| # 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 |