mirror of https://github.com/morpheus65535/bazarr
113 lines
2.6 KiB
Python
113 lines
2.6 KiB
Python
|
# Copyright (C) 2001-2007, 2009-2011 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."""
|
||
|
|
|
||
|
|
# Standard DNS flags
|
||
|
|
|
||
|
|
QR = 0x8000
|
||
|
|
AA = 0x0400
|
||
|
|
TC = 0x0200
|
||
|
|
RD = 0x0100
|
||
|
|
RA = 0x0080
|
||
|
|
AD = 0x0020
|
||
|
|
CD = 0x0010
|
||
|
|
|
||
|
|
# EDNS flags
|
||
|
|
|
||
|
|
DO = 0x8000
|
||
|
|
|
||
|
|
_by_text = {
|
||
|
|
'QR': QR,
|
||
|
|
'AA': AA,
|
||
|
|
'TC': TC,
|
||
|
|
'RD': RD,
|
||
|
|
'RA': RA,
|
||
|
|
'AD': AD,
|
||
|
|
'CD': CD
|
||
|
|
}
|
||
|
|
|
||
|
|
_edns_by_text = {
|
||
|
|
'DO': DO
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
# We construct the inverse mappings programmatically to ensure that we
|
||
|
|
# cannot make any mistakes (e.g. omissions, cut-and-paste errors) that
|
||
|
|
# would cause the mappings not to be true inverses.
|
||
|
|
|
||
|
|
_by_value = dict((y, x) for x, y in _by_text.items())
|
||
|
|
|
||
|
|
_edns_by_value = dict((y, x) for x, y in _edns_by_text.items())
|
||
|
|
|
||
|
|
|
||
|
|
def _order_flags(table):
|
||
|
|
order = list(table.items())
|
||
|
|
order.sort()
|
||
|
|
order.reverse()
|
||
|
|
return order
|
||
|
|
|
||
|
|
_flags_order = _order_flags(_by_value)
|
||
|
|
|
||
|
|
_edns_flags_order = _order_flags(_edns_by_value)
|
||
|
|
|
||
|
|
|
||
|
|
def _from_text(text, table):
|
||
|
|
flags = 0
|
||
|
|
tokens = text.split()
|
||
|
|
for t in tokens:
|
||
|
|
flags = flags | table[t.upper()]
|
||
|
|
return flags
|
||
|
|
|
||
|
|
|
||
|
|
def _to_text(flags, table, order):
|
||
|
|
text_flags = []
|
||
|
|
for k, v in order:
|
||
|
|
if flags & k != 0:
|
||
|
|
text_flags.append(v)
|
||
|
|
return ' '.join(text_flags)
|
||
|
|
|
||
|
|
|
||
|
|
def from_text(text):
|
||
|
|
"""Convert a space-separated list of flag text values into a flags
|
||
|
|
value.
|
||
|
|
@rtype: int"""
|
||
|
|
|
||
|
|
return _from_text(text, _by_text)
|
||
|
|
|
||
|
|
|
||
|
|
def to_text(flags):
|
||
|
|
"""Convert a flags value into a space-separated list of flag text
|
||
|
|
values.
|
||
|
|
@rtype: string"""
|
||
|
|
|
||
|
|
return _to_text(flags, _by_value, _flags_order)
|
||
|
|
|
||
|
|
|
||
|
|
def edns_from_text(text):
|
||
|
|
"""Convert a space-separated list of EDNS flag text values into a EDNS
|
||
|
|
flags value.
|
||
|
|
@rtype: int"""
|
||
|
|
|
||
|
|
return _from_text(text, _edns_by_text)
|
||
|
|
|
||
|
|
|
||
|
|
def edns_to_text(flags):
|
||
|
|
"""Convert an EDNS flags value into a space-separated list of EDNS flag
|
||
|
|
text values.
|
||
|
|
@rtype: string"""
|
||
|
|
|
||
|
|
return _to_text(flags, _edns_by_value, _edns_flags_order)
|