library/roles/openvpn: support pushing dhcp properties to the clients.

infrastructure-services/group_vars/vpn/vpn.yml: Push the internal DNS IP address.

openvpn/defaults/main.yml

@@ -24,6 +24,9 @@ openvpn_server_net: '192.168.254.0 255.255.255.0'
 openvpn_push_routes:
   - '192.168.253.0 255.255.255.0'
 
+#openvpn_push_settings:
+#  - "dhcp-option DNS 10.66.0.4"
+  
 openvpn_tls_server: True
 openvpn_dh: /etc/openvpn/dh2048.pem
 openvpn_tls_auth: '/etc/openvpn/ta.key 0'

openvpn/templates/openvpn.conf.j2

@@ -7,6 +7,16 @@ ifconfig-pool-persist ipp/ipp.txt
 push "route {{ route }}"
 {% endfor %}
 
+{% for route in openvpn_push_routes %}
+push "route {{ route }}"
+{% endfor %}
+
+{% if openvpn_push_settings is defined %}
+{% for dhcp_opt in openvpn_push_settings %}
+push "{{ dhcp_opt }}"
+{% endfor %}
+{% endif %}
+
 port {{ openvpn_port }}
 proto {{ openvpn_protocol }}