Python端口扫描简单程序

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()

#!/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()