mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-14 12:43:18 +00:00
56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package tls
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/xtls/xray-core/common"
|
|
"github.com/xtls/xray-core/common/dice"
|
|
)
|
|
|
|
// DTLS writes header as DTLS. See https://tools.ietf.org/html/rfc6347
|
|
type DTLS struct {
|
|
epoch uint16
|
|
length uint16
|
|
sequence uint32
|
|
}
|
|
|
|
// Size implements PacketHeader.
|
|
func (*DTLS) Size() int32 {
|
|
return 1 + 2 + 2 + 6 + 2
|
|
}
|
|
|
|
// Serialize implements PacketHeader.
|
|
func (d *DTLS) Serialize(b []byte) {
|
|
b[0] = 23 // application data
|
|
b[1] = 254
|
|
b[2] = 253
|
|
b[3] = byte(d.epoch >> 8)
|
|
b[4] = byte(d.epoch)
|
|
b[5] = 0
|
|
b[6] = 0
|
|
b[7] = byte(d.sequence >> 24)
|
|
b[8] = byte(d.sequence >> 16)
|
|
b[9] = byte(d.sequence >> 8)
|
|
b[10] = byte(d.sequence)
|
|
d.sequence++
|
|
b[11] = byte(d.length >> 8)
|
|
b[12] = byte(d.length)
|
|
d.length += 17
|
|
if d.length > 100 {
|
|
d.length -= 50
|
|
}
|
|
}
|
|
|
|
// New creates a new UTP header for the given config.
|
|
func New(ctx context.Context, config interface{}) (interface{}, error) {
|
|
return &DTLS{
|
|
epoch: dice.RollUint16(),
|
|
sequence: 0,
|
|
length: 17,
|
|
}, nil
|
|
}
|
|
|
|
func init() {
|
|
common.Must(common.RegisterConfig((*PacketConfig)(nil), New))
|
|
}
|