# coding=utf-8 # (C) 2022 by Harald Welte # # 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 . from osmocom.gsmtap import GsmtapReceiver from pySim.apdu.ts_102_221 import ApduCommands as UiccApduCommands from pySim.apdu.ts_102_222 import ApduCommands as UiccAdmApduCommands from pySim.apdu.ts_31_102 import ApduCommands as UsimApduCommands from pySim.apdu.global_platform import ApduCommands as GpApduCommands from . import ApduSource, PacketType, CardReset ApduCommands = UiccApduCommands + UiccAdmApduCommands + UsimApduCommands + GpApduCommands class GsmtapApduSource(ApduSource): """ApduSource for handling GSMTAP-SIM messages received via UDP, such as those generated by simtrace2-sniff. Note that *if* you use IP loopback and localhost addresses (which is the default), you will need to start this source before starting simtrace2-sniff, as otherwise the latter will claim the GSMTAP UDP port. """ def __init__(self, bind_ip:str='127.0.0.1', bind_port:int=4729): """Create a UDP socket for receiving GSMTAP-SIM messages. Args: bind_ip: IP address to which the socket should be bound (default: 127.0.0.1) bind_port: UDP port number to which the socket should be bound (default: 4729) """ super().__init__() self.gsmtap = GsmtapReceiver(bind_ip, bind_port) def read_packet(self) -> PacketType: gsmtap_msg, _addr = self.gsmtap.read_packet() if gsmtap_msg['type'] != 'sim': raise ValueError('Unsupported GSMTAP type %s' % gsmtap_msg['type']) sub_type = gsmtap_msg['sub_type'] if sub_type == 'apdu': return ApduCommands.parse_cmd_bytes(gsmtap_msg['body']) if sub_type == 'atr': # card has been reset return CardReset(gsmtap_msg['body']) if sub_type in ['pps_req', 'pps_rsp']: # simply ignore for now pass else: raise ValueError('Unsupported GSMTAP-SIM sub-type %s' % sub_type)