spigot/CraftBukkit-Patches/0068-Limit-block-placement-interaction-packets.patch

From a6143479c8f66d0e140e13c13e2d21a03c85868c 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/network/protocol/game/PacketPlayInBlockPlace.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayInBlockPlace.java
index d6ceb631c..8a747926b 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayInBlockPlace.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayInBlockPlace.java
@@ -9,6 +9,7 @@ import net.minecraft.world.EnumHand;
 public class PacketPlayInBlockPlace implements Packet<PacketListenerPlayIn> {
 
     private EnumHand a;
+    public long timestamp; // Spigot
 
     public PacketPlayInBlockPlace() {}
 
@@ -18,6 +19,7 @@ public class PacketPlayInBlockPlace implements Packet<PacketListenerPlayIn> {
 
     @Override
     public void a(PacketDataSerializer packetdataserializer) throws IOException {
+        this.timestamp = System.currentTimeMillis(); // Spigot
         this.a = (EnumHand) packetdataserializer.a(EnumHand.class);
     }
 
diff --git a/src/main/java/net/minecraft/network/protocol/game/PacketPlayInUseItem.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayInUseItem.java
index 1083e7d35..00f33483c 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayInUseItem.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayInUseItem.java
@@ -11,11 +11,13 @@ public class PacketPlayInUseItem implements Packet<PacketListenerPlayIn> {
 
     private MovingObjectPositionBlock a;
     private EnumHand b;
+    public long timestamp;
 
     public PacketPlayInUseItem() {}
 
     @Override
     public void a(PacketDataSerializer packetdataserializer) throws IOException {
+        this.timestamp = System.currentTimeMillis(); // Spigot
         this.b = (EnumHand) packetdataserializer.a(EnumHand.class);
         this.a = packetdataserializer.r();
     }
diff --git a/src/main/java/net/minecraft/server/network/PlayerConnection.java b/src/main/java/net/minecraft/server/network/PlayerConnection.java
index 9ab5c6bed..53b4c8a0c 100644
--- a/src/main/java/net/minecraft/server/network/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/network/PlayerConnection.java
@@ -1458,10 +1458,30 @@ public class PlayerConnection implements PacketListenerPlayIn {
         }
     }
 
+    // Spigot start - limit place/interactions
+    private int limitedPackets;
+    private long lastLimitedPacket = -1;
+
+    private boolean checkLimit(long timestamp) {
+        if (lastLimitedPacket != -1 && timestamp - lastLimitedPacket < 30 && limitedPackets++ >= 4) {
+            return false;
+        }
+
+        if (lastLimitedPacket == -1 || timestamp - lastLimitedPacket >= 30) {
+            lastLimitedPacket = timestamp;
+            limitedPackets = 0;
+            return true;
+        }
+
+        return true;
+    }
+    // Spigot end
+
     @Override
     public void a(PacketPlayInUseItem packetplayinuseitem) {
         PlayerConnectionUtils.ensureMainThread(packetplayinuseitem, this, this.player.getWorldServer());
         if (this.player.isFrozen()) return; // CraftBukkit
+        if (!checkLimit(packetplayinuseitem.timestamp)) return; // Spigot - check limit
         WorldServer worldserver = this.player.getWorldServer();
         EnumHand enumhand = packetplayinuseitem.b();
         ItemStack itemstack = this.player.b(enumhand);
@@ -1504,6 +1524,7 @@ public class PlayerConnection implements PacketListenerPlayIn {
     public void a(PacketPlayInBlockPlace packetplayinblockplace) {
         PlayerConnectionUtils.ensureMainThread(packetplayinblockplace, this, this.player.getWorldServer());
         if (this.player.isFrozen()) return; // CraftBukkit
+        if (!checkLimit(packetplayinblockplace.timestamp)) return; // Spigot - check limit
         WorldServer worldserver = this.player.getWorldServer();
         EnumHand enumhand = packetplayinblockplace.b();
         ItemStack itemstack = this.player.b(enumhand);
-- 
2.25.1