简介
dnspython – 是python实现的一个DNS工具包,利用其查询功能来实现dns的服务监控及解析结果的校验
安装dnspython
pip install dnspython
使用
常见的DNS解析类型包括A、MX、NS、CNAME
(1)A记录的查询,实例如下:
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
运行输入:www.baidu.com,输出结果如下:
(2)MX记录
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
运行输入:163.com,输出结果如下:
(3)NS记录
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()
输入:baidu.com,输出结果如下:
注意:只限输入一级域名,若输入www.baidu.com是错误的
(4)CNAME记录
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()
输入:www.baidu.com,输出结果如下:
一个综合的例子:
import dns.resolver import httplib iplist = [] # 定义域名IP列表变量 # appdomain = "www.google.com.hk" # 定义业务域名 appdomain = "www.baidu.com" # 定义业务域名 # 域名解析函数,解析成功IP将追加到iplist def get_iplist(domain=""): try: A = dns.resolver.query(domain, 'A') # 解析A记录类型 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) # 定义http连接超时时间(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主机头 r = conn.getresponse() getcontent = r.read(15) # 获取URL页面前15个字符,以便做可用性校验 finally: if getcontent.lower() == "<!doctype html>": # 监控URL页的内容一般是事先定义好,比如“HTTP200”等 print ip + " [OK]" else: print ip + " [Error]" # 此处可放告警程序,可以是邮件、短信通知 if __name__ == "__main__": if get_iplist(appdomain) and len(iplist) > 0: # 条件:域名解析正确且至少要返回一个IP for ip in iplist: checkip(ip) else: print "dns resolver error."
来源:https://www.cnblogs.com/robinunix/p/8434761.html