103 lines
2.7 KiB
C#
103 lines
2.7 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 dnlib.DotNet;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.dotNET_Reactor.v4 {
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// Detect some empty class that is called from most .ctor's
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class EmptyClass {
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ModuleDefMD module;
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MethodDef emptyMethod;
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public MethodDef Method {
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get { return emptyMethod; }
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}
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public TypeDef Type {
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get { return emptyMethod != null ? emptyMethod.DeclaringType : null; }
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}
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public EmptyClass(ModuleDefMD module) {
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this.module = module;
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Initialize();
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}
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void Initialize() {
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var callCounter = new CallCounter();
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int count = 0;
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foreach (var type in module.GetTypes()) {
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if (count >= 40)
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break;
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foreach (var method in type.Methods) {
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if (method.Name != ".ctor" && method.Name != ".cctor" && module.EntryPoint != method)
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continue;
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foreach (var calledMethod in DotNetUtils.GetCalledMethods(module, method)) {
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if (!calledMethod.IsStatic || calledMethod.Body == null)
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continue;
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if (!DotNetUtils.IsMethod(calledMethod, "System.Void", "()"))
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continue;
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if (IsEmptyClass(calledMethod)) {
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callCounter.Add(calledMethod);
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count++;
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}
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}
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}
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}
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int numCalls;
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var theMethod = (MethodDef)callCounter.Most(out numCalls);
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if (numCalls >= 10)
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emptyMethod = theMethod;
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}
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bool IsEmptyClass(MethodDef emptyMethod) {
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if (!DotNetUtils.IsEmptyObfuscated(emptyMethod))
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return false;
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var type = emptyMethod.DeclaringType;
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if (type.HasEvents || type.HasProperties)
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return false;
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if (type.Fields.Count != 1)
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return false;
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if (type.Fields[0].FieldType.FullName != "System.Boolean")
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return false;
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if (type.IsPublic)
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return false;
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int otherMethods = 0;
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foreach (var method in type.Methods) {
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if (method.Name == ".ctor" || method.Name == ".cctor")
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continue;
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if (method == emptyMethod)
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continue;
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otherMethods++;
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if (method.Body == null)
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return false;
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if (method.Body.Instructions.Count > 20)
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return false;
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}
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if (otherMethods > 8)
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return false;
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return true;
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}
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}
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}
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