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Edit File : IPSECKEY.py \| Size : 5.55 KB
# 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) Back

Edit File : IPSECKEY.py | Size : 5.55 KB

# 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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