From c61ee61e98c0b24cc26ae72b8d6d95f2fb8fdd9c Mon Sep 17 00:00:00 2001
From: jsg <jsg@openbsd.org>
Date: Wed, 20 Jul 2016 11:43:31 +0000
Subject: [PATCH] Add a -n flag to check the configuration and exit.  Matches
 what almost all the other daemons do.

ok reyk@
---
 usr.sbin/switchd/switchd.c | 18 +++++++++++++++---
 usr.sbin/switchd/switchd.h |  6 +++++-
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/usr.sbin/switchd/switchd.c b/usr.sbin/switchd/switchd.c
index 19e6bf4c079..57e4b1abf1d 100644
--- a/usr.sbin/switchd/switchd.c
+++ b/usr.sbin/switchd/switchd.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: switchd.c,v 1.3 2016/07/19 17:34:13 reyk Exp $	*/
+/*	$OpenBSD: switchd.c,v 1.4 2016/07/20 11:43:31 jsg Exp $	*/
 
 /*
  * Copyright (c) 2013-2016 Reyk Floeter <reyk@openbsd.org>
@@ -61,7 +61,7 @@ __dead void
 usage(void)
 {
 	extern const char	*__progname;
-	fprintf(stderr, "usage: %s [-dv] [-D macro=value] [-f file] "
+	fprintf(stderr, "usage: %s [-dnv] [-D macro=value] [-f file] "
 	    "[-c mac-cache-size] [-t cache-timeout]\n",
 	    __progname);
 	exit(1);
@@ -76,13 +76,14 @@ main(int argc, char *argv[])
 	const char		*errstr = NULL;
 	int			 c;
 	int			 debug = 0, verbose = 0;
+	uint32_t		 opts = 0;
 	unsigned int		 cache = SWITCHD_CACHE_MAX;
 	unsigned int		 timeout = SWITCHD_CACHE_TIMEOUT;
 	const char		*conffile = SWITCHD_CONFIG;
 
 	log_init(1, LOG_DAEMON);
 
-	while ((c = getopt(argc, argv, "c:dD:f:ht:v")) != -1) {
+	while ((c = getopt(argc, argv, "c:dD:f:hnt:v")) != -1) {
 		switch (c) {
 		case 'c':
 			cache = strtonum(optarg, 1, UINT32_MAX, &errstr);
@@ -102,6 +103,9 @@ main(int argc, char *argv[])
 		case 'f':
 			conffile = optarg;
 			break;
+		case 'n':
+			opts |= SWITCHD_OPT_NOACTION;
+			break;
 		case 't':
 			timeout = strtonum(optarg, 0, UINT32_MAX, &errstr);
 			if (errstr != NULL) {
@@ -111,6 +115,7 @@ main(int argc, char *argv[])
 			break;
 		case 'v':
 			verbose++;
+			opts |= SWITCHD_OPT_VERBOSE;
 			break;
 		default:
 			usage();
@@ -125,6 +130,7 @@ main(int argc, char *argv[])
 
 	sc->sc_cache_max = cache;
 	sc->sc_cache_timeout = timeout;
+	sc->sc_opts = opts;
 
 	srv = &sc->sc_server;
 	srv->srv_sc = sc;
@@ -139,6 +145,12 @@ main(int argc, char *argv[])
 		exit(1);
 	}
 
+	if (opts & SWITCHD_OPT_NOACTION) {
+		fprintf(stderr, "configuration OK\n");
+		proc_kill(&sc->sc_ps);
+		exit(0);
+	}
+
 	/* check for root privileges */
 	if (geteuid())
 		fatalx("need root privileges");
diff --git a/usr.sbin/switchd/switchd.h b/usr.sbin/switchd/switchd.h
index 28b3abdcf8f..93e8da604fa 100644
--- a/usr.sbin/switchd/switchd.h
+++ b/usr.sbin/switchd/switchd.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: switchd.h,v 1.1 2016/07/19 16:54:26 reyk Exp $	*/
+/*	$OpenBSD: switchd.h,v 1.2 2016/07/20 11:43:31 jsg Exp $	*/
 
 /*
  * Copyright (c) 2013-2016 Reyk Floeter <reyk@openbsd.org>
@@ -109,6 +109,7 @@ struct switchd {
 	unsigned int		 sc_cache_max;
 	unsigned int		 sc_cache_timeout;
 	char			 sc_conffile[PATH_MAX];
+	uint8_t			 sc_opts;
 	TAILQ_HEAD(, switch_device)
 				 sc_conns;
 };
@@ -122,6 +123,9 @@ struct ofp_callback {
 			    struct ibuf *);
 };
 
+#define SWITCHD_OPT_VERBOSE		0x01
+#define SWITCHD_OPT_NOACTION		0x04
+
 /* switchd.c */
 int		 switchd_socket(struct sockaddr *, int);
 int		 switchd_listen(struct sockaddr *);
-- 
2.20.1