fd692d330d
- Now easy to know the protocol name and iterate protocols. - find_protocol doesn't handle the case the same protocols are stacked. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
67 lines
2.0 KiB
Python
67 lines
2.0 KiB
Python
# Copyright (C) 2012 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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from . import packet_base
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from . import ethernet
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class Packet(object):
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def __init__(self, data=None):
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super(Packet, self).__init__()
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self.data = data
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self.protocols = []
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self.protocol_idx = 0
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self.parsed_bytes = 0
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if self.data:
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# Do we need to handle non ethernet?
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self.parser(ethernet.ethernet)
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def parser(self, cls):
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while cls:
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proto, cls = cls.parser(self.data[self.parsed_bytes:])
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if proto:
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self.parsed_bytes += proto.length
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self.protocols.append(proto)
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def serialize(self):
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self.data = bytearray()
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r = self.protocols[::-1]
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for i, p in enumerate(r):
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if p.__class__.__bases__[0] == packet_base.PacketBase:
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if i == len(r) - 1:
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prev = None
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else:
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prev = r[i + 1]
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data = p.serialize(self.data, prev)
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else:
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data = str(p)
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self.data = data + self.data
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def add_protocol(self, proto):
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self.protocols.append(proto)
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def next(self):
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try:
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p = self.protocols[self.protocol_idx]
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except:
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self.protocol_idx = 0
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raise StopIteration
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self.protocol_idx += 1
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return p
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def __iter__(self):
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return self
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