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# Copyright (C) 2003-2007, 2009, 2010 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.
import dns.exception
import dns.rdata
import dns.rdatatype
import dns.name
class NXT(dns.rdata.Rdata):
"""NXT record
@ivar next: the next name
@type next: dns.name.Name object
@ivar bitmap: the type bitmap
@type bitmap: string
@see: RFC 2535"""
__slots__ = ['next', 'bitmap']
def __init__(self, rdclass, rdtype, next, bitmap):
super(NXT, self).__init__(rdclass, rdtype)
self.next = next
self.bitmap = bitmap
def to_text(self, origin=None, relativize=True, **kw):
next = self.next.choose_relativity(origin, relativize)
bits = []
for i in xrange(0, len(self.bitmap)):
byte = ord(self.bitmap[i])
for j in xrange(0, 8):
if byte & (0x80 >> j):
bits.append(dns.rdatatype.to_text(i * 8 + j))
text = ' '.join(bits)
return '%s %s' % (next, text)
def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
next = tok.get_name()
next = next.choose_relativity(origin, relativize)
bitmap = ['\x00', '\x00', '\x00', '\x00',
'\x00', '\x00', '\x00', '\x00',
'\x00', '\x00', '\x00', '\x00',
'\x00', '\x00', '\x00', '\x00' ]
while 1:
token = tok.get().unescape()
if token.is_eol_or_eof():
break
if token.value.isdigit():
nrdtype = int(token.value)
else:
nrdtype = dns.rdatatype.from_text(token.value)
if nrdtype == 0:
raise dns.exception.SyntaxError("NXT with bit 0")
if nrdtype > 127:
raise dns.exception.SyntaxError("NXT with bit > 127")
i = nrdtype // 8
bitmap[i] = chr(ord(bitmap[i]) | (0x80 >> (nrdtype % 8)))
bitmap = dns.rdata._truncate_bitmap(bitmap)
return cls(rdclass, rdtype, next, bitmap)
from_text = classmethod(from_text)
def to_wire(self, file, compress = None, origin = None):
self.next.to_wire(file, None, origin)
file.write(self.bitmap)
def to_digestable(self, origin = None):
return self.next.to_digestable(origin) + self.bitmap
def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
(next, cused) = dns.name.from_wire(wire[: current + rdlen], current)
current += cused
rdlen -= cused
bitmap = wire[current : current + rdlen]
if not origin is None:
next = next.relativize(origin)
return cls(rdclass, rdtype, next, bitmap)
from_wire = classmethod(from_wire)
def choose_relativity(self, origin = None, relativize = True):
self.next = self.next.choose_relativity(origin, relativize)
def _cmp(self, other):
v = cmp(self.next, other.next)
if v == 0:
v = cmp(self.bitmap, other.bitmap)
return v
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