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 <functional>
#include <iostream>
#include "asio.hpp"
#include "asio/ssl.hpp"
using asio::ip::tcp;
class session : public std::enable_shared_from_this<session>
{
public:
session(asio::ssl::stream<tcp::socket> socket)
: socket_(std::move(socket))
{
}
void start()
{
do_handshake();
}
private:
void do_handshake()
{
auto self(shared_from_this());
socket_.async_handshake(asio::ssl::stream_base::server,
[this, self](const std::error_code& error)
{
if (!error)
{
do_read();
}
});
}
void do_read()
{
auto self(shared_from_this());
socket_.async_read_some(asio::buffer(data_),
[this, self](const std::error_code& ec, std::size_t length)
{
if (!ec)
{
do_write(length);
}
});
}
void do_write(std::size_t length)
{
auto self(shared_from_this());
asio::async_write(socket_, asio::buffer(data_, length),
[this, self](const std::error_code& ec,
std::size_t /*length*/)
{
if (!ec)
{
do_read();
}
});
}
asio::ssl::stream<tcp::socket> socket_;
char data_[1024];
};
class server
{
public:
server(asio::io_context& io_context, unsigned short port)
: acceptor_(io_context, tcp::endpoint(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(std::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");
do_accept();
}
private:
std::string get_password() const
{
return "test";
}
void do_accept()
{
acceptor_.async_accept(
[this](const std::error_code& error, tcp::socket socket)
{
if (!error)
{
std::make_shared<session>(
asio::ssl::stream<tcp::socket>(
std::move(socket), context_))->start();
}
do_accept();
});
}
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;
}