#!/bin/sh
# $Id: named.update,v 1.2 2005/09/14 10:12:52 root Exp root $
# ---------------------------------------------------------------------------
# Purpose:
# Update the nameserver cache information file.
# This is typically run automatically by a cron entry (say, once a month).
# ** the script was modelled after an example found on the Internet **
#
# Eric Hameleers <alien@slackware.com>
# ---------------------------------------------------------------------------

(
  echo "To: hostmaster <hostmaster>"
  echo "From: system <root>"
  echo "Subject: Automatic update of the named.root file"
  echo

  export PATH=/sbin:/usr/sbin:/bin:/usr/bin:
  # When named runs in a chroot jail, we use an alternative directory:
  #cd /chroot/named/var/named
  cd /var/named

  dig @a.root-servers.net . ns >named.root.new

  grep "status: NOERROR" named.root.new >/dev/null 2>&1
  if [ "$?" == "1" ]; then 
    echo "Updating of the named.root file has failed." 
    echo "The following _discarded_ info was retrieved:"
    cat named.root.new
    rm -f named.root.new

  else

    echo "The named.root file has been updated to contain the following information:"
    echo
    cat named.root.new

    chown root.root named.root.new
    chmod 444 named.root.new
    rm -f named.root.old
    mv named.root named.root.old
    mv named.root.new named.root
    /etc/rc.d/rc.bind restart
    echo
    echo "The nameserver has been restarted to ensure that the update is complete."
    echo "The previous named.root file is now called /var/named/named.root.old."

  fi

) 2>&1 | /usr/lib/sendmail -t
exit 0