IClassTransformer doesn't work in obfuscated environment

[cbOP_]

Hello guys!

 

I have a simple IClassTransformer implementation, which prints everything it does. In both consoles, in obfuscated and deobfuscated environment, everything is printed out, but only in deobfuscated environment the byte code is patched! Whats happening there?

 

cbOP_

[cbOP_]

  On 9/17/2014 at 8:33 PM, diesieben07 said:

Magic Code Viewer broken. Please provide manual input. Thank you.

Ich weiß nicht genau was du meinst. Kannst du das nochmal auf deutsch schreiben?

[cbOP_]

Asm

package cbop.core.loader.asm;

import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.FieldInsnNode;
import org.objectweb.asm.tree.FieldNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.TypeInsnNode;

/**
* The Class Asm.
* 
* @author cbOP_
*/
public class Asm {

public String owner;
public String name;
public String desc;

public Asm(String owner, String name, String desc) {
	this.owner = owner;
	this.name = name;
	this.desc = desc;
	if (owner.contains(".")) {
		throw new IllegalArgumentException(owner);
	}
}

public static Asm fromDesc(String s) {
	int lastDot = s.lastIndexOf('.');
	if (lastDot < 0) {
		return new Asm(s, "", "");
	}
	int sep = s.indexOf('(');
	int sep_end = sep;
	if (sep < 0) {
		sep = s.indexOf(' ');
		sep_end = sep + 1;
	}
	if (sep < 0) {
		sep = s.indexOf(':');
		sep_end = sep + 1;
	}
	if (sep < 0) {
		return new Asm(s.substring(0, lastDot),
				s.substring(lastDot + 1), "");
	}
	return new Asm(s.substring(0, lastDot), s.substring(lastDot + 1,
			sep), s.substring(sep_end));
}

public boolean matches(MethodNode node) {
	return name.equals(node.name) && desc.equals(node.desc);
}

public boolean matches(MethodInsnNode node) {
	return owner.equals(node.owner) && name.equals(node.name)
			&& desc.equals(node.desc);
}

public AbstractInsnNode toInsn(int opcode) {
	if (isClass()) {
		return new TypeInsnNode(opcode, owner);
	} else if (isMethod()) {
		return new MethodInsnNode(opcode, owner, name, desc);
	} else {
		return new FieldInsnNode(opcode, owner, name, desc);
	}
}

public boolean isClass(String name) {
	return name.replace('.', '/').equals(owner);
}

public boolean matches(String name, String desc) {
	return name.equals(name) && desc.equals(desc);
}

public boolean matches(FieldNode node) {
	return name.equals(node.name) && desc.equals(node.desc);
}

public boolean matches(FieldInsnNode node) {
	return owner.equals(node.owner) && name.equals(node.name)
			&& desc.equals(node.desc);
}

public String javaClass() {
	return owner.replace('/', '.');
}

public String methodDesc() {
	return owner + "." + name + desc;
}

public String fieldDesc() {
	return owner + "." + name + ":" + desc;
}

public boolean isClass() {
	return name.length() == 0;
}

public boolean isMethod() {
	return desc.contains("(");
}

public boolean isField() {
	return !isClass() && !isMethod();
}
}

AsmClass, AsmMethod and AsmField just extend Asm with a constructor.

 

NAPITransformer

package cbop.core.napi.transform;

import net.minecraft.launchwrapper.IClassTransformer;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.AnnotationNode;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.MethodNode;

import cbop.core.loader.asm.AsmClass;
import cbop.core.loader.asm.AsmField;
import cbop.core.loader.asm.AsmMethod;
import cpw.mods.fml.common.FMLCommonHandler;
import cpw.mods.fml.relauncher.Side;

/**
* The Class CoreTransformer.
* 
* @author cbOP_
*/
public class NAPITransformer implements IClassTransformer {

public AsmClass c_IIconRegister = new AsmClass("net/minecraft/client/renderer/texture/IIconRegister");
public AsmClass c_ITileEntityProvider = new AsmClass("net/minecraft/block/ITileEntityProvider");
public AsmClass c_World = new AsmClass("net/minecraft/world/World");
public AsmClass c_Block = new AsmClass("net/minecraft/block/Block");
public AsmClass c_TileEntity = new AsmClass("net/minecraft/tileentity/TileEntity");

public AsmMethod m_renderAsNormalBlock = new AsmMethod("net/minecraft/block/Block", "renderAsNormalBlock", "()Z");
public AsmMethod m_isOpaqueCube = new AsmMethod("net/minecraft/block/Block", "isOpaqueCube", "()Z");
public AsmMethod m_getRenderType = new AsmMethod("net/minecraft/block/Block", "getRenderType", "()I");
public AsmMethod m_registerBlockIcons = new AsmMethod("net/minecraft/block/Block", "registerBlockIcons", "(Lnet/minecraft/client/renderer/texture/IIconRegister;)V");
public AsmMethod m_createNewTileEntity = new AsmMethod("net/minecraft/block/ITileEntityProvider", "createNewTileEntity", "(Lnet/minecraft/world/World;I)Lnet/minecraft/tileentity/TileEntity;");
public AsmMethod m_breakBlock = new AsmMethod("net/minecraft/block/Block", "breakBlock", "(Lnet/minecraft/world/World;IIILnet/minecraft/block/Block;I)V");
public AsmMethod m_removeTileEntity = new AsmMethod("net/minecraft/world/World", "removeTileEntity", "(III)V");
public AsmMethod m_onBlockEventReceived = new AsmMethod("net/minecraft/block/Block", "onBlockEventReceived", "(Lnet/minecraft/world/World;IIIII)Z");
public AsmMethod m_getTileEntity = new AsmMethod("net/minecraft/world/World", "getTileEntity", "(III)Lnet/minecraft/tileentity/TileEntity;");
public AsmMethod m_registerIcons = new AsmMethod("net/minecraft/item/Item", "registerIcons", "(Lnet/minecraft/client/renderer/texture/IIconRegister;)V");

public AsmField f_isBlockContainer = new AsmField("net/minecraft/block/Block", "isBlockContainer", "Z");

private String annotation;
private ClassNode classNode;

@Override
public byte[] transform(String name, String transformedName, byte[] bytes) {
	if (bytes == null) {
		return null;
	}
	classNode = new ClassNode();
	ClassReader classReader = new ClassReader(bytes);
	classReader.accept(classNode, 0);
	{
		addAnnotation("BlockRenderer");
		addAnnotation("ItemRenderer");
		addAnnotation("TEProvider");
	}
	ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS);
	classNode.accept(writer);
	return writer.toByteArray();
}

private void addAnnotation(String name) {
	AnnotationNode node = null;
	if (classNode.visibleAnnotations != null) {
		for (AnnotationNode an : classNode.visibleAnnotations) {
			if (an.desc.equals("Lcbop/core/napi/" + name + ";")) {
				node = an;
				break;
			}
		}
	}
	if (node == null) {
		return;
	}
	this.annotation = name;
	debugAnnotation(classNode, name);
	try {
		Annotation a = (Annotation) Class.forName("cbop.core.napi.transform." + annotation).newInstance();
		boolean client = a.apply(this);
		if (client && FMLCommonHandler.instance().getSide() != Side.CLIENT) {
			classNode.visibleAnnotations.remove(node);
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
}

public void addInterface(AsmClass inf) {
	if (!hasInterface(classNode, inf)) {
		classNode.interfaces.add(inf.owner);
		debugInterface(inf);
	}
}

public void addMethod(AsmMethod method, boolean client) {
	if (!hasMethod(classNode, method) &&
			client ? FMLCommonHandler.instance().getSide() == Side.CLIENT : true) {
		MethodNode mn = new MethodNode(Opcodes.ACC_PUBLIC, method.name, method.desc, null, null);
		try {
			Method m = (Method) Class.forName("cbop.core.napi.transform."
				+ annotation + "_" + method.name).newInstance();
			m.apply(this, classNode, mn);
		} catch (Exception e) {
			e.printStackTrace();
		}
		classNode.methods.add(mn);
		debugMethod(method);
	}
}

public void addConstructor() {
	try {
		Constructor c = (Constructor) Class.forName("cbop.core.napi.transform."
			+ annotation + "_constructor").newInstance();
		for (MethodNode mn : classNode.methods) {
			if (mn.name.equals("<init>")) {
				c.apply(this, classNode, mn);
				debugContructor(mn);
			}
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
}

private boolean hasInterface(ClassNode classNode, AsmClass c) {
	for (String i : classNode.interfaces) {
		if (c.isClass(i)) {
			return true;
		}
	}
	return false;
}

private boolean hasMethod(ClassNode classNode, AsmMethod m) {
	for (MethodNode mn : classNode.methods) {
		if (m.matches(mn)) {
			return true;
		}
	}
	return false;
}

private void debugAnnotation(ClassNode classNode, String name) {
	System.out.println("[cbOP_ Core] Transforming @" + name + " in " + classNode.name);
}

private void debugInterface(AsmClass inf) {
	System.out.println("[cbOP_ Core]     => Added interface " + inf.owner);
}

private void debugMethod(AsmMethod method) {
	System.out.println("[cbOP_ Core]     => Generated " + method.name);
}

private void debugContructor(MethodNode mn) {
	System.out.println("[cbOP_ Core]     => Modified constructor " + mn.desc);
}
}

 

BlockRenderer

package cbop.core.napi.transform;

public class BlockRenderer implements Annotation {

@Override
public boolean apply(NAPITransformer napi) {
	napi.addMethod(napi.m_renderAsNormalBlock, false);
	napi.addMethod(napi.m_isOpaqueCube, false);
	napi.addMethod(napi.m_getRenderType, true);
	napi.addMethod(napi.m_registerBlockIcons, true);
	return true;
}
}

 

BlockRenderer_getRenderType

package cbop.core.napi.transform;

import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.LabelNode;
import org.objectweb.asm.tree.LocalVariableNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;

public class BlockRenderer_getRenderType implements Method {

@Override
public void apply(NAPITransformer napi, ClassNode cn, MethodNode mn) {
	mn.maxLocals = 1;
	mn.maxStack = 1;
	mn.localVariables.add(new LocalVariableNode("this", "L" + cn.name + ";",
			null, new LabelNode(), new LabelNode(), 0));
	mn.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC,
			"cbop/core/napi/NAPI", "getBlockRenderer", "()I"));
	mn.instructions.add(new InsnNode(Opcodes.IRETURN));
}
}

[cbOP_]

  On 9/17/2014 at 9:28 PM, diesieben07 said:

In the obfuscated environment you will have to use SRG names (field_xxxx_xx / fuinc_xxxx_xx). Also, on a side node: What the actual fuck are you doing

So

1. Where can I find the SRG names in the obfuscated environment?

2. Ich hab das so für mich ausgelegt wie es für mich am einfachsten ist das zu erweitern. Außerdem ist alles in einer Klasse unübersichtlich.

Wenn du meinst warum ich getRenderType und so generieren lasse, das ist weniger Code für mich

[cbOP_]

Is there any way to check if its in obfuscated environment?