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#!/usr/bin/python3
# Copyright (c) 2017-2019 David Steele <dsteele@gmail.com>
#
# SPDX-License-Identifier: GPL-2.0-or-later
# License-Filename: LICENSE
import logging
import subprocess
import re
from multiprocessing import Process, Queue
log = logging.getLogger("comitup")
# NetworkManager is doing a poor job of maintaining the AP scan list when
# in AP mode. Use the 'iw' command to get the AP list.
def docmd(cmd):
cmd = "timeout 5 " + cmd
try:
out = subprocess.check_output(cmd.split()).decode()
except subprocess.CalledProcessError:
out = ""
return out
def devlist():
"""Get a list of supported devices from 'iw'"""
log.debug("Getting device list from 'iw'")
out = docmd("iw dev")
devs = [x.split()[1] for x in out.split('\n') if "Interface" in x]
return devs
def blk2dict(blk):
"""Convert a 'iw dev scan' block into a tagged dict"""
lines = [x.strip().split(':') for x in blk.split('\n') if ':' in x]
tups = [(x[0].strip(), x[1].strip()) for x in lines if len(x) > 1]
return dict(tups)
def dbm2pct(dbm):
pct = (dbm + 100.0) * 2
pct = max(0, pct)
pct = min(100, pct)
return str(pct)
def devaps(dev, dump=""):
"""Get a list of Access Points (as dicts) for a device"""
if not dump:
log.debug("Getting AP list from 'iw' dev %s" % dev)
dump = docmd('iw dev %s scan' % dev)
aps = []
for blk in re.split('\nBSS ', dump[4:]):
try:
ap = blk2dict(blk)
ap['power'] = dbm2pct(float(ap['signal'].split()[0]))
if ap['SSID']:
aps.append(ap)
except KeyError:
pass
return aps
def apgen(dev, q, dump=""):
for ap in devaps(dev, dump):
pt = {}
pt['ssid'] = ap['SSID']
pt['strength'] = ap['power']
if 'WPA' in ap or 'RSN' in ap:
pt['security'] = 'encrypted'
else:
pt['security'] = 'unencrypted'
q.put(pt)
q.put("DONE")
def dedup_aplist(aplist):
apdict = {x['ssid']: x for x in aplist}
return [apdict[x] for x in apdict]
def candidates(device=None):
"""Return a list of reachable Access Point SSIDs, sorted by power"""
if device:
dev_list = [device]
else:
dev_list = devlist()
jobs = []
q = Queue()
for dev in dev_list:
p = Process(target=apgen, args=(dev, q))
p.start()
jobs.append(p)
clist = []
donecount = 0
while donecount < len(jobs):
pt = q.get()
if pt == "DONE":
donecount += 1
else:
clist.append(pt)
for p in jobs:
p.join()
clist = dedup_aplist(clist)
clist = sorted(clist, key=lambda x: -float(x['strength']))
return clist
def ap_conn_count():
count = 0
for dev in devlist():
log.debug("Getting iw station dump")
out = docmd('iw dev %s station dump' % dev)
count += len([x for x in out.split('\n') if "Station" in x])
return count
if __name__ == '__main__':
print(candidates())
print(ap_conn_count())
import sys
for ap in devaps(sys.argv[1], sys.stdin.read()):
print(ap["SSID"], ap["RSN"], ap["power"], "RSN" in ap)
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