l autowifi: move into package, make more robust
This commit is contained in:
lassulus
parent
c9bea3113c
commit
c7a58bbd21
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@ -11,101 +11,28 @@ in {
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type = types.str;
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default = "/etc/wifis";
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};
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enablePrisonBreak = mkOption {
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type = types.bool;
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default = false;
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};
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};
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config = lib.mkIf cfg.enable {
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systemd.services.autowifi = {
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description = "Automatic wifi connector";
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wantedBy = [ "multi-user.target" ];
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path = [ pkgs.networkmanager ];
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serviceConfig = {
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Type = "simple";
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Restart = "always";
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RestartSec = "10s";
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ExecStart = pkgs.writers.writePython3 "autowifi" {} /* python3 */ ''
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import subprocess
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import time
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import urllib.request
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def connect(ssid, psk=None):
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subprocess.run(["${pkgs.networkmanager}/bin/nmcli", "connection", "delete", "autowifi"])
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print("connecting to {}".format(ssid))
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if psk is None:
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subprocess.run(["${pkgs.networkmanager}/bin/nmcli", "device", "wifi", "connect", ssid, "name", "autowifi"])
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else:
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subprocess.run(["${pkgs.networkmanager}/bin/nmcli", "device", "wifi", "connect", ssid, "name", "autowifi", "password", psk])
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def scan():
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wifis_raw = subprocess.check_output(["${pkgs.networkmanager}/bin/nmcli", "-t", "device", "wifi", "list", "--rescan", "yes"])
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wifis_list = wifis_raw.split(b'\n')
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wifis = []
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for line in wifis_list:
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ls = line.split(b':')
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if len(ls) == 8:
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wifis.append({"ssid": ls[1], "signal": int(ls[5]), "crypto": ls[7]})
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return wifis
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def get_known_wifis():
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wifis_lines = []
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with open('${cfg.knownWifisFile}') as f:
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wifis_lines = f.read().splitlines()
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wifis = []
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for line in wifis_lines:
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ls = line.split(':')
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wifis.append({"ssid": ls[0].encode(), "psk": ls[1].encode()})
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return wifis
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def check_internet():
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try:
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beacon = urllib.request.urlopen('http://krebsco.de/secret')
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except: # noqa
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print("no internet")
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return False
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if beacon.read() == b'1337\n':
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return True
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print("no internet")
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return False
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def is_wifi_open(wifi):
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if wifi['crypto'] == ${"b''"}:
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return True
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else:
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return False
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def is_wifi_seen(wifi, seen_wifis):
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for seen_wifi in seen_wifis:
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if seen_wifi["ssid"] == wifi["ssid"]:
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return True
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return False
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def bloop():
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while True:
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if not check_internet():
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wifis = scan()
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known_wifis = get_known_wifis()
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known_seen_wifis = [wifi for wifi in known_wifis if is_wifi_seen(wifi, wifis)]
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for wifi in known_seen_wifis:
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connect(wifi['ssid'], wifi['psk'])
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if check_internet():
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continue
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open_wifis = filter(is_wifi_open, wifis)
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for wifi in open_wifis:
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connect(wifi['ssid'])
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if check_internet():
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continue
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time.sleep(10)
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bloop()
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'';
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ExecStart = "${autowifi}/bin/autowifi";
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};
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};
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networking.networkmanager.dispatcherScripts = mkIf cfg.enablePrisonBreak [
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{ source = "${pkgs.callPackage <stockholm/makefu/5pkgs/prison-break}/bin/prison-break"; }
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];
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};
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}
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@ -0,0 +1,228 @@
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import subprocess
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import time
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import urllib.request
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import logging
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import argparse
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import socket
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import struct
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import signal
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import os
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wifiDB = ''
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logger = logging.getLogger()
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got_signal = False
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def signal_handler(signum, frame):
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global got_signal
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got_signal = True
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def get_default_gateway() -> str:
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"""Read the default gateway directly from /proc."""
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with open("/proc/net/route") as fh:
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for line in fh:
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fields = line.strip().split()
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if fields[1] != '00000000' or not int(fields[3], 16) & 2:
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continue
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return socket.inet_ntoa(struct.pack("<L", int(fields[2], 16)))
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def connect(ssid, psk=None):
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subprocess.run(
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["nmcli", "connection", "delete", "autowifi"],
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stdout=subprocess.PIPE,
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)
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logging.info('connecting to %s', ssid)
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if psk is None:
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subprocess.run(
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[
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"nmcli",
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"device",
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"wifi",
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"connect",
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ssid,
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"name",
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"autowifi",
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],
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stdout=subprocess.PIPE,
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)
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else:
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subprocess.run(
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[
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"nmcli",
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"device",
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"wifi",
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"connect",
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ssid,
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"name",
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"autowifi",
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"password",
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psk,
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],
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stdout=subprocess.PIPE,
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)
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time.sleep(5)
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def scan():
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logging.debug('scanning wifis')
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wifis_raw = subprocess.check_output([
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"nmcli",
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"-t",
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"device",
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"wifi",
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"list",
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"--rescan",
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"yes",
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])
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wifis_list = wifis_raw.split(b'\n')
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logging.debug('scanning wifis finished')
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wifis = []
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for line in wifis_list:
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logging.debug(line)
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ls = line.split(b':')
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if len(ls) == 8:
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wifis.append({
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"ssid": ls[1],
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"signal": int(ls[5]),
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"crypto": ls[7]
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})
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return wifis
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def get_known_wifis():
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wifis_lines = []
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with open(wifiDB) as f:
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wifis_lines = f.read().splitlines()
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wifis = []
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for line in wifis_lines:
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ls = line.split('/')
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wifis.append({"ssid": ls[0].encode(), "psk": ls[1].encode()})
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return wifis
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def check_network():
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logging.debug('checking network')
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global got_signal
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if got_signal:
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logging.info('got disconnect signal')
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got_signal = False
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return False
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else:
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gateway = get_default_gateway()
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if gateway:
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response = subprocess.run(
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[
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'ping',
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'-q',
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'-c',
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'1',
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gateway,
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],
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stdout=subprocess.PIPE,
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)
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if response.returncode == 0:
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logging.debug('host %s is up', gateway)
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return True
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else:
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logging.debug('host %s is down', gateway)
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return False
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else:
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logging.debug('no gateway')
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return False
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def check_internet():
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logging.debug('checking internet')
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try:
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with open('./dummy_internet') as f:
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dummy_content = f.read()
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if dummy_content == 'xxx\n':
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return True
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beacon = urllib.request.urlopen('http://krebsco.de/secret')
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except Exception as e: # noqa
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logging.debug(e)
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logging.info('no internet exc')
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return False
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if beacon.read() == b'1337\n':
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return True
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logging.info('no internet oh')
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return False
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def is_wifi_open(wifi):
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if wifi['crypto'] == b'':
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return True
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else:
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return False
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def is_wifi_seen(wifi, seen_wifis):
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for seen_wifi in seen_wifis:
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if seen_wifi["ssid"] == wifi["ssid"]:
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return True
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return False
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument(
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'-c', '--config',
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dest='config',
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help='wifi config file to use',
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default='/etc/wifis',
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)
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parser.add_argument(
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'-l', '--loglevel',
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dest='loglevel',
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help='loglevel to use',
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default=logging.INFO,
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)
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parser.add_argument(
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'-p', '--pidfile',
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dest='pidfile',
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help='file to write the pid to',
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default=None,
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)
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args = parser.parse_args()
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global wifiDB
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wifiDB = args.config
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logger.setLevel(args.loglevel)
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signal.signal(signal.SIGUSR1, signal_handler)
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if args.pidfile:
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with open(args.pidfile, 'w+') as f:
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f.write(str(os.getpid()))
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while True:
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if not check_network():
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wifis = scan()
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known_wifis = get_known_wifis()
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known_seen_wifis = [
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wifi for wifi in known_wifis if is_wifi_seen(wifi, wifis)
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]
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for wifi in known_seen_wifis:
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connect(wifi['ssid'], wifi['psk'])
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if check_network():
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break
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open_wifis = filter(is_wifi_open, wifis)
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for wifi in open_wifis:
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connect(wifi['ssid'])
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if check_network():
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break
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time.sleep(10)
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if __name__ == '__main__':
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main()
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@ -0,0 +1 @@
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pkgs.writers.writePython3Bin "autowifi" {} ./autowifi.py
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