65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
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// Copyright 2018 The GoPacket Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree.
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package etls
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import (
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"errors"
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"github.com/google/gopacket"
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)
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// ETLSchangeCipherSpec defines the message value inside ChangeCipherSpec Record
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type ETLSchangeCipherSpec uint8
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const (
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ETLSChangecipherspecMessage ETLSchangeCipherSpec = 1
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ETLSChangecipherspecUnknown ETLSchangeCipherSpec = 255
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)
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// ETLS Change Cipher Spec
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// 0 1 2 3 4 5 6 7 8
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// +--+--+--+--+--+--+--+--+
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// | Message |
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// +--+--+--+--+--+--+--+--+
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// ETLSChangeCipherSpecRecord defines the type of data inside ChangeCipherSpec Record
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type ETLSChangeCipherSpecRecord struct {
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ETLSRecordHeader
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Message ETLSchangeCipherSpec
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}
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// DecodeFromBytes decodes the slice into the ETLS struct.
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func (t *ETLSChangeCipherSpecRecord) decodeFromBytes(h ETLSRecordHeader, data []byte, df gopacket.DecodeFeedback) error {
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// ETLS Record Header
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t.ContentType = h.ContentType
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t.Version = h.Version
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t.Length = h.Length
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if len(data) != 1 {
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df.SetTruncated()
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return errors.New("ETLS Change Cipher Spec record incorrect length")
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}
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t.Message = ETLSchangeCipherSpec(data[0])
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if t.Message != ETLSChangecipherspecMessage {
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t.Message = ETLSChangecipherspecUnknown
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}
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return nil
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}
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// String shows the message value nicely formatted
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func (ccs ETLSchangeCipherSpec) String() string {
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switch ccs {
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default:
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return "Unknown"
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case ETLSChangecipherspecMessage:
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return "Change Cipher Spec Message"
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}
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}
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