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# Copyright (C) 2010, 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 binascii

import dns.rdata
import dns.rdatatype


class DSBase(dns.rdata.Rdata):

    """Base class for rdata that is like a DS record

    @ivar key_tag: the key tag
    @type key_tag: int
    @ivar algorithm: the algorithm
    @type algorithm: int
    @ivar digest_type: the digest type
    @type digest_type: int
    @ivar digest: the digest
    @type digest: int
    @see: draft-ietf-dnsext-delegation-signer-14.txt"""

    __slots__ = ['key_tag', 'algorithm', 'digest_type', 'digest']

    def __init__(self, rdclass, rdtype, key_tag, algorithm, digest_type,
                 digest):
        super(DSBase, self).__init__(rdclass, rdtype)
        self.key_tag = key_tag
        self.algorithm = algorithm
        self.digest_type = digest_type
        self.digest = digest

    def to_text(self, origin=None, relativize=True, **kw):
        return '%d %d %d %s' % (self.key_tag, self.algorithm,
                                self.digest_type,
                                dns.rdata._hexify(self.digest,
                                                  chunksize=128))

    @classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        key_tag = tok.get_uint16()
        algorithm = tok.get_uint8()
        digest_type = tok.get_uint8()
        chunks = []
        while 1:
            t = tok.get().unescape()
            if t.is_eol_or_eof():
                break
            if not t.is_identifier():
                raise dns.exception.SyntaxError
            chunks.append(t.value.encode())
        digest = b''.join(chunks)
        digest = binascii.unhexlify(digest)
        return cls(rdclass, rdtype, key_tag, algorithm, digest_type,
                   digest)

    def to_wire(self, file, compress=None, origin=None):
        header = struct.pack("!HBB", self.key_tag, self.algorithm,
                             self.digest_type)
        file.write(header)
        file.write(self.digest)

    @classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        header = struct.unpack("!HBB", wire[current: current + 4])
        current += 4
        rdlen -= 4
        digest = wire[current: current + rdlen].unwrap()
        return cls(rdclass, rdtype, header[0], header[1], header[2], digest)

Filemanager

Name Type Size Permission Actions
ANY Folder 0755
IN Folder 0755
__pycache__ Folder 0755
__init__.py File 895 B 0644
dnskeybase.py File 4.28 KB 0644
dsbase.py File 3.01 KB 0644
euibase.py File 2.71 KB 0644
mxbase.py File 3.57 KB 0644
nsbase.py File 2.78 KB 0644
txtbase.py File 2.97 KB 0644