Service(Port) Monitoring with Telnet/Ftp/NC(netcat)

--- Sébastien Bonnet <[email protected]>
wrote:

> There's something call nc (for netcat) which might
> be way more suitable.

Hi all,

Ok I modified my port checking shell script to have
telnet, ftp, and nc (netcat) options.  Just use the
script below and comment out the TEST= line you want.
I found that nc works the best to avoid unwanted
errors logged in your mail or message log.  You can
also replace "25" with $2 and run the script with two
parameters, host and portnumber, but then depending on
port, you have to replace your printf string with
valid commands, and your grep string with proper
keyword.  In all honest, only nc was able to correctly
pass the commands (ftp and telnet lines did not accept
the commands from printf).  If you use nc, you need to
install the nc or netcat rpm.  

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#!/bin/sh

## PB's Nutshell Howto - Custom Port Monitoring.

TEST=`printf "helo foobar.com\nmail from:
[email protected]\nquit\n" | nc -v $1 25 2>/dev/null
|grep -i "sender ok"|wc -l` > /dev/null 2>&1

#TEST=`printf "quit\n" | ftp -v -u $1 25 2>/dev/null
|grep -i "connected"|wc -l` > /dev/null 2>&1

#TEST=`printf "quit\n" | telnet $1 25 2>/dev/null
|grep -i "connected"|wc -l` > /dev/null 2>&1

if [ $TEST -eq 1 ]; then
        echo "OK"
else
        echo "FAIL"
fi
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Peter

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