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- //
- // async_udp_echo_server.cpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff 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)
- //
- #include <cstdlib>
- #include <iostream>
- #include <boost/asio.hpp>
- using boost::asio::ip::udp;
- class server
- {
- public:
- server(boost::asio::io_context& io_context, short port)
- : socket_(io_context, udp::endpoint(udp::v4(), port))
- {
- do_receive();
- }
- void do_receive()
- {
- socket_.async_receive_from(
- boost::asio::buffer(data_, max_length), sender_endpoint_,
- [this](boost::system::error_code ec, std::size_t bytes_recvd)
- {
- if (!ec && bytes_recvd > 0)
- {
- do_send(bytes_recvd);
- }
- else
- {
- do_receive();
- }
- });
- }
- void do_send(std::size_t length)
- {
- socket_.async_send_to(
- boost::asio::buffer(data_, length), sender_endpoint_,
- [this](boost::system::error_code /*ec*/, std::size_t /*bytes_sent*/)
- {
- do_receive();
- });
- }
- private:
- udp::socket socket_;
- udp::endpoint sender_endpoint_;
- enum { max_length = 1024 };
- char data_[max_length];
- };
- int main(int argc, char* argv[])
- {
- try
- {
- if (argc != 2)
- {
- std::cerr << "Usage: async_udp_echo_server <port>\n";
- return 1;
- }
- boost::asio::io_context io_context;
- server s(io_context, std::atoi(argv[1]));
- io_context.run();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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