receiver.cpp
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//
// receiver.cpp
// ~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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;
}