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Paper/patches/server/0970-Dont-resend-blocks-on-interactions.patch
Owen 89d51d5f29
Allow enabling sand duping (#10191) 
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.
2024-03-03 17:05:34 -05:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Tue, 27 Jun 2023 21:09:11 -0400
Subject: [PATCH] Dont resend blocks on interactions
In general, the client now has an acknowledgment system which will prevent block changes made by the client to be reverted correctly.
It should be noted that this system does not yet support block entities, so those still need to resynced when needed.
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
index d0ca98c3f9ea5c8cb1053da6b17e9a90c86b3ae7..5063eb6d4a24600262c32d2c9eb5fb5bf8fa354e 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -199,7 +199,7 @@ public class ServerPlayerGameMode {
PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(this.player, Action.LEFT_CLICK_BLOCK, pos, direction, this.player.getInventory().getSelected(), InteractionHand.MAIN_HAND);
if (event.isCancelled()) {
// Let the client know the block still exists
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+ // this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos)); // Paper - Don't resync blocks
// Update any tile entity data for this block
capturedBlockEntity = true; // Paper - Send block entities after destroy prediction
return;
@@ -214,7 +214,7 @@ public class ServerPlayerGameMode {
// Spigot start - handle debug stick left click for non-creative
if (this.player.getMainHandItem().is(net.minecraft.world.item.Items.DEBUG_STICK)
&& ((net.minecraft.world.item.DebugStickItem) net.minecraft.world.item.Items.DEBUG_STICK).handleInteraction(this.player, this.level.getBlockState(pos), this.level, pos, false, this.player.getMainHandItem())) {
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+ // this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos)); // Paper - Don't resync block
return;
}
// Spigot end
@@ -232,15 +232,17 @@ public class ServerPlayerGameMode {
// CraftBukkit start - Swings at air do *NOT* exist.
if (event.useInteractedBlock() == Event.Result.DENY) {
// If we denied a door from opening, we need to send a correcting update to the client, as it already opened the door.
- BlockState data = this.level.getBlockState(pos);
- if (data.getBlock() instanceof DoorBlock) {
- // For some reason *BOTH* the bottom/top part have to be marked updated.
- boolean bottom = data.getValue(DoorBlock.HALF) == DoubleBlockHalf.LOWER;
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, bottom ? pos.above() : pos.below()));
- } else if (data.getBlock() instanceof TrapDoorBlock) {
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
- }
+ // Paper start - Don't resync blocks
+ //BlockState data = this.level.getBlockState(pos);
+ //if (data.getBlock() instanceof DoorBlock) {
+ // // For some reason *BOTH* the bottom/top part have to be marked updated.
+ // boolean bottom = data.getValue(DoorBlock.HALF) == DoubleBlockHalf.LOWER;
+ // this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+ // this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, bottom ? pos.above() : pos.below()));
+ //} else if (data.getBlock() instanceof TrapDoorBlock) {
+ // this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+ //}
+ // Paper end - Don't resync blocks
} else if (!iblockdata.isAir()) {
iblockdata.attack(this.level, pos, this.player);
f = iblockdata.getDestroyProgress(this.player, this.player.level(), pos);
@@ -249,7 +251,7 @@ public class ServerPlayerGameMode {
if (event.useItemInHand() == Event.Result.DENY) {
// If we 'insta destroyed' then the client needs to be informed.
if (f > 1.0f) {
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+ // this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos)); // Paper - Don't resync blocks
}
return;
}
@@ -257,7 +259,7 @@ public class ServerPlayerGameMode {
if (blockEvent.isCancelled()) {
// Let the client know the block still exists
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+ // this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos)); // Paper - Don't resync block
return;
}
@@ -348,7 +350,7 @@ public class ServerPlayerGameMode {
// Tell client the block is gone immediately then process events
// Don't tell the client if its a creative sword break because its not broken!
- if (this.level.getBlockEntity(pos) == null && !isSwordNoBreak) {
+ if (false && this.level.getBlockEntity(pos) == null && !isSwordNoBreak) { // Paper - Don't resync block
ClientboundBlockUpdatePacket packet = new ClientboundBlockUpdatePacket(pos, Blocks.AIR.defaultBlockState());
this.player.connection.send(packet);
}
@@ -374,13 +376,15 @@ public class ServerPlayerGameMode {
if (isSwordNoBreak) {
return false;
}
+ // Paper start - Don't resync blocks
// Let the client know the block still exists
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+ //this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
// Brute force all possible updates
- for (Direction dir : Direction.values()) {
- this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos.relative(dir)));
- }
+ //for (Direction dir : Direction.values()) {
+ // this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos.relative(dir)));
+ //}
+ // Paper end - Don't resync blocks
// Update any tile entity data for this block
if (!captureSentBlockEntities) { // Paper - Send block entities after destroy prediction
@@ -537,16 +541,18 @@ public class ServerPlayerGameMode {
if (event.useInteractedBlock() == Event.Result.DENY) {
// If we denied a door from opening, we need to send a correcting update to the client, as it already opened the door.
if (iblockdata.getBlock() instanceof DoorBlock) {
- boolean bottom = iblockdata.getValue(DoorBlock.HALF) == DoubleBlockHalf.LOWER;
- player.connection.send(new ClientboundBlockUpdatePacket(world, bottom ? blockposition.above() : blockposition.below()));
+ // Paper start - Don't resync blocks
+ // boolean bottom = iblockdata.getValue(DoorBlock.HALF) == DoubleBlockHalf.LOWER;
+ // player.connection.send(new ClientboundBlockUpdatePacket(world, bottom ? blockposition.above() : blockposition.below()));
+ // Paper end - Don't resync blocks
} else if (iblockdata.getBlock() instanceof CakeBlock) {
player.getBukkitEntity().sendHealthUpdate(); // SPIGOT-1341 - reset health for cake
} else if (this.interactItemStack.getItem() instanceof DoubleHighBlockItem) {
// send a correcting update to the client, as it already placed the upper half of the bisected item
- player.connection.send(new ClientboundBlockUpdatePacket(world, blockposition.relative(hitResult.getDirection()).above()));
+ //player.connection.send(new ClientboundBlockUpdatePacket(world, blockposition.relative(hitResult.getDirection()).above())); // Paper - Don't resync blocks
// send a correcting update to the client for the block above as well, this because of replaceable blocks (such as grass, sea grass etc)
- player.connection.send(new ClientboundBlockUpdatePacket(world, blockposition.above()));
+ //player.connection.send(new ClientboundBlockUpdatePacket(world, blockposition.above())); // Paper - Don't resync blocks
// Paper start - extend Player Interact cancellation // TODO: consider merging this into the extracted method
} else if (iblockdata.is(Blocks.STRUCTURE_BLOCK) || iblockdata.getBlock() instanceof net.minecraft.world.level.block.CommandBlock) {
player.connection.send(new net.minecraft.network.protocol.game.ClientboundContainerClosePacket(this.player.containerMenu.containerId));
diff --git a/src/main/java/net/minecraft/world/item/BucketItem.java b/src/main/java/net/minecraft/world/item/BucketItem.java
index 4b9e726e6ac255e743479d5c2e0cdb98464399a4..6371f326fc86cfc53e39bf8ed13b646f7705fbbc 100644
--- a/src/main/java/net/minecraft/world/item/BucketItem.java
+++ b/src/main/java/net/minecraft/world/item/BucketItem.java
@@ -77,7 +77,7 @@ public class BucketItem extends Item implements DispensibleContainerItem {
PlayerBucketFillEvent event = CraftEventFactory.callPlayerBucketFillEvent((ServerLevel) world, user, blockposition, blockposition, movingobjectpositionblock.getDirection(), itemstack, dummyFluid.getItem(), hand);
if (event.isCancelled()) {
- ((ServerPlayer) user).connection.send(new ClientboundBlockUpdatePacket(world, blockposition)); // SPIGOT-5163 (see PlayerInteractManager)
+ // ((ServerPlayer) user).connection.send(new ClientboundBlockUpdatePacket(world, blockposition)); // SPIGOT-5163 (see PlayerInteractManager) // Paper - Don't resend blocks
((ServerPlayer) user).getBukkitEntity().updateInventory(); // SPIGOT-4541
return InteractionResultHolder.fail(itemstack);
}
@@ -186,7 +186,7 @@ public class BucketItem extends Item implements DispensibleContainerItem {
if (flag2 && entityhuman != null) {
PlayerBucketEmptyEvent event = CraftEventFactory.callPlayerBucketEmptyEvent((ServerLevel) world, entityhuman, blockposition, clicked, enumdirection, itemstack, enumhand);
if (event.isCancelled()) {
- ((ServerPlayer) entityhuman).connection.send(new ClientboundBlockUpdatePacket(world, blockposition)); // SPIGOT-4238: needed when looking through entity
+ // ((ServerPlayer) entityhuman).connection.send(new ClientboundBlockUpdatePacket(world, blockposition)); // SPIGOT-4238: needed when looking through entity // Paper - Don't resend blocks
((ServerPlayer) entityhuman).getBukkitEntity().updateInventory(); // SPIGOT-4541
return false;
}
diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index 9b4e20d4bfba2de08084f1d69cb2ebfff7455c14..06dc04a1fbb91a5a20d662aeee168b6a319551d0 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -458,10 +458,12 @@ public final class ItemStack {
world.preventPoiUpdated = false;
// Brute force all possible updates
- BlockPos placedPos = ((CraftBlock) placeEvent.getBlock()).getPosition();
- for (Direction dir : Direction.values()) {
- ((ServerPlayer) entityhuman).connection.send(new ClientboundBlockUpdatePacket(world, placedPos.relative(dir)));
- }
+ // Paper start - Don't resync blocks
+ // BlockPos placedPos = ((CraftBlock) placeEvent.getBlock()).getPosition();
+ // for (Direction dir : Direction.values()) {
+ // ((ServerPlayer) entityhuman).connection.send(new ClientboundBlockUpdatePacket(world, placedPos.relative(dir)));
+ // }
+ // Paper end - Don't resync blocks
SignItem.openSign = null; // SPIGOT-6758 - Reset on early return
} else {
// Change the stack to its new contents if it hasn't been tampered with.
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