95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
/*
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Copyright (c) 2013-2018, 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_RESOLVER_HPP_INCLUDE
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#define TORRENT_RESOLVER_HPP_INCLUDE
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#include <boost/asio/ip/tcp.hpp>
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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#include <unordered_map>
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#include <vector>
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#include "libtorrent/error_code.hpp"
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#include "libtorrent/io_service.hpp"
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#include "libtorrent/socket.hpp"
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#include "libtorrent/resolver_interface.hpp"
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#include "libtorrent/address.hpp"
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namespace libtorrent {
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struct TORRENT_EXTRA_EXPORT resolver final : resolver_interface
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{
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explicit resolver(io_service& ios);
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void async_resolve(std::string const& host, resolver_flags flags
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, callback_t const& h) override;
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void abort() override;
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void set_cache_timeout(seconds timeout) override;
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private:
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void on_lookup(error_code const& ec, tcp::resolver::iterator i
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, resolver_interface::callback_t const& h, std::string const& hostname);
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void callback(resolver_interface::callback_t const& h
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, error_code const& ec, std::vector<address> const& ips);
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struct dns_cache_entry
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{
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time_point last_seen;
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std::vector<address> addresses;
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};
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std::unordered_map<std::string, dns_cache_entry> m_cache;
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io_service& m_ios;
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// all lookups in this resolver are aborted on shutdown.
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tcp::resolver m_resolver;
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// lookups in this resolver are not aborted on shutdown
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tcp::resolver m_critical_resolver;
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// max number of cached entries
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int m_max_size;
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// timeout of cache entries
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time_duration m_timeout;
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};
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}
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#endif
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