221 lines
6.3 KiB
C++
221 lines
6.3 KiB
C++
/*
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Copyright (c) 2014, 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 "libtorrent/socket_io.hpp"
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#include "libtorrent/io.hpp"
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#include "udp_tracker.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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#if defined TORRENT_DEBUG && TORRENT_USE_IOSTREAM
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#include <iostream>
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#endif
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using namespace libtorrent;
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struct udp_tracker
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{
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boost::asio::io_service m_ios;
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boost::detail::atomic_count m_udp_announces;
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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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void on_udp_receive(error_code const& ec, size_t bytes_transferred, udp::endpoint* from, char* buffer, int size)
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{
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if (ec)
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{
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fprintf(stderr, "%s: UDP tracker, read failed: %s\n", time_now_string(), ec.message().c_str());
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return;
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}
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if (bytes_transferred < 16)
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{
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fprintf(stderr, "%s: UDP message too short (from: %s)\n", time_now_string(), print_endpoint(*from).c_str());
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return;
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}
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fprintf(stderr, "%s: UDP message %d bytes\n", time_now_string(), int(bytes_transferred));
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char* ptr = buffer;
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detail::read_uint64(ptr);
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boost::uint32_t action = detail::read_uint32(ptr);
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boost::uint32_t transaction_id = detail::read_uint32(ptr);
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error_code e;
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switch (action)
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{
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case 0: // connect
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fprintf(stderr, "%s: UDP connect from %s\n", time_now_string(), print_endpoint(*from).c_str());
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ptr = buffer;
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detail::write_uint32(0, ptr); // action = connect
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detail::write_uint32(transaction_id, ptr); // transaction_id
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detail::write_uint64(10, ptr); // connection_id
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m_socket.send_to(asio::buffer(buffer, 16), *from, 0, e);
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if (e) fprintf(stderr, "%s: send_to failed. ERROR: %s\n", time_now_string(), e.message().c_str());
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break;
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case 1: // announce
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++m_udp_announces;
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fprintf(stderr, "%s: UDP announce [%d]\n", time_now_string(), int(m_udp_announces));
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ptr = buffer;
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detail::write_uint32(1, ptr); // action = announce
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detail::write_uint32(transaction_id, ptr); // transaction_id
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detail::write_uint32(1800, ptr); // interval
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detail::write_uint32(1, ptr); // incomplete
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detail::write_uint32(1, ptr); // complete
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// 0 peers
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m_socket.send_to(asio::buffer(buffer, 20), *from, 0, e);
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if (e) fprintf(stderr, "%s: send_to failed. ERROR: %s\n", time_now_string(), e.message().c_str());
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break;
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case 2:
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// ignore scrapes
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fprintf(stderr, "%s: UDP scrape\n", time_now_string());
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break;
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default:
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fprintf(stderr, "%s: UDP unknown message: %d\n", time_now_string(), action);
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break;
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}
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m_socket.async_receive_from(
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asio::buffer(buffer, size), *from, 0
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, boost::bind(&udp_tracker::on_udp_receive, this, _1, _2, from, buffer, size));
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}
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udp_tracker()
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: m_udp_announces(0)
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, m_socket(m_ios)
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, m_port(0)
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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 UDP tracker 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 UDP tracker 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 UDP tracker socket: %s\n", ec.message().c_str());
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return;
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}
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fprintf(stderr, "%s: UDP tracker initialized on port %d\n", time_now_string(), m_port);
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m_thread.reset(new thread(boost::bind(&udp_tracker::thread_fun, this)));
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}
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~udp_tracker()
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{
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m_socket.cancel();
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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_udp_announces; }
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static void incoming_packet(error_code const& ec, size_t bytes_transferred, size_t *ret, error_code* error, bool* done)
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{
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*ret = bytes_transferred;
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*error = ec;
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*done = true;
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}
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void thread_fun()
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{
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char buffer[2000];
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error_code ec;
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udp::endpoint from;
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m_socket.async_receive_from(
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asio::buffer(buffer, sizeof(buffer)), from, 0
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, boost::bind(&udp_tracker::on_udp_receive, this, _1, _2, &from, &buffer[0], sizeof(buffer)));
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m_ios.run(ec);
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if (ec)
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{
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fprintf(stderr, "Error running UDP tracker service: %s\n", ec.message().c_str());
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return;
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}
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fprintf(stderr, "exiting UDP tracker thread\n");
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}
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};
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boost::shared_ptr<udp_tracker> g_udp_tracker;
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int start_udp_tracker()
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{
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g_udp_tracker.reset(new udp_tracker);
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return g_udp_tracker->port();
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}
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// the number of UDP tracker announces received
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int num_udp_announces()
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{
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if (g_udp_tracker) return g_udp_tracker->num_hits();
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return 0;
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}
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void stop_udp_tracker()
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{
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fprintf(stderr, "%s: stop_udp_tracker()\n", time_now_string());
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g_udp_tracker.reset();
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fprintf(stderr, "%s: stop_udp_tracker() done\n", time_now_string());
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}
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