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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
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,
'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
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