send (empty) QUIC packet to server

example/client.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"math/rand"
+	"net"
+	"time"
+
+	quic "github.com/lucas-clemente/quic-go"
+	"github.com/lucas-clemente/quic-go/crypto"
+	"github.com/lucas-clemente/quic-go/protocol"
+)
+
+func main() {
+	addr := "quic.clemente.io:6121"
+
+	udpAddr, err := net.ResolveUDPAddr("udp", addr)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(udpAddr.String())
+
+	conn, err := net.DialUDP("udp", nil, udpAddr)
+	defer conn.Close()
+	if err != nil {
+		panic(err)
+	}
+
+	rand.Seed(time.Now().UTC().UnixNano())
+	connectionID := protocol.ConnectionID(0x1337 + rand.Int63())
+	packetNumber := protocol.PacketNumber(1)
+
+	ph := quic.PublicHeader{
+		ConnectionID:    connectionID,
+		PacketNumber:    packetNumber,
+		PacketNumberLen: protocol.PacketNumberLen2,
+		VersionFlag:     true,
+		VersionNumber:   protocol.Version34,
+	}
+
+	raw := make([]byte, 0, protocol.MaxPacketSize)
+	buffer := bytes.NewBuffer(raw)
+
+	err = ph.Write(buffer, protocol.Version34, protocol.PerspectiveClient)
+	if err != nil {
+		panic(err)
+	}
+	payloadStartIndex := buffer.Len()
+
+	raw = raw[0:buffer.Len()]
+	aead := crypto.NullAEAD{}
+	aead.Seal(raw[payloadStartIndex:payloadStartIndex], raw[payloadStartIndex:], packetNumber, raw[:payloadStartIndex])
+	raw = raw[0 : buffer.Len()+12]
+
+	conn.Write(raw)
+
+	for {
+		data := make([]byte, 1500)
+		n, _, err := conn.ReadFromUDP(data)
+		if err != nil {
+			panic(err)
+		}
+		data = data[:n]
+		fmt.Printf("Response length: %d\n", n)
+		fmt.Println(data)
+	}
+}