132 lines
4.4 KiB
C++
132 lines
4.4 KiB
C++
/*
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Copyright (c) 2007, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_BROADCAST_SOCKET_HPP_INCLUDED
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#define TORRENT_BROADCAST_SOCKET_HPP_INCLUDED
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#include "libtorrent/config.hpp"
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#include "libtorrent/io_service_fwd.hpp"
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#include "libtorrent/socket.hpp"
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#include "libtorrent/address.hpp"
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#include "libtorrent/error_code.hpp"
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#include <boost/shared_ptr.hpp>
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#include <boost/function/function3.hpp>
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#include <list>
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namespace libtorrent
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{
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TORRENT_EXPORT bool is_local(address const& a);
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TORRENT_EXPORT bool is_loopback(address const& addr);
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TORRENT_EXPORT bool is_multicast(address const& addr);
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TORRENT_EXPORT bool is_any(address const& addr);
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TORRENT_EXPORT bool is_teredo(address const& addr);
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TORRENT_EXPORT int cidr_distance(address const& a1, address const& a2);
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// determines if the operating system supports IPv6
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TORRENT_EXPORT bool supports_ipv6();
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TORRENT_EXPORT int common_bits(unsigned char const* b1
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, unsigned char const* b2, int n);
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TORRENT_EXPORT address guess_local_address(io_service&);
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typedef boost::function<void(udp::endpoint const& from
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, char* buffer, int size)> receive_handler_t;
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class TORRENT_EXPORT broadcast_socket
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{
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public:
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broadcast_socket(io_service& ios, udp::endpoint const& multicast_endpoint
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, receive_handler_t const& handler, bool loopback = true);
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~broadcast_socket() { close(); }
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void send(char const* buffer, int size, error_code& ec);
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void close();
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int num_send_sockets() const { return m_unicast_sockets.size(); }
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void enable_ip_broadcast(bool e);
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private:
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struct socket_entry
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{
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socket_entry(boost::shared_ptr<datagram_socket> const& s)
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: socket(s) {}
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socket_entry(boost::shared_ptr<datagram_socket> const& s
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, address_v4 const& mask): socket(s), netmask(mask) {}
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boost::shared_ptr<datagram_socket> socket;
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char buffer[1024];
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udp::endpoint remote;
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address_v4 netmask;
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void close()
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{
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if (!socket) return;
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error_code ec;
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socket->close(ec);
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}
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address_v4 broadcast_address() const
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{
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error_code ec;
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return address_v4::broadcast(socket->local_endpoint(ec).address().to_v4(), netmask);
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}
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};
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void on_receive(socket_entry* s, error_code const& ec
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, std::size_t bytes_transferred);
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void open_unicast_socket(io_service& ios, address const& addr
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, address_v4 const& mask);
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void open_multicast_socket(io_service& ios, address const& addr
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, bool loopback, error_code& ec);
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// these sockets are used to
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// join the multicast group (on each interface)
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// and receive multicast messages
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std::list<socket_entry> m_sockets;
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// these sockets are not bound to any
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// specific port and are used to
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// send messages to the multicast group
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// and receive unicast responses
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std::list<socket_entry> m_unicast_sockets;
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udp::endpoint m_multicast_endpoint;
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receive_handler_t m_on_receive;
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// if set, use IP broadcast as well as IP multicast
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// this is off by default because it's expensive in
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// terms of bandwidth usage
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bool m_ip_broadcast;
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};
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}
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#endif
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