badvpn/ncd/examples/router/list-port-forwardings

#!/usr/bin/badvpn-ncd

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

    num_different(args.length, "0") bad_args;
    If (bad_args) {
        println("Usage: list-port-forwardings");
        exit("1");
    };

    var("0") exit_status;

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

    var({"list-port-forwardings"}) 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") arg;

    val_equal(status, "ok") is_ok;
    If (is_ok) {
        println("Protocol  Start  End    Destination");
        Foreach (arg As entry) {
            value(entry) entry;
            entry->get("0") protocol;
            entry->get("1") port_start;
            entry->get("2") port_end;
            entry->get("3") dest_addr;
            call("append_spaces", {port_start, "5"}) fixed_start;
            call("append_spaces", {port_end, "5"}) fixed_end;
            println(protocol, "       ", fixed_start.result, "  ", fixed_end.result, "  ", dest_addr);
        };
    } Else {
        _caller.exit_status->set("1");
        println("Error: ", arg);
    };
}

template finished_handler {
    exit(_caller.exit_status);
}

template append_spaces {
    alias("_arg0") input;
    alias("_arg1") min_length;

    value(input) result;
    backtrack_point() point;
    num_lesser(result.length, min_length) more;
    If (more) {
        result->append(" ");
        point->go();
    };
}