1 files changed, 46 insertions, 0 deletions
diff --git a/patches/server/0191-Block-Enderpearl-Travel-Exploit.patch b/patches/server/0191-Block-Enderpearl-Travel-Exploit.patch
new file mode 100644
index 0000000000..e1163117f2
--- /dev/null
+++ b/patches/server/0191-Block-Enderpearl-Travel-Exploit.patch
@@ -0,0 +1,46 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <[email protected]>
+Date: Mon, 30 Apr 2018 17:15:26 -0400
+Subject: [PATCH] Block Enderpearl Travel Exploit
+
+Players are able to use alt accounts and enderpearls to travel
+long distances utilizing the pearls in unloaded chunks and loading
+the chunk later when convenient.
+
+This disables that by not saving the thrower when the chunk is unloaded.
+
+This is mainly useful for survival servers that do not allow freeform teleporting.
+
+== AT ==
+public net.minecraft.world.entity.projectile.Projectile cachedOwner
+public net.minecraft.world.entity.projectile.Projectile ownerUUID
+
+diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
+index f2016ed77a2239bdc597175c24ce4427a808d1a6..7be0547f6225a6be6ca1037f63f4aff8759b5dc4 100644
+--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
++++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
+@@ -2149,6 +2149,12 @@ public class ServerLevel extends Level implements WorldGenLevel {
+ 
+         public void onTickingEnd(Entity entity) {
+             ServerLevel.this.entityTickList.remove(entity);
++            // Paper start - Reset pearls when they stop being ticked
++            if (paperConfig().fixes.disableUnloadedChunkEnderpearlExploit && entity instanceof net.minecraft.world.entity.projectile.ThrownEnderpearl pearl) {
++                pearl.cachedOwner = null;
++                pearl.ownerUUID = null;
++            }
++            // Paper end - Reset pearls when they stop being ticked
+         }
+ 
+         public void onTrackingStart(Entity entity) {
+diff --git a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
+index 1e7224d070fc48d93ce0c4e832d94c6a50019249..5e9ef75a14a91f01a1ae5b3fb591d7258740a75d 100644
+--- a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
++++ b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
+@@ -102,6 +102,7 @@ public abstract class Projectile extends Entity implements TraceableEntity {
+         if (nbt.hasUUID("Owner")) {
+             this.ownerUUID = nbt.getUUID("Owner");
+             this.cachedOwner = null;
++            if (this instanceof ThrownEnderpearl && this.level() != null && this.level().paperConfig().fixes.disableUnloadedChunkEnderpearlExploit) { this.ownerUUID = null; } // Paper - Reset pearls when they stop being ticked; Don't store shooter name for pearls to block enderpearl travel exploit
+         }
+ 
+         this.leftOwner = nbt.getBoolean("LeftOwner");