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Reading/Writing OpenVPN's TUN/TAP Device under Windows using Python.
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import _winreg as reg | |
import win32file | |
adapter_key = r'SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}' | |
def get_device_guid(): | |
with reg.OpenKey(reg.HKEY_LOCAL_MACHINE, adapter_key) as adapters: | |
try: | |
for i in xrange(10000): | |
key_name = reg.EnumKey(adapters, i) | |
with reg.OpenKey(adapters, key_name) as adapter: | |
try: | |
component_id = reg.QueryValueEx(adapter, 'ComponentId')[0] | |
if component_id == 'tap0801': | |
return reg.QueryValueEx(adapter, 'NetCfgInstanceId')[0] | |
except WindowsError, err: | |
pass | |
except WindowsError, err: | |
pass | |
def CTL_CODE(device_type, function, method, access): | |
return (device_type << 16) | (access << 14) | (function << 2) | method; | |
def TAP_CONTROL_CODE(request, method): | |
return CTL_CODE(34, request, method, 0) | |
TAP_IOCTL_CONFIG_POINT_TO_POINT = TAP_CONTROL_CODE(5, 0) | |
TAP_IOCTL_SET_MEDIA_STATUS = TAP_CONTROL_CODE(6, 0) | |
TAP_IOCTL_CONFIG_TUN = TAP_CONTROL_CODE(10, 0) | |
if __name__ == '__main__': | |
guid = get_device_guid() | |
handle = win32file.CreateFile(r'\\.\Global\%s.tap' % guid, | |
win32file.GENERIC_READ | win32file.GENERIC_WRITE, | |
win32file.FILE_SHARE_READ | win32file.FILE_SHARE_WRITE, | |
None, win32file.OPEN_EXISTING, | |
win32file.FILE_ATTRIBUTE_SYSTEM, # | win32file.FILE_FLAG_OVERLAPPED, | |
None) | |
print(handle.handle) | |
if False: | |
win32file.DeviceIoControl(handle, TAP_IOCTL_CONFIG_POINT_TO_POINT, | |
'\xc0\xa8\x11\x01\xc0\xa8\x11\x10', None); | |
else: | |
win32file.DeviceIoControl(handle, TAP_IOCTL_SET_MEDIA_STATUS, '\x01\x00\x00\x00', None) | |
win32file.DeviceIoControl(handle, TAP_IOCTL_CONFIG_TUN, | |
'\x0a\x03\x00\x01\x0a\x03\x00\x00\xff\xff\xff\x00', None) | |
while True: | |
l, p = win32file.ReadFile(handle, 2000) | |
q = p[:12] + p[16:20] + p[12:16] + p[20:] | |
win32file.WriteFile(handle, q) | |
print(p, q) | |
win32file.CloseHandle(handle) |
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