Added check to make sure a firewall program is set.

git-svn-id: file:///home/mbr/svn/fwknop/trunk@267 510a4753-2344-4c79-9c09-4d669213fbeb

server/config_init.c

@@ -416,7 +416,14 @@ validate_options(fko_srv_options_t *opts)
         exit(EXIT_FAILURE);
     }
 
-
+    if(opts->config[CONF_EXE_IPTABLES] == NULL
+      && opts->config[CONF_EXE_IPFW] == NULL)
+    {
+        fprintf(stderr,
+            "No firewall command executable is set. Please check fwknopd.conf for EXE_IPTABLES or EXE_IPFW.\n"
+        );
+        exit(EXIT_FAILURE);
+    }
 
     return;
 }