fix: correct read/write handling in CustomWriter

main.go

@@ -10,28 +10,25 @@ import (
 )
 
 func main() {
+	log.SetOutput(os.Stdout)
+	log.SetFlags(log.LstdFlags | log.Lshortfile)
+	
 	sshConfig := &ssh.ServerConfig{
 		NoClientAuth:  true,
 		ServerVersion: "SSH-2.0-TunnlPls-1.0",
-		PasswordCallback: func(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
-			return nil, nil
-		},
 	}
 
-	log.SetOutput(os.Stdout)
-	log.SetFlags(log.LstdFlags | log.Lshortfile)
-
 	privateBytes, err := os.ReadFile(utils.Getenv("ssh_private_key"))
 	if err != nil {
-		log.Fatalf("Failed to load private key : %s", err.Error())
+		log.Fatalf("Failed to load private key: %s", err)
 	}
 
 	private, err := ssh.ParsePrivateKey(privateBytes)
 	if err != nil {
-		log.Fatal("Failed to parse private key")
+		log.Fatalf("Failed to parse private key: %s", err)
 	}
 
 	sshConfig.AddHostKey(private)
-	app := server.NewServer(*sshConfig)
+	app := server.NewServer(sshConfig)
 	app.Start()
 }