360 lines
9.6 KiB
C++
360 lines
9.6 KiB
C++
/*
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Copyright (c) 2006, MassaRoddel, 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/pch.hpp"
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#ifdef _MSC_VER
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#pragma warning(push, 1)
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#endif
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#include <boost/shared_ptr.hpp>
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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#include "libtorrent/peer_connection.hpp"
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#include "libtorrent/bt_peer_connection.hpp"
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#include "libtorrent/bencode.hpp"
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#include "libtorrent/torrent.hpp"
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#include "libtorrent/extensions.hpp"
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#include "libtorrent/extensions/ut_pex.hpp"
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namespace libtorrent { namespace
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{
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const char extension_name[] = "ut_pex";
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enum
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{
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extension_index = 1,
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max_peer_entries = 100
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};
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bool send_peer(peer_connection const& p)
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{
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// don't send out peers that we haven't connected to
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// (that have connected to us)
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if (!p.is_local()) return false;
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// don't send out peers that we haven't successfully connected to
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if (p.is_connecting()) return false;
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// ut pex does not support IPv6
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if (!p.remote().address().is_v4()) return false;
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return true;
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}
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struct ut_pex_plugin: torrent_plugin
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{
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ut_pex_plugin(torrent& t): m_torrent(t), m_1_minute(0) {}
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virtual boost::shared_ptr<peer_plugin> new_connection(peer_connection* pc);
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std::vector<char>& get_ut_pex_msg()
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{
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return m_ut_pex_msg;
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}
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// the second tick of the torrent
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// each minute the new lists of "added" + "added.f" and "dropped"
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// are calculated here and the pex message is created
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// each peer connection will use this message
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// max_peer_entries limits the packet size
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virtual void tick()
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{
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if (++m_1_minute < 60) return;
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m_1_minute = 0;
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entry pex;
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std::string& pla = pex["added"].string();
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std::string& pld = pex["dropped"].string();
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std::string& plf = pex["added.f"].string();
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std::back_insert_iterator<std::string> pla_out(pla);
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std::back_insert_iterator<std::string> pld_out(pld);
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std::back_insert_iterator<std::string> plf_out(plf);
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std::set<tcp::endpoint> dropped;
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m_old_peers.swap(dropped);
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int num_added = 0;
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for (torrent::peer_iterator i = m_torrent.begin()
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, end(m_torrent.end()); i != end; ++i)
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{
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if (!send_peer(*i->second)) continue;
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m_old_peers.insert(i->first);
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std::set<tcp::endpoint>::iterator di = dropped.find(i->first);
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if (di == dropped.end())
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{
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// don't write too big of a package
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if (num_added >= max_peer_entries) break;
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// only send proper bittorrent peers
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bt_peer_connection* p = dynamic_cast<bt_peer_connection*>(i->second);
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if (!p) continue;
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// i->first was added since the last time
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detail::write_endpoint(i->first, pla_out);
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// no supported flags to set yet
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// 0x01 - peer supports encryption
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// 0x02 - peer is a seed
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int flags = p->is_seed() ? 2 : 0;
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#ifndef TORRENT_DISABLE_ENCRYPTION
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flags |= p->supports_encryption() ? 1 : 0;
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#endif
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detail::write_uint8(flags, plf_out);
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++num_added;
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}
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else
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{
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// this was in the previous message
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// so, it wasn't dropped
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dropped.erase(di);
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}
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}
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for (std::set<tcp::endpoint>::const_iterator i = dropped.begin()
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, end(dropped.end());i != end; ++i)
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{
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if (!i->address().is_v4()) continue;
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detail::write_endpoint(*i, pld_out);
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}
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m_ut_pex_msg.clear();
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bencode(std::back_inserter(m_ut_pex_msg), pex);
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}
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private:
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torrent& m_torrent;
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std::set<tcp::endpoint> m_old_peers;
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int m_1_minute;
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std::vector<char> m_ut_pex_msg;
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};
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struct ut_pex_peer_plugin : peer_plugin
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{
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ut_pex_peer_plugin(torrent& t, peer_connection& pc, ut_pex_plugin& tp)
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: m_torrent(t)
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, m_pc(pc)
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, m_tp(tp)
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, m_1_minute(0)
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, m_message_index(0)
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, m_first_time(true)
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{}
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virtual void add_handshake(entry& h)
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{
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entry& messages = h["m"];
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messages[extension_name] = extension_index;
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}
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virtual bool on_extension_handshake(entry const& h)
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{
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entry const& messages = h["m"];
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if (entry const* index = messages.find_key(extension_name))
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{
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m_message_index = index->integer();
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return true;
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}
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else
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{
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m_message_index = 0;
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return false;
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}
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}
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virtual bool on_extended(int length, int msg, buffer::const_interval body)
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try
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{
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if (msg != extension_index) return false;
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if (m_message_index == 0) return false;
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if (length > 500 * 1024)
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throw protocol_error("ut peer exchange message larger than 500 kB");
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if (body.left() < length) return true;
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entry pex_msg = bdecode(body.begin, body.end);
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std::string const& peers = pex_msg["added"].string();
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std::string const& peer_flags = pex_msg["added.f"].string();
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int num_peers = peers.length() / 6;
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char const* in = peers.c_str();
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char const* fin = peer_flags.c_str();
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if (int(peer_flags.size()) != num_peers)
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return true;
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peer_id pid(0);
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policy& p = m_torrent.get_policy();
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for (int i = 0; i < num_peers; ++i)
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{
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tcp::endpoint adr = detail::read_v4_endpoint<tcp::endpoint>(in);
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char flags = detail::read_uint8(fin);
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p.peer_from_tracker(adr, pid, peer_info::pex, flags);
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}
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return true;
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}
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catch (std::exception&)
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{
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return true;
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}
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// the peers second tick
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// every minute we send a pex message
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virtual void tick()
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{
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if (!m_message_index) return; // no handshake yet
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if (++m_1_minute <= 60) return;
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if (m_first_time)
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{
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send_ut_peer_list();
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m_first_time = false;
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}
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else
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{
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send_ut_peer_diff();
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}
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m_1_minute = 0;
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}
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private:
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void send_ut_peer_diff()
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{
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std::vector<char> const& pex_msg = m_tp.get_ut_pex_msg();
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buffer::interval i = m_pc.allocate_send_buffer(6 + pex_msg.size());
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detail::write_uint32(1 + 1 + pex_msg.size(), i.begin);
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detail::write_uint8(bt_peer_connection::msg_extended, i.begin);
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detail::write_uint8(m_message_index, i.begin);
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std::copy(pex_msg.begin(), pex_msg.end(), i.begin);
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i.begin += pex_msg.size();
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assert(i.begin == i.end);
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m_pc.setup_send();
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}
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void send_ut_peer_list()
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{
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entry pex;
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// leave the dropped string empty
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pex["dropped"].string();
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std::string& pla = pex["added"].string();
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std::string& plf = pex["added.f"].string();
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std::back_insert_iterator<std::string> pla_out(pla);
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std::back_insert_iterator<std::string> plf_out(plf);
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int num_added = 0;
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for (torrent::peer_iterator i = m_torrent.begin()
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, end(m_torrent.end()); i != end; ++i)
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{
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if (!send_peer(*i->second)) continue;
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// don't write too big of a package
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if (num_added >= max_peer_entries) break;
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// only send proper bittorrent peers
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bt_peer_connection* p = dynamic_cast<bt_peer_connection*>(i->second);
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if (!p) continue;
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// i->first was added since the last time
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detail::write_endpoint(i->first, pla_out);
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// no supported flags to set yet
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// 0x01 - peer supports encryption
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// 0x02 - peer is a seed
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int flags = p->is_seed() ? 2 : 0;
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#ifndef TORRENT_DISABLE_ENCRYPTION
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flags |= p->supports_encryption() ? 1 : 0;
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#endif
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detail::write_uint8(flags, plf_out);
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++num_added;
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}
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std::vector<char> pex_msg;
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bencode(std::back_inserter(pex_msg), pex);
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buffer::interval i = m_pc.allocate_send_buffer(6 + pex_msg.size());
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detail::write_uint32(1 + 1 + pex_msg.size(), i.begin);
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detail::write_uint8(bt_peer_connection::msg_extended, i.begin);
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detail::write_uint8(m_message_index, i.begin);
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std::copy(pex_msg.begin(), pex_msg.end(), i.begin);
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i.begin += pex_msg.size();
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assert(i.begin == i.end);
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m_pc.setup_send();
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}
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torrent& m_torrent;
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peer_connection& m_pc;
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ut_pex_plugin& m_tp;
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int m_1_minute;
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int m_message_index;
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// this is initialized to true, and set to
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// false after the first pex message has been sent.
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// it is used to know if a diff message or a full
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// message should be sent.
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bool m_first_time;
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};
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boost::shared_ptr<peer_plugin> ut_pex_plugin::new_connection(peer_connection* pc)
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{
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bt_peer_connection* c = dynamic_cast<bt_peer_connection*>(pc);
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if (!c) return boost::shared_ptr<peer_plugin>();
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return boost::shared_ptr<peer_plugin>(new ut_pex_peer_plugin(m_torrent
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, *pc, *this));
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}
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}}
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namespace libtorrent
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{
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boost::shared_ptr<torrent_plugin> create_ut_pex_plugin(torrent* t)
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{
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if (t->torrent_file().priv())
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{
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return boost::shared_ptr<torrent_plugin>();
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}
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return boost::shared_ptr<torrent_plugin>(new ut_pex_plugin(*t));
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}
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}
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