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from ctypes import *
from collections import defaultdict
import pathlib
import platform
from typing import Tuple
_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)]
class MultipleDataError(Structure):
_fields_ = [("data", c_void_p), ("other_data", c_void_p), ("error", c_void_p)]
VPNStateChange = CFUNCTYPE(None, c_char_p, c_char_p, c_char_p, c_char_p)
# Exposed functions
# 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.GetConnectConfig.argtypes, lib.GetConnectConfig.restype = [
c_char_p,
c_char_p,
c_int,
c_int,
], MultipleDataError
lib.Deregister.argtypes, lib.Deregister.restype = [c_char_p], c_void_p
lib.Register.argtypes, lib.Register.restype = [
c_char_p,
c_char_p,
VPNStateChange,
c_int,
], c_void_p
lib.GetOrganizationsList.argtypes, lib.GetOrganizationsList.restype = [
c_char_p
], DataError
lib.GetServersList.argtypes, lib.GetServersList.restype = [c_char_p], DataError
lib.CancelOAuth.argtypes, lib.CancelOAuth.restype = [c_char_p], c_void_p
lib.SetProfileID.argtypes, lib.SetProfileID.restype = [c_char_p, c_char_p], c_void_p
lib.SetConnected.argtypes, lib.SetConnected.restype = [c_char_p], c_void_p
lib.SetDisconnected.argtypes, lib.SetDisconnected.restype = [c_char_p], c_void_p
lib.GetIdentifier.argtypes, lib.GetIdentifier.restype = [c_char_p], DataError
lib.SetIdentifier.argtypes, lib.SetIdentifier.restype = [c_char_p, c_char_p], c_void_p
lib.SetSearchServer.argtypes, lib.SetSearchServer.restype = [c_char_p], c_void_p
lib.FreeString.argtypes, lib.FreeString.restype = [c_void_p], None
def encode_args(args, types):
for arg, t in zip(args, types):
# c_char_p needs the str to be encoded to bytes
if t is c_char_p:
arg = arg.encode("utf-8")
yield arg
def decode_res(t):
return decode_map.get(t, lambda x: x)
def get_ptr_string(ptr: c_void_p) -> str:
if ptr:
string = cast(ptr, c_char_p).value
lib.FreeString(ptr)
if string:
return string.decode()
return ""
def get_data_error(data_error: DataError) -> Tuple[str, str]:
data = get_ptr_string(data_error.data)
error = get_ptr_string(data_error.error)
return data, error
def get_multiple_data_error(
multiple_data_error: MultipleDataError,
) -> Tuple[str, str, str]:
data = get_ptr_string(multiple_data_error.data)
other_data = get_ptr_string(multiple_data_error.other_data)
error = get_ptr_string(multiple_data_error.error)
return data, other_data, error
decode_map = {
c_void_p: get_ptr_string,
DataError: get_data_error,
MultipleDataError: get_multiple_data_error,
}
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