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-rw-r--r--webserver.cpp547
1 files changed, 2 insertions, 545 deletions
diff --git a/webserver.cpp b/webserver.cpp
index d2d1bee..4b6a89c 100644
--- a/webserver.cpp
+++ b/webserver.cpp
@@ -1,549 +1,6 @@
-#include "server_certificate.h"
-
-#include <boost/beast/core.hpp>
-#include <boost/beast/http.hpp>
-#include <boost/beast/ssl.hpp>
-#include <boost/beast/version.hpp>
-#include <boost/asio/dispatch.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>
-
-namespace beast = boost::beast; // from <boost/beast.hpp>
-namespace http = beast::http; // from <boost/beast/http.hpp>
-namespace net = boost::asio; // from <boost/asio.hpp>
-namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
-using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
-
-// Return a reasonable mime type based on the extension of a file.
-beast::string_view
-mime_type(beast::string_view path)
-{
- using beast::iequals;
- auto const ext = [&path]
- {
- auto const pos = path.rfind(".");
- if(pos == beast::string_view::npos)
- return 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(
- beast::string_view base,
- beast::string_view path)
-{
- if(base.empty())
- return std::string(path);
- std::string result(base);
-#ifdef 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(
- 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](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() = std::string(why);
- res.prepare_payload();
- return res;
- };
-
- // Returns a not found response
- auto const not_found =
- [&req](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 '" + std::string(target) + "' was not found.";
- res.prepare_payload();
- return res;
- };
-
- // Returns a server error response
- auto const server_error =
- [&req](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: '" + std::string(what) + "'";
- 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("..") != 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
- beast::error_code ec;
- http::file_body::value_type body;
- body.open(path.c_str(), beast::file_mode::scan, ec);
-
- // Handle the case where the file doesn't exist
- if(ec == beast::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(beast::error_code ec, char const* what)
-{
- // ssl::error::stream_truncated, also known as an SSL "short read",
- // indicates the peer closed the connection without performing the
- // required closing handshake (for example, Google does this to
- // improve performance). Generally this can be a security issue,
- // but if your communication protocol is self-terminated (as
- // it is with both HTTP and WebSocket) then you may simply
- // ignore the lack of close_notify.
- //
- // https://github.com/boostorg/beast/issues/38
- //
- // https://security.stackexchange.com/questions/91435/how-to-handle-a-malicious-ssl-tls-shutdown
- //
- // When a short read would cut off the end of an HTTP message,
- // Beast returns the error beast::http::error::partial_message.
- // Therefore, if we see a short read here, it has occurred
- // after the message has been completed, so it is safe to ignore it.
-
- if(ec == net::ssl::error::stream_truncated)
- return;
-
- 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,
- beast::bind_front_handler(
- &session::on_write,
- self_.shared_from_this(),
- sp->need_eof()));
- }
- };
-
- beast::ssl_stream<beast::tcp_stream> stream_;
- beast::flat_buffer buffer_;
- std::shared_ptr<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::shared_ptr<std::string const> const& doc_root)
- : stream_(std::move(socket), ctx)
- , doc_root_(doc_root)
- , lambda_(*this)
- {
- }
-
- // Start the asynchronous operation
- void
- run()
- {
- // We need to be executing within a strand to perform async operations
- // on the I/O objects in this session. Although not strictly necessary
- // for single-threaded contexts, this example code is written to be
- // thread-safe by default.
- net::dispatch(
- stream_.get_executor(),
- beast::bind_front_handler(
- &session::on_run,
- shared_from_this()));
- }
-
- void
- on_run()
- {
- // Set the timeout.
- beast::get_lowest_layer(stream_).expires_after(
- std::chrono::seconds(30));
-
- // Perform the SSL handshake
- stream_.async_handshake(
- ssl::stream_base::server,
- beast::bind_front_handler(
- &session::on_handshake,
- shared_from_this()));
- }
-
- void
- on_handshake(beast::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_ = {};
-
- // Set the timeout.
- beast::get_lowest_layer(stream_).expires_after(std::chrono::seconds(30));
-
- // Read a request
- http::async_read(stream_, buffer_, req_,
- beast::bind_front_handler(
- &session::on_read,
- shared_from_this()));
- }
-
- void
- on_read(
- beast::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(
- bool close,
- beast::error_code ec,
- std::size_t bytes_transferred)
- {
- 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()
- {
- // Set the timeout.
- beast::get_lowest_layer(stream_).expires_after(std::chrono::seconds(30));
-
- // Perform the SSL shutdown
- stream_.async_shutdown(
- beast::bind_front_handler(
- &session::on_shutdown,
- shared_from_this()));
- }
-
- void
- on_shutdown(beast::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>
-{
- net::io_context& ioc_;
- ssl::context& ctx_;
- tcp::acceptor acceptor_;
- std::shared_ptr<std::string const> doc_root_;
-
-public:
- listener(
- net::io_context& ioc,
- ssl::context& ctx,
- tcp::endpoint endpoint,
- std::shared_ptr<std::string const> const& doc_root)
- : ioc_(ioc)
- , ctx_(ctx)
- , acceptor_(ioc)
- , doc_root_(doc_root)
- {
- beast::error_code ec;
-
- // Open the acceptor
- acceptor_.open(endpoint.protocol(), ec);
- if(ec)
- {
- fail(ec, "open");
- return;
- }
-
- // Allow address reuse
- acceptor_.set_option(net::socket_base::reuse_address(true), ec);
- 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(
- net::socket_base::max_listen_connections, ec);
- if(ec)
- {
- fail(ec, "listen");
- return;
- }
- }
-
- // Start accepting incoming connections
- void
- run()
- {
- do_accept();
- }
-
-private:
- void
- do_accept()
- {
- // The new connection gets its own strand
- acceptor_.async_accept(
- net::make_strand(ioc_),
- beast::bind_front_handler(
- &listener::on_accept,
- shared_from_this()));
- }
-
- void
- on_accept(beast::error_code ec, tcp::socket socket)
- {
- 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();
- }
-};
-
-//------------------------------------------------------------------------------
+#include "http.h"
int main(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 = net::ip::make_address(argv[1]);
- auto const port = static_cast<unsigned short>(std::atoi(argv[2]));
- auto const doc_root = std::make_shared<std::string>(argv[3]);
- auto const threads = std::max<int>(1, std::atoi(argv[4]));
-
- // The io_context is required for all I/O
- net::io_context ioc{threads};
-
- // The SSL context is required, and holds certificates
- ssl::context ctx{ssl::context::tlsv12};
-
- // 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;
+ return http_server(argc, argv);
}