badvpn/ncd/examples/router/add-port-forwarding

#!/usr/bin/badvpn-ncd

process main {
    getargs() args;
    value(args) args;

    num_different(args.length, "4") bad_args;
    If (bad_args) {
        println("Usage: add-port-forwarding <protocol> <port_start> <port_end> <dest_addr>");
        exit("1");
    };

    args->get("0") protocol;
    args->get("1") port_start;
    args->get("2") port_end;
    args->get("3") dest_addr;

    var("0") exit_status;

    sys.request_client({"unix", "/run/ncd-control.socket"}) client;

    var({"add-port-forwarding", protocol, port_start, port_end, dest_addr}) request_data;

    client->request(request_data, "reply_handler", "finished_handler", {});
}

template reply_handler {
    value(_reply.data) reply_data;
    reply_data->get("0") status;
    reply_data->get("1") text;

    val_equal(status, "ok") is_ok;
    If (is_ok) {
        println(text);
    } Else {
        _caller.exit_status->set("1");
        println("Error: ", text);
    };
}

template finished_handler {
    exit(_caller.exit_status);
}