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// Copyright 2018 The GoPacket Authors. 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 (
"errors"
"github.com/gopacket/gopacket"
)
// TLSchangeCipherSpec defines the message value inside ChangeCipherSpec Record
type TLSchangeCipherSpec uint8
const (
TLSChangecipherspecMessage TLSchangeCipherSpec = 1
TLSChangecipherspecUnknown TLSchangeCipherSpec = 255
)
// TLS Change Cipher Spec
// 0 1 2 3 4 5 6 7 8
// +--+--+--+--+--+--+--+--+
// | Message |
// +--+--+--+--+--+--+--+--+
// TLSChangeCipherSpecRecord defines the type of data inside ChangeCipherSpec Record
type TLSChangeCipherSpecRecord struct {
TLSRecordHeader
Message TLSchangeCipherSpec
}
// DecodeFromBytes decodes the slice into the TLS struct.
func (t *TLSChangeCipherSpecRecord) decodeFromBytes(h TLSRecordHeader, data []byte, df gopacket.DecodeFeedback) error {
// TLS Record Header
t.ContentType = h.ContentType
t.Version = h.Version
t.Length = h.Length
if len(data) != 1 {
df.SetTruncated()
return errors.New("TLS Change Cipher Spec record incorrect length")
}
t.Message = TLSchangeCipherSpec(data[0])
if t.Message != TLSChangecipherspecMessage {
t.Message = TLSChangecipherspecUnknown
}
return nil
}
// String shows the message value nicely formatted
func (ccs TLSchangeCipherSpec) String() string {
switch ccs {
default:
return "Unknown"
case TLSChangecipherspecMessage:
return "Change Cipher Spec Message"
}
}
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