Python socket库的常用方式

1. 根据域名解析ip地址

import socket

domain = 'baidu.com'
getaddrinfo = socket.getaddrinfo(domain,'https')
print(getaddrinfo)

运行结果：

2. 解析ssl证书的DNS记录获取子域名

import ssl
import socket


domain = 'baidu.com'
try:
    ctx = ssl.create_default_context()
    sock = socket.socket()
    sock.settimeout(10)
    wrap_sock = ctx.wrap_socket(sock, server_hostname=domain)
    wrap_sock.connect((domain, 443))
    cert_dict = wrap_sock.getpeercert()
    print(wrap_sock)
    for k,v in cert_dict.items():
        print('{}:{}'.format(k,v))
except Exception as e:
    print(e)

运行结果：