760 lines
19 KiB
C#
760 lines
19 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 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 {
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public class ConstantsReader {
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protected IInstructions instructions;
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protected IList<Local> locals;
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protected Dictionary<Local, int> localsValuesInt32 = new Dictionary<Local, int>();
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protected Dictionary<Local, long> localsValuesInt64 = new Dictionary<Local, long>();
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protected Dictionary<Local, double> localsValuesDouble = new Dictionary<Local, double>();
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bool emulateConvInstrs;
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public IEnumerable<KeyValuePair<Local, int>> Locals32 {
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get { return localsValuesInt32; }
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}
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public IEnumerable<KeyValuePair<Local, long>> Locals64 {
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get { return localsValuesInt64; }
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}
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public IEnumerable<KeyValuePair<Local, double>> LocalsDouble {
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get { return localsValuesDouble; }
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}
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public interface IInstructions {
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int Count { get; }
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Instruction this[int index] { get; }
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}
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class ListInstructions : IInstructions {
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IList<Instruction> instrs;
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public int Count {
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get { return instrs.Count; }
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}
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public Instruction this[int index] {
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get { return instrs[index]; }
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}
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public ListInstructions(IList<Instruction> instrs) {
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this.instrs = instrs;
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}
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}
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class ListInstrs : IInstructions {
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IList<Instr> instrs;
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public int Count {
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get { return instrs.Count; }
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}
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public Instruction this[int index] {
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get { return instrs[index].Instruction; }
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}
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public ListInstrs(IList<Instr> instrs) {
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this.instrs = instrs;
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}
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}
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public bool EmulateConvInstructions {
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get { return emulateConvInstrs; }
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set { emulateConvInstrs = value; }
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}
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ConstantsReader(IInstructions instructions)
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: this(instructions, true) {
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}
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ConstantsReader(IInstructions instructions, bool emulateConvInstrs) {
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this.instructions = instructions;
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this.emulateConvInstrs = emulateConvInstrs;
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}
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public ConstantsReader(IList<Instruction> instrs)
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: this(new ListInstructions(instrs)) {
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}
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public ConstantsReader(IList<Instruction> instrs, bool emulateConvInstrs)
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: this(new ListInstructions(instrs), emulateConvInstrs) {
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}
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public ConstantsReader(IList<Instr> instrs)
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: this(new ListInstrs(instrs)) {
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}
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public ConstantsReader(IList<Instr> instrs, bool emulateConvInstrs)
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: this(new ListInstrs(instrs), emulateConvInstrs) {
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}
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public ConstantsReader(MethodDef method)
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: this(method.Body.Instructions) {
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this.locals = method.Body.Variables;
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}
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public ConstantsReader(IList<Instr> instrs, IList<Local> locals)
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: this(instrs) {
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this.locals = locals;
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}
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public void SetConstantInt32(Local local, int value) {
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localsValuesInt32[local] = value;
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}
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public void SetConstantInt32(Local local, uint value) {
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SetConstantInt32(local, (int)value);
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}
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public void SetConstantInt64(Local local, long value) {
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localsValuesInt64[local] = value;
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}
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public void SetConstantInt64(Local local, ulong value) {
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SetConstantInt64(local, (long)value);
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}
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public void SetConstantDouble(Local local, double value) {
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localsValuesDouble[local] = value;
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}
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public bool GetNextInt32(ref int index, out int val) {
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for (; index < instructions.Count; index++) {
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var instr = instructions[index];
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if (!IsLoadConstantInt32(instr))
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continue;
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return GetInt32(ref index, out val);
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}
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val = 0;
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return false;
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}
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public bool IsLoadConstantInt32(Instruction instr) {
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if (instr.IsLdcI4())
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return true;
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if (instr.IsLdloc()) {
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int tmp;
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return GetLocalConstantInt32(instr, out tmp);
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}
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if (instr.IsLdarg()) {
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int tmp;
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return GetArgConstantInt32(instr, out tmp);
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}
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return false;
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}
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public bool IsLoadConstantInt64(Instruction instr) {
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if (instr.OpCode.Code == Code.Ldc_I8)
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return true;
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if (instr.IsLdloc()) {
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long tmp;
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return GetLocalConstantInt64(instr, out tmp);
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}
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if (instr.IsLdarg()) {
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long tmp;
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return GetArgConstantInt64(instr, out tmp);
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}
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return false;
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}
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public bool IsLoadConstantDouble(Instruction instr) {
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if (instr.OpCode.Code == Code.Ldc_R8)
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return true;
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if (instr.IsLdloc()) {
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double tmp;
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return GetLocalConstantDouble(instr, out tmp);
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}
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if (instr.IsLdarg()) {
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double tmp;
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return GetArgConstantDouble(instr, out tmp);
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}
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return false;
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}
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public bool GetInt16(ref int index, out short val) {
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int tmp;
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if (!GetInt32(ref index, out tmp)) {
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val = 0;
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return false;
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}
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val = (short)tmp;
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return true;
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}
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protected struct ConstantInfo<T> {
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public int index;
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public T constant;
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public ConstantInfo(int index, T constant) {
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this.index = index;
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this.constant = constant;
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}
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}
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protected virtual bool ProcessInstructionInt32(ref int index, Stack<ConstantInfo<int>> stack) {
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return false;
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}
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protected virtual bool ProcessInstructionInt64(ref int index, Stack<ConstantInfo<long>> stack) {
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return false;
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}
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protected virtual bool ProcessInstructionDouble(ref int index, Stack<ConstantInfo<double>> stack) {
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return false;
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}
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public bool GetInt32(ref int index, out int val) {
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val = 0;
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if (index >= instructions.Count)
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return false;
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var stack = new Stack<ConstantInfo<int>>();
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int op1;
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ConstantInfo<int> info1, info2;
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for (; index < instructions.Count; index++) {
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if (ProcessInstructionInt32(ref index, stack)) {
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index--;
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continue;
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}
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var instr = instructions[index];
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switch (instr.OpCode.Code) {
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case Code.Conv_I1:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<int>(index, (sbyte)stack.Pop().constant));
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break;
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case Code.Conv_U1:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<int>(index, (byte)stack.Pop().constant));
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break;
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case Code.Conv_I2:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<int>(index, (short)stack.Pop().constant));
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break;
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case Code.Conv_U2:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<int>(index, (ushort)stack.Pop().constant));
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break;
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case Code.Conv_I4:
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case Code.Conv_U4:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<int>(index, stack.Pop().constant));
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break;
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case Code.Not:
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if (stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<int>(index, ~stack.Pop().constant));
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break;
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case Code.Neg:
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if (stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<int>(index, -stack.Pop().constant));
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break;
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case Code.Ldloc:
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case Code.Ldloc_S:
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case Code.Ldloc_0:
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case Code.Ldloc_1:
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case Code.Ldloc_2:
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case Code.Ldloc_3:
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if (!GetLocalConstantInt32(instr, out op1))
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goto done;
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stack.Push(new ConstantInfo<int>(index, op1));
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break;
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case Code.Ldarg:
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case Code.Ldarg_S:
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case Code.Ldarg_0:
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case Code.Ldarg_1:
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case Code.Ldarg_2:
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case Code.Ldarg_3:
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if (!GetArgConstantInt32(instr, out op1))
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goto done;
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stack.Push(new ConstantInfo<int>(index, op1));
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break;
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case Code.Ldc_I4:
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case Code.Ldc_I4_S:
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case Code.Ldc_I4_0:
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case Code.Ldc_I4_1:
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case Code.Ldc_I4_2:
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case Code.Ldc_I4_3:
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case Code.Ldc_I4_4:
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case Code.Ldc_I4_5:
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case Code.Ldc_I4_6:
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case Code.Ldc_I4_7:
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case Code.Ldc_I4_8:
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case Code.Ldc_I4_M1:
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stack.Push(new ConstantInfo<int>(index, instr.GetLdcI4Value()));
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break;
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case Code.Add:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<int>(index, info1.constant + info2.constant));
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break;
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case Code.Sub:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<int>(index, info1.constant - info2.constant));
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break;
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case Code.Xor:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<int>(index, info1.constant ^ info2.constant));
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break;
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case Code.Or:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<int>(index, info1.constant | info2.constant));
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break;
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case Code.And:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<int>(index, info1.constant & info2.constant));
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break;
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case Code.Mul:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<int>(index, info1.constant * info2.constant));
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break;
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case Code.Div:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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if (info2.constant == 0)
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goto done;
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<int>(index, info1.constant / info2.constant));
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break;
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case Code.Div_Un:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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if (info2.constant == 0)
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goto done;
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<int>(index, (int)((uint)info1.constant / (uint)info2.constant)));
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break;
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default:
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goto done;
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}
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}
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done:
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if (stack.Count == 0)
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return false;
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while (stack.Count > 1)
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stack.Pop();
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info1 = stack.Pop();
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index = info1.index + 1;
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val = info1.constant;
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return true;
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}
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public bool GetInt64(ref int index, out long val) {
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val = 0;
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if (index >= instructions.Count)
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return false;
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var stack = new Stack<ConstantInfo<long>>();
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long op1;
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ConstantInfo<long> info1, info2;
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for (; index < instructions.Count; index++) {
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if (ProcessInstructionInt64(ref index, stack)) {
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index--;
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continue;
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}
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var instr = instructions[index];
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switch (instr.OpCode.Code) {
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case Code.Conv_I1:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, (sbyte)stack.Pop().constant));
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break;
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case Code.Conv_U1:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, (byte)stack.Pop().constant));
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break;
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case Code.Conv_I2:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, (short)stack.Pop().constant));
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break;
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case Code.Conv_U2:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, (ushort)stack.Pop().constant));
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break;
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case Code.Conv_I4:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, (int)stack.Pop().constant));
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break;
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case Code.Conv_U4:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, (uint)stack.Pop().constant));
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break;
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case Code.Conv_I8:
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case Code.Conv_U8:
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if (!emulateConvInstrs || stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, stack.Pop().constant));
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break;
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case Code.Not:
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if (stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, ~stack.Pop().constant));
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break;
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case Code.Neg:
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if (stack.Count < 1)
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goto done;
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stack.Push(new ConstantInfo<long>(index, -stack.Pop().constant));
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break;
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case Code.Ldloc:
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case Code.Ldloc_S:
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case Code.Ldloc_0:
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case Code.Ldloc_1:
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case Code.Ldloc_2:
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case Code.Ldloc_3:
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if (!GetLocalConstantInt64(instr, out op1))
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goto done;
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stack.Push(new ConstantInfo<long>(index, op1));
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break;
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case Code.Ldarg:
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case Code.Ldarg_S:
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case Code.Ldarg_0:
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case Code.Ldarg_1:
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case Code.Ldarg_2:
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case Code.Ldarg_3:
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if (!GetArgConstantInt64(instr, out op1))
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goto done;
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stack.Push(new ConstantInfo<long>(index, op1));
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break;
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case Code.Ldc_I8:
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stack.Push(new ConstantInfo<long>(index, (long)instr.Operand));
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break;
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case Code.Add:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<long>(index, info1.constant + info2.constant));
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break;
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case Code.Sub:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<long>(index, info1.constant - info2.constant));
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break;
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case Code.Xor:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<long>(index, info1.constant ^ info2.constant));
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break;
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case Code.Or:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<long>(index, info1.constant | info2.constant));
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break;
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case Code.And:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<long>(index, info1.constant & info2.constant));
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break;
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case Code.Mul:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<long>(index, info1.constant * info2.constant));
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break;
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case Code.Div:
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if (stack.Count < 2)
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goto done;
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info2 = stack.Pop();
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if (info2.constant == 0)
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goto done;
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info1 = stack.Pop();
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stack.Push(new ConstantInfo<long>(index, info1.constant / info2.constant));
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break;
|
|
|
|
case Code.Div_Un:
|
|
if (stack.Count < 2)
|
|
goto done;
|
|
info2 = stack.Pop();
|
|
if (info2.constant == 0)
|
|
goto done;
|
|
info1 = stack.Pop();
|
|
stack.Push(new ConstantInfo<long>(index, (int)((uint)info1.constant / (uint)info2.constant)));
|
|
break;
|
|
|
|
default:
|
|
goto done;
|
|
}
|
|
}
|
|
done:
|
|
if (stack.Count == 0)
|
|
return false;
|
|
while (stack.Count > 1)
|
|
stack.Pop();
|
|
info1 = stack.Pop();
|
|
index = info1.index + 1;
|
|
val = info1.constant;
|
|
return true;
|
|
}
|
|
|
|
public bool GetDouble(ref int index, out double val) {
|
|
val = 0;
|
|
if (index >= instructions.Count)
|
|
return false;
|
|
|
|
var stack = new Stack<ConstantInfo<double>>();
|
|
|
|
double op1;
|
|
ConstantInfo<double> info1, info2;
|
|
for (; index < instructions.Count; index++) {
|
|
if (ProcessInstructionDouble(ref index, stack)) {
|
|
index--;
|
|
continue;
|
|
}
|
|
var instr = instructions[index];
|
|
switch (instr.OpCode.Code) {
|
|
case Code.Conv_R4:
|
|
if (!emulateConvInstrs || stack.Count < 1)
|
|
goto done;
|
|
stack.Push(new ConstantInfo<double>(index, (float)stack.Pop().constant));
|
|
break;
|
|
|
|
case Code.Conv_R8:
|
|
if (!emulateConvInstrs || stack.Count < 1)
|
|
goto done;
|
|
stack.Push(new ConstantInfo<double>(index, stack.Pop().constant));
|
|
break;
|
|
|
|
case Code.Neg:
|
|
if (stack.Count < 1)
|
|
goto done;
|
|
stack.Push(new ConstantInfo<double>(index, -stack.Pop().constant));
|
|
break;
|
|
|
|
case Code.Ldloc:
|
|
case Code.Ldloc_S:
|
|
case Code.Ldloc_0:
|
|
case Code.Ldloc_1:
|
|
case Code.Ldloc_2:
|
|
case Code.Ldloc_3:
|
|
if (!GetLocalConstantDouble(instr, out op1))
|
|
goto done;
|
|
stack.Push(new ConstantInfo<double>(index, op1));
|
|
break;
|
|
|
|
case Code.Ldarg:
|
|
case Code.Ldarg_S:
|
|
case Code.Ldarg_0:
|
|
case Code.Ldarg_1:
|
|
case Code.Ldarg_2:
|
|
case Code.Ldarg_3:
|
|
if (!GetArgConstantDouble(instr, out op1))
|
|
goto done;
|
|
stack.Push(new ConstantInfo<double>(index, op1));
|
|
break;
|
|
|
|
case Code.Ldc_R4:
|
|
stack.Push(new ConstantInfo<double>(index, (float)instr.Operand));
|
|
break;
|
|
|
|
case Code.Ldc_R8:
|
|
stack.Push(new ConstantInfo<double>(index, (double)instr.Operand));
|
|
break;
|
|
|
|
case Code.Add:
|
|
if (stack.Count < 2)
|
|
goto done;
|
|
info2 = stack.Pop();
|
|
info1 = stack.Pop();
|
|
stack.Push(new ConstantInfo<double>(index, info1.constant + info2.constant));
|
|
break;
|
|
|
|
case Code.Sub:
|
|
if (stack.Count < 2)
|
|
goto done;
|
|
info2 = stack.Pop();
|
|
info1 = stack.Pop();
|
|
stack.Push(new ConstantInfo<double>(index, info1.constant - info2.constant));
|
|
break;
|
|
|
|
case Code.Mul:
|
|
if (stack.Count < 2)
|
|
goto done;
|
|
info2 = stack.Pop();
|
|
info1 = stack.Pop();
|
|
stack.Push(new ConstantInfo<double>(index, info1.constant * info2.constant));
|
|
break;
|
|
|
|
case Code.Div:
|
|
if (stack.Count < 2)
|
|
goto done;
|
|
info2 = stack.Pop();
|
|
info1 = stack.Pop();
|
|
stack.Push(new ConstantInfo<double>(index, info1.constant / info2.constant));
|
|
break;
|
|
|
|
case Code.Div_Un:
|
|
if (stack.Count < 2)
|
|
goto done;
|
|
info2 = stack.Pop();
|
|
info1 = stack.Pop();
|
|
stack.Push(new ConstantInfo<double>(index, (int)((uint)info1.constant / (uint)info2.constant)));
|
|
break;
|
|
|
|
default:
|
|
goto done;
|
|
}
|
|
}
|
|
done:
|
|
if (stack.Count == 0)
|
|
return false;
|
|
while (stack.Count > 1)
|
|
stack.Pop();
|
|
info1 = stack.Pop();
|
|
index = info1.index + 1;
|
|
val = info1.constant;
|
|
return true;
|
|
}
|
|
|
|
protected virtual bool GetLocalConstantInt32(Instruction instr, out int value) {
|
|
value = 0;
|
|
if (locals == null)
|
|
return false;
|
|
var local = instr.GetLocal(locals);
|
|
if (local == null)
|
|
return false;
|
|
if (local.Type.ElementType != ElementType.I4 && local.Type.ElementType != ElementType.U4)
|
|
return false;
|
|
return localsValuesInt32.TryGetValue(local, out value);
|
|
}
|
|
|
|
protected virtual bool GetArgConstantInt32(Instruction instr, out int value) {
|
|
value = 0;
|
|
return false;
|
|
}
|
|
|
|
protected virtual bool GetLocalConstantInt64(Instruction instr, out long value) {
|
|
value = 0;
|
|
if (locals == null)
|
|
return false;
|
|
var local = instr.GetLocal(locals);
|
|
if (local == null)
|
|
return false;
|
|
if (local.Type.ElementType != ElementType.I8 && local.Type.ElementType != ElementType.U8)
|
|
return false;
|
|
return localsValuesInt64.TryGetValue(local, out value);
|
|
}
|
|
|
|
protected virtual bool GetArgConstantInt64(Instruction instr, out long value) {
|
|
value = 0;
|
|
return false;
|
|
}
|
|
|
|
protected virtual bool GetLocalConstantDouble(Instruction instr, out double value) {
|
|
value = 0;
|
|
if (locals == null)
|
|
return false;
|
|
var local = instr.GetLocal(locals);
|
|
if (local == null)
|
|
return false;
|
|
if (local.Type.ElementType != ElementType.R8)
|
|
return false;
|
|
return localsValuesDouble.TryGetValue(local, out value);
|
|
}
|
|
|
|
protected virtual bool GetArgConstantDouble(Instruction instr, out double value) {
|
|
value = 0;
|
|
return false;
|
|
}
|
|
}
|
|
}
|