Secure TLS connection using Boost.Asio and OpenSSL for Windows

#include 
#include 
#include 
#include 
#define SSL_R_SHORT_READ 219
#include "ssl/ssl_locl.h"
#include 
typedef boost::asio::ssl::stream ssl_socket;
class session
{
public:
	session(boost::asio::io_service& io_service,
		boost::asio::ssl::context& context)
		: socket_(io_service, context)
	{
	}
	ssl_socket::lowest_layer_type& socket()
	{
		return socket_.lowest_layer();
	}
	void start()
	{
		socket_.async_handshake(boost::asio::ssl::stream_base::server,
			boost::bind(&session::handle_handshake, this,
			boost::asio::placeholders::error));
	}
	void handle_handshake(const boost::system::error_code& error)
	{
		if (!error)
		{
			socket_.async_read_some(boost::asio::buffer(data_, max_length),
				boost::bind(&session::handle_read, this,
				boost::asio::placeholders::error,
				boost::asio::placeholders::bytes_transferred));
		}
		else
		{
			delete this;
		}
	}
	void handle_read(const boost::system::error_code& error,
		size_t bytes_transferred)
	{
		if (!error)
		{
			boost::asio::async_write(socket_,
				boost::asio::buffer(data_, bytes_transferred),
				boost::bind(&session::handle_write, this,
				boost::asio::placeholders::error));
		}
		else
		{
			delete this;
		}
	}
	void handle_write(const boost::system::error_code& error)
	{
		if (!error)
		{
			socket_.async_read_some(boost::asio::buffer(data_, max_length),
				boost::bind(&session::handle_read, this,
				boost::asio::placeholders::error,
				boost::asio::placeholders::bytes_transferred));
		}
		else
		{
			delete this;
		}
	}
private:
	ssl_socket socket_;
	enum { max_length = 1024 };
	char data_[max_length];
};
class server
{
public:
	server(boost::asio::io_service& io_service, unsigned short port)
		: io_service_(io_service),
		acceptor_(io_service,
		boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port)),
		context_(boost::asio::ssl::context::sslv23)
	{
		context_.set_options(
			boost::asio::ssl::context::default_workarounds
			| boost::asio::ssl::context::no_sslv2
			| boost::asio::ssl::context::single_dh_use);
		context_.set_password_callback(boost::bind(&server::get_password, this));
		context_.use_certificate_chain_file("user.crt");
		context_.use_private_key_file("user.key", boost::asio::ssl::context::pem);
		context_.use_tmp_dh_file("dh2048.pem");
		start_accept();
	}
	std::string get_password() const
	{
		return "";
	}
	void start_accept()
	{
		session* new_session = new session(io_service_, context_);
		acceptor_.async_accept(new_session->socket(),
					boost::bind(&server::handle_accept, this, new_session,
					boost::asio::placeholders::error));
	}
	void handle_accept(session* new_session,
		const boost::system::error_code& error)
	{
		if (!error)
		{
			new_session->start();
		}
		else
		{
			delete new_session;
		}
		start_accept();
	}
private:
	boost::asio::io_service& io_service_;
	boost::asio::ip::tcp::acceptor acceptor_;
	boost::asio::ssl::context context_;
};
int main(int argc, char* argv[])
{
	try
	{
		if (argc != 2)
		{
			std::cerr << "Usage: server \n";
			return 1;
		}
		boost::asio::io_service io_service;
		using namespace std; // For atoi.
		server s(io_service, atoi(argv[1]));
		io_service.run();
	}
	catch (std::exception& e)
	{
		std::cerr << "Exception: " << e.what() << "\n";
	}
	return 0;
}

#include 
#include 
#include 
#include 
#define SSL_R_SHORT_READ 219
#include "ssl/ssl_locl.h"
#include 
enum { max_length = 1024 };
class client
{
public:
	client(boost::asio::io_service& io_service,
			boost::asio::ssl::context& context,
			boost::asio::ip::tcp::resolver::iterator endpoint_iterator)
		: socket_(io_service, context)
	{
		socket_.set_verify_mode(boost::asio::ssl::verify_peer);
		socket_.set_verify_callback(
			boost::bind(&client::verify_certificate, this, _1, _2));
		boost::asio::async_connect(socket_.lowest_layer(), endpoint_iterator,
			boost::bind(&client::handle_connect, this,
			boost::asio::placeholders::error));
	}
	bool verify_certificate(bool preverified,
		boost::asio::ssl::verify_context& ctx)
	{
		// The verify callback can be used to check whether the certificate that is
		// being presented is valid for the peer. For example, RFC 2818 describes
		// the steps involved in doing this for HTTPS. Consult the OpenSSL
		// documentation for more details. Note that the callback is called once
		// for each certificate in the certificate chain, starting from the root
		// certificate authority.
		// In this example we will simply print the certificate's subject name.
		char subject_name[256];
		X509* cert = X509_STORE_CTX_get_current_cert(ctx.native_handle());
		X509_NAME_oneline(X509_get_subject_name(cert), subject_name, 256);
		std::cout << "Verifying " << subject_name << "\n";
		return preverified;
	}
	void handle_connect(const boost::system::error_code& error)
	{
		if (!error)
		{
			socket_.async_handshake(boost::asio::ssl::stream_base::client,
				boost::bind(&client::handle_handshake, this,
				boost::asio::placeholders::error));
		}
		else
		{
			std::cout << "Connect failed: " << error.message() << "\n";
		}
	}
	void handle_handshake(const boost::system::error_code& error)
	{
		if (!error)
		{
			std::cout << "Enter message: ";
			std::cin.getline(request_, max_length);
			size_t request_length = strlen(request_);
			boost::asio::async_write(socket_,
				boost::asio::buffer(request_, request_length),
				boost::bind(&client::handle_write, this,
				boost::asio::placeholders::error,
				boost::asio::placeholders::bytes_transferred));
		}
		else
		{
			std::cout << "Handshake failed: " << error.message() << "\n";
		}
	}
	void handle_write(const boost::system::error_code& error,
		size_t bytes_transferred)
	{
		if (!error)
		{
			boost::asio::async_read(socket_,
				boost::asio::buffer(reply_, bytes_transferred),
				boost::bind(&client::handle_read, this,
				boost::asio::placeholders::error,
				boost::asio::placeholders::bytes_transferred));
		}
		else
		{
			std::cout << "Write failed: " << error.message() << "\n";
		}
	}
	void handle_read(const boost::system::error_code& error,
		size_t bytes_transferred)
	{
		if (!error)
		{
			std::cout << "Reply: ";
			std::cout.write(reply_, bytes_transferred);
			std::cout << "\n";
		}
		else
		{
			std::cout << "Read failed: " << error.message() << "\n";
		}
	}
private:
	boost::asio::ssl::stream socket_;
	char request_[max_length];
	char reply_[max_length];
};
int main(int argc, char* argv[])
{
	try
	{
		if (argc != 3)
		{
			std::cerr << "Usage: client \n";
			return 1;
		}
		boost::asio::io_service io_service;
		boost::asio::ip::tcp::resolver resolver(io_service);
		boost::asio::ip::tcp::resolver::query query(argv[1], argv[2]);
		boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query);
		boost::asio::ssl::context ctx(boost::asio::ssl::context::sslv23);
		ctx.load_verify_file("rootca.crt");
		client c(io_service, ctx, iterator);
		io_service.run();
	}
	catch (std::exception& e)
	{
		std::cerr << "Exception: " << e.what() << "\n";
	}
	return 0;
}