Thanks Eryk!
That was exactly what I needed. I will have to read up on the _pack_ directive
to understand it but for now things are running the way they should be.
I did have one typo in what I originally pasted that made its way into what you
provided.
('volumeID', ctypes.c_wchar * VOLUME_ID_SIZE),
should actually be
('volumeID', ctypes.c_char * VOLUME_ID_SIZE),
So, if someone else comes along and tries this out they should make that one
change.
Anyway, you made my day. Thanks again!
Doug
________________________________
From: Eryk Sun <eryk...@gmail.com>
Sent: Monday, February 8, 2021 8:24 PM
To: python-win32@python.org <python-win32@python.org>
Cc: Doug Campbell <wdouglascampb...@hotmail.com>
Subject: Re: [python-win32] DeviceIOControl calls respond with parameter
incorrect
On 2/8/21, Doug Campbell <wdouglascampb...@hotmail.com> wrote:
> In my python 2 script, I am trying to connect to the VeraCrypt device driver
> to get some information on my mounted volumes.
The VeraCrypt repo on GitHub [1] indicates that all structures are
defined with #pragma pack(1). In ctypes this is the _pack_ directive.
Try the following:
import ctypes
import winioctlcon
import win32file
def VC_IOCTL(CODE):
return winioctlcon.CTL_CODE(winioctlcon.FILE_DEVICE_UNKNOWN,
0x800 + CODE, winioctlcon.METHOD_BUFFERED,
winioctlcon.FILE_ANY_ACCESS)
VC_IOCTL_GET_MOUNTED_VOLUMES = VC_IOCTL(6)
VC_IOCTL_GET_VOLUME_PROPERTIES = VC_IOCTL(7)
VC_IOCTL_GET_BOOT_ENCRYPTION_STATUS = VC_IOCTL(18)
VC_IOCTL_GET_BOOT_DRIVE_VOLUME_PROPERTIES = VC_IOCTL(22)
VC_IOCTL_EMERGENCY_CLEAR_KEYS = VC_IOCTL(41)
MAX_PATH = 260
VOLUME_LABEL_LENGTH = 33 # 32 + null
VOLUME_ID_SIZE = 32
WIN32_ROOT_PREFIX DRIVER_STR = r'\\.\VeraCrypt'
class VOLUME_PROPERTIES_STRUCT(ctypes.Structure):
_pack_ = 1
_fields_ = (
('driveNo', ctypes.c_int),
('uniqueId', ctypes.c_int),
('wszVolume', ctypes.c_wchar * MAX_PATH),
('diskLength', ctypes.c_uint64),
('ea', ctypes.c_int),
('mode', ctypes.c_int),
('pkcs5', ctypes.c_int),
('pkcs5Iterations', ctypes.c_int),
('hiddenVolume', ctypes.c_int),
('readOnly', ctypes.c_int),
('removable', ctypes.c_int),
('partitionInInactiveSysEncScope', ctypes.c_int),
('volFormatVersion', ctypes.c_uint32),
('totalBytesRead', ctypes.c_uint64),
('totalBytesWritten', ctypes.c_uint64),
('hiddenVolProtection', ctypes.c_int),
('volFormatVersion', ctypes.c_int),
('volumePim', ctypes.c_int),
('wszLabel', ctypes.c_wchar * VOLUME_LABEL_LENGTH),
('bDriverSetLabel', ctypes.c_int),
('volumeID', ctypes.c_wchar * VOLUME_ID_SIZE),
('mountDisabled', ctypes.c_int))
prop = VOLUME_PROPERTIES_STRUCT(driveNo = ord('F') - ord('A'))
hDevice = win32file.CreateFile(WIN32_ROOT_PREFIX DRIVER_STR, 0, 0, None,
win32file.OPEN_EXISTING, 0, None)
try:
info = win32file.DeviceIoControl(hDevice,
VC_IOCTL_GET_VOLUME_PROPERTIES, prop, prop)
finally:
hDevice.close()
---
[1] https://github.com/veracrypt/VeraCrypt/blob/master/src/Common/Apidrvr.h
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