88 lines
4.6 KiB
Java
88 lines
4.6 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2024 ViaVersion and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.viaversion.viaversion.bukkit.compat;
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import com.viaversion.viaversion.api.Via;
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import com.viaversion.viaversion.bukkit.util.NMSUtil;
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import java.lang.reflect.Method;
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import protocolsupport.api.Connection;
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final class ProtocolSupportConnectionListener extends Connection.PacketListener {
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static final Method ADD_PACKET_LISTENER_METHOD;
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private static final Class<?> HANDSHAKE_PACKET_CLASS;
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private static final Method GET_VERSION_METHOD;
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private static final Method SET_VERSION_METHOD;
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private static final Method REMOVE_PACKET_LISTENER_METHOD;
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private static final Method GET_LATEST_METHOD;
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private static final Object PROTOCOL_VERSION_MINECRAFT_FUTURE;
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private static final Object PROTOCOL_TYPE_PC;
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static {
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try {
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HANDSHAKE_PACKET_CLASS = NMSUtil.nms(
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"PacketHandshakingInSetProtocol",
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"net.minecraft.network.protocol.handshake.PacketHandshakingInSetProtocol"
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);
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final Class<?> connectionImplClass = Class.forName("protocolsupport.protocol.ConnectionImpl");
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final Class<?> connectionClass = Class.forName("protocolsupport.api.Connection");
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final Class<?> packetListenerClass = Class.forName("protocolsupport.api.Connection$PacketListener");
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final Class<?> protocolVersionClass = Class.forName("protocolsupport.api.ProtocolVersion");
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final Class<?> protocolTypeClass = Class.forName("protocolsupport.api.ProtocolType");
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GET_VERSION_METHOD = connectionClass.getDeclaredMethod("getVersion");
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SET_VERSION_METHOD = connectionImplClass.getDeclaredMethod("setVersion", protocolVersionClass);
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PROTOCOL_VERSION_MINECRAFT_FUTURE = protocolVersionClass.getDeclaredField("MINECRAFT_FUTURE").get(null);
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GET_LATEST_METHOD = protocolVersionClass.getDeclaredMethod("getLatest", protocolTypeClass);
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PROTOCOL_TYPE_PC = protocolTypeClass.getDeclaredField("PC").get(null);
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ADD_PACKET_LISTENER_METHOD = connectionClass.getDeclaredMethod("addPacketListener", packetListenerClass);
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REMOVE_PACKET_LISTENER_METHOD = connectionClass.getDeclaredMethod("removePacketListener", packetListenerClass);
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} catch (final ReflectiveOperationException e) {
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throw new RuntimeException(e);
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}
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}
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private final Object connection;
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ProtocolSupportConnectionListener(final Object connection) {
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this.connection = connection;
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}
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@Override
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public void onPacketReceiving(final Connection.PacketListener.PacketEvent event) {
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try {
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// Check if we are getting handshake packet.
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if (HANDSHAKE_PACKET_CLASS.isInstance(event.getPacket()) && GET_VERSION_METHOD.invoke(connection) == PROTOCOL_VERSION_MINECRAFT_FUTURE) {
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final Object packet = event.getPacket();
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final int protocolVersion = (int) HANDSHAKE_PACKET_CLASS.getDeclaredMethod(ProtocolSupportCompat.handshakeVersionMethod().methodName()).invoke(packet);
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// ViaVersion has at this point already spoofed the connectionversion. (Since it is higher up the pipeline)
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// If via has put the protoVersion to the server we can spoof ProtocolSupport's version.
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if (protocolVersion == Via.getAPI().getServerVersion().lowestSupportedVersion()) {
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SET_VERSION_METHOD.invoke(connection, GET_LATEST_METHOD.invoke(null, PROTOCOL_TYPE_PC));
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}
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}
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// Id version is not serverversion viaversion will not spoof. ProtocolSupport will handle the rest.
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// In any case, remove the packet listener and wrap up.
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REMOVE_PACKET_LISTENER_METHOD.invoke(connection, this);
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} catch (final ReflectiveOperationException e) {
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throw new RuntimeException(e);
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}
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}
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}
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