Shell Programming and Scripting

Change this line ( laststatus "DOWN" ) to ( laststatus "UP" ) and also in else part
from UP to DOWN ... I think should fix it ..

Looks like I have missed the logic.

Please make sure you understand the script which you run on your server ... Any copy paste from internet might cause problem.

Hi chakrapani,

I made the changes as suggested by you, yet i recieve mail "Partner VPN UP again" everytime the script is executed..

I made some changes in the script that i posted in my first post, this is as per my understanding:
Please let me know if the logis is correct or not

[

l=`nmap -P0 -p25 197.7.7.29`
echo $l > /var/log/vpncon.log && echo $l >> /var/log/monscrpt.log
grep -qi "open" /var/log/vpncon.log
j=`echo $?`
if [ $j -ne 0 ]; then
echo -n > /tmp/vpn_failed
echo Partner VPN Failed >> /var/log/monscrpt.log && echo $l | mailx -s "Partner VPN Failed" 'rashmi_pawar@monitor.com
rm /tmp/vpn_failed &> /dev/null && echo Partner VPN Up >> /var/log/monscrpt.log && echo $l | mailx -s "Partner VPN UP" 'aarti_sankhe@cactus.com'
fi

]

the lines in red are added now..

thanks..

Your logic looks ok to me ... does it give you required results ?

---------- Post updated at 06:22 AM ---------- Previous update was at 06:21 AM ----------

can you run the earlier script with set -x option

Just change first line to #!/bin/bash -x and paste the result ...

---------- Post updated at 06:33 AM ---------- Previous update was at 06:22 AM ----------

Now I checked the script with some dummy values. Should work.

Code:

#!/bin/bash
VPNLOG="/var/log/vpncon.log"
MONLOG="/var/log/monscrpt.log"
STATUSFILE=/var/log/VPNSTATUS

# email space seperated
EMAILTO="aarti_sankhe@cactus.com chakrapani@WHATEVER"

function laststatus {
if grep $1  $STATUSFILE
then
  exit 0
fi
  exit 1
}

nmap -P0 -p25 199.8.7.29 > $VPNLOG
cat $VPNLOG >> $MONLOG
if grep -qi "open" $VPNLOG;
then
   echo "Partner VPN OK " >> $MONLOG
  ( laststatus "UP" ) &&  ( echo "VPN UP" ) || ( mailx -s "Partner VPN UP" $EMAILTO < $VPNLOG; echo "UP" > $STATUSFILE )
else
   echo "Partner VPN Failed" >> $MONLOG
  ( laststatus "DOWN" ) &&  ( echo "VPN DOWN" ) || ( mailx -s "Partner VPN DOWN" $EMAILTO < $VPNLOG; echo "DOWN" > $STATUSFILE )
fi

Run the code directly on the shell couple of times with -x options and then check if it gives you requied results.

---------- Post updated at 07:36 AM ---------- Previous update was at 06:33 AM ----------

One problem with you logic ... You are creating file and then checking file every time ... I dont understand that part ... The flag you are setting will not work ..

Hi chakrapani,

here is the output of the script, i added -x in the first line of the script .e.m #!/bin/bash

[root@mx1 sbin]# ./partner-vpn.sh
+ VPNLOG=/var/log/vpncon.log
+ MONLOG=/var/log/monscrpt.log
+ STATUSFILE=/var/log/VPNSTATUS
+ EMAILTO=rashmi_pawar@monitor.com
+ nmap -P0 -p25 197.7.7.29
+ cat /var/log/vpncon.log
+ grep -qi open /var/log/vpncon.log
+ echo 'Partner VPN OK '
+ laststatus UP
+ grep UP /var/log/VPNSTATUS
+ exit 1
+ echo UP

Is this the output of the last one ? version 3 may be

Because it looks ok to me ... Just try and do a simple test

$ echo "DOWN" > /var/log/VPNSTATUS

Now you should get a mail after 5 mins ... that is it up ... Dont make any changes and you should not get the UP mail ...

if possible change the command .. nmap -P0 -p25 197.7.7.29 in the script to get a DOWN result ... and check that again you should get DOWN mail once and then no mails ...

Hopefully this is sorted your problem..

Hi Chakrapani,

Thanks for the help. I need to mention again how the script should run. I need to write a script wherein i should recieve a mail when the VPN is down and when the vpn comes up i should a notification mail that the vpn is back up..That means i need to recieve email only twice, first when the vpn goes down and second when the vpn comes up..cron will run this script every 5 minutes..if the vpn goes down for 20 minutes the email stating "Partner VPN down" should be recieved 4 times, and the script is working as expected when the vpn goes down.. once the vpn is up only one email should be received that the vpn is back up.
I tried running the script you wrote for me, it sends an email that the "VPN is up" every time the script is executed..So the script should be modified in such a way that i should recieve "VPN UP" mail only once when it is back up...
Thanks.