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#!/usr/bin/env python
# -*- coding: utf-8 -*-
""" pySim: Transport Link for serial (RS232) based readers included with simcard
"""
#
# Copyright (C) 2009-2010 Sylvain Munaut <tnt@246tNt.com>
#
# 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 2 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/>.
#
from __future__ import absolute_import
import serial
import time
import os.path
from pySim.exceptions import NoCardError, ProtocolError
from pySim.transport import LinkBase
from pySim.utils import h2b, b2h
class SerialSimLink(LinkBase):
def __init__(self, device='/dev/ttyUSB0', baudrate=9600, rst='-rts', debug=False):
if not os.path.exists(device):
raise ValueError("device file %s does not exist -- abort" % device)
self._sl = serial.Serial(
port = device,
parity = serial.PARITY_EVEN,
bytesize = serial.EIGHTBITS,
stopbits = serial.STOPBITS_TWO,
timeout = 1,
xonxoff = 0,
rtscts = 0,
baudrate = baudrate,
)
self._rst_pin = rst
self._debug = debug
self._atr = None
def __del__(self):
if (hasattr(self, "_sl")):
self._sl.close()
def wait_for_card(self, timeout=None, newcardonly=False):
# Direct try
existing = False
try:
self.reset_card()
if not newcardonly:
return
else:
existing = True
except NoCardError:
pass
# Poll ...
mt = time.time() + timeout if timeout is not None else None
pe = 0
while (mt is None) or (time.time() < mt):
try:
time.sleep(0.5)
self.reset_card()
if not existing:
return
except NoCardError:
existing = False
except ProtocolError:
if existing:
existing = False
else:
# Tolerate a couple of protocol error ... can happen if
# we try when the card is 'half' inserted
pe += 1
if (pe > 2):
raise
# Timed out ...
raise NoCardError()
def connect(self):
self.reset_card()
def get_atr(self):
return self._atr
def disconnect(self):
pass # Nothing to do really ...
def reset_card(self):
rv = self._reset_card()
if rv == 0:
raise NoCardError()
elif rv < 0:
raise ProtocolError()
def _reset_card(self):
self._atr = None
rst_meth_map = {
'rts': self._sl.setRTS,
'dtr': self._sl.setDTR,
}
rst_val_map = { '+':0, '-':1 }
try:
rst_meth = rst_meth_map[self._rst_pin[1:]]
rst_val = rst_val_map[self._rst_pin[0]]
except:
raise ValueError('Invalid reset pin %s' % self._rst_pin)
rst_meth(rst_val)
time.sleep(0.1) # 100 ms
self._sl.flushInput()
rst_meth(rst_val ^ 1)
b = self._rx_byte()
if not b:
return 0
if ord(b) != 0x3b:
return -1
self._dbg_print("TS: 0x%x Direct convention" % ord(b))
while ord(b) == 0x3b:
b = self._rx_byte()
if not b:
return -1
t0 = ord(b)
self._dbg_print("T0: 0x%x" % t0)
self._atr = [0x3b, ord(b)]
for i in range(4):
if t0 & (0x10 << i):
b = self._rx_byte()
self._atr.append(ord(b))
self._dbg_print("T%si = %x" % (chr(ord('A')+i), ord(b)))
for i in range(0, t0 & 0xf):
b = self._rx_byte()
self._atr.append(ord(b))
self._dbg_print("Historical = %x" % ord(b))
while True:
x = self._rx_byte()
if not x:
break
self._atr.append(ord(x))
self._dbg_print("Extra: %x" % ord(x))
return 1
def _dbg_print(self, s):
if self._debug:
print(s)
def _tx_byte(self, b):
self._sl.write(b)
r = self._sl.read()
if r != b: # TX and RX are tied, so we must clear the echo
raise ProtocolError("Bad echo value. Expected %02x, got %s)" % (ord(b), '%02x'%ord(r) if r else '(nil)'))
def _tx_string(self, s):
"""This is only safe if it's guaranteed the card won't send any data
during the time of tx of the string !!!"""
self._sl.write(s)
r = self._sl.read(len(s))
if r != s: # TX and RX are tied, so we must clear the echo
raise ProtocolError("Bad echo value (Expected: %s, got %s)" % (b2h(s), b2h(r)))
def _rx_byte(self):
return self._sl.read()
def send_apdu_raw(self, pdu):
"""see LinkBase.send_apdu_raw"""
pdu = h2b(pdu)
data_len = ord(pdu[4]) # P3
# Send first CLASS,INS,P1,P2,P3
self._tx_string(pdu[0:5])
# Wait ack which can be
# - INS: Command acked -> go ahead
# - 0x60: NULL, just wait some more
# - SW1: The card can apparently proceed ...
while True:
b = self._rx_byte()
if b == pdu[1]:
break
elif b != '\x60':
# Ok, it 'could' be SW1
sw1 = b
sw2 = self._rx_byte()
nil = self._rx_byte()
if (sw2 and not nil):
return '', b2h(sw1+sw2)
raise ProtocolError()
# Send data (if any)
if len(pdu) > 5:
self._tx_string(pdu[5:])
# Receive data (including SW !)
# length = [P3 - tx_data (=len(pdu)-len(hdr)) + 2 (SW1//2) ]
to_recv = data_len - len(pdu) + 5 + 2
data = ''
while (len(data) < to_recv):
b = self._rx_byte()
if (to_recv == 2) and (b == '\x60'): # Ignore NIL if we have no RX data (hack ?)
continue
if not b:
break
data += b
# Split datafield from SW
if len(data) < 2:
return None, None
sw = data[-2:]
data = data[0:-2]
# Return value
return b2h(data), b2h(sw)
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