Find Open Port(s) on Address(es)

So, I was trying to find out which PC on a network (which I was VPN’d into) had VNC running on it. NetBIOS wasn’t working, so I couldn’t access the PC by name. All the tools that I found just didn’t work properly for doing a port scan on a range of addresses over VPN. So, I threw together a portscanner in Python (v2.6.6) really fast.

from socket import *

fTimeOutSec = 1.1
sNetworkAddress = '192.168.1'
aiHostAddresses = range(1,255)
aiPorts = [5900]

setdefaulttimeout(fTimeOutSec)
print "Starting Scan..."
for h in aiHostAddresses:
    for p in aiPorts:
        s = socket(AF_INET, SOCK_STREAM)
        address = ('%s.%d' % (sNetworkAddress, h))
        result = s.connect_ex((address,p))
        if ( 0 == result ):
            print "%s:%d - OPEN" % (address,p)
        elif ( 10035 == result ):
            #do nothing, was a timeout, probably host doesn't exist
            pass
        else:
            print "%s:%d - closed (%d)" % (address,p,result)

        s.close()
print "Scan Completed."

September 30, 2011 | Filed Under Computers, Programming, Python 

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