package wire import ( "bytes" "io" "github.com/lucas-clemente/quic-go/internal/protocol" "github.com/lucas-clemente/quic-go/internal/utils" "github.com/lucas-clemente/quic-go/qerr" ) // A GoawayFrame is a GOAWAY frame type GoawayFrame struct { ErrorCode qerr.ErrorCode LastGoodStream protocol.StreamID ReasonPhrase string } // ParseGoawayFrame parses a GOAWAY frame func ParseGoawayFrame(r *bytes.Reader, _ protocol.VersionNumber) (*GoawayFrame, error) { frame := &GoawayFrame{} if _, err := r.ReadByte(); err != nil { return nil, err } errorCode, err := utils.BigEndian.ReadUint32(r) if err != nil { return nil, err } frame.ErrorCode = qerr.ErrorCode(errorCode) lastGoodStream, err := utils.BigEndian.ReadUint32(r) if err != nil { return nil, err } frame.LastGoodStream = protocol.StreamID(lastGoodStream) reasonPhraseLen, err := utils.BigEndian.ReadUint16(r) if err != nil { return nil, err } if reasonPhraseLen > uint16(protocol.MaxPacketSize) { return nil, qerr.Error(qerr.InvalidGoawayData, "reason phrase too long") } reasonPhrase := make([]byte, reasonPhraseLen) if _, err := io.ReadFull(r, reasonPhrase); err != nil { return nil, err } frame.ReasonPhrase = string(reasonPhrase) return frame, nil } func (f *GoawayFrame) Write(b *bytes.Buffer, _ protocol.VersionNumber) error { b.WriteByte(0x03) utils.BigEndian.WriteUint32(b, uint32(f.ErrorCode)) utils.BigEndian.WriteUint32(b, uint32(f.LastGoodStream)) utils.BigEndian.WriteUint16(b, uint16(len(f.ReasonPhrase))) b.WriteString(f.ReasonPhrase) return nil } // MinLength of a written frame func (f *GoawayFrame) MinLength(version protocol.VersionNumber) (protocol.ByteCount, error) { return protocol.ByteCount(1 + 4 + 4 + 2 + len(f.ReasonPhrase)), nil }