112 lines
3.5 KiB
Nix
112 lines
3.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with import <stockholm/lib>;
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let
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cfg = config.lass.autowifi;
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in {
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options.lass.autowifi = {
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enable = mkEnableOption "automatic wifi connector";
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knownWifisFile = mkOption {
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type = types.str;
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default = "/etc/wifis";
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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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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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};
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};
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};
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}
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