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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2026-06-08 18:08
rdtypes	[ DIR ]	drwxr-xr-x	2026-06-08 18:08
LICENSE	1.49 KB	-rw-r--r--	1980-01-01 08:00
__init__.py	1.37 KB	-rw-r--r--	1980-01-01 08:00
_compat.py	1.47 KB	-rw-r--r--	1980-01-01 08:00
dnssec.py	16.12 KB	-rw-r--r--	1980-01-01 08:00
e164.py	3.67 KB	-rw-r--r--	1980-01-01 08:00
edns.py	7.25 KB	-rw-r--r--	1980-01-01 08:00
entropy.py	4.66 KB	-rw-r--r--	1980-01-01 08:00
exception.py	4.76 KB	-rw-r--r--	1980-01-01 08:00
flags.py	2.86 KB	-rw-r--r--	1980-01-01 08:00
grange.py	2.01 KB	-rw-r--r--	1980-01-01 08:00
hash.py	1.29 KB	-rw-r--r--	1980-01-01 08:00
inet.py	3.3 KB	-rw-r--r--	1980-01-01 08:00
ipv4.py	2.05 KB	-rw-r--r--	1980-01-01 08:00
ipv6.py	5.4 KB	-rw-r--r--	1980-01-01 08:00
message.py	40.49 KB	-rw-r--r--	1980-01-01 08:00
name.py	30.53 KB	-rw-r--r--	1980-01-01 08:00
namedict.py	3.87 KB	-rw-r--r--	1980-01-01 08:00
node.py	6.2 KB	-rw-r--r--	1980-01-01 08:00
opcode.py	2.77 KB	-rw-r--r--	1980-01-01 08:00
query.py	23.14 KB	-rw-r--r--	1980-01-01 08:00
rcode.py	3.53 KB	-rw-r--r--	1980-01-01 08:00
rdata.py	14.11 KB	-rw-r--r--	1980-01-01 08:00
rdataclass.py	3.14 KB	-rw-r--r--	1980-01-01 08:00
rdataset.py	11.19 KB	-rw-r--r--	1980-01-01 08:00
rdatatype.py	5.78 KB	-rw-r--r--	1980-01-01 08:00
renderer.py	10.57 KB	-rw-r--r--	1980-01-01 08:00
resolver.py	49.03 KB	-rw-r--r--	1980-01-01 08:00
reversename.py	3.21 KB	-rw-r--r--	1980-01-01 08:00
rrset.py	6.01 KB	-rw-r--r--	1980-01-01 08:00
set.py	7.14 KB	-rw-r--r--	1980-01-01 08:00
tokenizer.py	17.62 KB	-rw-r--r--	1980-01-01 08:00
tsig.py	7.63 KB	-rw-r--r--	1980-01-01 08:00
tsigkeyring.py	1.77 KB	-rw-r--r--	1980-01-01 08:00
ttl.py	2.29 KB	-rw-r--r--	1980-01-01 08:00
update.py	10.1 KB	-rw-r--r--	1980-01-01 08:00
version.py	1.37 KB	-rw-r--r--	1980-01-01 08:00
wiredata.py	3.66 KB	-rw-r--r--	1980-01-01 08:00
zone.py	41.39 KB	-rw-r--r--	1980-01-01 08:00

Rename

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

# Copyright (C) 2001-2017 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 Rdata Classes."""

import re

import dns.exception

RESERVED0 = 0
IN = 1
CH = 3
HS = 4
NONE = 254
ANY = 255

_by_text = {
    'RESERVED0': RESERVED0,
    'IN': IN,
    'CH': CH,
    'HS': HS,
    'NONE': NONE,
    'ANY': ANY
}

# We construct the inverse mapping programmatically to ensure that we
# cannot make any mistakes (e.g. omissions, cut-and-paste errors) that
# would cause the mapping not to be true inverse.

_by_value = {y: x for x, y in _by_text.items()}

# Now that we've built the inverse map, we can add class aliases to
# the _by_text mapping.

_by_text.update({
    'INTERNET': IN,
    'CHAOS': CH,
    'HESIOD': HS
})

_metaclasses = {
    NONE: True,
    ANY: True
}

_unknown_class_pattern = re.compile('CLASS([0-9]+)$', re.I)

class UnknownRdataclass(dns.exception.DNSException):
    """A DNS class is unknown."""

def from_text(text):
    """Convert text into a DNS rdata class value.

The input text can be a defined DNS RR class mnemonic or
    instance of the DNS generic class syntax.

For example, "IN" and "CLASS1" will both result in a value of 1.

Raises ``dns.rdatatype.UnknownRdataclass`` if the class is unknown.

Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535.

Returns an ``int``.
    """

value = _by_text.get(text.upper())
    if value is None:
        match = _unknown_class_pattern.match(text)
        if match is None:
            raise UnknownRdataclass
        value = int(match.group(1))
        if value < 0 or value > 65535:
            raise ValueError("class must be between >= 0 and <= 65535")
    return value

def to_text(value):
    """Convert a DNS rdata type value to text.

If the value has a known mnemonic, it will be used, otherwise the
    DNS generic class syntax will be used.

Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535.

Returns a ``str``.
    """

if value < 0 or value > 65535:
        raise ValueError("class must be between >= 0 and <= 65535")
    text = _by_value.get(value)
    if text is None:
        text = 'CLASS' + repr(value)
    return text

def is_metaclass(rdclass):
    """True if the specified class is a metaclass.

The currently defined metaclasses are ANY and NONE.

*rdclass* is an ``int``.
    """

if rdclass in _metaclasses:
        return True
    return False