#!/bin/bash

# psuedocode (with if thens and gotos vs. while dos -- should revise)

#        maxtries = 3 (??) 
#        count = 0
# start: ping ISP (with parameters to limit to say 4 pings instead of continuous)
#        count = count + 1
#          if icmp echo request == 'yes'
#             then
#                fetchmail 
#                sendmail -q
#             else
#                if count <= maxtries (wow, do I forget valid syntax ;-) )
#                   then
#                      wait 30 (??) (give the modem a chance to connect)
#                      goto start
#                   else
#                      issue "Internet connection lost, could not restart" message
#                fi
#          fi


# pseudocode

# let "count = 0"
# success=false
# while let "count <= 3"
# do
#    let "count = $count + 1"
#    ping -c 4 206.245.176.211
# 
#    if [[ `grep -i " 0% packet loss" $HOME/rhkmailping.txt` ]] \
#    then
#       # Ping successful -- connected and no wrong bytes
#       fetchmail 
#       # Fetchmail complete success uncertain -- for now,
#       #   assume we're successful if we get here
#       success=true
#       # check for outgoing mail in queue before kicking
#       mailq  
#       # rhksendmailq is a file in /bin with permissions -rwsr--r-x root root
#       #   (i.e., owned by root, executable by anyone, and suid) 
#       #   containing /usr/sbin/sendmail -q > /home/dad/temp.txt
#       # to make it more secure, I should consider making it executable by the 
#       #   dad group only (or similar)   
#       rhksendmailq # kick mail queue
#       break  # the while loop
#    else
#       sleep 30 # give modem a chance to connect after pinging
#    fi
# done
# #  check mailq whether connected or not
# mailq  
# # if not success
# # then
# #    log "Mail not retrieved" at date, time
# # fi   


# alternate logic (without goto and added test of mailq):
# dadmail.log must exist before this program is run
# /bin/rm $HOME/dadmail.log
if ! test -e $HOME/dadmail.log ; then touch $HOME/dadmail.log ;  fi  
echo /n >> $HOME/dadmail.log 
echo `date` Starting ipr_getmail.scr >> $HOME/dadmail.log
let "count = 0"
success=false
while let "count <= 3"
do
   let "count = $count + 1"
##   ip address in next line is my ISP's nameserver -- replace
   ping -c 4 206.245.176.211 > $HOME/rhkmailping.txt
   cat $HOME/rhkmailping.txt
   echo `date` Ping results: >> $HOME/dadmail.log
   cat $HOME/rhkmailping.txt >> $HOME/dadmail.log
   echo `date` `grep -i " 0% packet loss" $HOME/rhkmailping.txt` >> $HOME/dadmail.log
   echo `date` `grep -i "wrong" $HOME/rhkmailping.txt` >> $HOME/dadmail.log
   if [[ `grep -i " 0% packet loss" $HOME/rhkmailping.txt` ]] \
#   && ![[ `grep -i "wrong" $HOME/rhkmailping.txt` ]] #Ignore wrong bytes for now
   then
      echo Connected # and no wrong bytes"
      echo `date` Ping successful >> $HOME/dadmail.log
      fetchmail > $HOME/temp.txt
      cat $HOME/temp.txt
      cat $HOME/temp.txt >> $HOME/dadmail.log
      echo `date` Fetchmail complete success uncertain >> $HOME/dadmail.log
      ##      test for fetchmail success and set success = true
##      for now, assume we're successful if we get here
      success=true
##      check for outgoing mail in queue before kicking
##      revise next line for several reasons -- ideally
##         * show mailq output on standard out so it is incorporated
##            in mail from cron
##         * and log to a log file (which file?)
      echo `date` connected -- mailq before sendmail >> $HOME/dadmail.log
      mailq  > $HOME/temp.txt
      cat $HOME/temp.txt
      cat $HOME/temp.txt >> $HOME/dadmail.log
#     rhksendmailq is a file in /bin with permissions -rwsr--r-x root root
#        (i.e., owned by root, executable by anyone, and suid) 
#        containing /usr/sbin/sendmail -q > /home/dad/temp.txt
#     to make it more secure, I should consider making it executable by the 
#        dad group only (or similar)   
      rhksendmailq # kick mail queue
      echo `date` results of sendmail -q >> $HOME/dadmail.log
      cat $HOME/temp.txt
      cat $HOME/temp.txt >> $HOME/dadmail.log
      break  # the while loop
   else
      sleep 30 # give modem a chance to connect after pinging
   fi
done
##      check mailq whether connected or not
echo `date` mailq after sendmail or not connected >> $HOME/dadmail.log
mailq  > $HOME/temp.txt
cat $HOME/temp.txt
cat $HOME/temp.txt >> $HOME/dadmail.log


# if not success
# then
#    log "Mail not retrieved" at date, time
# fi   
 


# echo `date` TEST >> dadmail.log


# an old ping
# ping -c 4 206.245.176.211 | grep -c "0% packet loss"
#  old grep "| grep "64 octets" -A 4 |"

# ping -c 4 206.245.176.211 | grep "64 octets" -A 4 | grep -c "0% Packet Loss"


# Another tidbit:

# if [[ `mailq | tee mailq.txt | grep -c 'is empty'` ]] ; then echo 'yes' ; else echo 'no' ;fi
# cat mailq.txt


# This doesn't work right, sometimes 0% packet loss but wrong bytes
# if [[ `ping -c 4 206.245.176.211 | grep -i " 0% packet loss" | tee temp.txt` ]]
#   then 
#      echo "Not connected" 
#      sleep 30 # give modem a chance to connect after pinging
#   else
#      echo "Connected"