Many changes.

client_script.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+echo $PWD
 
 var_file="./var_file"
 
@@ -17,4 +18,4 @@ let var=$var+1
 echo $var ": Hallo Freunde der Sonne" | openssl s_client -connect localhost:8080
 
 
-echo $var > $var_file
+echo $var > $var_file

go.mod

@@ -1,3 +1,5 @@
-module tls_server
+module ws_server
 
 go 1.19
+
+require github.com/gorilla/websocket v1.5.0 // indirect

go.sum

@@ -0,0 +1,2 @@
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=

main.go

@@ -1,9 +1,18 @@
 package main
 
 import (
-	"tls_server/server"
+	"log"
+	"net/http"
+	"ws_server/server"
 )
 
 func main() {
-	server.RunServer()
+	http.HandleFunc("/", server.SocketHandler)
+
+	err := http.ListenAndServe("localhost:8080", nil)
+	if err != nil {
+		log.Println(err)
+	}
+
+	log.Println("We ended")
 }

server/server.go

@@ -1,90 +1,34 @@
 package server
 
 import (
-	"bufio"
-	"crypto/tls"
-	"fmt"
-	"io"
 	"log"
-	"net"
-	"os"
-	"strconv"
+	"net/http"
+
+	"github.com/gorilla/websocket"
 )
 
-const (
-	port     uint = 8080
-	certFile      = "/home/m/.local_ca/localhost.crt"
-	keyFile       = "/home/m/.local_ca/localhost.key"
-)
+var upgrader = websocket.Upgrader{} // use default options
 
-func RunServer() error {
-	tls_cfg, err := configTls()
+func SocketHandler(w http.ResponseWriter, r *http.Request) {
+	conn, err := upgrader.Upgrade(w, r, nil)
 	if err != nil {
-		fmt.Println(err)
-		os.Exit(-1)
-	}
-
-	listener, err := listen(tls_cfg)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(-1)
+		log.Print("Error during connection upgrading:", err)
+		return
 	}
+	defer conn.Close()
 
+	// The event loop
 	for {
-		connection, err := listener.Accept()
+		messageType, message, err := conn.ReadMessage()
 		if err != nil {
-			fmt.Println(err)
-			os.Exit(-1)
+			log.Println("Error during message reading:", err)
+			break
 		}
-
-		go handleConnection(connection)
-	}
-}
-
-func configTls() (*tls.Config, error) {
-	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
-	if err != nil {
-		log.Println("Error while loading x509 key pair")
-		log.Println(err)
-		return nil, err
-	}
-
-	return &tls.Config{Certificates: []tls.Certificate{cert}}, nil
-}
-
-func listen(tls_config *tls.Config) (net.Listener, error) {
-	listeningOnAddr := "localhost:" + strconv.FormatUint(uint64(port), 10)
-
-	listener, err := tls.Listen("tcp", listeningOnAddr, tls_config)
-	if err != nil {
-		return nil, err
-	}
-	fmt.Println("We started to listen on port", port)
-
-	return listener, nil
-}
-
-func handleConnection(connection net.Conn) {
-
-	testReader := *bufio.NewReader(connection)
-
-	for {
-
-		readBuf := make([]byte, 10)
-
-		if n, err := testReader.Read(readBuf); n > 0 {
-			fmt.Printf("Type of connection: %T\n", connection)
-			fmt.Println(n, " bytes read: ", readBuf)
-
-			if n > 0 {
-				switch err {
-				case nil:
-				case io.EOF:
-					fmt.Println(err)
-				default:
-					fmt.Println(err)
-				}
-			}
+		log.Printf("Received: %s", message)
+		err = conn.WriteMessage(messageType, message)
+		if err != nil {
+			log.Println("Error during message writing:", err)
+			break
 		}
 	}
 }

var_file

@@ -1 +1 @@
-11
+16