mirror of https://gerrit.osmocom.org/pysim
pySim.transport: Add mechanism for handling for CAT/USAT proactive cmds
This introduces an optional argument to the LinkBase class constructor, where the application can pass an instance of a ProactiveHandler derived class in order to handle the proactive commands that the LinkBase is automatically fetching whenever the card indicates so. Change-Id: I844504e2fc1b27ce4fc7ede20b2307e698baa0f6
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@ -9,11 +9,12 @@ from typing import Optional, Tuple
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from pySim.exceptions import *
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from pySim.construct import filter_dict
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from pySim.utils import sw_match, b2h, h2b, i2h
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from pySim.utils import sw_match, b2h, h2b, i2h, Hexstr
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from pySim.cat import ProactiveCommand
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#
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# Copyright (C) 2009-2010 Sylvain Munaut <tnt@246tNt.com>
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# Copyright (C) 2021 Harald Welte <laforge@osmocom.org>
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# Copyright (C) 2021-2022 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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@ -37,13 +38,36 @@ class ApduTracer:
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def trace_response(self, cmd, sw, resp):
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pass
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class ProactiveHandler(abc.ABC):
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"""Abstract base class representing the interface of some code that handles
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the proactive commands, as returned by the card in responses to the FETCH
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command."""
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def receive_fetch_raw(self, payload: Hexstr):
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# parse the proactive command
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pcmd = ProactiveCommand()
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parsed = pcmd.from_tlv(h2b(payload))
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# try to find a generic handler like handle_SendShortMessage
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handle_name = 'handle_%s' % type(parsed).__name__
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if hasattr(self, handle_name):
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handler = getattr(self, handle_name)
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return handler(pcmd.decoded)
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# fall back to common handler
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return self.receive_fetch(pcmd)
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def receive_fetch(self, pcmd: ProactiveCommand):
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"""Default handler for not otherwise handled proactive commands."""
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raise NotImplementedError('No handler method for %s' % pcmd.decoded)
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class LinkBase(abc.ABC):
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"""Base class for link/transport to card."""
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def __init__(self, sw_interpreter=None, apdu_tracer=None):
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def __init__(self, sw_interpreter=None, apdu_tracer=None,
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proactive_handler: Optional[ProactiveHandler]=None):
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self.sw_interpreter = sw_interpreter
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self.apdu_tracer = apdu_tracer
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self.proactive_handler = proactive_handler
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@abc.abstractmethod
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def _send_apdu_raw(self, pdu: str) -> Tuple[str, str]:
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@ -137,10 +161,12 @@ class LinkBase(abc.ABC):
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"""
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rv = self.send_apdu(pdu)
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if sw == '9000' and sw_match(rv[1], '91xx'):
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while sw == '9000' and sw_match(rv[1], '91xx'):
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# proactive sim as per TS 102 221 Setion 7.4.2
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rv = self.send_apdu_checksw('80120000' + rv[1][2:], sw)
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print("FETCH: %s", rv[0])
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print("FETCH: %s" % rv[0])
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if self.proactive_handler:
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self.proactive_handler.receive_fetch_raw(rv[0])
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if not sw_match(rv[1], sw):
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raise SwMatchError(rv[1], sw.lower(), self.sw_interpreter)
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return rv
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