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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 Opcodes.""" import dns.exception QUERY = 0 IQUERY = 1 STATUS = 2 NOTIFY = 4 UPDATE = 5 _by_text = { 'QUERY' : QUERY, 'IQUERY' : IQUERY, 'STATUS' : STATUS, 'NOTIFY' : NOTIFY, 'UPDATE' : UPDATE } # We construct the inverse mapping programmatically to ensure that we # cannot make any mistakes (e.g. omissions, cut-and-paste errors) that # would cause the mapping not to be true inverse. _by_value = dict([(y, x) for x, y in _by_text.iteritems()]) class UnknownOpcode(dns.exception.DNSException): """Raised if an opcode is unknown.""" pass def from_text(text): """Convert text into an opcode. @param text: the textual opcode @type text: string @raises UnknownOpcode: the opcode is unknown @rtype: int """ if text.isdigit(): value = int(text) if value >= 0 and value <= 15: return value value = _by_text.get(text.upper()) if value is None: raise UnknownOpcode return value def from_flags(flags): """Extract an opcode from DNS message flags. @param flags: int @rtype: int """ return (flags & 0x7800) >> 11 def to_flags(value): """Convert an opcode to a value suitable for ORing into DNS message flags. @rtype: int """ return (value << 11) & 0x7800 def to_text(value): """Convert an opcode to text. @param value: the opcdoe @type value: int @raises UnknownOpcode: the opcode is unknown @rtype: string """ text = _by_value.get(value) if text is None: text = str(value) return text def is_update(flags): """True if the opcode in flags is UPDATE. @param flags: DNS flags @type flags: int @rtype: bool """ if (from_flags(flags) == UPDATE): return True return False