Python Port Check

[joehms22]

I need a way to check what service a port is running in python, thanks for the help in advance.

[nezachem]

Do you know how to do it in any other language?

[Stefano Mtangoo]

if you know how to do it from CLI then try subprocess

[ShadyTyrant]

You could edit a port scanner for your needs. http://www.coderprofile.com/networks/source-codes/659/python-port-scanner

[joehms22]

Do you know how to do it in any other language?

I know this can be done by a command in *nix systems called nmap, i just need to do it in python, and it to be cross platform to lindows.

[joehms22]

if you know how to do it from CLI then try subprocess

Thanks for the reply,
I only know how to do it in linux using nmap, any ideas on windows?

[SoulMazer]

If you're just doing this for yourself and are not too concerned about efficiency, this should suffice:

from socket import * 

if __name__ == '__main__':
	target = "localhost"
	targetIP = gethostbyname(target)
	print 'Starting scan on host ', targetIP

	#scan reserved ports
	for i in range(20, 1025):
		s = socket(AF_INET, SOCK_STREAM)

		result = s.connect_ex((targetIP, i))

		if(result == 0) :
			print 'Port %d: OPEN' % (i,)
		s.close()

You could always consult Wikipedia's reserved port list to tell what service a user is most likely running.

Also, if you are interested in efficiency (by means of threading), just post back and I'll give you some more code.

[nezachem]

I know this can be done by a command in *nix systems called nmap, i just need to do it in python, and it to be cross platform to lindows.

Question sustains.
Do you have a particular problem with python, or do you need help to understand portmapping in general?

[joehms22]

Clarification: I know how to check what ports are open, I just need a way to know what service a port is running, like ftp, i have a script like SoulMazer posted, I was just hoping there was a better way of identifying what a port is running, like HTTP or FTP rather than checking the port against a list.

[nezachem]

I was just hoping there was a better way of identifying what a port is running

AFAIK, no.

[SoulMazer]

I'm not sure this is possible, but I have had some results with the following:

port = 80
proto = getservbyport(portnum)
print proto

I'm not quite sure why it returns "www", I would expect "http", but maybe Python has a way of translating it. You might have to research it yourself, but I hope this is a help.