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#! /usr/bin/env python3
# SCardBeginTransaction_deadlock.py: Unitary test for locking in
# SCardBeginTransaction, SCardTransmit, SCardStatus and SCardReconnect
# Copyright (C) 2012 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/>.
"""
# [Muscle] [PATCH] fix deadlock in PCSC-Lite
# http://archives.neohapsis.com/archives/dev/muscle/2012-q2/0109.html
# fixed in revisions 6358, 6359, 6360 and 6361
"""
import threading
import time
from smartcard.pcsc.PCSCExceptions import (
BaseSCardException,
EstablishContextException,
ListReadersException,
ReleaseContextException,
)
from smartcard.scard import (
SCARD_LEAVE_CARD,
SCARD_PROTOCOL_ANY,
SCARD_S_SUCCESS,
SCARD_SCOPE_USER,
SCARD_SHARE_SHARED,
SCardBeginTransaction,
SCardConnect,
SCardDisconnect,
SCardEndTransaction,
SCardEstablishContext,
SCardListReaders,
SCardReconnect,
SCardReleaseContext,
)
def myThread(hcontext1, reader):
"""access from another thread"""
print("thread 2: SCardConnect")
hresult, hcard2, _dwActiveProtocol = SCardConnect(
hcontext1, reader, SCARD_SHARE_SHARED, SCARD_PROTOCOL_ANY
)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
# wait for the 1st thread to begin a transaction
time.sleep(1)
"""
# check for SCardBeginTransaction
print("thread 2: SCardBeginTransaction")
hresult = SCardBeginTransaction(hcard2)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print("thread 2: SCardEndTransaction")
hresult = SCardEndTransaction(hcard2, SCARD_LEAVE_CARD)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
"""
"""
# check for SCardTransmit()
SELECT = [0x00, 0xA4, 0x00, 0x00, 0x02, 0x3F, 0x00]
print("thread 2: SCardTransmit")
hresult, response = SCardTransmit(hcard2, dwActiveProtocol, SELECT)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print(response)
"""
"""
# check for SCardStatus()
print("thread 2: SCardStatus")
hresult, reader, state, protocol, atr = SCardStatus(hcard2)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
"""
# check for SCardReconnect()
print("thread 2: SCardReconnect")
hresult, _dwActiveProtocol = SCardReconnect(
hcard2, SCARD_SHARE_SHARED, SCARD_PROTOCOL_ANY, SCARD_LEAVE_CARD
)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print("thread 2: SCardDisconnect")
hresult = SCardDisconnect(hcard2, SCARD_LEAVE_CARD)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
def main():
"""main"""
print("thread 1: SCardEstablishContext")
hresult, hcontext1 = SCardEstablishContext(SCARD_SCOPE_USER)
if hresult != SCARD_S_SUCCESS:
raise EstablishContextException(hresult)
print("thread 1: SCardListReaders")
hresult, readers = SCardListReaders(hcontext1, [])
if hresult != SCARD_S_SUCCESS:
raise ListReadersException(hresult)
print("PC/SC Readers:", readers)
reader = readers[0]
print("Using reader:", reader)
# second thread
t = threading.Thread(target=myThread, args=(hcontext1, reader))
t.start()
# wait for the 1st thread to begin a transaction
time.sleep(0.5)
print("thread 1: SCardConnect")
hresult, hcard1, _dwActiveProtocol = SCardConnect(
hcontext1, reader, SCARD_SHARE_SHARED, SCARD_PROTOCOL_ANY
)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print("thread 1: SCardBeginTransaction")
hresult = SCardBeginTransaction(hcard1)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
time.sleep(2)
print("thread 1: SCardEndTransaction")
hresult = SCardEndTransaction(hcard1, SCARD_LEAVE_CARD)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
# give time to thread2 to finish
time.sleep(1)
print("thread 1: SCardDisconnect")
hresult = SCardDisconnect(hcard1, SCARD_LEAVE_CARD)
if hresult != SCARD_S_SUCCESS:
raise BaseSCardException(hresult)
print("thread 1: SCardReleaseContext")
hresult = SCardReleaseContext(hcontext1)
if hresult != SCARD_S_SUCCESS:
raise ReleaseContextException(hresult)
if __name__ == "__main__":
main()
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