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packet_unpacker.go
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packet_unpacker.go
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package quic
import (
"bytes"
"fmt"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/wire"
"github.com/lucas-clemente/quic-go/qerr"
)
type unpackedPacket struct {
encryptionLevel protocol.EncryptionLevel
frames []wire.Frame
}
type quicAEAD interface {
Open(dst, src []byte, packetNumber protocol.PacketNumber, associatedData []byte) ([]byte, protocol.EncryptionLevel, error)
}
type packetUnpacker struct {
version protocol.VersionNumber
aead quicAEAD
}
func (u *packetUnpacker) Unpack(headerBinary []byte, hdr *wire.Header, data []byte) (*unpackedPacket, error) {
buf := getPacketBuffer()
defer putPacketBuffer(buf)
decrypted, encryptionLevel, err := u.aead.Open(buf, data, hdr.PacketNumber, headerBinary)
if err != nil {
// Wrap err in quicError so that public reset is sent by session
return nil, qerr.Error(qerr.DecryptionFailure, err.Error())
}
r := bytes.NewReader(decrypted)
if r.Len() == 0 {
return nil, qerr.MissingPayload
}
fs := make([]wire.Frame, 0, 2)
// Read all frames in the packet
for r.Len() > 0 {
typeByte, _ := r.ReadByte()
if typeByte == 0x0 { // PADDING frame
continue
}
r.UnreadByte()
frame, err := u.parseFrame(r, typeByte, hdr)
if err != nil {
return nil, err
}
if sf, ok := frame.(*wire.StreamFrame); ok {
if sf.StreamID != u.version.CryptoStreamID() && encryptionLevel <= protocol.EncryptionUnencrypted {
return nil, qerr.Error(qerr.UnencryptedStreamData, fmt.Sprintf("received unencrypted stream data on stream %d", sf.StreamID))
}
}
if frame != nil {
fs = append(fs, frame)
}
}
return &unpackedPacket{
encryptionLevel: encryptionLevel,
frames: fs,
}, nil
}
func (u *packetUnpacker) parseFrame(r *bytes.Reader, typeByte byte, hdr *wire.Header) (wire.Frame, error) {
if u.version.UsesIETFFrameFormat() {
return u.parseIETFFrame(r, typeByte, hdr)
}
return u.parseGQUICFrame(r, typeByte, hdr)
}
func (u *packetUnpacker) parseIETFFrame(r *bytes.Reader, typeByte byte, hdr *wire.Header) (wire.Frame, error) {
var frame wire.Frame
var err error
if typeByte&0xf8 == 0x10 {
frame, err = wire.ParseStreamFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidStreamData, err.Error())
}
return frame, err
}
// TODO: implement all IETF QUIC frame types
switch typeByte {
case 0x1:
frame, err = wire.ParseRstStreamFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidRstStreamData, err.Error())
}
case 0x2:
frame, err = wire.ParseConnectionCloseFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidConnectionCloseData, err.Error())
}
case 0x4:
frame, err = wire.ParseMaxDataFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidWindowUpdateData, err.Error())
}
case 0x5:
frame, err = wire.ParseMaxStreamDataFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidWindowUpdateData, err.Error())
}
case 0x6:
frame, err = wire.ParseMaxStreamIDFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidFrameData, err.Error())
}
case 0x7:
frame, err = wire.ParsePingFrame(r, u.version)
case 0x8:
frame, err = wire.ParseBlockedFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidBlockedData, err.Error())
}
case 0x9:
frame, err = wire.ParseStreamBlockedFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidBlockedData, err.Error())
}
case 0xa:
frame, err = wire.ParseStreamIDBlockedFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidFrameData, err.Error())
}
case 0xc:
frame, err = wire.ParseStopSendingFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidFrameData, err.Error())
}
case 0xe:
frame, err = wire.ParseAckFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidAckData, err.Error())
}
default:
err = qerr.Error(qerr.InvalidFrameData, fmt.Sprintf("unknown type byte 0x%x", typeByte))
}
return frame, err
}
func (u *packetUnpacker) parseGQUICFrame(r *bytes.Reader, typeByte byte, hdr *wire.Header) (wire.Frame, error) {
var frame wire.Frame
var err error
if typeByte&0x80 == 0x80 {
frame, err = wire.ParseStreamFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidStreamData, err.Error())
}
return frame, err
} else if typeByte&0xc0 == 0x40 {
frame, err = wire.ParseAckFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidAckData, err.Error())
}
return frame, err
}
switch typeByte {
case 0x1:
frame, err = wire.ParseRstStreamFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidRstStreamData, err.Error())
}
case 0x2:
frame, err = wire.ParseConnectionCloseFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidConnectionCloseData, err.Error())
}
case 0x3:
frame, err = wire.ParseGoawayFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidGoawayData, err.Error())
}
case 0x4:
frame, err = wire.ParseWindowUpdateFrame(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidWindowUpdateData, err.Error())
}
case 0x5:
frame, err = wire.ParseBlockedFrameLegacy(r, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidBlockedData, err.Error())
}
case 0x6:
frame, err = wire.ParseStopWaitingFrame(r, hdr.PacketNumber, hdr.PacketNumberLen, u.version)
if err != nil {
err = qerr.Error(qerr.InvalidStopWaitingData, err.Error())
}
case 0x7:
frame, err = wire.ParsePingFrame(r, u.version)
default:
err = qerr.Error(qerr.InvalidFrameData, fmt.Sprintf("unknown type byte 0x%x", typeByte))
}
return frame, err
}