def shutdown(self):
if self.device:
nfc.close(self.device)
self.device = None
if self.context:
nfc.exit(self.context)
self.context = None
def nfc_open(connstring=_connstring):
"""Open the PN532 for reading.
Use this like so:
with reader.nfc_open() as device:
do_stuff_with_device(device)
Automatically takes care of closing the connection for you.
Fun fact: you can (and should) do this with regular file open() as well.
"""
ctx = nfc.init()
if ctx is None:
raise RuntimeError('Couldn\'t init libnfc')
device = nfc.open(ctx, connstring)
if device is None:
raise NFCError('Couldn\'t open NFC device', {'connstring': connstring})
try:
if nfc.initiator_init(device) < 0:
raise NFCError('Couldn\'t init NFC device',
{'connstring': connstring})
yield device
finally:
# cleanup...
nfc.close(device)
nfc.exit(ctx)
def get_tag():
context = nfc.init()
pnd = nfc.open(context)
if pnd is None:
print('ERROR: Unable to open NFC device.')
exit()
if nfc.initiator_init(pnd) < 0:
nfc.perror(pnd, "nfc_initiator_init")
print('ERROR: Unable to init NFC device.')
exit()
# Declare modulations
nmMifare = nfc.modulation()
nmMifare.nmt = nfc.NMT_ISO14443A
nmMifare.nbr = nfc.NBR_106
nt = nfc.target()
# Wait for tag
ret = nfc.initiator_select_passive_target(pnd, nmMifare, 0, 0, nt)
# Convert raw uid to hex, then trim to length (2*nt.nti.nai.szUidLen)
tag = ''.join(format(x, '02x') for x in nt.nti.nai.abtUid)[:2*nt.nti.nai.szUidLen]
nfc.close(pnd)
nfc.exit(context)
# Return UID
return tag
def init_reader(callback):
context = nfc.init()
devs = nfc.list_devices(context, 16)
if devs:
for dev in devs:
pnd = nfc.open(context, dev)
if pnd:
if nfc.initiator_init(pnd) < 0:
nfc.perror(pnd, "nfc_initator_init")
nfc.close(pnd)
else:
reader = NFCReader(context, pnd, callback)
reader.daemon = True
reader.start()
else:
print("failed to find a NFC device")
def init_reader(callback):
context = nfc.init()
devs = nfc.list_devices(context, 16)
if devs:
for dev in devs:
pnd = nfc.open(context, dev)
if pnd:
if nfc.initiator_init(pnd) < 0:
nfc.perror(pnd, "nfc_initator_init")
nfc.close(pnd)
else:
reader = NFCReader(context, pnd, callback)
reader.daemon = True
reader.start()
else:
print("failed to find a NFC device")
def close():
nfc.close(pnd)
nfc.exit(context)
if (nfc.writeHash(new_hash[0])):
# Update database
remoteDB.update_hash(card_id, new_hash[1])
else:
# Set fault bit on card
remoteDB.update_hash(card_id, card[1], 1)
ledUpdate("bad hash")
return False
# Check for access
access_status = localDB.check_valid_access(card_id, remoteDB)
if (access_status != True):
ledUpdate(access_status)
return False
else:
# Log Success
#db_log(cardData[0],cardData[1],"Access Granted")
#log("Access Granted: Card ID=%s User ID=%s" % (card_id,cardData[1]))
# Open Door
open_door(unlocked)
return True
# Main
init()
while (1):
if poll() is None:
time.sleep(1)
print "Exited while(1)? We must be done?"
nfc.close()
return
if __name__ == '__main__':
# Reset the default Crtl-C behavior
import signal
try:
signal.signal(signal.SIGINT, signal.SIG_DFL)
except ValueError:
pass
print('Version: ', nfc.__version__)
while (1):
context = nfc.init()
if not context:
print("Unable to init libnfc (malloc)\n");
sys.exit(1)
nfcInitListen()
nfcProtocol()
nfc.close(pnd)
nfc.exit(context)
time.sleep(2)
print("\nstarting again...\n")
sys.exit(0)
def clean_up():
nfc.close(pnd)
nfc.exit(context)
conn.close()
nfc.exit(context)
exit()
print("NFC device: %s opened" % nfc.device_get_name(pnd))
#signal(SIGINT, stop_dep_communication);
print("NFC device will now act as: ")
#print_nfc_target(&nt, false)
print("Waiting for initiator request...")
abtRx = nfc.target_init(pnd, nt, MAX_FRAME_LEN, 0)
szRx = len(abtRx)
if szRx < 0:
nfc.perror(pnd, "nfc_target_init")
nfc.close(pnd)
nfc.exit(context)
exit()
print("Initiator request received. Waiting for data...\n")
abtRx = nfc.target_receive_bytes(pnd, MAX_FRAME_LEN, 0)
szRx = len(abtRx)
if szRx < 0:
nfc.perror(pnd, "nfc_target_receive_bytes")
nfc.close(pnd)
nfc.exit(context)
exit()
#abtRx[szRx] = '\0'
print("Received: %s\n", abtRx)
new_hash = nfc.generateNewHash(card[1])
if (nfc.writeHash(new_hash[0])):
# Update database
remoteDB.update_hash(card_id,new_hash[1])
else:
# Set fault bit on card
remoteDB.update_hash(card_id,card[1],1)
ledUpdate("bad hash")
return False
# Check for access
access_status = localDB.check_valid_access(card_id, remoteDB)
if (access_status != True):
ledUpdate(access_status)
return False
else:
# Log Success
#db_log(cardData[0],cardData[1],"Access Granted")
#log("Access Granted: Card ID=%s User ID=%s" % (card_id,cardData[1]))
# Open Door
open_door(unlocked)
return True
# Main
init()
while(1):
if poll() is None:
time.sleep(1)
print "Exited while(1)? We must be done?"
nfc.close()
def close(): nfc.close(pnd) nfc.exit(context)
