unsafe private static void EnumerateFiles(string volumeName, IntPtr pVolume, IntPtr medBuffer, Dictionary <ulong, USNRecord> files)
{
IntPtr pData = Marshal.AllocHGlobal(sizeof(UInt64) + 0x10000);
PInvokeWin32.ZeroMemory(pData, sizeof(UInt64) + 0x10000);
uint outBytesReturned = 0;
while (false != PInvokeWin32.DeviceIoControl(pVolume, PInvokeWin32.FSCTL_ENUM_USN_DATA, medBuffer,
sizeof(PInvokeWin32.MFT_ENUM_DATA), pData, sizeof(UInt64) + 0x10000, out outBytesReturned,
IntPtr.Zero))
{
IntPtr pUsnRecord = new IntPtr(pData.ToInt32() + sizeof(Int64));
while (outBytesReturned > 60)
{
PInvokeWin32.USN_RECORD usn = new PInvokeWin32.USN_RECORD(pUsnRecord);
files.Add(usn.FRN, new USNRecord
{
Name = usn.FileName,
ParentFrn = usn.ParentFRN,
FRN = usn.FRN,
IsFolder = usn.IsFolder,
VolumeName = volumeName
});
pUsnRecord = new IntPtr(pUsnRecord.ToInt32() + usn.RecordLength);
outBytesReturned -= usn.RecordLength;
}
Marshal.WriteInt64(medBuffer, Marshal.ReadInt64(pData, 0));
}
Marshal.FreeHGlobal(pData);
}
unsafe internal static bool QueryUSNJournal(IntPtr pVolume, out PInvokeWin32.USN_JOURNAL_DATA ujd, out uint bytesReturned)
{
bool bOK = PInvokeWin32.DeviceIoControl(
pVolume, PInvokeWin32.FSCTL_QUERY_USN_JOURNAL,
IntPtr.Zero,
0,
out ujd,
sizeof(PInvokeWin32.USN_JOURNAL_DATA),
out bytesReturned,
IntPtr.Zero
);
return(bOK);
}
private static void AddVolumeRootRecord(string volumeName, Dictionary <ulong, USNRecord> files)
{
string rightVolumeName = string.Concat("\\\\.\\", volumeName);
rightVolumeName = string.Concat(rightVolumeName, Path.DirectorySeparatorChar);
IntPtr hRoot = PInvokeWin32.CreateFile(rightVolumeName,
0,
PInvokeWin32.FILE_SHARE_READ | PInvokeWin32.FILE_SHARE_WRITE,
IntPtr.Zero,
PInvokeWin32.OPEN_EXISTING,
PInvokeWin32.FILE_FLAG_BACKUP_SEMANTICS,
IntPtr.Zero);
if (hRoot.ToInt32() != PInvokeWin32.INVALID_HANDLE_VALUE)
{
PInvokeWin32.BY_HANDLE_FILE_INFORMATION fi = new PInvokeWin32.BY_HANDLE_FILE_INFORMATION();
bool bRtn = PInvokeWin32.GetFileInformationByHandle(hRoot, out fi);
if (bRtn)
{
UInt64 fileIndexHigh = (UInt64)fi.FileIndexHigh;
UInt64 indexRoot = (fileIndexHigh << 32) | fi.FileIndexLow;
files.Add(indexRoot, new USNRecord
{
FRN = indexRoot,
Name = volumeName,
ParentFrn = 0,
IsVolumeRoot = true,
IsFolder = true,
VolumeName = volumeName
});
}
else
{
throw new IOException("GetFileInformationbyHandle() returned invalid handle",
new Win32Exception(Marshal.GetLastWin32Error()));
}
PInvokeWin32.CloseHandle(hRoot);
}
else
{
throw new IOException("Unable to get root frn entry", new Win32Exception(Marshal.GetLastWin32Error()));
}
}
internal static IntPtr GetVolumeJournalHandle(string volumeName)
{
string vol = string.Concat("\\\\.\\", volumeName);
IntPtr pVolume = PInvokeWin32.CreateFile(vol,
PInvokeWin32.GENERIC_READ | PInvokeWin32.GENERIC_WRITE,
PInvokeWin32.FILE_SHARE_READ | PInvokeWin32.FILE_SHARE_WRITE,
IntPtr.Zero,
PInvokeWin32.OPEN_EXISTING,
0,
IntPtr.Zero);
if (pVolume.ToInt32() == PInvokeWin32.INVALID_HANDLE_VALUE)
{
throw new IOException(string.Format("CreateFile(\"{0}\") returned invalid handle", volumeName),
new Win32Exception(Marshal.GetLastWin32Error()));
}
else
{
return(pVolume);
}
}
private void MonitorThread(string volume, MFTSearcherCache db)
{
IntPtr pbuffer = Marshal.AllocHGlobal(0x1000);
PInvokeWin32.READ_USN_JOURNAL_DATA rujd = SetupInputData4JournalRead(volume, 0xFFFFFFFF);
UInt32 cbRead;
IntPtr prujd;
while (true)
{
prujd = Marshal.AllocHGlobal(Marshal.SizeOf(rujd));
PInvokeWin32.ZeroMemory(prujd, Marshal.SizeOf(rujd));
Marshal.StructureToPtr(rujd, prujd, true);
IntPtr pVolume = MFTSearcher.GetVolumeJournalHandle(volume);
bool fok = PInvokeWin32.DeviceIoControl(pVolume,
PInvokeWin32.FSCTL_READ_USN_JOURNAL,
prujd, Marshal.SizeOf(typeof(PInvokeWin32.READ_USN_JOURNAL_DATA)),
pbuffer, 0x1000, out cbRead, IntPtr.Zero);
IntPtr pRealData = new IntPtr(pbuffer.ToInt32() + Marshal.SizeOf(typeof(Int64)));
uint offset = 0;
if (fok)
{
while (offset + Marshal.SizeOf(typeof(Int64)) < cbRead)
{
PInvokeWin32.USN_RECORD usn = new PInvokeWin32.USN_RECORD(new IntPtr(pRealData.ToInt32() + (int)offset));
ProcessUSN(usn, volume, db);
offset += usn.RecordLength;
}
}
Marshal.FreeHGlobal(prujd);
rujd.StartUsn = Marshal.ReadInt64(pbuffer);
}
}
private static void EnumerateVolume(string volumeName, Dictionary <ulong, USNRecord> files)
{
IntPtr medBuffer = IntPtr.Zero;
IntPtr pVolume = IntPtr.Zero;
try
{
AddVolumeRootRecord(volumeName, files);
pVolume = GetVolumeJournalHandle(volumeName);
EnableVomuleJournal(pVolume);
SetupMFTEnumInBuffer(ref medBuffer, pVolume);
EnumerateFiles(volumeName, pVolume, medBuffer, files);
}
catch (Exception e)
{
Console.WriteLine(e.Message, e);
Exception innerException = e.InnerException;
while (innerException != null)
{
Console.WriteLine(innerException.Message, innerException);
innerException = innerException.InnerException;
}
throw new ApplicationException("Error in EnumerateVolume()", e);
}
finally
{
if (pVolume.ToInt32() != PInvokeWin32.INVALID_HANDLE_VALUE)
{
PInvokeWin32.CloseHandle(pVolume);
if (medBuffer != IntPtr.Zero)
{
Marshal.FreeHGlobal(medBuffer);
}
}
}
}
unsafe private static void SetupMFTEnumInBuffer(ref IntPtr medBuffer, IntPtr pVolume)
{
uint bytesReturned = 0;
PInvokeWin32.USN_JOURNAL_DATA ujd = new PInvokeWin32.USN_JOURNAL_DATA();
bool bOk = QueryUSNJournal(pVolume, out ujd, out bytesReturned);
if (bOk)
{
PInvokeWin32.MFT_ENUM_DATA med;
med.StartFileReferenceNumber = 0;
med.LowUsn = 0;
med.HighUsn = ujd.NextUsn;
int sizeMftEnumData = Marshal.SizeOf(med);
medBuffer = Marshal.AllocHGlobal(sizeMftEnumData);
PInvokeWin32.ZeroMemory(medBuffer, sizeMftEnumData);
Marshal.StructureToPtr(med, medBuffer, true);
}
else
{
throw new IOException("DeviceIoControl() returned false", new Win32Exception(Marshal.GetLastWin32Error()));
}
}
unsafe private static void EnableVomuleJournal(IntPtr pVolume)
{
UInt64 MaximumSize = 0x800000;
UInt64 AllocationDelta = 0x100000;
UInt32 cb;
PInvokeWin32.CREATE_USN_JOURNAL_DATA cujd;
cujd.MaximumSize = MaximumSize;
cujd.AllocationDelta = AllocationDelta;
int sizeCujd = Marshal.SizeOf(cujd);
IntPtr cujdBuffer = Marshal.AllocHGlobal(sizeCujd);
PInvokeWin32.ZeroMemory(cujdBuffer, sizeCujd);
Marshal.StructureToPtr(cujd, cujdBuffer, true);
bool fOk = PInvokeWin32.DeviceIoControl(pVolume, PInvokeWin32.FSCTL_CREATE_USN_JOURNAL,
cujdBuffer, sizeCujd, IntPtr.Zero, 0, out cb, IntPtr.Zero);
if (!fOk)
{
throw new IOException("DeviceIoControl() returned false", new Win32Exception(Marshal.GetLastWin32Error()));
}
}