golden hour

/lib/python3.9/site-packages/dns

File/Folder	Size	Actions
__init__.py	1.62 KB
__pycache__	-
_asyncbackend.py	2.3 KB
_asyncio_backend.py	8.76 KB
_ddr.py	5.12 KB
_features.py	2.33 KB
_immutable_ctx.py	2.4 KB
asyncbackend.py	2.73 KB
asyncquery.py	26.22 KB
asyncresolver.py	17.43 KB
dnssec.py	39.74 KB
dnssecalgs	-
dnssectypes.py	1.76 KB
e164.py	3.88 KB
edns.py	14.91 KB
entropy.py	4.14 KB
enum.py	3.6 KB
exception.py	5.82 KB
flags.py	2.69 KB
grange.py	2.1 KB
immutable.py	1.97 KB
inet.py	5.64 KB
ipv4.py	2.49 KB
ipv6.py	6.45 KB
message.py	64.45 KB
name.py	41.67 KB
namedict.py	3.91 KB
nameserver.py	9.68 KB
node.py	12.37 KB
opcode.py	2.67 KB
query.py	53.55 KB
quic	-
rcode.py	4.06 KB
rdata.py	28.77 KB
rdataclass.py	2.91 KB
rdataset.py	16.36 KB
rdatatype.py	7.17 KB
rdtypes	-
renderer.py	10.99 KB
resolver.py	71.83 KB
reversename.py	3.74 KB
rrset.py	8.96 KB
serial.py	3.52 KB
set.py	8.88 KB
tokenizer.py	23.03 KB
transaction.py	22.11 KB
tsig.py	11.15 KB
tsigkeyring.py	2.57 KB
ttl.py	2.91 KB
update.py	11.96 KB
version.py	1.88 KB
versioned.py	11.49 KB
win32util.py	8.89 KB
wire.py	2.76 KB
xfr.py	12.96 KB
zone.py	50.87 KB
zonefile.py	27.27 KB
zonetypes.py	690 B

Edit: reversename.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2006-2017 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."""

import binascii

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

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

def from_address(
    text: str,
    v4_origin: dns.name.Name = ipv4_reverse_domain,
    v6_origin: dns.name.Name = ipv6_reverse_domain,
) -> dns.name.Name:
    """Convert an IPv4 or IPv6 address in textual form into a Name object whose
    value is the reverse-map domain name of the address.

*text*, a ``str``, is an IPv4 or IPv6 address in textual form
    (e.g. '127.0.0.1', '::1')

*v4_origin*, a ``dns.name.Name`` to append to the labels corresponding to
    the address if the address is an IPv4 address, instead of the default
    (in-addr.arpa.)

*v6_origin*, a ``dns.name.Name`` to append to the labels corresponding to
    the address if the address is an IPv6 address, instead of the default
    (ip6.arpa.)

Raises ``dns.exception.SyntaxError`` if the address is badly formed.

Returns a ``dns.name.Name``.
    """

try:
        v6 = dns.ipv6.inet_aton(text)
        if dns.ipv6.is_mapped(v6):
            parts = ["%d" % byte for byte in v6[12:]]
            origin = v4_origin
        else:
            parts = [x for x in str(binascii.hexlify(v6).decode())]
            origin = v6_origin
    except Exception:
        parts = ["%d" % byte for byte in dns.ipv4.inet_aton(text)]
        origin = v4_origin
    return dns.name.from_text(".".join(reversed(parts)), origin=origin)

def to_address(
    name: dns.name.Name,
    v4_origin: dns.name.Name = ipv4_reverse_domain,
    v6_origin: dns.name.Name = ipv6_reverse_domain,
) -> str:
    """Convert a reverse map domain name into textual address form.

*name*, a ``dns.name.Name``, an IPv4 or IPv6 address in reverse-map name
    form.

*v4_origin*, a ``dns.name.Name`` representing the top-level domain for
    IPv4 addresses, instead of the default (in-addr.arpa.)

*v6_origin*, a ``dns.name.Name`` representing the top-level domain for
    IPv4 addresses, instead of the default (ip6.arpa.)

Raises ``dns.exception.SyntaxError`` if the name does not have a
    reverse-map form.

Returns a ``str``.
    """

if name.is_subdomain(v4_origin):
        name = name.relativize(v4_origin)
        text = b".".join(reversed(name.labels))
        # run through inet_ntoa() to check syntax and make pretty.
        return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))
    elif name.is_subdomain(v6_origin):
        name = name.relativize(v6_origin)
        labels = list(reversed(name.labels))
        parts = []
        for i in range(0, len(labels), 4):
            parts.append(b"".join(labels[i : i + 4]))
        text = b":".join(parts)
        # run through inet_ntoa() 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")