03b42e23d4
As discussed on the mailing list, there is no good packet library (parses and builds various protocol packets). dpkt isn't flexible enough (can't nicely handle stacked protocols such as vlan, mpls, gre). NOX's one is nice but released under GPL3. So we need our own packet library. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
50 lines
1.5 KiB
Python
50 lines
1.5 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 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.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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offset = 0
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self.data = bytearray()
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for p in self.protocols:
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p.serialize(self.data, offset)
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offset += p.length
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def add_protocol(self, proto):
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self.protocols.append(proto)
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def find_protocol(self, name):
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for p in self.protocols:
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if p.__class__.__name__ == name:
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return p
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