// // Copyright (c) 2016-2017 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: HTTP SSL client, synchronous // //------------------------------------------------------------------------------ #include "example/common/root_certificates.hpp" #include <boost/beast/core.hpp> #include <boost/beast/http.hpp> #include <boost/beast/version.hpp> #include <boost/asio/connect.hpp> #include <boost/asio/ip/tcp.hpp> #include <boost/asio/ssl/error.hpp> #include <boost/asio/ssl/stream.hpp> #include <cstdlib> #include <iostream> #include <string> 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> // Performs an HTTP GET and prints the response int main(int argc, char** argv) { try { // Check command line arguments. if(argc != 4 && argc != 5) { std::cerr << "Usage: http-client-sync-ssl <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" << "Example:\n" << " http-client-sync-ssl www.example.com 443 /\n" << " http-client-sync-ssl www.example.com 443 / 1.0\n"; return EXIT_FAILURE; } auto const host = argv[1]; auto const port = argv[2]; auto const target = argv[3]; int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11; // The io_context is required for all I/O boost::asio::io_context ioc; // The SSL context is required, and holds certificates ssl::context ctx{ssl::context::sslv23_client}; // This holds the root certificate used for verification load_root_certificates(ctx); // These objects perform our I/O tcp::resolver resolver{ioc}; ssl::stream<tcp::socket> stream{ioc, ctx}; // Set SNI Hostname (many hosts need this to handshake successfully) if(! SSL_set_tlsext_host_name(stream.native_handle(), host)) { boost::system::error_code ec{static_cast<int>(::ERR_get_error()), boost::asio::error::get_ssl_category()}; throw boost::system::system_error{ec}; } // Look up the domain name auto const results = resolver.resolve(host, port); // Make the connection on the IP address we get from a lookup boost::asio::connect(stream.next_layer(), results.begin(), results.end()); // Perform the SSL handshake stream.handshake(ssl::stream_base::client); // Set up an HTTP GET request message http::request<http::string_body> req{http::verb::get, target, version}; req.set(http::field::host, host); req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING); // Send the HTTP request to the remote host http::write(stream, req); // This buffer is used for reading and must be persisted boost::beast::flat_buffer buffer; // Declare a container to hold the response http::response<http::dynamic_body> res; // Receive the HTTP response http::read(stream, buffer, res); // Write the message to standard out std::cout << res << std::endl; // Gracefully close the stream boost::system::error_code ec; stream.shutdown(ec); if(ec == boost::asio::error::eof) { // Rationale: // http://stackoverflow.com/questions/25587403/boost-asio-ssl-async-shutdown-always-finishes-with-an-error ec.assign(0, ec.category()); } if(ec) throw boost::system::system_error{ec}; // If we get here then the connection is closed gracefully } catch(std::exception const& e) { std::cerr << "Error: " << e.what() << std::endl; return EXIT_FAILURE; } return EXIT_SUCCESS; }