public DllContext(string filePath, bool runHash = true)
{
DLLPath = filePath;
if (!File.Exists(DLLPath))
{
Console.WriteLine($"{DLLPath}: File does not exist");
return;
}
FileName = Path.GetFileName(filePath);
// Compute and store the file hash
if (runHash)
{
using (var cryptoProvider = new SHA1CryptoServiceProvider())
{
SHA1Hash = BitConverter.ToString(cryptoProvider.ComputeHash(File.ReadAllBytes(filePath))).Replace("-", "");
}
}
// Get the module's exports
DllExports = UnmanagedUtility.GetExports(DLLPath);
if (DllExports.Count == 0)
{
Console.WriteLine($"{DLLPath}: No exports, possibly an invalid DLL");
return;
}
// Try to load the library into our process space
dllHandle = UnmanagedUtility.LoadLibrary(filePath);
if (dllHandle == IntPtr.Zero)
{
Console.WriteLine($"{DLLPath}: LoadLibrary failed");
return;
}
// Try to load addresses of all known exports
dllAddressMappings = new Dictionary <string, IntPtr>();
foreach (string knownExport in ExportDefinition.KnownExportedFunctions)
{
if (DllExports.Contains(knownExport))
{
dllAddressMappings.Add(knownExport, UnmanagedUtility.GetProcAddress(dllHandle, knownExport));
}
else
{
dllAddressMappings.Add(knownExport, IntPtr.Zero);
}
}
// Set capabilities
KeyGenerationCapability = DllExports.Contains("GenerateKeyEx") || DllExports.Contains("GenerateKeyExOpt");
ModeSpecified = DllExports.Contains("GetKeyLength") && DllExports.Contains("GetSeedLength") && DllExports.Contains("GetConfiguredAccessTypes");
// Store additional metadata
FileDescription = FileVersionInfo.GetVersionInfo(DLLPath).FileDescription;
LoadAdditionalDataFromDllCalls();
}
public void UnloadLibrary()
{
// WARNING: the instance will no longer be able to access native functions after this is called
// This is a workaround if many DLLs have to be enumerated for their metadata -- Windows has a limit on the number of DLLs that can be loaded simultaneously
UnmanagedUtility.FreeLibrary(dllHandle);
}