writing linux port scanner

ilnli · 07-18-2007, 06:32 PM

Hi,

I'm trying to write a port scanner in C for Linux, can any one provide me with a bit of simple port scanner code which can help me? Cause I'm very new to Linux programming and I don't know where to start so a bit of code will be a great help.

regards,
Imran

exvor · 07-18-2007, 07:13 PM

Far as I know its the same as in the windows world when you use sockets.

But I don't have enough experience with this sort of thing maybe someone else here can give you a little more.

ilnli · 07-18-2007, 07:16 PM

the thing is that I'm not a professional programmer so if someone can provide me the code or can help me in any other way in terms of linux then it would be really very helpful for me.

regards
Imran

Tux-Slack · 07-18-2007, 07:16 PM

nmap or Network Mapper is some sort of a port scanner
http://insecure.org/nmap/
And comes with source.

ilnli · 07-19-2007, 06:44 PM

I've seen the code of nmap but that's to complex isn't there a simple port scanner code? which I can look at except nmap.

thank you

regards,
Imran

ghostdog74 · 07-19-2007, 07:39 PM

this is a very very simple port scanner snippet in Python i use to monitor open ports.

Code:

import socket
remote_host="localhost"
for remote_port in [22,901,139]:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.settimeout(60)
        try:
                sock.connect((remote_host, remote_port))
        except Exception,e:
                print "%d closed " % remote_port                
        else: 
                print "%d open" % remote_port
        sock.close()

you can basically do the same in C. As you can see, you have to learn how to code sockets in C.