teach relay action how to do domain-based relay host, this allows declaring

a single relay action with a mapping of relay hosts per domain.

ok eric@

5 files changed, 43 insertions, 7 deletions

diff --git a/lka.c b/lka.c
index 0b3a9b69..4a4ee7c7 100644
--- a/lka.c
+++ b/lka.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: lka.c,v 1.241 2019/12/12 22:10:47 gilles Exp $	*/
+/*	$OpenBSD: lka.c,v 1.242 2019/12/18 07:57:51 gilles Exp $	*/
 
 /*
  * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
@@ -275,6 +275,7 @@ lka_imsg(struct mproc *p, struct imsg *imsg)
 	case IMSG_MTA_LOOKUP_SMARTHOST:
 		m_msg(&m, imsg);
 		m_get_id(&m, &reqid);
+		m_get_string(&m, &domain);
 		m_get_string(&m, &tablename);
 		m_end(&m);
 
@@ -288,7 +289,11 @@ lka_imsg(struct mproc *p, struct imsg *imsg)
 			m_add_int(p, LKA_TEMPFAIL);
 		}
 		else {
-			ret = table_fetch(table, K_RELAYHOST, &lk);
+			if (domain == NULL)
+				ret = table_fetch(table, K_RELAYHOST, &lk);
+			else
+				ret = table_lookup(table, K_RELAYHOST, domain, &lk);
+
 			if (ret == -1)
 				m_add_int(p, LKA_TEMPFAIL);
 			else if (ret == 0)
diff --git a/mta.c b/mta.c
index 6c817d00..6fbff8e9 100644
--- a/mta.c
+++ b/mta.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mta.c,v 1.232 2019/09/20 17:46:05 gilles Exp $	*/
+/*	$OpenBSD: mta.c,v 1.233 2019/12/18 07:57:51 gilles Exp $	*/
 
 /*
  * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
@@ -926,6 +926,10 @@ mta_query_smarthost(struct envelope *evp0)
 
 	m_create(p_lka, IMSG_MTA_LOOKUP_SMARTHOST, 0, 0, -1);
 	m_add_id(p_lka, evp->id);
+	if (dispatcher->u.remote.smarthost_domain)
+		m_add_string(p_lka, evp->dest.domain);
+	else
+		m_add_string(p_lka, NULL);
 	m_add_string(p_lka, dispatcher->u.remote.smarthost);
 	m_close(p_lka);
 
diff --git a/parse.y b/parse.y
index 6b1b6b1d..5b1546e2 100644
--- a/parse.y
+++ b/parse.y
@@ -1,4 +1,4 @@
-/*	$OpenBSD: parse.y,v 1.269 2019/12/14 16:24:52 gilles Exp $	*/
+/*	$OpenBSD: parse.y,v 1.270 2019/12/18 07:57:52 gilles Exp $	*/
 
 /*
  * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org>
@@ -818,6 +818,27 @@ HELO STRING {
 
 	dispatcher->u.remote.smarthost = strdup(t->t_name);
 }
+| DOMAIN tables {
+	struct table   *t = $2;
+
+	if (dispatcher->u.remote.smarthost) {
+		yyerror("host mapping already specified for this dispatcher");
+		YYERROR;
+	}
+	if (dispatcher->u.remote.backup) {
+		yyerror("backup and domain are mutually exclusive");
+		YYERROR;
+	}
+
+	if (!table_check_use(t, T_DYNAMIC|T_HASH, K_RELAYHOST)) {
+		yyerror("table \"%s\" may not be used for host lookups",
+		    t->t_name);
+		YYERROR;
+	}
+
+	dispatcher->u.remote.smarthost = strdup(t->t_name);
+	dispatcher->u.remote.smarthost_domain = 1;
+}
 | TLS {
 	if (dispatcher->u.remote.tls_required == 1) {
 		yyerror("tls already specified for this dispatcher");
diff --git a/smtpd.conf.5 b/smtpd.conf.5
index cc79cc8e..37652b36 100644
--- a/smtpd.conf.5
+++ b/smtpd.conf.5
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: smtpd.conf.5,v 1.244 2019/12/17 10:30:20 jmc Exp $
+.\"	$OpenBSD: smtpd.conf.5,v 1.245 2019/12/18 07:57:52 gilles Exp $
 .\"
 .\" Copyright (c) 2008 Janne Johansson <jj@openbsd.org>
 .\" Copyright (c) 2009 Jacek Masiulaniec <jacekm@dobremiasto.net>
@@ -17,7 +17,7 @@
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
 .\"
-.Dd $Mdocdate: December 17 2019 $
+.Dd $Mdocdate: December 18 2019 $
 .Dt SMTPD.CONF 5
 .Os
 .Sh NAME
@@ -228,6 +228,10 @@ Use the mapping
 .Ar table
 to look up a hostname matching the source address,
 to advertise during the HELO phase.
+.It Cm domain Pf < Ar domains Ns >
+Do not perform MX lookups but lookup destination domain in
+.Ar domains
+and use matching relay url as relay host.
 .It Cm host Ar relay-url
 Do not perform MX lookups but relay messages to the relay host described by
 .Ar relay-url .
diff --git a/smtpd.h b/smtpd.h
index c41efbac..061b11f1 100644
--- a/smtpd.h
+++ b/smtpd.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: smtpd.h,v 1.645 2019/12/14 16:24:52 gilles Exp $	*/
+/*	$OpenBSD: smtpd.h,v 1.646 2019/12/18 07:57:52 gilles Exp $	*/
 
 /*
  * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org>
@@ -1169,6 +1169,8 @@ struct dispatcher_remote {
 	char	*mail_from;
 
 	char	*smarthost;
+	int	 smarthost_domain;
+
 	char	*auth;
 	int	 tls_required;
 	int	 tls_noverify;