papermc/CraftBukkit-Patches/0112-Limit-block-placement-interaction-packets.patch

From 80a3ac9101388c99787260b3617c8329199848cd Mon Sep 17 00:00:00 2001
From: Thinkofdeath <thinkofdeath@spigotmc.org>
Date: Sun, 29 Jun 2014 21:10:34 +0100
Subject: [PATCH] Limit block placement/interaction packets


diff --git a/src/main/java/net/minecraft/server/PacketPlayInArmAnimation.java b/src/main/java/net/minecraft/server/PacketPlayInArmAnimation.java
deleted file mode 100644
index cb0356e..0000000
--- a/src/main/java/net/minecraft/server/PacketPlayInArmAnimation.java
+++ /dev/null
@@ -1,30 +0,0 @@
-package net.minecraft.server;
-
-import java.io.IOException;
-
-public class PacketPlayInArmAnimation implements Packet<PacketListenerPlayIn> {
-
-    private EnumHand a;
-
-    public PacketPlayInArmAnimation() {}
-
-    public PacketPlayInArmAnimation(EnumHand enumhand) {
-        this.a = enumhand;
-    }
-
-    public void a(PacketDataSerializer packetdataserializer) throws IOException {
-        this.a = (EnumHand) packetdataserializer.a(EnumHand.class);
-    }
-
-    public void b(PacketDataSerializer packetdataserializer) throws IOException {
-        packetdataserializer.a((Enum) this.a);
-    }
-
-    public void a(PacketListenerPlayIn packetlistenerplayin) {
-        packetlistenerplayin.a(this);
-    }
-
-    public EnumHand a() {
-        return this.a;
-    }
-}
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index fec19f1..f354985 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -898,6 +898,10 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
 
     }
 
+    // Spigot start - limit place/interactions
+    private long lastPlace = -1;
+    private int packets = 0;
+    // Spigot end
     public void a(PacketPlayInBlockPlace packetplayinblockplace) {
         PlayerConnectionUtils.ensureMainThread(packetplayinblockplace, this, this.player.x());
         if (this.player.dead) return; // CraftBukkit
@@ -906,7 +910,17 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         ItemStack itemstack = this.player.b(enumhand);
 
         this.player.resetIdleTimer();
-        if (itemstack != null) {
+        // Spigot start
+        boolean throttled = false;
+        if (lastPlace != -1 && packetplayinblockplace.timestamp - lastPlace < 30 && packets++ >= 4) {
+            throttled = true;
+        } else if ( packetplayinblockplace.timestamp - lastPlace >= 30 || lastPlace == -1 )
+        {
+            lastPlace = packetplayinblockplace.timestamp;
+            packets = 0;
+        }
+        // Spigot end
+        if (!throttled && itemstack != null) { // Spigot - skip the event if throttled
             // CraftBukkit start
             // Raytrace to look for 'rogue armswings'
             float f1 = this.player.pitch;
-- 
2.5.0