Initial router DynDNS service

router_dyndns/cli.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+import argparse
+
+from .ddns import DdnsSettings, make_app
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(prog="router-dyndns")
+    subparsers = parser.add_subparsers(dest="command", required=True)
+
+    render_url = subparsers.add_parser("render-fritz-url", help="Render a FRITZ!Box custom DynDNS update URL.")
+    render_url.add_argument("--base-url", required=True, help="Public base URL of this DDNS service.")
+    render_url.add_argument("--host", required=True, help="DNS hostname configured in FRITZ!Box.")
+    render_url.add_argument("--include-ipv6", action="store_true")
+
+    serve = subparsers.add_parser("serve", help="Run the DDNS HTTP service.")
+    serve.add_argument("--host", default="0.0.0.0")
+    serve.add_argument("--port", type=int, default=8080)
+
+    args = parser.parse_args()
+    if args.command == "render-fritz-url":
+        print(_render_fritz_url(args.base_url, args.host, args.include_ipv6))
+    elif args.command == "serve":
+        import uvicorn
+
+        settings = DdnsSettings.from_env()
+        if not settings.admin_password:
+            raise SystemExit("DDNS_ADMIN_PASSWORD must be set.")
+        uvicorn.run(make_app(settings), host=args.host, port=args.port)
+
+
+def _render_fritz_url(base_url: str, host: str, include_ipv6: bool) -> str:
+    base = base_url.rstrip("/")
+    url = f"{base}/nic/update?hostname=<domain>&myip=<ipaddr>&username=<username>&password=<pass>"
+    if include_ipv6:
+        url += "&myipv6=<ip6addr>"
+    return url.replace("<domain>", host)
+
+
+if __name__ == "__main__":
+    main()
+