forked from SteamWar/SteamWar
Update TinyProtocol
This commit is contained in:
@@ -19,14 +19,11 @@
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package com.comphenix.tinyprotocol;
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import com.google.common.collect.MapMaker;
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import com.mojang.authlib.GameProfile;
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import de.steamwar.Reflection;
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import de.steamwar.Reflection.Field;
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import de.steamwar.core.Core;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelDuplexHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPromise;
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import lombok.Getter;
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import io.netty.channel.*;
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import org.bukkit.Bukkit;
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import org.bukkit.entity.Player;
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import org.bukkit.event.EventHandler;
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@@ -34,190 +31,490 @@ import org.bukkit.event.EventPriority;
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import org.bukkit.event.HandlerList;
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import org.bukkit.event.Listener;
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import org.bukkit.event.player.PlayerLoginEvent;
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import org.bukkit.event.player.PlayerQuitEvent;
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import org.bukkit.event.server.PluginDisableEvent;
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import org.bukkit.plugin.Plugin;
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import org.bukkit.scheduler.BukkitRunnable;
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import java.util.*;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.function.BiFunction;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.logging.Level;
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public class TinyProtocol implements Listener {
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/**
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* Represents a very tiny alternative to ProtocolLib.
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* <p>
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* It now supports intercepting packets during login and status ping (such as OUT_SERVER_PING)!
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*
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* @author Kristian
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*/
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public abstract class TinyProtocol {
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private static final AtomicInteger ID = new AtomicInteger(0);
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private static final Class<?> craftServer = Reflection.getClass("org.bukkit.craftbukkit.CraftServer");
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private static final Class<?> dedicatedPlayerList = Reflection.getClass("net.minecraft.server.dedicated.DedicatedPlayerList");
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private static final Field<?> getPlayerList = Reflection.getField(craftServer, dedicatedPlayerList, 0);
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private static final Class<?> playerList = Reflection.getClass("net.minecraft.server.players.PlayerList");
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private static final Class<?> minecraftServer = Reflection.getClass("net.minecraft.server.MinecraftServer");
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private static final Field<?> getMinecraftServer = Reflection.getField(playerList, minecraftServer, 0);
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public static final Class<?> serverConnection = Reflection.getClass("net.minecraft.server.network.ServerConnectionListener");
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private static final Field<?> getServerConnection = Reflection.getField(minecraftServer, serverConnection, 0);
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public static Object getServerConnection(Plugin plugin) {
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return getServerConnection.get(getMinecraftServer.get(getPlayerList.get(plugin.getServer())));
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// Required Minecraft classes
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private static final Class<?> entityPlayerClass = Reflection.getClass("{nms}.EntityPlayer", "net.minecraft.server.level.EntityPlayer");
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private static final Class<?> playerConnectionClass = Reflection.getClass("{nms}.PlayerConnection", "net.minecraft.server.network.PlayerConnection");
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private static final Class<?> networkManagerClass = Reflection.getClass("{nms}.NetworkManager", "net.minecraft.network.NetworkManager");
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// Used in order to lookup a channel
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private static final MethodInvoker getPlayerHandle = Reflection.getMethod("{obc}.entity.CraftPlayer", "getHandle");
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private static final FieldAccessor<?> getConnection = Reflection.getField(entityPlayerClass, null, playerConnectionClass);
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private static final FieldAccessor<?> getManager = Reflection.getField(playerConnectionClass, null, networkManagerClass);
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private static final FieldAccessor<Channel> getChannel = Reflection.getField(networkManagerClass, Channel.class, 0);
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// Looking up ServerConnection
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private static final Class<Object> minecraftServerClass = Reflection.getUntypedClass("{nms}.MinecraftServer", "net.minecraft.server.MinecraftServer");
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private static final Class<Object> serverConnectionClass = Reflection.getUntypedClass("{nms}.ServerConnection", "net.minecraft.server.network.ServerConnection");
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private static final FieldAccessor<Object> getMinecraftServer = Reflection.getField("{obc}.CraftServer", minecraftServerClass, 0);
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private static final FieldAccessor<Object> getServerConnection = Reflection.getField(minecraftServerClass, serverConnectionClass, 0);
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// Packets we have to intercept
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private static final Class<?> PACKET_LOGIN_IN_START = Reflection.getClass("{nms}.PacketLoginInStart", "net.minecraft.network.protocol.login.PacketLoginInStart");
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private static final FieldAccessor<GameProfile> getGameProfile = Reflection.getField(PACKET_LOGIN_IN_START, GameProfile.class, 0);
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// Speedup channel lookup
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private Map<String, Channel> channelLookup = new MapMaker().weakValues().makeMap();
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private Listener listener;
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// Channels that have already been removed
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private Set<Channel> uninjectedChannels = Collections.newSetFromMap(new MapMaker().weakKeys().<Channel, Boolean>makeMap());
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// List of network markers
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private List<Object> networkManagers;
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// Injected channel handlers
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private List<Channel> serverChannels = new ArrayList<>();
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private ChannelInboundHandlerAdapter serverChannelHandler;
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private ChannelInitializer<Channel> beginInitProtocol;
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private ChannelInitializer<Channel> endInitProtocol;
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// Current handler name
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private String handlerName;
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protected volatile boolean closed;
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protected Plugin plugin;
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/**
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* Construct a new instance of TinyProtocol, and start intercepting packets for all connected clients and future clients.
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* <p>
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* You can construct multiple instances per plugin.
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*
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* @param plugin - the plugin.
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*/
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public TinyProtocol(final Plugin plugin) {
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this.plugin = plugin;
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// Compute handler name
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this.handlerName = getHandlerName();
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// Prepare existing players
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registerBukkitEvents();
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try {
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registerChannelHandler();
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registerPlayers(plugin);
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} catch (IllegalArgumentException ex) {
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// Damn you, late bind
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plugin.getLogger().info("[TinyProtocol] Delaying server channel injection due to late bind.");
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new BukkitRunnable() {
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@Override
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public void run() {
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registerChannelHandler();
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registerPlayers(plugin);
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plugin.getLogger().info("[TinyProtocol] Late bind injection successful.");
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}
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}.runTask(plugin);
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}
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private static final Class<?> networkManager = Reflection.getClass("net.minecraft.network.NetworkManager");
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public static final Field<List> networkManagers = Reflection.getField(serverConnection, List.class, 0, networkManager);
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private static final String HANDLER_NAME = "tiny-steamwar";
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public static final TinyProtocol instance = new TinyProtocol(Core.getInstance());
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public static void init() {
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//enforce init
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}
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private final Plugin plugin;
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private final List<?> connections;
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private boolean closed;
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private final Map<Class<?>, List<BiFunction<Player, Object, Object>>> packetFilters = new HashMap<>();
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@Getter
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private final Map<Player, PacketInterceptor> playerInterceptors = new HashMap<>();
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private void createServerChannelHandler() {
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// Handle connected channels
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endInitProtocol = new ChannelInitializer<Channel>() {
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@Override
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public String toString() {
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return "TinyProtocol{" +
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"plugin=" + plugin +
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", connections=" + connections +
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", closed=" + closed +
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", packetFilters=" + packetFilters +
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", playerInterceptors=" + playerInterceptors +
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'}';
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}
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private TinyProtocol(final Plugin plugin) {
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this.plugin = plugin;
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this.connections = networkManagers.get(getServerConnection(plugin));
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plugin.getServer().getPluginManager().registerEvents(this, plugin);
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for (Player player : plugin.getServer().getOnlinePlayers()) {
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new PacketInterceptor(player);
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protected void initChannel(Channel channel) throws Exception {
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try {
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// This can take a while, so we need to stop the main thread from interfering
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synchronized (networkManagers) {
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// Stop injecting channels
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if (!closed) {
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channel.eventLoop().submit(() -> injectChannelInternal(channel));
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}
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}
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} catch (Exception e) {
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plugin.getLogger().log(Level.SEVERE, "Cannot inject incomming channel " + channel, e);
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}
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}
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};
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// This is executed before Minecraft's channel handler
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beginInitProtocol = new ChannelInitializer<Channel>() {
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@Override
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protected void initChannel(Channel channel) throws Exception {
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channel.pipeline().addLast(endInitProtocol);
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}
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};
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serverChannelHandler = new ChannelInboundHandlerAdapter() {
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@Override
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public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
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Channel channel = (Channel) msg;
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// Prepare to initialize ths channel
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channel.pipeline().addFirst(beginInitProtocol);
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ctx.fireChannelRead(msg);
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}
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};
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}
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/**
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* Register bukkit events.
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*/
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private void registerBukkitEvents() {
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listener = new Listener() {
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@EventHandler(priority = EventPriority.LOWEST)
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public void onPlayerLogin(PlayerLoginEvent e) {
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plugin.getLogger().info("Creating PacketInterceptor for: " + e.getPlayer().getName() + " (" + closed + ")");
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public final void onPlayerLogin(PlayerLoginEvent e) {
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if (closed)
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return;
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new PacketInterceptor(e.getPlayer());
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}
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@EventHandler(priority = EventPriority.MONITOR)
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public void onPlayerDisconnect(PlayerQuitEvent e) {
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getInterceptor(e.getPlayer()).ifPresent(PacketInterceptor::close);
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Channel channel = getChannel(e.getPlayer());
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// Don't inject players that have been explicitly uninjected
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if (!uninjectedChannels.contains(channel)) {
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injectPlayer(e.getPlayer());
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}
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}
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@EventHandler
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public void onPluginDisable(PluginDisableEvent e) {
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public final void onPluginDisable(PluginDisableEvent e) {
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if (e.getPlugin().equals(plugin)) {
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close();
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}
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}
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public <T> void addTypedFilter(Class<T> packetType, BiFunction<Player, T, Object> filter) {
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packetFilters.computeIfAbsent(packetType, c -> new CopyOnWriteArrayList<>()).add((BiFunction) filter);
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};
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plugin.getServer().getPluginManager().registerEvents(listener, plugin);
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}
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public void addFilter(Class<?> packetType, BiFunction<Player, Object, Object> filter) {
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packetFilters.computeIfAbsent(packetType, c -> new CopyOnWriteArrayList<>()).add(filter);
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}
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public void removeFilter(Class<?> packetType, BiFunction<Player, Object, Object> filter) {
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packetFilters.getOrDefault(packetType, Collections.emptyList()).remove(filter);
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}
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public void sendPacket(Player player, Object packet) {
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getInterceptor(player).ifPresent(i -> i.sendPacket(packet));
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}
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public void receivePacket(Player player, Object packet) {
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getInterceptor(player).ifPresent(i -> i.receivePacket(packet));
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}
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public final void close() {
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plugin.getLogger().log(Level.INFO, "Closing PacketInterceptor", new Exception("Stacktrace"));
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if(closed)
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return;
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closed = true;
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HandlerList.unregisterAll(this);
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for (Player player : plugin.getServer().getOnlinePlayers()) {
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getInterceptor(player).ifPresent(PacketInterceptor::close);
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}
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}
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private Optional<PacketInterceptor> getInterceptor(Player player) {
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synchronized (playerInterceptors) {
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return Optional.ofNullable(playerInterceptors.get(player));
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}
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}
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private static final Field<Channel> getChannel = Reflection.getField(networkManager, Channel.class, 0);
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private static final Field<UUID> getUUID = Reflection.getField(networkManager, UUID.class, 0);
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public final class PacketInterceptor extends ChannelDuplexHandler {
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private final Player player;
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@Getter
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private final Channel channel;
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private PacketInterceptor(Player player) {
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this.player = player;
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channel = connections.stream().filter(connection -> player.getUniqueId().equals(getUUID.get(connection))).map(getChannel::get).filter(Channel::isActive).findAny().orElseThrow(() -> {
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Bukkit.getScheduler().runTask(plugin, () -> player.kickPlayer("Connection failure."));
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return new SecurityException("Could not find channel for player " + player.getName());
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});
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if(!channel.isActive())
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return;
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synchronized (playerInterceptors) {
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playerInterceptors.put(player, this);
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}
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plugin.getLogger().info("Adding Techhider for: " + player.getName());
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@SuppressWarnings("unchecked")
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private void registerChannelHandler() {
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Object mcServer = getMinecraftServer.get(Bukkit.getServer());
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Object serverConnection = getServerConnection.get(mcServer);
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boolean looking = true;
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try {
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channel.pipeline().addBefore("packet_handler", HANDLER_NAME, this);
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} catch (IllegalArgumentException | NoSuchElementException e) {
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Bukkit.getScheduler().runTask(plugin, () -> player.kickPlayer("Connection failure."));
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throw new SecurityException(e);
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Field field = Reflection.getParameterizedField(serverConnectionClass, List.class, networkManagerClass);
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field.setAccessible(true);
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networkManagers = (List<Object>) field.get(serverConnection);
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} catch (Exception ex) {
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plugin.getLogger().info("Encountered an exception checking list fields" + ex);
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MethodInvoker method = Reflection.getTypedMethod(serverConnectionClass, null, List.class, serverConnectionClass);
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networkManagers = (List<Object>) method.invoke(null, serverConnection);
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}
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if (networkManagers == null) {
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throw new IllegalArgumentException("Failed to obtain list of network managers");
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}
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// We need to synchronize against this list
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createServerChannelHandler();
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// Find the correct list, or implicitly throw an exception
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for (int i = 0; looking; i++) {
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List<Object> list = Reflection.getField(serverConnection.getClass(), List.class, i).get(serverConnection);
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for (Object item : list) {
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if (!ChannelFuture.class.isInstance(item))
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break;
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// Channel future that contains the server connection
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Channel serverChannel = ((ChannelFuture) item).channel();
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serverChannels.add(serverChannel);
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serverChannel.pipeline().addFirst(serverChannelHandler);
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looking = false;
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}
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}
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}
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private void sendPacket(Object packet) {
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private void unregisterChannelHandler() {
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if (serverChannelHandler == null)
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return;
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for (Channel serverChannel : serverChannels) {
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final ChannelPipeline pipeline = serverChannel.pipeline();
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// Remove channel handler
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serverChannel.eventLoop().execute(new Runnable() {
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@Override
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public void run() {
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try {
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pipeline.remove(serverChannelHandler);
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} catch (NoSuchElementException e) {
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// That's fine
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}
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}
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});
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}
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}
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private void registerPlayers(Plugin plugin) {
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for (Player player : plugin.getServer().getOnlinePlayers()) {
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injectPlayer(player);
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}
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}
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/**
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* Invoked when the server is starting to send a packet to a player.
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* <p>
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* Note that this is not executed on the main thread.
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*
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* @param receiver - the receiving player, NULL for early login/status packets.
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* @param channel - the channel that received the packet. Never NULL.
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* @param packet - the packet being sent.
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* @return The packet to send instead, or NULL to cancel the transmission.
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*/
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public Object onPacketOutAsync(Player receiver, Channel channel, Object packet) {
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return packet;
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}
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/**
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* Invoked when the server has received a packet from a given player.
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* <p>
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* Use {@link Channel#remoteAddress()} to get the remote address of the client.
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*
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* @param sender - the player that sent the packet, NULL for early login/status packets.
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* @param channel - channel that received the packet. Never NULL.
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* @param packet - the packet being received.
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* @return The packet to recieve instead, or NULL to cancel.
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*/
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public Object onPacketInAsync(Player sender, Channel channel, Object packet) {
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return packet;
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}
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/**
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* Send a packet to a particular player.
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* <p>
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||||
* Note that {@link #onPacketOutAsync(Player, Channel, Object)} will be invoked with this packet.
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*
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* @param player - the destination player.
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* @param packet - the packet to send.
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*/
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public void sendPacket(Player player, Object packet) {
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sendPacket(getChannel(player), packet);
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}
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/**
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* Send a packet to a particular client.
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* <p>
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* Note that {@link #onPacketOutAsync(Player, Channel, Object)} will be invoked with this packet.
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*
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* @param channel - client identified by a channel.
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* @param packet - the packet to send.
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*/
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public void sendPacket(Channel channel, Object packet) {
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channel.pipeline().writeAndFlush(packet);
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}
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private void receivePacket(Object packet) {
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/**
|
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* Pretend that a given packet has been received from a player.
|
||||
* <p>
|
||||
* Note that {@link #onPacketInAsync(Player, Channel, Object)} will be invoked with this packet.
|
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*
|
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* @param player - the player that sent the packet.
|
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* @param packet - the packet that will be received by the server.
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*/
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public void receivePacket(Player player, Object packet) {
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receivePacket(getChannel(player), packet);
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}
|
||||
|
||||
/**
|
||||
* Pretend that a given packet has been received from a given client.
|
||||
* <p>
|
||||
* Note that {@link #onPacketInAsync(Player, Channel, Object)} will be invoked with this packet.
|
||||
*
|
||||
* @param channel - client identified by a channel.
|
||||
* @param packet - the packet that will be received by the server.
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||||
*/
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||||
public void receivePacket(Channel channel, Object packet) {
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channel.pipeline().context("encoder").fireChannelRead(packet);
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}
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||||
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||||
private void close() {
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||||
if(channel.isActive()) {
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||||
channel.eventLoop().execute(() -> {
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||||
try {
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||||
channel.pipeline().remove(HANDLER_NAME);
|
||||
} catch (NoSuchElementException e) {
|
||||
// ignore
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||||
/**
|
||||
* Retrieve the name of the channel injector, default implementation is "tiny-" + plugin name + "-" + a unique ID.
|
||||
* <p>
|
||||
* Note that this method will only be invoked once. It is no longer necessary to override this to support multiple instances.
|
||||
*
|
||||
* @return A unique channel handler name.
|
||||
*/
|
||||
protected String getHandlerName() {
|
||||
return "tiny-" + plugin.getName() + "-" + ID.incrementAndGet();
|
||||
}
|
||||
|
||||
/**
|
||||
* Add a custom channel handler to the given player's channel pipeline, allowing us to intercept sent and received packets.
|
||||
* <p>
|
||||
* This will automatically be called when a player has logged in.
|
||||
*
|
||||
* @param player - the player to inject.
|
||||
*/
|
||||
public void injectPlayer(Player player) {
|
||||
injectChannelInternal(getChannel(player)).player = player;
|
||||
}
|
||||
|
||||
/**
|
||||
* Add a custom channel handler to the given channel.
|
||||
*
|
||||
* @param channel - the channel to inject.
|
||||
* @return The intercepted channel, or NULL if it has already been injected.
|
||||
*/
|
||||
public void injectChannel(Channel channel) {
|
||||
injectChannelInternal(channel);
|
||||
}
|
||||
|
||||
/**
|
||||
* Add a custom channel handler to the given channel.
|
||||
*
|
||||
* @param channel - the channel to inject.
|
||||
* @return The packet interceptor.
|
||||
*/
|
||||
private PacketInterceptor injectChannelInternal(Channel channel) {
|
||||
try {
|
||||
PacketInterceptor interceptor = (PacketInterceptor) channel.pipeline().get(handlerName);
|
||||
|
||||
// Inject our packet interceptor
|
||||
if (interceptor == null) {
|
||||
interceptor = new PacketInterceptor();
|
||||
channel.pipeline().addBefore("packet_handler", handlerName, interceptor);
|
||||
uninjectedChannels.remove(channel);
|
||||
}
|
||||
|
||||
return interceptor;
|
||||
} catch (IllegalArgumentException e) {
|
||||
// Try again
|
||||
return (PacketInterceptor) channel.pipeline().get(handlerName);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Retrieve the Netty channel associated with a player. This is cached.
|
||||
*
|
||||
* @param player - the player.
|
||||
* @return The Netty channel.
|
||||
*/
|
||||
public Channel getChannel(Player player) {
|
||||
Channel channel = channelLookup.get(player.getName());
|
||||
|
||||
// Lookup channel again
|
||||
if (channel == null) {
|
||||
Object connection = getConnection.get(getPlayerHandle.invoke(player));
|
||||
Object manager = getManager.get(connection);
|
||||
|
||||
channelLookup.put(player.getName(), channel = getChannel.get(manager));
|
||||
}
|
||||
|
||||
return channel;
|
||||
}
|
||||
|
||||
/**
|
||||
* Uninject a specific player.
|
||||
*
|
||||
* @param player - the injected player.
|
||||
*/
|
||||
public void uninjectPlayer(Player player) {
|
||||
uninjectChannel(getChannel(player));
|
||||
}
|
||||
|
||||
/**
|
||||
* Uninject a specific channel.
|
||||
* <p>
|
||||
* This will also disable the automatic channel injection that occurs when a player has properly logged in.
|
||||
*
|
||||
* @param channel - the injected channel.
|
||||
*/
|
||||
public void uninjectChannel(final Channel channel) {
|
||||
// No need to guard against this if we're closing
|
||||
if (!closed) {
|
||||
uninjectedChannels.add(channel);
|
||||
}
|
||||
|
||||
// See ChannelInjector in ProtocolLib, line 590
|
||||
channel.eventLoop().execute(new Runnable() {
|
||||
|
||||
@Override
|
||||
public void run() {
|
||||
channel.pipeline().remove(handlerName);
|
||||
}
|
||||
|
||||
});
|
||||
}
|
||||
|
||||
synchronized (playerInterceptors) {
|
||||
playerInterceptors.remove(player, this);
|
||||
/**
|
||||
* Determine if the given player has been injected by TinyProtocol.
|
||||
*
|
||||
* @param player - the player.
|
||||
* @return TRUE if it is, FALSE otherwise.
|
||||
*/
|
||||
public boolean hasInjected(Player player) {
|
||||
return hasInjected(getChannel(player));
|
||||
}
|
||||
|
||||
/**
|
||||
* Determine if the given channel has been injected by TinyProtocol.
|
||||
*
|
||||
* @param channel - the channel.
|
||||
* @return TRUE if it is, FALSE otherwise.
|
||||
*/
|
||||
public boolean hasInjected(Channel channel) {
|
||||
return channel.pipeline().get(handlerName) != null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Cease listening for packets. This is called automatically when your plugin is disabled.
|
||||
*/
|
||||
public final void close() {
|
||||
if (!closed) {
|
||||
closed = true;
|
||||
|
||||
// Remove our handlers
|
||||
for (Player player : plugin.getServer().getOnlinePlayers()) {
|
||||
uninjectPlayer(player);
|
||||
}
|
||||
|
||||
// Clean up Bukkit
|
||||
HandlerList.unregisterAll(listener);
|
||||
unregisterChannelHandler();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Channel handler that is inserted into the player's channel pipeline, allowing us to intercept sent and received packets.
|
||||
*
|
||||
* @author Kristian
|
||||
*/
|
||||
private final class PacketInterceptor extends ChannelDuplexHandler {
|
||||
// Updated by the login event
|
||||
public volatile Player player;
|
||||
|
||||
@Override
|
||||
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
|
||||
// Intercept channel
|
||||
final Channel channel = ctx.channel();
|
||||
handleLoginStart(channel, msg);
|
||||
|
||||
try {
|
||||
msg = filterPacket(player, msg);
|
||||
msg = onPacketInAsync(player, channel, msg);
|
||||
} catch (Exception e) {
|
||||
plugin.getLogger().log(Level.SEVERE, "Error during incoming packet processing", e);
|
||||
plugin.getLogger().log(Level.SEVERE, "Error in onPacketInAsync().", e);
|
||||
}
|
||||
|
||||
if (msg != null) {
|
||||
@@ -228,9 +525,9 @@ public class TinyProtocol implements Listener {
|
||||
@Override
|
||||
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
|
||||
try {
|
||||
msg = filterPacket(player, msg);
|
||||
msg = onPacketOutAsync(player, ctx.channel(), msg);
|
||||
} catch (Exception e) {
|
||||
plugin.getLogger().log(Level.SEVERE, "Error during outgoing packet processing", e);
|
||||
plugin.getLogger().log(Level.SEVERE, "Error in onPacketOutAsync().", e);
|
||||
}
|
||||
|
||||
if (msg != null) {
|
||||
@@ -238,17 +535,11 @@ public class TinyProtocol implements Listener {
|
||||
}
|
||||
}
|
||||
|
||||
private Object filterPacket(Player player, Object packet) {
|
||||
List<BiFunction<Player, Object, Object>> filters = packetFilters.getOrDefault(packet.getClass(), Collections.emptyList());
|
||||
|
||||
for(BiFunction<Player, Object, Object> filter : filters) {
|
||||
packet = filter.apply(player, packet);
|
||||
|
||||
if(packet == null)
|
||||
break;
|
||||
}
|
||||
|
||||
return packet;
|
||||
private void handleLoginStart(Channel channel, Object packet) {
|
||||
if (PACKET_LOGIN_IN_START.isInstance(packet)) {
|
||||
GameProfile profile = getGameProfile.get(packet);
|
||||
channelLookup.put(profile.getName(), channel);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user