ocserv: enable the X-CSTP-DynDNS header

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

net/ocserv/files/ocserv.conf.template

@@ -18,6 +18,11 @@ auth = "|AUTH|"
 # A banner to be displayed on clients
 banner = "Welcome to OpenWRT"
 
+# When the server has a dynamic DNS address (that may change),
+# should set that to true to ask the client to resolve again on
+# reconnects.
+listen-host-is-dyndns = |DYNDNS|
+
 # Use listen-host to limit to specific IPs or to the IPs of a provided 
 # hostname.
 #listen-host = [IP|HOSTNAME]

net/ocserv/files/ocserv.init

@@ -30,12 +30,17 @@ setup_config() {
 
 	test $auth = "plain" && authsuffix="\[/var/etc/ocpasswd\]"
 
+	dyndns="false"
+	hostname=`uci show ddns|grep domain|head -1|cut -d '=' -f 1`
+	[ -n "$hostname" ] && dyndns="true"
+
 	mkdir -p /var/etc
 	sed -e "s/|PORT|/$port/g" \
 	    -e "s/|MAX_CLIENTS|/$max_clients/g" \
 	    -e "s/|MAX_SAME|/$max_same/g" \
 	    -e "s/|DPD|/$dpd/g" \
 	    -e "s#|AUTH|#$auth$authsuffix#g" \
+	    -e "s#|DYNDNS|#$dyndns#g" \
 	    -e "s/|PREDICTABLE_IPS|/$predictable_ips/g" \
 	    -e "s/|CISCO_COMPAT|/$cisco_compat/g" \
 	    -e "s/|UDP|/$udp/g" \
@@ -86,7 +91,7 @@ setup_dns() {
 start() {
 	local hostname iface
 
-	hostname=`uci get ddns.myddns.domain`
+	hostname=`uci show ddns|grep domain|head -1|cut -d '=' -f 1`
 	[ -z "$hostname" ] && hostname=`uci get system.@system[0].hostname`
 
 	[ ! -f /etc/ocserv/ca-key.pem ] && [ -x /usr/bin/certtool ] && {