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1 | // |
2 | // receiver.cpp | |
3 | // ~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 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 <iostream> | |
12 | #include <string> | |
13 | #include <boost/asio.hpp> | |
14 | #include "boost/bind.hpp" | |
15 | ||
16 | const short multicast_port = 30001; | |
17 | ||
18 | class receiver | |
19 | { | |
20 | public: | |
21 | receiver(boost::asio::io_service& io_service, | |
22 | const boost::asio::ip::address& listen_address, | |
23 | const boost::asio::ip::address& multicast_address) | |
24 | : socket_(io_service) | |
25 | { | |
26 | // Create the socket so that multiple may be bound to the same address. | |
27 | boost::asio::ip::udp::endpoint listen_endpoint( | |
28 | listen_address, multicast_port); | |
29 | socket_.open(listen_endpoint.protocol()); | |
30 | socket_.set_option(boost::asio::ip::udp::socket::reuse_address(true)); | |
31 | socket_.bind(listen_endpoint); | |
32 | ||
33 | // Join the multicast group. | |
34 | socket_.set_option( | |
35 | boost::asio::ip::multicast::join_group(multicast_address)); | |
36 | ||
37 | socket_.async_receive_from( | |
38 | boost::asio::buffer(data_, max_length), sender_endpoint_, | |
39 | boost::bind(&receiver::handle_receive_from, this, | |
40 | boost::asio::placeholders::error, | |
41 | boost::asio::placeholders::bytes_transferred)); | |
42 | } | |
43 | ||
44 | void handle_receive_from(const boost::system::error_code& error, | |
45 | size_t bytes_recvd) | |
46 | { | |
47 | if (!error) | |
48 | { | |
49 | std::cout.write(data_, bytes_recvd); | |
50 | std::cout << std::endl; | |
51 | ||
52 | socket_.async_receive_from( | |
53 | boost::asio::buffer(data_, max_length), sender_endpoint_, | |
54 | boost::bind(&receiver::handle_receive_from, this, | |
55 | boost::asio::placeholders::error, | |
56 | boost::asio::placeholders::bytes_transferred)); | |
57 | } | |
58 | } | |
59 | ||
60 | private: | |
61 | boost::asio::ip::udp::socket socket_; | |
62 | boost::asio::ip::udp::endpoint sender_endpoint_; | |
63 | enum { max_length = 1024 }; | |
64 | char data_[max_length]; | |
65 | }; | |
66 | ||
67 | int main(int argc, char* argv[]) | |
68 | { | |
69 | try | |
70 | { | |
71 | if (argc != 3) | |
72 | { | |
73 | std::cerr << "Usage: receiver <listen_address> <multicast_address>\n"; | |
74 | std::cerr << " For IPv4, try:\n"; | |
75 | std::cerr << " receiver 0.0.0.0 239.255.0.1\n"; | |
76 | std::cerr << " For IPv6, try:\n"; | |
77 | std::cerr << " receiver 0::0 ff31::8000:1234\n"; | |
78 | return 1; | |
79 | } | |
80 | ||
81 | boost::asio::io_service io_service; | |
82 | receiver r(io_service, | |
83 | boost::asio::ip::address::from_string(argv[1]), | |
84 | boost::asio::ip::address::from_string(argv[2])); | |
85 | io_service.run(); | |
86 | } | |
87 | catch (std::exception& e) | |
88 | { | |
89 | std::cerr << "Exception: " << e.what() << "\n"; | |
90 | } | |
91 | ||
92 | return 0; | |
93 | } |