Python之DNS

DNS

dnspython(http://www.dnspython.org/) 是Python實現(xiàn)的一個DNS工具包禽翼，它支持幾乎所有的記錄類型屠橄，可以用于查詢、傳輸并動態(tài)更新ZONE信息闰挡，同時支持TSIG(事務(wù)簽名)驗證消息和EDNS0(擴展DNS).在系統(tǒng)方面,我們可以利用其查詢功能來實現(xiàn)DNS服務(wù)監(jiān)控以及解析結(jié)果的校驗,可以代替nslookup及dig等工具锐墙，輕松做到與現(xiàn)有平臺的整合

安裝

pip install dnspython

DNS記錄解析

A記錄，將主機名轉(zhuǎn)換成IP地址
MX記錄长酗，郵件交換記錄溪北，定義郵件服務(wù)器的域名
CNAME記錄，指別名記錄花枫，實現(xiàn)域名間的映射
NS記錄刻盐，標記區(qū)域的域名服務(wù)器及授權(quán)子域
PTR記錄，反向解析劳翰，與A記錄相反敦锌，將IP轉(zhuǎn)換成主機名
SOA記錄，SOA標記佳簸，一個起始授權(quán)區(qū)的定義

A記錄

# codeing=utf-8
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

MX記錄

# coding=utf-8

import dns.resolver
domain = raw_input('Please input an domain: ')

MX = dns.resolver.query(domain, 'MX')
for i in MX:
    print 'MX preference =', i.preference, 'mail exchanger =', i.exchange

Please input an domain: 163.com      
MX preference = 10 mail exchanger = 163mx02.mxmail.netease.com.
MX preference = 10 mail exchanger = 163mx01.mxmail.netease.com.
MX preference = 50 mail exchanger = 163mx00.mxmail.netease.com.
MX preference = 10 mail exchanger = 163mx03.mxmail.netease.com.

NS記錄

# coding=utf-8
import dns.resolver
print '*************NS****************'
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()
        
*************NS****************
Please input an domain: baidu.com
ns4.baidu.com.
dns.baidu.com.
ns2.baidu.com.
ns7.baidu.com.
ns3.baidu.com.

CNAME記錄

# coding=utf-8
import dns.resolver
print '****************CNAME****************'
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()

****************CNAME****************
Please input an domain: www.baidu.com
www.a.shifen.com.

綜合案例


import dns.resolver
import httplib
 
iplist = []  # 定義域名IP列表變量
# appdomain = "www.google.com.hk"  # 定義業(yè)務(wù)域名
appdomain = "www.baidu.com"  # 定義業(yè)務(wù)域名
 
# 域名解析函數(shù)乙墙，解析成功IP將追加到iplist
def get_iplist(domain=""):
    try:
        A = dns.resolver.query(domain, 'A')  # 解析A記錄類型
    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)  # 定義http連接超時時間(5秒)
    conn = httplib.HTTPConnection(checkurl)  # 創(chuàng)建http連接對象
 
    try:
        conn.request("GET", "/", headers={"Host": appdomain})  # 發(fā)起URL請求颖变，添加host主機頭
        r = conn.getresponse()
        getcontent = r.read(15)  # 獲取URL頁面前15個字符，以便做可用性校驗
    finally:
        if getcontent.lower() == "<!doctype html>":  # 監(jiān)控URL頁的內(nèi)容一般是事先定義好听想，比如“HTTP200”等
            print ip + " [OK]"
        else:
            print ip + " [Error]"  # 此處可放告警程序腥刹，可以是郵件、短信通知
 
 
if __name__ == "__main__":
    if get_iplist(appdomain) and len(iplist) > 0:  # 條件：域名解析正確且至少要返回一個IP
        for ip in iplist:
            checkip(ip)
    else:
        print "dns resolver error."

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