Gecko [ tsuru-no-tsurugi.tokyo ]

Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2024-09-07 23:29
rdtypes	[ DIR ]	drwxr-xr-x	2024-09-07 23:28
__init__.py	1.56 KB	-rw-r--r--	2020-10-24 23:17
_asyncbackend.py	1.53 KB	-rw-r--r--	2020-08-19 21:18
_asyncio_backend.py	4.34 KB	-rw-r--r--	2020-10-24 23:17
_curio_backend.py	3.33 KB	-rw-r--r--	2020-10-24 23:17
_immutable_attr.py	2.92 KB	-rw-r--r--	2020-10-24 23:17
_immutable_ctx.py	2.4 KB	-rw-r--r--	2020-10-24 23:17
_trio_backend.py	3.68 KB	-rw-r--r--	2020-10-24 23:17
asyncbackend.py	3 KB	-rw-r--r--	2020-10-24 23:17
asyncquery.py	17.4 KB	-rw-r--r--	2020-10-24 23:17
asyncresolver.py	8.71 KB	-rw-r--r--	2020-10-24 23:17
dnssec.py	19.19 KB	-rw-r--r--	2020-10-24 23:17
e164.py	3.6 KB	-rw-r--r--	2020-08-17 01:59
edns.py	10.72 KB	-rw-r--r--	2020-10-24 23:17
entropy.py	4.07 KB	-rw-r--r--	2020-08-17 01:59
enum.py	2.75 KB	-rw-r--r--	2020-10-24 23:17
exception.py	5.13 KB	-rw-r--r--	2020-10-24 23:17
flags.py	2.58 KB	-rw-r--r--	2020-10-24 23:17
grange.py	2.04 KB	-rw-r--r--	2020-10-24 23:17
immutable.py	1.97 KB	-rw-r--r--	2020-10-24 23:17
inet.py	4.74 KB	-rw-r--r--	2020-10-24 23:17
ipv4.py	1.93 KB	-rw-r--r--	2020-08-17 01:59
ipv6.py	5.92 KB	-rw-r--r--	2020-10-24 23:17
message.py	52.73 KB	-rw-r--r--	2021-01-05 04:29
name.py	31.54 KB	-rw-r--r--	2020-10-24 23:17
namedict.py	3.83 KB	-rw-r--r--	2020-08-17 01:59
node.py	6.42 KB	-rw-r--r--	2020-10-24 23:17
opcode.py	2.58 KB	-rw-r--r--	2021-01-05 03:22
py.typed	0 B	-rw-r--r--	2020-06-27 03:20
query.py	40.46 KB	-rw-r--r--	2020-10-24 23:17
rcode.py	3.9 KB	-rw-r--r--	2021-01-05 03:23
rdata.py	24.32 KB	-rw-r--r--	2021-01-06 03:41
rdataclass.py	2.81 KB	-rw-r--r--	2020-10-24 23:17
rdataset.py	14.54 KB	-rw-r--r--	2020-10-24 23:17
rdatatype.py	6.64 KB	-rw-r--r--	2020-10-24 23:17
renderer.py	8.59 KB	-rw-r--r--	2020-08-17 01:59
resolver.py	59.29 KB	-rw-r--r--	2020-12-29 03:07
reversename.py	3.65 KB	-rw-r--r--	2020-08-17 01:59
rrset.py	7.44 KB	-rw-r--r--	2020-10-24 23:17
serial.py	3.53 KB	-rw-r--r--	2020-08-17 01:59
set.py	7.64 KB	-rw-r--r--	2020-10-24 23:17
tokenizer.py	21.86 KB	-rw-r--r--	2020-10-24 23:17
transaction.py	16.93 KB	-rw-r--r--	2020-10-24 23:17
tsig.py	10.93 KB	-rw-r--r--	2020-10-30 22:15
tsigkeyring.py	2.43 KB	-rw-r--r--	2020-10-24 23:17
ttl.py	2.58 KB	-rw-r--r--	2020-10-24 23:17
update.py	10.55 KB	-rw-r--r--	2020-10-24 23:17
version.py	1.55 KB	-rw-r--r--	2021-01-07 18:20
versioned.py	15.91 KB	-rw-r--r--	2020-10-24 23:17
wire.py	2.48 KB	-rw-r--r--	2020-10-24 23:17
xfr.py	11.61 KB	-rw-r--r--	2020-10-24 23:17
zone.py	34.25 KB	-rw-r--r--	2020-10-24 23:17
zonefile.py	15.25 KB	-rw-r--r--	2020-10-24 23:17

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.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, v4_origin=ipv4_reverse_domain,
                 v6_origin=ipv6_reverse_domain):
    """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, v4_origin=ipv4_reverse_domain,
               v6_origin=ipv6_reverse_domain):
    """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')