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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 (
"encoding/binary"
"github.com/google/gopacket"
)
// EAPOL defines an EAP over LAN (802.1x) layer.
type EAPOL struct {
BaseLayer
Version uint8
Type EAPOLType
Length uint16
}
// LayerType returns LayerTypeEAPOL.
func (e *EAPOL) LayerType() gopacket.LayerType { return LayerTypeEAPOL }
// DecodeFromBytes decodes the given bytes into this layer.
func (e *EAPOL) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
e.Version = data[0]
e.Type = EAPOLType(data[1])
e.Length = binary.BigEndian.Uint16(data[2:4])
e.BaseLayer = BaseLayer{data[:4], data[4:]}
return nil
}
// SerializeTo writes the serialized form of this layer into the
// SerializationBuffer, implementing gopacket.SerializableLayer
func (e *EAPOL) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
bytes, _ := b.PrependBytes(4)
bytes[0] = e.Version
bytes[1] = byte(e.Type)
binary.BigEndian.PutUint16(bytes[2:], e.Length)
return nil
}
// CanDecode returns the set of layer types that this DecodingLayer can decode.
func (e *EAPOL) CanDecode() gopacket.LayerClass {
return LayerTypeEAPOL
}
// NextLayerType returns the layer type contained by this DecodingLayer.
func (e *EAPOL) NextLayerType() gopacket.LayerType {
return e.Type.LayerType()
}
func decodeEAPOL(data []byte, p gopacket.PacketBuilder) error {
e := &EAPOL{}
return decodingLayerDecoder(e, data, p)
}
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