137 lines
3.6 KiB
C#
137 lines
3.6 KiB
C#
/*
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Copyright (C) 2011-2015 de4dot@gmail.com
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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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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.ILProtector {
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class MainType {
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ModuleDefMD module;
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List<RuntimeFileInfo> runtimeFileInfos;
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TypeDef invokerDelegate;
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FieldDef invokerInstanceField;
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public List<RuntimeFileInfo> RuntimeFileInfos {
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get { return runtimeFileInfos; }
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}
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public TypeDef InvokerDelegate {
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get { return invokerDelegate; }
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}
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public FieldDef InvokerInstanceField {
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get { return invokerInstanceField; }
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}
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public bool Detected {
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get { return runtimeFileInfos != null; }
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}
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public MainType(ModuleDefMD module) {
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this.module = module;
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}
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public void Find() {
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CheckMethod(DotNetUtils.GetModuleTypeCctor(module));
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}
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static string[] ilpLocalsV1x = new string[] {
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"System.Boolean",
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"System.IntPtr",
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"System.Object[]",
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};
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static string[] ilpLocalsV2x = new string[] {
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"System.IntPtr",
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};
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bool CheckMethod(MethodDef cctor) {
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if (cctor == null || cctor.Body == null)
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return false;
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var localTypes = new LocalTypes(cctor);
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if (!localTypes.Exactly(ilpLocalsV1x) &&
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!localTypes.Exactly(ilpLocalsV2x))
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return false;
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var type = cctor.DeclaringType;
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var methods = GetPinvokeMethods(type, "Protect");
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if (methods.Count == 0)
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methods = GetPinvokeMethods(type, "P0");
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if (methods.Count != 2)
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return false;
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if (type.Fields.Count < 1 || type.Fields.Count > 2)
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return false;
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if (!GetDelegate(type, out invokerInstanceField, out invokerDelegate))
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return false;
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runtimeFileInfos = new List<RuntimeFileInfo>(methods.Count);
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foreach (var method in methods)
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runtimeFileInfos.Add(new RuntimeFileInfo(method));
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return true;
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}
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bool GetDelegate(TypeDef type, out FieldDef field, out TypeDef del) {
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foreach (var fld in type.Fields) {
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var theDelegate = fld.FieldType.TryGetTypeDef();
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if (theDelegate != null && DotNetUtils.DerivesFromDelegate(theDelegate)) {
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field = fld;
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del = theDelegate;
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return true;
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}
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}
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field = null;
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del = null;
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return false;
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}
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static List<MethodDef> GetPinvokeMethods(TypeDef type, string name) {
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var list = new List<MethodDef>();
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foreach (var method in type.Methods) {
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if (method.ImplMap != null && method.ImplMap.Name == name)
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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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public string GetRuntimeVersionString() {
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if (runtimeFileInfos == null)
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return null;
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foreach (var info in runtimeFileInfos) {
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var version = info.GetVersion();
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if (version != null)
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return version.ToString();
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}
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return null;
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}
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public void CleanUp() {
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var cctor = DotNetUtils.GetModuleTypeCctor(module);
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if (cctor != null) {
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cctor.Body.InitLocals = false;
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cctor.Body.Variables.Clear();
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cctor.Body.Instructions.Clear();
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cctor.Body.Instructions.Add(OpCodes.Ret.ToInstruction());
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cctor.Body.ExceptionHandlers.Clear();
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}
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}
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}
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}
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