125 lines
3.8 KiB
C++
125 lines
3.8 KiB
C++
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/*
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Copyright (c) 2016, Steven Siloti
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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/ip_notifier.hpp"
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#if defined TORRENT_WINDOWS && !defined TORRENT_BUILD_SIMULATOR
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#include <iphlpapi.h>
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#endif
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using namespace std::placeholders;
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namespace libtorrent
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{
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ip_change_notifier::ip_change_notifier(io_service& ios)
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#if defined TORRENT_BUILD_SIMULATOR
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#elif TORRENT_USE_NETLINK
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: m_socket(ios
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, netlink::endpoint(netlink(NETLINK_ROUTE), RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR))
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#elif defined TORRENT_WINDOWS
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: m_hnd(ios, WSACreateEvent())
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#endif
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{
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#if defined TORRENT_BUILD_SIMULATOR
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TORRENT_UNUSED(ios);
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#elif defined TORRENT_WINDOWS
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if (!m_hnd.is_open())
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throw system_error(WSAGetLastError(), system_category());
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m_ovl.hEvent = m_hnd.native_handle();
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#elif !TORRENT_USE_NETLINK
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TORRENT_UNUSED(ios);
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#endif
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}
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ip_change_notifier::~ip_change_notifier()
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{
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#if defined TORRENT_WINDOWS && !defined TORRENT_BUILD_SIMULATOR
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cancel();
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m_hnd.close();
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#endif
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}
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void ip_change_notifier::async_wait(std::function<void(error_code const&)> cb)
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{
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#if defined TORRENT_BUILD_SIMULATOR
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TORRENT_UNUSED(cb);
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#elif TORRENT_USE_NETLINK
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m_socket.async_receive(boost::asio::buffer(m_buf)
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, std::bind(&ip_change_notifier::on_notify, this, _1, _2, cb));
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#elif defined TORRENT_WINDOWS
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HANDLE hnd;
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DWORD err = NotifyAddrChange(&hnd, &m_ovl);
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if (err == ERROR_IO_PENDING)
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{
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m_hnd.async_wait([this,cb](error_code const& ec) { on_notify(ec, 0, cb); });
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}
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else
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{
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m_hnd.get_io_service().post([this,cb,err]()
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{ cb(error_code(err, system_category())); });
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}
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#else
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TORRENT_UNUSED(cb);
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#endif
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}
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void ip_change_notifier::cancel()
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{
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#if defined TORRENT_BUILD_SIMULATOR
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#elif TORRENT_USE_NETLINK
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m_socket.cancel();
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#elif defined TORRENT_WINDOWS
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CancelIPChangeNotify(&m_ovl);
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m_hnd.cancel();
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#endif
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}
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void ip_change_notifier::on_notify(error_code const& ec
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, std::size_t bytes_transferred
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, std::function<void(error_code const&)> cb)
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{
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TORRENT_UNUSED(bytes_transferred);
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// on linux we could parse the message to get information about the
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// change but Windows requires the application to enumerate the
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// interfaces after a notification so do that for Linux as well to
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// minimize the difference between platforms
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// Linux can generate ENOBUFS if the socket's buffers are full
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// don't treat it as an error
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if (ec.value() == boost::system::errc::no_buffer_space)
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cb(error_code());
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else
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cb(ec);
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}
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}
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