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lrr_wiegand_listener.py
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lrr_wiegand_listener.py
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#!/usr/bin/python
#############################################################################
# Long Range Reader Wiegand Listener/Decoder
# By: Dennis Linuz <dennismald@gmail.com>
#
#
#############################################################################
import pigpio
# The magic code to decode wiegand data from the wiegand data lines. Borrowed from http://abyz.co.uk/rpi/pigpio/examples.html
class decoder:
def __init__(self, pi, gpio_0, gpio_1, callback, bit_timeout=5):
"""
Instantiate with the pi, gpio for 0 (green wire), the gpio for 1
(white wire), the callback function, and the bit timeout in
milliseconds which indicates the end of a code.
The callback is passed the code length in bits and the value.
"""
self.pi = pi
self.gpio_0 = gpio_0
self.gpio_1 = gpio_1
self.callback = callback
self.bit_timeout = bit_timeout
self.in_code = False
self.pi.set_mode(gpio_0, pigpio.INPUT)
self.pi.set_mode(gpio_1, pigpio.INPUT)
self.pi.set_pull_up_down(gpio_0, pigpio.PUD_UP)
self.pi.set_pull_up_down(gpio_1, pigpio.PUD_UP)
self.cb_0 = self.pi.callback(gpio_0, pigpio.FALLING_EDGE, self._cb)
self.cb_1 = self.pi.callback(gpio_1, pigpio.FALLING_EDGE, self._cb)
def _cb(self, gpio, level, tick):
"""
Accumulate bits until both gpios 0 and 1 timeout.
"""
if level < pigpio.TIMEOUT:
if self.in_code == False:
self.bits = 1
self.num = 0
self.in_code = True
self.code_timeout = 0
self.pi.set_watchdog(self.gpio_0, self.bit_timeout)
self.pi.set_watchdog(self.gpio_1, self.bit_timeout)
else:
self.bits += 1
self.num = self.num << 1
if gpio == self.gpio_0:
self.code_timeout = self.code_timeout & 2 # clear gpio 0 timeout
else:
self.code_timeout = self.code_timeout & 1 # clear gpio 1 timeout
self.num = self.num | 1
else:
if self.in_code:
if gpio == self.gpio_0:
self.code_timeout = self.code_timeout | 1 # timeout gpio 0
else:
self.code_timeout = self.code_timeout | 2 # timeout gpio 1
if self.code_timeout == 3: # both gpios timed out
self.pi.set_watchdog(self.gpio_0, 0)
self.pi.set_watchdog(self.gpio_1, 0)
self.in_code = False
self.callback(self.bits, self.num)
def cancel(self):
"""
Cancel the Wiegand decoder.
"""
self.cb_0.cancel()
self.cb_1.cancel()
if __name__ == "__main__":
import time
import pigpio
import lrr_wiegand_listener
import os
import csv
print "Starting Wiegand listener..."
CARDS_CSV_FILE = "cards.csv"
id_num = 0
# Command for using expect script on sattilite device to automagically write cloned RFID cards
# Currently broken, will hang up the script, not allowing for more than 2 cards to be processed at any one time
def cmdProxmark(wiegand_hex):
os.system('ssh -t dennis@192.168.3.10 "/home/dennis/proxmark.exp /dev/ttyACM0 lf ' + wiegand_hex + '"')
# Creates CSV file if one doesn't exist. Will also grab the ID of the last record
def validateCSV(file):
global id_num
if not os.path.exists(file):
print "[!] No cards.csv found! Creating one..."
with open(file, 'w') as csvfile:
fieldnames = ['id', 'bit_length', 'wiegand_binary', 'wiegand_hex', 'iclass_std_enc_hex', 'fac_code',
'card_num', 'card_num_no_fac']
csvwriter = csv.DictWriter(csvfile, lineterminator='\n', fieldnames=fieldnames)
csvwriter.writeheader()
print "[*] cards.csv created!"
else:
with open(file, 'r') as csvfile:
if not ("wiegand_binary" in csvfile.readline()):
print "[!] Invalid CSV file!"
quit()
# Get ID of last record
with open(file, 'r') as csvfile:
for lastrow in csv.reader(csvfile): pass
id_num = lastrow[0]
if not (id_num.isdigit()):
id_num = 0
# Add scanned cards to CSV file
def addCardsToCSV(bits, wiegand_binary, wiegand_hex, enc_hex, fac_code, card_num, card_num_no_fac):
global id_num
if fac_code == "-1": fac_code = "NA"
if card_num == "-1": card_num = "NA"
if card_num_no_fac == "-1": card_num_no_fac = "NA"
validateCSV(CARDS_CSV_FILE)
id_num = int(id_num) + 1
with open(CARDS_CSV_FILE, 'a+') as csvfile:
csvwriter = csv.writer(csvfile, lineterminator='\n')
csvwriter.writerow(
[id_num, bits, wiegand_binary, wiegand_hex, enc_hex, fac_code, card_num, card_num_no_fac])
os.system("sync")
print "[*] Added to cards.csv"
# Decodes the wiegand data based on the bitlength (bits)
def decodeWiegandData(bits, wiegand):
if bits == "26":
head = "0000000100000000001"
fc = int(wiegand[1:9], 2)
cn = int(wiegand[9:25], 2)
cn2 = int(wiegand[1:25], 2)
elif bits == "35":
head = "0000000101"
fc = int(wiegand[2:14], 2)
cn = int(wiegand[14:34], 2)
cn2 = int(wiegand[2:34], 2)
elif bits == "37":
head = "00000000"
fc = int(wiegand[1:17], 2)
cn = int(wiegand[17:36], 2)
cn2 = int(wiegand[1:36], 2)
else:
head = "0"
fc = -1
cn = -1
cn2 = -1
return str(fc), str(cn), str(cn2), str(head)
# The actual code that runs every time a card is scanned. Grabs data from, formats it appropriately, and writes to CSV file as well as prints the output to console
def callback(bits, value):
bits = str(bits)
wiegand_binary = format(value, '0' + bits + 'b')
fac_code, card_num, card_num_no_fac, hidHeader = decodeWiegandData(bits, wiegand_binary)
wiegand_binary = hidHeader + wiegand_binary
wiegand_hex = "%016X" % int(wiegand_binary, 2)
enc_hex = "FFFFFFFFFFFFFFFF".upper() # To Implement
addCardsToCSV(bits, wiegand_binary, wiegand_hex, enc_hex, fac_code, card_num, card_num_no_fac)
# Debug output to console
print "Bit Length: " + bits
print "Facility Code: " + fac_code
print "Card Number: " + card_num
print "Card Number without Facility Code: " + card_num_no_fac
print "Wiegand Data: " + wiegand_binary
print "Wiegand Hex Data: " + wiegand_hex
print "iCLASS Standard Encrypted Hex Data: " + enc_hex
# cmdProxmark(wiegand_hex)
# Create CSV file on boot if one does not exist
validateCSV(CARDS_CSV_FILE)
# Initialize pigpio and start the wiegand decoder, listening for Data0 and Data1 on pins 14 and 15, respectively
pi = pigpio.pi()
w = lrr_wiegand_listener.decoder(pi, 14, 15, callback)
# Keep the script running until it is manually stopped with Control+C or killed
while True:
raw_input()
w.cancel()
pi.stop()