add dns_db_class()

lib/dns/db.c

@@ -158,6 +158,17 @@ dns_db_origin(dns_db_t *db) {
 	return (&db->origin);
 }
 
+dns_rdataclass_t
+dns_db_class(dns_db_t *db) {
+	/*
+	 * The class of the database.
+	 */
+
+	REQUIRE(DNS_DB_VALID(db));
+
+	return (db->rdclass);
+}
+
 dns_result_t
 dns_db_load(dns_db_t *db, char *filename) {
 	/*

lib/dns/include/dns/db.h

@@ -283,6 +283,20 @@ dns_db_origin(dns_db_t *db);
  *	The origin of the database.
  */
 
+dns_rdataclass_t
+dns_db_class(dns_db_t *db);
+/*
+ * The class of the database.
+ *
+ * Requires:
+ *
+ *	'db' is a valid database.
+ *
+ * Returns:
+ *
+ *	The class of the database.
+ */
+
 dns_result_t
 dns_db_load(dns_db_t *db, char *filename);
 /*