ceph/src/boost/libs/beast/example/http/client/sync-ssl/http_client_sync_ssl.cpp

   1 //
   2 // Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // Official repository: https://github.com/boostorg/beast
   8 //
   9
  10 //------------------------------------------------------------------------------
  11 //
  12 // Example: HTTP SSL client, synchronous
  13 //
  14 //------------------------------------------------------------------------------
  15
  16 #include "example/common/root_certificates.hpp"
  17
  18 #include <boost/beast/core.hpp>
  19 #include <boost/beast/http.hpp>
  20 #include <boost/beast/version.hpp>
  21 #include <boost/asio/connect.hpp>
  22 #include <boost/asio/ip/tcp.hpp>
  23 #include <boost/asio/ssl/error.hpp>
  24 #include <boost/asio/ssl/stream.hpp>
  25 #include <cstdlib>
  26 #include <iostream>
  27 #include <string>
  28
  29 using tcp = boost::asio::ip::tcp;       // from <boost/asio/ip/tcp.hpp>
  30 namespace ssl = boost::asio::ssl;       // from <boost/asio/ssl.hpp>
  31 namespace http = boost::beast::http;    // from <boost/beast/http.hpp>
  32
  33 // Performs an HTTP GET and prints the response
  34 int main(int argc, char** argv)
  35 {
  36     try
  37     {
  38         // Check command line arguments.
  39         if(argc != 4 && argc != 5)
  40         {
  41             std::cerr <<
  42                 "Usage: http-client-sync-ssl <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
  43                 "Example:\n" <<
  44                 "    http-client-sync-ssl www.example.com 443 /\n" <<
  45                 "    http-client-sync-ssl www.example.com 443 / 1.0\n";
  46             return EXIT_FAILURE;
  47         }
  48         auto const host = argv[1];
  49         auto const port = argv[2];
  50         auto const target = argv[3];
  51         int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
  52
  53         // The io_context is required for all I/O
  54         boost::asio::io_context ioc;
  55
  56         // The SSL context is required, and holds certificates
  57         ssl::context ctx{ssl::context::sslv23_client};
  58
  59         // This holds the root certificate used for verification
  60         load_root_certificates(ctx);
  61
  62         // These objects perform our I/O
  63         tcp::resolver resolver{ioc};
  64         ssl::stream<tcp::socket> stream{ioc, ctx};
  65
  66         // Set SNI Hostname (many hosts need this to handshake successfully)
  67         if(! SSL_set_tlsext_host_name(stream.native_handle(), host))
  68         {
  69             boost::system::error_code ec{static_cast<int>(::ERR_get_error()), boost::asio::error::get_ssl_category()};
  70             throw boost::system::system_error{ec};
  71         }
  72
  73         // Look up the domain name
  74         auto const results = resolver.resolve(host, port);
  75
  76         // Make the connection on the IP address we get from a lookup
  77         boost::asio::connect(stream.next_layer(), results.begin(), results.end());
  78
  79         // Perform the SSL handshake
  80         stream.handshake(ssl::stream_base::client);
  81
  82         // Set up an HTTP GET request message
  83         http::request<http::string_body> req{http::verb::get, target, version};
  84         req.set(http::field::host, host);
  85         req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
  86
  87         // Send the HTTP request to the remote host
  88         http::write(stream, req);
  89
  90         // This buffer is used for reading and must be persisted
  91         boost::beast::flat_buffer buffer;
  92
  93         // Declare a container to hold the response
  94         http::response<http::dynamic_body> res;
  95
  96         // Receive the HTTP response
  97         http::read(stream, buffer, res);
  98
  99         // Write the message to standard out
 100         std::cout << res << std::endl;
 101
 102         // Gracefully close the stream
 103         boost::system::error_code ec;
 104         stream.shutdown(ec);
 105         if(ec == boost::asio::error::eof)
 106         {
 107             // Rationale:
 108             // http://stackoverflow.com/questions/25587403/boost-asio-ssl-async-shutdown-always-finishes-with-an-error
 109             ec.assign(0, ec.category());
 110         }
 111         if(ec)
 112             throw boost::system::system_error{ec};
 113
 114         // If we get here then the connection is closed gracefully
 115     }
 116     catch(std::exception const& e)
 117     {
 118         std::cerr << "Error: " << e.what() << std::endl;
 119         return EXIT_FAILURE;
 120     }
 121     return EXIT_SUCCESS;
 122 }