UnitaryTests/SCardCancel3.py
#! /usr/bin/env python3
# SCardCancel3.py : Unitary test for SCardCancel()
# Copyright (C) 2016 Ludovic Rousseau
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, see <http://www.gnu.org/licenses/>.
# Check event after SCardCancel is correctly handled
# When a SCardGetStatusChange() was cancelled then a next PC/SC call
# after the SCardGetStatusChange() may fail with a strange error code if
# the event waited in SCardGetStatusChange() occurs.
# The bug has been fixed in 57b0ba5a200bcbf1c489d39261340324392a8e8a
from smartcard.scard import *
from smartcard.pcsc.PCSCExceptions import *
import threading
import time
import sys
def getstatuschange():
# this call will be cancelled
hresult, newstates = SCardGetStatusChange(hcontext, 10000,
list(readerstates.values()))
print("SCardGetStatusChange()", SCardGetErrorMessage(hresult))
if hresult != SCARD_S_SUCCESS and hresult != SCARD_E_TIMEOUT:
if SCARD_E_CANCELLED == hresult:
print("Cancelled")
else:
raise BaseSCardException(hresult)
print("Finished")
print("Remove the card and press enter")
sys.stdin.read(1)
# try another PC/SC call. It should return SCARD_W_REMOVED_CARD and
# not something else
hresult, reader, state, protocol, atr = SCardStatus(hcard)
if hresult != SCARD_S_SUCCESS:
if hresult != SCARD_W_REMOVED_CARD:
raise BaseSCardException(hresult)
else:
print("Card removed")
hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
if hresult != SCARD_S_SUCCESS:
raise EstablishContextException(hresult)
hresult, readers = SCardListReaders(hcontext, [])
if hresult != SCARD_S_SUCCESS:
raise ListReadersException(hresult)
print('PC/SC Readers:', readers)
readerstates = {}
for reader in readers:
readerstates[reader] = (reader, SCARD_STATE_UNAWARE)
hresult, newstates = SCardGetStatusChange(hcontext, 0,
list(readerstates.values()))
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print(newstates)
for state in newstates:
readername, eventstate, atr = state
readerstates[readername] = (readername, eventstate)
# Connect in SCARD_SHARE_SHARED mode
hresult, hcard, dwActiveProtocol = SCardConnect(hcontext, reader,
SCARD_SHARE_SHARED, SCARD_PROTOCOL_ANY)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
t = threading.Thread(target=getstatuschange)
t.start()
time.sleep(1)
print("cancel")
hresult = SCardCancel(hcontext)
if hresult != SCARD_S_SUCCESS:
print('Failed to SCardCancel: ' + SCardGetErrorMessage(hresult))
time.sleep(5)
hresult = SCardReleaseContext(hcontext)
print("SCardReleaseContext()", SCardGetErrorMessage(hresult))
if hresult != SCARD_S_SUCCESS:
raise ReleaseContextException(hresult)