def process_handover_request_message(self, records):
"""Process a handover request message. The *records* argument holds a
list of :class:`ndef.Record` objects decoded from the received
handover request message octets, where the first record type is
``urn:nfc:wkt:Hr``. The method returns a list of :class:`ndef.Record`
objects with the first record typ ``urn:nfc:wkt:Hs``.
This method should be overwritten by a subclass to customize
it's behavior. The default implementation returns a
:class:`ndef.HandoverSelectRecord` with version ``1.2`` and no
alternative carriers.
"""
log.warning("default process_request method should be overwritten")
return [ndef.HandoverSelectRecord('1.2')]
def select_carrier(self, hr_records):
self.select_carrier_lock.acquire()
log.info("<<< %s", '\n '.join(str(r) for r in hr_records))
hs_records = [ndef.HandoverSelectRecord('1.2')]
if hr_records[0].version_info.minor == 0 and self.options.quirks:
log.warning("quirks: accept handover version 1.0 as 1.1")
elif hr_records[0].version_info.minor not in range(1, 3):
log.warning("unsupported minor version")
self.select_carrier_lock.release()
return hs_records
remote_carrier_records = dict(
(record.name, record) for record in hr_records[1:] if record.name)
for ac in hr_records[0].alternative_carriers:
record = remote_carrier_records[ac.carrier_data_reference]
if record.type == 'urn:nfc:wkt:Hc':
remote_carrier_type = record.carrier_type
else:
remote_carrier_type = record.type
for carrier_records in self.options.selectable:
selected = len(hs_records[0].alternative_carriers)
if not selected < self.options.select:
break
if carrier_records[0].type == 'urn:nfc:wkt:Hc':
local_carrier_type = carrier_records[0].carrier_type
else:
local_carrier_type = carrier_records[0].type
if remote_carrier_type == local_carrier_type:
log.info("match for {0}".format(local_carrier_type))
cdr = carrier_records[0].name
adr = [record.name for record in carrier_records]
hs_records[0].add_alternative_carrier('active', cdr, *adr)
hs_records.extend(carrier_records)
log.info(">>> %s", '\n '.join(str(r) for r in hs_records))
self.select_carrier_lock.release()
if self.options.delay:
log.info("delay response for {0} ms".format(self.options.delay))
time.sleep(self.options.delay * 1e-3)
return hs_records
def write_nfc_hs(clf, wait_remove=True):
print("Write NFC Handover Select record on a tag")
data = wpas_get_nfc_uri()
if data is None:
summary("Could not get NFC URI from wpa_supplicant")
return
global dpp_sel_wait_remove
dpp_sel_wait_remove = wait_remove
print("URI: %s" % data)
uri = ndef.UriRecord(data)
print(uri)
carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data)
hs = ndef.HandoverSelectRecord('1.4')
hs.add_alternative_carrier('active', carrier.name)
print(hs)
print(carrier)
print("Touch an NFC tag")
global dpp_tag_data
dpp_tag_data = [hs, carrier]
print(dpp_tag_data)
clf.connect(rdwr={'on-connect': rdwr_connected_write_tag})
def process_handover_request_message(self, records):
self.ho_server_processing = True
clear_raw_mode()
print("\nHandoverServer - request received: " + str(records))
carrier = None
hs = ndef.HandoverSelectRecord('1.4')
sel = [hs]
found = False
for carrier in records:
if isinstance(carrier, ndef.HandoverRequestRecord):
continue
print("Remote carrier type: " + carrier.type)
if carrier.type == "application/vnd.wfa.dpp":
print("DPP carrier type match - add DPP carrier record")
if len(carrier.data) == 0 or carrier.data[0] != 0:
print("URI Identifier Code 'None' not seen")
continue
uri = carrier.data[1:].decode("utf-8")
print("Received DPP URI: " + uri)
data = wpas_get_nfc_uri(start_listen=False)
print("Own URI (pre-processing): %s" % data)
res = wpas_report_handover_req(uri)
if res is None or "FAIL" in res:
print("DPP handover request processing failed")
continue
found = True
self.received_carrier = carrier
wpas = wpas_connect()
if wpas is None:
continue
global own_id
data = wpas.request("DPP_BOOTSTRAP_GET_URI %d" %
own_id).rstrip()
if "FAIL" in data:
continue
print("Own URI (post-processing): %s" % data)
uri = ndef.UriRecord(data)
print("Own bootstrapping NFC URI record: " + str(uri))
info = wpas.request("DPP_BOOTSTRAP_INFO %d" % own_id)
freq = None
for line in info.splitlines():
if line.startswith("use_freq="):
freq = int(line.split('=')[1])
if freq is None:
print("No channel negotiated over NFC - use channel 1")
freq = 2412
res = wpas.request("DPP_LISTEN %d" % freq)
if "OK" not in res:
print("Failed to start DPP listen")
break
carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data)
print("Own DPP carrier record: " + str(carrier))
hs.add_alternative_carrier('active', carrier.name)
sel = [hs, carrier]
break
summary("Sending handover select: " + str(sel))
if found:
self.success = True
else:
self.try_own = True
return sel
def process_handover_request_message(self, records):
self.ho_server_processing = True
global in_raw_mode
was_in_raw_mode = in_raw_mode
clear_raw_mode()
if was_in_raw_mode:
print("\n")
summary("HandoverServer - request received: " + str(records))
global my_crn, peer_crn, my_crn_ready
for carrier in records:
if not isinstance(carrier, ndef.HandoverRequestRecord):
continue
if carrier.collision_resolution_number:
peer_crn = carrier.collision_resolution_number
summary("peer_crn: %d" % peer_crn)
if my_crn is None and my_crn_ready:
summary(
"Still trying to send own handover request - wait a moment to see if that succeeds before checking crn values"
)
for i in range(10):
if my_crn is not None:
break
time.sleep(0.01)
if my_crn is not None:
summary("my_crn: %d" % my_crn)
if my_crn is not None and peer_crn is not None:
if my_crn == peer_crn:
summary(
"Same crn used - automatic collision resolution failed")
# TODO: Should generate a new Handover Request message
return ''
if ((my_crn & 1) == (peer_crn & 1) and my_crn > peer_crn) or \
((my_crn & 1) != (peer_crn & 1) and my_crn < peer_crn):
summary("I'm the Handover Selector Device")
pass
else:
summary("Peer is the Handover Selector device")
summary("Ignore the received request.")
return ''
hs = ndef.HandoverSelectRecord('1.4')
sel = [hs]
found = False
for carrier in records:
if isinstance(carrier, ndef.HandoverRequestRecord):
continue
summary("Remote carrier type: " + carrier.type)
if carrier.type == "application/vnd.wfa.dpp":
summary("DPP carrier type match - add DPP carrier record")
if len(carrier.data) == 0 or carrier.data[0] != 0:
summary("URI Identifier Code 'None' not seen")
continue
uri = carrier.data[1:].decode("utf-8")
summary("Received DPP URI: " + uri)
data = wpas_get_nfc_uri(start_listen=False, pick_channel=True)
summary("Own URI (pre-processing): %s" % data)
res = wpas_report_handover_req(uri)
if res is None or "FAIL" in res:
summary("DPP handover request processing failed")
continue
found = True
wpas = wpas_connect()
if wpas is None:
continue
global own_id
data = wpas.request("DPP_BOOTSTRAP_GET_URI %d" %
own_id).rstrip()
if "FAIL" in data:
continue
summary("Own URI (post-processing): %s" % data)
uri = ndef.UriRecord(data)
summary("Own bootstrapping NFC URI record: " + str(uri))
info = wpas.request("DPP_BOOTSTRAP_INFO %d" % own_id)
freq = None
for line in info.splitlines():
if line.startswith("use_freq="):
freq = int(line.split('=')[1])
if freq is None or freq == 0:
summary("No channel negotiated over NFC - use channel 6")
freq = 2437
else:
summary("Negotiated channel: %d MHz" % freq)
if get_status_field(wpas, "bssid[0]"):
summary("Own AP freq: %s MHz" %
str(get_status_field(wpas, "freq")))
if get_status_field(wpas, "beacon_set",
extra="DRIVER") is None:
summary("Enable beaconing to have radio ready for RX")
wpas.request("DISABLE")
wpas.request("SET start_disabled 0")
wpas.request("ENABLE")
cmd = "DPP_LISTEN %d" % freq
global enrollee_only
global configurator_only
if enrollee_only:
cmd += " role=enrollee"
elif configurator_only:
cmd += " role=configurator"
summary(cmd)
res = wpas.request(cmd)
if "OK" not in res:
summary("Failed to start DPP listen")
break
carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data)
summary("Own DPP carrier record: " + str(carrier))
hs.add_alternative_carrier('active', carrier.name)
sel = [hs, carrier]
break
summary("Sending handover select: " + str(sel))
if found:
self.success = True
else:
self.try_own = True
global hs_sent
hs_sent = True
return sel
@pytest.mark.parametrize("encoded, message", handover_request_messages)
def test_decode(self, encoded, message):
octets = bytes(bytearray.fromhex(encoded))
print(list(ndef.message_decoder(octets)))
assert list(ndef.message_decoder(octets)) == message
@pytest.mark.parametrize("encoded, message", handover_request_messages)
def test_encode(self, encoded, message):
octets = bytes(bytearray.fromhex(encoded))
print(list(ndef.message_encoder(message)))
assert b''.join(list(ndef.message_encoder(message))) == octets
handover_select_messages = [
('d102014873 13',
[ndef.HandoverSelectRecord('1.3')]),
('d102094873 13 d1030265727201ff',
[ndef.HandoverSelectRecord('1.3', (1, 255))]),
('91020a4873 13 d10204616301013100 5a030201612f62310001',
[ndef.HandoverSelectRecord('1.3', None, (1, '1')),
ndef.Record('a/b', '1', b'\x00\x01')]),
('9102124873 13 91020461630101310051030265727201ff 5a030201612f62310001',
[ndef.HandoverSelectRecord('1.3', (1, 255), (1, '1')),
ndef.Record('a/b', '1', b'\x00\x01')]),
]
class TestHandoverSelectMessage:
@pytest.mark.parametrize("encoded, message", handover_select_messages)
def test_decode(self, encoded, message):
octets = bytes(bytearray.fromhex(encoded))
def process_handover_request_message(self, records):
handover = self.handover
self.ho_server_processing = True
global in_raw_mode
was_in_raw_mode = in_raw_mode
clear_raw_mode()
if was_in_raw_mode:
print("\n")
summary("HandoverServer - request received: " + str(records))
for carrier in records:
if not isinstance(carrier, ndef.HandoverRequestRecord):
continue
if carrier.collision_resolution_number:
handover.peer_crn = carrier.collision_resolution_number
summary("peer_crn: %d" % handover.peer_crn)
if handover.my_crn is None and handover.my_crn_ready:
summary("Still trying to send own handover request - wait a moment to see if that succeeds before checking crn values")
for i in range(10):
if handover.my_crn is not None:
break
time.sleep(0.01)
if handover.my_crn is not None:
summary("my_crn: %d" % handover.my_crn)
if handover.my_crn is not None and handover.peer_crn is not None:
if handover.my_crn == handover.peer_crn:
summary("Same crn used - automatic collision resolution failed")
# TODO: Should generate a new Handover Request message
return ''
if ((handover.my_crn & 1) == (handover.peer_crn & 1) and \
handover.my_crn > handover.peer_crn) or \
((handover.my_crn & 1) != (handover.peer_crn & 1) and \
handover.my_crn < handover.peer_crn):
summary("I'm the Handover Selector Device")
handover.i_m_selector = True
else:
summary("Peer is the Handover Selector device")
summary("Ignore the received request.")
return ''
hs = ndef.HandoverSelectRecord('1.4')
sel = [hs]
found = False
for carrier in records:
if isinstance(carrier, ndef.HandoverRequestRecord):
continue
summary("Remote carrier type: " + carrier.type)
if carrier.type == "application/vnd.wfa.dpp":
summary("DPP carrier type match - add DPP carrier record")
if len(carrier.data) == 0 or carrier.data[0] != 0:
summary("URI Identifier Code 'None' not seen", color=C_RED)
continue
uri = carrier.data[1:].decode("utf-8")
summary("Received DPP URI: " + uri)
global test_uri, test_alt_uri
if test_uri:
summary("TEST MODE: Using specified URI")
data = test_sel_uri if test_sel_uri else test_uri
elif handover.alt_proposal and handover.altchanlist:
summary("Use alternative channel list while processing alternative proposal from peer")
data = wpas_get_nfc_uri(start_listen=False,
chan_override=handover.altchanlist,
pick_channel=True)
else:
data = wpas_get_nfc_uri(start_listen=False,
pick_channel=True)
summary("Own URI (pre-processing): %s" % data)
if test_uri:
summary("TEST MODE: Fake processing")
res = "OK"
data += " [%s]" % uri
else:
res = wpas_report_handover_req(uri)
if res is None or "FAIL" in res:
summary("DPP handover request processing failed",
color=C_RED)
if handover.altchanlist:
data = wpas_get_nfc_uri(start_listen=False,
chan_override=handover.altchanlist)
summary("Own URI (try another channel list): %s" % data)
continue
if test_alt_uri:
summary("TEST MODE: Reject initial proposal")
continue
found = True
if not test_uri:
wpas = wpas_connect()
if wpas is None:
continue
global own_id
data = wpas.request("DPP_BOOTSTRAP_GET_URI %d" % own_id).rstrip()
if "FAIL" in data:
continue
summary("Own URI (post-processing): %s" % data)
handover.my_uri = data
handover.peer_uri = uri
uri = ndef.UriRecord(data)
summary("Own bootstrapping NFC URI record: " + str(uri))
if not test_uri:
info = wpas.request("DPP_BOOTSTRAP_INFO %d" % own_id)
freq = None
for line in info.splitlines():
if line.startswith("use_freq="):
freq = int(line.split('=')[1])
if freq is None or freq == 0:
summary("No channel negotiated over NFC - use channel 6")
freq = 2437
else:
summary("Negotiated channel: %d MHz" % freq)
if not dpp_start_listen(wpas, freq):
break
carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data)
summary("Own DPP carrier record: " + str(carrier))
hs.add_alternative_carrier('active', carrier.name)
sel = [hs, carrier]
break
summary("Sending handover select: " + str(sel))
if found:
summary("Handover completed successfully")
handover.terminate_on_hs_send_completion = True
self.success = True
handover.hs_sent = True
handover.i_m_selector = True
elif handover.no_alt_proposal:
summary("Do not try alternative proposal anymore - handover failed",
color=C_RED)
handover.hs_sent = True
else:
summary("Try to initiate with alternative parameters")
handover.try_own = True
handover.hs_sent = False
handover.no_alt_proposal = True
if handover.client_thread:
handover.start_client_alt = True
else:
handover.client_thread = threading.Thread(target=llcp_worker,
args=(self.llc, True))
handover.client_thread.start()
return sel
