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62 changes: 62 additions & 0 deletions
62
.../java/com/velocitypowered/proxy/protocol/packet/uuidrewrite/EntityPacketUuidRewriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| /* | ||
| * Copyright (C) 2024 Velocity Contributors | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
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| package com.velocitypowered.proxy.protocol.packet.uuidrewrite; | ||
|
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| import com.velocitypowered.api.proxy.Player; | ||
| import com.velocitypowered.proxy.VelocityServer; | ||
| import com.velocitypowered.proxy.config.PlayerInfoForwarding; | ||
|
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| import java.util.UUID; | ||
| import java.util.function.Function; | ||
|
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| public class EntityPacketUuidRewriter { | ||
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| public static void rewriteS2C(VelocityServer server, Player connectionPlayer, PacketToRewriteEntityUuid packet) { | ||
| rewrite(server, connectionPlayer, packet, Player::getOfflineUuid, Player::getUniqueId); | ||
| } | ||
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| public static void rewriteC2S(VelocityServer server, Player connectionPlayer, PacketToRewriteEntityUuid packet) { | ||
| rewrite(server, connectionPlayer, packet, Player::getUniqueId, Player::getOfflineUuid); | ||
| } | ||
|
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| private static void rewrite(VelocityServer server, Player connectionPlayer, PacketToRewriteEntityUuid packet, | ||
| Function<Player, UUID> uuidFrom, Function<Player, UUID> uuidTo) { | ||
| var config = server.getConfiguration(); | ||
| if (!(config.isOnlineMode() && config.getPlayerInfoForwardingMode() == PlayerInfoForwarding.NONE)) { | ||
| return; | ||
| } | ||
| if (!packet.isPlayer()) { | ||
| return; | ||
| } | ||
| UUID uuid = packet.getEntityUuid(); | ||
| if (uuid == null) { | ||
| return; | ||
| } | ||
|
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| // FIXME: inefficient implementation using for loop. Replace it with map lookup? | ||
| for (Player player : server.getAllPlayers()) { | ||
| if (uuidFrom.apply(player).equals(uuid)) { | ||
| UUID newUuid = uuidTo.apply(player); | ||
| if (!newUuid.equals(uuid)) { | ||
| packet.setEntityUuid(newUuid); | ||
| } | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| } |
29 changes: 29 additions & 0 deletions
29
...java/com/velocitypowered/proxy/protocol/packet/uuidrewrite/PacketToRewriteEntityUuid.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| /* | ||
| * Copyright (C) 2024 Velocity Contributors | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
|
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| package com.velocitypowered.proxy.protocol.packet.uuidrewrite; | ||
|
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| import java.util.UUID; | ||
|
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| public interface PacketToRewriteEntityUuid { | ||
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| boolean isPlayer(); | ||
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| UUID getEntityUuid(); | ||
|
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| void setEntityUuid(UUID entityUuid); | ||
| } |
74 changes: 74 additions & 0 deletions
74
...in/java/com/velocitypowered/proxy/protocol/packet/uuidrewrite/UrSpawnEntityS2CPacket.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| /* | ||
| * Copyright (C) 2024 Velocity Contributors | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
|
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| package com.velocitypowered.proxy.protocol.packet.uuidrewrite; | ||
|
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| import com.velocitypowered.api.network.ProtocolVersion; | ||
| import com.velocitypowered.proxy.connection.MinecraftSessionHandler; | ||
| import com.velocitypowered.proxy.protocol.MinecraftPacket; | ||
| import com.velocitypowered.proxy.protocol.ProtocolUtils; | ||
| import io.netty.buffer.ByteBuf; | ||
|
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| import java.util.UUID; | ||
|
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| // [fallen's fork] player uuid rewrite - entity packet | ||
| public class UrSpawnEntityS2CPacket implements MinecraftPacket, PacketToRewriteEntityUuid { | ||
|
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| private int entityId; | ||
| private UUID entityUuid; | ||
| private int entityType; | ||
| private byte[] remainingBuf; | ||
|
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| @Override | ||
| public void decode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion protocolVersion) { | ||
| this.entityId = ProtocolUtils.readVarInt(buf); | ||
| this.entityUuid = ProtocolUtils.readUuid(buf); | ||
| this.entityType = ProtocolUtils.readVarInt(buf); | ||
| this.remainingBuf = new byte[buf.readableBytes()]; | ||
| buf.readBytes(this.remainingBuf); | ||
| } | ||
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| @Override | ||
| public void encode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion protocolVersion) { | ||
| ProtocolUtils.writeVarInt(buf, this.entityId); | ||
| ProtocolUtils.writeUuid(buf, this.entityUuid); | ||
| ProtocolUtils.writeVarInt(buf, this.entityType); | ||
| buf.writeBytes(this.remainingBuf); | ||
| } | ||
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| @Override | ||
| public boolean handle(MinecraftSessionHandler handler) { | ||
| return handler.handle(this); | ||
| } | ||
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| @Override | ||
| public boolean isPlayer() { | ||
| // https://wiki.vg/Entity_metadata#Mobs | ||
| int playerEntityType = 122; // mc1.20.2 | ||
| return this.entityType == playerEntityType; | ||
| } | ||
|
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| @Override | ||
| public UUID getEntityUuid() { | ||
| return this.entityUuid; | ||
| } | ||
|
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| @Override | ||
| public void setEntityUuid(UUID entityUuid) { | ||
| this.entityUuid = entityUuid; | ||
| } | ||
| } |
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