176 lines
4.8 KiB
C#
176 lines
4.8 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.Collections.Generic;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using Mono.Cecil.Metadata;
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using de4dot.blocks;
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using de4dot.blocks.cflow;
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namespace de4dot.code.deobfuscators.Spices_Net {
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class SpicesMethodCallInliner : MethodCallInliner {
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ModuleDefinition module;
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TypeDefinitionDict<bool> validTypes = new TypeDefinitionDict<bool>();
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public SpicesMethodCallInliner(ModuleDefinition module)
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: base(false) {
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this.module = module;
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}
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public bool checkCanInline(MethodDefinition method) {
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return validTypes.find(method.DeclaringType);
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}
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protected override bool canInline(MethodDefinition method) {
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return checkCanInline(method);
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}
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public void initialize() {
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foreach (var type in module.GetTypes()) {
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if (checkValidType(type))
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validTypes.add(type, true);
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}
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}
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static bool checkValidType(TypeDefinition type) {
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if ((type.Attributes & ~TypeAttributes.BeforeFieldInit) != TypeAttributes.NestedAssembly)
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return false;
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if (type.HasProperties || type.HasEvents || type.HasFields || type.HasNestedTypes)
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return false;
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if (type.GenericParameters.Count > 0)
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return false;
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if (type.IsValueType || type.IsInterface)
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return false;
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if (type.BaseType == null || type.BaseType.EType != ElementType.Object)
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return false;
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if (type.Interfaces.Count > 0)
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return false;
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if (!checkValidTypeMethods(type))
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return false;
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return true;
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}
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static bool checkValidTypeMethods(TypeDefinition type) {
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bool foundCtor = false;
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int numMethods = 0;
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foreach (var method in type.Methods) {
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if (method.Name == ".cctor")
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return false;
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if (method.Name == ".ctor") {
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if (method.Parameters.Count != 0)
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return false;
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foundCtor = true;
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continue;
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}
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if (method.Attributes != (MethodAttributes.Assembly | MethodAttributes.Static | MethodAttributes.HideBySig))
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return false;
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if (method.HasPInvokeInfo || method.PInvokeInfo != null)
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return false;
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if (method.GenericParameters.Count > 0)
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return false;
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numMethods++;
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}
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return numMethods > 0 && foundCtor;
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}
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public bool restoreBody(Blocks blocks) {
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if (validTypes.find(blocks.Method.DeclaringType))
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return false;
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if (blocks.Locals.Count > 0)
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return false;
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if (blocks.MethodBlocks.BaseBlocks.Count != 1)
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return false;
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var block = blocks.MethodBlocks.BaseBlocks[0] as Block;
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if (block == null)
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return false;
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MethodDefinition calledMethod;
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if (!checkRestoreBody(block, out calledMethod))
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return false;
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if (calledMethod == blocks.Method)
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return false;
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DotNetUtils.copyBodyFromTo(calledMethod, blocks.Method);
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blocks.updateBlocks();
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return true;
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}
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bool checkRestoreBody(Block block, out MethodDefinition calledMethod) {
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calledMethod = null;
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var instrs = block.Instructions;
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int index;
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for (index = 0; index < instrs.Count; index++) {
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if (DotNetUtils.getArgIndex(instrs[index].Instruction) != index)
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break;
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}
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var call = instrs[index++];
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if (call.OpCode.Code != Code.Call)
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return false;
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calledMethod = call.Operand as MethodDefinition;
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if (calledMethod == null)
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return false;
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if (!checkCanInline(calledMethod))
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return false;
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if (instrs[index++].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 List<MethodDefinition> getInlinedMethods() {
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var list = new List<MethodDefinition>();
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foreach (var type in validTypes.getKeys())
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list.AddRange(type.Methods);
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return list;
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}
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public TypeDefinitionDict<bool> getInlinedTypes(IEnumerable<MethodDefinition> unusedMethods) {
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var unused = new MethodDefinitionAndDeclaringTypeDict<bool>();
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foreach (var method in unusedMethods)
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unused.add(method, true);
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var types = new TypeDefinitionDict<bool>();
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foreach (var type in validTypes.getKeys()) {
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if (checkAllMethodsUnused(unused, type))
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types.add(type, true);
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}
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return types;
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}
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static bool checkAllMethodsUnused(MethodDefinitionAndDeclaringTypeDict<bool> unused, TypeDefinition type) {
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foreach (var method in type.Methods) {
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if (!unused.find(method))
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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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