155 lines
3.9 KiB
C++
155 lines
3.9 KiB
C++
/*
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Copyright (c) 2013, 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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#include "libtorrent/thread.hpp"
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#include "libtorrent/bencode.hpp"
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#include "libtorrent/entry.hpp"
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#include "libtorrent/address.hpp"
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#include "libtorrent/io_service.hpp"
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#include "libtorrent/error_code.hpp"
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#include "libtorrent/socket.hpp"
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#include <boost/detail/atomic_count.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/bind.hpp>
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using namespace libtorrent;
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struct dht_server
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{
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boost::asio::io_service m_ios;
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boost::detail::atomic_count m_dht_requests;
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udp::socket m_socket;
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int m_port;
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boost::shared_ptr<libtorrent::thread> m_thread;
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dht_server()
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: m_dht_requests(0)
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, m_socket(m_ios)
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{
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error_code ec;
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m_socket.open(udp::v4(), ec);
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if (ec)
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{
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fprintf(stderr, "Error opening listen DHT socket: %s\n", ec.message().c_str());
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return;
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}
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m_socket.bind(udp::endpoint(address_v4::any(), 0), ec);
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if (ec)
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{
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fprintf(stderr, "Error binding DHT socket to port 0: %s\n", ec.message().c_str());
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return;
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}
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m_port = m_socket.local_endpoint(ec).port();
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if (ec)
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{
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fprintf(stderr, "Error getting local endpoint of DHT socket: %s\n", ec.message().c_str());
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return;
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}
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fprintf(stderr, "DHT initialized on port %d\n", m_port);
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m_thread.reset(new thread(boost::bind(&dht_server::thread_fun, this)));
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}
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~dht_server()
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{
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m_socket.close();
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if (m_thread) m_thread->join();
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}
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int port() const { return m_port; }
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int num_hits() const { return m_dht_requests; }
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void thread_fun()
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{
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char buffer[2000];
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for (;;)
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{
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error_code ec;
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udp::endpoint from;
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int bytes_transferred = m_socket.receive_from(
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asio::buffer(buffer, sizeof(buffer)), from, 0, ec);
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if (ec == boost::asio::error::operation_aborted
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|| ec == boost::asio::error::bad_descriptor) return;
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if (ec)
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{
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fprintf(stderr, "Error receiving on DHT socket: %s\n", ec.message().c_str());
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return;
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}
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try
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{
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entry msg = bdecode(buffer, buffer + bytes_transferred);
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#if defined TORRENT_DEBUG && TORRENT_USE_IOSTREAM
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std::cerr << msg << std::endl;
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#endif
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++m_dht_requests;
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}
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catch (std::exception& e)
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{
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fprintf(stderr, "failed to decode DHT message: %s\n", e.what());
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}
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}
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}
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};
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boost::shared_ptr<dht_server> g_dht;
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int start_dht()
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{
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g_dht.reset(new dht_server);
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return g_dht->port();
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}
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// the number of DHT messages received
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int num_dht_hits()
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{
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if (g_dht) return g_dht->num_hits();
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return 0;
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}
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void stop_dht()
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{
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fprintf(stderr, "stop_dht()\n");
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g_dht.reset();
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fprintf(stderr, "done\n");
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}
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