DnsServer *manager_get_first_dns_server(Manager *m, DnsServerType t) {
        assert(m);

        switch (t) {

        case DNS_SERVER_SYSTEM:
                return m->dns_servers;

        case DNS_SERVER_FALLBACK:
                return m->fallback_dns_servers;

        default:
                return NULL;
        }
}
DnsServer *manager_get_first_dns_server(Manager *m, DnsServerType t) {
        assert(m);

        switch (t) {

        case DNS_SERVER_SYSTEM:
                return m->dns_servers;

        case DNS_SERVER_FALLBACK:
                return m->fallback_dns_servers;

        default:
                return NULL;
        }
}