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File Name : 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")

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-04-04 07:56:44
..	dir	-	root/root	0755	2025-12-03 06:02:43
__pycache__	dir	-	root/root	0755	2025-04-04 07:56:44
dnssecalgs	dir	-	root/root	0755	2025-04-04 07:56:44
quic	dir	-	root/root	0755	2025-04-04 07:56:44
rdtypes	dir	-	root/root	0755	2025-04-04 07:56:44
__init__.py	text/x-script.python	1.62 KB	root/root	0644	2025-04-04 07:56:44
_asyncbackend.py	text/x-script.python	2.34 KB	root/root	0644	2025-04-04 07:56:44
_asyncio_backend.py	text/x-script.python	8.84 KB	root/root	0644	2025-04-04 07:56:44
_ddr.py	text/x-script.python	5.12 KB	root/root	0644	2025-04-04 07:56:44
_features.py	text/x-script.python	2.43 KB	root/root	0644	2025-04-04 07:56:44
_immutable_ctx.py	text/x-script.python	2.4 KB	root/root	0644	2025-04-04 07:56:44
_trio_backend.py	text/x-script.python	8.27 KB	root/root	0644	2025-04-04 07:56:44
asyncbackend.py	text/x-script.python	2.73 KB	root/root	0644	2025-04-04 07:56:44
asyncquery.py	text/x-script.python	30.1 KB	root/root	0644	2025-04-04 07:56:44
asyncresolver.py	text/x-script.python	17.43 KB	root/root	0644	2025-04-04 07:56:44
dnssec.py	text/x-script.python	40.74 KB	root/root	0644	2025-04-04 07:56:44
dnssectypes.py	text/x-script.python	1.76 KB	root/root	0644	2025-04-04 07:56:44
e164.py	text/x-script.python	3.88 KB	root/root	0644	2025-04-04 07:56:44
edns.py	text/x-script.python	16.69 KB	root/root	0644	2025-04-04 07:56:44
entropy.py	text/x-script.python	4.14 KB	root/root	0644	2025-04-04 07:56:44
enum.py	text/x-script.python	3.6 KB	root/root	0644	2025-04-04 07:56:44
exception.py	text/x-script.python	5.81 KB	root/root	0644	2025-04-04 07:56:44
flags.py	text/x-script.python	2.69 KB	root/root	0644	2025-04-04 07:56:44
grange.py	text/x-script.python	2.09 KB	root/root	0644	2025-04-04 07:56:44
immutable.py	text/x-script.python	1.97 KB	root/root	0644	2025-04-04 07:56:44
inet.py	text/x-script.python	5.64 KB	root/root	0644	2025-04-04 07:56:44
ipv4.py	text/x-script.python	2.49 KB	root/root	0644	2025-04-04 07:56:44
ipv6.py	text/x-script.python	6.4 KB	root/root	0644	2025-04-04 07:56:44
message.py	text/x-script.python	66.59 KB	root/root	0644	2025-04-04 07:56:44
name.py	text/x-script.python	41.78 KB	root/root	0644	2025-04-04 07:56:44
namedict.py	text/x-script.python	3.91 KB	root/root	0644	2025-04-04 07:56:44
nameserver.py	text/x-script.python	9.88 KB	root/root	0644	2025-04-04 07:56:44
node.py	text/x-script.python	12.37 KB	root/root	0644	2025-04-04 07:56:44
opcode.py	text/x-script.python	2.67 KB	root/root	0644	2025-04-04 07:56:44
py.typed	application/x-empty	0 B	root/root	0644	2025-04-04 07:56:44
query.py	text/x-script.python	54.98 KB	root/root	0644	2025-04-04 07:56:44
rcode.py	text/x-script.python	4.06 KB	root/root	0644	2025-04-04 07:56:44
rdata.py	text/x-script.python	30.29 KB	root/root	0644	2025-04-04 07:56:44
rdataclass.py	text/x-script.python	2.91 KB	root/root	0644	2025-04-04 07:56:44
rdataset.py	text/x-script.python	16.27 KB	root/root	0644	2025-04-04 07:56:44
rdatatype.py	text/x-script.python	7.27 KB	root/root	0644	2025-04-04 07:56:44
renderer.py	text/x-script.python	10.99 KB	root/root	0644	2025-04-04 07:56:44
resolver.py	text/x-script.python	72 KB	root/root	0644	2025-04-04 07:56:44
reversename.py	text/x-script.python	3.74 KB	root/root	0644	2025-04-04 07:56:44
rrset.py	text/x-script.python	8.96 KB	root/root	0644	2025-04-04 07:56:44
serial.py	text/x-script.python	3.52 KB	root/root	0644	2025-04-04 07:56:44
set.py	text/x-script.python	9 KB	root/root	0644	2025-04-04 07:56:44
tokenizer.py	text/x-script.python	23.03 KB	root/root	0644	2025-04-04 07:56:44
transaction.py	text/x-script.python	22.06 KB	root/root	0644	2025-04-04 07:56:44
tsig.py	text/x-script.python	11.15 KB	root/root	0644	2025-04-04 07:56:44
tsigkeyring.py	text/x-script.python	2.57 KB	root/root	0644	2025-04-04 07:56:44
ttl.py	text/x-script.python	2.91 KB	root/root	0644	2025-04-04 07:56:44
update.py	text/x-script.python	11.96 KB	root/root	0644	2025-04-04 07:56:44
version.py	text/plain	1.88 KB	root/root	0644	2025-04-04 07:56:44
versioned.py	text/x-script.python	11.49 KB	root/root	0644	2025-04-04 07:56:44
win32util.py	text/x-script.python	8.67 KB	root/root	0644	2025-04-04 07:56:44
wire.py	text/x-script.python	2.76 KB	root/root	0644	2025-04-04 07:56:44
xfr.py	text/x-script.python	12.96 KB	root/root	0644	2025-04-04 07:56:44
zone.py	text/x-script.python	50.87 KB	root/root	0644	2025-04-04 07:56:44
zonefile.py	text/x-script.python	27.27 KB	root/root	0644	2025-04-04 07:56:44
zonetypes.py	text/x-script.python	690 B	root/root	0644	2025-04-04 07:56:44

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