1 """CardConnectionDecorator that provides exclusive use of a card.
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 SCardConnect, SCardDisconnect, SCARD_LEAVE_CARD, SCARD_SHARE_EXCLUSIVE
28 from smartcard.scard import SCardGetErrorMessage
29 from smartcard.pcsc import PCSCCardConnection
30 import smartcard.pcsc
31
32
34 '''This decorator uses exclusive access to the card during
35 connection to prevent other processes to connect to this card.'''
36
39
40 - def connect(self, protocol=None, mode=None, disposition=None):
41 '''Disconnect and reconnect in exclusive mode PCSCCardconnections.'''
42 CardConnectionDecorator.connect(self, protocol, mode, disposition)
43 component = self.component
44 while True:
45 if isinstance(component, smartcard.pcsc.PCSCCardConnection.PCSCCardConnection):
46 pcscprotocol = PCSCCardConnection.translateprotocolmask(protocol)
47 if 0 == pcscprotocol:
48 pcscprotocol = component.getProtocol()
49
50 if None != component.hcard:
51 hresult = SCardDisconnect(component.hcard, SCARD_LEAVE_CARD)
52 if hresult != 0:
53 raise CardConnectionException('Failed to disconnect: '
54 + SCardGetErrorMessage(hresult))
55 hresult, component.hcard, dwActiveProtocol = SCardConnect(
56 component.hcontext, str(component.reader),
57 SCARD_SHARE_EXCLUSIVE, pcscprotocol)
58 if hresult != 0:
59 raise CardConnectionException('Failed to connect with SCARD_SHARE_EXCLUSIVE' + SCardGetErrorMessage(hresult))
60
61 break
62 if hasattr(component, 'component'):
63 component = component.component
64 else:
65 break
66