How to make a program to listen on a Particular port

palanisaravanan · 04-14-2004, 07:48 AM

I have writen a script .I wanted it to listen on a particular port in my machine.How to do that?.
For eaxmple Every one tried to connect to that port should be welcomed with a message,
#!/bin/bash
echo "welcome to my port"
.How to do that?

hw-tph · 04-14-2004, 10:39 AM

Netcat is a nifty utility that should be used with care. You can have it listening on an arbitrary port (non-reserved if you're not root, of course) and do all sorts of tricks. A trojan in a box.
nc -l -p 62000 < textfile will present the contents of the file "textfile" to everyone who connects to tcp/62000.

Håkan

palanisaravanan · 04-14-2004, 11:08 AM

I am not particular abt textfile.anything like How the progrmmers are making their program listening on particular port.Thats what I want to know.Anyhow Thanks for ur info.I will try that

WeNdeL · 04-14-2004, 12:35 PM

xinetd may help you...

hw-tph · 04-14-2004, 06:43 PM

Then I suggest you check out socket programming in C to get it thoroughly done. Java also provides excellent and very simple classes and methods for networking.

Or you could read up on netcat.

Håkan