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//
// Copyright (c) 2025 Mohammad Nejati
//
// 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)
//
// Official repository: https://github.com/boostorg/beast
//
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
#include <boost/beast.hpp>
#include <boost/beast/ssl.hpp>
#include <iostream>
#if defined(BOOST_ASIO_HAS_CO_AWAIT)
namespace beast = boost::beast;
namespace http = beast::http;
namespace net = boost::asio;
namespace ssl = net::ssl;
void
print_exception(std::exception_ptr eptr)
{
if(eptr)
{
try
{
std::rethrow_exception(eptr);
}
catch(std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
}
net::awaitable<void>
handle_session(ssl::stream<net::ip::tcp::socket> stream)
{
// Perform the SSL handshake
co_await stream.async_handshake(ssl::stream_base::server);
// Read and discard a request
beast::flat_buffer buf;
http::request<http::empty_body> req;
co_await http::async_read(stream, buf, req);
// Write the response
http::response<http::string_body> res;
res.body() = "Hello!";
co_await http::async_write(stream, res);
// Gracefully shutdown the SSL stream
auto [ec] = co_await stream.async_shutdown(net::as_tuple);
if(ec && ec != ssl::error::stream_truncated)
throw boost::system::system_error(ec);
}
net::awaitable<void>
acceptor(ssl::context& ctx)
{
auto executor = co_await net::this_coro::executor;
net::ip::tcp::endpoint endpoint{ {}, 8080 };
net::ip::tcp::acceptor acceptor{ executor, endpoint };
for(;;)
{
net::co_spawn(
executor,
handle_session({ co_await acceptor.async_accept(), ctx }),
print_exception);
}
}
int
main()
{
try
{
// The io_context is required for all I/O
net::io_context ioc;
// The SSL context is required, and holds certificates,
// configurations and session related data
ssl::context ctx{ ssl::context::sslv23 };
// https://docs.openssl.org/3.4/man3/SSL_CTX_set_options/
ctx.set_options(
ssl::context::no_sslv2 | ssl::context::default_workarounds |
ssl::context::single_dh_use);
// Comment this line to disable client certificate request.
ctx.set_verify_mode(
ssl::verify_peer | ssl::verify_fail_if_no_peer_cert);
// The client's certificate will be verified against this
// certificate authority.
ctx.load_verify_file("ca.crt");
// In a real application, the passphrase would be read from
// a secure place, such as a key vault.
ctx.set_password_callback([](auto, auto) { return "123456"; });
// Server certificate and private key.
ctx.use_certificate_chain_file("server.crt");
ctx.use_private_key_file("server.key", ssl::context::pem);
// DH parameters for DHE-based cipher suites
ctx.use_tmp_dh_file("dh4096.pem");
net::co_spawn(ioc, acceptor(ctx), print_exception);
ioc.run();
}
catch(std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
#else
int
main(int, char*[])
{
std::printf("awaitables require C++20\n");
return EXIT_FAILURE;
}
#endif
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