171 lines
8.5 KiB
Java
171 lines
8.5 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016-2018.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package net.minecraftforge.fml.common.asm;
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import org.objectweb.asm.*;
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import net.minecraft.launchwrapper.IClassTransformer;
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import net.minecraftforge.fml.common.FMLLog;
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import net.minecraftforge.fml.relauncher.FMLSecurityManager.ExitTrappedException;
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public class TerminalTransformer implements IClassTransformer
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{
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@Override
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public byte[] transform(String name, String transformedName, byte[] basicClass)
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{
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if (basicClass == null) return null;
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ClassReader reader = new ClassReader(basicClass);
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ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS);
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ClassVisitor visitor = writer;
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visitor = new ExitVisitor(visitor);
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reader.accept(visitor, 0);
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return writer.toByteArray();
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}
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public static class ExitVisitor extends ClassVisitor
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{
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private String clsName = null;
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private static final String callbackOwner = org.objectweb.asm.Type.getInternalName(ExitVisitor.class);
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private ExitVisitor(ClassVisitor cv)
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{
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super(Opcodes.ASM5, cv);
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}
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@Override
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public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)
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{
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super.visit(version, access, name, signature, superName, interfaces);
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this.clsName = name;
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}
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@Override
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public MethodVisitor visitMethod(int mAccess, final String mName, final String mDesc, String mSignature, String[] mExceptions)
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{
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final boolean warn = !(clsName.equals("net/minecraft/client/Minecraft") ||
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clsName.equals("net/minecraft/server/dedicated/DedicatedServer") ||
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clsName.equals("net/minecraft/server/dedicated/ServerHangWatchdog") ||
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clsName.equals("net/minecraft/server/dedicated/ServerHangWatchdog$1") ||
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clsName.equals("net/minecraftforge/fml/common/FMLCommonHandler") ||
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clsName.startsWith("com/jcraft/jogg/") ||
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clsName.startsWith("scala/sys/") ||
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clsName.startsWith("net/minecraft/server/gui/MinecraftServerGui") ||
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clsName.startsWith("com/sun/jna/")
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);
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return new MethodVisitor(Opcodes.ASM5, super.visitMethod(mAccess, mName, mDesc, mSignature, mExceptions))
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{
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@Override
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public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean isIntf)
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{
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if (opcode == Opcodes.INVOKESTATIC && owner.equals("java/lang/System") && name.equals("exit") && desc.equals("(I)V"))
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{
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if (warn)
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{
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FMLLog.log.warn("=============================================================");
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FMLLog.log.warn("MOD HAS DIRECT REFERENCE System.exit() THIS IS NOT ALLOWED REROUTING TO FML!");
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FMLLog.log.warn("Offender: {}.{}{}", ExitVisitor.this.clsName, mName, mDesc);
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FMLLog.log.warn("Use FMLCommonHandler.exitJava instead");
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FMLLog.log.warn("=============================================================");
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}
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owner = ExitVisitor.callbackOwner;
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name = "systemExitCalled";
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}
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else if (opcode == Opcodes.INVOKEVIRTUAL && owner.equals("java/lang/Runtime") && name.equals("exit") && desc.equals("(I)V"))
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{
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if (warn)
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{
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FMLLog.log.warn("=============================================================");
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FMLLog.log.warn("MOD HAS DIRECT REFERENCE Runtime.exit() THIS IS NOT ALLOWED REROUTING TO FML!");
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FMLLog.log.warn("Offender: {}.{}{}", ExitVisitor.this.clsName, mName, mDesc);
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FMLLog.log.warn("Use FMLCommonHandler.exitJava instead");
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FMLLog.log.warn("=============================================================");
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}
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opcode = Opcodes.INVOKESTATIC;
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owner = ExitVisitor.callbackOwner;
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name = "runtimeExitCalled";
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desc = "(Ljava/lang/Runtime;I)V";
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}
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else if (opcode == Opcodes.INVOKEVIRTUAL && owner.equals("java/lang/Runtime") && name.equals("halt") && desc.equals("(I)V"))
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{
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if (warn)
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{
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FMLLog.log.warn("=============================================================");
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FMLLog.log.warn("MOD HAS DIRECT REFERENCE Runtime.halt() THIS IS NOT ALLOWED REROUTING TO FML!");
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FMLLog.log.warn("Offendor: {}.{}{}", ExitVisitor.this.clsName, mName, mDesc);
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FMLLog.log.warn("Use FMLCommonHandler.exitJava instead");
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FMLLog.log.warn("=============================================================");
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}
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opcode = Opcodes.INVOKESTATIC;
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owner = ExitVisitor.callbackOwner;
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name = "runtimeHaltCalled";
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desc = "(Ljava/lang/Runtime;I)V";
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}
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super.visitMethodInsn(opcode, owner, name, desc, isIntf);
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}
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};
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}
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// Intercept System.exit, and check if the caller is allowed to use it, if not wrap it in a ExitTrappedException
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public static void systemExitCalled(int status)
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{
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ExitVisitor.checkAccess();
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System.exit(status);
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}
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// Intercept Runtime.getRuntime().exit, and check if the caller is allowed to use it, if not wrap it in a ExitTrappedException
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public static void runtimeExitCalled(Runtime runtime, int status)
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{
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ExitVisitor.checkAccess();
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runtime.exit(status);
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}
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// Intercept Runtime.getRuntime().halt, and check if the caller is allowed to use it, if not wrap it in a ExitTrappedException
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public static void runtimeHaltCalled(Runtime runtime, int status)
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{
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ExitVisitor.checkAccess();
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runtime.halt(status);
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}
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private static void checkAccess()
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{
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StackTraceElement[] cause = Thread.currentThread().getStackTrace();
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String callingClass = cause.length > 2 ? cause[3].getClassName() : "none";
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String callingParent = cause.length > 3 ? cause[4].getClassName() : "none";
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// FML is allowed to call system exit and the Minecraft applet (from the quit button), and the dedicated server (from itself)
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boolean allowed = false;
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allowed |= callingClass.startsWith("net.minecraftforge.fml.");
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allowed |= callingClass.equals("net.minecraft.client.Minecraft") && callingParent.equals("net.minecraft.client.Minecraft");
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allowed |= callingClass.equals("net.minecraft.server.gui.MinecraftServerGui$1") && callingParent.equals("java.awt.AWTEventMulticaster");
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allowed |= callingClass.equals("net.minecraft.server.dedicated.DedicatedServer") && callingParent.equals("net.minecraft.server.MinecraftServer");
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allowed |= callingClass.equals("net.minecraft.server.dedicated.ServerHangWatchdog");
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allowed |= callingClass.equals("net.minecraft.server.dedicated.ServerHangWatchdog$1");
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if (!allowed)
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{
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throw new ExitTrappedException();
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}
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}
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}
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}
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