24e9c1546d
Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
126 lines
3.9 KiB
Python
126 lines
3.9 KiB
Python
# Copyright (C) 2013 Nippon Telegraph and Telephone Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import struct
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NETFLOW_V1 = 0x01
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NETFLOW_V5 = 0x05
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NETFLOW_V6 = 0x06
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NETFLOW_V7 = 0x07
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NETFLOW_V8 = 0x08
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NETFLOW_V9 = 0x09
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class NetFlow(object):
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_PACK_STR = '!H'
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_NETFLOW_VERSIONS = {}
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@staticmethod
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def register_netflow_version(version):
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def _register_netflow_version(cls):
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NetFlow._NETFLOW_VERSIONS[version] = cls
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return cls
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return _register_netflow_version
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def __init__(self):
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super(NetFlow, self).__init__()
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@classmethod
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def parser(cls, buf):
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(version,) = struct.unpack_from(cls._PACK_STR, buf)
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cls_ = cls._NETFLOW_VERSIONS.get(version, None)
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if cls_:
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return cls_.parser(buf)
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else:
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return None
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@NetFlow.register_netflow_version(NETFLOW_V5)
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class NetFlowV5(object):
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_PACK_STR = '!HHIIIIBBH'
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_MIN_LEN = struct.calcsize(_PACK_STR)
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def __init__(self, version, count, sys_uptime, unix_secs,
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unix_nsecs, flow_sequence, engine_type, engine_id,
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sampling_interval, flows=None):
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self.version = version
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self.count = count
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self.sys_uptime = sys_uptime
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self.unix_secs = unix_secs
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self.unix_nsecs = unix_nsecs
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self.flow_sequence = flow_sequence
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self.engine_type = engine_type
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self.engine_id = engine_id
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self.sampling_interval = sampling_interval
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@classmethod
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def parser(cls, buf):
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(version, count, sys_uptime, unix_secs, unix_nsecs,
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flow_sequence, engine_type, engine_id, sampling_interval) = \
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struct.unpack_from(cls._PACK_STR, buf)
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msg = cls(version, count, sys_uptime, unix_secs, unix_nsecs,
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flow_sequence, engine_type, engine_id,
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sampling_interval)
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offset = cls._MIN_LEN
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msg.flows = []
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while len(buf) > offset:
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f = NetFlowV5Flow.parser(buf, offset)
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offset += NetFlowV5Flow._MIN_LEN
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msg.flows.append(f)
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return msg
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class NetFlowV5Flow(object):
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_PACK_STR = '!IIIHHIIIIHHxBBBHHBB2x'
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_MIN_LEN = struct.calcsize(_PACK_STR)
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def __init__(self, srcaddr, dstaddr, nexthop, input_, output,
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dpkts, doctets, first, last, srcport, dstport,
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tcp_flags, prot, tos, src_as, dst_as, src_mask,
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dst_mask):
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self.srcaddr = srcaddr
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self.dstaddr = dstaddr
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self.nexthop = nexthop
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self.input = input_
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self.output = output
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self.dpkts = dpkts
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self.doctets = doctets
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self.first = first
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self.last = last
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self.srcport = srcport
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self.dstport = dstport
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self.tcp_flags = tcp_flags
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self.prot = prot
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self.tos = tos
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self.src_as = src_as
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self.dst_as = dst_as
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self.src_mask = src_mask
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self.dst_mask = dst_mask
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@classmethod
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def parser(cls, buf, offset):
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(srcaddr, dstaddr, nexthop, input_, output, dpkts, doctets,
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first, last, srcport, dstport, tcp_flags, prot, tos, src_as,
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dst_as, src_mask, dst_mask) = struct.unpack_from(
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cls._PACK_STR, buf, offset)
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msg = cls(srcaddr, dstaddr, nexthop, input_, output, dpkts,
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doctets, first, last, srcport, dstport, tcp_flags,
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prot, tos, src_as, dst_as, src_mask, dst_mask)
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return msg
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