This is the script

import nmap
import optparsedef nmapScan(tgtHost,tgtPort):nmScan = nmap.PortScanner()nmScan.scan(tgtHost,tgtPort)state=nmScan[tgtHost]['tcp'][int(tgtPort)]['state']print "[*] " + tgtHost + " tcp/"+tgtPort +" "+statedef main():parser = optparse.OptionParser('-H <target host> -p <target port>')parser.add_option('-H', dest='tgtHost', type='string', help='specify target host')parser.add_option('-p', dest='tgtPort', type='string', help='specify target port[s] separated by comma')(options, args) = parser.parse_args()tgtHost = options.tgtHosttgtPorts = str(options.tgtPort).split(',')if (tgtHost == None) | (tgtPorts[0] == None):print parser.usageexit(0)for tgtPort in tgtPorts:nmapScan(tgtHost, tgtPort)if __name__ == '__main__':main()

When I try to enter a range of ports in the command line, I get this error. Could someone help me out? I'm a newbie to python. Thanks in advance!!

    :~$ python nmapScan.py -H 192.168.1.6 -p 20-25
Traceback (most recent call last):File "nmapScan.py", line 27, in <module>main()File "nmapScan.py", line 23, in mainnmapScan(tgtHost, tgtPort)File "nmapScan.py", line 7, in nmapScanstate=nmScan[tgtHost]['tcp'][int(tgtPort)]['state']
ValueError: invalid literal for int() with base 10: '20-25'

You need to distinguish between those two different formats, and if the m-n range format is used, split at '-' to get the boundaries, create the list of port using range(), and set tgtPorts to that range.

Here's a function to implement this. You can simply plug it into your code by doing

tgtPorts = parse_port_spec(options.tgtPort)

instead of your current tgtPorts = str(options.tgtPort).split(','):

def parse_port_spec(spec):if ',' in spec:# Port listports = spec.split(',')elif '-' in spec:# Port rangestart, end = map(int, spec.split('-'))ports = range(start, end + 1)else:# Single portports = [spec]return map(int, ports)

Note however that this still does not support the full nmap port range specification syntax. You can only use a comma separated list, or a range defined by m-n, but not both.

See the documentation for range() and map() for details on how those functions work.