通過python的socket模塊中的getaddrinfo進行給定主機/域名的80端口探測

#!/usr/bin/env python3
#-*- encoding:utf8 -*-

import argparse,socket,sys

def connect_to(hostname_or_ip):
    try:
        infolist = socket.getaddrinfo(
            hostname_or_ip,‘www‘,0,socket.SOCK_STREAM,0,
            socket.AI_ADDRCONFIG | socket.AI_V4MAPPED | socket.AI_CANONNAME,
        )
    
 
except socket.gaierror as e:
        print(‘Name service failure:‘, e.args[1])
    info = infolist[0]
    socket_args = info[0:3]
    address = info[4]
    s = socket.socket(*socket_args)
    try:
        s.connect(address)
    except socket.error as e:
        print(‘Network failure‘ , e.args[1])
    
 
else:
        print(‘Success: host‘ , info[3] , ‘is listening on TCP port 80‘)

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description=‘Try connecting to port 80‘)
    parser.add_argument(‘hostname‘ , help=‘hostname that you want to contact‘)
    connect_to(parser.parse_args().hostname)
 

演示：

[email protected]:~/PycharmProjects/networking$ ./getaddr.py google.cn
Success: host google.cn is listening on TCP port 80
[email protected]:~/PycharmProjects/networking$ ./getaddr.py google.hk
Network failure Connection refused
[email protected]:~/PycharmProjects/networking$ ./getaddr.py sina.cn
Success: host sina.cn is listening on TCP port 80
[email protected]:~/PycharmProjects/networking$ ./getaddr.py baidu.com
Success: host baidu.com is listening on TCP port 80
[email protected]:~/PycharmProjects/networking$ ./getaddr.py localhost
Network failure Connection refused
[email protected]:~/PycharmProjects/networking$

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