""" Multicast DNS Service Discovery for Python, v0.14-wmcbrine

Copyright 2003 Paul Scott-Murphy, 2014 William McBrine

This module provides a framework for the use of DNS Service Discovery

using IP multicast.

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301

USA

"""

from ..const import (

_FLAGS_QR_MASK,

_FLAGS_QR_QUERY,

_FLAGS_QR_RESPONSE,

_FLAGS_TC,

)

class DNSMessage:

"""A base class for DNS messages."""

__slots__ = ('flags',)

def __init__(self, flags: int) -> None:

"""Construct a DNS message."""

self.flags = flags

def is_query(self) -> bool:

"""Returns true if this is a query."""

return (self.flags & _FLAGS_QR_MASK) == _FLAGS_QR_QUERY

def is_response(self) -> bool:

"""Returns true if this is a response."""

return (self.flags & _FLAGS_QR_MASK) == _FLAGS_QR_RESPONSE

@property

def truncated(self) -> bool:

"""Returns true if this is a truncated."""

return (self.flags & _FLAGS_TC) == _FLAGS_TC