port_scan.py

#!/usr/bin/env python3
#-*- coding:utf-8 -*-
#port_scan_multithread


import optparse
import socket
import threading

screenLock = threading.Semaphore(value=1)

def connScan(tgtHost, tgtPort):
    try:
        connSkt = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        connSkt.connect((tgtHost,tgtPort))
        connSkt.send('ViolentPython\r\n')
        results = connSkt.recv(100)
        screenLock.acquire()
        print('[+] %d/tcp open' % tgtPort)
        print('[+] ' + str(results))
        #connSkt.close()
    except:
        screenLock.acquire()
        print('[-] %d/tcp closed' % tgtPort)
    finally:
        screenLock.release()
        connSkt.close()

def portScan(tgtHost,tgtPorts):
    try:
        tgtIP = socket.gethostbyname(tgtHost)
    except:
        print('[-] Cannot resolve "%s": Unknown host' % tgtHost)
        return

    try:
        tgtName = socket.gethostbyaddr(tgtIP)
        print('\n[+] Scan Results for: ' + tgtName[0])
    except:
        print('\n[+] Scan Results for: ' + tgtIP)

    socket.setdefaulttimeout(1)

    for tgtPort in tgtPorts:
        print('Scanning port ' + str(tgtPort))
        #connScan(tgtHost, int(tgtPort))
        t = threading.Thread(target=connScan, args=(tgtHost, int(tgtPort)))
        t.start()

def main():
    parser = optparse.OptionParser('usage %prog -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='int', help='specify target port')
    (options, args) = parser.parse_args()
    tgtHost = options.tgtHost
    tgtPort = options.tgtPort
    args.append(tgtPort)
    if (tgtHost == None) | (tgtPort == None):
        print('[-] You must specify a target host and port[s]!')
        exit(0)
    portScan(tgtHost, args)

if __name__ == '__main__':
    main()