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89d51d5f29
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
85 lines
4.7 KiB
Diff
85 lines
4.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Mariell Hoversholm <proximyst@proximyst.com>
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Date: Sun, 24 Oct 2021 16:20:31 -0400
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Subject: [PATCH] Add Raw Byte Entity Serialization
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== AT ==
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public net.minecraft.world.entity.Entity setLevel(Lnet/minecraft/world/level/Level;)V
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diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
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index 822666e1199e0851136d88b2b556d8d17843d902..e6ef67a7a2eab5314c95e751895b4d4ce71c91b8 100644
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--- a/src/main/java/net/minecraft/world/entity/Entity.java
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+++ b/src/main/java/net/minecraft/world/entity/Entity.java
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@@ -2078,6 +2078,15 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S
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}
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}
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+ // Paper start - Entity serialization api
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+ public boolean serializeEntity(CompoundTag compound) {
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+ List<Entity> pass = new java.util.ArrayList<>(this.getPassengers());
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+ this.passengers = ImmutableList.of();
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+ boolean result = save(compound);
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+ this.passengers = ImmutableList.copyOf(pass);
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+ return result;
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+ }
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+ // Paper end - Entity serialization api
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public boolean save(CompoundTag nbt) {
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return this.isPassenger() ? false : this.saveAsPassenger(nbt);
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}
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diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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index 07158732dd6a5b7d622b7f2ea10ca87b50365b8a..411e2eed16d5b774900fc12f5ad782ab229dde97 100644
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--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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@@ -1077,5 +1077,15 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
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}
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return set;
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}
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+
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+ @Override
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+ public boolean spawnAt(Location location, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason reason) {
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+ Preconditions.checkNotNull(location, "location cannot be null");
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+ Preconditions.checkNotNull(reason, "reason cannot be null");
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+ this.entity.setLevel(((CraftWorld) location.getWorld()).getHandle());
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+ this.entity.setPos(location.getX(), location.getY(), location.getZ());
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+ this.entity.setRot(location.getYaw(), location.getPitch());
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+ return !this.entity.valid && this.entity.level().addFreshEntity(this.entity, reason);
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+ }
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// Paper end
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}
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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index 609b103cb9af3b0554bf1116306874fe98c8534c..3f582c5653e13875cce4ef8ecd279d8a3d2b2dc2 100644
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--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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@@ -499,6 +499,32 @@ public final class CraftMagicNumbers implements UnsafeValues {
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return CraftItemStack.asCraftMirror(net.minecraft.world.item.ItemStack.of(compound));
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}
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+ @Override
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+ public byte[] serializeEntity(org.bukkit.entity.Entity entity) {
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+ Preconditions.checkNotNull(entity, "null cannot be serialized");
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+ Preconditions.checkArgument(entity instanceof org.bukkit.craftbukkit.entity.CraftEntity, "only CraftEntities can be serialized");
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+
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+ CompoundTag compound = new CompoundTag();
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+ ((org.bukkit.craftbukkit.entity.CraftEntity) entity).getHandle().serializeEntity(compound);
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+ return serializeNbtToBytes(compound);
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+ }
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+
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+ @Override
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+ public org.bukkit.entity.Entity deserializeEntity(byte[] data, org.bukkit.World world, boolean preserveUUID) {
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+ Preconditions.checkNotNull(data, "null cannot be deserialized");
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+ Preconditions.checkArgument(data.length > 0, "cannot deserialize nothing");
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+
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+ CompoundTag compound = deserializeNbtFromBytes(data);
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+ int dataVersion = compound.getInt("DataVersion");
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+ compound = (CompoundTag) MinecraftServer.getServer().fixerUpper.update(References.ENTITY, new Dynamic<>(NbtOps.INSTANCE, compound), dataVersion, this.getDataVersion()).getValue();
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+ if (!preserveUUID) {
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+ // Generate a new UUID so we don't have to worry about deserializing the same entity twice
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+ compound.remove("UUID");
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+ }
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+ return net.minecraft.world.entity.EntityType.create(compound, ((org.bukkit.craftbukkit.CraftWorld) world).getHandle())
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+ .orElseThrow(() -> new IllegalArgumentException("An ID was not found for the data. Did you downgrade?")).getBukkitEntity();
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+ }
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+
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private byte[] serializeNbtToBytes(CompoundTag compound) {
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compound.putInt("DataVersion", getDataVersion());
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java.io.ByteArrayOutputStream outputStream = new java.io.ByteArrayOutputStream();
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