ntp: T4456: support listening on specified interface

When clients only use DHCP for interface addressing we can not bind NTPd to
an address - as it will fail if the address changes. This commit adds support
to bind ntpd to a given interface in addition to a given address.

set system ntp interface <name>

1 files changed, 10 insertions, 3 deletions

diff --git a/data/templates/ntp/ntpd.conf.j2 b/data/templates/ntp/ntpd.conf.j2
index da610051e..8921826fa 100644
--- a/data/templates/ntp/ntpd.conf.j2
+++ b/data/templates/ntp/ntpd.conf.j2
@@ -33,10 +33,17 @@ restrict {{ address | address_from_cidr }} mask {{ address | netmask_from_cidr }
 {%     endfor %}
 {% endif %}
 
-{% if listen_address %}
+{% if listen_address is vyos_defined or interface is vyos_defined %}
 # NTP should listen on configured addresses only
 interface ignore wildcard
-{%     for address in listen_address %}
+{%     if listen_address is vyos_defined %}
+{%         for address in listen_address %}
 interface listen {{ address }}
-{%     endfor %}
+{%         endfor %}
+{%     endif %}
+{%     if interface is vyos_defined %}
+{%         for ifname in interface %}
+interface listen {{ ifname }}
+{%         endfor %}
+{%     endif %}
 {% endif %}