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v2ray-core/external/github.com/lucas-clemente/quic-go/crypto_stream.go

109 lines
2.8 KiB

package quic
import (
"errors"
"fmt"
"io"
"v2ray.com/core/external/github.com/lucas-clemente/quic-go/internal/protocol"
"v2ray.com/core/external/github.com/lucas-clemente/quic-go/internal/utils"
"v2ray.com/core/external/github.com/lucas-clemente/quic-go/internal/wire"
)
type cryptoStream interface {
// for receiving data
HandleCryptoFrame(*wire.CryptoFrame) error
GetCryptoData() []byte
Finish() error
// for sending data
io.Writer
HasData() bool
PopCryptoFrame(protocol.ByteCount) *wire.CryptoFrame
}
type cryptoStreamImpl struct {
queue *frameSorter
msgBuf []byte
highestOffset protocol.ByteCount
finished bool
writeOffset protocol.ByteCount
writeBuf []byte
}
func newCryptoStream() cryptoStream {
return &cryptoStreamImpl{
queue: newFrameSorter(),
}
}
func (s *cryptoStreamImpl) HandleCryptoFrame(f *wire.CryptoFrame) error {
highestOffset := f.Offset + protocol.ByteCount(len(f.Data))
if maxOffset := highestOffset; maxOffset > protocol.MaxCryptoStreamOffset {
return fmt.Errorf("received invalid offset %d on crypto stream, maximum allowed %d", maxOffset, protocol.MaxCryptoStreamOffset)
}
if s.finished {
if highestOffset > s.highestOffset {
// reject crypto data received after this stream was already finished
return errors.New("received crypto data after change of encryption level")
}
// ignore data with a smaller offset than the highest received
// could e.g. be a retransmission
return nil
}
s.highestOffset = utils.MaxByteCount(s.highestOffset, highestOffset)
if err := s.queue.Push(f.Data, f.Offset, false); err != nil {
return err
}
for {
data, _ := s.queue.Pop()
if data == nil {
return nil
}
s.msgBuf = append(s.msgBuf, data...)
}
}
// GetCryptoData retrieves data that was received in CRYPTO frames
func (s *cryptoStreamImpl) GetCryptoData() []byte {
if len(s.msgBuf) < 4 {
return nil
}
msgLen := 4 + int(s.msgBuf[1])<<16 + int(s.msgBuf[2])<<8 + int(s.msgBuf[3])
if len(s.msgBuf) < msgLen {
return nil
}
msg := make([]byte, msgLen)
copy(msg, s.msgBuf[:msgLen])
s.msgBuf = s.msgBuf[msgLen:]
return msg
}
func (s *cryptoStreamImpl) Finish() error {
if s.queue.HasMoreData() {
return errors.New("encryption level changed, but crypto stream has more data to read")
}
s.finished = true
return nil
}
// Writes writes data that should be sent out in CRYPTO frames
func (s *cryptoStreamImpl) Write(p []byte) (int, error) {
s.writeBuf = append(s.writeBuf, p...)
return len(p), nil
}
func (s *cryptoStreamImpl) HasData() bool {
return len(s.writeBuf) > 0
}
func (s *cryptoStreamImpl) PopCryptoFrame(maxLen protocol.ByteCount) *wire.CryptoFrame {
f := &wire.CryptoFrame{Offset: s.writeOffset}
n := utils.MinByteCount(f.MaxDataLen(maxLen), protocol.ByteCount(len(s.writeBuf)))
f.Data = s.writeBuf[:n]
s.writeBuf = s.writeBuf[n:]
s.writeOffset += n
return f
}