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# 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 Message Flags."""
import enum
# Standard DNS flags
class Flag(enum.IntFlag):
#: Query Response
QR = 0x8000
#: Authoritative Answer
AA = 0x0400
#: Truncated Response
TC = 0x0200
#: Recursion Desired
RD = 0x0100
#: Recursion Available
RA = 0x0080
#: Authentic Data
AD = 0x0020
#: Checking Disabled
CD = 0x0010
globals().update(Flag.__members__)
# EDNS flags
class EDNSFlag(enum.IntFlag):
#: DNSSEC answer OK
DO = 0x8000
globals().update(EDNSFlag.__members__)
def _from_text(text, enum_class):
flags = 0
tokens = text.split()
for t in tokens:
flags |= enum_class[t.upper()]
return flags
def _to_text(flags, enum_class):
text_flags = []
for k, v in enum_class.__members__.items():
if flags & v != 0:
text_flags.append(k)
return ' '.join(text_flags)
def from_text(text):
"""Convert a space-separated list of flag text values into a flags
value.
Returns an ``int``
"""
return _from_text(text, Flag)
def to_text(flags):
"""Convert a flags value into a space-separated list of flag text
values.
Returns a ``str``.
"""
return _to_text(flags, Flag)
def edns_from_text(text):
"""Convert a space-separated list of EDNS flag text values into a EDNS
flags value.
Returns an ``int``
"""
return _from_text(text, EDNSFlag)
def edns_to_text(flags):
"""Convert an EDNS flags value into a space-separated list of EDNS flag
text values.
Returns a ``str``.
"""
return _to_text(flags, EDNSFlag)