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import subprocess
import time
import urllib.request
import logging
import argparse
import socket
import struct
import signal
import os
wifiDB = ''
logger = logging.getLogger()
got_signal = False
def signal_handler(signum, frame):
global got_signal
got_signal = True
def get_default_gateway() -> str:
"""Read the default gateway directly from /proc."""
with open("/proc/net/route") as fh:
for line in fh:
fields = line.strip().split()
if fields[1] != '00000000' or not int(fields[3], 16) & 2:
continue
return socket.inet_ntoa(struct.pack("<L", int(fields[2], 16)))
def connect(ssid, psk=None):
subprocess.run(
["nmcli", "connection", "delete", "autowifi"],
stdout=subprocess.PIPE,
)
logging.info('connecting to %s', ssid)
if psk is None:
subprocess.run(
[
"nmcli",
"device",
"wifi",
"connect",
ssid,
"name",
"autowifi",
],
stdout=subprocess.PIPE,
)
else:
subprocess.run(
[
"nmcli",
"device",
"wifi",
"connect",
ssid,
"name",
"autowifi",
"password",
psk,
],
stdout=subprocess.PIPE,
)
time.sleep(5)
def scan():
logging.debug('scanning wifis')
wifis_raw = subprocess.check_output([
"nmcli",
"-t",
"device",
"wifi",
"list",
"--rescan",
"yes",
])
wifis_list = wifis_raw.split(b'\n')
logging.debug('scanning wifis finished')
wifis = []
for line in wifis_list:
logging.debug(line)
ls = line.split(b':')
if len(ls) == 8:
wifis.append({
"ssid": ls[1],
"signal": int(ls[5]),
"crypto": ls[7]
})
return wifis
def get_known_wifis():
wifis_lines = []
with open(wifiDB) as f:
wifis_lines = f.read().splitlines()
wifis = []
for line in wifis_lines:
ls = line.split('/')
wifis.append({"ssid": ls[0].encode(), "psk": ls[1].encode()})
return wifis
def check_network():
logging.debug('checking network')
global got_signal
if got_signal:
logging.info('got disconnect signal')
got_signal = False
return False
else:
gateway = get_default_gateway()
if gateway:
response = subprocess.run(
[
'ping',
'-q',
'-c',
'1',
gateway,
],
stdout=subprocess.PIPE,
)
if response.returncode == 0:
logging.debug('host %s is up', gateway)
return True
else:
logging.debug('host %s is down', gateway)
return False
else:
logging.debug('no gateway')
return False
def check_internet():
logging.debug('checking internet')
try:
with open('./dummy_internet') as f:
dummy_content = f.read()
if dummy_content == 'xxx\n':
return True
beacon = urllib.request.urlopen('http://krebsco.de/secret')
except Exception as e: # noqa
logging.debug(e)
logging.info('no internet exc')
return False
if beacon.read() == b'1337\n':
return True
logging.info('no internet oh')
return False
def is_wifi_open(wifi):
if wifi['crypto'] == b'':
return True
else:
return False
def is_wifi_seen(wifi, seen_wifis):
for seen_wifi in seen_wifis:
if seen_wifi["ssid"] == wifi["ssid"]:
return True
return False
def main():
parser = argparse.ArgumentParser()
parser.add_argument(
'-c', '--config',
dest='config',
help='wifi config file to use',
default='/etc/wifis',
)
parser.add_argument(
'-l', '--loglevel',
dest='loglevel',
help='loglevel to use',
default=logging.INFO,
)
parser.add_argument(
'-p', '--pidfile',
dest='pidfile',
help='file to write the pid to',
default=None,
)
args = parser.parse_args()
global wifiDB
wifiDB = args.config
logger.setLevel(args.loglevel)
signal.signal(signal.SIGUSR1, signal_handler)
if args.pidfile:
with open(args.pidfile, 'w+') as f:
f.write(str(os.getpid()))
while True:
if not check_network():
wifis = scan()
known_wifis = get_known_wifis()
known_seen_wifis = [
wifi for wifi in known_wifis if is_wifi_seen(wifi, wifis)
]
for wifi in known_seen_wifis:
connect(wifi['ssid'], wifi['psk'])
if check_network():
break
open_wifis = filter(is_wifi_open, wifis)
for wifi in open_wifis:
connect(wifi['ssid'])
if check_network():
break
time.sleep(10)
if __name__ == '__main__':
main()
|
