API: Reject unknown flags

[adns] / src / setup.c

diff --git a/src/setup.c b/src/setup.c
index de031e3..fd20c43 100644 (file)
--- a/src/setup.c
+++ b/src/setup.c
@@ -5,14 +5,15 @@
  */
 /*
  *  This file is part of adns, which is
- *    Copyright (C) 1997-2000,2003,2006  Ian Jackson
+ *    Copyright (C) 1997-2000,2003,2006,2014  Ian Jackson
+ *    Copyright (C) 2014  Mark Wooding
  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
  *    Copyright (C) 1991 Massachusetts Institute of Technology
  *  (See the file INSTALL for full details.)
  *  
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2, or (at your option)
+ *  the Free Software Foundation; either version 3, or (at your option)
  *  any later version.
  *  
  *  This program is distributed in the hope that it will be useful,
@@ -21,8 +22,7 @@
  *  GNU General Public License for more details.
  *  
  *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software Foundation,
- *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
+ *  along with this program; if not, write to the Free Software Foundation.
  */
 
 #include <stdlib.h>
@@ -567,6 +567,10 @@ static int init_begin(adns_state *ads_r, adns_initflags flags,
   adns_state ads;
   pid_t pid;
   
+  if (flags & ~(adns_initflags)(0x4fff))
+    /* 0x4000 is reserved for `harmless' future expansion */
+    return ENOSYS;
+
   ads= malloc(sizeof(*ads)); if (!ads) return errno;
 
   ads->iflags= flags;