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# ssl/client.cpp

    #include <cstdlib>
    #include <iostream>
    #include <boost/bind.hpp>
    #include <boost/asio.hpp>
    #include <boost/asio/ssl.hpp>

    enum { max_length = 1024 };

    class client
    {
    public:
      client(boost::asio::io_service& io_service, boost::asio::ssl::context& context,
          boost::asio::ip::tcp::resolver::iterator endpoint_iterator)
        : socket_(io_service, context)
      {
        boost::asio::ip::tcp::endpoint endpoint = *endpoint_iterator;
        socket_.lowest_layer().async_connect(endpoint,
            boost::bind(&client::handle_connect, this,
              boost::asio::placeholders::error, ++endpoint_iterator));
      }

      void handle_connect(const boost::asio::error& error,
          boost::asio::ip::tcp::resolver::iterator endpoint_iterator)
      {
        if (!error)
        {
          socket_.async_handshake(boost::asio::ssl::stream_base::client,
              boost::bind(&client::handle_handshake, this,
                boost::asio::placeholders::error));
        }
        else if (endpoint_iterator != boost::asio::ip::tcp::resolver::iterator())
        {
          socket_.lowest_layer().close();
          boost::asio::ip::tcp::endpoint endpoint = *endpoint_iterator;
          socket_.lowest_layer().async_connect(endpoint,
              boost::bind(&client::handle_connect, this,
                boost::asio::placeholders::error, ++endpoint_iterator));
        }
        else
        {
          std::cout << "Connect failed: " << error << "\n";
        }
      }

      void handle_handshake(const boost::asio::error& error)
      {
        if (!error)
        {
          std::cout << "Enter message: ";
          std::cin.getline(request_, max_length);
          size_t request_length = strlen(request_);

          boost::asio::async_write(socket_,
              boost::asio::buffer(request_, request_length),
              boost::bind(&client::handle_write, this,
                boost::asio::placeholders::error,
                boost::asio::placeholders::bytes_transferred));
        }
        else
        {
          std::cout << "Handshake failed: " << error << "\n";
        }
      }

      void handle_write(const boost::asio::error& error, size_t bytes_transferred)
      {
        if (!error)
        {
          boost::asio::async_read(socket_,
              boost::asio::buffer(reply_, bytes_transferred),
              boost::bind(&client::handle_read, this,
                boost::asio::placeholders::error,
                boost::asio::placeholders::bytes_transferred));
        }
        else
        {
          std::cout << "Write failed: " << error << "\n";
        }
      }

      void handle_read(const boost::asio::error& error, size_t bytes_transferred)
      {
        if (!error)
        {
          std::cout << "Reply: ";
          std::cout.write(reply_, bytes_transferred);
          std::cout << "\n";
        }
        else
        {
          std::cout << "Read failed: " << error << "\n";
        }
      }

    private:
      boost::asio::ssl::stream<boost::asio::ip::tcp::socket> socket_;
      char request_[max_length];
      char reply_[max_length];
    };

    int main(int argc, char* argv[])
    {
      try
      {
        if (argc != 3)
        {
          std::cerr << "Usage: client <host> <port>\n";
          return 1;
        }

        boost::asio::io_service io_service;

        boost::asio::ip::tcp::resolver resolver(io_service);
        boost::asio::ip::tcp::resolver::query query(argv[1], argv[2]);
        boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query);

        boost::asio::ssl::context ctx(io_service, boost::asio::ssl::context::sslv23);
        ctx.set_verify_mode(boost::asio::ssl::context::verify_peer);
        ctx.load_verify_file("ca.pem");

        client c(io_service, ctx, iterator);

        io_service.run();
      }
      catch (boost::asio::error& e)
      {
        std::cerr << e << "\n";
      }
      catch (std::exception& e)
      {
        std::cerr << "Exception: " << e.what() << "\n";
      }

      return 0;
    }

| Copyright © 2003 - 2006 Christopher M. Kohlhoff