| // |
| // receiver.cpp |
| // ~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 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 <array> |
| #include <iostream> |
| #include <string> |
| #include "asio.hpp" |
| |
| constexpr short multicast_port = 30001; |
| |
| class receiver |
| { |
| public: |
| receiver(asio::io_context& io_context, |
| const asio::ip::address& listen_address, |
| const asio::ip::address& multicast_address) |
| : socket_(io_context) |
| { |
| // Create the socket so that multiple may be bound to the same address. |
| asio::ip::udp::endpoint listen_endpoint( |
| listen_address, multicast_port); |
| socket_.open(listen_endpoint.protocol()); |
| socket_.set_option(asio::ip::udp::socket::reuse_address(true)); |
| socket_.bind(listen_endpoint); |
| |
| // Join the multicast group. |
| socket_.set_option( |
| asio::ip::multicast::join_group(multicast_address)); |
| |
| do_receive(); |
| } |
| |
| private: |
| void do_receive() |
| { |
| socket_.async_receive_from( |
| asio::buffer(data_), sender_endpoint_, |
| [this](std::error_code ec, std::size_t length) |
| { |
| if (!ec) |
| { |
| std::cout.write(data_.data(), length); |
| std::cout << std::endl; |
| |
| do_receive(); |
| } |
| }); |
| } |
| |
| asio::ip::udp::socket socket_; |
| asio::ip::udp::endpoint sender_endpoint_; |
| std::array<char, 1024> data_; |
| }; |
| |
| int main(int argc, char* argv[]) |
| { |
| try |
| { |
| if (argc != 3) |
| { |
| std::cerr << "Usage: receiver <listen_address> <multicast_address>\n"; |
| std::cerr << " For IPv4, try:\n"; |
| std::cerr << " receiver 0.0.0.0 239.255.0.1\n"; |
| std::cerr << " For IPv6, try:\n"; |
| std::cerr << " receiver 0::0 ff31::8000:1234\n"; |
| return 1; |
| } |
| |
| asio::io_context io_context; |
| receiver r(io_context, |
| asio::ip::make_address(argv[1]), |
| asio::ip::make_address(argv[2])); |
| io_context.run(); |
| } |
| catch (std::exception& e) |
| { |
| std::cerr << "Exception: " << e.what() << "\n"; |
| } |
| |
| return 0; |
| } |