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- //
- // 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)
- {
- if(ec)
- return fail(ec, "connect");
- // 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;
- }
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