124 lines
2.7 KiB
Python
124 lines
2.7 KiB
Python
# 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 Message Flags."""
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import enum
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from typing import Any
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# Standard DNS flags
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class Flag(enum.IntFlag):
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#: Query Response
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QR = 0x8000
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#: Authoritative Answer
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AA = 0x0400
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#: Truncated Response
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TC = 0x0200
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#: Recursion Desired
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RD = 0x0100
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#: Recursion Available
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RA = 0x0080
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#: Authentic Data
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AD = 0x0020
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#: Checking Disabled
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CD = 0x0010
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# EDNS flags
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class EDNSFlag(enum.IntFlag):
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#: DNSSEC answer OK
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DO = 0x8000
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def _from_text(text: str, enum_class: Any) -> int:
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flags = 0
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tokens = text.split()
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for t in tokens:
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flags |= enum_class[t.upper()]
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return flags
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def _to_text(flags: int, enum_class: Any) -> str:
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text_flags = []
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for k, v in enum_class.__members__.items():
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if flags & v != 0:
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text_flags.append(k)
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return " ".join(text_flags)
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def from_text(text: str) -> int:
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"""Convert a space-separated list of flag text values into a flags
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value.
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Returns an ``int``
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"""
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return _from_text(text, Flag)
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def to_text(flags: int) -> str:
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"""Convert a flags value into a space-separated list of flag text
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values.
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Returns a ``str``.
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"""
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return _to_text(flags, Flag)
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def edns_from_text(text: str) -> int:
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"""Convert a space-separated list of EDNS flag text values into a EDNS
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flags value.
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Returns an ``int``
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"""
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return _from_text(text, EDNSFlag)
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def edns_to_text(flags: int) -> str:
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"""Convert an EDNS flags value into a space-separated list of EDNS flag
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text values.
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Returns a ``str``.
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"""
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return _to_text(flags, EDNSFlag)
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### BEGIN generated Flag constants
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QR = Flag.QR
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AA = Flag.AA
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TC = Flag.TC
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RD = Flag.RD
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RA = Flag.RA
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AD = Flag.AD
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CD = Flag.CD
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### END generated Flag constants
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### BEGIN generated EDNSFlag constants
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DO = EDNSFlag.DO
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### END generated EDNSFlag constants
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