2012-02-20 11:55:59 +08:00
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/*
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2015-10-30 05:45:26 +08:00
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Copyright (C) 2011-2015 de4dot@gmail.com
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2012-02-20 11:55:59 +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;
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using System.Collections.Generic;
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2012-12-20 09:06:09 +08:00
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using dnlib.DotNet;
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2012-02-20 11:55:59 +08:00
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.MaxtoCode {
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class MainType {
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2012-11-18 14:34:51 +08:00
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ModuleDefMD module;
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2012-11-02 22:57:11 +08:00
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TypeDef mcType;
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2012-02-22 19:14:15 +08:00
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bool isOld;
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2013-10-21 00:09:38 +08:00
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ModuleRef runtimeModule1, runtimeModule2;
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2012-02-22 19:14:15 +08:00
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public bool IsOld {
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get { return isOld; }
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}
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2012-02-20 11:55:59 +08:00
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2012-11-02 22:57:11 +08:00
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public TypeDef Type {
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2012-02-21 18:57:47 +08:00
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get { return mcType; }
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}
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2012-11-02 22:57:11 +08:00
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public IEnumerable<MethodDef> InitMethods {
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2012-02-21 18:57:47 +08:00
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get {
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2012-11-02 22:57:11 +08:00
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var list = new List<MethodDef>();
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2012-02-21 18:57:47 +08:00
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if (mcType == null)
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return list;
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foreach (var method in mcType.Methods) {
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2013-01-19 20:03:57 +08:00
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if (method.IsStatic && DotNetUtils.IsMethod(method, "System.Void", "()"))
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2012-02-21 18:57:47 +08:00
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list.Add(method);
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}
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return list;
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}
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}
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2013-10-21 00:09:38 +08:00
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public IEnumerable<ModuleRef> RuntimeModuleRefs {
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get {
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if (runtimeModule1 != null)
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yield return runtimeModule1;
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if (runtimeModule2 != null)
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yield return runtimeModule2;
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}
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}
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2012-02-20 11:55:59 +08:00
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public bool Detected {
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get { return mcType != null; }
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}
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2012-11-18 14:34:51 +08:00
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public MainType(ModuleDefMD module) {
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2012-02-20 11:55:59 +08:00
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this.module = module;
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}
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2012-11-18 14:34:51 +08:00
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public MainType(ModuleDefMD module, MainType oldOne) {
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2012-02-21 00:20:29 +08:00
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this.module = module;
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2013-01-19 20:03:57 +08:00
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this.mcType = Lookup(oldOne.mcType, "Could not find main type");
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2012-02-21 00:20:29 +08:00
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}
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2013-01-19 20:03:57 +08:00
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T Lookup<T>(T def, string errorMessage) where T : class, ICodedToken {
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return DeobUtils.Lookup(module, def, errorMessage);
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2012-02-21 00:20:29 +08:00
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}
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public void Find() {
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foreach (var cctor in DeobUtils.GetInitCctors(module, 3)) {
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if (CheckCctor(cctor))
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2012-03-25 02:14:16 +08:00
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break;
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}
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}
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2013-01-19 20:03:57 +08:00
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bool CheckCctor(MethodDef cctor) {
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foreach (var method in DotNetUtils.GetCalledMethods(module, cctor)) {
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2012-02-20 11:55:59 +08:00
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if (method.Name != "Startup")
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continue;
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2013-01-19 20:03:57 +08:00
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if (!DotNetUtils.IsMethod(method, "System.Void", "()"))
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2012-02-20 11:55:59 +08:00
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continue;
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2012-02-22 19:14:15 +08:00
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bool isOldTmp;
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2013-10-21 00:09:38 +08:00
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if (!CheckType(method.DeclaringType, out runtimeModule1, out runtimeModule2, out isOldTmp))
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2012-03-25 02:14:16 +08:00
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continue;
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2012-02-20 11:55:59 +08:00
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mcType = method.DeclaringType;
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2012-02-22 19:14:15 +08:00
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isOld = isOldTmp;
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2012-03-25 02:14:16 +08:00
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return true;
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2012-02-20 11:55:59 +08:00
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}
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2012-03-25 02:14:16 +08:00
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return false;
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2012-02-20 11:55:59 +08:00
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}
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2013-01-19 20:03:57 +08:00
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static bool CheckType(TypeDef type, out ModuleRef module1, out ModuleRef module2, out bool isOld) {
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2012-02-20 11:55:59 +08:00
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module1 = module2 = null;
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2012-02-22 19:14:15 +08:00
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isOld = false;
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2012-02-20 11:55:59 +08:00
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2012-11-18 14:34:51 +08:00
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if (type.FindMethod("Startup") == null)
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2012-02-20 11:55:59 +08:00
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return false;
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2013-01-19 20:03:57 +08:00
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var pinvokes = GetPinvokes(type);
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var pinvokeList = GetPinvokeList(pinvokes, "CheckRuntime");
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2012-02-20 11:55:59 +08:00
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if (pinvokeList == null)
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return false;
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2013-01-19 20:03:57 +08:00
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if (GetPinvokeList(pinvokes, "MainDLL") == null)
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2012-02-20 11:55:59 +08:00
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return false;
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2012-02-22 19:14:15 +08:00
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// Newer versions (3.4+ ???) also have GetModuleBase()
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2013-01-19 20:03:57 +08:00
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isOld = GetPinvokeList(pinvokes, "GetModuleBase") == null;
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2012-02-20 11:55:59 +08:00
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2012-11-18 14:34:51 +08:00
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module1 = pinvokeList[0].ImplMap.Module;
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module2 = pinvokeList[1].ImplMap.Module;
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2012-02-20 11:55:59 +08:00
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return true;
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}
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2013-01-19 20:03:57 +08:00
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static Dictionary<string, List<MethodDef>> GetPinvokes(TypeDef type) {
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2012-11-02 22:57:11 +08:00
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var pinvokes = new Dictionary<string, List<MethodDef>>(StringComparer.Ordinal);
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2012-02-20 11:55:59 +08:00
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foreach (var method in type.Methods) {
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2012-11-18 14:34:51 +08:00
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var info = method.ImplMap;
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if (info == null || UTF8String.IsNullOrEmpty(info.Name))
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2012-02-20 11:55:59 +08:00
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continue;
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2012-11-02 22:57:11 +08:00
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List<MethodDef> list;
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2012-11-18 14:34:51 +08:00
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if (!pinvokes.TryGetValue(info.Name.String, out list))
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pinvokes[info.Name.String] = list = new List<MethodDef>();
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2012-02-20 11:55:59 +08:00
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list.Add(method);
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}
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return pinvokes;
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}
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2013-01-19 20:03:57 +08:00
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static List<MethodDef> GetPinvokeList(Dictionary<string, List<MethodDef>> pinvokes, string methodName) {
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2012-11-02 22:57:11 +08:00
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List<MethodDef> list;
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2012-02-20 11:55:59 +08:00
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if (!pinvokes.TryGetValue(methodName, out list))
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return null;
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if (list.Count != 2)
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return null;
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return list;
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}
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}
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}
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