Fixed getting previous node for NSEC.

libknot/nameserver/name-server.c

@@ -969,9 +969,18 @@ static int ns_put_nsec_nxdomain(const knot_dname_t *qname,
 	if (previous == NULL) {
 		/*! \todo Check version. */
 		previous = knot_zone_contents_find_previous(zone, qname);
+		
+		while (!knot_node_is_auth(previous)) {
+			previous = knot_node_previous(previous, 1);
+		}
+		
 		previous = knot_node_current(previous);
 		assert(previous != NULL);
 	}
+	
+	char *name = knot_dname_to_str(previous->owner);
+	debug_knot_ns("Previous node: %s\n", name);
+	free(name);
 
 	// 1) NSEC proving that there is no node with the searched name
 	rrset = knot_node_rrset(previous, KNOT_RRTYPE_NSEC);
@@ -1174,9 +1183,13 @@ static void ns_put_nsec_wildcard(const knot_zone_contents_t *zone,
 	       && knot_query_dnssec_requested(knot_packet_query(resp)));
 
 	// check if we have previous; if not, find one using the tree
-	if (previous == NULL) {
-		
+	if (previous == NULL) {		
 		previous = knot_zone_contents_find_previous(zone, qname);
+		
+		while (!knot_node_is_auth(previous)) {
+			previous = knot_node_previous(previous, 1);
+		}
+		
 		previous = knot_node_current(previous);
 		assert(previous != NULL);
 	}