### -*-m4-*-
###
### Failsafe prologue for firewall scripts
###
### (c) 2008 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This program is free software; you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2 of the License, or
### (at your option) any later version.
###
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
### GNU General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with this program; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

m4_divert(10)m4_dnl
###--------------------------------------------------------------------------
### Failsafe prologue.

revert () {
  echo "$1!  Retreating to safe version..."
  if ! "$firewall_failsafe" revert; then
    echo >&2 "Safe firewall failed.  You're screwed.  Good luck."
    exit 1
  fi
  echo >&2 "Phew!  Fallback to safe version successful."
  exit 1
}

finished () {
  echo "Done."
  exit 0
}

exit_after_clearing=:
export FWCOOKIE=magical
case "${1-update}" in
  start | restart | reload | force-reload)
    echo -n "Starting up firewall... "
    "$firewall_script" install || revert "Failed"
    finished
    ;;
  stop)
    echo -n "Shutting down firewall... "
    exit_after_clearing=finished
    ;;
  update)
    echo -n "Installing new firewall... "
    "$firewall_script" install || revert "Failed"
    echo "Done."
    echo "Can you hear me?"
    parent=$$
    (sleep 5; kill $parent; revert "Timeout")&
    child=$!
    read answer
    kill $child
    case "$answer" in
      y* | Y*)
	echo "Cool.  We're done here."
	exit 0
	;;
    esac
    revert "Bogus"
    ;;
  install | revert)
    ;;
  *)
    echo >&2 "Usage: firewall start|stop|reload|restart|force-reload|update|install|revert"
    exit 1
    ;;
esac

m4_divert(-1)
###----- That's all, folks --------------------------------------------------