mdw@git.distorted.org.uk Git - firewall/blob - prologue.m4

   1 ### -*-sh-*-
   2 ###
   3 ### Failsafe prologue for firewall scripts
   4 ###
   5 ### (c) 2008 Mark Wooding
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This program is free software; you can redistribute it and/or modify
  11 ### it under the terms of the GNU General Public License as published by
  12 ### the Free Software Foundation; either version 2 of the License, or
  13 ### (at your option) any later version.
  14 ###
  15 ### This program is distributed in the hope that it will be useful,
  16 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ### GNU General Public License for more details.
  19 ###
  20 ### You should have received a copy of the GNU General Public License
  21 ### along with this program; if not, write to the Free Software Foundation,
  22 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23
  24 m4_divert(10)m4_dnl
  25 ###--------------------------------------------------------------------------
  26 ### Failsafe prologue.
  27
  28 revert () {
  29   echo "$1!  Retreating to safe version..."
  30   if ! "$firewall_failsafe" revert; then
  31     echo >&2 "Safe firewall failed.  You're screwed.  Good luck."
  32     exit 1
  33   fi
  34   echo >&2 "Phew!  Fallback to safe version successful."
  35   exit 1
  36 }
  37
  38 finished () {
  39   echo "Done."
  40   exit 0
  41 }
  42
  43 exit_after_clearing=:
  44 export FWCOOKIE=magical
  45 case "${1-update}" in
  46   start | restart | reload | force-reload)
  47     echo -n "Starting up firewall... "
  48     "$firewall_script" install || revert "Failed"
  49     finished
  50     ;;
  51   stop)
  52     echo -n "Shutting down firewall... "
  53     exit_after_clearing=finished
  54     ;;
  55   update)
  56     echo -n "Installing new firewall... "
  57     "$firewall_script" install || revert "Failed"
  58     echo "Done."
  59     echo "Can you hear me?"
  60     parent=$$
  61     (sleep 5; kill $parent; revert "Timeout")&
  62     child=$!
  63     read answer
  64     kill $child
  65     case "$answer" in
  66       y* | Y*)
  67         echo "Cool.  We're done here."
  68         exit 0
  69         ;;
  70     esac
  71     revert "Bogus"
  72     ;;
  73   install | revert)
  74     ;;
  75   *)
  76     echo >&2 "Usage: firewall start|stop|reload|restart|force-reload|update|install|revert"
  77     exit 1
  78     ;;
  79 esac
  80
  81 m4_divert(-1)
  82 ###----- That's all, folks --------------------------------------------------