From: op <op@openbsd.org>
Date: Thu, 16 Nov 2023 10:23:21 +0000 (+0000)
Subject: consider an MX of "localhost" as it were a "Null MX"
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=28e3f7cbb365cbcbefcfaeefd03bac1eb4a157f8;p=openbsd

consider an MX of "localhost" as it were a "Null MX"

diff from Philipp (philipp+openbsd [at] bureaucracy [dot] de), thanks!

ok sthen@
---

diff --git a/usr.sbin/smtpd/dns.c b/usr.sbin/smtpd/dns.c
index dc7987aa29c..b1b49ea7576 100644
--- a/usr.sbin/smtpd/dns.c
+++ b/usr.sbin/smtpd/dns.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dns.c,v 1.91 2023/11/08 08:46:34 op Exp $	*/
+/*	$OpenBSD: dns.c,v 1.92 2023/11/16 10:23:21 op Exp $	*/
 
 /*
  * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org>
@@ -263,7 +263,8 @@ dns_dispatch_mx(struct asr_result *ar, void *arg)
 		print_dname(rr.rr.mx.exchange, buf, sizeof(buf));
 		buf[strlen(buf) - 1] = '\0';
 
-		if (rr.rr.mx.preference == 0 && !strcmp(buf, "")) {
+		if ((rr.rr.mx.preference == 0 && !strcmp(buf, "")) ||
+		    !strcmp(buf, "localhost")) {
 			nullmx = 1;
 			continue;
 		}