server.cpp
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//
// server.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <cstdlib>
#include <iostream>
#include <boost/bind/bind.hpp>
#include "asio.hpp"
#include "asio/ssl.hpp"
typedef asio::ssl::stream<asio::ip::tcp::socket> ssl_socket;
class session
{
public:
session(asio::io_context& io_context,
asio::ssl::context& context)
: socket_(io_context, context)
{
}
ssl_socket::lowest_layer_type& socket()
{
return socket_.lowest_layer();
}
void start()
{
socket_.async_handshake(asio::ssl::stream_base::server,
boost::bind(&session::handle_handshake, this,
asio::placeholders::error));
}
void handle_handshake(const asio::error_code& error)
{
if (!error)
{
socket_.async_read_some(asio::buffer(data_, max_length),
boost::bind(&session::handle_read, this,
asio::placeholders::error,
asio::placeholders::bytes_transferred));
}
else
{
delete this;
}
}
void handle_read(const asio::error_code& error,
size_t bytes_transferred)
{
if (!error)
{
asio::async_write(socket_,
asio::buffer(data_, bytes_transferred),
boost::bind(&session::handle_write, this,
asio::placeholders::error));
}
else
{
delete this;
}
}
void handle_write(const asio::error_code& error)
{
if (!error)
{
socket_.async_read_some(asio::buffer(data_, max_length),
boost::bind(&session::handle_read, this,
asio::placeholders::error,
asio::placeholders::bytes_transferred));
}
else
{
delete this;
}
}
private:
ssl_socket socket_;
enum { max_length = 1024 };
char data_[max_length];
};
class server
{
public:
server(asio::io_context& io_context, unsigned short port)
: io_context_(io_context),
acceptor_(io_context,
asio::ip::tcp::endpoint(asio::ip::tcp::v4(), port)),
context_(asio::ssl::context::sslv23)
{
context_.set_options(
asio::ssl::context::default_workarounds
| asio::ssl::context::no_sslv2
| asio::ssl::context::single_dh_use);
context_.set_password_callback(boost::bind(&server::get_password, this));
context_.use_certificate_chain_file("server.pem");
context_.use_private_key_file("server.pem", asio::ssl::context::pem);
context_.use_tmp_dh_file("dh2048.pem");
start_accept();
}
std::string get_password() const
{
return "test";
}
void start_accept()
{
session* new_session = new session(io_context_, context_);
acceptor_.async_accept(new_session->socket(),
boost::bind(&server::handle_accept, this, new_session,
asio::placeholders::error));
}
void handle_accept(session* new_session,
const asio::error_code& error)
{
if (!error)
{
new_session->start();
}
else
{
delete new_session;
}
start_accept();
}
private:
asio::io_context& io_context_;
asio::ip::tcp::acceptor acceptor_;
asio::ssl::context context_;
};
int main(int argc, char* argv[])
{
try
{
if (argc != 2)
{
std::cerr << "Usage: server <port>\n";
return 1;
}
asio::io_context io_context;
using namespace std; // For atoi.
server s(io_context, atoi(argv[1]));
io_context.run();
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}
return 0;
}