在Linux中判断一台主机是否可达，可以使用ping命令，而判断端口是否打开，可以使用telnet命令，但是telnet命令没有超时时间的参数，使用起来不是很方便，那么可以利用Python来完成一个端口扫描的功能

socket实现端口扫描

#!/usr/bin/env python

import socket

def get_ip_status(ip,port):
  server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  try:
    server.connect((ip,port))
    print('{0} port {1} is open'.format(ip, port))
  except Exception as err:
    print('{0} port {1} is not open'.format(ip,port))
  finally:
    server.close()

if __name__ == '__main__':
  host = '10.0.0.11'
  for port in range(20,100):
    get_ip_status(host,port)

telnetlib实现端口扫描

import telnetlib

def get_ip_status(ip,port):
  server = telnetlib.Telnet()   # 创建一个Telnet对象
  try:
    server.open(ip,port)     # 利用Telnet对象的open方法进行tcp链接
    print('{0} port {1} is open'.format(ip, port))
  except Exception as err:
    print('{0} port {1} is not open'.format(ip,port))
  finally:
    server.close()

if __name__ == '__main__':
  host = '10.0.0.11'
  for port in range(20,100):
    get_ip_status(host,port)

多线程实现高效扫描

#!/usr/bin/env python

import telnetlib
import threading

def get_ip_status(ip,port):
  server = telnetlib.Telnet()
  try:
    server.open(ip,port)
    print('{0} port {1} is open'.format(ip, port))
  except Exception as err:
    print('{0} port {1} is not open'.format(ip,port))
  finally:
    server.close()

if __name__ == '__main__':
  host = '10.0.0.11'
  threads = []
  for port in range(20,100):
    t = threading.Thread(target=get_ip_status,args=(host,port))
    t.start()
    threads.append(t)

  for t in threads:
    t.join()

以上这篇python实现指定ip端口扫描方式就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持python博客。