#!/usr/bin/bash

if [ $(/usr/bin/id -u) != 0 ]; then echo "only root can do that"; exit 2; fi

#***************************************************************************
# This file is part of the CRYPTO BONE
# File     : cron.fetchmail 
# Version  : 1.5 (external cryptobone)
# License  : BSD
# Date     : Wednesday, 1 March 2023
# Contact  : Please send enquiries and bug-reports to innovation@senderek.ie
#
#
# Copyright (c) 2015-2023
#	Ralf Senderek, Ireland.  All rights reserved. (https://senderek.ie)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	   This product includes software developed by Ralf Senderek.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND  ANY EXPRESS OR 
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE  IMPLIED WARRANTIES 
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
# POSSIBILITY OF SUCH DAMAGE.
#****************************************************************************

CONFIG=/usr/lib/cryptobone/ext/.exfetchmailrc

RAM=/dev/shm/EXRAM

if [ -s $RAM/GUI ]
then
     # check if GUI is still active
     NOW=$(date +%s)
     LAST=$(cat $RAM/GUI 2> /dev/null)
     delta=$(( $NOW - $LAST ))
     echo $delta > $RAM/delta
     if [ $delta -gt 600 ]
     then    
          date +%s > $RAM/exit
          # grace time is over 
          /bin/rm -f $RAM/GUI $RAM/delta
     fi
fi     


if [ -L /usr/lib/cryptobone/ext/masterkey ] && [ -d /dev/shm/EXRAM ] && [ -s $RAM/GUI ] ; then

     # only run fetchmail if GUI is active
     # make sure the .fetchmail file exists
     if [ ! -r $CONFIG ]
     then
          /usr/lib/cryptobone/ext/bin/createfetchmailrc 2> /dev/null
     fi

     FETCH=/tmp/exfetch
     touch $FETCH
     ERROR=/dev/shm/EXRAM/exfetchmail.error
     OUT=/dev/shm/EXRAM/exfetchmail.output
     
     /usr/bin/fetchmail -f $CONFIG  -p AUTO -t 45 --nosslcertck --all --bsmtp $FETCH 2> $ERROR > $OUT
     
     /bin/chmod 600 $OUT $ERROR 
     if [[ -r $FETCH ]]; then
          /bin/chmod 600 $FETCH
     fi

     /bin/mkdir /dev/shm/EXRAM/IN 2> /dev/null
     /bin/mkdir /dev/shm/EXRAM/FORENSIC 2> /dev/null
     /bin/mkdir /dev/shm/EXRAM/MESSAGES 2> /dev/null
     /bin/chmod 700 /dev/shm/EXRAM/MESSAGES /dev/shm/EXRAM/IN /dev/shm/EXRAM/FORENSIC 2> /dev/null

     if [ -r $FETCH ] ; then
          /bin/mv $FETCH /dev/shm/EXRAM
          # split the file into messages and analyse them all
          /usr/lib/cryptobone/ext/bin/analysebatchfile 2> /dev/null

          MAILFILE="/dev/shm/EXRAM/exfetch-`date +%y.%m.%d-%H.%M`"
          /bin/mv /dev/shm/EXRAM/exfetch $MAILFILE
          /bin/chmod 400 $MAILFILE
          # remove if size is 0
          if [ ! -s $MAILFILE ]
          then
               /bin/rm -f $MAILFILE
          fi

     fi
fi