697 lines
19 KiB
C++
697 lines
19 KiB
C++
//
|
|
// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail 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)
|
|
//
|
|
// Official repository: https://github.com/boostorg/beast
|
|
//
|
|
|
|
//------------------------------------------------------------------------------
|
|
//
|
|
// Example: HTTP flex server (plain and SSL), asynchronous
|
|
//
|
|
//------------------------------------------------------------------------------
|
|
|
|
#include "example/common/detect_ssl.hpp"
|
|
#include "example/common/server_certificate.hpp"
|
|
|
|
#include <boost/beast/core.hpp>
|
|
#include <boost/beast/http.hpp>
|
|
#include <boost/beast/version.hpp>
|
|
#include <boost/asio/bind_executor.hpp>
|
|
#include <boost/asio/ip/tcp.hpp>
|
|
#include <boost/asio/ssl/stream.hpp>
|
|
#include <boost/asio/strand.hpp>
|
|
#include <boost/config.hpp>
|
|
#include <algorithm>
|
|
#include <cstdlib>
|
|
#include <functional>
|
|
#include <iostream>
|
|
#include <memory>
|
|
#include <string>
|
|
#include <thread>
|
|
|
|
using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
|
|
namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
|
|
namespace http = boost::beast::http; // from <boost/beast/http.hpp>
|
|
|
|
// Return a reasonable mime type based on the extension of a file.
|
|
boost::beast::string_view
|
|
mime_type(boost::beast::string_view path)
|
|
{
|
|
using boost::beast::iequals;
|
|
auto const ext = [&path]
|
|
{
|
|
auto const pos = path.rfind(".");
|
|
if(pos == boost::beast::string_view::npos)
|
|
return boost::beast::string_view{};
|
|
return path.substr(pos);
|
|
}();
|
|
if(iequals(ext, ".htm")) return "text/html";
|
|
if(iequals(ext, ".html")) return "text/html";
|
|
if(iequals(ext, ".php")) return "text/html";
|
|
if(iequals(ext, ".css")) return "text/css";
|
|
if(iequals(ext, ".txt")) return "text/plain";
|
|
if(iequals(ext, ".js")) return "application/javascript";
|
|
if(iequals(ext, ".json")) return "application/json";
|
|
if(iequals(ext, ".xml")) return "application/xml";
|
|
if(iequals(ext, ".swf")) return "application/x-shockwave-flash";
|
|
if(iequals(ext, ".flv")) return "video/x-flv";
|
|
if(iequals(ext, ".png")) return "image/png";
|
|
if(iequals(ext, ".jpe")) return "image/jpeg";
|
|
if(iequals(ext, ".jpeg")) return "image/jpeg";
|
|
if(iequals(ext, ".jpg")) return "image/jpeg";
|
|
if(iequals(ext, ".gif")) return "image/gif";
|
|
if(iequals(ext, ".bmp")) return "image/bmp";
|
|
if(iequals(ext, ".ico")) return "image/vnd.microsoft.icon";
|
|
if(iequals(ext, ".tiff")) return "image/tiff";
|
|
if(iequals(ext, ".tif")) return "image/tiff";
|
|
if(iequals(ext, ".svg")) return "image/svg+xml";
|
|
if(iequals(ext, ".svgz")) return "image/svg+xml";
|
|
return "application/text";
|
|
}
|
|
|
|
// Append an HTTP rel-path to a local filesystem path.
|
|
// The returned path is normalized for the platform.
|
|
std::string
|
|
path_cat(
|
|
boost::beast::string_view base,
|
|
boost::beast::string_view path)
|
|
{
|
|
if(base.empty())
|
|
return path.to_string();
|
|
std::string result = base.to_string();
|
|
#if BOOST_MSVC
|
|
char constexpr path_separator = '\\';
|
|
if(result.back() == path_separator)
|
|
result.resize(result.size() - 1);
|
|
result.append(path.data(), path.size());
|
|
for(auto& c : result)
|
|
if(c == '/')
|
|
c = path_separator;
|
|
#else
|
|
char constexpr path_separator = '/';
|
|
if(result.back() == path_separator)
|
|
result.resize(result.size() - 1);
|
|
result.append(path.data(), path.size());
|
|
#endif
|
|
return result;
|
|
}
|
|
|
|
// This function produces an HTTP response for the given
|
|
// request. The type of the response object depends on the
|
|
// contents of the request, so the interface requires the
|
|
// caller to pass a generic lambda for receiving the response.
|
|
template<
|
|
class Body, class Allocator,
|
|
class Send>
|
|
void
|
|
handle_request(
|
|
boost::beast::string_view doc_root,
|
|
http::request<Body, http::basic_fields<Allocator>>&& req,
|
|
Send&& send)
|
|
{
|
|
// Returns a bad request response
|
|
auto const bad_request =
|
|
[&req](boost::beast::string_view why)
|
|
{
|
|
http::response<http::string_body> res{http::status::bad_request, req.version()};
|
|
res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
|
|
res.set(http::field::content_type, "text/html");
|
|
res.keep_alive(req.keep_alive());
|
|
res.body() = why.to_string();
|
|
res.prepare_payload();
|
|
return res;
|
|
};
|
|
|
|
// Returns a not found response
|
|
auto const not_found =
|
|
[&req](boost::beast::string_view target)
|
|
{
|
|
http::response<http::string_body> res{http::status::not_found, req.version()};
|
|
res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
|
|
res.set(http::field::content_type, "text/html");
|
|
res.keep_alive(req.keep_alive());
|
|
res.body() = "The resource '" + target.to_string() + "' was not found.";
|
|
res.prepare_payload();
|
|
return res;
|
|
};
|
|
|
|
// Returns a server error response
|
|
auto const server_error =
|
|
[&req](boost::beast::string_view what)
|
|
{
|
|
http::response<http::string_body> res{http::status::internal_server_error, req.version()};
|
|
res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
|
|
res.set(http::field::content_type, "text/html");
|
|
res.keep_alive(req.keep_alive());
|
|
res.body() = "An error occurred: '" + what.to_string() + "'";
|
|
res.prepare_payload();
|
|
return res;
|
|
};
|
|
|
|
// Make sure we can handle the method
|
|
if( req.method() != http::verb::get &&
|
|
req.method() != http::verb::head)
|
|
return send(bad_request("Unknown HTTP-method"));
|
|
|
|
// Request path must be absolute and not contain "..".
|
|
if( req.target().empty() ||
|
|
req.target()[0] != '/' ||
|
|
req.target().find("..") != boost::beast::string_view::npos)
|
|
return send(bad_request("Illegal request-target"));
|
|
|
|
// Build the path to the requested file
|
|
std::string path = path_cat(doc_root, req.target());
|
|
if(req.target().back() == '/')
|
|
path.append("index.html");
|
|
|
|
// Attempt to open the file
|
|
boost::beast::error_code ec;
|
|
http::file_body::value_type body;
|
|
body.open(path.c_str(), boost::beast::file_mode::scan, ec);
|
|
|
|
// Handle the case where the file doesn't exist
|
|
if(ec == boost::system::errc::no_such_file_or_directory)
|
|
return send(not_found(req.target()));
|
|
|
|
// Handle an unknown error
|
|
if(ec)
|
|
return send(server_error(ec.message()));
|
|
|
|
// Respond to HEAD request
|
|
if(req.method() == http::verb::head)
|
|
{
|
|
http::response<http::empty_body> res{http::status::ok, req.version()};
|
|
res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
|
|
res.set(http::field::content_type, mime_type(path));
|
|
res.content_length(body.size());
|
|
res.keep_alive(req.keep_alive());
|
|
return send(std::move(res));
|
|
}
|
|
|
|
// Respond to GET request
|
|
http::response<http::file_body> res{
|
|
std::piecewise_construct,
|
|
std::make_tuple(std::move(body)),
|
|
std::make_tuple(http::status::ok, req.version())};
|
|
res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
|
|
res.set(http::field::content_type, mime_type(path));
|
|
res.content_length(body.size());
|
|
res.keep_alive(req.keep_alive());
|
|
return send(std::move(res));
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
// Report a failure
|
|
void
|
|
fail(boost::system::error_code ec, char const* what)
|
|
{
|
|
std::cerr << what << ": " << ec.message() << "\n";
|
|
}
|
|
|
|
// Handles an HTTP server connection.
|
|
// This uses the Curiously Recurring Template Pattern so that
|
|
// the same code works with both SSL streams and regular sockets.
|
|
template<class Derived>
|
|
class session
|
|
{
|
|
// Access the derived class, this is part of
|
|
// the Curiously Recurring Template Pattern idiom.
|
|
Derived&
|
|
derived()
|
|
{
|
|
return static_cast<Derived&>(*this);
|
|
}
|
|
|
|
// This is the C++11 equivalent of a generic lambda.
|
|
// The function object is used to send an HTTP message.
|
|
struct send_lambda
|
|
{
|
|
session& self_;
|
|
|
|
explicit
|
|
send_lambda(session& self)
|
|
: self_(self)
|
|
{
|
|
}
|
|
|
|
template<bool isRequest, class Body, class Fields>
|
|
void
|
|
operator()(http::message<isRequest, Body, Fields>&& msg) const
|
|
{
|
|
// The lifetime of the message has to extend
|
|
// for the duration of the async operation so
|
|
// we use a shared_ptr to manage it.
|
|
auto sp = std::make_shared<
|
|
http::message<isRequest, Body, Fields>>(std::move(msg));
|
|
|
|
// Store a type-erased version of the shared
|
|
// pointer in the class to keep it alive.
|
|
self_.res_ = sp;
|
|
|
|
// Write the response
|
|
http::async_write(
|
|
self_.derived().stream(),
|
|
*sp,
|
|
boost::asio::bind_executor(
|
|
self_.strand_,
|
|
std::bind(
|
|
&session::on_write,
|
|
self_.derived().shared_from_this(),
|
|
std::placeholders::_1,
|
|
std::placeholders::_2,
|
|
sp->need_eof())));
|
|
}
|
|
};
|
|
|
|
std::string const& doc_root_;
|
|
http::request<http::string_body> req_;
|
|
std::shared_ptr<void> res_;
|
|
send_lambda lambda_;
|
|
|
|
protected:
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
boost::beast::flat_buffer buffer_;
|
|
|
|
public:
|
|
// Take ownership of the buffer
|
|
explicit
|
|
session(
|
|
boost::asio::io_context& ioc,
|
|
boost::beast::flat_buffer buffer,
|
|
std::string const& doc_root)
|
|
: doc_root_(doc_root)
|
|
, lambda_(*this)
|
|
, strand_(ioc.get_executor())
|
|
, buffer_(std::move(buffer))
|
|
{
|
|
}
|
|
|
|
void
|
|
do_read()
|
|
{
|
|
// Read a request
|
|
http::async_read(
|
|
derived().stream(),
|
|
buffer_,
|
|
req_,
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&session::on_read,
|
|
derived().shared_from_this(),
|
|
std::placeholders::_1,
|
|
std::placeholders::_2)));
|
|
}
|
|
|
|
void
|
|
on_read(
|
|
boost::system::error_code ec,
|
|
std::size_t bytes_transferred)
|
|
{
|
|
boost::ignore_unused(bytes_transferred);
|
|
|
|
// This means they closed the connection
|
|
if(ec == http::error::end_of_stream)
|
|
return derived().do_eof();
|
|
|
|
if(ec)
|
|
return fail(ec, "read");
|
|
|
|
// Send the response
|
|
handle_request(doc_root_, std::move(req_), lambda_);
|
|
}
|
|
|
|
void
|
|
on_write(
|
|
boost::system::error_code ec,
|
|
std::size_t bytes_transferred,
|
|
bool close)
|
|
{
|
|
boost::ignore_unused(bytes_transferred);
|
|
|
|
if(ec)
|
|
return fail(ec, "write");
|
|
|
|
if(close)
|
|
{
|
|
// This means we should close the connection, usually because
|
|
// the response indicated the "Connection: close" semantic.
|
|
return derived().do_eof();
|
|
}
|
|
|
|
// We're done with the response so delete it
|
|
res_ = nullptr;
|
|
|
|
// Read another request
|
|
do_read();
|
|
}
|
|
};
|
|
|
|
// Handles a plain HTTP connection
|
|
class plain_session
|
|
: public session<plain_session>
|
|
, public std::enable_shared_from_this<plain_session>
|
|
{
|
|
tcp::socket socket_;
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
|
|
public:
|
|
// Create the session
|
|
plain_session(
|
|
tcp::socket socket,
|
|
boost::beast::flat_buffer buffer,
|
|
std::string const& doc_root)
|
|
: session<plain_session>(
|
|
socket.get_executor().context(),
|
|
std::move(buffer),
|
|
doc_root)
|
|
, socket_(std::move(socket))
|
|
, strand_(socket_.get_executor())
|
|
{
|
|
}
|
|
|
|
// Called by the base class
|
|
tcp::socket&
|
|
stream()
|
|
{
|
|
return socket_;
|
|
}
|
|
|
|
// Start the asynchronous operation
|
|
void
|
|
run()
|
|
{
|
|
do_read();
|
|
}
|
|
|
|
void
|
|
do_eof()
|
|
{
|
|
// Send a TCP shutdown
|
|
boost::system::error_code ec;
|
|
socket_.shutdown(tcp::socket::shutdown_send, ec);
|
|
|
|
// At this point the connection is closed gracefully
|
|
}
|
|
};
|
|
|
|
// Handles an SSL HTTP connection
|
|
class ssl_session
|
|
: public session<ssl_session>
|
|
, public std::enable_shared_from_this<ssl_session>
|
|
{
|
|
tcp::socket socket_;
|
|
ssl::stream<tcp::socket&> stream_;
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
|
|
public:
|
|
// Create the session
|
|
ssl_session(
|
|
tcp::socket socket,
|
|
ssl::context& ctx,
|
|
boost::beast::flat_buffer buffer,
|
|
std::string const& doc_root)
|
|
: session<ssl_session>(
|
|
socket.get_executor().context(),
|
|
std::move(buffer),
|
|
doc_root)
|
|
, socket_(std::move(socket))
|
|
, stream_(socket_, ctx)
|
|
, strand_(stream_.get_executor())
|
|
{
|
|
}
|
|
|
|
// Called by the base class
|
|
ssl::stream<tcp::socket&>&
|
|
stream()
|
|
{
|
|
return stream_;
|
|
}
|
|
|
|
// Start the asynchronous operation
|
|
void
|
|
run()
|
|
{
|
|
// Perform the SSL handshake
|
|
// Note, this is the buffered version of the handshake.
|
|
stream_.async_handshake(
|
|
ssl::stream_base::server,
|
|
buffer_.data(),
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&ssl_session::on_handshake,
|
|
shared_from_this(),
|
|
std::placeholders::_1,
|
|
std::placeholders::_2)));
|
|
}
|
|
void
|
|
on_handshake(
|
|
boost::system::error_code ec,
|
|
std::size_t bytes_used)
|
|
{
|
|
if(ec)
|
|
return fail(ec, "handshake");
|
|
|
|
// Consume the portion of the buffer used by the handshake
|
|
buffer_.consume(bytes_used);
|
|
|
|
do_read();
|
|
}
|
|
|
|
void
|
|
do_eof()
|
|
{
|
|
// Perform the SSL shutdown
|
|
stream_.async_shutdown(
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&ssl_session::on_shutdown,
|
|
shared_from_this(),
|
|
std::placeholders::_1)));
|
|
}
|
|
|
|
void
|
|
on_shutdown(boost::system::error_code ec)
|
|
{
|
|
if(ec)
|
|
return fail(ec, "shutdown");
|
|
|
|
// At this point the connection is closed gracefully
|
|
}
|
|
};
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
// Detects SSL handshakes
|
|
class detect_session : public std::enable_shared_from_this<detect_session>
|
|
{
|
|
tcp::socket socket_;
|
|
ssl::context& ctx_;
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
std::string const& doc_root_;
|
|
boost::beast::flat_buffer buffer_;
|
|
|
|
public:
|
|
explicit
|
|
detect_session(
|
|
tcp::socket socket,
|
|
ssl::context& ctx,
|
|
std::string const& doc_root)
|
|
: socket_(std::move(socket))
|
|
, ctx_(ctx)
|
|
, strand_(socket_.get_executor())
|
|
, doc_root_(doc_root)
|
|
{
|
|
}
|
|
|
|
// Launch the detector
|
|
void
|
|
run()
|
|
{
|
|
async_detect_ssl(
|
|
socket_,
|
|
buffer_,
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&detect_session::on_detect,
|
|
shared_from_this(),
|
|
std::placeholders::_1,
|
|
std::placeholders::_2)));
|
|
|
|
}
|
|
|
|
void
|
|
on_detect(boost::system::error_code ec, boost::tribool result)
|
|
{
|
|
if(ec)
|
|
return fail(ec, "detect");
|
|
|
|
if(result)
|
|
{
|
|
// Launch SSL session
|
|
std::make_shared<ssl_session>(
|
|
std::move(socket_),
|
|
ctx_,
|
|
std::move(buffer_),
|
|
doc_root_)->run();
|
|
return;
|
|
}
|
|
|
|
// Launch plain session
|
|
std::make_shared<plain_session>(
|
|
std::move(socket_),
|
|
std::move(buffer_),
|
|
doc_root_)->run();
|
|
}
|
|
};
|
|
|
|
// Accepts incoming connections and launches the sessions
|
|
class listener : public std::enable_shared_from_this<listener>
|
|
{
|
|
ssl::context& ctx_;
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
tcp::acceptor acceptor_;
|
|
tcp::socket socket_;
|
|
std::string const& doc_root_;
|
|
|
|
public:
|
|
listener(
|
|
boost::asio::io_context& ioc,
|
|
ssl::context& ctx,
|
|
tcp::endpoint endpoint,
|
|
std::string const& doc_root)
|
|
: ctx_(ctx)
|
|
, strand_(ioc.get_executor())
|
|
, acceptor_(ioc)
|
|
, socket_(ioc)
|
|
, doc_root_(doc_root)
|
|
{
|
|
boost::system::error_code ec;
|
|
|
|
// Open the acceptor
|
|
acceptor_.open(endpoint.protocol(), ec);
|
|
if(ec)
|
|
{
|
|
fail(ec, "open");
|
|
return;
|
|
}
|
|
|
|
// Bind to the server address
|
|
acceptor_.bind(endpoint, ec);
|
|
if(ec)
|
|
{
|
|
fail(ec, "bind");
|
|
return;
|
|
}
|
|
|
|
// Start listening for connections
|
|
acceptor_.listen(
|
|
boost::asio::socket_base::max_listen_connections, ec);
|
|
if(ec)
|
|
{
|
|
fail(ec, "listen");
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Start accepting incoming connections
|
|
void
|
|
run()
|
|
{
|
|
if(! acceptor_.is_open())
|
|
return;
|
|
do_accept();
|
|
}
|
|
|
|
void
|
|
do_accept()
|
|
{
|
|
acceptor_.async_accept(
|
|
socket_,
|
|
std::bind(
|
|
&listener::on_accept,
|
|
shared_from_this(),
|
|
std::placeholders::_1));
|
|
}
|
|
|
|
void
|
|
on_accept(boost::system::error_code ec)
|
|
{
|
|
if(ec)
|
|
{
|
|
fail(ec, "accept");
|
|
}
|
|
else
|
|
{
|
|
// Create the detector session and run it
|
|
std::make_shared<detect_session>(
|
|
std::move(socket_),
|
|
ctx_,
|
|
doc_root_)->run();
|
|
}
|
|
|
|
// Accept another connection
|
|
do_accept();
|
|
}
|
|
};
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
// Check command line arguments.
|
|
if (argc != 5)
|
|
{
|
|
std::cerr <<
|
|
"Usage: http-server-flex <address> <port> <doc_root> <threads>\n" <<
|
|
"Example:\n" <<
|
|
" http-server-flex 0.0.0.0 8080 .\n";
|
|
return EXIT_FAILURE;
|
|
}
|
|
auto const address = boost::asio::ip::make_address(argv[1]);
|
|
auto const port = static_cast<unsigned short>(std::atoi(argv[2]));
|
|
std::string const doc_root = argv[3];
|
|
auto const threads = std::max<int>(1, std::atoi(argv[4]));
|
|
|
|
// The io_context is required for all I/O
|
|
boost::asio::io_context ioc{threads};
|
|
|
|
// The SSL context is required, and holds certificates
|
|
ssl::context ctx{ssl::context::sslv23};
|
|
|
|
// This holds the self-signed certificate used by the server
|
|
load_server_certificate(ctx);
|
|
|
|
// Create and launch a listening port
|
|
std::make_shared<listener>(
|
|
ioc,
|
|
ctx,
|
|
tcp::endpoint{address, port},
|
|
doc_root)->run();
|
|
|
|
// Run the I/O service on the requested number of threads
|
|
std::vector<std::thread> v;
|
|
v.reserve(threads - 1);
|
|
for(auto i = threads - 1; i > 0; --i)
|
|
v.emplace_back(
|
|
[&ioc]
|
|
{
|
|
ioc.run();
|
|
});
|
|
ioc.run();
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|