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?? ..
?? __init__.py(1.3 KB)
?? __pycache__
?? _compat.py(1.28 KB)
?? dnssec.py(14.44 KB)
?? e164.py(3.07 KB)
?? edns.py(4.28 KB)
?? entropy.py(4.36 KB)
?? exception.py(4.52 KB)
?? flags.py(2.6 KB)
?? grange.py(1.93 KB)
?? hash.py(1.07 KB)
?? inet.py(3.17 KB)
?? ipv4.py(1.98 KB)
?? ipv6.py(5.17 KB)
?? message.py(42.12 KB)
?? name.py(28.74 KB)
?? namedict.py(3.59 KB)
?? node.py(5.91 KB)
?? opcode.py(2.48 KB)
?? query.py(19.18 KB)
?? rcode.py(3.03 KB)
?? rdata.py(14.65 KB)
?? rdataclass.py(3.18 KB)
?? rdataset.py(11.29 KB)
?? rdatatype.py(5.21 KB)
?? rdtypes
?? renderer.py(11.64 KB)
?? resolver.py(50.88 KB)
?? reversename.py(3.23 KB)
?? rrset.py(5.85 KB)
?? set.py(7.53 KB)
?? tokenizer.py(17.88 KB)
?? tsig.py(7.54 KB)
?? tsigkeyring.py(1.7 KB)
?? ttl.py(2.23 KB)
?? update.py(9.78 KB)
?? version.py(1.23 KB)
?? wiredata.py(3.64 KB)
?? zone.py(39.09 KB)

Editing: reversename.py

# Copyright (C) 2006, 2007, 2009-2011 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""DNS Reverse Map Names.

@var ipv4_reverse_domain: The DNS IPv4 reverse-map domain, in-addr.arpa.
@type ipv4_reverse_domain: dns.name.Name object
@var ipv6_reverse_domain: The DNS IPv6 reverse-map domain, ip6.arpa.
@type ipv6_reverse_domain: dns.name.Name object
"""

import binascii
import sys

import dns.name
import dns.ipv6
import dns.ipv4

ipv4_reverse_domain = dns.name.from_text('in-addr.arpa.')
ipv6_reverse_domain = dns.name.from_text('ip6.arpa.')

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 Exception:
        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)

def to_address(name):
    """Convert a reverse map domain name into textual address form.
    @param name: an IPv4 or IPv6 address in reverse-map form.
    @type name: dns.name.Name object
    @rtype: str
    """
    if name.is_subdomain(ipv4_reverse_domain):
        name = name.relativize(ipv4_reverse_domain)
        labels = list(name.labels)
        labels.reverse()
        text = b'.'.join(labels)
        # run through inet_aton() to check syntax and make pretty.
        return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))
    elif name.is_subdomain(ipv6_reverse_domain):
        name = name.relativize(ipv6_reverse_domain)
        labels = list(name.labels)
        labels.reverse()
        parts = []
        i = 0
        l = len(labels)
        while i < l:
            parts.append(b''.join(labels[i:i + 4]))
            i += 4
        text = b':'.join(parts)
        # run through inet_aton() to check syntax and make pretty.
        return dns.ipv6.inet_ntoa(dns.ipv6.inet_aton(text))
    else:
        raise dns.exception.SyntaxError('unknown reverse-map address family')

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