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 ] && {

net/ocserv/patches/002-Notify-the-client-that-the-server-may-have-a-dynamic.patch

@@ -0,0 +1,101 @@
+From cb9dcde3874441bf66d52b70ac8b0d6f6bb557d9 Mon Sep 17 00:00:00 2001
+From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
+Date: Sun, 30 Nov 2014 11:30:08 +0100
+Subject: [PATCH] Notify the client that the server may have a dynamic DNS
+ address
+
+That is send "X-CSTP-DynDNS: true", in CSTP headers if the
+server is configured as having a dynamic DNS address.
+---
+ doc/sample.config   | 5 +++++
+ src/config.c        | 2 ++
+ src/ocserv-args.def | 5 +++++
+ src/vpn.h           | 1 +
+ src/worker-vpn.c    | 7 +++++++
+ 5 files changed, 20 insertions(+)
+
+diff --git a/doc/sample.config b/doc/sample.config
+index a39e573..e07e36a 100644
+--- a/doc/sample.config
++++ b/doc/sample.config
+@@ -51,6 +51,11 @@ max-same-clients = 2
+ # hostname.
+ #listen-host = [IP|HOSTNAME]
+ 
++# 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 = true
++
+ # TCP and UDP port number
+ tcp-port = 443
+ udp-port = 443
+diff --git a/src/config.c b/src/config.c
+index 2721a45..0b7e029 100644
+--- a/src/config.c
++++ b/src/config.c
+@@ -60,6 +60,7 @@ static struct cfg_options available_options[] = {
+ 	{ .name = "custom-header", .type = OPTION_MULTI_LINE, .mandatory = 0 },
+ 	{ .name = "split-dns", .type = OPTION_MULTI_LINE, .mandatory = 0 },
+ 	{ .name = "listen-host", .type = OPTION_STRING, .mandatory = 0 },
++	{ .name = "listen-host-is-dyndns", .type = OPTION_BOOLEAN, .mandatory = 0 },
+ 	{ .name = "tcp-port", .type = OPTION_NUMERIC, .mandatory = 0 },
+ 	{ .name = "udp-port", .type = OPTION_NUMERIC, .mandatory = 0 },
+ 	{ .name = "keepalive", .type = OPTION_NUMERIC, .mandatory = 0 },
+@@ -403,6 +404,7 @@ unsigned force_cert_auth;
+ 	 * reload_cfg_file();
+ 	 */
+ 	READ_STRING("listen-host", config->name);
++	READ_TF("listen-host-is-dyndns", config->is_dyndns, 0);
+ 
+ 	READ_NUMERIC("tcp-port", config->port);
+ 	READ_NUMERIC("udp-port", config->udp_port);
+diff --git a/src/ocserv-args.def b/src/ocserv-args.def
+index cdc60bd..146e59a 100644
+--- a/src/ocserv-args.def
++++ b/src/ocserv-args.def
+@@ -126,6 +126,11 @@ max-same-clients = 2
+ # hostname.
+ #listen-host = [IP|HOSTNAME]
+ 
++# 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 = true
++
+ # TCP and UDP port number
+ tcp-port = 3333
+ udp-port = 3333
+diff --git a/src/vpn.h b/src/vpn.h
+index a460370..03721e1 100644
+--- a/src/vpn.h
++++ b/src/vpn.h
+@@ -188,6 +188,7 @@ struct cfg_st {
+ 	char *name; /* server name */
+ 	unsigned int port;
+ 	unsigned int udp_port;
++	unsigned int is_dyndns;
+ 	char* unix_conn_file;
+ 
+ 	char *pin_file;
+diff --git a/src/worker-vpn.c b/src/worker-vpn.c
+index 364cbff..4cb5d99 100644
+--- a/src/worker-vpn.c
++++ b/src/worker-vpn.c
+@@ -1650,6 +1650,13 @@ static int connect_handler(worker_st * ws)
+ 		     "X-CSTP-Smartcard-Removal-Disconnect: true\r\n");
+ 	SEND_ERR(ret);
+ 
++	if (ws->config->is_dyndns != 0) {
++		ret =
++		    cstp_puts(ws,
++			     "X-CSTP-DynDNS: true\r\n");
++		SEND_ERR(ret);
++	}
++
+ 	if (ws->config->rekey_time > 0) {
+ 		unsigned method;
+ 
+-- 
+2.1.3
+