$OpenBSD: patch-no_ip,v 1.3 2001/06/01 23:36:32 jakob Exp $

Do not bail if the interface does not have an IP assigned.

--- arpwatch.c.orig	Sat Oct 14 04:07:35 2000
+++ arpwatch.c	Sat Jun  2 01:22:14 2001
@@ -223,9 +223,11 @@ main(int argc, char **argv)
 
 		/* Determine network and netmask */
 		if (pcap_lookupnet(interface, &net, &netmask, errbuf) < 0) {
-			(void)fprintf(stderr, "%s: bad interface %s: %s\n",
-			    prog, interface, errbuf);
-			exit(1);
+			(void)fprintf(stderr,
+			    "%s: WARNING: cannot determine net/mask: %s\n",
+			    prog, errbuf);
+			net = 0;
+			netmask = 0;
 		}
 
 		/* Drop into the background if not debugging */