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

   1 //
   2 // Copyright (c) 2016-2019 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/ssl.hpp>
  21 #include <boost/beast/version.hpp>
  22 #include <boost/asio/connect.hpp>
  23 #include <boost/asio/ip/tcp.hpp>
  24 #include <boost/asio/ssl/error.hpp>
  25 #include <boost/asio/ssl/stream.hpp>
  26 #include <cstdlib>
  27 #include <iostream>
  28 #include <string>
  29
  30 namespace beast = boost::beast; // from <boost/beast.hpp>
  31 namespace http = beast::http;   // from <boost/beast/http.hpp>
  32 namespace net = boost::asio;    // from <boost/asio.hpp>
  33 namespace ssl = net::ssl;       // from <boost/asio/ssl.hpp>
  34 using tcp = net::ip::tcp;       // from <boost/asio/ip/tcp.hpp>
  35
  36 // Performs an HTTP GET and prints the response
  37 int main(int argc, char** argv)
  38 {
  39     try
  40     {
  41         // Check command line arguments.
  42         if(argc != 4 && argc != 5)
  43         {
  44             std::cerr <<
  45                 "Usage: http-client-sync-ssl <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
  46                 "Example:\n" <<
  47                 "    http-client-sync-ssl www.example.com 443 /\n" <<
  48                 "    http-client-sync-ssl www.example.com 443 / 1.0\n";
  49             return EXIT_FAILURE;
  50         }
  51         auto const host = argv[1];
  52         auto const port = argv[2];
  53         auto const target = argv[3];
  54         int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
  55
  56         // The io_context is required for all I/O
  57         net::io_context ioc;
  58
  59         // The SSL context is required, and holds certificates
  60         ssl::context ctx(ssl::context::tlsv12_client);
  61
  62         // This holds the root certificate used for verification
  63         load_root_certificates(ctx);
  64
  65         // Verify the remote server's certificate
  66         ctx.set_verify_mode(ssl::verify_peer);
  67
  68             // These objects perform our I/O
  69         tcp::resolver resolver(ioc);
  70         beast::ssl_stream<beast::tcp_stream> stream(ioc, ctx);
  71
  72         // Set SNI Hostname (many hosts need this to handshake successfully)
  73         if(! SSL_set_tlsext_host_name(stream.native_handle(), host))
  74         {
  75             beast::error_code ec{static_cast<int>(::ERR_get_error()), net::error::get_ssl_category()};
  76             throw beast::system_error{ec};
  77         }
  78
  79         // Look up the domain name
  80         auto const results = resolver.resolve(host, port);
  81
  82         // Make the connection on the IP address we get from a lookup
  83         beast::get_lowest_layer(stream).connect(results);
  84
  85         // Perform the SSL handshake
  86         stream.handshake(ssl::stream_base::client);
  87
  88         // Set up an HTTP GET request message
  89         http::request<http::string_body> req{http::verb::get, target, version};
  90         req.set(http::field::host, host);
  91         req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
  92
  93         // Send the HTTP request to the remote host
  94         http::write(stream, req);
  95
  96         // This buffer is used for reading and must be persisted
  97         beast::flat_buffer buffer;
  98
  99         // Declare a container to hold the response
 100         http::response<http::dynamic_body> res;
 101
 102         // Receive the HTTP response
 103         http::read(stream, buffer, res);
 104
 105         // Write the message to standard out
 106         std::cout << res << std::endl;
 107
 108         // Gracefully close the stream
 109         beast::error_code ec;
 110         stream.shutdown(ec);
 111         if(ec == net::error::eof)
 112         {
 113             // Rationale:
 114             // http://stackoverflow.com/questions/25587403/boost-asio-ssl-async-shutdown-always-finishes-with-an-error
 115             ec = {};
 116         }
 117         if(ec)
 118             throw beast::system_error{ec};
 119
 120         // If we get here then the connection is closed gracefully
 121     }
 122     catch(std::exception const& e)
 123     {
 124         std::cerr << "Error: " << e.what() << std::endl;
 125         return EXIT_FAILURE;
 126     }
 127     return EXIT_SUCCESS;
 128 }