准备工作
- 环境：Ubuntu 14.04 32bit
- 工具：dnspython
对应的shell工具：nslookup dig等 -
dns预备知识：
常用资源记录RR（Resource Records）类型
A记录： 主机名–> IP地址
MX记录： 定义邮件服务器域名
CNAME： 域名间映射
PTR： IP地址 –>主机名（反向解析）更详细介绍参考博文《 [DNS]常见资源记录定义（Resource Record) 》
用法举例
- 查询A记录
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import dns.resolver domain = raw_input('input an domain:') A = dns.resolver.query(domain, 'A') for i in A.response.answer: for j in i.items: if 'address' in dir(j): print j.address else: print 'failed to resolver' |
- 查询MX记录
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MX = dns.resolver.query(domain, 'MX') for i in MX: print 'MX preference =', i.preference, 'mail exchanger =', i.exchange |
- 域名轮询监控
step1:查询A记录
step2:对ip进行http监测
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import httplib import os import dns.resolver iplist = [] domain = "www.xidian.edu.cn" def get_iplist(domain=""): 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: if 'address' in dir(j): iplist.append(j.address) return True def checkip(ip): checkurl = ip + ':80' getcontent = '' httplib.socket.setdefaulttimeout(5) conn = httplib.HTTPConnection(checkurl) try: conn.request("GET", "/", headers = {"Host": domain}) r = conn.getresponse() getcontent = r.read(17) finally: #print getcontent[3:] if getcontent[3:] == " print ip + "\t[OK]" else: print ip + "\t[ERROR]" if __name__ == "__main__": if get_iplist(domain) and len(iplist) > 0: for ip in iplist: print ip checkip(ip) else: print "dns resolver error." |