Added configurable DNS for VPN connection

Makefile

@@ -67,6 +67,11 @@ case "$${PLUTO_VERB}" in
         for net in "$${SUBNETS[@]}"; do
             ip route add "$net" dev "$${VTI_IF}" 2> /dev/null
         done
+        DNS=`/sbin/uci -q get vpn.hub.dns`
+        if [[ -n "$$DNS" ]]; then
+            DNS_SERVERS=$$(echo "$$DNS" | tr ',' ' ' | xargs)
+            resolvectl dns $${VTI_IF} $$DNS_SERVERS
+        fi
         sysctl -w "net.ipv4.conf.$${VTI_IF}.disable_policy=1"
         networks=`printf %s "$$(ip route list proto kernel scope link | awk -F " " "{ print \\$$1 }")" | tr '\\n' ','`
         if [ ! -z "$$networks" ] ; then
@@ -94,6 +99,7 @@ define VPN_CONFIG
 config vpn 'hub'
 	option address ''
 	option subnet ''
+	option dns ''
 
 config ca 'issuer'
 	option uri ''

vpn

@@ -18,6 +18,7 @@ entry_execute_method_root_VPN() {
 		common_execute_method_param "$DMROOT.VPN.CertificateStatus" "0" "vpn_get_certificate_status"
 		common_execute_method_param "$DMROOT.VPN.Hub" "1" "vpn_get_hub" "vpn_set_hub"
 		common_execute_method_param "$DMROOT.VPN.Subnet" "1" "vpn_get_subnet" "vpn_set_subnet"
+		common_execute_method_param "$DMROOT.VPN.DNS" "1" "vpn_get_DNS" "vpn_set_DNS"
 		common_execute_method_param "$DMROOT.VPN.Issuer" "1" "vpn_get_issuer_URI" "vpn_set_issuer_URI"
 		common_execute_method_param "$DMROOT.VPN.DN" "1" "vpn_get_DN" "vpn_set_DN"
 		return 0;
@@ -157,6 +158,19 @@ vpn_set_subnet() {
 	fi
 }
 
+vpn_get_DNS() {
+	echo `$UCI_GET vpn.hub.dns`
+}
+
+vpn_set_DNS() {
+	local dns=`$UCI_GET vpn.hub.dns`
+	if [ "$dns" != "$1" ]; then
+		$UCI_SET vpn.hub.dns="$1"
+		$UCI_COMMIT
+		configure_ipsec
+	fi
+}
+
 vpn_get_issuer_URI() {
 	echo `$UCI_GET vpn.issuer.uri`
 }