python dns模块

dns常见的几种解析类型

使用dnspython 实现dns的查询

安装

pip3 install dnspython

通过 dns.resolver.query来实现dns解析查询

query 参数解释

• qname参数为查询的域名。
• rdtype参数用来指定RR资源的类型，常用的有：A记录、MX记录、CNAME记录、NS记录、PTR记录等。
• rdclass参数用于指定网络类型，可选值有IN、CH、与HS，其中IN为默认，使用最广泛。
• tcp参数用于指定查询是否启用TCP协议，默认为False不启用。
• source与source_port参数作为指定查询源地址与端口，默认值为查询设备IP地址和0。
• raise_on_no_answer参数用于指定当查询无应答时是否触发异常，默认为True。

查询一个A记录

import dns.resolver
domain = 'www.biglittleant.cn'
qtype = 'A'
answer = dns.resolver.query(domain,qtype, raise_on_no_answer=False)
if answer.rrset is not None:
    print(answer.rrset)

结果

biglittleant.github.io. 3600 IN A 185.199.108.153
biglittleant.github.io. 3600 IN A 185.199.109.153
biglittleant.github.io. 3600 IN A 185.199.110.153
biglittleant.github.io. 3600 IN A 185.199.111.153

反向查询，通过ip查询域名

第一步通过 reversename 拿到反转地址

from dns import reversename, resolver
ip = '13.229.188.59' #github.com 的ip
domain_address = reversename.from_address(ip)
print(domain_address)
qtype = 'PTR'
domain_name = str(resolver.query(domain_address, qtype)[0])
print(domain_name)

结果

59.188.229.13.in-addr.arpa.
ec2-13-229-188-59.ap-southeast-1.compute.amazonaws.com.

NS记录查询

这里输入的域名得是二级域名。三级域名会报错。

import dns.resolver

myResolver = dns.resolver.Resolver()
myResolver.nameservers = ['223.5.5.5', '223.6.6.6']
myAnswers = myResolver.query("biglittleant.cn", "NS")
if myAnswers.rrset is not None:
    print(myAnswers.rrset)

myAnswers = myResolver.query("qq.com", "NS")
if myAnswers.rrset is not None:
    print(myAnswers.rrset)

biglittleant.cn. 3600 IN NS dns10.hichina.com.
biglittleant.cn. 3600 IN NS dns9.hichina.com.
qq.com. 3600 IN NS ns2.qq.com.
qq.com. 3600 IN NS ns1.qq.com.
qq.com. 3600 IN NS ns3.qq.com.
qq.com. 3600 IN NS ns4.qq.com.

搜索可知，ns.qq.com 是腾讯的dns服务器，hichina.com 是万网的dns服务器。

biglittleant.cn的解析记录是在阿里云，qq.com的解析记录是在腾讯云

txt 记录

这里输入的域名得是二级域名。三级域名会报错。

import dns.resolver

myResolver = dns.resolver.Resolver()
myAnswers = myResolver.query("qq.com", "TXT")
if myAnswers.rrset is not None:
    print(myAnswers.rrset)

结果

qq.com. 31 IN TXT "v=spf1 include:spf.mail.qq.com -all"

指定dns server 来查询

import dns.resolver

myResolver = dns.resolver.Resolver()
myResolver.nameservers = ['223.5.5.5', '223.6.6.6']
myAnswers = myResolver.query("www.biglittleant.cn", "A")
if myAnswers.rrset is not None:
    print(myAnswers.rrset)

结果

biglittleant.github.io. 600 IN A 185.199.110.153
biglittleant.github.io. 600 IN A 185.199.111.153
biglittleant.github.io. 600 IN A 185.199.109.153
biglittleant.github.io. 600 IN A 185.199.108.153

一种偷懒的写法

import dns.resolver
name = 'wwww.github.com'
for qtype in 'A', 'AAAA', 'CNAME', 'MX', 'NS', 'TXT', 'SOA':
    print(qtype)
    answer = dns.resolver.query(name, qtype,  raise_on_no_answer=False)
    if answer.rrset is not None:
        print(answer.rrset)