From 1d35a8527e5422967514dd1d47350ff2ede55903 Mon Sep 17 00:00:00 2001
From: Andrew Hewus Fresh <andrew@afresh1.com>
Date: Sat, 30 Oct 2021 12:10:06 -0700
Subject: [PATCH] Support for OpenBSD's resolvd via route messages

This adds support for managing resolv.conf via resolvd(8),
by sending nameserver messages with route(8) to add and
remove nameservers.

https://man.openbsd.org/resolvd.8
https://man.openbsd.org/route.8#nameserver
---
 vpnc-script | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/vpnc-script b/vpnc-script
index 237062e..0955008 100755
--- a/vpnc-script
+++ b/vpnc-script
@@ -192,6 +192,10 @@ elif [ -x /sbin/modify_resolvconf ]; then
 elif [ -x /usr/sbin/unbound-control ] && /usr/sbin/unbound-control status > /dev/null 2>&1; then
 	MODIFYRESOLVCONF=modify_resolvconf_unbound
 	RESTORERESOLVCONF=restore_resolvconf_unbound
+elif [ -x /usr/sbin/rcctl ] && /usr/sbin/rcctl check resolvd >/dev/null; then
+	# OpenBSD's resolvd by sending route messages
+	MODIFYRESOLVCONF=modify_resolvconf_resolvd
+	RESTORERESOLVCONF=restore_resolvconf_resolvd
 else # Generic for any OS
 	MODIFYRESOLVCONF=modify_resolvconf_generic
 	RESTORERESOLVCONF=restore_resolvconf_generic
@@ -899,6 +903,16 @@ restore_resolvconf_unbound() {
 	fi
 }
 
+# === resolv.conf handling via resolvd =========
+
+modify_resolvconf_resolvd() {
+	/sbin/route nameserver $TUNDEV $INTERNAL_IP4_DNS $INTERNAL_IP6_DNS
+}
+
+restore_resolvconf_resolvd() {
+	/sbin/route nameserver $TUNDEV
+}
+
 # ========= Toplevel state handling  =======================================
 
 do_pre_init() {
-- 
2.50.1