93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
//
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// async_udp_echo_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 <cstdlib>
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#include <iostream>
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#include <boost/bind.hpp>
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#include <boost/asio.hpp>
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using boost::asio::ip::udp;
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class server
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{
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public:
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server(boost::asio::io_context& io_context, short port)
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: socket_(io_context, udp::endpoint(udp::v4(), port))
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{
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socket_.async_receive_from(
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boost::asio::buffer(data_, max_length), sender_endpoint_,
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boost::bind(&server::handle_receive_from, 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_from(const boost::system::error_code& error,
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size_t bytes_recvd)
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{
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if (!error && bytes_recvd > 0)
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{
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socket_.async_send_to(
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boost::asio::buffer(data_, bytes_recvd), sender_endpoint_,
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boost::bind(&server::handle_send_to, 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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else
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{
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socket_.async_receive_from(
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boost::asio::buffer(data_, max_length), sender_endpoint_,
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boost::bind(&server::handle_receive_from, 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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}
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void handle_send_to(const boost::system::error_code& /*error*/,
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size_t /*bytes_sent*/)
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{
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socket_.async_receive_from(
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boost::asio::buffer(data_, max_length), sender_endpoint_,
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boost::bind(&server::handle_receive_from, 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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private:
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udp::socket socket_;
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udp::endpoint sender_endpoint_;
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enum { max_length = 1024 };
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char data_[max_length];
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};
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int main(int argc, char* argv[])
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{
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try
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{
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if (argc != 2)
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{
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std::cerr << "Usage: async_udp_echo_server <port>\n";
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return 1;
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}
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boost::asio::io_context io_context;
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using namespace std; // For atoi.
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server s(io_context, atoi(argv[1]));
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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 << "Exception: " << e.what() << "\n";
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}
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return 0;
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}
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