reversename.py 文件源码

def from_address(text):
    """Convert an IPv4 or IPv6 address in textual form into a Name object whose
    value is the reverse-map domain name of the address.
    @param text: an IPv4 or IPv6 address in textual form (e.g. '127.0.0.1',
    '::1')
    @type text: str
    @rtype: dns.name.Name object
    """
    try:
        v6 = dns.ipv6.inet_aton(text)
        if dns.ipv6.is_mapped(v6):
            if sys.version_info >= (3,):
                parts = ['%d' % byte for byte in v6[12:]]
            else:
                parts = ['%d' % ord(byte) for byte in v6[12:]]
            origin = ipv4_reverse_domain
        else:
            parts = [x for x in str(binascii.hexlify(v6).decode())]
            origin = ipv6_reverse_domain
    except:
        parts = ['%d' %
                 byte for byte in bytearray(dns.ipv4.inet_aton(text))]
        origin = ipv4_reverse_domain
    parts.reverse()
    return dns.name.from_text('.'.join(parts), origin=origin)