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Edit File : HIP.py \| Size : 4.05 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 base64 import binascii import dns.exception import dns.rdata import dns.rdatatype class HIP(dns.rdata.Rdata): """HIP record @ivar hit: the host identity tag @type hit: string @ivar algorithm: the public key cryptographic algorithm @type algorithm: int @ivar key: the public key @type key: string @ivar servers: the rendezvous servers @type servers: list of dns.name.Name objects @see: RFC 5205""" __slots__ = ['hit', 'algorithm', 'key', 'servers'] def __init__(self, rdclass, rdtype, hit, algorithm, key, servers): super(HIP, self).__init__(rdclass, rdtype) self.hit = hit self.algorithm = algorithm self.key = key self.servers = 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 = u'' servers = [] for server in self.servers: servers.append(server.choose_relativity(origin, relativize)) if len(servers) > 0: text += (u' ' + u' '.join((x.to_unicode() for x in servers))) return u'%u %s %s%s' % (self.algorithm, hit, key, text) @classmethod def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): algorithm = tok.get_uint8() hit = binascii.unhexlify(tok.get_string().encode()) if len(hit) > 255: raise dns.exception.SyntaxError("HIT too long") key = base64.b64decode(tok.get_string().encode()) servers = [] while 1: token = tok.get() if token.is_eol_or_eof(): break server = dns.name.from_text(token.value, origin) server.choose_relativity(origin, relativize) servers.append(server) return cls(rdclass, rdtype, hit, algorithm, key, servers) def to_wire(self, file, compress=None, origin=None): 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) @classmethod def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): (lh, algorithm, lk) = struct.unpack('!BBH', wire[current: current + 4]) current += 4 rdlen -= 4 hit = wire[current: current + lh].unwrap() current += lh rdlen -= lh key = wire[current: current + lk].unwrap() current += lk rdlen -= lk servers = [] while rdlen > 0: (server, cused) = dns.name.from_wire(wire[: current + rdlen], current) current += cused rdlen -= cused if origin is not None: server = server.relativize(origin) servers.append(server) return cls(rdclass, rdtype, hit, algorithm, key, servers) def choose_relativity(self, origin=None, relativize=True): servers = [] for server in self.servers: server = server.choose_relativity(origin, relativize) servers.append(server) self.servers = servers Back

Edit File : HIP.py | Size : 4.05 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 base64
import binascii

import dns.exception
import dns.rdata
import dns.rdatatype

class HIP(dns.rdata.Rdata):

"""HIP record

@ivar hit: the host identity tag
    @type hit: string
    @ivar algorithm: the public key cryptographic algorithm
    @type algorithm: int
    @ivar key: the public key
    @type key: string
    @ivar servers: the rendezvous servers
    @type servers: list of dns.name.Name objects
    @see: RFC 5205"""

__slots__ = ['hit', 'algorithm', 'key', 'servers']

def __init__(self, rdclass, rdtype, hit, algorithm, key, servers):
        super(HIP, self).__init__(rdclass, rdtype)
        self.hit = hit
        self.algorithm = algorithm
        self.key = key
        self.servers = 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 = u''
        servers = []
        for server in self.servers:
            servers.append(server.choose_relativity(origin, relativize))
        if len(servers) > 0:
            text += (u' ' + u' '.join((x.to_unicode() for x in servers)))
        return u'%u %s %s%s' % (self.algorithm, hit, key, text)

@classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        algorithm = tok.get_uint8()
        hit = binascii.unhexlify(tok.get_string().encode())
        if len(hit) > 255:
            raise dns.exception.SyntaxError("HIT too long")
        key = base64.b64decode(tok.get_string().encode())
        servers = []
        while 1:
            token = tok.get()
            if token.is_eol_or_eof():
                break
            server = dns.name.from_text(token.value, origin)
            server.choose_relativity(origin, relativize)
            servers.append(server)
        return cls(rdclass, rdtype, hit, algorithm, key, servers)

def to_wire(self, file, compress=None, origin=None):
        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)

@classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        (lh, algorithm, lk) = struct.unpack('!BBH',
                                            wire[current: current + 4])
        current += 4
        rdlen -= 4
        hit = wire[current: current + lh].unwrap()
        current += lh
        rdlen -= lh
        key = wire[current: current + lk].unwrap()
        current += lk
        rdlen -= lk
        servers = []
        while rdlen > 0:
            (server, cused) = dns.name.from_wire(wire[: current + rdlen],
                                                 current)
            current += cused
            rdlen -= cused
            if origin is not None:
                server = server.relativize(origin)
            servers.append(server)
        return cls(rdclass, rdtype, hit, algorithm, key, servers)

def choose_relativity(self, origin=None, relativize=True):
        servers = []
        for server in self.servers:
            server = server.choose_relativity(origin, relativize)
            servers.append(server)
        self.servers = servers

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