85 lines
2.8 KiB
C#
85 lines
2.8 KiB
C#
using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using Obfuz.Utils;
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using Obfuz.Virtualization;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Threading.Tasks;
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using UnityEngine.Assertions;
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namespace Obfuz.DynamicProxy
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{
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public class ProxyCallPass : MethodBodyObfuscationPassBase
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{
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private readonly IRandom _random;
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private readonly IProxyCallPolicy _dynamicProxyPolicy;
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private readonly IProxyCallObfuscator _dynamicProxyObfuscator;
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public ProxyCallPass()
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{
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_random = new RandomWithKey(new byte[] { 0x1, 0x2, 0x3, 0x4 }, 0x5);
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_dynamicProxyPolicy = new ConfigProxyCallPolicy();
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_dynamicProxyObfuscator = new DefaultProxyCallObfuscator(_random);
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}
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public override void Stop(ObfuscatorContext ctx)
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{
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_dynamicProxyObfuscator.Done();
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}
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public override void Start(ObfuscatorContext ctx)
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{
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}
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protected override bool NeedObfuscateMethod(MethodDef method)
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{
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return _dynamicProxyPolicy.NeedDynamicProxyCallInMethod(method);
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}
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protected override bool TryObfuscateInstruction(MethodDef method, Instruction inst, IList<Instruction> instructions, int instructionIndex,
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List<Instruction> outputInstructions, List<Instruction> totalFinalInstructions)
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{
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IMethod calledMethod = inst.Operand as IMethod;
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if (calledMethod == null || !calledMethod.IsMethod)
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{
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return false;
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}
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if (MetaUtil.ContainsContainsGenericParameter(calledMethod))
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{
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return false;
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}
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switch (inst.OpCode.Code)
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{
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case Code.Call:
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{
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if (!_dynamicProxyPolicy.NeedDynamicProxyCalledMethod(calledMethod, false))
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{
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return false;
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}
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_dynamicProxyObfuscator.Obfuscate(method, calledMethod, false, outputInstructions);
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return true;
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}
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case Code.Callvirt:
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{
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if (instructionIndex > 0 && instructions[instructionIndex - 1].OpCode.Code == Code.Constrained)
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{
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return false;
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}
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if (!_dynamicProxyPolicy.NeedDynamicProxyCalledMethod(calledMethod, true))
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{
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return false;
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}
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_dynamicProxyObfuscator.Obfuscate(method, calledMethod, true, outputInstructions);
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return true;
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}
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default: return false;
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}
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}
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}
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}
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