14.4. DNS处理模块dnspython

14.4.1. 源码安装

首先介绍dnspython 模块的安装， 这里采用源码的安装方式，最新版本为1.9.4,如下：
wget http://www.dnspython.org/kits/1.9.4/dnspython-1.9.4.tar.gz

tar zxvf dnspython-1.9.4.tar.gz
cd dnspython-1.9.4
python setup.py install
python -c "import dns"

14.4.2. pip安装

pip install dnspython

eg

#!/usr/bin/env python
# -*- coding:utf8 -*-
# auther; 18793
# Date：2019/4/17 12:43
# filename: test.py
import dns.resolver

domain = "www.baidu.com"
A_domain_list = []
A = dns.resolver.query(domain, 'A')
for i in A.response.answer:
    for j in i:
        if j.rdtype == 1:
            A_domain_list.append(j)
for index, A_jilu in enumerate(A_domain_list):
    print(domain + "的第{}条A记录为：{}".format(index, A_jilu))




# （2）MX记录，邮件交换记录，定义邮件服务器的域名
import dns.resolver

mx = dns.resolver.query('163.com', 'MX')
for i in mx.response.answer:
    for j in i:
        print(j)

eg

#!/usr/bin/env python
# -*- coding:utf8 -*-
# auther; 18793
# Date：2019/4/17 11:03
# filename: Dns模块.py

# 检测ip域名是否正常
# 1)实现对域名解析，然后将A记录追加到list
# 2)对IP列表中的ip实现HTTP级别的探测

import os
import dns.resolver
import socket

list_ip = []
appdomain = "www.baidu.com"  # 定义域名


def get_ip_list(domain=""):
    try:
        A = dns.resolver.query(domain, "A")
    except Exception as e:
        print("dns resolver error: " + str(e))
        return
    for i in A.response.answer:
        for j in i.items:
            if j.rdtype == 1:
                list_ip.append(j)
    return True


def checkip(address, port=80):
    s = socket.socket()
    print('Attempting to connect to %s on port %s' % (address, port))
    try:
        s.connect((address, port))
        print('Connected to %s on port %s status                  【OK】' % (address, port))
        print()
        return True
    except socket.error as e:
        print('Connection to %s on port %s 【failed】: %s' % (address, port, e))
        return False
    finally:
        s.close()


if __name__ == '__main__':
    if get_ip_list(appdomain) and len(list_ip) > 0:
        for i in list_ip:
            checkip(str(i))
    else:
        print("DNS resolver error........")

输出结果如下：

Attempting to connect to 220.181.111.37 on port 80
Connected to 220.181.111.37 on port 80 status                  【OK】

Attempting to connect to 220.181.112.244 on port 80
Connected to 220.181.112.244 on port 80 status                  【OK】

http.client模块参考