check dns use of domain before delete domain from client

interface/web/client/domain_del.php

@@ -62,6 +62,18 @@ class page_action extends tform_actions {
 		 */
 		$domain = $this->dataRecord['domain'];
 
+		$sql = "SELECT id FROM dns_soa WHERE origin = '" . $app->db->quote($domain.".") . "'";
+		$res = $app->db->queryOneRecord($sql);
+		if (is_array($res)){
+			$app->error($wb['error_domain_in dnsuse']);
+		}
+
+		$sql = "SELECT id FROM dns_slave WHERE origin = '" . $app->db->quote($domain.".") . "'";
+		$res = $app->db->queryOneRecord($sql);
+		if (is_array($res)){
+			$app->error($wb['error_domain_in dnsslaveuse']);
+		}
+
 		$sql = "SELECT domain_id FROM mail_domain WHERE domain = '" . $app->db->quote($domain) . "'";
 		$res = $app->db->queryOneRecord($sql);
 		if (is_array($res)){

interface/web/client/lib/lang/en.lng

@@ -19,6 +19,8 @@ $wb['Edit Client Circle'] = 'Edit Client Circle';
 $wb['Domains'] = 'Domains';
 $wb['domain_txt'] = 'Domain';
 $wb['client_txt'] = 'Client';
+$wb['error_domain_in dnsuse'] = 'This domain cannot be deleted, because it is in use as dns zone';
+$wb['error_domain_in dnsslaveuse'] = 'This domain cannot be deleted, because it is in use as secondary dns zone';
 $wb['error_domain_in mailuse'] = 'This domain cannot be deleted, because it is in use as mail-domain';
 $wb['error_domain_in webuse'] = 'This domain cannot be deleted, because it is in use as web-domain';
 $wb['error_client_can_not_add_domain'] = 'You cannot add a new domain';

interface/web/client/lib/lang/es.lng

@@ -20,6 +20,8 @@ $wb['Edit Client Circle'] = 'Editar círculo de clientes';
 $wb['Domains'] = 'Dominios';
 $wb['domain_txt'] = 'Dominio';
 $wb['client_txt'] = 'Cliente';
+$wb['error_domain_in dnsuse'] = 'No se puede eliminar este dominio, porque está en uso como zona dns';
+$wb['error_domain_in dnsslaveuse'] = 'No se puede eliminar este dominio, porque está en uso como zona dns secundaria';
 $wb['error_domain_in mailuse'] = 'No se puede eliminar este dominio, porque está en uso como dominio de correo';
 $wb['error_domain_in webuse'] = 'No se puede eliminar este dominio, porque está en uso como sitio web';
 $wb['error_client_can_not_add_domain'] = 'No puedes añadir más dominios';