python dns协议重写

最新推荐文章于 2024-10-21 14:18:17 发布

原创最新推荐文章于 2024-10-21 14:18:17 发布 · 2k 阅读

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该博客介绍了如何使用Python进行DNS查询，从而独立于本地DNS设置进行操作。

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可以指定dns查询，脱离本地dns设置。

import socket,os,re
def dns_remote_resolve(qname, dnsserver, timeout=None, blacklist=set(), max_retry=2, max_wait=2):
        for i in xrange(max_retry):
            index = os.urandom(2)
            host = ''.join(chr(len(x))+x for x in qname.split('.'))
            data = '%s\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00%s\x00\x00\x01\x00\x01' % (index, host)
            address_family = socket.AF_INET6 if ':' in dnsserver else socket.AF_INET
            sock = None
            try:
                sock = socket.socket(family=address_family, type=socket.SOCK_DGRAM)
                if isinstance(timeout, (int, long)):
                    sock.settimeout(timeout)
                sock.sendto(data, (dnsserver, 53))
                for i in xrange(max_wait):
                    data = sock.recv(512)
                    iplist = ['.'.join(str(ord(x)) for x in s) for s in re.findall('\xc0.\x00\x01\x00\x01.{6}(.{4})', data) if all(ord(x)<=255 for x in s)]
                    iplist = [x for x in iplist if x not in blacklist]
                    if iplist:
                        return iplist
            except socket.error as e:
                if e[0] in (10060, 'timed out'):
                    continue
            except Exception, e:
                raise
            finally:
                if sock:
                    sock.close()

print dns_remote_resolve('www.baidu.com','8.8.8.8')