| #!/usr/bin/env python |
| # -*- coding: utf-8 -*- |
| |
| """ pySim: Transport Link for Calypso bases phones |
| """ |
| |
| # |
| # Copyright (C) 2018 Vadim Yanitskiy <axilirator@gmail.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 select |
| import struct |
| import socket |
| import os |
| |
| from pySim.transport import LinkBase |
| from pySim.exceptions import * |
| from pySim.utils import h2b, b2h |
| |
| class L1CTLMessage(object): |
| |
| # Every (encoded) L1CTL message has the following structure: |
| # - msg_length (2 bytes, net order) |
| # - l1ctl_hdr (packed structure) |
| # - msg_type |
| # - flags |
| # - padding (2 spare bytes) |
| # - ... payload ... |
| |
| def __init__(self, msg_type, flags = 0x00): |
| # Init L1CTL message header |
| self.data = struct.pack("BBxx", msg_type, flags) |
| |
| def gen_msg(self): |
| return struct.pack("!H", len(self.data)) + self.data |
| |
| class L1CTLMessageReset(L1CTLMessage): |
| |
| # L1CTL message types |
| L1CTL_RESET_REQ = 0x0d |
| L1CTL_RESET_IND = 0x07 |
| L1CTL_RESET_CONF = 0x0e |
| |
| # Reset types |
| L1CTL_RES_T_BOOT = 0x00 |
| L1CTL_RES_T_FULL = 0x01 |
| L1CTL_RES_T_SCHED = 0x02 |
| |
| def __init__(self, type = L1CTL_RES_T_FULL): |
| super(L1CTLMessageReset, self).__init__(self.L1CTL_RESET_REQ) |
| self.data += struct.pack("Bxxx", type) |
| |
| class L1CTLMessageSIM(L1CTLMessage): |
| |
| # SIM related message types |
| L1CTL_SIM_REQ = 0x16 |
| L1CTL_SIM_CONF = 0x17 |
| |
| def __init__(self, pdu): |
| super(L1CTLMessageSIM, self).__init__(self.L1CTL_SIM_REQ) |
| self.data += pdu |
| |
| class CalypsoSimLink(LinkBase): |
| |
| def __init__(self, sock_path = "/tmp/osmocom_l2"): |
| # Make sure that a given socket path exists |
| if not os.path.exists(sock_path): |
| raise ReaderError("There is no such ('%s') UNIX socket" % sock_path) |
| |
| print("Connecting to osmocon at '%s'..." % sock_path) |
| |
| # Establish a client connection |
| self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) |
| self.sock.connect(sock_path) |
| |
| def __del__(self): |
| self.sock.close() |
| |
| def wait_for_rsp(self, exp_len = 128): |
| # Wait for incoming data (timeout is 3 seconds) |
| s, _, _ = select.select([self.sock], [], [], 3.0) |
| if not s: |
| raise ReaderError("Timeout waiting for card response") |
| |
| # Receive expected amount of bytes from osmocon |
| rsp = self.sock.recv(exp_len) |
| return rsp |
| |
| def reset_card(self): |
| # Request FULL reset |
| req_msg = L1CTLMessageReset() |
| self.sock.send(req_msg.gen_msg()) |
| |
| # Wait for confirmation |
| rsp = self.wait_for_rsp() |
| rsp_msg = struct.unpack_from("!HB", rsp) |
| if rsp_msg[1] != L1CTLMessageReset.L1CTL_RESET_CONF: |
| raise ReaderError("Failed to reset Calypso PHY") |
| |
| def connect(self): |
| self.reset_card() |
| |
| def disconnect(self): |
| pass # Nothing to do really ... |
| |
| def wait_for_card(self, timeout = None, newcardonly = False): |
| pass # Nothing to do really ... |
| |
| def send_apdu_raw(self, pdu): |
| """see LinkBase.send_apdu_raw""" |
| |
| # Request FULL reset |
| req_msg = L1CTLMessageSIM(h2b(pdu)) |
| self.sock.send(req_msg.gen_msg()) |
| |
| # Read message length first |
| rsp = self.wait_for_rsp(struct.calcsize("!H")) |
| msg_len = struct.unpack_from("!H", rsp)[0] |
| if msg_len < struct.calcsize("BBxx"): |
| raise ReaderError("Missing L1CTL header for L1CTL_SIM_CONF") |
| |
| # Read the whole message then |
| rsp = self.sock.recv(msg_len) |
| |
| # Verify L1CTL header |
| hdr = struct.unpack_from("BBxx", rsp) |
| if hdr[0] != L1CTLMessageSIM.L1CTL_SIM_CONF: |
| raise ReaderError("Unexpected L1CTL message received") |
| |
| # Verify the payload length |
| offset = struct.calcsize("BBxx") |
| if len(rsp) <= offset: |
| raise ProtocolError("Empty response from SIM?!?") |
| |
| # Omit L1CTL header |
| rsp = rsp[offset:] |
| |
| # Unpack data and SW |
| data = rsp[:-2] |
| sw = rsp[-2:] |
| |
| return b2h(data), b2h(sw) |