66 lines
1.9 KiB
Go
66 lines
1.9 KiB
Go
package wire
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"github.com/lucas-clemente/quic-go/internal/handshake"
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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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)
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// A PublicReset is a PUBLIC_RESET
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type PublicReset struct {
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RejectedPacketNumber protocol.PacketNumber
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Nonce uint64
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}
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// WritePublicReset writes a Public Reset
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func WritePublicReset(connectionID protocol.ConnectionID, rejectedPacketNumber protocol.PacketNumber, nonceProof uint64) []byte {
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b := &bytes.Buffer{}
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b.WriteByte(0x0a)
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utils.BigEndian.WriteUint64(b, uint64(connectionID))
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utils.LittleEndian.WriteUint32(b, uint32(handshake.TagPRST))
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utils.LittleEndian.WriteUint32(b, 2)
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utils.LittleEndian.WriteUint32(b, uint32(handshake.TagRNON))
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utils.LittleEndian.WriteUint32(b, 8)
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utils.LittleEndian.WriteUint32(b, uint32(handshake.TagRSEQ))
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utils.LittleEndian.WriteUint32(b, 16)
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utils.LittleEndian.WriteUint64(b, nonceProof)
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utils.LittleEndian.WriteUint64(b, uint64(rejectedPacketNumber))
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return b.Bytes()
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}
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// ParsePublicReset parses a Public Reset
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func ParsePublicReset(r *bytes.Reader) (*PublicReset, error) {
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pr := PublicReset{}
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msg, err := handshake.ParseHandshakeMessage(r)
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if err != nil {
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return nil, err
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}
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if msg.Tag != handshake.TagPRST {
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return nil, errors.New("wrong public reset tag")
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}
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// The RSEQ tag is mandatory according to the gQUIC wire spec.
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// However, Google doesn't send RSEQ in their Public Resets.
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// Therefore, we'll treat RSEQ as an optional field.
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if rseq, ok := msg.Data[handshake.TagRSEQ]; ok {
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if len(rseq) != 8 {
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return nil, errors.New("invalid RSEQ tag")
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}
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pr.RejectedPacketNumber = protocol.PacketNumber(binary.LittleEndian.Uint64(rseq))
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}
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rnon, ok := msg.Data[handshake.TagRNON]
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if !ok {
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return nil, errors.New("RNON missing")
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}
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if len(rnon) != 8 {
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return nil, errors.New("invalid RNON tag")
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}
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pr.Nonce = binary.LittleEndian.Uint64(rnon)
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return &pr, nil
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}
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