2012-01-03 17:38:09 +08:00
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/*
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2012-01-10 06:02:47 +08:00
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Copyright (C) 2011-2012 de4dot@gmail.com
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2012-01-03 17:38:09 +08:00
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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2012-01-14 19:19:17 +08:00
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using System;
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2012-01-03 17:38:09 +08:00
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using System.Collections.Generic;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators {
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abstract class ValueInlinerBase<TValue> : MethodReturnValueInliner {
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2012-07-28 10:22:17 +08:00
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MethodDefinitionAndDeclaringTypeDict<Func<MethodDefinition, GenericInstanceMethod, object[], object>> decrypterMethods = new MethodDefinitionAndDeclaringTypeDict<Func<MethodDefinition, GenericInstanceMethod, object[], object>>();
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2012-08-02 04:18:47 +08:00
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bool removeUnbox = false;
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2012-01-03 17:38:09 +08:00
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class MyCallResult : CallResult {
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public MethodReference methodReference;
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2012-07-28 10:22:17 +08:00
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public GenericInstanceMethod gim;
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public MyCallResult(Block block, int callEndIndex, MethodReference method, GenericInstanceMethod gim)
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2012-01-03 17:38:09 +08:00
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: base(block, callEndIndex) {
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this.methodReference = method;
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2012-07-28 10:22:17 +08:00
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this.gim = gim;
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2012-01-03 17:38:09 +08:00
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}
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}
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2012-08-02 04:18:47 +08:00
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public bool RemoveUnbox {
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get { return removeUnbox; }
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set { removeUnbox = value; }
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}
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2012-01-14 19:34:42 +08:00
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public override bool HasHandlers {
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get { return decrypterMethods.Count != 0; }
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}
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public IEnumerable<MethodDefinition> Methods {
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get { return decrypterMethods.getKeys(); }
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}
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2012-07-28 10:22:17 +08:00
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public void add(MethodDefinition method, Func<MethodDefinition, GenericInstanceMethod, object[], object> handler) {
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if (method == null)
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return;
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if (decrypterMethods.find(method) != null)
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throw new ApplicationException(string.Format("Handler for method {0:X8} has already been added", method.MetadataToken.ToInt32()));
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2012-01-03 17:38:09 +08:00
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if (method != null)
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decrypterMethods.add(method, handler);
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}
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protected override void inlineAllCalls() {
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foreach (var tmp in callResults) {
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var callResult = (MyCallResult)tmp;
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var handler = decrypterMethods.find(callResult.methodReference);
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2012-07-29 15:49:00 +08:00
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callResult.returnValue = handler((MethodDefinition)callResult.methodReference, callResult.gim, callResult.args);
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2012-01-03 17:38:09 +08:00
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}
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}
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2012-07-28 10:22:17 +08:00
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protected override CallResult createCallResult(MethodReference method, GenericInstanceMethod gim, Block block, int callInstrIndex) {
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if (decrypterMethods.find(method) == null)
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return null;
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return new MyCallResult(block, callInstrIndex, method, gim);
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}
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protected bool removeUnboxInstruction(Block block, int index, string unboxType) {
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if (!removeUnbox)
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return false;
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var instrs = block.Instructions;
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if (index >= instrs.Count)
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return false;
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var unbox = instrs[index];
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if (unbox.OpCode.Code != Code.Unbox_Any)
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return false;
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var type = unbox.Operand as TypeReference;
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if (type == null || type.FullName != unboxType)
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return false;
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block.remove(index, 1);
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return true;
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}
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2012-01-03 17:38:09 +08:00
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}
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class BooleanValueInliner : ValueInlinerBase<bool> {
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protected override void inlineReturnValues(IList<CallResult> callResults) {
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foreach (var callResult in callResults) {
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var block = callResult.block;
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int num = callResult.callEndIndex - callResult.callStartIndex + 1;
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block.replace(callResult.callStartIndex, num, DotNetUtils.createLdci4((bool)callResult.returnValue ? 1 : 0));
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removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Boolean");
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2012-01-03 17:38:09 +08:00
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Log.v("Decrypted boolean: {0}", callResult.returnValue);
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}
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}
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}
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class Int32ValueInliner : ValueInlinerBase<int> {
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protected override void inlineReturnValues(IList<CallResult> callResults) {
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foreach (var callResult in callResults) {
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var block = callResult.block;
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int num = callResult.callEndIndex - callResult.callStartIndex + 1;
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block.replace(callResult.callStartIndex, num, DotNetUtils.createLdci4((int)callResult.returnValue));
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2012-08-02 04:18:47 +08:00
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removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Int32");
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2012-01-03 17:38:09 +08:00
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Log.v("Decrypted int32: {0}", callResult.returnValue);
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}
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}
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}
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class Int64ValueInliner : ValueInlinerBase<long> {
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protected override void inlineReturnValues(IList<CallResult> callResults) {
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foreach (var callResult in callResults) {
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var block = callResult.block;
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int num = callResult.callEndIndex - callResult.callStartIndex + 1;
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block.replace(callResult.callStartIndex, num, Instruction.Create(OpCodes.Ldc_I8, (long)callResult.returnValue));
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2012-08-02 04:18:47 +08:00
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removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Int64");
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2012-01-03 17:38:09 +08:00
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Log.v("Decrypted int64: {0}", callResult.returnValue);
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}
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}
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}
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class SingleValueInliner : ValueInlinerBase<float> {
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protected override void inlineReturnValues(IList<CallResult> callResults) {
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foreach (var callResult in callResults) {
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var block = callResult.block;
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int num = callResult.callEndIndex - callResult.callStartIndex + 1;
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block.replace(callResult.callStartIndex, num, Instruction.Create(OpCodes.Ldc_R4, (float)callResult.returnValue));
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removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Single");
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2012-01-03 17:38:09 +08:00
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Log.v("Decrypted single: {0}", callResult.returnValue);
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}
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}
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}
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class DoubleValueInliner : ValueInlinerBase<double> {
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protected override void inlineReturnValues(IList<CallResult> callResults) {
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foreach (var callResult in callResults) {
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var block = callResult.block;
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int num = callResult.callEndIndex - callResult.callStartIndex + 1;
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block.replace(callResult.callStartIndex, num, Instruction.Create(OpCodes.Ldc_R8, (double)callResult.returnValue));
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2012-08-02 04:18:47 +08:00
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removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Double");
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2012-01-03 17:38:09 +08:00
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Log.v("Decrypted double: {0}", callResult.returnValue);
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}
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}
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}
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}
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