#!/bin/sh
#
# clatd dispatcher script for NetworkManager
#
# Install it to:  /etc/NetworkManager/dispatcher.d/50-clatd
# 
# Written by Tore Anderson <tore@fud.no>
#

# Newer NetworkManager versions will run the dispatcher scripts once
# a new unmanaged interface shows up, including the 'clat' interface
# created by clatd/TAYGA. So if we're being called due to our own
# interface showing up, do nothing, otherwise we will end up
# committing suicide from the restarts below
[ "$DEVICE_IFACE" = "clat" ] && exit 0

# We're only acting on interface "up" or "down" events. NM will run the
# dispatcher scripts for other events we're not interested in, like the
# hostname being set or a DHCP lease being renewed. Ignore those.
[ "$2" != "up" ] && [ "$2" != "down" ] && exit 0

# We simply restart clatd in all situations, as no matter if an interface
# goes up or down, it may mean that the PLAT device changes, it may mean
# native IPv4 appearing or disappearing, or it may mean that DNS64 became
# available or unavailable...it's far easier to simply restart always and
# start from scratch than to figure out if a restart is truly necessary

# systemd-based distros
if which systemctl &> /dev/null; then
  systemctl --no-block restart clatd.service
fi

# upstart-based distros
if test -x /sbin/initctl; then
  /sbin/initctl restart clatd
fi