97 lines
2.6 KiB
Go
97 lines
2.6 KiB
Go
package wire
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import (
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"bytes"
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"errors"
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"io"
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"math"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/utils"
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"github.com/lucas-clemente/quic-go/qerr"
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)
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// A ConnectionCloseFrame in QUIC
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type ConnectionCloseFrame struct {
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ErrorCode qerr.ErrorCode
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ReasonPhrase string
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}
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// ParseConnectionCloseFrame reads a CONNECTION_CLOSE frame
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func ParseConnectionCloseFrame(r *bytes.Reader, version protocol.VersionNumber) (*ConnectionCloseFrame, error) {
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if _, err := r.ReadByte(); err != nil { // read the TypeByte
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return nil, err
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}
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var errorCode qerr.ErrorCode
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var reasonPhraseLen uint64
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if version.UsesIETFFrameFormat() {
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ec, err := utils.BigEndian.ReadUint16(r)
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if err != nil {
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return nil, err
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}
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errorCode = qerr.ErrorCode(ec)
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reasonPhraseLen, err = utils.ReadVarInt(r)
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if err != nil {
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return nil, err
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}
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} else {
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ec, err := utils.BigEndian.ReadUint32(r)
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if err != nil {
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return nil, err
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}
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errorCode = qerr.ErrorCode(ec)
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length, err := utils.BigEndian.ReadUint16(r)
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if err != nil {
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return nil, err
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}
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reasonPhraseLen = uint64(length)
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}
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// shortcut to prevent the unneccessary allocation of dataLen bytes
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// if the dataLen is larger than the remaining length of the packet
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// reading the whole reason phrase would result in EOF when attempting to READ
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if int(reasonPhraseLen) > r.Len() {
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return nil, io.EOF
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}
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reasonPhrase := make([]byte, reasonPhraseLen)
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if _, err := io.ReadFull(r, reasonPhrase); err != nil {
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// this should never happen, since we already checked the reasonPhraseLen earlier
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return nil, err
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}
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return &ConnectionCloseFrame{
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ErrorCode: qerr.ErrorCode(errorCode),
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ReasonPhrase: string(reasonPhrase),
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}, nil
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}
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// MinLength of a written frame
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func (f *ConnectionCloseFrame) MinLength(version protocol.VersionNumber) protocol.ByteCount {
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if version.UsesIETFFrameFormat() {
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return 1 + 2 + utils.VarIntLen(uint64(len(f.ReasonPhrase))) + protocol.ByteCount(len(f.ReasonPhrase))
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}
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return 1 + 4 + 2 + protocol.ByteCount(len(f.ReasonPhrase))
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}
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// Write writes an CONNECTION_CLOSE frame.
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func (f *ConnectionCloseFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
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b.WriteByte(0x02)
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if len(f.ReasonPhrase) > math.MaxUint16 {
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return errors.New("ConnectionFrame: ReasonPhrase too long")
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}
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if version.UsesIETFFrameFormat() {
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utils.BigEndian.WriteUint16(b, uint16(f.ErrorCode))
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utils.WriteVarInt(b, uint64(len(f.ReasonPhrase)))
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} else {
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utils.BigEndian.WriteUint32(b, uint32(f.ErrorCode))
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utils.BigEndian.WriteUint16(b, uint16(len(f.ReasonPhrase)))
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}
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b.WriteString(f.ReasonPhrase)
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return nil
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}
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