2013-10-26 23:25:58 +08:00
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/*
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2014-03-12 05:15:43 +08:00
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Copyright (C) 2011-2014 de4dot@gmail.com
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2013-10-26 23:25:58 +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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using System.Collections.Generic;
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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namespace de4dot.code.deobfuscators.ILProtector {
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abstract class MethodsDecrypterBase {
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protected ModuleDefMD module;
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protected MainType mainType;
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protected EmbeddedResource methodsResource;
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protected Dictionary<int, DecryptedMethodInfo> methodInfos = new Dictionary<int, DecryptedMethodInfo>();
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List<TypeDef> delegateTypes = new List<TypeDef>();
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public EmbeddedResource Resource {
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get { return methodsResource; }
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}
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public IEnumerable<TypeDef> DelegateTypes {
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get { return delegateTypes; }
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}
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2014-03-08 03:57:26 +08:00
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public bool MethodReaderHasDelegateTypeFlag { get; set; }
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2013-10-26 23:25:58 +08:00
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public MethodsDecrypterBase(ModuleDefMD module, MainType mainType) {
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this.module = module;
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this.mainType = mainType;
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}
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public void Decrypt() {
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DecryptInternal();
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RestoreMethods();
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}
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protected abstract void DecryptInternal();
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void RestoreMethods() {
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if (methodInfos.Count == 0)
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return;
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Logger.v("Restoring {0} methods", methodInfos.Count);
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Logger.Instance.Indent();
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foreach (var type in module.GetTypes()) {
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foreach (var method in type.Methods) {
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if (method.Body == null)
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continue;
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if (RestoreMethod(method)) {
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Logger.v("Restored method {0} ({1:X8}). Instrs:{2}, Locals:{3}, Exceptions:{4}",
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Utils.RemoveNewlines(method.FullName),
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method.MDToken.ToInt32(),
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method.Body.Instructions.Count,
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method.Body.Variables.Count,
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method.Body.ExceptionHandlers.Count);
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}
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}
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}
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Logger.Instance.DeIndent();
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if (methodInfos.Count != 0)
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Logger.w("{0} methods weren't restored", methodInfos.Count);
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}
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bool RestoreMethod(MethodDef method) {
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int? methodId = GetMethodId(method);
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if (methodId == null)
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return false;
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var parameters = method.Parameters;
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var methodInfo = methodInfos[methodId.Value];
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methodInfos.Remove(methodId.Value);
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var methodReader = new MethodReader(module, methodInfo.data, parameters);
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2014-03-08 03:57:26 +08:00
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methodReader.HasDelegateTypeFlag = MethodReaderHasDelegateTypeFlag;
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2014-05-10 15:00:43 +08:00
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methodReader.Read(method);
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2013-10-26 23:25:58 +08:00
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RestoreMethod(method, methodReader);
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2014-03-08 03:57:26 +08:00
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if (methodReader.DelegateType != null)
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delegateTypes.Add(methodReader.DelegateType);
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2013-10-26 23:25:58 +08:00
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return true;
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}
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static void RestoreMethod(MethodDef method, MethodReader methodReader) {
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// body.MaxStackSize = <let dnlib calculate this>
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method.Body.InitLocals = methodReader.InitLocals;
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methodReader.RestoreMethod(method);
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}
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protected int? GetMethodId(MethodDef method) {
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if (method == null || method.Body == null)
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return null;
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var instrs = method.Body.Instructions;
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for (int i = 0; i < instrs.Count - 1; i++) {
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var ldsfld = instrs[i];
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if (ldsfld.OpCode.Code != Code.Ldsfld)
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continue;
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var ldci4 = instrs[i + 1];
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if (!ldci4.IsLdcI4())
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continue;
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var field = ldsfld.Operand as FieldDef;
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if (field == null || field != mainType.InvokerInstanceField)
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continue;
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return ldci4.GetLdcI4Value();
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}
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return null;
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}
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}
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}
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