725 lines
22 KiB
C#
725 lines
22 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;
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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.blocks {
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public enum FrameworkType {
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Unknown,
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Desktop,
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Silverlight, // and WindowsPhone, XNA Xbox360
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CompactFramework,
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XNA,
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Zune,
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}
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public class CallCounter {
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Dictionary<IMethod, int> calls = new Dictionary<IMethod, int>(MethodEqualityComparer.CompareDeclaringTypes);
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public void Add(IMethod calledMethod) {
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int count;
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calls.TryGetValue(calledMethod, out count);
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calls[calledMethod] = count + 1;
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}
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public IMethod Most() {
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int numCalls;
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return Most(out numCalls);
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}
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public IMethod Most(out int numCalls) {
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IMethod method = null;
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int callCount = 0;
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foreach (var key in calls.Keys) {
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if (calls[key] > callCount) {
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callCount = calls[key];
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method = key;
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}
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}
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numCalls = callCount;
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return method;
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}
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}
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public static class DotNetUtils {
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public static TypeDef GetModuleType(ModuleDef module) {
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return module.GlobalType;
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}
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public static MethodDef GetModuleTypeCctor(ModuleDef module) {
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return module.GlobalType.FindStaticConstructor();
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}
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public static bool IsEmpty(MethodDef method) {
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if (method.Body == null)
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return false;
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foreach (var instr in method.Body.Instructions) {
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var code = instr.OpCode.Code;
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if (code != Code.Nop && code != Code.Ret)
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return false;
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}
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return true;
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}
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public static bool IsEmptyObfuscated(MethodDef method) {
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if (method.Body == null)
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return false;
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int index = 0;
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var instr = GetInstruction(method.Body.Instructions, ref index);
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if (instr == null || instr.OpCode.Code != Code.Ret)
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return false;
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return true;
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}
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public static FieldDef FindFieldType(TypeDef typeDef, string typeName, bool isStatic) {
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if (typeDef == null)
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return null;
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foreach (var field in typeDef.Fields) {
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if (field.IsStatic == isStatic && field.FieldSig.GetFieldType().GetFullName() == typeName)
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return field;
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}
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return null;
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}
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public static IEnumerable<MethodDef> FindMethods(IEnumerable<MethodDef> methods, string returnType, string[] argsTypes) {
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return FindMethods(methods, returnType, argsTypes, true);
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}
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public static IEnumerable<MethodDef> FindMethods(IEnumerable<MethodDef> methods, string returnType, string[] argsTypes, bool isStatic) {
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foreach (var method in methods) {
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var sig = method.MethodSig;
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if (sig == null || !method.HasBody || !sig.IsDefault)
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continue;
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if (method.IsStatic != isStatic || sig.Params.Count != argsTypes.Length)
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continue;
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if (sig.GenParamCount > 0)
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continue;
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if (sig.RetType.GetFullName() != returnType)
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continue;
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for (int i = 0; i < argsTypes.Length; i++) {
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if (sig.Params[i].GetFullName() != argsTypes[i])
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goto next;
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}
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yield return method;
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next: ;
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}
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}
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public static bool IsDelegate(IType type) {
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if (type == null)
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return false;
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var fn = type.FullName;
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return fn == "System.Delegate" || fn == "System.MulticastDelegate";
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}
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public static bool DerivesFromDelegate(TypeDef type) {
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return type != null && IsDelegate(type.BaseType);
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}
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public static bool IsMethod(IMethod method, string returnType, string parameters) {
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return method != null && method.FullName == returnType + " " + method.DeclaringType.FullName + "::" + method.Name + parameters;
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}
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public static string GetDllName(string dll) {
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if (dll.EndsWith(".dll", StringComparison.OrdinalIgnoreCase))
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return dll.Substring(0, dll.Length - 4);
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return dll;
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}
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public static bool HasPinvokeMethod(TypeDef type, string methodName) {
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return GetPInvokeMethod(type, methodName) != null;
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}
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public static MethodDef GetPInvokeMethod(TypeDef type, string methodName) {
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if (type == null)
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return null;
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UTF8String mname = methodName;
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foreach (var method in type.Methods) {
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if (method.ImplMap == null)
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continue;
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if (UTF8String.Equals(method.ImplMap.Name, mname))
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return method;
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}
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return null;
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}
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public static MethodDef GetPInvokeMethod(TypeDef type, string dll, string funcName) {
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foreach (var method in type.Methods) {
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if (IsPinvokeMethod(method, dll, funcName))
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return method;
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}
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return null;
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}
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public static bool IsPinvokeMethod(MethodDef method, string dll, string funcName) {
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if (method == null)
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return false;
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if (method.ImplMap == null)
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return false;
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return method.ImplMap.IsPinvokeMethod(dll, funcName);
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}
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public static MethodDef GetMethod(ModuleDefMD module, IMethod method) {
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if (method == null)
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return null;
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return GetMethod(module, method, method.DeclaringType);
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}
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public static MethodDef GetMethod2(ModuleDefMD module, IMethod method) {
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if (method == null)
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return null;
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if (method is MethodDef)
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return (MethodDef)method;
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var git = method.DeclaringType.TryGetGenericInstSig();
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var dt = git == null ? method.DeclaringType : git.GenericType.TypeDefOrRef;
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return GetMethod(module, method, dt);
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}
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static MethodDef GetMethod(ModuleDefMD module, IMethod method, ITypeDefOrRef declaringType) {
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if (method == null)
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return null;
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if (method is MethodDef)
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return (MethodDef)method;
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return GetMethod(GetType(module, declaringType), method);
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}
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public static MethodDef GetMethod(TypeDef type, string returnType, string parameters) {
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foreach (var method in type.Methods) {
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if (IsMethod(method, returnType, parameters))
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return method;
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}
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return null;
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}
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public static MethodDef GetMethod2(ModuleDef module, IMethod method) {
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if (method == null)
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return null;
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return GetMethod(module, method, method.DeclaringType.ScopeType);
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}
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public static TypeDef GetType(ModuleDef module, TypeSig type) {
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type = type.RemovePinnedAndModifiers();
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var tdr = type as TypeDefOrRefSig;
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if (tdr == null)
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return null;
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return GetType(module, tdr.TypeDefOrRef);
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}
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public static TypeDef GetType(ModuleDef module, ITypeDefOrRef type) {
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var td = type as TypeDef;
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if (td == null) {
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var tr = type as TypeRef;
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if (tr != null) {
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var trAsm = tr.DefinitionAssembly;
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var modAsm = module.Assembly;
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if (trAsm != null && modAsm != null && trAsm.Name == modAsm.Name)
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td = tr.Resolve();
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}
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}
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return td != null && td.Module == module ? td : null;
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}
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static MethodDef GetMethod(ModuleDef module, IMethod method, ITypeDefOrRef declaringType) {
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if (method == null)
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return null;
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if (method is MethodDef)
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return (MethodDef)method;
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return GetMethod(GetType(module, declaringType), method);
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}
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public static MethodDef GetMethod(TypeDef type, IMethod methodRef) {
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if (type == null || methodRef == null)
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return null;
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if (methodRef is MethodDef)
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return (MethodDef)methodRef;
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return type.FindMethod(methodRef.Name, methodRef.MethodSig);
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}
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public static IEnumerable<MethodDef> GetNormalMethods(TypeDef type) {
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foreach (var method in type.Methods) {
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if (method.HasImplMap)
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continue;
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if (method.IsConstructor)
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continue;
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yield return method;
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}
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}
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public static FieldDef GetField(ModuleDef module, IField field) {
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if (field == null)
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return null;
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if (field is FieldDef)
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return (FieldDef)field;
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return GetField(GetType(module, field.DeclaringType), field);
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}
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public static FieldDef GetField(TypeDef type, IField fieldRef) {
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if (type == null || fieldRef == null)
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return null;
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if (fieldRef is FieldDef)
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return (FieldDef)fieldRef;
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return type.FindField(fieldRef.Name, fieldRef.FieldSig);
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}
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public static FieldDef GetField(TypeDef type, string typeFullName) {
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if (type == null)
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return null;
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foreach (var field in type.Fields) {
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if (field.FieldSig.GetFieldType().GetFullName() == typeFullName)
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return field;
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}
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return null;
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}
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public static IEnumerable<IMethod> GetMethodCalls(MethodDef method) {
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var list = new List<IMethod>();
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if (method.HasBody) {
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foreach (var instr in method.Body.Instructions) {
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var calledMethod = instr.Operand as IMethod;
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if (calledMethod != null)
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list.Add(calledMethod);
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}
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}
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return list;
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}
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public static bool HasString(MethodDef method, string s) {
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if (method == null || method.Body == null)
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return false;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code == Code.Ldstr && (string)instr.Operand == s)
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return true;
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}
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return false;
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}
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public static IList<string> GetCodeStrings(MethodDef method) {
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var strings = new List<string>();
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if (method != null && method.Body != null) {
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code == Code.Ldstr)
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strings.Add((string)instr.Operand);
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}
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}
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return strings;
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}
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public static Resource GetResource(ModuleDef module, string name) {
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return GetResource(module, new List<string> { name });
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}
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public static Resource GetResource(ModuleDef module, IEnumerable<string> strings) {
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if (!module.HasResources)
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return null;
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var resources = module.Resources;
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foreach (var tmp in strings) {
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var resourceName = RemoveFromNullChar(tmp);
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if (resourceName == null)
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continue;
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UTF8String name = resourceName;
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foreach (var resource in resources) {
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if (UTF8String.Equals(resource.Name, name))
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return resource;
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}
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}
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return null;
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}
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static string RemoveFromNullChar(string s) {
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int index = s.IndexOf((char)0);
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if (index < 0)
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return s;
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return s.Substring(0, index);
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}
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// Copies most things but not everything
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public static MethodDef Clone(MethodDef method) {
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var newMethod = new MethodDefUser(method.Name, method.MethodSig, method.ImplAttributes, method.Attributes);
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newMethod.Rid = method.Rid;
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newMethod.DeclaringType2 = method.DeclaringType;
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foreach (var pd in method.ParamDefs)
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newMethod.ParamDefs.Add(new ParamDefUser(pd.Name, pd.Sequence, pd.Attributes));
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foreach (var gp in method.GenericParameters) {
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var newGp = new GenericParamUser(gp.Number, gp.Flags, gp.Name);
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foreach (var gpc in gp.GenericParamConstraints)
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newGp.GenericParamConstraints.Add(new GenericParamConstraintUser(gpc.Constraint));
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newMethod.GenericParameters.Add(newGp);
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}
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newMethod.Body = new CilBody();
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CopyBodyFromTo(method, newMethod);
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return newMethod;
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}
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public static void CopyBody(MethodDef method, out IList<Instruction> instructions, out IList<ExceptionHandler> exceptionHandlers) {
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if (method == null || !method.HasBody) {
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instructions = new List<Instruction>();
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exceptionHandlers = new List<ExceptionHandler>();
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return;
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}
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var oldInstrs = method.Body.Instructions;
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var oldExHandlers = method.Body.ExceptionHandlers;
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instructions = new List<Instruction>(oldInstrs.Count);
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exceptionHandlers = new List<ExceptionHandler>(oldExHandlers.Count);
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var oldToIndex = Utils.CreateObjectToIndexDictionary(oldInstrs);
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foreach (var oldInstr in oldInstrs)
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instructions.Add(oldInstr.Clone());
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foreach (var newInstr in instructions) {
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var operand = newInstr.Operand;
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if (operand is Instruction)
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newInstr.Operand = instructions[oldToIndex[(Instruction)operand]];
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else if (operand is IList<Instruction>) {
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var oldArray = (IList<Instruction>)operand;
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var newArray = new Instruction[oldArray.Count];
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for (int i = 0; i < oldArray.Count; i++)
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newArray[i] = instructions[oldToIndex[oldArray[i]]];
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newInstr.Operand = newArray;
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}
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}
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foreach (var oldEx in oldExHandlers) {
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var newEx = new ExceptionHandler(oldEx.HandlerType) {
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TryStart = GetInstruction(instructions, oldToIndex, oldEx.TryStart),
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TryEnd = GetInstruction(instructions, oldToIndex, oldEx.TryEnd),
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FilterStart = GetInstruction(instructions, oldToIndex, oldEx.FilterStart),
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HandlerStart = GetInstruction(instructions, oldToIndex, oldEx.HandlerStart),
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HandlerEnd = GetInstruction(instructions, oldToIndex, oldEx.HandlerEnd),
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CatchType = oldEx.CatchType,
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};
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exceptionHandlers.Add(newEx);
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}
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}
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static Instruction GetInstruction(IList<Instruction> instructions, IDictionary<Instruction, int> instructionToIndex, Instruction instruction) {
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if (instruction == null)
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return null;
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return instructions[instructionToIndex[instruction]];
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}
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public static void RestoreBody(MethodDef method, IEnumerable<Instruction> instructions, IEnumerable<ExceptionHandler> exceptionHandlers) {
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if (method == null || method.Body == null)
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return;
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var bodyInstrs = method.Body.Instructions;
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bodyInstrs.Clear();
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foreach (var instr in instructions)
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bodyInstrs.Add(instr);
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var bodyExceptionHandlers = method.Body.ExceptionHandlers;
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bodyExceptionHandlers.Clear();
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foreach (var eh in exceptionHandlers)
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bodyExceptionHandlers.Add(eh);
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}
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public static void CopyBodyFromTo(MethodDef fromMethod, MethodDef toMethod) {
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if (fromMethod == toMethod)
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return;
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IList<Instruction> instructions;
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IList<ExceptionHandler> exceptionHandlers;
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CopyBody(fromMethod, out instructions, out exceptionHandlers);
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RestoreBody(toMethod, instructions, exceptionHandlers);
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CopyLocalsFromTo(fromMethod, toMethod);
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UpdateInstructionOperands(fromMethod, toMethod);
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}
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static void CopyLocalsFromTo(MethodDef fromMethod, MethodDef toMethod) {
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var fromBody = fromMethod.Body;
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var toBody = toMethod.Body;
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toBody.Variables.Clear();
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foreach (var local in fromBody.Variables)
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toBody.Variables.Add(new Local(local.Type));
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}
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static void UpdateInstructionOperands(MethodDef fromMethod, MethodDef toMethod) {
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var fromBody = fromMethod.Body;
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var toBody = toMethod.Body;
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toBody.InitLocals = fromBody.InitLocals;
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toBody.MaxStack = fromBody.MaxStack;
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var newOperands = new Dictionary<object, object>();
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var fromParams = fromMethod.Parameters;
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var toParams = toMethod.Parameters;
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for (int i = 0; i < fromParams.Count; i++)
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newOperands[fromParams[i]] = toParams[i];
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for (int i = 0; i < fromBody.Variables.Count; i++)
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newOperands[fromBody.Variables[i]] = toBody.Variables[i];
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foreach (var instr in toBody.Instructions) {
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if (instr.Operand == null)
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continue;
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object newOperand;
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if (newOperands.TryGetValue(instr.Operand, out newOperand))
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instr.Operand = newOperand;
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}
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}
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public static string GetCustomArgAsString(CustomAttribute cattr, int arg) {
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if (cattr == null || arg >= cattr.ConstructorArguments.Count)
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return null;
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var carg = cattr.ConstructorArguments[arg];
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if (carg.Type.GetElementType() != ElementType.String)
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return null;
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return UTF8String.ToSystemStringOrEmpty((UTF8String)carg.Value);
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}
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public static IEnumerable<MethodDef> GetCalledMethods(ModuleDef module, MethodDef method) {
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if (method != null && method.HasBody) {
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foreach (var call in method.Body.Instructions) {
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if (call.OpCode.Code != Code.Call && call.OpCode.Code != Code.Callvirt)
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continue;
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var methodRef = call.Operand as IMethod;
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if (methodRef == null)
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continue;
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var type = GetType(module, methodRef.DeclaringType);
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var methodDef = GetMethod(type, methodRef);
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if (methodDef != null)
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yield return methodDef;
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}
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}
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}
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public static IList<Instruction> GetInstructions(IList<Instruction> instructions, int i, params OpCode[] opcodes) {
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if (i + opcodes.Length > instructions.Count)
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return null;
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if (opcodes.Length == 0)
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return new List<Instruction>();
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if (opcodes[0] != instructions[i].OpCode)
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return null;
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var list = new List<Instruction>(opcodes.Length);
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for (int j = 0; j < opcodes.Length; j++) {
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var instr = instructions[i + j];
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if (instr.OpCode != opcodes[j])
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return null;
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list.Add(instr);
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}
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return list;
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}
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|
|
public static bool HasReturnValue(IMethod method) {
|
|
if (method == null || method.MethodSig == null || method.MethodSig.RetType == null)
|
|
return false;
|
|
return method.MethodSig.RetType.RemovePinnedAndModifiers().ElementType != ElementType.Void;
|
|
}
|
|
|
|
public static Parameter GetParameter(IList<Parameter> parameters, int index) {
|
|
if (0 <= index && index < parameters.Count)
|
|
return parameters[index];
|
|
return null;
|
|
}
|
|
|
|
public static TypeSig GetArg(IList<TypeSig> args, int index) {
|
|
if (0 <= index && index < args.Count)
|
|
return args[index];
|
|
return null;
|
|
}
|
|
|
|
public static List<TypeSig> GetArgs(IMethod method) {
|
|
var sig = method.MethodSig;
|
|
var args = new List<TypeSig>(sig.Params.Count + 1);
|
|
if (sig.ImplicitThis)
|
|
args.Add(method.DeclaringType.ToTypeSig());
|
|
foreach (var arg in sig.Params)
|
|
args.Add(arg);
|
|
return args;
|
|
}
|
|
|
|
public static int GetArgsCount(IMethod method) {
|
|
var sig = method.MethodSig;
|
|
if (sig == null)
|
|
return 0;
|
|
int count = sig.Params.Count;
|
|
if (sig.ImplicitThis)
|
|
count++;
|
|
return count;
|
|
}
|
|
|
|
public static IList<TypeSig> ReplaceGenericParameters(GenericInstSig typeOwner, MethodSpec methodOwner, IList<TypeSig> types) {
|
|
if (typeOwner == null && methodOwner == null)
|
|
return types;
|
|
for (int i = 0; i < types.Count; i++)
|
|
types[i] = GetGenericArgument(typeOwner, methodOwner, types[i]);
|
|
return types;
|
|
}
|
|
|
|
public static TypeSig GetGenericArgument(GenericInstSig typeOwner, MethodSpec methodOwner, TypeSig type) {
|
|
var typeArgs = typeOwner == null ? null : typeOwner.GenericArguments;
|
|
var genMethodArgs = methodOwner == null || methodOwner.GenericInstMethodSig == null ?
|
|
null : methodOwner.GenericInstMethodSig.GenericArguments;
|
|
return GenericArgsSubstitutor.Create(type, typeArgs, genMethodArgs);
|
|
}
|
|
|
|
public static Instruction GetInstruction(IList<Instruction> instructions, ref int index) {
|
|
for (int i = 0; i < 10; i++) {
|
|
if (index < 0 || index >= instructions.Count)
|
|
return null;
|
|
var instr = instructions[index++];
|
|
if (instr.OpCode.Code == Code.Nop)
|
|
continue;
|
|
if (instr.OpCode.OpCodeType == OpCodeType.Prefix)
|
|
continue;
|
|
if (instr == null || (instr.OpCode.Code != Code.Br && instr.OpCode.Code != Code.Br_S))
|
|
return instr;
|
|
instr = instr.Operand as Instruction;
|
|
if (instr == null)
|
|
return null;
|
|
index = instructions.IndexOf(instr);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public static TypeDefOrRefSig FindOrCreateTypeRef(ModuleDef module, AssemblyRef asmRef, string ns, string name, bool isValueType) {
|
|
var typeRef = module.UpdateRowId(new TypeRefUser(module, ns, name, asmRef));
|
|
if (isValueType)
|
|
return new ValueTypeSig(typeRef);
|
|
else
|
|
return new ClassSig(typeRef);
|
|
}
|
|
|
|
public static FrameworkType GetFrameworkType(ModuleDefMD module) {
|
|
foreach (var modRef in module.GetAssemblyRefs()) {
|
|
if (modRef.Name != "mscorlib")
|
|
continue;
|
|
if (PublicKeyBase.IsNullOrEmpty2(modRef.PublicKeyOrToken))
|
|
continue;
|
|
switch (BitConverter.ToString(modRef.PublicKeyOrToken.Data).Replace("-", "").ToLowerInvariant()) {
|
|
case "b77a5c561934e089":
|
|
return FrameworkType.Desktop;
|
|
case "7cec85d7bea7798e":
|
|
return FrameworkType.Silverlight;
|
|
case "969db8053d3322ac":
|
|
return FrameworkType.CompactFramework;
|
|
case "1c9e259686f921e0":
|
|
return FrameworkType.XNA;
|
|
case "e92a8b81eba7ceb7":
|
|
return FrameworkType.Zune;
|
|
}
|
|
}
|
|
|
|
return FrameworkType.Unknown;
|
|
}
|
|
|
|
public static int GetMethodCalls(MethodDef method, string methodFullName) {
|
|
if (method == null || method.Body == null)
|
|
return 0;
|
|
|
|
int count = 0;
|
|
foreach (var instr in method.Body.Instructions) {
|
|
if (instr.OpCode.Code != Code.Call && instr.OpCode.Code != Code.Callvirt && instr.OpCode.Code != Code.Newobj)
|
|
continue;
|
|
var calledMethod = instr.Operand as IMethod;
|
|
if (calledMethod == null)
|
|
continue;
|
|
if (calledMethod.FullName == methodFullName)
|
|
count++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
public static bool CallsMethod(MethodDef method, string methodFullName) {
|
|
if (method == null || method.Body == null)
|
|
return false;
|
|
|
|
foreach (var instr in method.Body.Instructions) {
|
|
if (instr.OpCode.Code != Code.Call && instr.OpCode.Code != Code.Callvirt && instr.OpCode.Code != Code.Newobj)
|
|
continue;
|
|
var calledMethod = instr.Operand as IMethod;
|
|
if (calledMethod == null)
|
|
continue;
|
|
if (calledMethod.FullName == methodFullName)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public static bool CallsMethod(MethodDef method, string returnType, string parameters) {
|
|
if (method == null || method.Body == null)
|
|
return false;
|
|
|
|
foreach (var instr in method.Body.Instructions) {
|
|
if (instr.OpCode.Code != Code.Call && instr.OpCode.Code != Code.Callvirt && instr.OpCode.Code != Code.Newobj)
|
|
continue;
|
|
if (IsMethod(instr.Operand as IMethod, returnType, parameters))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public static IList<Instruction> GetArgPushes(IList<Instruction> instrs, int index) {
|
|
return GetArgPushes(instrs, ref index);
|
|
}
|
|
|
|
public static IList<Instruction> GetArgPushes(IList<Instruction> instrs, ref int index) {
|
|
if (index < 0 || index >= instrs.Count)
|
|
return null;
|
|
var startInstr = instrs[index];
|
|
int pushes, pops;
|
|
startInstr.CalculateStackUsage(false, out pushes, out pops);
|
|
|
|
index--;
|
|
int numArgs = pops;
|
|
var args = new List<Instruction>(numArgs);
|
|
int stackSize = numArgs;
|
|
while (index >= 0 && args.Count != numArgs) {
|
|
var instr = instrs[index--];
|
|
instr.CalculateStackUsage(false, out pushes, out pops);
|
|
if (instr.OpCode.Code == Code.Dup) {
|
|
args.Add(instr);
|
|
stackSize--;
|
|
}
|
|
else {
|
|
if (pushes == 1)
|
|
args.Add(instr);
|
|
else if (pushes > 1)
|
|
throw new NotImplementedException();
|
|
stackSize -= pushes;
|
|
|
|
if (pops != 0) {
|
|
index++;
|
|
if (GetArgPushes(instrs, ref index) == null)
|
|
return null;
|
|
}
|
|
}
|
|
|
|
if (stackSize < 0)
|
|
return null;
|
|
}
|
|
if (args.Count != numArgs)
|
|
return null;
|
|
args.Reverse();
|
|
return args;
|
|
}
|
|
}
|
|
}
|