#!/bin/sh

. /etc/utils.sh

FAILURE_DELAY="30"
SUCCESS_DELAY="900"

while :; do
  ip46tables -F captive-portal-ntp

  code="0"
  for dst in $@; do
    echo "Updating ntp server: $dst"
    ip46tables -A captive-portal-ntp -p udp -d "$dst" --dport ntp -j ACCEPT
    code=$(( $code | $? ))
  done

  if [ "$code" -eq "0" ]; then
    echo "Success. Next update in $SUCCESS_DELAY s."
    sleep "$SUCCESS_DELAY"
  else
    echo "Failure! Trying again in $FAILURE_DELAY s."
    sleep "$FAILURE_DELAY"
  fi
done