Пример #1
0
 def test_parse_invalid_length(self):
     # invalid length
     self.assertRaises(excep.UpdateMessageError, ClusterList.parse,
                       b'\x01\x01\x01\x01\x01\x02\x02\x02\x02\x03\x03\x03\x03')
     try:
         ClusterList.parse(value=b'\x01\x01\x01\x01\x01\x02\x02\x02\x02\x03\x03\x03\x03')
     except excep.UpdateMessageError as e:
         self.assertEqual(ERR_MSG_UPDATE_ATTR_LEN, e.sub_error)
Пример #2
0
    def construct_attributes(attr_dict, asn4=False):

        """
        construts BGP Update attirubte.

        :param attr_dict: bgp attribute dictionary
        :param asn4: support 4 bytes asn or not
        """
        attr_raw_hex = b''
        for type_code, value in attr_dict.items():

            if type_code == bgp_cons.BGPTYPE_ORIGIN:
                origin_hex = Origin.construct(value=value)
                attr_raw_hex += origin_hex

            elif type_code == bgp_cons.BGPTYPE_AS_PATH:
                aspath_hex = ASPath.construct(value=value, asn4=asn4)
                attr_raw_hex += aspath_hex

            elif type_code == bgp_cons.BGPTYPE_NEXT_HOP:
                nexthop_hex = NextHop.construct(value=value)
                attr_raw_hex += nexthop_hex

            elif type_code == bgp_cons.BGPTYPE_MULTI_EXIT_DISC:
                med_hex = MED.construct(value=value)
                attr_raw_hex += med_hex

            elif type_code == bgp_cons.BGPTYPE_LOCAL_PREF:
                localpre_hex = LocalPreference.construct(value=value)
                attr_raw_hex += localpre_hex

            elif type_code == bgp_cons.BGPTYPE_ATOMIC_AGGREGATE:
                atomicaggregate_hex = AtomicAggregate.construct(value=value)
                attr_raw_hex += atomicaggregate_hex

            elif type_code == bgp_cons.BGPTYPE_AGGREGATOR:
                aggregator_hex = Aggregator.construct(value=value, asn4=asn4)
                attr_raw_hex += aggregator_hex

            elif type_code == bgp_cons.BGPTYPE_COMMUNITIES:
                community_hex = Community.construct(value=value)
                attr_raw_hex += community_hex

            elif type_code == bgp_cons.BGPTYPE_ORIGINATOR_ID:
                originatorid_hex = OriginatorID.construct(value=value)
                attr_raw_hex += originatorid_hex

            elif type_code == bgp_cons.BGPTYPE_CLUSTER_LIST:
                clusterlist_hex = ClusterList.construct(value=value)
                attr_raw_hex += clusterlist_hex

        return attr_raw_hex
Пример #3
0
    def parse_attributes(data, asn4=False):
        """
        Parses an RFC4271 encoded blob of BGP attributes into a list

        :param data:
        :param asn4: support 4 bytes asn or not
        :return:
        """
        attributes = {}
        postfix = data
        while len(postfix) > 0:

            try:
                flags, type_code = struct.unpack('!BB', postfix[:2])

                if flags & AttributeFlag.EXTENDED_LENGTH:
                    attr_len = struct.unpack('!H', postfix[2:4])[0]
                    attr_value = postfix[4:4 + attr_len]
                    postfix = postfix[4 + attr_len:]    # Next attribute
                else:    # standard 1-octet length
                    if isinstance(postfix[2], int):
                        attr_len = postfix[2]
                    else:
                        attr_len = ord(postfix[2])
                    attr_value = postfix[3:3 + attr_len]
                    postfix = postfix[3 + attr_len:]    # Next attribute
            except Exception as e:
                LOG.error(e)
                error_str = traceback.format_exc()
                LOG.debug(error_str)
                raise excep.UpdateMessageError(
                    sub_error=bgp_cons.ERR_MSG_UPDATE_MALFORMED_ATTR_LIST,
                    data='')

            if type_code == bgp_cons.BGPTYPE_ORIGIN:

                decode_value = Origin.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_AS_PATH:

                decode_value = ASPath.parse(value=attr_value, asn4=asn4)

            elif type_code == bgp_cons.BGPTYPE_NEXT_HOP:

                decode_value = NextHop.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_MULTI_EXIT_DISC:

                decode_value = MED.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_LOCAL_PREF:

                decode_value = LocalPreference.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_ATOMIC_AGGREGATE:

                decode_value = AtomicAggregate.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_AGGREGATOR:

                decode_value = Aggregator.parse(value=attr_value, asn4=asn4)

            elif type_code == bgp_cons.BGPTYPE_COMMUNITIES:

                decode_value = Community.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_ORIGINATOR_ID:

                decode_value = OriginatorID.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_CLUSTER_LIST:

                decode_value = ClusterList.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_NEW_AS_PATH:

                decode_value = ASPath.parse(value=attr_value, asn4=True)

            elif type_code == bgp_cons.BGPTYPE_NEW_AGGREGATOR:

                decode_value = Aggregator.parse(value=attr_value, asn4=True)

            elif type_code == bgp_cons.BGPTYPE_MP_REACH_NLRI:
                decode_value = MpReachNLRI.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_MP_UNREACH_NLRI:
                decode_value = MpUnReachNLRI.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_EXTENDED_COMMUNITY:
                decode_value = ExtCommunity.parse(value=attr_value)
            elif type_code == bgp_cons.BGPTYPE_PMSI_TUNNEL:
                decode_value = PMSITunnel.parse(value=attr_value)
            else:
                decode_value = repr(attr_value)
            attributes[type_code] = decode_value

        return attributes
Пример #4
0
    def test_construct(self):

        cluster_list = ClusterList.construct(value=['1.1.1.1', '2.2.2.2', '3.3.3.3'])
        self.assertEqual(b'\x80\n\x0c\x01\x01\x01\x01\x02\x02\x02\x02\x03\x03\x03\x03', cluster_list)
Пример #5
0
    def test_parse(self):

        cluster_list = ClusterList.parse(value=b'\x01\x01\x01\x01\x02\x02\x02\x02\x03\x03\x03\x03')
        self.assertEqual(['1.1.1.1', '2.2.2.2', '3.3.3.3'], cluster_list)