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Source Code for Module smartcard.ExclusiveTransmitCardConnection

 1  """Sample CardConnectionDecorator that provides exclusive transmit() 
 2   
 3  __author__ = "http://www.gemalto.com" 
 4   
 5  Copyright 2001-2011 gemalto 
 6  Author: Jean-Daniel Aussel, mailto:jean-daniel.aussel@gemalto.com 
 7   
 8  This file is part of pyscard. 
 9   
10  pyscard is free software; you can redistribute it and/or modify 
11  it under the terms of the GNU Lesser General Public License as published by 
12  the Free Software Foundation; either version 2.1 of the License, or 
13  (at your option) any later version. 
14   
15  pyscard is distributed in the hope that it will be useful, 
16  but WITHOUT ANY WARRANTY; without even the implied warranty of 
17  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
18  GNU Lesser General Public License for more details. 
19   
20  You should have received a copy of the GNU Lesser General Public License 
21  along with pyscard; if not, write to the Free Software 
22  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA 
23  """ 
24  from smartcard.CardConnection import CardConnection 
25  from smartcard.CardConnectionDecorator import CardConnectionDecorator 
26  from smartcard.Exceptions import CardConnectionException 
27  from smartcard.scard import SCardBeginTransaction, SCardEndTransaction, SCARD_LEAVE_CARD 
28  from smartcard.scard import SCardGetErrorMessage 
29  from smartcard.pcsc import PCSCCardConnection 
30  import smartcard.pcsc 
31   
32   
33 -class ExclusiveTransmitCardConnection(CardConnectionDecorator): 
34      '''This decorator uses SCardBeginTransaction/SCardEndTransaction to 
35      preserve other processes of threads to access the card during 
36      transmit().''' 
37   
38 -    def __init__(self, cardconnection): 
39          CardConnectionDecorator.__init__(self, cardconnection) 
40   
41 -    def lock(self): 
42          '''Lock card with SCardBeginTransaction.''' 
43   
44          component = self.component 
45          while True: 
46              if isinstance(component, smartcard.pcsc.PCSCCardConnection.PCSCCardConnection): 
47                  hresult = SCardBeginTransaction(component.hcard) 
48                  if 0 != hresult: 
49                      raise CardConnectionException('Failed to lock with SCardBeginTransaction' + SCardGetErrorMessage(hresult)) 
50                  else: 
51                      #print 'locked' 
52                      pass 
53                  break 
54              if hasattr(component, 'component'): 
55                  component = component.component 
56              else: 
57                  break 
58   
59 -    def unlock(self): 
60          '''Unlock card with SCardEndTransaction.''' 
61          component = self.component 
62          while True: 
63              if isinstance(component, smartcard.pcsc.PCSCCardConnection.PCSCCardConnection): 
64                  hresult = SCardEndTransaction(component.hcard, SCARD_LEAVE_CARD) 
65                  if 0 != hresult: 
66                      raise CardConnectionException('Failed to unlock with SCardEndTransaction' + SCardGetErrorMessage(hresult)) 
67                  else: 
68                      #print 'unlocked' 
69                      pass 
70                  break 
71              if hasattr(component, 'component'): 
72                  component = component.component 
73              else: 
74                  break 
75   
76 -    def transmit(self, bytes, protocol=None): 
77          '''Gain exclusive access to card during APDU transmission for if this 
78          decorator decorates a PCSCCardConnection.''' 
79          data, sw1, sw2 = CardConnectionDecorator.transmit(self, bytes, protocol) 
80          return data, sw1, sw2 
81   

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