2012-02-03 19:43:24 +08:00
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/*
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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 de4dot.blocks;
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namespace de4dot.code.deobfuscators.Spices_Net {
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class ResourceNamesRestorer {
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ModuleDefinition module;
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TypeDefinition resourceManagerType;
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TypeDefinition componentResourceManagerType;
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MethodDefinitionAndDeclaringTypeDict<MethodReference> resourceManagerCtors = new MethodDefinitionAndDeclaringTypeDict<MethodReference>();
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MethodDefinitionAndDeclaringTypeDict<MethodReference> componentManagerCtors = new MethodDefinitionAndDeclaringTypeDict<MethodReference>();
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public TypeDefinition ResourceManagerType {
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get { return resourceManagerType; }
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}
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public TypeDefinition ComponentResourceManagerType {
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get { return componentResourceManagerType; }
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}
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public ResourceNamesRestorer(ModuleDefinition module) {
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this.module = module;
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}
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public void find() {
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foreach (var type in module.Types) {
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if (isResourceType(type, "System.Resources.ResourceManager"))
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resourceManagerType = type;
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else if (isResourceType(type, "System.ComponentModel.ComponentResourceManager"))
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componentResourceManagerType = type;
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}
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initializeCtors(resourceManagerType, resourceManagerCtors);
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initializeCtors(componentResourceManagerType, componentManagerCtors);
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}
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static void initializeCtors(TypeDefinition manager, MethodDefinitionAndDeclaringTypeDict<MethodReference> ctors) {
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if (manager == null)
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return;
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foreach (var ctor in manager.Methods) {
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if (ctor.Name != ".ctor")
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continue;
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var newCtor = new MethodReference(ctor.Name, ctor.MethodReturnType.ReturnType, manager.BaseType);
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newCtor.HasThis = true;
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foreach (var param in ctor.Parameters)
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newCtor.Parameters.Add(new ParameterDefinition(param.ParameterType));
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ctors.add(ctor, newCtor);
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}
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}
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static bool isResourceType(TypeDefinition type, string baseTypeName) {
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if (type.BaseType == null || type.BaseType.FullName != baseTypeName)
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return false;
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if (type.HasProperties || type.HasEvents || type.HasFields)
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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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var method = DotNetUtils.getMethod(type, "GetResourceFileName");
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if (!DotNetUtils.isMethod(method, "System.String", "(System.Globalization.CultureInfo)"))
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return false;
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return true;
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}
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public void renameResources() {
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if (resourceManagerType == null && componentResourceManagerType == null)
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return;
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var numToResource = new Dictionary<uint, Resource>(module.Resources.Count);
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foreach (var resource in module.Resources) {
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var name = resource.Name;
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int index = name.LastIndexOf('.');
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string ext;
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if (index < 0)
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ext = name;
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else
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ext = name.Substring(index + 1);
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uint extNum;
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if (!uint.TryParse(ext, out extNum))
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continue;
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numToResource[extNum] = resource;
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}
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foreach (var type in module.GetTypes()) {
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rename(numToResource, "", type.FullName);
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2012-03-18 05:12:51 +08:00
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rename(numToResource, "", type.FullName + ".g");
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2012-02-03 19:43:24 +08:00
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rename(numToResource, type.Namespace, type.Name);
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2012-03-18 05:12:51 +08:00
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rename(numToResource, type.Namespace, type.Name + ".g");
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2012-02-03 19:43:24 +08:00
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}
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2012-03-18 05:12:51 +08:00
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if (module.Assembly != null)
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rename(numToResource, "", module.Assembly.Name.Name + ".g");
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2012-02-03 19:43:24 +08:00
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}
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static void rename(Dictionary<uint, Resource> numToResource, string ns, string name) {
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var resourceName = name + ".resources";
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uint hash = getResourceHash(resourceName);
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Resource resource;
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if (!numToResource.TryGetValue(hash, out resource))
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return;
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int index = resource.Name.LastIndexOf('.');
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string resourceNamespace, newName;
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if (index < 0) {
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resourceNamespace = "";
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newName = resourceName;
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}
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else {
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resourceNamespace = resource.Name.Substring(0, index);
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newName = resourceNamespace + "." + resourceName;
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}
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if (resourceNamespace != ns)
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return;
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2012-02-03 21:35:42 +08:00
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Log.v("Restoring resource name: '{0}' => '{1}'",
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Utils.removeNewlines(resource.Name),
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Utils.removeNewlines(newName));
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2012-02-03 19:43:24 +08:00
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resource.Name = newName;
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numToResource.Remove(hash);
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}
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static uint getResourceHash(string name) {
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uint hash = 0;
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foreach (var c in name)
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hash = ror(hash ^ c, 1);
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return hash;
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}
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static uint ror(uint val, int n) {
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return (val << (32 - n)) + (val >> n);
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}
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public void deobfuscate(Blocks blocks) {
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foreach (var block in blocks.MethodBlocks.getAllBlocks()) {
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var instrs = block.Instructions;
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for (int i = 0; i < instrs.Count; i++) {
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var instr = instrs[i];
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if (instr.OpCode.Code != Code.Newobj)
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continue;
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var ctor = instr.Operand as MethodReference;
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if (ctor == null)
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continue;
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var newCtor = resourceManagerCtors.find(ctor);
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if (newCtor == null)
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newCtor = componentManagerCtors.find(ctor);
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if (newCtor == null)
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continue;
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instr.Operand = newCtor;
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}
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}
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}
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}
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}
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