| # 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 struct |
| |
| import dns.exception |
| import dns.name |
| import dns.rdata |
| |
| def _write_string(file, s): |
| l = len(s) |
| assert l < 256 |
| byte = chr(l) |
| file.write(byte) |
| file.write(s) |
| |
| class NAPTR(dns.rdata.Rdata): |
| """NAPTR record |
| |
| @ivar order: order |
| @type order: int |
| @ivar preference: preference |
| @type preference: int |
| @ivar flags: flags |
| @type flags: string |
| @ivar service: service |
| @type service: string |
| @ivar regexp: regular expression |
| @type regexp: string |
| @ivar replacement: replacement name |
| @type replacement: dns.name.Name object |
| @see: RFC 3403""" |
| |
| __slots__ = ['order', 'preference', 'flags', 'service', 'regexp', |
| 'replacement'] |
| |
| def __init__(self, rdclass, rdtype, order, preference, flags, service, |
| regexp, replacement): |
| super(NAPTR, self).__init__(rdclass, rdtype) |
| self.order = order |
| self.preference = preference |
| self.flags = flags |
| self.service = service |
| self.regexp = regexp |
| self.replacement = replacement |
| |
| def to_text(self, origin=None, relativize=True, **kw): |
| replacement = self.replacement.choose_relativity(origin, relativize) |
| return '%d %d "%s" "%s" "%s" %s' % \ |
| (self.order, self.preference, |
| dns.rdata._escapify(self.flags), |
| dns.rdata._escapify(self.service), |
| dns.rdata._escapify(self.regexp), |
| self.replacement) |
| |
| def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): |
| order = tok.get_uint16() |
| preference = tok.get_uint16() |
| flags = tok.get_string() |
| service = tok.get_string() |
| regexp = tok.get_string() |
| replacement = tok.get_name() |
| replacement = replacement.choose_relativity(origin, relativize) |
| tok.get_eol() |
| return cls(rdclass, rdtype, order, preference, flags, service, |
| regexp, replacement) |
| |
| from_text = classmethod(from_text) |
| |
| def to_wire(self, file, compress = None, origin = None): |
| two_ints = struct.pack("!HH", self.order, self.preference) |
| file.write(two_ints) |
| _write_string(file, self.flags) |
| _write_string(file, self.service) |
| _write_string(file, self.regexp) |
| self.replacement.to_wire(file, compress, origin) |
| |
| def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): |
| (order, preference) = struct.unpack('!HH', wire[current : current + 4]) |
| current += 4 |
| rdlen -= 4 |
| strings = [] |
| for i in xrange(3): |
| l = ord(wire[current]) |
| current += 1 |
| rdlen -= 1 |
| if l > rdlen or rdlen < 0: |
| raise dns.exception.FormError |
| s = wire[current : current + l] |
| current += l |
| rdlen -= l |
| strings.append(s) |
| (replacement, cused) = dns.name.from_wire(wire[: current + rdlen], |
| current) |
| if cused != rdlen: |
| raise dns.exception.FormError |
| if not origin is None: |
| replacement = replacement.relativize(origin) |
| return cls(rdclass, rdtype, order, preference, strings[0], strings[1], |
| strings[2], replacement) |
| |
| from_wire = classmethod(from_wire) |
| |
| def choose_relativity(self, origin = None, relativize = True): |
| self.replacement = self.replacement.choose_relativity(origin, |
| relativize) |
| |
| def _cmp(self, other): |
| sp = struct.pack("!HH", self.order, self.preference) |
| op = struct.pack("!HH", other.order, other.preference) |
| v = cmp(sp, op) |
| if v == 0: |
| v = cmp(self.flags, other.flags) |
| if v == 0: |
| v = cmp(self.service, other.service) |
| if v == 0: |
| v = cmp(self.regexp, other.regexp) |
| if v == 0: |
| v = cmp(self.replacement, other.replacement) |
| return v |
