74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
package frames
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"io"
|
|
"math"
|
|
|
|
"github.com/lucas-clemente/quic-go/protocol"
|
|
"github.com/lucas-clemente/quic-go/qerr"
|
|
"github.com/lucas-clemente/quic-go/utils"
|
|
)
|
|
|
|
// A ConnectionCloseFrame in QUIC
|
|
type ConnectionCloseFrame struct {
|
|
ErrorCode qerr.ErrorCode
|
|
ReasonPhrase string
|
|
}
|
|
|
|
// ParseConnectionCloseFrame reads a CONNECTION_CLOSE frame
|
|
func ParseConnectionCloseFrame(r *bytes.Reader) (*ConnectionCloseFrame, error) {
|
|
frame := &ConnectionCloseFrame{}
|
|
|
|
// read the TypeByte
|
|
_, err := r.ReadByte()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
errorCode, err := utils.ReadUint32(r)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
frame.ErrorCode = qerr.ErrorCode(errorCode)
|
|
|
|
reasonPhraseLen, err := utils.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.WriteUint32(b, uint32(f.ErrorCode))
|
|
|
|
if len(f.ReasonPhrase) > math.MaxUint16 {
|
|
return errors.New("ConnectionFrame: ReasonPhrase too long")
|
|
}
|
|
|
|
reasonPhraseLen := uint16(len(f.ReasonPhrase))
|
|
utils.WriteUint16(b, reasonPhraseLen)
|
|
b.WriteString(f.ReasonPhrase)
|
|
|
|
return nil
|
|
}
|