90 lines
2.0 KiB
C++
90 lines
2.0 KiB
C++
//
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// server.cpp
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// ~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <ctime>
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#include <iostream>
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#include <string>
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#include <boost/array.hpp>
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#include <boost/bind.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/asio.hpp>
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using boost::asio::ip::udp;
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std::string make_daytime_string()
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{
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using namespace std; // For time_t, time and ctime;
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time_t now = time(0);
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return ctime(&now);
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}
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class udp_server
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{
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public:
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udp_server(boost::asio::io_context& io_context)
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: socket_(io_context, udp::endpoint(udp::v4(), 13))
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{
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start_receive();
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}
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private:
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void start_receive()
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{
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socket_.async_receive_from(
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boost::asio::buffer(recv_buffer_), remote_endpoint_,
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boost::bind(&udp_server::handle_receive, this,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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}
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void handle_receive(const boost::system::error_code& error,
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std::size_t /*bytes_transferred*/)
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{
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if (!error)
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{
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boost::shared_ptr<std::string> message(
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new std::string(make_daytime_string()));
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socket_.async_send_to(boost::asio::buffer(*message), remote_endpoint_,
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boost::bind(&udp_server::handle_send, this, message,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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start_receive();
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}
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}
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void handle_send(boost::shared_ptr<std::string> /*message*/,
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const boost::system::error_code& /*error*/,
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std::size_t /*bytes_transferred*/)
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{
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}
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udp::socket socket_;
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udp::endpoint remote_endpoint_;
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boost::array<char, 1> recv_buffer_;
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};
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int main()
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{
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try
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{
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boost::asio::io_context io_context;
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udp_server server(io_context);
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io_context.run();
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}
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catch (std::exception& e)
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{
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std::cerr << e.what() << std::endl;
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}
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return 0;
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}
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