mirror of https://github.com/morpheus65535/bazarr
114 lines
4.0 KiB
Python
114 lines
4.0 KiB
Python
# Copyright (C) 2010, 2011 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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import struct
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import base64
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import binascii
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import dns.exception
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import dns.rdata
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import dns.rdatatype
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class HIP(dns.rdata.Rdata):
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"""HIP record
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@ivar hit: the host identity tag
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@type hit: string
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@ivar algorithm: the public key cryptographic algorithm
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@type algorithm: int
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@ivar key: the public key
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@type key: string
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@ivar servers: the rendezvous servers
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@type servers: list of dns.name.Name objects
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@see: RFC 5205"""
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__slots__ = ['hit', 'algorithm', 'key', 'servers']
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def __init__(self, rdclass, rdtype, hit, algorithm, key, servers):
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super(HIP, self).__init__(rdclass, rdtype)
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self.hit = hit
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self.algorithm = algorithm
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self.key = key
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self.servers = servers
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def to_text(self, origin=None, relativize=True, **kw):
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hit = binascii.hexlify(self.hit).decode()
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key = base64.b64encode(self.key).replace(b'\n', b'').decode()
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text = u''
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servers = []
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for server in self.servers:
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servers.append(server.choose_relativity(origin, relativize))
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if len(servers) > 0:
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text += (u' ' + u' '.join((x.to_unicode() for x in servers)))
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return u'%u %s %s%s' % (self.algorithm, hit, key, text)
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@classmethod
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def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
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algorithm = tok.get_uint8()
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hit = binascii.unhexlify(tok.get_string().encode())
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if len(hit) > 255:
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raise dns.exception.SyntaxError("HIT too long")
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key = base64.b64decode(tok.get_string().encode())
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servers = []
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while 1:
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token = tok.get()
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if token.is_eol_or_eof():
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break
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server = dns.name.from_text(token.value, origin)
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server.choose_relativity(origin, relativize)
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servers.append(server)
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return cls(rdclass, rdtype, hit, algorithm, key, servers)
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def to_wire(self, file, compress=None, origin=None):
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lh = len(self.hit)
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lk = len(self.key)
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file.write(struct.pack("!BBH", lh, self.algorithm, lk))
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file.write(self.hit)
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file.write(self.key)
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for server in self.servers:
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server.to_wire(file, None, origin)
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@classmethod
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def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
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(lh, algorithm, lk) = struct.unpack('!BBH',
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wire[current: current + 4])
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current += 4
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rdlen -= 4
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hit = wire[current: current + lh].unwrap()
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current += lh
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rdlen -= lh
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key = wire[current: current + lk].unwrap()
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current += lk
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rdlen -= lk
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servers = []
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while rdlen > 0:
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(server, cused) = dns.name.from_wire(wire[: current + rdlen],
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current)
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current += cused
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rdlen -= cused
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if origin is not None:
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server = server.relativize(origin)
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servers.append(server)
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return cls(rdclass, rdtype, hit, algorithm, key, servers)
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def choose_relativity(self, origin=None, relativize=True):
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servers = []
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for server in self.servers:
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server = server.choose_relativity(origin, relativize)
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servers.append(server)
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self.servers = servers
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