pfSense

The behavior of saving and applying on services_dnsmasq.php is inconsistent with itself and with the behavior in Unbound. Ideally it should always prompt to apply and then only run the apply action when apply is clicked. This isn't a regression, it's been like this for years but it's a good time to clean it up.

• Mark the "hosts" subsystem dirty so that "Apply" shows up
• Perform a write_config()

The Apply action should run the following:

            // Reload filter (we might need to sync to CARP hosts)
            filter_configure();
            /* Update resolv.conf in case the interface bindings exclude localhost. */
            system_resolvconf_generate();
            /* Start or restart dhcpleases when it's necessary */
            system_dhcpleases_configure();
            if ($retval == 0) {
                clear_subsystem_dirty('hosts');
            }

Which is currently run during the Save action (and by consequence of how Apply is coded to work on that page, also on Apply)

This will also stop the extra write from happening on "Apply" which is unexpected/unnecessary.