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server.go
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server.go
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package main
import (
"context"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"flag"
"io"
"log"
"math/big"
quic "github.com/lucas-clemente/quic-go"
)
func main() {
hostName := flag.String("hostname", "localhost", "hostname/ip of the server")
portNum := flag.String("port", "4242", "port number of the server")
flag.Parse()
addr := *hostName + ":" + *portNum
log.Println("Server running @", addr)
listener, err := quic.ListenAddr(addr, generateTLSConfig(), nil)
if err != nil {
panic(err)
}
sess, err := listener.Accept(context.Background())
if err != nil {
panic(err)
}
for {
stream, err := sess.AcceptStream(context.Background())
if err != nil {
panic(err)
}
// Echo through the loggingWriter
_, err = io.Copy(loggingWriter{stream}, stream)
}
}
// A wrapper for io.Writer that also logs the message.
type loggingWriter struct{ io.Writer }
func (w loggingWriter) Write(b []byte) (int, error) {
msg := string(b)
log.Printf("Server: Got '%s'\n", msg)
log.Printf("Server: Sending '%s", msg)
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)
}
return &tls.Config{
Certificates: []tls.Certificate{tlsCert},
NextProtos: []string{"quic-echo"},
}
}