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?? AFSDB.py(1.8 KB)
?? AVC.py(950 B)
?? CAA.py(2.56 KB)
?? CDNSKEY.py(1 KB)
?? CDS.py(875 B)
?? CERT.py(3.86 KB)
?? CNAME.py(1.06 KB)
?? CSYNC.py(4.54 KB)
?? DLV.py(864 B)
?? DNAME.py(979 B)
?? DNSKEY.py(1 KB)
?? DS.py(873 B)
?? EUI48.py(1.1 KB)
?? EUI64.py(1.11 KB)
?? GPOS.py(5.24 KB)
?? HINFO.py(2.6 KB)
?? HIP.py(4.05 KB)
?? ISDN.py(3.19 KB)
?? LOC.py(11.98 KB)
?? MX.py(873 B)
?? NS.py(873 B)
?? NSEC.py(4.58 KB)
?? NSEC3.py(6.91 KB)
?? NSEC3PARAM.py(3.03 KB)
?? PTR.py(875 B)
?? RP.py(3 KB)
?? RRSIG.py(5.53 KB)
?? RT.py(891 B)
?? SOA.py(4.41 KB)
?? SPF.py(899 B)
?? SSHFP.py(2.76 KB)
?? TLSA.py(2.89 KB)
?? TXT.py(878 B)
?? URI.py(2.83 KB)
?? X25.py(2.07 KB)
?? __init__.py(1.19 KB)
?? __pycache__

Editing: CERT.py

# 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 base64

import dns.exception
import dns.dnssec
import dns.rdata
import dns.tokenizer

_ctype_by_value = {
    1: 'PKIX',
    2: 'SPKI',
    3: 'PGP',
    253: 'URI',
    254: 'OID',
}

_ctype_by_name = {
    'PKIX': 1,
    'SPKI': 2,
    'PGP': 3,
    'URI': 253,
    'OID': 254,
}

def _ctype_from_text(what):
    v = _ctype_by_name.get(what)
    if v is not None:
        return v
    return int(what)

def _ctype_to_text(what):
    v = _ctype_by_value.get(what)
    if v is not None:
        return v
    return str(what)

class CERT(dns.rdata.Rdata):

"""CERT record

@ivar certificate_type: certificate type
    @type certificate_type: int
    @ivar key_tag: key tag
    @type key_tag: int
    @ivar algorithm: algorithm
    @type algorithm: int
    @ivar certificate: the certificate or CRL
    @type certificate: string
    @see: RFC 2538"""

__slots__ = ['certificate_type', 'key_tag', 'algorithm', 'certificate']

def __init__(self, rdclass, rdtype, certificate_type, key_tag, algorithm,
                 certificate):
        super(CERT, self).__init__(rdclass, rdtype)
        self.certificate_type = certificate_type
        self.key_tag = key_tag
        self.algorithm = algorithm
        self.certificate = certificate

def to_text(self, origin=None, relativize=True, **kw):
        certificate_type = _ctype_to_text(self.certificate_type)
        return "%s %d %s %s" % (certificate_type, self.key_tag,
                                dns.dnssec.algorithm_to_text(self.algorithm),
                                dns.rdata._base64ify(self.certificate))

@classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        certificate_type = _ctype_from_text(tok.get_string())
        key_tag = tok.get_uint16()
        algorithm = dns.dnssec.algorithm_from_text(tok.get_string())
        if algorithm < 0 or algorithm > 255:
            raise dns.exception.SyntaxError("bad algorithm type")
        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())
        b64 = b''.join(chunks)
        certificate = base64.b64decode(b64)
        return cls(rdclass, rdtype, certificate_type, key_tag,
                   algorithm, certificate)

def to_wire(self, file, compress=None, origin=None):
        prefix = struct.pack("!HHB", self.certificate_type, self.key_tag,
                             self.algorithm)
        file.write(prefix)
        file.write(self.certificate)

@classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        prefix = wire[current: current + 5].unwrap()
        current += 5
        rdlen -= 5
        if rdlen < 0:
            raise dns.exception.FormError
        (certificate_type, key_tag, algorithm) = struct.unpack("!HHB", prefix)
        certificate = wire[current: current + rdlen].unwrap()
        return cls(rdclass, rdtype, certificate_type, key_tag, algorithm,
                   certificate)

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