Current File : //usr/lib/python3/dist-packages/dns/rdataclass.py
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2001-2017 Nominum, Inc.
#
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# provided that the above copyright notice and this permission notice
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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"""DNS Rdata Classes."""
import dns.enum
import dns.exception
class RdataClass(dns.enum.IntEnum):
"""DNS Rdata Class"""
RESERVED0 = 0
IN = 1
INTERNET = IN
CH = 3
CHAOS = CH
HS = 4
HESIOD = HS
NONE = 254
ANY = 255
@classmethod
def _maximum(cls):
return 65535
@classmethod
def _short_name(cls):
return "class"
@classmethod
def _prefix(cls):
return "CLASS"
@classmethod
def _unknown_exception_class(cls):
return UnknownRdataclass
_metaclasses = {RdataClass.NONE, RdataClass.ANY}
class UnknownRdataclass(dns.exception.DNSException):
"""A DNS class is unknown."""
def from_text(text: str) -> RdataClass:
"""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 a ``dns.rdataclass.RdataClass``.
"""
return RdataClass.from_text(text)
def to_text(value: RdataClass) -> str:
"""Convert a DNS rdata class 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``.
"""
return RdataClass.to_text(value)
def is_metaclass(rdclass: RdataClass) -> bool:
"""True if the specified class is a metaclass.
The currently defined metaclasses are ANY and NONE.
*rdclass* is a ``dns.rdataclass.RdataClass``.
"""
if rdclass in _metaclasses:
return True
return False
### BEGIN generated RdataClass constants
RESERVED0 = RdataClass.RESERVED0
IN = RdataClass.IN
INTERNET = RdataClass.INTERNET
CH = RdataClass.CH
CHAOS = RdataClass.CHAOS
HS = RdataClass.HS
HESIOD = RdataClass.HESIOD
NONE = RdataClass.NONE
ANY = RdataClass.ANY
### END generated RdataClass constants
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