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from ctypes import *
from collections import defaultdict
import pathlib
import platform
_lib_prefixes = defaultdict(
lambda: "lib",
{
"windows": "",
},
)
_lib_suffixes = defaultdict(
lambda: ".so",
{
"windows": ".dll",
"darwin": ".dylib",
},
)
_os = platform.system().lower()
_libname = "eduvpn_common"
_libfile = f"{_lib_prefixes[_os]}{_libname}{_lib_suffixes[_os]}"
# Library should have been copied to the lib/ folder
lib = cdll.LoadLibrary(str(pathlib.Path(__file__).parent / "lib" / _libfile))
class DataError(Structure):
_fields_ = [("data", c_void_p), ("error", c_void_p)]
VPNStateChange = CFUNCTYPE(None, c_char_p, c_char_p, c_char_p)
# Exposed functions
lib.Register.argtypes, lib.Register.restype = [c_char_p, c_char_p, VPNStateChange], None
lib.GetOrganizationsList.argtypes, lib.GetOrganizationsList.restype = [], DataError
lib.GetServersList.argtypes, lib.GetServersList.restype = [], DataError
# We have to use c_void_p instead of c_char_p to free it properly
# See https://stackoverflow.com/questions/13445568/python-ctypes-how-to-free-memory-getting-invalid-pointer-error
lib.FreeString.argtypes, lib.FreeString.restype = [c_void_p], None
def GetPtrString(ptr):
if ptr:
string = cast(ptr, c_char_p).value
lib.FreeString(ptr)
if string:
return string.decode()
return ""
def GetDataError(data_error):
data = GetPtrString(data_error.data)
error = GetPtrString(data_error.error)
return data, error
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