mirror of
https://github.com/dmulloy2/ProtocolLib.git
synced 2024-11-24 11:36:51 +01:00
Permit cross edges when validating dependencies. FIXES 91.
This commit is contained in:
Kristian S. Stangeland
parent
6af440789c
commit
02b5dec304
@ -83,7 +83,7 @@ class PluginVerifier {
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* @throws PluginNotFoundException If a plugin with the given name cannot be found.
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*/
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private Plugin getPlugin(String pluginName) {
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Plugin plugin = Bukkit.getPluginManager().getPlugin(pluginName);
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Plugin plugin = getPluginOrDefault(pluginName);
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// Ensure that the plugin exists
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if (plugin != null)
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@ -92,6 +92,15 @@ class PluginVerifier {
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throw new PluginNotFoundException("Cannot find plugin " + pluginName);
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}
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/**
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* Retrieve a plugin by name.
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* @param pluginName - the non-null name of the plugin to retrieve.
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* @return The retrieved plugin, or NULL if not found.
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*/
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private Plugin getPluginOrDefault(String pluginName) {
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return Bukkit.getPluginManager().getPlugin(pluginName);
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}
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/**
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* Performs simple verifications on the given plugin.
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* <p>
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@ -183,15 +192,15 @@ class PluginVerifier {
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return Sets.newHashSet(list);
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}
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// Avoid cycles
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private boolean hasDependency(Plugin plugin, Plugin dependency, Set<String> checked) {
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// Avoid cycles. DFS.
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private boolean hasDependency(Plugin plugin, Plugin dependency, Set<String> checking) {
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Set<String> childNames = Sets.union(
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safeConversion(plugin.getDescription().getDepend()),
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safeConversion(plugin.getDescription().getSoftDepend())
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);
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// Ensure that the same plugin isn't processed twice
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if (!checked.add(plugin.getName())) {
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if (!checking.add(plugin.getName())) {
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throw new IllegalStateException("Cycle detected in dependency graph: " + plugin);
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}
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// Look for the dependency in the immediate children
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@ -201,13 +210,16 @@ class PluginVerifier {
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// Recurse through their dependencies
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for (String childName : childNames) {
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Plugin childPlugin = getPlugin(childName);
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Plugin childPlugin = getPluginOrDefault(childName);
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if (hasDependency(childPlugin, dependency, checked)) {
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if (childPlugin != null && hasDependency(childPlugin, dependency, checking)) {
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return true;
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}
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}
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// Cross edges are permitted
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checking.remove(plugin.getName());
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// No dependency found!
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return false;
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}
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@ -1,194 +1,193 @@
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/*
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* ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
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* Copyright (C) 2012 Kristian S. Stangeland
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 2 of
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* the License, or (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, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along with this program;
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* if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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package com.comphenix.protocol.injector.player;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.Set;
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import java.util.concurrent.ConcurrentMap;
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import com.comphenix.protocol.Packets;
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import com.comphenix.protocol.ProtocolLibrary;
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import com.comphenix.protocol.error.Report;
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import com.comphenix.protocol.error.ReportType;
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import com.comphenix.protocol.injector.ListenerInvoker;
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import com.comphenix.protocol.injector.player.NetworkFieldInjector.FakePacket;
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import com.comphenix.protocol.utility.MinecraftReflection;
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import com.google.common.collect.MapMaker;
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import net.sf.cglib.proxy.Callback;
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import net.sf.cglib.proxy.Enhancer;
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import net.sf.cglib.proxy.MethodInterceptor;
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import net.sf.cglib.proxy.MethodProxy;
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/**
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* The array list that notifies when packets are sent by the server.
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*
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* @author Kristian
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*/
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class InjectedArrayList extends ArrayList<Object> {
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public static final ReportType REPORT_CANNOT_REVERT_CANCELLED_PACKET = new ReportType("Reverting cancelled packet failed.");
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/**
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* Silly Eclipse.
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*/
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private static final long serialVersionUID = -1173865905404280990L;
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// Fake inverted proxy objects
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private static ConcurrentMap<Object, Object> delegateLookup = new MapMaker().weakKeys().makeMap();
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private transient PlayerInjector injector;
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private transient Set<Object> ignoredPackets;
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private transient ClassLoader classLoader;
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private transient InvertedIntegerCallback callback;
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public InjectedArrayList(ClassLoader classLoader, PlayerInjector injector, Set<Object> ignoredPackets) {
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this.classLoader = classLoader;
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this.injector = injector;
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this.ignoredPackets = ignoredPackets;
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this.callback = new InvertedIntegerCallback();
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}
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@Override
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public boolean add(Object packet) {
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Object result = null;
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// Check for fake packets and ignored packets
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if (packet instanceof FakePacket) {
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return true;
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} else if (ignoredPackets.contains(packet)) {
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// Don't send it to the filters
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result = ignoredPackets.remove(packet);
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} else {
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result = injector.handlePacketSending(packet);
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}
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// A NULL packet indicate cancelling
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try {
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if (result != null) {
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super.add(result);
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} else {
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// We'll use the FakePacket marker instead of preventing the filters
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injector.sendServerPacket(createNegativePacket(packet), true);
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}
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// Collection.add contract
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return true;
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} catch (InvocationTargetException e) {
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// Prefer to report this to the user, instead of risking sending it to Minecraft
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ProtocolLibrary.getErrorReporter().reportDetailed(this,
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Report.newBuilder(REPORT_CANNOT_REVERT_CANCELLED_PACKET).error(e).callerParam(packet)
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);
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// Failure
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return false;
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}
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}
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/**
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* Used by a hack that reverses the effect of a cancelled packet. Returns a packet
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* whereby every int method's return value is inverted (a => -a).
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*
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* @param source - packet to invert.
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* @return The inverted packet.
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*/
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Object createNegativePacket(Object source) {
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ListenerInvoker invoker = injector.getInvoker();
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int packetID = invoker.getPacketID(source);
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// We want to subtract the byte amount that were added to the running
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// total of outstanding packets. Otherwise, cancelling too many packets
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// might cause a "disconnect.overflow" error.
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//
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// We do that by constructing a special packet of the same type that returns
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// a negative integer for all zero-parameter integer methods. This includes the
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// size() method, which is used by the queue method to count the number of
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// bytes to add.
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//
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// Essentially, we have:
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//
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// public class NegativePacket extends [a packet] {
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// @Override
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// public int size() {
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// return -super.size();
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// }
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// ect.
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// }
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Enhancer ex = new Enhancer();
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ex.setSuperclass(MinecraftReflection.getPacketClass());
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ex.setInterfaces(new Class[] { FakePacket.class } );
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ex.setUseCache(true);
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ex.setClassLoader(classLoader);
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ex.setCallbackType(InvertedIntegerCallback.class);
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Class<?> proxyClass = ex.createClass();
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Enhancer.registerCallbacks(proxyClass, new Callback[] { callback });
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try {
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// Temporarily associate the fake packet class
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invoker.registerPacketClass(proxyClass, packetID);
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Object proxy = proxyClass.newInstance();
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InjectedArrayList.registerDelegate(proxy, source);
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return proxy;
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} catch (Exception e) {
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// Don't pollute the throws tree
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throw new RuntimeException("Cannot create fake class.", e);
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} finally {
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// Remove this association
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invoker.unregisterPacketClass(proxyClass);
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}
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}
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/**
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* Ensure that the inverted integer proxy uses the given object as source.
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* @param proxy - inverted integer proxy.
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* @param source - source object.
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*/
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private static void registerDelegate(Object proxy, Object source) {
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delegateLookup.put(proxy, source);
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}
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/**
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* Inverts the integer result of every integer method.
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* @author Kristian
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*/
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private class InvertedIntegerCallback implements MethodInterceptor {
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@Override
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public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
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final Object delegate = delegateLookup.get(obj);
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if (delegate == null) {
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throw new IllegalStateException("Unable to find delegate source for " + obj);
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}
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if (method.getReturnType().equals(int.class) && args.length == 0) {
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Integer result = (Integer) proxy.invoke(delegate, args);
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return -result;
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} else {
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return proxy.invoke(delegate, args);
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}
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}
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}
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}
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/*
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* ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
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* Copyright (C) 2012 Kristian S. Stangeland
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 2 of
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* the License, or (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, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along with this program;
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* if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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package com.comphenix.protocol.injector.player;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.Set;
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import java.util.concurrent.ConcurrentMap;
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import com.comphenix.protocol.ProtocolLibrary;
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import com.comphenix.protocol.error.Report;
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import com.comphenix.protocol.error.ReportType;
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import com.comphenix.protocol.injector.ListenerInvoker;
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import com.comphenix.protocol.injector.player.NetworkFieldInjector.FakePacket;
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import com.comphenix.protocol.utility.MinecraftReflection;
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import com.google.common.collect.MapMaker;
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import net.sf.cglib.proxy.Callback;
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import net.sf.cglib.proxy.Enhancer;
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import net.sf.cglib.proxy.MethodInterceptor;
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import net.sf.cglib.proxy.MethodProxy;
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/**
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* The array list that notifies when packets are sent by the server.
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*
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* @author Kristian
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*/
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class InjectedArrayList extends ArrayList<Object> {
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public static final ReportType REPORT_CANNOT_REVERT_CANCELLED_PACKET = new ReportType("Reverting cancelled packet failed.");
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/**
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* Silly Eclipse.
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*/
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private static final long serialVersionUID = -1173865905404280990L;
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// Fake inverted proxy objects
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private static ConcurrentMap<Object, Object> delegateLookup = new MapMaker().weakKeys().makeMap();
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private transient PlayerInjector injector;
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private transient Set<Object> ignoredPackets;
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private transient ClassLoader classLoader;
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private transient InvertedIntegerCallback callback;
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public InjectedArrayList(ClassLoader classLoader, PlayerInjector injector, Set<Object> ignoredPackets) {
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this.classLoader = classLoader;
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this.injector = injector;
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this.ignoredPackets = ignoredPackets;
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this.callback = new InvertedIntegerCallback();
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}
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@Override
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public boolean add(Object packet) {
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Object result = null;
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// Check for fake packets and ignored packets
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if (packet instanceof FakePacket) {
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return true;
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} else if (ignoredPackets.contains(packet)) {
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// Don't send it to the filters
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result = ignoredPackets.remove(packet);
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} else {
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result = injector.handlePacketSending(packet);
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}
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// A NULL packet indicate cancelling
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try {
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if (result != null) {
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super.add(result);
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} else {
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// We'll use the FakePacket marker instead of preventing the filters
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injector.sendServerPacket(createNegativePacket(packet), true);
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}
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// Collection.add contract
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return true;
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} catch (InvocationTargetException e) {
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// Prefer to report this to the user, instead of risking sending it to Minecraft
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ProtocolLibrary.getErrorReporter().reportDetailed(this,
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Report.newBuilder(REPORT_CANNOT_REVERT_CANCELLED_PACKET).error(e).callerParam(packet)
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);
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// Failure
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return false;
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}
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}
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/**
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* Used by a hack that reverses the effect of a cancelled packet. Returns a packet
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* whereby every int method's return value is inverted (a => -a).
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*
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* @param source - packet to invert.
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* @return The inverted packet.
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*/
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Object createNegativePacket(Object source) {
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ListenerInvoker invoker = injector.getInvoker();
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int packetID = invoker.getPacketID(source);
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// We want to subtract the byte amount that were added to the running
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// total of outstanding packets. Otherwise, cancelling too many packets
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// might cause a "disconnect.overflow" error.
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//
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// We do that by constructing a special packet of the same type that returns
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// a negative integer for all zero-parameter integer methods. This includes the
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// size() method, which is used by the queue method to count the number of
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// bytes to add.
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//
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// Essentially, we have:
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//
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// public class NegativePacket extends [a packet] {
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// @Override
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// public int size() {
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// return -super.size();
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// }
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// ect.
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// }
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Enhancer ex = new Enhancer();
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ex.setSuperclass(MinecraftReflection.getPacketClass());
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ex.setInterfaces(new Class[] { FakePacket.class } );
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ex.setUseCache(true);
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ex.setClassLoader(classLoader);
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ex.setCallbackType(InvertedIntegerCallback.class);
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Class<?> proxyClass = ex.createClass();
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Enhancer.registerCallbacks(proxyClass, new Callback[] { callback });
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try {
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// Temporarily associate the fake packet class
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invoker.registerPacketClass(proxyClass, packetID);
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Object proxy = proxyClass.newInstance();
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InjectedArrayList.registerDelegate(proxy, source);
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return proxy;
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} catch (Exception e) {
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// Don't pollute the throws tree
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throw new RuntimeException("Cannot create fake class.", e);
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} finally {
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// Remove this association
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invoker.unregisterPacketClass(proxyClass);
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}
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}
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/**
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* Ensure that the inverted integer proxy uses the given object as source.
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* @param proxy - inverted integer proxy.
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* @param source - source object.
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*/
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private static void registerDelegate(Object proxy, Object source) {
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delegateLookup.put(proxy, source);
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}
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/**
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* Inverts the integer result of every integer method.
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* @author Kristian
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*/
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private class InvertedIntegerCallback implements MethodInterceptor {
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@Override
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public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
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final Object delegate = delegateLookup.get(obj);
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if (delegate == null) {
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throw new IllegalStateException("Unable to find delegate source for " + obj);
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}
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if (method.getReturnType().equals(int.class) && args.length == 0) {
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Integer result = (Integer) proxy.invoke(delegate, args);
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return -result;
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} else {
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return proxy.invoke(delegate, args);
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}
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}
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}
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}
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