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116 lines
2.8 KiB
116 lines
2.8 KiB
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2001-2017 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""DNS Rdata Classes."""
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import dns.enum
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import dns.exception
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class RdataClass(dns.enum.IntEnum):
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"""DNS Rdata Class"""
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RESERVED0 = 0
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IN = 1
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INTERNET = IN
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CH = 3
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CHAOS = CH
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HS = 4
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HESIOD = HS
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NONE = 254
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ANY = 255
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@classmethod
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def _maximum(cls):
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return 65535
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@classmethod
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def _short_name(cls):
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return "class"
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@classmethod
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def _prefix(cls):
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return "CLASS"
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@classmethod
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def _unknown_exception_class(cls):
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return UnknownRdataclass
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_metaclasses = {RdataClass.NONE, RdataClass.ANY}
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class UnknownRdataclass(dns.exception.DNSException):
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"""A DNS class is unknown."""
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def from_text(text):
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"""Convert text into a DNS rdata class value.
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The input text can be a defined DNS RR class mnemonic or
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instance of the DNS generic class syntax.
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For example, "IN" and "CLASS1" will both result in a value of 1.
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Raises ``dns.rdatatype.UnknownRdataclass`` if the class is unknown.
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Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535.
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Returns an ``int``.
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"""
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return RdataClass.from_text(text)
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def to_text(value):
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"""Convert a DNS rdata class value to text.
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If the value has a known mnemonic, it will be used, otherwise the
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DNS generic class syntax will be used.
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Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535.
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Returns a ``str``.
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"""
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return RdataClass.to_text(value)
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def is_metaclass(rdclass):
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"""True if the specified class is a metaclass.
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The currently defined metaclasses are ANY and NONE.
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*rdclass* is an ``int``.
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"""
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if rdclass in _metaclasses:
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return True
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return False
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### BEGIN generated RdataClass constants
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RESERVED0 = RdataClass.RESERVED0
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IN = RdataClass.IN
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INTERNET = RdataClass.INTERNET
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CH = RdataClass.CH
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CHAOS = RdataClass.CHAOS
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HS = RdataClass.HS
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HESIOD = RdataClass.HESIOD
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NONE = RdataClass.NONE
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ANY = RdataClass.ANY
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### END generated RdataClass constants
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