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205 lines (184 loc) · 4.99 KB
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using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace BinaryNinja
{
internal static partial class NativeDelegates
{
[UnmanagedFunctionPointer(System.Runtime.InteropServices.CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.I1)]
internal delegate bool BNRecognizeLowLevelIL(
IntPtr context,
IntPtr view,
IntPtr function,
IntPtr il
);
[UnmanagedFunctionPointer(System.Runtime.InteropServices.CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.I1)]
internal delegate bool BNRecognizeMediumLevelIL(
IntPtr context,
IntPtr view,
IntPtr function,
IntPtr il
);
}
[StructLayout(LayoutKind.Sequential)]
internal struct BNFunctionRecognizer
{
internal IntPtr context;
internal IntPtr recognizeLowLevelIL;
internal IntPtr recognizeMediumLevelIL;
}
/// <summary>Recognizes known functions from their low- and medium-level IL.</summary>
public class FunctionRecognizer
{
private static readonly object registrationLock = new object();
private static readonly List<FunctionRecognizer> registeredRecognizers =
new List<FunctionRecognizer>();
private readonly NativeDelegates.BNRecognizeLowLevelIL lowLevelCallback;
private readonly NativeDelegates.BNRecognizeMediumLevelIL mediumLevelCallback;
private bool isGloballyRegistered;
/// <summary>Creates an unregistered function recognizer.</summary>
public FunctionRecognizer()
{
this.lowLevelCallback = new NativeDelegates.BNRecognizeLowLevelIL(
this.InvokeRecognizeLowLevelIL
);
this.mediumLevelCallback = new NativeDelegates.BNRecognizeMediumLevelIL(
this.InvokeRecognizeMediumLevelIL
);
}
/// <summary>Registers this recognizer for every architecture.</summary>
public void RegisterGlobal()
{
if (this.isGloballyRegistered)
{
throw new InvalidOperationException(
"The function recognizer is already registered globally."
);
}
BNFunctionRecognizer callbacks = this.CreateCallbacks();
NativeMethods.BNRegisterGlobalFunctionRecognizer(in callbacks);
this.isGloballyRegistered = true;
this.RootForRegistration();
}
/// <summary>Registers this recognizer for a specific architecture.</summary>
public void RegisterArchitecture(Architecture architecture)
{
if (null == architecture)
{
throw new ArgumentNullException(nameof(architecture));
}
BNFunctionRecognizer callbacks = this.CreateCallbacks();
NativeMethods.BNRegisterArchitectureFunctionRecognizer(
architecture.DangerousGetHandle(),
in callbacks
);
this.RootForRegistration();
}
/// <summary>Attempts recognition from low-level IL.</summary>
public virtual bool RecognizeLowLevelIL(
BinaryView view,
Function function,
LowLevelILFunction il
)
{
return false;
}
/// <summary>Attempts recognition from medium-level IL.</summary>
public virtual bool RecognizeMediumLevelIL(
BinaryView view,
Function function,
MediumLevelILFunction il
)
{
return false;
}
private BNFunctionRecognizer CreateCallbacks()
{
BNFunctionRecognizer callbacks = new BNFunctionRecognizer();
callbacks.context = IntPtr.Zero;
callbacks.recognizeLowLevelIL = Marshal.GetFunctionPointerForDelegate(
this.lowLevelCallback
);
callbacks.recognizeMediumLevelIL = Marshal.GetFunctionPointerForDelegate(
this.mediumLevelCallback
);
return callbacks;
}
private void RootForRegistration()
{
lock (FunctionRecognizer.registrationLock)
{
if (!FunctionRecognizer.registeredRecognizers.Contains(this))
{
FunctionRecognizer.registeredRecognizers.Add(this);
}
}
}
private bool InvokeRecognizeLowLevelIL(
IntPtr context,
IntPtr view,
IntPtr function,
IntPtr il
)
{
try
{
using (BinaryView managedView = BinaryView.MustTakeHandle(
NativeMethods.BNNewViewReference(view)
))
using (Function managedFunction = Function.MustNewFromHandle(function))
using (LowLevelILFunction managedIL =
LowLevelILFunction.MustNewFromHandle(il))
{
return this.RecognizeLowLevelIL(
managedView,
managedFunction,
managedIL
);
}
}
catch (Exception exception)
{
Core.LogError(
"Unhandled exception in FunctionRecognizer.RecognizeLowLevelIL: {0}",
exception
);
return false;
}
}
private bool InvokeRecognizeMediumLevelIL(
IntPtr context,
IntPtr view,
IntPtr function,
IntPtr il
)
{
try
{
using (BinaryView managedView = BinaryView.MustTakeHandle(
NativeMethods.BNNewViewReference(view)
))
using (Function managedFunction = Function.MustNewFromHandle(function))
using (MediumLevelILFunction managedIL =
MediumLevelILFunction.MustNewFromHandle(il))
{
return this.RecognizeMediumLevelIL(
managedView,
managedFunction,
managedIL
);
}
}
catch (Exception exception)
{
Core.LogError(
"Unhandled exception in FunctionRecognizer.RecognizeMediumLevelIL: {0}",
exception
);
return false;
}
}
}
}