whmcsDNSManager/modules/addons/DNSManager2/controllers/addon/clientarea/setsdns.php

<?php

namespace MGModule\DNSManager2\controllers\addon\clientarea;

use MGModule\DNSManager2\mgLibs\custom\manager\GlobalSettingHelper;
use MGModule\DNSManager2\models\custom\globalsetting\GlobalSettingEnum;
use \MGModule\DNSManager2 as main;

class setsdns extends main\mgLibs\process\abstractController
{
    function indexHTML($input, $vars = array())
    {
        if(GlobalSettingHelper::getSetting(GlobalSettingEnum::RDNS_IN_CLIENTAREA) == GlobalSettingEnum::CLIENTAREA_RNDS_ONLY)
        {
            header('Location: index.php?m=DNSManager2&mg-action=manageRDNS');
            die;
        }
        return array(
            'tpl'   => 'setsdns'
            ,'vars' => $vars
        );
    }
}