running script to test telnet connectivity

[Adam Noble]

Hi,

One of my colleagues wants to write a script that tests for connectivity on a specific port.

Obviously if you do a telnet you need to do a control c to break that connection so how can I manage this test within a script.

Cheers

[Georg Tresselt · Accepted solution]

Have a look at the end of this thread:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1052758

Seems to come down to:

>>> The trick here is how to send the ctrl-]. Use this key sequence: ctrl-v ctrl-].
You can use ctrl-v and then any other ctrl sequence to get that exact sequence.

Note that cut-n-paste from this forum will NOT grab the ctrl-C or ctrl-]!! <<<

[Peter Godron]

Adam,
you can use expect to mimik pretty much any input. Even works for scripted passwd.

Available from:
http://hpux.connect.org.uk/hppd/hpux/Tcl/expect-5.43/

[Arturo Galbiati]

Hi,
why snd ctrl-c when a simple quit is enougth?

> telnet localhost 25<

[Kasper Hedensted]

Hi,

This sounds like a job for Nmap:

Nmap download:
http://hpux.connect.org.uk/hppd/hpux/Networking/Admin/nmap-3.93/

Here is the output from a port-scan on port 25:

root@servera:/> nmap -p 25 serverb

Starting nmap V. 2.53 by fyodor@insecure.org ( www.insecure.org/nmap/ )
Interesting ports on serverb:
Port State Service
25/tcp open smtp

Nmap run completed -- 1 IP address (1 host up) scanned in 0 seconds


Regards, Kasper