183 lines
4.5 KiB
C++
183 lines
4.5 KiB
C++
/*
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Copyright (c) 2006, Arvid Norberg & Daniel Wallin
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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 TRAVERSAL_ALGORITHM_050324_HPP
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#define TRAVERSAL_ALGORITHM_050324_HPP
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#include <vector>
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#include <set>
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#include <libtorrent/kademlia/node_id.hpp>
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#include <libtorrent/kademlia/routing_table.hpp>
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#include <libtorrent/kademlia/logging.hpp>
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#include <libtorrent/address.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/bind.hpp>
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#include <boost/pool/pool.hpp>
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namespace libtorrent { struct dht_lookup; }
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namespace libtorrent { namespace dht
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{
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#ifdef TORRENT_DHT_VERBOSE_LOGGING
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TORRENT_DECLARE_LOG(traversal);
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#endif
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class rpc_manager;
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class node_impl;
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// this class may not be instantiated as a stack object
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struct traversal_algorithm : boost::noncopyable
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{
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void traverse(node_id const& id, udp::endpoint addr);
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void finished(udp::endpoint const& ep);
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enum flags_t { prevent_request = 1, short_timeout = 2 };
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void failed(udp::endpoint const& ep, int flags = 0);
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virtual ~traversal_algorithm();
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boost::pool<>& allocator() const;
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void status(dht_lookup& l);
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virtual char const* name() const { return "traversal_algorithm"; }
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virtual void start();
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node_id const& target() const { return m_target; }
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void add_entry(node_id const& id, udp::endpoint addr, unsigned char flags);
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struct result
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{
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result(node_id const& id, udp::endpoint ep, unsigned char f = 0)
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: id(id), flags(f)
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{
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#if TORRENT_USE_IPV6
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if (ep.address().is_v6())
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{
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flags |= ipv6_address;
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addr.v6 = ep.address().to_v6().to_bytes();
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}
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else
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#endif
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{
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flags &= ~ipv6_address;
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addr.v4 = ep.address().to_v4().to_bytes();
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}
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port = ep.port();
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}
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udp::endpoint endpoint() const
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{
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#if TORRENT_USE_IPV6
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if (flags & ipv6_address)
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return udp::endpoint(address_v6(addr.v6), port);
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else
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#endif
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return udp::endpoint(address_v4(addr.v4), port);
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}
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node_id id;
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TORRENT_UNION addr_t
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{
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address_v4::bytes_type v4;
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#if TORRENT_USE_IPV6
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address_v6::bytes_type v6;
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#endif
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} addr;
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boost::uint16_t port;
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enum {
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queried = 1,
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initial = 2,
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no_id = 4,
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short_timeout = 8,
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failed = 16,
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ipv6_address = 32,
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alive = 64
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};
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unsigned char flags;
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};
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traversal_algorithm(
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node_impl& node
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, node_id target)
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: m_ref_count(0)
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, m_node(node)
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, m_target(target)
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, m_invoke_count(0)
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, m_branch_factor(3)
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, m_responses(0)
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, m_timeouts(0)
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{
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#ifdef TORRENT_DHT_VERBOSE_LOGGING
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TORRENT_LOG(traversal) << " [" << this << "] new traversal process. Target: " << target;
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#endif
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}
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protected:
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void add_requests();
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void add_router_entries();
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void init();
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virtual void done() {}
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virtual bool invoke(udp::endpoint addr) { return false; }
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friend void intrusive_ptr_add_ref(traversal_algorithm* p)
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{
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p->m_ref_count++;
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}
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friend void intrusive_ptr_release(traversal_algorithm* p)
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{
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if (--p->m_ref_count == 0)
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delete p;
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}
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int m_ref_count;
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node_impl& m_node;
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node_id m_target;
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std::vector<result> m_results;
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int m_invoke_count;
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int m_branch_factor;
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int m_responses;
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int m_timeouts;
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};
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} } // namespace libtorrent::dht
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#endif // TRAVERSAL_ALGORITHM_050324_HPP
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