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Diffstat (limited to 'http_debian10.cpp')
| -rw-r--r-- | http_debian10.cpp | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/http_debian10.cpp b/http_debian10.cpp new file mode 100644 index 0000000..252cf56 --- /dev/null +++ b/http_debian10.cpp @@ -0,0 +1,529 @@ +#include <boost/beast/version.hpp> + +#if BOOST_VERSION < 107100 + +#include "server_certificate.h" + +#include <boost/beast/core.hpp> +#include <boost/beast/http.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> +#include <vector> + +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())); + + // Cache the size since we need it after the move + auto const size = body.size(); + + // 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(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(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 +class session : public std::enable_shared_from_this<session> +{ + // 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_.stream_, + *sp, + boost::asio::bind_executor( + self_.strand_, + std::bind( + &session::on_write, + self_.shared_from_this(), + std::placeholders::_1, + std::placeholders::_2, + sp->need_eof()))); + } + }; + + tcp::socket socket_; + ssl::stream<tcp::socket&> stream_; + boost::asio::strand< + boost::asio::io_context::executor_type> strand_; + boost::beast::flat_buffer buffer_; + std::string const& doc_root_; + http::request<http::string_body> req_; + std::shared_ptr<void> res_; + send_lambda lambda_; + +public: + // Take ownership of the socket + explicit + session( + tcp::socket socket, + ssl::context& ctx, + std::string const& doc_root) + : socket_(std::move(socket)) + , stream_(socket_, ctx) + , strand_(socket_.get_executor()) + , doc_root_(doc_root) + , lambda_(*this) + { + } + + // Start the asynchronous operation + void + run() + { + // Perform the SSL handshake + stream_.async_handshake( + ssl::stream_base::server, + boost::asio::bind_executor( + strand_, + std::bind( + &session::on_handshake, + shared_from_this(), + std::placeholders::_1))); + } + + void + on_handshake(boost::system::error_code ec) + { + if(ec) + return fail(ec, "handshake"); + + do_read(); + } + + void + do_read() + { + // Make the request empty before reading, + // otherwise the operation behavior is undefined. + req_ = {}; + + // Read a request + http::async_read(stream_, buffer_, req_, + boost::asio::bind_executor( + strand_, + std::bind( + &session::on_read, + 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 do_close(); + + 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 do_close(); + } + + // We're done with the response so delete it + res_ = nullptr; + + // Read another request + do_read(); + } + + void + do_close() + { + // Perform the SSL shutdown + stream_.async_shutdown( + boost::asio::bind_executor( + strand_, + std::bind( + &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 + } +}; + +//------------------------------------------------------------------------------ + +// Accepts incoming connections and launches the sessions +class listener : public std::enable_shared_from_this<listener> +{ + ssl::context& ctx_; + 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) + , 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; + } + + // Allow address reuse + acceptor_.set_option(boost::asio::socket_base::reuse_address(true)); + if(ec) + { + fail(ec, "set_option"); + 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 session and run it + std::make_shared<session>( + std::move(socket_), + ctx_, + doc_root_)->run(); + } + + // Accept another connection + do_accept(); + } +}; + +//------------------------------------------------------------------------------ + +int http_server(int argc, char* argv[]) +{ + // Check command line arguments. + if (argc != 5) + { + std::cerr << + "Usage: http-server-async-ssl <address> <port> <doc_root> <threads>\n" << + "Example:\n" << + " http-server-async-ssl 0.0.0.0 8080 . 1\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; +} + +#endif |