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