Python port scanning simple program

The example of this article for you to share the Python port scanning implementation code, for your reference, the specific content is as follows

Get the local IP and port number:

import socket 
 
def get_my_ip(): 
  try: 
    csock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 
    csock.connect(('8.8.8.8', 80)) 
    (addr, port) = csock.getsockname() 
    csock.close() 
    return addr,port 
  except socket.error: 
    return "127.0.0.1" 
 
def int_to_ip(int_ip): 
  return socket.inet_ntoa(struct.pack('I', socket.htonl(int_ip))) 
 
 
def ip_to_int(ip): 
  return socket.ntohl(struct.unpack("I", socket.inet_aton(str(ip)))[0]) 
 
(ip,port)=get_my_ip() 
print "ip=%s port=%d" %(ip,port) 

PortScan.py

#!/usr/bin/python 
# -*- coding: utf-8 -*- 
 
import optparse 
from socket import * 
from threading import * 
 
screenLock = Semaphore(value=1) 
 
def connScan(tgtHost, tgtPort): 
  try: 
    connSkt = socket(AF_INET, 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) 
  except: 
    screenLock.acquire() 
    print '[-] %d/tcp closed' % tgtPort 
  finally: 
  screenLock.release() 
  connSkt.close()  
 
def portScan(tgtHost, tgtPorts): 
  try: 
    tgtIP = gethostbyname(tgtHost) 
  except: 
    print "[-] Cannot resolve '%s': Unknown host" %tgtHost 
    return 
 
  try: 
    tgtName = gethostbyaddr(tgtIP) 
    print '\n[+] Scan Results for: ' + tgtName[0] 
  except: 
    print '\n[+] Scan Results for: ' + tgtIP 
 
  setdefaulttimeout(1) 
  for tgtPort in tgtPorts: 
    t = 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='string',\ 
   help='specify target port[s] separated by comma') 
 
  (options, args) = parser.parse_args() 
 
  tgtHost = options.tgtHost 
  tgtPorts = str(options.tgtPort).split(',') 
 
  if (tgtHost == None) | (tgtPorts[0] == None): 
  print parser.usage 
    exit(0) 
 
  portScan(tgtHost, tgtPorts) 
 
 
if __name__ == '__main__': 
  main()