set the packet type for handshake retransmissions

packet_packer.go

@@ -214,6 +214,7 @@ func (p *packetPacker) packHandshakeRetransmission(packet *ackhandler.Packet) (*
 		p.hasSentPacket = false
 	}
 	header := p.getHeader(packet.EncryptionLevel)
+	header.Type = packet.PacketType
 	var frames []wire.Frame
 	if p.version.UsesStopWaitingFrames() { // for gQUIC: pack a STOP_WAITING first
 		if p.stopWaiting == nil {

packet_packer_test.go

@@ -616,12 +616,14 @@ var _ = Describe("Packet packer", func() {
 
 		It("packs a retransmission for a packet sent with no encryption", func() {
 			packet := &ackhandler.Packet{
+				PacketType:      protocol.PacketTypeHandshake,
 				EncryptionLevel: protocol.EncryptionUnencrypted,
 				Frames:          []wire.Frame{sf},
 			}
 			p, err := packer.PackRetransmission(packet)
 			Expect(err).ToNot(HaveOccurred())
 			Expect(p).To(HaveLen(1))
+			Expect(p[0].header.Type).To(Equal(protocol.PacketTypeHandshake))
 			Expect(p[0].frames).To(Equal([]wire.Frame{swf, sf}))
 			Expect(p[0].encryptionLevel).To(Equal(protocol.EncryptionUnencrypted))
 		})