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Edit File : NAPTR.py \| Size : 4.37 KB
# 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.name import dns.rdata from dns._compat import xrange, text_type def _write_string(file, s): l = len(s) assert l < 256 file.write(struct.pack('!B', l)) file.write(s) def _sanitize(value): if isinstance(value, text_type): return value.encode() return value 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.flags = _sanitize(flags) self.service = _sanitize(service) self.regexp = _sanitize(regexp) self.order = order self.preference = preference 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), replacement) @classmethod 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) 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) @classmethod 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 = wire[current] current += 1 rdlen -= 1 if l > rdlen or rdlen < 0: raise dns.exception.FormError s = wire[current: current + l].unwrap() 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 origin is not None: replacement = replacement.relativize(origin) return cls(rdclass, rdtype, order, preference, strings[0], strings[1], strings[2], replacement) def choose_relativity(self, origin=None, relativize=True): self.replacement = self.replacement.choose_relativity(origin, relativize) Back

Edit File : NAPTR.py | Size : 4.37 KB

# 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.name
import dns.rdata
from dns._compat import xrange, text_type

def _write_string(file, s):
    l = len(s)
    assert l < 256
    file.write(struct.pack('!B', l))
    file.write(s)

def _sanitize(value):
    if isinstance(value, text_type):
        return value.encode()
    return value

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.flags = _sanitize(flags)
        self.service = _sanitize(service)
        self.regexp = _sanitize(regexp)
        self.order = order
        self.preference = preference
        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),
                replacement)

@classmethod
    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)

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)

@classmethod
    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 = wire[current]
            current += 1
            rdlen -= 1
            if l > rdlen or rdlen < 0:
                raise dns.exception.FormError
            s = wire[current: current + l].unwrap()
            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 origin is not None:
            replacement = replacement.relativize(origin)
        return cls(rdclass, rdtype, order, preference, strings[0], strings[1],
                   strings[2], replacement)

def choose_relativity(self, origin=None, relativize=True):
        self.replacement = self.replacement.choose_relativity(origin,
                                                              relativize)

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