Monitor THANKS telnet response of web server

[rferebee]

Hello,

I need some help figuring out how we would monitor the response to a telnet THANKS command. See details below:

If our mail and web servers are both responding, we still need to know if the LISTSERV application is responding. We can check that with a connection to port 2306 and a simple THANKS command:

-> telnet listserv.org 2306
Trying 167.154.x.x...
Connected to listserv.org.
Escape character is '^]'.
thanks
You're welcome!
quit
Connection closed by foreign host.

Would it be possible to create a check that does this? Thank you.

[jdunitz]

Looks like this might be just the thing:

https://exchange.nagios.org/directory/P ... et/details

Let us know if that works for you!

--Jeffrey

[rferebee]

Is there anyway someone could help me figure out how to write the command for this check_telnet plugin?

It doesn't have a help section written into it.

I just need to be able to send a statement (like THANKS) and check for a response "YOU'RE WELCOME". I'm not sure where to even start.

Thank you!

[jdunitz]

I think I found a better solution: the check_tcp plugin, which lets you specify a thing to say and an thing to expect to receive, just like you want.

Code: Select all

[root@jpd-nagiosxi-one libexec]# ./check_tcp -H localhost -p 25 -s "helo localhost" -e 220
TCP OK - 0.001 second response time on localhost port 25 [220 jpd-nagiosxi-one.localdomain ESMTP Postfix]|time=0.000897s;;;0.000000;10.000000

So for you, you'd want to do:

Code: Select all

./check_tcp -H listserv.org  -p 2306 -s thanks -e YOU

...or whatever the case of the "You're welcome" response is.

Sorry for the misstep--let me know if this one is better!

--Jeffrey

[rferebee]

Do I need to include any quotations or any other characters in the send string and the expect string? I'm getting a timeout when I run this.

I have verified that I can run telnet on port 2306 from the XI server to the host in question. Furthermore, I'm able to send 'thanks' and receive 'You're welcome!' back.

When I try to run check_tcp from my XI server with the variables I think are correct all I get is a blank line response.

See attached image.

[scottwilkerson]

That's not a blank response, you have an unterminated quote since you didn't wrap the response in double quotes

change

Code: Select all

You're welcome!

to

Code: Select all

"You're welcome!"

[rferebee]

Ok, when I do that it times out.

Also, XI keeps adding a a backslash between the e and the !, like this "You're welcome\!". Is that normal/expected?

[scottwilkerson]

Ok, when I do that it times out.

Does it timeout from the command line?

Also, XI keeps adding a a backslash between the e and the !, like this "You're welcome\!". Is that normal/expected?

All ! must be escaped because the Nagios Core configuration uses it as a delimiter to separate commands from arguments

[rferebee]

Yes, the error is CRITICAL - Socket timeout.

[scottwilkerson]

Just curious, do you get a valid result when just checking the port without the send/expect strings?

Code: Select all

./check_tcp -H 167.154.10.63  -p 2306