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example_traffic.go
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example_traffic.go
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package main
//https://fossies.org/linux/quic-go-no-crypto/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"
)
const addr = "localhost:4242"
const message = "foobar"
// 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() {
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 {
listener, err := quic.ListenAddr(addr, generateTLSConfig(), generateQUICConfig())
if err != nil {
return err
}
defer listener.Close()
conn, err := listener.Accept(context.Background())
if err != nil {
return err
}
stream, err := conn.AcceptStream(context.Background())
if err != nil {
panic(err)
}
defer stream.Close()
// Echo through the loggingWriter
_, err = io.Copy(loggingWriter{stream}, stream)
return err
}
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, "")
stream, err := conn.OpenStreamSync(context.Background())
if err != nil {
return err
}
defer stream.Close()
for i := 0; i < 3; i++ {
fmt.Printf("Client: Sending '%s%d'\n", message, i)
_, err = stream.Write([]byte(message + fmt.Sprintf("%d", i)))
if err != nil {
return err
}
buf := make([]byte, len(message)+1)
_, err = io.ReadFull(stream, buf)
if err != nil {
return err
}
fmt.Printf("Client: Got '%s'\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", 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{}
}