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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 re
import struct
import subprocess
from multiprocessing import Process, Queue
from typing import Dict, List, Optional
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: str) -> str:
cmd = "timeout 5 " + cmd
try:
out = subprocess.check_output(
cmd.split(), encoding="utf-8", stderr=subprocess.PIPE
)
except subprocess.CalledProcessError:
out = ""
return out
def devlist() -> List[str]:
"""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: str) -> Dict[str, str]:
"""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: float) -> str:
pct = (dbm + 100.0) * 2
pct = max(0, pct)
pct = min(100, pct)
return str(pct)
def decode_x(s: str) -> str:
"""Take a unicode string of the form "b\xc3\xbct" and fix it"""
s = re.sub("\x00", "", s, count=0, flags=re.I)
s = re.sub("'", "\\'", s, count=0, flags=re.I)
s = eval("'{}'".format(s))
outlist = []
for cp in s:
num = ord(cp)
if num < 255:
outlist.append(struct.pack("B", num))
elif num < 65535:
outlist.append(struct.pack(">H", num))
else:
b = (num & 0xFF0000) >> 16
H = num & 0xFFFF
outlist.append(struct.pack(">bH", b, H))
blist = b"".join(outlist)
return blist.decode("utf-8")
def devaps(dev: str, dump: str = "") -> List[Dict[str, str]]:
"""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"] and ap["SSID"].count(r"\x00") == 0:
ap["SSID"] = decode_x(ap["SSID"])
aps.append(ap)
except KeyError:
pass
return aps
def apgen(dev: str, q: Queue, dump: str = "") -> None:
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: List[Dict[str, str]]) -> List[Dict[str, str]]:
apdict = {x["ssid"]: x for x in aplist}
return [apdict[x] for x in apdict]
def candidates(device: Optional[str] = None) -> List[Dict[str, str]]:
"""Return a list of reachable Access Point SSIDs, sorted by power"""
if device:
dev_list = [device]
else:
dev_list = devlist()
jobs = []
q: Queue = 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() -> int:
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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