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authorlassulus <lassulus@lassul.us>2019-08-28 23:02:53 +0200
committerlassulus <lassulus@lassul.us>2019-08-28 23:02:53 +0200
commit3072db3795166d62961a4d2f73a54a03de5ff955 (patch)
tree1274eda1905b3054c94d8686de7e7cd4bd45384d
parentc0e4269e6a6518b6a648d250c437b59460caa6e9 (diff)
l: add autowifi service
-rw-r--r--lass/3modules/autowifi.nix111
-rw-r--r--lass/3modules/default.nix1
2 files changed, 112 insertions, 0 deletions
diff --git a/lass/3modules/autowifi.nix b/lass/3modules/autowifi.nix
new file mode 100644
index 00000000..930d9972
--- /dev/null
+++ b/lass/3modules/autowifi.nix
@@ -0,0 +1,111 @@
+{ config, lib, pkgs, ... }:
+with import <stockholm/lib>;
+let
+
+ cfg = config.lass.autowifi;
+
+in {
+ options.lass.autowifi = {
+ enable = mkEnableOption "automatic wifi connector";
+ knownWifisFile = mkOption {
+ type = types.str;
+ default = "/etc/wifis";
+ };
+ };
+
+ config = {
+ systemd.services.autowifi = {
+ description = "Automatic wifi connector";
+ wantedBy = [ "multi-user.target" ];
+ serviceConfig = {
+ Type = "simple";
+ Restart = "always";
+ RestartSec = "10s";
+ ExecStart = pkgs.writers.writePython3 "autowifi" {} /* python3 */ ''
+ import subprocess
+ import time
+ import urllib.request
+
+
+ def connect(ssid, psk=None):
+ subprocess.run(["${pkgs.networkmanager}/bin/nmcli", "connection", "delete", "autowifi"])
+ print("connecting to {}".format(ssid))
+ if psk is None:
+ subprocess.run(["${pkgs.networkmanager}/bin/nmcli", "device", "wifi", "connect", ssid, "name", "autowifi"])
+ else:
+ subprocess.run(["${pkgs.networkmanager}/bin/nmcli", "device", "wifi", "connect", ssid, "name", "autowifi", "password", psk])
+
+
+ def scan():
+ wifis_raw = subprocess.check_output(["${pkgs.networkmanager}/bin/nmcli", "-t", "device", "wifi", "list", "--rescan", "yes"])
+ wifis_list = wifis_raw.split(b'\n')
+ wifis = []
+ for line in wifis_list:
+ 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('${cfg.knownWifisFile}') 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_internet():
+ try:
+ beacon = urllib.request.urlopen('http://krebsco.de/secret')
+ except: # noqa
+ print("no internet")
+ return False
+ if beacon.read() == b'1337\n':
+ return True
+ print("no internet")
+ 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 bloop():
+ while True:
+ if not check_internet():
+ 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_internet():
+ continue
+ open_wifis = filter(is_wifi_open, wifis)
+ for wifi in open_wifis:
+ connect(wifi['ssid'])
+ if check_internet():
+ continue
+ time.sleep(10)
+
+
+ bloop()
+ '';
+ };
+ };
+ };
+}
+
diff --git a/lass/3modules/default.nix b/lass/3modules/default.nix
index 613c7c8a..1195cd3d 100644
--- a/lass/3modules/default.nix
+++ b/lass/3modules/default.nix
@@ -14,5 +14,6 @@ _:
./umts.nix
./usershadow.nix
./xjail.nix
+ ./autowifi.nix
];
}