erauqssidlroweht

I'm kinda a newbie to programming, so I'll apologize in advance. I'm trying to write a bash script that will go out and test my servers and make sure they are still happily working away. In the event the are not working as I think they should I want the script to call my pager. (Pager script works fine btw.)

I'm coming into problems in more ways than one. After I have connected to the remote service I can't figure out how to exit from the telnet session.
I.E. The mail server expects a response. HELO response. I just want to quit and grep the session. (See below)

Secondly I seem to be getting an EOF (unexpected end of file) error message after trying to execute this script. I've looked over the syntax and I am just so new to this I can’t see what I’ve done wrong.

Any help and guidance would be much appreciated.

-------Begin Script-------
#!/bin/sh

#List of Servers to Check
#Insert spaces to separate multiple entries
EMAIL="192.168.1.10"
DNS="192.168.1.5"
ROUTER="192.168.1.1 192.168.1.2"

#For Every Email value telnet to port 25 and make sure everything is normal
for SYS in $EMAIL; do CHECKMAIL=`telnet $SYS 25 | grep -o "Connected"`
if [ $CHECKMAIL -ne "Connected" ] ; then
/PAGER/911dial.sh
fi

#For every DNS server check to see if it can resolve www.google.com
for SYS2 in $DNS; do DNSLOOKUP=`dig @$SYS2 www.google.com | grep -o "answer"`
if [ $DNSLOOKUP -ne "answer" ] ; then
/PAGER/911dial.sh
fi

#Telnet to routers and double check they are active VIA Inband connection
for SYS3 in $ROUTER; do TELNET=`telnet $SYS3 | grep -o "Password:"`
if [ $TELNET -ne "Password:" ] ; then
/PAGER/911dial.sh
fi
done

#End of Critical Service Check
-------End Script-------

jim mcnamara

You can create a function to do the connect and quit for telnet like this

I did not test this code, you need to check it.

mackenga

If you want to interact with network services like Telnet, life is a lot easier if you use expect. See http://expect.nist.gov/ for more information.

(To terminate your telnet session, I believe you usually send a control-closed-square-bracket or something like that, which should leave you talking to the telnet program rather than the mailserver; then you can send the quit command to the telnet client; don't hold me to that though!)

jim mcnamara

mack is right, except a lot of unixes do not have expect - linux usually does.
You can download it from the expect homepage:

http://expect.nist.gov/

erauqssidlroweht

I didn't have Expect installed so I went ahead installed and have been working with it for the week or so.

I've successfully writen a two part script. And later I expanded on this concept for every service I have.

#!/bin/sh
#Debian Linux
# Check if SMTP is up
/PAGER/smtp.exp 1>/dev/null 2>&1
if [ $? == 0 ]
then
echo "SMTP is running."
else
echo "SMTP is NOT running. Calling for help..."
/PAGER/911dial.sh
fi
#Exit


#!/usr/bin/expect -f
#The second part
set timeout 4
spawn telnet 192.168.1.10 25
expect "220 "
send "quit\r"


Thanks everyone for your help and direction.