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dns
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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 Result Codes.""" import dns.exception NOERROR = 0 FORMERR = 1 SERVFAIL = 2 NXDOMAIN = 3 NOTIMP = 4 REFUSED = 5 YXDOMAIN = 6 YXRRSET = 7 NXRRSET = 8 NOTAUTH = 9 NOTZONE = 10 BADVERS = 16 _by_text = { 'NOERROR' : NOERROR, 'FORMERR' : FORMERR, 'SERVFAIL' : SERVFAIL, 'NXDOMAIN' : NXDOMAIN, 'NOTIMP' : NOTIMP, 'REFUSED' : REFUSED, 'YXDOMAIN' : YXDOMAIN, 'YXRRSET' : YXRRSET, 'NXRRSET' : NXRRSET, 'NOTAUTH' : NOTAUTH, 'NOTZONE' : NOTZONE, 'BADVERS' : BADVERS } # 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 a true inverse. _by_value = dict([(y, x) for x, y in _by_text.iteritems()]) class UnknownRcode(dns.exception.DNSException): """Raised if an rcode is unknown.""" pass def from_text(text): """Convert text into an rcode. @param text: the texual rcode @type text: string @raises UnknownRcode: the rcode is unknown @rtype: int """ if text.isdigit(): v = int(text) if v >= 0 and v <= 4095: return v v = _by_text.get(text.upper()) if v is None: raise UnknownRcode return v def from_flags(flags, ednsflags): """Return the rcode value encoded by flags and ednsflags. @param flags: the DNS flags @type flags: int @param ednsflags: the EDNS flags @type ednsflags: int @raises ValueError: rcode is < 0 or > 4095 @rtype: int """ value = (flags & 0x000f) | ((ednsflags >> 20) & 0xff0) if value < 0 or value > 4095: raise ValueError('rcode must be >= 0 and <= 4095') return value def to_flags(value): """Return a (flags, ednsflags) tuple which encodes the rcode. @param value: the rcode @type value: int @raises ValueError: rcode is < 0 or > 4095 @rtype: (int, int) tuple """ if value < 0 or value > 4095: raise ValueError('rcode must be >= 0 and <= 4095') v = value & 0xf ev = long(value & 0xff0) << 20 return (v, ev) def to_text(value): """Convert rcode into text. @param value: the rcode @type value: int @rtype: string """ text = _by_value.get(value) if text is None: text = str(value) return text
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