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Diffstat (limited to 'src/boost/libs/beast/example/websocket/client/async-ssl/websocket_client_async_ssl.cpp')
| -rw-r--r-- | src/boost/libs/beast/example/websocket/client/async-ssl/websocket_client_async_ssl.cpp | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/src/boost/libs/beast/example/websocket/client/async-ssl/websocket_client_async_ssl.cpp b/src/boost/libs/beast/example/websocket/client/async-ssl/websocket_client_async_ssl.cpp new file mode 100644 index 000000000..4d413aa78 --- /dev/null +++ b/src/boost/libs/beast/example/websocket/client/async-ssl/websocket_client_async_ssl.cpp @@ -0,0 +1,252 @@ +// +// Copyright (c) 2016-2019 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: WebSocket SSL client, asynchronous +// +//------------------------------------------------------------------------------ + +#include "example/common/root_certificates.hpp" + +#include <boost/beast/core.hpp> +#include <boost/beast/ssl.hpp> +#include <boost/beast/websocket.hpp> +#include <boost/beast/websocket/ssl.hpp> +#include <boost/asio/strand.hpp> +#include <cstdlib> +#include <functional> +#include <iostream> +#include <memory> +#include <string> + +namespace beast = boost::beast; // from <boost/beast.hpp> +namespace http = beast::http; // from <boost/beast/http.hpp> +namespace websocket = beast::websocket; // from <boost/beast/websocket.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> + +//------------------------------------------------------------------------------ + +// Report a failure +void +fail(beast::error_code ec, char const* what) +{ + std::cerr << what << ": " << ec.message() << "\n"; +} + +// Sends a WebSocket message and prints the response +class session : public std::enable_shared_from_this<session> +{ + tcp::resolver resolver_; + websocket::stream< + beast::ssl_stream<beast::tcp_stream>> ws_; + beast::flat_buffer buffer_; + std::string host_; + std::string text_; + +public: + // Resolver and socket require an io_context + explicit + session(net::io_context& ioc, ssl::context& ctx) + : resolver_(net::make_strand(ioc)) + , ws_(net::make_strand(ioc), ctx) + { + } + + // Start the asynchronous operation + void + run( + char const* host, + char const* port, + char const* text) + { + // Save these for later + host_ = host; + text_ = text; + + // Look up the domain name + resolver_.async_resolve( + host, + port, + beast::bind_front_handler( + &session::on_resolve, + shared_from_this())); + } + + void + on_resolve( + beast::error_code ec, + tcp::resolver::results_type results) + { + if(ec) + return fail(ec, "resolve"); + + // Set a timeout on the operation + beast::get_lowest_layer(ws_).expires_after(std::chrono::seconds(30)); + + // Make the connection on the IP address we get from a lookup + beast::get_lowest_layer(ws_).async_connect( + results, + beast::bind_front_handler( + &session::on_connect, + shared_from_this())); + } + + void + on_connect(beast::error_code ec, tcp::resolver::results_type::endpoint_type ep) + { + if(ec) + return fail(ec, "connect"); + + // Update the host_ string. This will provide the value of the + // Host HTTP header during the WebSocket handshake. + // See https://tools.ietf.org/html/rfc7230#section-5.4 + host_ += ':' + std::to_string(ep.port()); + + // Set a timeout on the operation + beast::get_lowest_layer(ws_).expires_after(std::chrono::seconds(30)); + + // Perform the SSL handshake + ws_.next_layer().async_handshake( + ssl::stream_base::client, + beast::bind_front_handler( + &session::on_ssl_handshake, + shared_from_this())); + } + + void + on_ssl_handshake(beast::error_code ec) + { + if(ec) + return fail(ec, "ssl_handshake"); + + // Turn off the timeout on the tcp_stream, because + // the websocket stream has its own timeout system. + beast::get_lowest_layer(ws_).expires_never(); + + // Set suggested timeout settings for the websocket + ws_.set_option( + websocket::stream_base::timeout::suggested( + beast::role_type::client)); + + // Set a decorator to change the User-Agent of the handshake + ws_.set_option(websocket::stream_base::decorator( + [](websocket::request_type& req) + { + req.set(http::field::user_agent, + std::string(BOOST_BEAST_VERSION_STRING) + + " websocket-client-async-ssl"); + })); + + // Perform the websocket handshake + ws_.async_handshake(host_, "/", + beast::bind_front_handler( + &session::on_handshake, + shared_from_this())); + } + + void + on_handshake(beast::error_code ec) + { + if(ec) + return fail(ec, "handshake"); + + // Send the message + ws_.async_write( + net::buffer(text_), + beast::bind_front_handler( + &session::on_write, + shared_from_this())); + } + + void + on_write( + beast::error_code ec, + std::size_t bytes_transferred) + { + boost::ignore_unused(bytes_transferred); + + if(ec) + return fail(ec, "write"); + + // Read a message into our buffer + ws_.async_read( + buffer_, + 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); + + if(ec) + return fail(ec, "read"); + + // Close the WebSocket connection + ws_.async_close(websocket::close_code::normal, + beast::bind_front_handler( + &session::on_close, + shared_from_this())); + } + + void + on_close(beast::error_code ec) + { + if(ec) + return fail(ec, "close"); + + // If we get here then the connection is closed gracefully + + // The make_printable() function helps print a ConstBufferSequence + std::cout << beast::make_printable(buffer_.data()) << std::endl; + } +}; + +//------------------------------------------------------------------------------ + +int main(int argc, char** argv) +{ + // Check command line arguments. + if(argc != 4) + { + std::cerr << + "Usage: websocket-client-async-ssl <host> <port> <text>\n" << + "Example:\n" << + " websocket-client-async-ssl echo.websocket.org 443 \"Hello, world!\"\n"; + return EXIT_FAILURE; + } + auto const host = argv[1]; + auto const port = argv[2]; + auto const text = argv[3]; + + // The io_context is required for all I/O + net::io_context ioc; + + // The SSL context is required, and holds certificates + ssl::context ctx{ssl::context::tlsv12_client}; + + // This holds the root certificate used for verification + load_root_certificates(ctx); + + // Launch the asynchronous operation + std::make_shared<session>(ioc, ctx)->run(host, port, text); + + // Run the I/O service. The call will return when + // the socket is closed. + ioc.run(); + + return EXIT_SUCCESS; +} |