python实现指定ip端口扫描

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()