1 files changed, 49 insertions, 0 deletions
diff --git a/patches/server/1057-Block-Enderpearl-Travel-Exploit.patch b/patches/server/1057-Block-Enderpearl-Travel-Exploit.patch
new file mode 100644
index 0000000000..1ce0fb851b
--- /dev/null
+++ b/patches/server/1057-Block-Enderpearl-Travel-Exploit.patch
@@ -0,0 +1,49 @@
+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.
+
+Note: Currently removed as enderpearls are ticked as long as their owner is online in 1.21.2.
+Might be worth to re-add once an option to disable the above vanilla mechanic is added, to
+fully prevent enderpearl travel exploits.
+
+== AT ==
+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 5979e8d25eaddf990ded79bcf6485cc0612faa63..0a46bf03f9a55c7453f042cba6f448d4d0bcd1e6 100644
+--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
++++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
+@@ -2664,6 +2664,12 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
+ 
+         public void onTickingEnd(Entity entity) {
+             ServerLevel.this.entityTickList.remove(entity);
++            // Paper start - Reset pearls when they stop being ticked
++            if (ServerLevel.this.paperConfig().fixes.disableUnloadedChunkEnderpearlExploit && ServerLevel.this.paperConfig().misc.legacyEnderPearlBehavior && 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 bf2e79c50092acd13e97ab6e32471a9c527a524e..6c2d4d6f3a36ab452dfd3c33f66e54f152906639 100644
+--- a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
++++ b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
+@@ -134,6 +134,7 @@ public abstract class Projectile extends Entity implements TraceableEntity {
+     protected void readAdditionalSaveData(CompoundTag nbt) {
+         if (nbt.hasUUID("Owner")) {
+             this.setOwnerThroughUUID(nbt.getUUID("Owner"));
++            if (this instanceof ThrownEnderpearl && this.level() != null && this.level().paperConfig().fixes.disableUnloadedChunkEnderpearlExploit && this.level().paperConfig().misc.legacyEnderPearlBehavior) { 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");