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/* wolfSSL-TLS-ServerThreaded.cs
*
* Copyright (C) 2006-2025 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
using System;
using System.Runtime.InteropServices;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using wolfSSL.CSharp;
public class wolfSSL_TLS_ServerThread
{
private IntPtr _ctx;
private Socket _fd;
public wolfSSL_TLS_ServerThread(IntPtr ctx, Socket fd)
{
_ctx = ctx;
_fd = fd;
}
private const int kEchoBufSz = 1024;
public void start_client()
{
StringBuilder buff = new StringBuilder(kEchoBufSz);
IntPtr ssl = wolfssl.new_ssl(_ctx);
if (ssl == IntPtr.Zero)
{
Console.WriteLine("Error in creating ssl object");
return;
}
if (wolfssl.set_fd(ssl, _fd) != wolfssl.SUCCESS)
{
/* get and print out the error */
Console.WriteLine(wolfssl.get_error(ssl));
_fd.Close();
wolfssl.free(ssl);
return;
}
Console.WriteLine("Starting TLS handshake");
if (wolfssl.accept(ssl) != wolfssl.SUCCESS)
{
/* get and print out the error */
Console.WriteLine("Failed " + wolfssl.get_error(ssl));
_fd.Close();
wolfssl.free(ssl);
return;
}
/* print out results of TLS/SSL accept */
Console.WriteLine("SSL version is " + wolfssl.get_version(ssl));
Console.WriteLine("SSL cipher suite is " + wolfssl.get_current_cipher(ssl));
/* echo data until error */
while (true)
{
/* read and print out the message then reply */
if (wolfssl.read(ssl, buff, kEchoBufSz-1) < 0)
{
Console.WriteLine("Error in read");
break;
}
Console.WriteLine(buff);
if (wolfssl.write(ssl, buff, buff.Length) != buff.Length)
{
Console.WriteLine("Error in write");
break;
}
}
Console.WriteLine("Closing " + wolfssl.get_error(ssl));
_fd.Close();
wolfssl.free(ssl);
}
}
public class wolfSSL_TLS_ServerThreaded
{
/// <summary>
/// Example of a logging function
/// </summary>
/// <param name="lvl">level of log</param>
/// <param name="msg">message to log</param>
public static void standard_log(int lvl, StringBuilder msg)
{
Console.WriteLine(msg);
}
public static void Main(string[] args)
{
IntPtr ctx;
/* These paths should be changed for use */
string fileCert = wolfssl.setPath("server-cert.pem");
string fileKey = wolfssl.setPath("server-key.pem");
StringBuilder dhparam = new StringBuilder(wolfssl.setPath("dh2048.pem"));
if (fileCert == "" || fileKey == "" || dhparam.Length == 0) {
Console.WriteLine("Platform not supported");
return;
}
/* example of function used for setting logging */
wolfssl.SetLogging(standard_log);
wolfssl.Init();
Console.WriteLine("Calling ctx Init from wolfSSL");
ctx = wolfssl.CTX_new(wolfssl.usev23_server());
if (ctx == IntPtr.Zero)
{
Console.WriteLine("Error in creating ctx structure");
return;
}
Console.WriteLine("Finished init of ctx .... now load in cert and key");
if (!File.Exists(fileCert) || !File.Exists(fileKey))
{
Console.WriteLine("Could not find cert or key file");
wolfssl.CTX_free(ctx);
return;
}
if (!File.Exists(dhparam.ToString())) {
Console.WriteLine("Could not find dh file");
wolfssl.CTX_free(ctx);
return;
}
if (wolfssl.CTX_use_certificate_file(ctx, fileCert, wolfssl.SSL_FILETYPE_PEM) != wolfssl.SUCCESS)
{
Console.WriteLine("Error in setting cert file");
wolfssl.CTX_free(ctx);
return;
}
if (wolfssl.CTX_use_PrivateKey_file(ctx, fileKey, wolfssl.SSL_FILETYPE_PEM) != wolfssl.SUCCESS)
{
Console.WriteLine("Error in setting key file");
wolfssl.CTX_free(ctx);
return;
}
StringBuilder ciphers = new StringBuilder(new String(' ', 4096));
wolfssl.get_ciphers(ciphers, 4096);
Console.WriteLine("Ciphers : " + ciphers.ToString());
short minDhKey = 128;
wolfssl.CTX_SetMinDhKey_Sz(ctx, minDhKey);
wolfssl.CTX_SetTmpDH_file(ctx, dhparam, wolfssl.SSL_FILETYPE_PEM);
/* set up TCP socket */
IPAddress ip = IPAddress.Parse("0.0.0.0"); /* bind to any */
TcpListener tcp = new TcpListener(ip, 11111);
tcp.Start();
Console.WriteLine("Started TCP and waiting for a connection");
while (true) {
try
{
Socket fd = tcp.AcceptSocket();
Console.WriteLine("Got client connection");
/* Spin up thread for client */
wolfSSL_TLS_ServerThread thread = new wolfSSL_TLS_ServerThread(ctx, fd);
Thread thr = new Thread(new ThreadStart(thread.start_client));
thr.Start();
}
catch(Exception ex)
{
Console.WriteLine("Server Exception " + ex.ToString());
break;
}
}
tcp.Stop();
wolfssl.CTX_free(ctx);
wolfssl.Cleanup();
}
}
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