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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 Rdata Types. @var _by_text: The rdata type textual name to value mapping @type _by_text: dict @var _by_value: The rdata type value to textual name mapping @type _by_value: dict @var _metatypes: If an rdatatype is a metatype, there will be a mapping whose key is the rdatatype value and whose value is True in this dictionary. @type _metatypes: dict @var _singletons: If an rdatatype is a singleton, there will be a mapping whose key is the rdatatype value and whose value is True in this dictionary. @type _singletons: dict""" import re import dns.exception NONE = 0 A = 1 NS = 2 MD = 3 MF = 4 CNAME = 5 SOA = 6 MB = 7 MG = 8 MR = 9 NULL = 10 WKS = 11 PTR = 12 HINFO = 13 MINFO = 14 MX = 15 TXT = 16 RP = 17 AFSDB = 18 X25 = 19 ISDN = 20 RT = 21 NSAP = 22 NSAP_PTR = 23 SIG = 24 KEY = 25 PX = 26 GPOS = 27 AAAA = 28 LOC = 29 NXT = 30 SRV = 33 NAPTR = 35 KX = 36 CERT = 37 A6 = 38 DNAME = 39 OPT = 41 APL = 42 DS = 43 SSHFP = 44 IPSECKEY = 45 RRSIG = 46 NSEC = 47 DNSKEY = 48 DHCID = 49 NSEC3 = 50 NSEC3PARAM = 51 TLSA = 52 HIP = 55 SPF = 99 UNSPEC = 103 TKEY = 249 TSIG = 250 IXFR = 251 AXFR = 252 MAILB = 253 MAILA = 254 ANY = 255 TA = 32768 DLV = 32769 _by_text = { 'NONE' : NONE, 'A' : A, 'NS' : NS, 'MD' : MD, 'MF' : MF, 'CNAME' : CNAME, 'SOA' : SOA, 'MB' : MB, 'MG' : MG, 'MR' : MR, 'NULL' : NULL, 'WKS' : WKS, 'PTR' : PTR, 'HINFO' : HINFO, 'MINFO' : MINFO, 'MX' : MX, 'TXT' : TXT, 'RP' : RP, 'AFSDB' : AFSDB, 'X25' : X25, 'ISDN' : ISDN, 'RT' : RT, 'NSAP' : NSAP, 'NSAP-PTR' : NSAP_PTR, 'SIG' : SIG, 'KEY' : KEY, 'PX' : PX, 'GPOS' : GPOS, 'AAAA' : AAAA, 'LOC' : LOC, 'NXT' : NXT, 'SRV' : SRV, 'NAPTR' : NAPTR, 'KX' : KX, 'CERT' : CERT, 'A6' : A6, 'DNAME' : DNAME, 'OPT' : OPT, 'APL' : APL, 'DS' : DS, 'SSHFP' : SSHFP, 'IPSECKEY' : IPSECKEY, 'RRSIG' : RRSIG, 'NSEC' : NSEC, 'DNSKEY' : DNSKEY, 'DHCID' : DHCID, 'NSEC3' : NSEC3, 'NSEC3PARAM' : NSEC3PARAM, 'TLSA' : TLSA, 'HIP' : HIP, 'SPF' : SPF, 'UNSPEC' : UNSPEC, 'TKEY' : TKEY, 'TSIG' : TSIG, 'IXFR' : IXFR, 'AXFR' : AXFR, 'MAILB' : MAILB, 'MAILA' : MAILA, 'ANY' : ANY, 'TA' : TA, 'DLV' : DLV, } # 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()]) _metatypes = { OPT : True } _singletons = { SOA : True, NXT : True, DNAME : True, NSEC : True, # CNAME is technically a singleton, but we allow multiple CNAMEs. } _unknown_type_pattern = re.compile('TYPE([0-9]+)$', re.I); class UnknownRdatatype(dns.exception.DNSException): """Raised if a type is unknown.""" pass def from_text(text): """Convert text into a DNS rdata type value. @param text: the text @type text: string @raises dns.rdatatype.UnknownRdatatype: the type is unknown @raises ValueError: the rdata type value is not >= 0 and <= 65535 @rtype: int""" value = _by_text.get(text.upper()) if value is None: match = _unknown_type_pattern.match(text) if match == None: raise UnknownRdatatype value = int(match.group(1)) if value < 0 or value > 65535: raise ValueError("type must be between >= 0 and <= 65535") return value def to_text(value): """Convert a DNS rdata type to text. @param value: the rdata type value @type value: int @raises ValueError: the rdata type value is not >= 0 and <= 65535 @rtype: string""" if value < 0 or value > 65535: raise ValueError("type must be between >= 0 and <= 65535") text = _by_value.get(value) if text is None: text = 'TYPE' + `value` return text def is_metatype(rdtype): """True if the type is a metatype. @param rdtype: the type @type rdtype: int @rtype: bool""" if rdtype >= TKEY and rdtype <= ANY or _metatypes.has_key(rdtype): return True return False def is_singleton(rdtype): """True if the type is a singleton. @param rdtype: the type @type rdtype: int @rtype: bool""" if _singletons.has_key(rdtype): return True return False