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example.go
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example.go
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package main
// https://fossies.org/linux/quic-go/example/echo/echo.go
// if error:
// sudo sysctl -w net.core.rmem_max=2500000
// sudo sysctl -w net.core.wmem_max=2500000
import (
"context"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"io"
"log"
"math/big"
"os"
"github.com/danielpfeifer02/quic-go-prio-packs"
"github.com/danielpfeifer02/quic-go-prio-packs/crypto_turnoff"
"github.com/danielpfeifer02/quic-go-prio-packs/packet_setting"
"github.com/danielpfeifer02/quic-go-prio-packs/priority_setting"
"github.com/danielpfeifer02/quic-go-prio-packs/qlog"
)
const addr = "localhost:4242"
const message = "foobar"
const NUM_MESSAGES = 3
var counter int = 0
var liste = make([]int, 0)
// We start a server echoing data on the first stream the client opens,
// then connect with a client, send the message, and wait for its receipt.
func main() {
os.Remove("tls.keylog")
go func() { log.Fatal(echoServer()) }()
err := clientMain()
if err != nil {
panic(err)
}
}
// Start a server that echos all data on the first stream opened by the client
func echoServer() error {
crypto_turnoff.CRYPTO_TURNED_OFF = false
packet_setting.ALLOW_SETTING_PN = true
packet_setting.ConnectionInitiationBPFHandler = initiationBPFHandler
packet_setting.ConnectionRetirementBPFHandler = retirementBPFHandler
packet_setting.PacketNumberIncrementBPFHandler = packetNumberBPFHanlder
packet_setting.ConnectionUpdateBPFHandler = updateBPFHandler
packet_setting.AckTranslationBPFHandler = ackHandler
packet_setting.PRINT_PACKET_RECEIVING_INFO = true
listener, err := quic.ListenAddr(addr, generateTLSConfig(), generateQUICConfig())
if err != nil {
panic(err)
}
defer listener.Close()
// Accept the incoming connection from the client
conn, err := listener.Accept(context.Background())
if err != nil {
panic(err)
}
stream, err := conn.AcceptStream(context.Background())
if err != nil {
panic(err)
}
defer stream.Close()
pn_multiplier := 0x42
for i := 1; i <= NUM_MESSAGES; i++ {
buf := make([]byte, len(message)+1)
_, err = io.ReadFull(stream, buf)
if err != nil {
panic(err)
}
fmt.Printf(" >>Server: Got '%s'\n >>Server: Echoing on same stream\n", string(buf))
_, err = stream.Write(buf)
if err != nil {
panic(err)
}
conn.SetPacketNumber(int64(i * pn_multiplier))
conn.SetHighestSent(int64(i * pn_multiplier))
}
connid := conn.GetDestConnID(stream)
fmt.Println("Connection ID: ", connid.String())
return nil
}
func ackHandler(pn int64, conn packet_setting.QuicConnection) (int64, error) {
fmt.Println("Packet Number changed to", pn, "by (", conn.(quic.Connection).RemoteAddr().String(), ",", conn.(quic.Connection).LocalAddr().String(), ")")
return pn, nil
}
func updateBPFHandler(id []byte, l uint8, conn packet_setting.QuicConnection) {
fmt.Println("Update BPF Handler called")
}
func initiationBPFHandler(id []byte, l uint8, conn packet_setting.QuicConnection) {
qconn := conn.(quic.Connection)
fmt.Println("create id with length: ", len(id), "from", qconn.RemoteAddr().String())
// fmt.Println("Initiation BPF Handler called")
// liste = append(liste, counter)
// fmt.Printf("Adding %d to the list\n", counter)
// counter++
}
func retirementBPFHandler(id []byte, l uint8, conn packet_setting.QuicConnection) {
qconn := conn.(quic.Connection)
fmt.Println("retire id with length: ", len(id), "from", qconn.RemoteAddr().String())
// fmt.Println("Retirement BPF Handler called")
// fmt.Printf("Removing %d from the list\n", liste[0])
// liste = liste[1:]
}
func packetNumberBPFHanlder(pn int64, conn packet_setting.QuicConnection) {
// TODO: pn 0 seems to be used multiple times in the beginning?
fmt.Println("Packet Number changed to", pn, "by (", conn.(quic.Connection).RemoteAddr().String(), ",", conn.(quic.Connection).LocalAddr().String(), ")")
}
func clientMain() error {
tlsConf := &tls.Config{
InsecureSkipVerify: true,
NextProtos: []string{"quic-echo-example"},
}
conn, err := quic.DialAddr(context.Background(), addr, tlsConf, generateQUICConfig())
if err != nil {
return err
}
defer conn.CloseWithError(0, "")
// Open a new stream
stream_prio, err := conn.OpenStreamSyncWithPriority(context.Background(), priority_setting.HighPriority)
if err != nil {
return err
}
defer stream_prio.Close()
for i := 1; i <= NUM_MESSAGES; i++ {
fmt.Printf(" >>Client: Sending '%s%d'\n", message, i)
_, err = stream_prio.Write([]byte(message + fmt.Sprintf("%d", i)))
if err != nil {
return err
}
buf := make([]byte, len(message)+1)
_, err = io.ReadFull(stream_prio, buf)
if err != nil {
return err
}
fmt.Printf(" >>Client: Got '%s'\n\n", buf)
}
return nil
}
// A wrapper for io.Writer that also logs the message.
type loggingWriter struct{ io.Writer }
func (w loggingWriter) Write(b []byte) (int, error) {
fmt.Printf(" >>Server: Got '%s'\n >>Server: Echoing on same stream\n", string(b))
return w.Writer.Write(b)
}
// Setup a bare-bones TLS config for the server
func generateTLSConfig() *tls.Config {
key, err := rsa.GenerateKey(rand.Reader, 1024)
if err != nil {
panic(err)
}
template := x509.Certificate{SerialNumber: big.NewInt(1)}
certDER, err := x509.CreateCertificate(rand.Reader, &template, &template, &key.PublicKey, key)
if err != nil {
panic(err)
}
keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)})
certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
tlsCert, err := tls.X509KeyPair(certPEM, keyPEM)
if err != nil {
panic(err)
}
// Create a KeyLogWriter
keyLogFile, err := os.OpenFile("tls.keylog", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
panic(err)
}
// defer keyLogFile.Close() // TODO why not close?
return &tls.Config{
Certificates: []tls.Certificate{tlsCert},
NextProtos: []string{"quic-echo-example"},
KeyLogWriter: keyLogFile,
CipherSuites: []uint16{tls.TLS_CHACHA20_POLY1305_SHA256},
}
}
func generateQUICConfig() *quic.Config {
return &quic.Config{
Tracer: qlog.DefaultTracer,
}
}