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1 | // | |
2 | // async_udp_echo_server.cpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #include <cstdlib> | |
12 | #include <iostream> | |
13 | #include <boost/asio.hpp> | |
14 | ||
15 | using boost::asio::ip::udp; | |
16 | ||
17 | class server | |
18 | { | |
19 | public: | |
20 | server(boost::asio::io_context& io_context, short port) | |
21 | : socket_(io_context, udp::endpoint(udp::v4(), port)) | |
22 | { | |
23 | do_receive(); | |
24 | } | |
25 | ||
26 | void do_receive() | |
27 | { | |
28 | socket_.async_receive_from( | |
29 | boost::asio::buffer(data_, max_length), sender_endpoint_, | |
30 | [this](boost::system::error_code ec, std::size_t bytes_recvd) | |
31 | { | |
32 | if (!ec && bytes_recvd > 0) | |
33 | { | |
34 | do_send(bytes_recvd); | |
35 | } | |
36 | else | |
37 | { | |
38 | do_receive(); | |
39 | } | |
40 | }); | |
41 | } | |
42 | ||
43 | void do_send(std::size_t length) | |
44 | { | |
45 | socket_.async_send_to( | |
46 | boost::asio::buffer(data_, length), sender_endpoint_, | |
47 | [this](boost::system::error_code /*ec*/, std::size_t /*bytes_sent*/) | |
48 | { | |
49 | do_receive(); | |
50 | }); | |
51 | } | |
52 | ||
53 | private: | |
54 | udp::socket socket_; | |
55 | udp::endpoint sender_endpoint_; | |
56 | enum { max_length = 1024 }; | |
57 | char data_[max_length]; | |
58 | }; | |
59 | ||
60 | int main(int argc, char* argv[]) | |
61 | { | |
62 | try | |
63 | { | |
64 | if (argc != 2) | |
65 | { | |
66 | std::cerr << "Usage: async_udp_echo_server <port>\n"; | |
67 | return 1; | |
68 | } | |
69 | ||
70 | boost::asio::io_context io_context; | |
71 | ||
72 | server s(io_context, std::atoi(argv[1])); | |
73 | ||
74 | io_context.run(); | |
75 | } | |
76 | catch (std::exception& e) | |
77 | { | |
78 | std::cerr << "Exception: " << e.what() << "\n"; | |
79 | } | |
80 | ||
81 | return 0; | |
82 | } |