《Python实现DNS解析查询》

需安装dnspython第三方库，可pip install dnspython

from dns import resolverclass QueryDNSResolver:    """DNS解析，A类、MX、NS、CNAME"""    def __init__(self):        pass    def A_query(self, domain):        try:            A_items = resolver.query(domain, 'A')            for i in A_items.response.answer:                for j in i.items:                    print(j.address)        except resolver.NoAnswer as e:            print(e)    def MX_query(self, domain):        try:            MX_items = resolver.query(domain, 'MX')            for i in MX_items:                print('MX preference =', i.preference, 'main exchanger =', i.exchange)        except resolver.NoAnswer as e:            print(e)    def NS_query(self, domain):        try:            self.__Base_query(domain, 'NS')        except resolver.NoAnswer as e:            print(e)        '''        NS_items = resolver.query(domain, 'NS')        for i in NS_items.response.answer:            for j in i.items:                print(j.to_next())                '''    def CNAME_query(self, domain):        try:            self.__Base_query(domain, 'CNAME')        except resolver.NoAnswer as e:            print(e)        '''        CNAME_items = resolver.query(domain, 'CNAME')        for i in CNAME_items.response.answer:            for j in i.items:                print(j.to_next())                '''    def __Base_query(self, domain, queryMode):        try:            items = resolver.query(domain, queryMode)            for i in items.response.answer:                for j in i.items:                    print(j.to_text())        except resolver.NoAnswer as e:            print(e)    def ALL_query(self, domain):        self.__print_info('A')        self.A_query(domain)        self.__print_info('MX')        self.MX_query(domain)        self.__print_info('NS')        self.NS_query(domain)        self.__print_info('CNAME')        self.CNAME_query(domain)    def __print_info(self, queryMode):        print('====%s====\n' % str(queryMode))def main():    query_ob = QueryDNSResolver()    domain = input('Enter an domain:')    query_ob.ALL_query(domain)if __name__ == '__main__':    main()