add simple alias support to the database backends

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@20236 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/hdb/ext.c

@@ -394,3 +394,17 @@ hdb_entry_get_ConstrainedDelegACL(const hdb_entry *entry,
 
     return 0;
 }
+
+krb5_error_code
+hdb_entry_get_aliases(const hdb_entry *entry, const HDB_Ext_Aliases **a)
+{
+    const HDB_extension *ext;
+
+    ext = hdb_find_extension(entry, choice_HDB_extension_data_aliases);
+    if (ext)
+	*a = &ext->data.u.aliases;
+    else
+	*a = NULL;
+
+    return 0;
+}