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// Copyright 2012 Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
package layers
import (
"github.com/google/gopacket"
)
// BaseLayer is a convenience struct which implements the LayerData and
// LayerPayload functions of the Layer interface.
type BaseLayer struct {
// Contents is the set of bytes that make up this layer. IE: for an
// Ethernet packet, this would be the set of bytes making up the
// Ethernet frame.
Contents []byte
// Payload is the set of bytes contained by (but not part of) this
// Layer. Again, to take Ethernet as an example, this would be the
// set of bytes encapsulated by the Ethernet protocol.
Payload []byte
}
// LayerContents returns the bytes of the packet layer.
func (b *BaseLayer) LayerContents() []byte { return b.Contents }
// LayerPayload returns the bytes contained within the packet layer.
func (b *BaseLayer) LayerPayload() []byte { return b.Payload }
type layerDecodingLayer interface {
gopacket.Layer
DecodeFromBytes([]byte, gopacket.DecodeFeedback) error
NextLayerType() gopacket.LayerType
}
func decodingLayerDecoder(d layerDecodingLayer, data []byte, p gopacket.PacketBuilder) error {
err := d.DecodeFromBytes(data, p)
if err != nil {
return err
}
p.AddLayer(d)
next := d.NextLayerType()
if next == gopacket.LayerTypeZero {
return nil
}
return p.NextDecoder(next)
}
// hacky way to zero out memory... there must be a better way?
var lotsOfZeros [1024]byte