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58 lines
2.5 KiB
58 lines
2.5 KiB
# coding=utf-8
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# (C) 2022 by Harald Welte <laforge@osmocom.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from pySim.gsmtap import GsmtapMessage, GsmtapSource
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from . import ApduSource, PacketType, CardReset
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from pySim.apdu.ts_102_221 import ApduCommands as UiccApduCommands
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from pySim.apdu.ts_31_102 import ApduCommands as UsimApduCommands
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from pySim.apdu.global_platform import ApduCommands as GpApduCommands
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ApduCommands = UiccApduCommands + UsimApduCommands + GpApduCommands
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class GsmtapApduSource(ApduSource):
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"""ApduSource for handling GSMTAP-SIM messages received via UDP, such as
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those generated by simtrace2-sniff. Note that *if* you use IP loopback
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and localhost addresses (which is the default), you will need to start
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this source before starting simtrace2-sniff, as otherwise the latter will
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claim the GSMTAP UDP port.
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"""
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def __init__(self, bind_ip:str='127.0.0.1', bind_port:int=4729):
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"""Create a UDP socket for receiving GSMTAP-SIM messages.
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Args:
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bind_ip: IP address to which the socket should be bound (default: 127.0.0.1)
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bind_port: UDP port number to which the socket should be bound (default: 4729)
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"""
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super().__init__()
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self.gsmtap = GsmtapSource(bind_ip, bind_port)
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def read_packet(self) -> PacketType:
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gsmtap_msg, addr = self.gsmtap.read_packet()
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if gsmtap_msg['type'] != 'sim':
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raise ValueError('Unsupported GSMTAP type %s' % gsmtap_msg['type'])
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sub_type = gsmtap_msg['sub_type']
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if sub_type == 'apdu':
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return ApduCommands.parse_cmd_bytes(gsmtap_msg['body'])
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elif sub_type == 'atr':
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# card has been reset
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return CardReset()
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elif sub_type in ['pps_req', 'pps_rsp']:
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# simply ignore for now
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pass
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else:
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raise ValueError('Unsupported GSMTAP-SIM sub-type %s' % sub_type)
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