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from ctypes import *
from collections import defaultdict
from enum import Enum
import pathlib
import platform
from typing import Tuple, Optional
import json
_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]}"
lib = None
# Try to load in the normal path
try:
lib = cdll.LoadLibrary(_libfile)
# Otherwise, library should have been copied to the lib/ folder
except:
lib = cdll.LoadLibrary(str(pathlib.Path(__file__).parent / "lib" / _libfile))
class ErrorLevel(Enum):
ERR_OTHER = 0
ERR_INFO = 1
class DataError(Structure):
_fields_ = [("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.GetConfigSecureInternet.argtypes, lib.GetConfigSecureInternet.restype = [
c_char_p,
c_char_p,
c_int,
], DataError
lib.GetConfigInstituteAccess.argtypes, lib.GetConfigInstituteAccess.restype = [
c_char_p,
c_char_p,
c_int,
], DataError
lib.GetConfigCustomServer.argtypes, lib.GetConfigCustomServer.restype = [
c_char_p,
c_char_p,
c_int,
], DataError
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.GetDiscoOrganizations.argtypes, lib.GetDiscoOrganizations.restype = [
c_char_p
], DataError
lib.GetDiscoServers.argtypes, lib.GetDiscoServers.restype = [c_char_p], DataError
lib.GoBack.argtypes, lib.GoBack.restype = [c_char_p], None
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.ChangeSecureLocation.argtypes, lib.ChangeSecureLocation.restype = [c_char_p], c_void_p
lib.SetSecureLocation.argtypes, lib.SetSecureLocation.restype = [
c_char_p,
c_char_p,
], c_void_p
lib.SetConnected.argtypes, lib.SetConnected.restype = [c_char_p], c_void_p
lib.SetConnecting.argtypes, lib.SetConnecting.restype = [c_char_p], c_void_p
lib.SetDisconnected.argtypes, lib.SetDisconnected.restype = [c_char_p], c_void_p
lib.SetSearchServer.argtypes, lib.SetSearchServer.restype = [c_char_p], c_void_p
lib.ShouldRenewButton.argtypes, lib.ShouldRenewButton.restype = [], int
lib.FreeString.argtypes, lib.FreeString.restype = [c_void_p], None
class WrappedError:
def __init__(self, traceback: str, cause: str, level: ErrorLevel):
self.traceback = traceback
self.cause = cause
self.level = level
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_ptr_error(ptr: c_void_p) -> Optional[WrappedError]:
error_string = get_ptr_string(ptr)
if not error_string:
return None
error_json = json.loads(error_string)
if not error_json:
return None
level = error_json["level"]
traceback = error_json["traceback"]
cause = error_json["cause"]
return WrappedError(traceback, cause, ErrorLevel(level))
def get_error(ptr: c_void_p) -> str:
error = get_ptr_error(ptr)
if not error:
return ""
return error.traceback
def get_data_error(data_error: DataError) -> Tuple[str, str]:
data = get_ptr_string(data_error.data)
error = get_error(data_error.error)
return data, error
def get_bool(boolInt: c_int) -> bool:
return boolInt == 1
decode_map = {
c_int: get_bool,
c_void_p: get_error,
DataError: get_data_error,
}
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