commit b92712dc9cb7b9302171186c7f408d305622749c
Author: Richard Kettlewell <rjk@greenend.org.uk>
Date:   Sat Jul 2 22:27:37 2011 +0100

    Reject bad command lines options.

diff --git a/secnet.c b/secnet.c
index 1a4e8fd..f9808b7 100644
--- a/secnet.c
+++ b/secnet.c
@@ -141,6 +141,7 @@ static void parse_options(int argc, char **argv)
 	    break;
 
 	case '?':
+	    exit(1);
 	    break;
 
 	default: