PaperMC/patches/server/0434-Limit-recipe-packets.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sat, 12 Dec 2020 23:45:28 +0000
Subject: [PATCH] Limit recipe packets


diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 1e6c8a23e892fc1c49da9538b435aa3eb0a28934..04de96af5415c3115703f5ab42e9fa3aa2ccee60 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -279,6 +279,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
     private final TickThrottler chatSpamThrottler = new TickThrottler(20, 200);
     private final TickThrottler tabSpamThrottler = new TickThrottler(io.papermc.paper.configuration.GlobalConfiguration.get().spamLimiter.tabSpamIncrement, io.papermc.paper.configuration.GlobalConfiguration.get().spamLimiter.tabSpamLimit); // Paper - configurable tab spam limits
     private final TickThrottler dropSpamThrottler = new TickThrottler(20, 1480);
+    private final TickThrottler recipeSpamPackets = new TickThrottler(io.papermc.paper.configuration.GlobalConfiguration.get().spamLimiter.recipeSpamIncrement, io.papermc.paper.configuration.GlobalConfiguration.get().spamLimiter.recipeSpamLimit);
     private double firstGoodX;
     private double firstGoodY;
     private double firstGoodZ;
@@ -395,6 +396,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
         this.keepConnectionAlive();
         this.chatSpamThrottler.tick();
         this.tabSpamThrottler.tick(); // Paper - configurable tab spam limits
+        this.recipeSpamPackets.tick(); // Paper - auto recipe limit
         this.dropSpamThrottler.tick();
         if (this.player.getLastActionTime() > 0L && this.server.getPlayerIdleTimeout() > 0 && Util.getMillis() - this.player.getLastActionTime() > (long) this.server.getPlayerIdleTimeout() * 1000L * 60L) {
             this.player.resetLastActionTime(); // CraftBukkit - SPIGOT-854
@@ -3155,6 +3157,14 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
 
     @Override
     public void handlePlaceRecipe(ServerboundPlaceRecipePacket packet) {
+        // Paper start - auto recipe limit
+        if (!org.bukkit.Bukkit.isPrimaryThread()) {
+            if (!this.recipeSpamPackets.isIncrementAndUnderThreshold()) {
+                this.disconnect(net.minecraft.network.chat.Component.translatable("disconnect.spam"));
+                return;
+            }
+        }
+        // Paper end - auto recipe limit
         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.serverLevel());
         this.player.resetLastActionTime();
         if (!this.player.isSpectator() && this.player.containerMenu.containerId == packet.containerId()) {