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#! /usr/bin/env python3
# SCardBeginTransaction_SharedMode.py : Unitary test for
# SCardReleaseContext()
# Copyright (C) 2018 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/>.
"""
# SCardReleaseContext() should not release a PC/SC transaction not
# started by the released context
"""
import threading
import time
from smartcard.pcsc.PCSCExceptions import (
BaseSCardException,
EstablishContextException,
ListReadersException,
ReleaseContextException,
)
from smartcard.scard import SCARD_E_SHARING_VIOLATION # SCardDisconnect,
from smartcard.scard import (
SCARD_LEAVE_CARD,
SCARD_PROTOCOL_ANY,
SCARD_S_SUCCESS,
SCARD_SCOPE_USER,
SCARD_SHARE_SHARED,
SCardBeginTransaction,
SCardConnect,
SCardEndTransaction,
SCardEstablishContext,
SCardListReaders,
SCardReleaseContext,
SCardTransmit,
)
RED = "\033[0;31m"
BLUE = "\033[0;34m"
NORMAL = "\033[00m"
def init_client():
"""init a client"""
print("SCardEstablishContext")
hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
if hresult != SCARD_S_SUCCESS:
raise EstablishContextException(hresult)
print("SCardListReaders")
hresult, readers = SCardListReaders(hcontext, [])
if hresult != SCARD_S_SUCCESS:
raise ListReadersException(hresult)
reader = readers[0]
print("Using reader:", reader)
print("SCardConnect")
hresult, hcard, dwActiveProtocol = SCardConnect(
hcontext, reader, SCARD_SHARE_SHARED, SCARD_PROTOCOL_ANY
)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
return hcontext, hcard, reader, dwActiveProtocol
def thread_transaction():
"""Transcation on 2nd client"""
# 2nd client
hcontext2, hcard2, _reader, dwActiveProtocol = init_client()
time.sleep(0.5)
print("SCardBeginTransaction hcard2")
hresult = SCardBeginTransaction(hcard2)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
SELECT = [0x00, 0xA4, 0x00, 0x00, 0x02, 0x3F, 0x00]
print("SCardTransmit hcard2")
hresult, response = SCardTransmit(hcard2, dwActiveProtocol, SELECT)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print(response)
time.sleep(5)
print("SCardEndTransaction hcard2")
hresult = SCardEndTransaction(hcard2, SCARD_LEAVE_CARD)
if hresult == SCARD_E_SHARING_VIOLATION:
print(RED + " ERROR!" + NORMAL)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print("SCardReleaseContext hcontext2")
hresult = SCardReleaseContext(hcontext2)
if hresult != SCARD_S_SUCCESS:
raise ReleaseContextException(hresult)
def main():
"""main"""
# 1st client
hcontext1, _hcard1, _reader, dwActiveProtocol = init_client()
# 3rd client
hcontext3, hcard3, _reader, dwActiveProtocol = init_client()
t = threading.Thread(target=thread_transaction)
t.start()
time.sleep(1)
print("SCardReleaseContext hcontext1")
hresult = SCardReleaseContext(hcontext1)
if hresult not in (SCARD_S_SUCCESS, SCARD_E_SHARING_VIOLATION):
raise ReleaseContextException(hresult)
time.sleep(2)
before = time.time()
print("SCardBeginTransaction hcard3 (should block)")
hresult = SCardBeginTransaction(hcard3)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
after = time.time()
delta = (after - before) * 1000
print(f"Delta time: {delta} ms")
if delta < 1000:
print(RED + " ERROR! No blocking" + NORMAL)
else:
print(BLUE + "Blocking: OK" + NORMAL)
SELECT = [0x00, 0xA4, 0x00, 0x00, 0x02, 0x3F, 0x00]
print("SCardTransmit hcard3")
hresult, response = SCardTransmit(hcard3, dwActiveProtocol, SELECT)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print(response)
# wait for the thread
t.join()
print("SCardReleaseContext hcontext3")
hresult = SCardReleaseContext(hcontext3)
if hresult != SCARD_S_SUCCESS:
raise ReleaseContextException(hresult)
if __name__ == "__main__":
main()
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