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#! /usr/bin/env python3
# SCardGetStatusChange.py : Unitary test for SCardGetStatusChange()
# Copyright (C) 2011 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 the return value of SCardGetStatusChange() after a reader has
# been removed.
#
# Windows has a different behavior (Viktor Tarasov) :
# https://github.com/viktorTarasov/OpenSC/commit/62bda63bd66c4849c0ca4303a9682fb6f6bacd7d
# /* When token is hot-unplugged:
# * - in Linux (pcsc-lite)
# * -- SCardGetStatusChange returns OK;
# * -- current reader state is 'UNKNOWN';
# * -- 'Refresh-attributes' returns 'SC_ERROR_READER_DETACHED'.
# *
# * - in Windows (WinSCard):
# * -- SCardGetStatusChange fails with SCARD_E_NO_READERS_AVAILABLE;
# * -- 'Refresh-attributes' returns 'SC_ERROR_NO_READERS_FOUND'.
# *
# * - FIXME: Mac?
# */
"""
from smartcard.pcsc.PCSCExceptions import (
BaseSCardException,
EstablishContextException,
ListReadersException,
ReleaseContextException,
)
from smartcard.scard import (
SCARD_E_TIMEOUT,
SCARD_S_SUCCESS,
SCARD_SCOPE_USER,
SCARD_STATE_ATRMATCH,
SCARD_STATE_CHANGED,
SCARD_STATE_EMPTY,
SCARD_STATE_EXCLUSIVE,
SCARD_STATE_IGNORE,
SCARD_STATE_INUSE,
SCARD_STATE_MUTE,
SCARD_STATE_PRESENT,
SCARD_STATE_UNAVAILABLE,
SCARD_STATE_UNAWARE,
SCARD_STATE_UNKNOWN,
SCARD_STATE_UNPOWERED,
SCardEstablishContext,
SCardGetErrorMessage,
SCardGetStatusChange,
SCardListReaders,
SCardReleaseContext,
)
def parseEventState(my_eventstate):
"""state to text"""
stateList = []
states = {
SCARD_STATE_IGNORE: "Ignore",
SCARD_STATE_CHANGED: "Changed",
SCARD_STATE_UNKNOWN: "Unknown",
SCARD_STATE_UNAVAILABLE: "Unavailable",
SCARD_STATE_EMPTY: "Empty",
SCARD_STATE_PRESENT: "Present",
SCARD_STATE_ATRMATCH: "ATR match",
SCARD_STATE_EXCLUSIVE: "Exclusive",
SCARD_STATE_INUSE: "In use",
SCARD_STATE_MUTE: "Mute",
SCARD_STATE_UNPOWERED: "Unpowered",
}
for state, text in states.items():
if my_eventstate & state:
stateList.append(text)
return stateList
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 readerState in newstates:
readername, eventstate, atr = readerState
readerstates[readername] = (readername, eventstate)
print("Remove the reader")
hresult, newstates = SCardGetStatusChange(hcontext, 10000, list(readerstates.values()))
print("SCardGetStatusChange()", SCardGetErrorMessage(hresult))
if hresult not in (SCARD_S_SUCCESS, SCARD_E_TIMEOUT):
raise BaseSCardException(hresult)
for readerState in newstates:
readername, eventstate, atr = readerState
print(readername, hex(eventstate))
print(parseEventState(eventstate))
hresult = SCardReleaseContext(hcontext)
print("SCardReleaseContext()", SCardGetErrorMessage(hresult))
if hresult != SCARD_S_SUCCESS:
raise ReleaseContextException(hresult)
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