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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2025-04-15 12:41
dnssecalgs	[ DIR ]	drwxr-xr-x	2025-04-15 12:41
quic	[ DIR ]	drwxr-xr-x	2025-04-15 12:41
rdtypes	[ DIR ]	drwxr-xr-x	2025-04-15 12:41
__init__.py	1.62 KB	-rw-r--r--	2025-04-15 12:41
_asyncbackend.py	2.34 KB	-rw-r--r--	2025-04-15 12:41
_asyncio_backend.py	8.84 KB	-rw-r--r--	2025-04-15 12:41
_ddr.py	5.12 KB	-rw-r--r--	2025-04-15 12:41
_features.py	2.43 KB	-rw-r--r--	2025-04-15 12:41
_immutable_ctx.py	2.4 KB	-rw-r--r--	2025-04-15 12:41
_trio_backend.py	8.27 KB	-rw-r--r--	2025-04-15 12:41
asyncbackend.py	2.73 KB	-rw-r--r--	2025-04-15 12:41
asyncquery.py	30.1 KB	-rw-r--r--	2025-04-15 12:41
asyncresolver.py	17.43 KB	-rw-r--r--	2025-04-15 12:41
dnssec.py	40.74 KB	-rw-r--r--	2025-04-15 12:41
dnssectypes.py	1.76 KB	-rw-r--r--	2025-04-15 12:41
e164.py	3.88 KB	-rw-r--r--	2025-04-15 12:41
edns.py	16.69 KB	-rw-r--r--	2025-04-15 12:41
entropy.py	4.14 KB	-rw-r--r--	2025-04-15 12:41
enum.py	3.6 KB	-rw-r--r--	2025-04-15 12:41
exception.py	5.81 KB	-rw-r--r--	2025-04-15 12:41
flags.py	2.69 KB	-rw-r--r--	2025-04-15 12:41
grange.py	2.09 KB	-rw-r--r--	2025-04-15 12:41
immutable.py	1.97 KB	-rw-r--r--	2025-04-15 12:41
inet.py	5.64 KB	-rw-r--r--	2025-04-15 12:41
ipv4.py	2.49 KB	-rw-r--r--	2025-04-15 12:41
ipv6.py	6.4 KB	-rw-r--r--	2025-04-15 12:41
message.py	66.59 KB	-rw-r--r--	2025-04-15 12:41
name.py	41.78 KB	-rw-r--r--	2025-04-15 12:41
namedict.py	3.91 KB	-rw-r--r--	2025-04-15 12:41
nameserver.py	9.88 KB	-rw-r--r--	2025-04-15 12:41
node.py	12.37 KB	-rw-r--r--	2025-04-15 12:41
opcode.py	2.67 KB	-rw-r--r--	2025-04-15 12:41
py.typed	0 B	-rw-r--r--	2025-04-15 12:41
query.py	54.98 KB	-rw-r--r--	2025-04-15 12:41
rcode.py	4.06 KB	-rw-r--r--	2025-04-15 12:41
rdata.py	30.29 KB	-rw-r--r--	2025-04-15 12:41
rdataclass.py	2.91 KB	-rw-r--r--	2025-04-15 12:41
rdataset.py	16.27 KB	-rw-r--r--	2025-04-15 12:41
rdatatype.py	7.27 KB	-rw-r--r--	2025-04-15 12:41
renderer.py	10.99 KB	-rw-r--r--	2025-04-15 12:41
resolver.py	72 KB	-rw-r--r--	2025-04-15 12:41
reversename.py	3.74 KB	-rw-r--r--	2025-04-15 12:41
rrset.py	8.96 KB	-rw-r--r--	2025-04-15 12:41
serial.py	3.52 KB	-rw-r--r--	2025-04-15 12:41
set.py	9 KB	-rw-r--r--	2025-04-15 12:41
tokenizer.py	23.03 KB	-rw-r--r--	2025-04-15 12:41
transaction.py	22.06 KB	-rw-r--r--	2025-04-15 12:41
tsig.py	11.15 KB	-rw-r--r--	2025-04-15 12:41
tsigkeyring.py	2.57 KB	-rw-r--r--	2025-04-15 12:41
ttl.py	2.91 KB	-rw-r--r--	2025-04-15 12:41
update.py	11.96 KB	-rw-r--r--	2025-04-15 12:41
version.py	1.88 KB	-rw-r--r--	2025-04-15 12:41
versioned.py	11.49 KB	-rw-r--r--	2025-04-15 12:41
win32util.py	8.67 KB	-rw-r--r--	2025-04-15 12:41
wire.py	2.76 KB	-rw-r--r--	2025-04-15 12:41
xfr.py	12.96 KB	-rw-r--r--	2025-04-15 12:41
zone.py	50.87 KB	-rw-r--r--	2025-04-15 12:41
zonefile.py	27.27 KB	-rw-r--r--	2025-04-15 12:41
zonetypes.py	690 B	-rw-r--r--	2025-04-15 12:41

Rename

# 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")