✏️ Editing: HIP.py Read Only

# 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 base64
import binascii
import struct

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 = self._as_tuple(servers, self._as_name)

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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