151 lines
4.4 KiB
C#
151 lines
4.4 KiB
C#
/*
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Copyright (C) 2011-2012 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 dot10.DotNet;
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using dot10.DotNet.Emit;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.SmartAssembly {
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class AutomatedErrorReportingFinder : ExceptionLoggerRemover {
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ModuleDefMD module;
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bool enabled;
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protected override bool HasExceptionLoggers {
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get { return enabled; }
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}
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public AutomatedErrorReportingFinder(ModuleDefMD module) {
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this.module = module;
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}
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protected override bool isExceptionLogger(IMethod method) {
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return isExceptionLoggerMethod(method);
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}
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public void find() {
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var entryPoint = module.EntryPoint;
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if (entryPoint == null)
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enabled = true;
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else {
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MethodDef exceptionMethod;
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enabled = checkMethod(entryPoint, out exceptionMethod);
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}
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}
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bool checkMethod(MethodDef method, out MethodDef exceptionMethod) {
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exceptionMethod = null;
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var body = method.Body;
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if (body == null)
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return false;
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var instrs = body.Instructions;
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if (instrs.Count < 1)
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return false;
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if (body.ExceptionHandlers.Count == 0)
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return false;
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var eh = body.ExceptionHandlers[body.ExceptionHandlers.Count - 1];
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if (eh.HandlerType != ExceptionHandlerType.Catch)
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return false;
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if (eh.FilterStart != null)
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return false;
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if (eh.CatchType == null || eh.CatchType.FullName != "System.Exception")
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return false;
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if (eh.HandlerStart == null)
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return false;
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int handlerStart = instrs.IndexOf(eh.HandlerStart);
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int handlerEnd = eh.HandlerEnd == null ? instrs.Count : instrs.IndexOf(eh.HandlerEnd);
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exceptionMethod = DotNetUtils.getMethod(module, checkHandler(instrs, handlerStart, handlerEnd));
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if (exceptionMethod == null || !exceptionMethod.IsStatic || exceptionMethod.Body == null)
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return false;
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return isExceptionLoggerMethod(exceptionMethod);
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}
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IMethod checkHandler(IList<Instruction> instrs, int start, int end) {
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IMethod calledMethod = null;
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for (int i = start; i < end; i++) {
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var instr = instrs[i];
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if (instr.OpCode.Code == Code.Call || instr.OpCode.Code == Code.Callvirt) {
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if (calledMethod != null)
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return null;
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var method = instr.Operand as IMethod;
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if (method == null)
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return null;
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calledMethod = method;
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}
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}
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return calledMethod;
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}
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static bool isExceptionLoggerMethod(IMethod method) {
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if (method.Name == ".ctor" || method.Name == ".cctor")
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return false;
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var sig = method.MethodSig;
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if (sig == null || sig.Params.Count < 1)
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return false;
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var rtype = sig.RetType.GetFullName();
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var type0 = sig.Params[0].GetFullName();
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var type1 = sig.Params.Count < 2 ? "" : sig.Params[1].GetFullName();
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int index;
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if (rtype == "System.Void") {
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if (type0 == "System.Exception" && type1 == "System.Int32")
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index = 2;
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else if (type0 == "System.Object[]" && type1 == "System.Exception")
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return true;
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else if (sig.Params.Count == 2 && type0 == "System.Int32" && type1 == "System.Object[]")
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return true;
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else if (type0 == "System.Exception")
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index = 1;
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else
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return false;
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}
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else if (rtype == "System.Exception") {
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if (type0 == "System.Exception" && type1 == "System.Int32")
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index = 2;
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else if (type0 == "System.Int32" && type1 == "System.Exception")
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index = 2;
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else if (sig.Params.Count == 2 && type0 == "System.Int32" && type1 == "System.Object[]")
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return true;
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else if (type0 == "System.Exception")
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index = 1;
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else
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return false;
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}
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else
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return false;
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if (index + 1 == sig.Params.Count && sig.Params[index].GetFullName() == "System.Object[]")
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return true;
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for (int i = index; i < sig.Params.Count; i++) {
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if (sig.Params[i].GetElementType() != ElementType.Object)
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return false;
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}
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return true;
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}
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}
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}
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