#! /bin/sh

guesswan()
{
  line=$(ip route show | grep ^default)
  # eg: "default via 192.168.5.1 dev wan0 "
  line=${line##* dev }
  line=${line%% *}
  echo $line
}

makeconf()
{
  local wan
  wan="$1"
  (
    echo "quickleave"
    echo "phyint $wan upstream ratelimit 0 threshold 1"
    echo "  altnet 0.0.0.0/0"
    echo "phyint br0 downstream ratelimit 0 threshold 1"
  ) > /etc/igmpproxy.conf
}

wan=$(guesswan)
if [ -z "$wan" ]; then
  echo "No wan detected, igmpproxy will not start" 1>&2
  exit 1
fi

makeconf "$wan"

# igmpproxy will fail if there are no ipv4 addresses on wan0 or br0
# babysitter (in S48igmpproxy) should restart it until there are
exec igmpproxy -d /etc/igmpproxy.conf