) {
+ for (Packet extraPacket : extraPackets) {
+ this.dispatchPacket(extraPacket, genericfuturelistener);
+ }
+ }
+ // Paper end
+
}
// Paper start - Async-Anti-Xray - Stop dispatching further packets and return false if the peeked packet is a chunk packet which is not ready
diff --git a/src/main/java/net/minecraft/server/Packet.java b/src/main/java/net/minecraft/server/Packet.java
index 2d8e6a2f4a..8d0965a053 100644
--- a/src/main/java/net/minecraft/server/Packet.java
+++ b/src/main/java/net/minecraft/server/Packet.java
@@ -11,6 +11,7 @@ public interface Packet<T extends PacketListener> {
void a(T t0);
// Paper start
+ default java.util.List<Packet> getExtraPackets() { return null; }
default boolean packetTooLarge(NetworkManager manager) {
return false;
}
diff --git a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
index 4a57e8a3ec..eb54bdb642 100644
--- a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
+++ b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
@@ -23,6 +23,13 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
this.ready = true; // Paper - Async-Anti-Xray - Set the ready flag to true
}
+ // Paper start
+ private final java.util.List<Packet> extraPackets = new java.util.ArrayList<>();
+ private static final int SKIP_EXCESSIVE_SIGNS_LIMIT = Integer.getInteger("Paper.excessiveSignsLimit", 500);
+ public java.util.List<Packet> getExtraPackets() {
+ return extraPackets;
+ }
+ // Paper end
public PacketPlayOutMapChunk(Chunk chunk, int i) {
ChunkPacketInfo<IBlockData> chunkPacketInfo = chunk.world.chunkPacketBlockController.getChunkPacketInfo(this, chunk, i); // Paper - Anti-Xray - Add chunk packet info
this.a = chunk.locX;
@@ -41,6 +48,7 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
this.c = this.writeChunk(new PacketDataSerializer(this.h()), chunk, flag, i, chunkPacketInfo); // Paper - Anti-Xray - Add chunk packet info
this.e = Lists.newArrayList();
Iterator iterator = chunk.getTileEntities().entrySet().iterator();
+ int totalSigns = 0; // Paper
while (iterator.hasNext()) {
Entry<BlockPosition, TileEntity> entry = (Entry) iterator.next();
@@ -49,6 +57,15 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
int j = blockposition.getY() >> 4;
if (this.f() || (i & 1 << j) != 0) {
+ // Paper start - send signs separately
+ if (tileentity instanceof TileEntitySign) {
+ if (SKIP_EXCESSIVE_SIGNS_LIMIT < 0 || ++totalSigns < SKIP_EXCESSIVE_SIGNS_LIMIT) {
+ extraPackets.add(tileentity.getUpdatePacket());
+ }
+ continue;
+ }
+ // Paper end
+
NBTTagCompound nbttagcompound = tileentity.aa_();
if (tileentity instanceof TileEntitySkull) { TileEntitySkull.sanitizeTileEntityUUID(nbttagcompound); } // Paper
--
2.20.1