环境说明：linux系统 python 2.6.6
安装：
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wget https://pypi.python.org/packages/b3/e3/091c6489f0b573b8a4069ce956d037061ae9321401c89323386fe748dc9f/dnspython-1.12.0.zip
unzip dnspython-1.12.0.zip
cd dnspython-1.12.0
python setup.py install
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导入模块是：
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import
dns.resolver
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dnsPython模块提供了大量的dns处理方法，最常见的是域名查询，dnsPython提供一个DNS解析类—>resolver，使用它的query方法来实现域名查询功能，query方法定义如下：
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query(
self
,qname,rdtype
=
1
,rdclass
=
1
,tcp
=
False
,source
=
None
,raise_on_no_answer
=
True
,source_port
=
0
)
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其中：qname参数为查询的域名。rdtype参数用来指定RR的资源的类型，常用的有以下几种
| A记录 | 将主机名转化为IP。 |
| MX记录 | 邮件交换记录，定义邮件服务器域名。 |
| CHAME记录 | 指别名记录实现域名间的映射。 |
| NS记录 | 标记区域的域名服务器以及授权子域。 |
| PTR记录 | 反向解析，与A记录相反，将IP转化成主机名。 |
| SOA记录 | SOA标记，一个起始授权区定义。 |
（一）实现A记录例子：
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#!/usr/bin/env python
#-*- coding:utf-8 -*-
# 2017,8,24
import
dns.resolver
domain
=
raw_input
(
'Please input an domain:'
)
A
=
dns.resolver.query(domain,
'A'
)
for
i
in
A.response.answer:
for
j
in
i.items:
print
j.address
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执行结果：以QQ为例子：
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[root
@China
dns]
# python simple1.py
Please input an domain:www.qq.com
61.135.157.156
125.39.240.113
[root
@China
dns]
#
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（二），实现MX记录的例子：
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#!/usr/bin/env python
#-*- coding:utf-8 -*-
# 2017,8,24
import
dns.resolver
domain
=
raw_input
(
'Please input an domain:'
)
MX
=
dns.resolver.query(domain,
'MX'
)
for
i
in
MX:
print
'MX preferce='
,i.preference,
'mail exchaner='
,i.exchange
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以QQ和163为例看结果：
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[root@China dns]
# python simple2.py
Please input an domain:163.com
MX preferce= 10 mail exchaner= 163mx01.mxmail.netease.com.
MX preferce= 50 mail exchaner= 163mx00.mxmail.netease.com.
MX preferce= 10 mail exchaner= 163mx03.mxmail.netease.com.
MX preferce= 10 mail exchaner= 163mx02.mxmail.netease.com.
[
root@China dns]
# python simple2.py
Please input an domain:qq.com
MX preferce= 30 mail exchaner= mx1.qq.com.
MX preferce= 20 mail exchaner= mx2.qq.com.
MX preferce= 10 mail exchaner= mx3.qq.com.
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（三）NS记录例子：
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#!/usr/bin/env python
#-*- coding:utf-8 -*-
# 2017,8,24
import
dns.resolver
domain
=
raw_input
(
'Please input an domain:'
)
ns
=
dns.resolver.query(domain,
'NS'
)
for
i
in
ns.response.answer:
for
j
in
i.items:
print
j.to_text()
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以QQ和百度为例子进行验证：
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[root@China dns]
# python simple3.py
Please input an domain:baidu.com
ns7.baidu.com.
ns2.baidu.com.
ns4.baidu.com.
dns.baidu.com.
ns3.baidu.com.
[root@China dns]
# python simple3.py
Please input an domain:qq.com
ns3.qq.com.
ns1.qq.com.
ns4.qq.com.
ns2.qq.com.
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（四）CNAME例子：
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#!/usr/bin/env python
#-*- coding:utf-8 -*-
# 2017,8,24
import
dns.resolver
domain
=
raw_input
(
'Please input an domain:'
)
cname
=
dns.resolver.query(domain,
'CNAME'
)
for
i
in
cname.response.answer:
for
j
in
i.items:
print
j.to_text()
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应用实例：DNS域名轮循业务监控（参考资料：http://book.51cto.com/art/201411/456723.htm）
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#!/usr/bin/env python
#-*- coding:utf-8 -*-
#2017,8,25
#change dns is ok?
import
dns.resolver
import
os
import
httplib
import
requests
iplist
=
[]
#定义域名IP列表变量
appdomain
=
"www.qq.com"
#定义业务域名
def
get_iplist(domain
=
""):
#域名解析函数，解析成功IP将被追加到iplist
try
:
A
=
dns.resolver.query(domain,
'A'
)
except
Exception,e:
print
"dns resolver error :"
+
str
(e)
return
for
i
in
A.response.answer:
for
j
in
i.items:
iplist.append(j.address)
#追加到iplist
return
True
def
checkip(ip):
checkurl
=
ip
+
":80"
getcontent
=
""
httplib.socket.setdefaulttimeout(
5
)
#定义连接超时时间为5秒
conn
=
httplib.HTTPConnection(checkurl)
#创建http连接对象
try
:
conn.request(
"GET"
,
"/"
,headers
=
{
"Host"
:appdomain})
#发起url请求，添加host头
r
=
conn.getresponse()
getcontent
=
r.status
#获取URL页面状态码
finally
:
if
getcontent
=
=
200
:
print
ip
+
"[ok]"
else
:
print
ip
+
"[error]"
if
__name__
=
=
"__main__"
:
if
get_iplist(appdomain)
and
len
(iplist) >
0
:
for
ip
in
iplist:
checkip(ip)
else
:
print
"dns resolver error"
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执行结果：
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[root@China dns]
# python simple5.py
125.39.240.113[ok]
61.135.157.156[ok]
[root@China dns]
# python simple5.py
61.135.157.156[ok]
125.39.240.113[ok]
[root@China dns]
# python simple5.py
125.39.240.113[ok]
61.135.157.156[ok]
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本文转自 天道酬勤VIP 51CTO博客，原文链接:http://blog.51cto.com/tdcqvip/1958996
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