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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# 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 base64
import binascii
import dns.exception
import dns.immutable
import dns.rdata
import dns.rdatatype
@dns.immutable.immutable
class HIP(dns.rdata.Rdata):
"""HIP record"""
# see: RFC 5205
__slots__ = ['hit', 'algorithm', 'key', 'servers']
def __init__(self, rdclass, rdtype, hit, algorithm, key, servers):
super().__init__(rdclass, rdtype)
self.hit = self._as_bytes(hit, True, 255)
self.algorithm = self._as_uint8(algorithm)
self.key = self._as_bytes(key, True)
self.servers = tuple([self._as_name(s) for s in servers])
def to_text(self, origin=None, relativize=True, **kw):
hit = binascii.hexlify(self.hit).decode()
key = base64.b64encode(self.key).replace(b'\n', b'').decode()
text = ''
servers = []
for server in self.servers:
servers.append(server.choose_relativity(origin, relativize))
if len(servers) > 0:
text += (' ' + ' '.join((x.to_unicode() for x in servers)))
return '%u %s %s%s' % (self.algorithm, hit, key, text)
@classmethod
def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
relativize_to=None):
algorithm = tok.get_uint8()
hit = binascii.unhexlify(tok.get_string().encode())
key = base64.b64decode(tok.get_string().encode())
servers = []
for token in tok.get_remaining():
server = tok.as_name(token, origin, relativize, relativize_to)
servers.append(server)
return cls(rdclass, rdtype, hit, algorithm, key, servers)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
lh = len(self.hit)
lk = len(self.key)
file.write(struct.pack("!BBH", lh, self.algorithm, lk))
file.write(self.hit)
file.write(self.key)
for server in self.servers:
server.to_wire(file, None, origin, False)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
(lh, algorithm, lk) = parser.get_struct('!BBH')
hit = parser.get_bytes(lh)
key = parser.get_bytes(lk)
servers = []
while parser.remaining() > 0:
server = parser.get_name(origin)
servers.append(server)
return cls(rdclass, rdtype, hit, algorithm, key, servers)
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