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# 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.iteritems()]) _edns_by_value = dict([(y, x) for x, y in _edns_by_text.iteritems()]) def _order_flags(table): order = list(table.iteritems()) 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)