$OpenBSD: patch-ip_util_c,v 1.1 2002/03/24 08:36:33 jsyn Exp $
--- ip_util.c.orig	Thu Oct 28 19:15:38 1999
+++ ip_util.c	Thu Oct 28 19:16:21 1999
@@ -35,8 +35,9 @@
 
   devname = getenv(ANTI_INTERFACE);
   if (!devname){
-    getnetmask(DEVICENAME, (struct in_addr *)&network);
-    getipaddr(DEVICENAME, (struct in_addr *)&localIP);
+    devname = strdup(pcap_lookupdev(NULL));
+    getnetmask(devname, (struct in_addr *)&network);
+    getipaddr(devname, (struct in_addr *)&localIP);
   } else {
     devPtr = strrchr(devname, '/');
     if (devPtr)