Scissors/patches/server/0029-Block-server-side-chunkbans.patch
2023-04-08 13:10:07 -06:00

205 lines
11 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: ayunami2000 <spwilliamsiam@gmail.com>
Date: Fri, 17 Jun 2022 15:28:43 -0500
Subject: [PATCH] Block server side chunkbans
diff --git a/src/main/java/net/minecraft/network/PacketEncoder.java b/src/main/java/net/minecraft/network/PacketEncoder.java
index ebee957fb048da6ffcd2a5ba2ed989ed1a6634e9..889342fac2903f16846e9303631a64df6fcfc589 100644
--- a/src/main/java/net/minecraft/network/PacketEncoder.java
+++ b/src/main/java/net/minecraft/network/PacketEncoder.java
@@ -6,9 +6,26 @@ import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import io.papermc.paper.adventure.PaperAdventure; // Paper
import java.io.IOException;
+import java.util.Collections;
+import net.minecraft.ChatFormatting;
+import net.minecraft.core.NonNullList;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.SignedMessageBody;
import net.minecraft.network.protocol.Packet;
import net.minecraft.network.protocol.PacketFlow;
+import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
+import net.minecraft.network.protocol.game.ClientboundContainerSetContentPacket;
+import net.minecraft.network.protocol.game.ClientboundContainerSetSlotPacket;
+import net.minecraft.network.protocol.game.ClientboundDisguisedChatPacket;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkPacketData;
+import net.minecraft.network.protocol.game.ClientboundMapItemDataPacket;
+import net.minecraft.network.protocol.game.ClientboundPlayerChatPacket;
+import net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket;
+import net.minecraft.network.protocol.game.ClientboundSetEquipmentPacket;
+import net.minecraft.network.protocol.game.ClientboundSystemChatPacket;
import net.minecraft.util.profiling.jfr.JvmProfiler;
+import net.minecraft.world.item.ItemStack;
import org.slf4j.Logger;
public class PacketEncoder extends MessageToByteEncoder<Packet<?>> {
@@ -19,6 +36,23 @@ public class PacketEncoder extends MessageToByteEncoder<Packet<?>> {
this.flow = side;
}
+ // Scissors start
+ private static int tryWrite(Packet packet, FriendlyByteBuf friendlyByteBuf, ChannelHandlerContext channelHandlerContext, int i) {
+ friendlyByteBuf.writeVarInt(i);
+ friendlyByteBuf.adventure$locale = channelHandlerContext.channel().attr(PaperAdventure.LOCALE_ATTRIBUTE).get();
+
+ int j = friendlyByteBuf.writerIndex();
+ packet.write(friendlyByteBuf);
+ int k = friendlyByteBuf.writerIndex() - j;
+ int packetLength = friendlyByteBuf.readableBytes();
+ if (k > 8388608 || packetLength > MAX_PACKET_SIZE) {
+ throw new SkipPacketException(new IllegalArgumentException("Packet too big (is " + k + "): " + packet));
+ }
+
+ return k;
+ }
+ // Scissors end
+
protected void encode(ChannelHandlerContext channelHandlerContext, Packet<?> packet, ByteBuf byteBuf) throws Exception {
ConnectionProtocol connectionProtocol = channelHandlerContext.channel().attr(Connection.ATTRIBUTE_PROTOCOL).get();
if (connectionProtocol == null) {
@@ -33,38 +67,87 @@ public class PacketEncoder extends MessageToByteEncoder<Packet<?>> {
throw new IOException("Can't serialize unregistered packet");
} else {
FriendlyByteBuf friendlyByteBuf = new FriendlyByteBuf(byteBuf);
- friendlyByteBuf.writeVarInt(i);
- friendlyByteBuf.adventure$locale = channelHandlerContext.channel().attr(PaperAdventure.LOCALE_ATTRIBUTE).get(); // Paper
-
+ // Scissors start
+ int k;
try {
- int j = friendlyByteBuf.writerIndex();
- packet.write(friendlyByteBuf);
- int k = friendlyByteBuf.writerIndex() - j;
- if (k > 8388608) {
- throw new IllegalArgumentException("Packet too big (is " + k + ", should be less than 8388608): " + packet);
- } else {
- int l = channelHandlerContext.channel().attr(Connection.ATTRIBUTE_PROTOCOL).get().getId();
- JvmProfiler.INSTANCE.onPacketSent(l, i, channelHandlerContext.channel().remoteAddress(), k);
- }
+ k = tryWrite(packet, friendlyByteBuf, channelHandlerContext, i);
} catch (Throwable var10) {
- LOGGER.error("Packet encoding of packet ID {} threw (skippable? {})", i, packet.isSkippable(), var10); // Paper - Give proper error message
- if (packet.isSkippable()) {
- throw new SkipPacketException(var10);
- } else {
- throw var10;
+ packet = capPacket(packet, i);
+ if (packet == null) {
+ throw new SkipPacketException(new IllegalArgumentException("Packet too big: " + packet));
}
+ friendlyByteBuf.clear();
+ k = tryWrite(packet, friendlyByteBuf, channelHandlerContext, i);
}
- // Paper start
- int packetLength = friendlyByteBuf.readableBytes();
- if (packetLength > MAX_PACKET_SIZE) {
- throw new PacketTooLargeException(packet, packetLength);
- }
- // Paper end
+ int l = channelHandlerContext.channel().attr(Connection.ATTRIBUTE_PROTOCOL).get().getId();
+ JvmProfiler.INSTANCE.onPacketSent(l, i, channelHandlerContext.channel().remoteAddress(), k);
+ // Scissors end
}
}
}
+ // Scissors start
+ private static Packet capPacket(Packet packet, int i)
+ {
+ if (packet instanceof ClientboundBlockEntityDataPacket blockEntityDataPacket)
+ {
+ packet = new ClientboundBlockEntityDataPacket(blockEntityDataPacket.getPos(), blockEntityDataPacket.getType(), new CompoundTag());
+ }
+ else if (packet instanceof ClientboundLevelChunkPacketData chunkPacket)
+ {
+ chunkPacket.clearNBT();
+ }
+ else if (packet instanceof ClientboundSetEntityDataPacket)
+ {
+ return null; // Skip
+ }
+ else if (packet instanceof ClientboundContainerSetContentPacket containerSetContentPacket)
+ {
+ packet = new ClientboundContainerSetContentPacket(containerSetContentPacket.getContainerId(), containerSetContentPacket.getStateId(), NonNullList.create(), ItemStack.EMPTY);
+ }
+ else if (packet instanceof ClientboundSetEquipmentPacket setEquipmentPacket)
+ {
+ packet = new ClientboundSetEquipmentPacket(setEquipmentPacket.getEntity(), Collections.emptyList());
+ }
+ else if (packet instanceof ClientboundContainerSetSlotPacket containerSetSlotPacket)
+ {
+ packet = new ClientboundContainerSetSlotPacket(containerSetSlotPacket.getContainerId(), containerSetSlotPacket.getStateId(), containerSetSlotPacket.getSlot(), ItemStack.EMPTY);
+ }
+ else if (packet instanceof ClientboundMapItemDataPacket mapItemDataPacket)
+ {
+ packet = new ClientboundMapItemDataPacket(mapItemDataPacket.getMapId(), mapItemDataPacket.getScale(), mapItemDataPacket.isLocked(), null, null);
+ }
+ else if (packet instanceof ClientboundSystemChatPacket)
+ {
+ return null;
+ }
+ else if (packet instanceof ClientboundDisguisedChatPacket)
+ {
+ return null;
+ }
+ else if (packet instanceof ClientboundPlayerChatPacket playerChatPacket)
+ {
+ final SignedMessageBody.Packed body = playerChatPacket.body();
+ packet = new ClientboundPlayerChatPacket(playerChatPacket.sender(), // Not sending this packet results in a kick when someone says something.
+ playerChatPacket.index(),
+ playerChatPacket.signature(),
+ playerChatPacket.body(),
+ Component.empty().append("** Message too large **").withStyle(ChatFormatting.RED),
+ playerChatPacket.filterMask(),
+ playerChatPacket.chatType()
+ );
+ }
+ else
+ {
+ LOGGER.error("Packet with ID {} was too large and was not caught. Please report this to the Scissors developers.", i);
+ return null;
+ }
+
+ return packet;
+ }
+ // Scissors end
+
// Paper start
private static int MAX_PACKET_SIZE = 2097152;
diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundBlockEntityDataPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundBlockEntityDataPacket.java
index 3944852921335c78a04a9dc301882ab5b152b1ed..96ee53c7cc862e059328c5cdf5e07f309df6a79e 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundBlockEntityDataPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundBlockEntityDataPacket.java
@@ -24,7 +24,7 @@ public class ClientboundBlockEntityDataPacket implements Packet<ClientGamePacket
return create(blockEntity, BlockEntity::getUpdateTag);
}
- private ClientboundBlockEntityDataPacket(BlockPos pos, BlockEntityType<?> blockEntityType, CompoundTag nbt) {
+ public ClientboundBlockEntityDataPacket(BlockPos pos, BlockEntityType<?> blockEntityType, CompoundTag nbt) { // Scissors - private -> public
this.pos = pos;
this.type = blockEntityType;
this.tag = nbt.isEmpty() ? null : nbt;
diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacketData.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacketData.java
index f3fa2678796c33f3a408a02a1995ad117eac9169..c8dd976240aa4f640bb2d223d472f81fdd8dcf7c 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacketData.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacketData.java
@@ -33,6 +33,14 @@ public class ClientboundLevelChunkPacketData {
}
// Paper end
+ // Scissors start
+ public void clearNBT()
+ {
+ this.blockEntitiesData.clear();
+ this.extraPackets.clear();
+ }
+ // Scissors end
+
// Paper start - Anti-Xray - Add chunk packet info
@Deprecated @io.papermc.paper.annotation.DoNotUse public ClientboundLevelChunkPacketData(LevelChunk chunk) { this(chunk, null); }
public ClientboundLevelChunkPacketData(LevelChunk chunk, com.destroystokyo.paper.antixray.ChunkPacketInfo<net.minecraft.world.level.block.state.BlockState> chunkPacketInfo) {