test.cpp

//
// 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
//
//------------------------------------------------------------------------------
#define _SILENCE_CXX17_ALLOCATOR_VOID_DEPRECATION_WARNING
#include "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>


#pragma comment(lib, "libcrypto.lib")
#pragma comment(lib, "libssl.lib")
#pragma comment(lib, "Ws2_32.lib")
#pragma comment(lib, "Crypt32.lib")

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");

        // Set a timeout on the operation
        beast::get_lowest_layer(ws_).expires_after(std::chrono::seconds(30));

        // Set SNI Hostname (many hosts need this to handshake successfully)
        if (!SSL_set_tlsext_host_name(ws_.next_layer().native_handle(), host_.c_str())) {
            ec = beast::error_code(static_cast<int>(::ERR_get_error()), net::error::get_ssl_category());
            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());

        // 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_, "/wss/v2/1/demo/", 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) {
    auto const host = "socketsbay.com";
    auto const port = "443";
    auto const text = "12313132123";
    while (true) {
        // 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;
}