Today, we are going to implement a simple port scanner implemented in python 3. The code is quite simple, and I think that it doesn’t need any explanation.
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from functools import partial
from multiprocessing import Pool
import socket
import optparse
DEFAULT_CORE_NUMBER = 2
def ping(host, port):
try:
socket.socket().connect((host, port))
return port
except socket.error as err:
return False
def scanPorts(host, ports, cores):
p = Pool(cores)
ping_host = partial(ping, host)
return filter(bool, p.map(ping_host, ports))
def main():
parser = optparse.OptionParser('%prog -t <target host> -p <target port(s)> -n <number of cores>')
parser.add_option('-t', dest='host', type='string', help='Specify the target host')
parser.add_option('-p', dest='ports', type='string', help='Specify the target port(s); Separate them by commas.')
parser.add_option('-n', dest='cores', type='int', help='Specify the number of CPU cores do you want to use.')
(options, args) = parser.parse_args()
if (options.host == None):
print(parser.usage)
exit(0)
else:
host = str(options.host)
if (options.ports == None):
ports = range(1, 65536)
else:
ports = list(map(int, str(options.ports).split(',')))
if (options.cores == None):
cores = DEFAULT_CORE_NUMBER
else:
cores = options.cores
print('\nScanning ports on ' + host + ' ...')
portsScanned = list(scanPorts(host, ports, cores))
print(str(len(portsScanned)) + ' ports available.')
print(portsScanned)
print('\nDone.')
if __name__ == "__main__":
main()
The script has three different options:
- -t: Specify the target host. It is a mandatory option.
- -p: Specify target ports.
- -n: Specify the number of cores that are going to be used.
We can see some invocation examples:
scanner.py
scanner.py -t 127.0.0.1
scanner.py -t 127.0.0.1 -p 21,80 -n 2
See you.
