package tls
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import (
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"context"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/dice"
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)
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// DTLS writes header as DTLS. See https://tools.ietf.org/html/rfc6347
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type DTLS struct {
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epoch uint16
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length uint16
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sequence uint32
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}
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// Size implements PacketHeader.
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func (*DTLS) Size() int32 {
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return 1 + 2 + 2 + 6 + 2
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}
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// Serialize implements PacketHeader.
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func (d *DTLS) Serialize(b []byte) {
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b[0] = 23 // application data
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b[1] = 254
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b[2] = 253
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b[3] = byte(d.epoch >> 8)
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b[4] = byte(d.epoch)
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b[5] = 0
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b[6] = 0
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b[7] = byte(d.sequence >> 24)
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b[8] = byte(d.sequence >> 16)
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b[9] = byte(d.sequence >> 8)
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b[10] = byte(d.sequence)
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d.sequence++
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b[11] = byte(d.length >> 8)
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b[12] = byte(d.length)
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d.length += 17
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if d.length > 100 {
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d.length -= 50
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}
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}
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// New creates a new UTP header for the given config.
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func New(ctx context.Context, config interface{}) (interface{}, error) {
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return &DTLS{
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epoch: dice.RollUint16(),
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sequence: 0,
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length: 17,
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}, nil
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}
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func init() {
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common.Must(common.RegisterConfig((*PacketConfig)(nil), New))
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}
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