PaperMC/CraftBukkit-Patches/0148-Limit-block-placement-interaction-packets.patch

From 9d0db6f7de036491b343ae39b3aebbb824248818 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/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 9491101..20c49e3 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -573,7 +573,20 @@ public class PlayerConnection implements PacketPlayInListener {
         }
     }
 
+    // Spigot start - limit place/interactions
+    private long lastPlace = -1;
+    private int packets = 0;
+
     public void a(PacketPlayInBlockPlace packetplayinblockplace) {
+        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
         WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
 
         // CraftBukkit start
@@ -616,10 +629,14 @@ public class PlayerConnection implements PacketPlayInListener {
 
             // CraftBukkit start
             int itemstackAmount = itemstack.count;
+            // Spigot start - skip the event if throttled
+            if (!throttled) {
             org.bukkit.event.player.PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(this.player, Action.RIGHT_CLICK_AIR, itemstack);
             if (event.useItemInHand() != Event.Result.DENY) {
                 this.player.playerInteractManager.useItem(this.player, this.player.world, itemstack);
             }
+            }
+            // Spigot end
 
             // CraftBukkit - notch decrements the counter by 1 in the above method with food,
             // snowballs and so forth, but he does it in a place that doesn't cause the
@@ -640,7 +657,7 @@ public class PlayerConnection implements PacketPlayInListener {
                 return;
             }
 
-            if (!this.player.playerInteractManager.interact(this.player, worldserver, itemstack, i, j, k, l, packetplayinblockplace.h(), packetplayinblockplace.i(), packetplayinblockplace.j())) {
+            if (throttled || !this.player.playerInteractManager.interact(this.player, worldserver, itemstack, i, j, k, l, packetplayinblockplace.h(), packetplayinblockplace.i(), packetplayinblockplace.j())) { // Spigot - skip the event if throttled
                 always = true; // force PacketPlayOutSetSlot to be sent to client to update ItemStack count
             }
             // CraftBukkit end
-- 
1.9.1