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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2003-2007, 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.
import struct
import dns.exception
import dns.immutable
import dns.name
import dns.rdata
import dns.rdtypes.util
def _write_string(file, s):
l = len(s)
assert l < 256
file.write(struct.pack("!B", l))
file.write(s)
@dns.immutable.immutable
class NAPTR(dns.rdata.Rdata):
"""NAPTR record"""
# see: RFC 3403
__slots__ = ["order", "preference", "flags", "service", "regexp", "replacement"]
def __init__(
self, rdclass, rdtype, order, preference, flags, service, regexp, replacement
):
super().__init__(rdclass, rdtype)
self.flags = self._as_bytes(flags, True, 255)
self.service = self._as_bytes(service, True, 255)
self.regexp = self._as_bytes(regexp, True, 255)
self.order = self._as_uint16(order)
self.preference = self._as_uint16(preference)
self.replacement = self._as_name(replacement)
def to_text(self, origin=None, relativize=True, **kw):
replacement = self.replacement.choose_relativity(origin, relativize)
return (
f"{self.order} {self.preference} "
f'"{dns.rdata._escapify(self.flags)}" '
f'"{dns.rdata._escapify(self.service)}" '
f'"{dns.rdata._escapify(self.regexp)}" '
f"{replacement}"
)
@classmethod
def from_text(
cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
):
order = tok.get_uint16()
preference = tok.get_uint16()
flags = tok.get_string()
service = tok.get_string()
regexp = tok.get_string()
replacement = tok.get_name(origin, relativize, relativize_to)
return cls(
rdclass, rdtype, order, preference, flags, service, regexp, replacement
)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
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, canonicalize)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
(order, preference) = parser.get_struct("!HH")
strings = []
for _ in range(3):
s = parser.get_counted_bytes()
strings.append(s)
replacement = parser.get_name(origin)
return cls(
rdclass,
rdtype,
order,
preference,
strings[0],
strings[1],
strings[2],
replacement,
)
def _processing_priority(self):
return (self.order, self.preference)
@classmethod
def _processing_order(cls, iterable):
return dns.rdtypes.util.priority_processing_order(iterable)
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