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Edit File : CAA.py \| Size : 2.56 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.rdata import dns.tokenizer class CAA(dns.rdata.Rdata): """CAA (Certification Authority Authorization) record @ivar flags: the flags @type flags: int @ivar tag: the tag @type tag: string @ivar value: the value @type value: string @see: RFC 6844""" __slots__ = ['flags', 'tag', 'value'] def __init__(self, rdclass, rdtype, flags, tag, value): super(CAA, self).__init__(rdclass, rdtype) self.flags = flags self.tag = tag self.value = value def to_text(self, origin=None, relativize=True, **kw): return '%u %s "%s"' % (self.flags, dns.rdata._escapify(self.tag), dns.rdata._escapify(self.value)) @classmethod def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): flags = tok.get_uint8() tag = tok.get_string().encode() if len(tag) > 255: raise dns.exception.SyntaxError("tag too long") if not tag.isalnum(): raise dns.exception.SyntaxError("tag is not alphanumeric") value = tok.get_string().encode() return cls(rdclass, rdtype, flags, tag, value) def to_wire(self, file, compress=None, origin=None): file.write(struct.pack('!B', self.flags)) l = len(self.tag) assert l < 256 file.write(struct.pack('!B', l)) file.write(self.tag) file.write(self.value) @classmethod def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): (flags, l) = struct.unpack('!BB', wire[current: current + 2]) current += 2 tag = wire[current: current + l] value = wire[current + l:current + rdlen - 2] return cls(rdclass, rdtype, flags, tag, value) Back

Edit File : CAA.py | Size : 2.56 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.rdata
import dns.tokenizer

class CAA(dns.rdata.Rdata):

"""CAA (Certification Authority Authorization) record

@ivar flags: the flags
    @type flags: int
    @ivar tag: the tag
    @type tag: string
    @ivar value: the value
    @type value: string
    @see: RFC 6844"""

__slots__ = ['flags', 'tag', 'value']

def __init__(self, rdclass, rdtype, flags, tag, value):
        super(CAA, self).__init__(rdclass, rdtype)
        self.flags = flags
        self.tag = tag
        self.value = value

def to_text(self, origin=None, relativize=True, **kw):
        return '%u %s "%s"' % (self.flags,
                               dns.rdata._escapify(self.tag),
                               dns.rdata._escapify(self.value))

@classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        flags = tok.get_uint8()
        tag = tok.get_string().encode()
        if len(tag) > 255:
            raise dns.exception.SyntaxError("tag too long")
        if not tag.isalnum():
            raise dns.exception.SyntaxError("tag is not alphanumeric")
        value = tok.get_string().encode()
        return cls(rdclass, rdtype, flags, tag, value)

def to_wire(self, file, compress=None, origin=None):
        file.write(struct.pack('!B', self.flags))
        l = len(self.tag)
        assert l < 256
        file.write(struct.pack('!B', l))
        file.write(self.tag)
        file.write(self.value)

@classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        (flags, l) = struct.unpack('!BB', wire[current: current + 2])
        current += 2
        tag = wire[current: current + l]
        value = wire[current + l:current + rdlen - 2]
        return cls(rdclass, rdtype, flags, tag, value)

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