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Edit File : dsbase.py \| Size : 3.01 KB
# 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) Back

Edit File : dsbase.py | Size : 3.01 KB

# 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)

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