| #!/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 |
| |
| 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): |
| 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): |
| 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) |