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connection_close_frame.go
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/
connection_close_frame.go
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package wire
import (
"bytes"
"errors"
"io"
"math"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/utils"
"github.com/lucas-clemente/quic-go/qerr"
)
// A ConnectionCloseFrame in QUIC
type ConnectionCloseFrame struct {
ErrorCode qerr.ErrorCode
ReasonPhrase string
}
// ParseConnectionCloseFrame reads a CONNECTION_CLOSE frame
func ParseConnectionCloseFrame(r *bytes.Reader, version protocol.VersionNumber) (*ConnectionCloseFrame, error) {
frame := &ConnectionCloseFrame{}
// read the TypeByte
_, err := r.ReadByte()
if err != nil {
return nil, err
}
errorCode, err := utils.GetByteOrder(version).ReadUint32(r)
if err != nil {
return nil, err
}
frame.ErrorCode = qerr.ErrorCode(errorCode)
reasonPhraseLen, err := utils.GetByteOrder(version).ReadUint16(r)
if err != nil {
return nil, err
}
if reasonPhraseLen > uint16(protocol.MaxPacketSize) {
return nil, qerr.Error(qerr.InvalidConnectionCloseData, "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
}
// MinLength of a written frame
func (f *ConnectionCloseFrame) MinLength(version protocol.VersionNumber) (protocol.ByteCount, error) {
return 1 + 4 + 2 + protocol.ByteCount(len(f.ReasonPhrase)), nil
}
// Write writes an CONNECTION_CLOSE frame.
func (f *ConnectionCloseFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
b.WriteByte(0x02)
utils.GetByteOrder(version).WriteUint32(b, uint32(f.ErrorCode))
if len(f.ReasonPhrase) > math.MaxUint16 {
return errors.New("ConnectionFrame: ReasonPhrase too long")
}
reasonPhraseLen := uint16(len(f.ReasonPhrase))
utils.GetByteOrder(version).WriteUint16(b, reasonPhraseLen)
b.WriteString(f.ReasonPhrase)
return nil
}