mirror of https://github.com/morpheus65535/bazarr
149 lines
5.5 KiB
Python
149 lines
5.5 KiB
Python
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# Copyright (C) 2006, 2007, 2009-2011 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 dns.exception
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import dns.inet
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import dns.name
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class IPSECKEY(dns.rdata.Rdata):
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"""IPSECKEY record
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@ivar precedence: the precedence for this key data
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@type precedence: int
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@ivar gateway_type: the gateway type
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@type gateway_type: int
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@ivar algorithm: the algorithm to use
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@type algorithm: int
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@ivar gateway: the public key
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@type gateway: None, IPv4 address, IPV6 address, or domain name
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@ivar key: the public key
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@type key: string
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@see: RFC 4025"""
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__slots__ = ['precedence', 'gateway_type', 'algorithm', 'gateway', 'key']
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def __init__(self, rdclass, rdtype, precedence, gateway_type, algorithm,
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gateway, key):
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super(IPSECKEY, self).__init__(rdclass, rdtype)
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if gateway_type == 0:
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if gateway != '.' and gateway is not None:
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raise SyntaxError('invalid gateway for gateway type 0')
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gateway = None
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elif gateway_type == 1:
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# check that it's OK
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dns.inet.inet_pton(dns.inet.AF_INET, gateway)
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elif gateway_type == 2:
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# check that it's OK
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dns.inet.inet_pton(dns.inet.AF_INET6, gateway)
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elif gateway_type == 3:
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pass
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else:
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raise SyntaxError(
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'invalid IPSECKEY gateway type: %d' % gateway_type)
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self.precedence = precedence
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self.gateway_type = gateway_type
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self.algorithm = algorithm
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self.gateway = gateway
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self.key = key
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def to_text(self, origin=None, relativize=True, **kw):
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if self.gateway_type == 0:
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gateway = '.'
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elif self.gateway_type == 1:
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gateway = self.gateway
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elif self.gateway_type == 2:
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gateway = self.gateway
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elif self.gateway_type == 3:
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gateway = str(self.gateway.choose_relativity(origin, relativize))
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else:
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raise ValueError('invalid gateway type')
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return '%d %d %d %s %s' % (self.precedence, self.gateway_type,
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self.algorithm, gateway,
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dns.rdata._base64ify(self.key))
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@classmethod
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def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
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precedence = tok.get_uint8()
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gateway_type = tok.get_uint8()
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algorithm = tok.get_uint8()
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if gateway_type == 3:
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gateway = tok.get_name().choose_relativity(origin, relativize)
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else:
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gateway = tok.get_string()
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chunks = []
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while 1:
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t = tok.get().unescape()
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if t.is_eol_or_eof():
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break
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if not t.is_identifier():
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raise dns.exception.SyntaxError
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chunks.append(t.value.encode())
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b64 = b''.join(chunks)
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key = base64.b64decode(b64)
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return cls(rdclass, rdtype, precedence, gateway_type, algorithm,
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gateway, key)
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def to_wire(self, file, compress=None, origin=None):
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header = struct.pack("!BBB", self.precedence, self.gateway_type,
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self.algorithm)
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file.write(header)
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if self.gateway_type == 0:
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pass
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elif self.gateway_type == 1:
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file.write(dns.inet.inet_pton(dns.inet.AF_INET, self.gateway))
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elif self.gateway_type == 2:
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file.write(dns.inet.inet_pton(dns.inet.AF_INET6, self.gateway))
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elif self.gateway_type == 3:
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self.gateway.to_wire(file, None, origin)
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else:
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raise ValueError('invalid gateway type')
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file.write(self.key)
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@classmethod
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def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
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if rdlen < 3:
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raise dns.exception.FormError
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header = struct.unpack('!BBB', wire[current: current + 3])
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gateway_type = header[1]
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current += 3
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rdlen -= 3
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if gateway_type == 0:
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gateway = None
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elif gateway_type == 1:
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gateway = dns.inet.inet_ntop(dns.inet.AF_INET,
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wire[current: current + 4])
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current += 4
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rdlen -= 4
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elif gateway_type == 2:
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gateway = dns.inet.inet_ntop(dns.inet.AF_INET6,
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wire[current: current + 16])
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current += 16
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rdlen -= 16
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elif gateway_type == 3:
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(gateway, 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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else:
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raise dns.exception.FormError('invalid IPSECKEY gateway type')
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key = wire[current: current + rdlen].unwrap()
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return cls(rdclass, rdtype, header[0], gateway_type, header[2],
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gateway, key)
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