163 lines
4.4 KiB
C#
163 lines
4.4 KiB
C#
/*
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Copyright (C) 2011-2014 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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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Agile_NET.vm.v1 {
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class UnknownHandlerInfo {
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TypeDef type;
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CsvmInfo csvmInfo;
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FieldsInfo fieldsInfo;
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MethodDef readMethod, executeMethod;
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int numStaticMethods, numInstanceMethods, numVirtualMethods, numCtors;
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int executeMethodThrows, executeMethodPops;
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public MethodDef ReadMethod {
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get { return readMethod; }
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}
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public MethodDef ExecuteMethod {
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get { return executeMethod; }
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}
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public int NumStaticMethods {
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get { return numStaticMethods; }
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}
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public int NumInstanceMethods {
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get { return numInstanceMethods; }
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}
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public int NumVirtualMethods {
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get { return numVirtualMethods; }
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}
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public int ExecuteMethodThrows {
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get { return executeMethodThrows; }
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}
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public int ExecuteMethodPops {
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get { return executeMethodPops; }
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}
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public int NumCtors {
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get { return numCtors; }
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}
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public UnknownHandlerInfo(TypeDef type, CsvmInfo csvmInfo) {
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this.type = type;
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this.csvmInfo = csvmInfo;
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fieldsInfo = new FieldsInfo(GetFields(type));
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CountMethods();
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FindOverrideMethods();
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executeMethodThrows = CountThrows(executeMethod);
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executeMethodPops = CountPops(executeMethod);
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}
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static internal IEnumerable<FieldDef> GetFields(TypeDef type) {
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var typeFields = new FieldDefAndDeclaringTypeDict<FieldDef>();
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foreach (var field in type.Fields)
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typeFields.Add(field, field);
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var realFields = new Dictionary<FieldDef, bool>();
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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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foreach (var instr in method.Body.Instructions) {
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var fieldRef = instr.Operand as IField;
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if (fieldRef == null)
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continue;
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var field = typeFields.Find(fieldRef);
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if (field == null)
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continue;
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realFields[field] = true;
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}
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}
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return realFields.Keys;
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}
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void CountMethods() {
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foreach (var method in type.Methods) {
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if (method.Name == ".cctor") {
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}
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else if (method.Name == ".ctor")
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numCtors++;
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else if (method.IsStatic)
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numStaticMethods++;
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else if (method.IsVirtual)
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numVirtualMethods++;
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else
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numInstanceMethods++;
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}
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}
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void FindOverrideMethods() {
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foreach (var method in type.Methods) {
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if (!method.IsVirtual)
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continue;
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if (DotNetUtils.IsMethod(method, "System.Void", "(System.IO.BinaryReader)")) {
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if (readMethod != null)
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throw new ApplicationException("Found another read method");
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readMethod = method;
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}
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else if (!DotNetUtils.HasReturnValue(method) && method.MethodSig.GetParamCount() == 1) {
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if (executeMethod != null)
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throw new ApplicationException("Found another execute method");
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executeMethod = method;
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}
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}
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if (readMethod == null)
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throw new ApplicationException("Could not find read method");
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if (executeMethod == null)
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throw new ApplicationException("Could not find execute method");
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}
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static int CountThrows(MethodDef method) {
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int count = 0;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code == Code.Throw)
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count++;
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}
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return count;
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}
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int CountPops(MethodDef method) {
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int count = 0;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Call && instr.OpCode.Code != Code.Callvirt)
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continue;
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var calledMethod = instr.Operand as IMethod;
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if (!MethodEqualityComparer.CompareDeclaringTypes.Equals(calledMethod, csvmInfo.PopMethod))
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continue;
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count++;
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}
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return count;
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}
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public bool HasSameFieldTypes(object[] fieldTypes) {
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return new FieldsInfo(fieldTypes).IsSame(fieldsInfo);
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}
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}
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}
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