525 lines
14 KiB
C++
525 lines
14 KiB
C++
/*
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Copyright (c) 2003, 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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#include <vector>
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#include <cctype>
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#include <algorithm>
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#include "libtorrent/config.hpp"
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#include "libtorrent/gzip.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/bind.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/tracker_manager.hpp"
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#include "libtorrent/http_tracker_connection.hpp"
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#include "libtorrent/http_connection.hpp"
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#include "libtorrent/entry.hpp"
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#include "libtorrent/bencode.hpp"
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#include "libtorrent/torrent.hpp"
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#include "libtorrent/io.hpp"
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#include "libtorrent/socket.hpp"
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#include "libtorrent/aux_/session_impl.hpp"
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using namespace libtorrent;
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using boost::bind;
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namespace libtorrent
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{
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http_tracker_connection::http_tracker_connection(
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io_service& ios
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, connection_queue& cc
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, tracker_manager& man
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, tracker_request const& req
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, boost::weak_ptr<request_callback> c
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, aux::session_impl const& ses
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, proxy_settings const& ps
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, std::string const& auth
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#if TORRENT_USE_I2P
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, i2p_connection* i2p_conn
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#endif
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)
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: tracker_connection(man, req, ios, c)
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, m_man(man)
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, m_ses(ses)
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, m_ps(ps)
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, m_cc(cc)
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, m_ios(ios)
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#if TORRENT_USE_I2P
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, m_i2p_conn(i2p_conn)
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#endif
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{}
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void http_tracker_connection::start()
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{
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// TODO: authentication
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std::string url = tracker_req().url;
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if (tracker_req().kind == tracker_request::scrape_request)
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{
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// find and replace "announce" with "scrape"
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// in request
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std::size_t pos = url.find("announce");
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if (pos == std::string::npos)
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{
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m_ios.post(boost::bind(&http_tracker_connection::fail_disp, self()
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, -1, "scrape is not available on url: '" + tracker_req().url +"'"));
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return;
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}
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url.replace(pos, 8, "scrape");
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}
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#if TORRENT_USE_I2P
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// defined in torrent_info.cpp
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bool is_i2p_url(std::string const& url);
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bool i2p = is_i2p_url(url);
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#else
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static const bool i2p = false;
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#endif
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session_settings const& settings = m_ses.settings();
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// if request-string already contains
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// some parameters, append an ampersand instead
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// of a question mark
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size_t arguments_start = url.find('?');
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if (arguments_start != std::string::npos)
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url += "&";
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else
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url += "?";
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url += "info_hash=";
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url += escape_string((const char*)&tracker_req().info_hash[0], 20);
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if (tracker_req().kind == tracker_request::announce_request)
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{
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char str[1024];
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snprintf(str, sizeof(str), "&peer_id=%s&port=%d&uploaded=%lld"
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"&downloaded=%lld&left=%lld&compact=1&numwant=%d&key=%x&no_peer_id=1"
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#ifndef TORRENT_DISABLE_ENCRYPTION
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"%s"
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#endif
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, escape_string((const char*)&tracker_req().pid[0], 20).c_str()
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// the i2p tracker seems to verify that the port is not 0,
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// even though it ignores it otherwise
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, i2p ? 1 : tracker_req().listen_port
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, tracker_req().uploaded
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, tracker_req().downloaded
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, tracker_req().left
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, tracker_req().num_want
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, tracker_req().key
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#ifndef TORRENT_DISABLE_ENCRYPTION
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, m_ses.get_pe_settings().in_enc_policy == pe_settings::disabled
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? "" : "&supportcrypto=1"
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#endif
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);
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url += str;
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if (tracker_req().event != tracker_request::none)
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{
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const char* event_string[] = {"completed", "started", "stopped"};
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url += "&event=";
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url += event_string[tracker_req().event - 1];
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}
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#if TORRENT_USE_I2P
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if (i2p)
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{
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url += "&ip=";
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url += escape_string(m_i2p_conn->local_endpoint().c_str()
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, m_i2p_conn->local_endpoint().size());
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url += ".i2p";
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}
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else
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#endif
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if (settings.announce_ip != address())
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{
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error_code ec;
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std::string ip = settings.announce_ip.to_string(ec);
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if (!ec) url += "&ip=" + ip;
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}
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if (!tracker_req().ipv6.empty() && !i2p)
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{
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url += "&ipv6=";
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url += tracker_req().ipv6;
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}
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if (!tracker_req().ipv4.empty() && !i2p)
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{
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url += "&ipv4=";
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url += tracker_req().ipv4;
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}
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}
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m_tracker_connection.reset(new http_connection(m_ios, m_cc
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, boost::bind(&http_tracker_connection::on_response, self(), _1, _2, _3, _4)
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, true
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, boost::bind(&http_tracker_connection::on_connect, self(), _1)
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, boost::bind(&http_tracker_connection::on_filter, self(), _1, _2)));
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int timeout = tracker_req().event==tracker_request::stopped
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?settings.stop_tracker_timeout
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:settings.tracker_completion_timeout;
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m_tracker_connection->get(url, seconds(timeout)
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, 1, &m_ps, 5, settings.user_agent, bind_interface()
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#if TORRENT_USE_I2P
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, m_i2p_conn
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#endif
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);
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// the url + 100 estimated header size
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sent_bytes(url.size() + 100);
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#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
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boost::shared_ptr<request_callback> cb = requester();
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if (cb)
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{
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cb->debug_log("==> TRACKER_REQUEST [ url: " + url + " ]");
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}
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#endif
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}
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void http_tracker_connection::close()
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{
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if (m_tracker_connection)
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{
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m_tracker_connection->close();
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m_tracker_connection.reset();
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}
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tracker_connection::close();
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}
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void http_tracker_connection::on_filter(http_connection& c, std::list<tcp::endpoint>& endpoints)
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{
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// remove endpoints that are filtered by the IP filter
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for (std::list<tcp::endpoint>::iterator i = endpoints.begin();
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i != endpoints.end();)
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{
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if (m_ses.m_ip_filter.access(i->address()) == ip_filter::blocked)
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i = endpoints.erase(i);
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else
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++i;
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}
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if (endpoints.empty())
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fail(-1, "blocked by IP filter");
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}
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void http_tracker_connection::on_connect(http_connection& c)
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{
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error_code ec;
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tcp::endpoint ep = c.socket().remote_endpoint(ec);
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m_tracker_ip = ep.address();
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boost::shared_ptr<request_callback> cb = requester();
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if (cb) cb->m_tracker_address = ep;
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}
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void http_tracker_connection::on_response(error_code const& ec
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, http_parser const& parser, char const* data, int size)
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{
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// keep this alive
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boost::intrusive_ptr<http_tracker_connection> me(this);
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if (ec && ec != asio::error::eof)
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{
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fail(-1, ec.message().c_str());
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return;
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}
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if (!parser.header_finished())
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{
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fail(-1, "premature end of file");
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return;
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}
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if (parser.status_code() != 200)
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{
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fail(parser.status_code(), parser.message().c_str());
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return;
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}
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if (ec && ec != asio::error::eof)
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{
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fail(parser.status_code(), ec.message().c_str());
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return;
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}
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received_bytes(size + parser.body_start());
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// handle tracker response
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entry e;
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e = bdecode(data, data + size);
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if (e.type() == entry::dictionary_t)
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{
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parse(parser.status_code(), e);
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}
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else
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{
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std::string error_str("invalid bencoding of tracker response: \"");
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for (char const* i = data, *end(data + size); i != end; ++i)
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{
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if (*i >= ' ' && *i <= '~') error_str += *i;
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else error_str += "0x" + boost::lexical_cast<std::string>((unsigned int)*i) + " ";
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}
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error_str += "\"";
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fail(parser.status_code(), error_str.c_str());
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}
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close();
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}
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bool http_tracker_connection::extract_peer_info(const entry& info, peer_entry& ret)
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{
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// extract peer id (if any)
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if (info.type() != entry::dictionary_t)
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{
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fail(-1, "invalid response from tracker (invalid peer entry)");
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return false;
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}
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entry const* i = info.find_key("peer id");
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if (i != 0)
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{
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if (i->type() != entry::string_t || i->string().length() != 20)
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{
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fail(-1, "invalid response from tracker (invalid peer id)");
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return false;
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}
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std::copy(i->string().begin(), i->string().end(), ret.pid.begin());
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}
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else
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{
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// if there's no peer_id, just initialize it to a bunch of zeroes
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std::fill_n(ret.pid.begin(), 20, 0);
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}
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// extract ip
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i = info.find_key("ip");
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if (i == 0 || i->type() != entry::string_t)
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{
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fail(-1, "invalid response from tracker");
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return false;
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}
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ret.ip = i->string();
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// extract port
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i = info.find_key("port");
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if (i == 0 || i->type() != entry::int_t)
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{
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fail(-1, "invalid response from tracker");
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return false;
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}
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ret.port = (unsigned short)i->integer();
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return true;
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}
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void http_tracker_connection::parse(int status_code, entry const& e)
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{
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boost::shared_ptr<request_callback> cb = requester();
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if (!cb) return;
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// parse the response
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entry const* failure = e.find_key("failure reason");
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if (failure && failure->type() == entry::string_t)
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{
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fail(status_code, failure->string().c_str());
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return;
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}
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entry const* warning = e.find_key("warning message");
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if (warning && warning->type() == entry::string_t)
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{
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cb->tracker_warning(tracker_req(), warning->string());
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}
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std::vector<peer_entry> peer_list;
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if (tracker_req().kind == tracker_request::scrape_request)
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{
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std::string ih = tracker_req().info_hash.to_string();
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entry const* files = e.find_key("files");
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if (files == 0 || files->type() != entry::dictionary_t)
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{
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fail(-1, "invalid or missing 'files' entry in scrape response");
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return;
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}
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entry const* scrape_data = files->find_key(ih);
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if (scrape_data == 0 || scrape_data->type() != entry::dictionary_t)
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{
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fail(-1, "missing or invalid info-hash entry in scrape response");
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return;
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}
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entry const* complete = scrape_data->find_key("complete");
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entry const* incomplete = scrape_data->find_key("incomplete");
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entry const* downloaded = scrape_data->find_key("downloaded");
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if (complete == 0 || incomplete == 0 || downloaded == 0
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|| complete->type() != entry::int_t
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|| incomplete->type() != entry::int_t
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|| downloaded->type() != entry::int_t)
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{
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fail(-1, "missing 'complete' or 'incomplete' entries in scrape response");
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return;
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}
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cb->tracker_scrape_response(tracker_req(), int(complete->integer())
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, int(incomplete->integer()), int(downloaded->integer()));
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return;
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}
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entry const* interval = e.find_key("interval");
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if (interval == 0 || interval->type() != entry::int_t)
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{
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fail(-1, "missing or invalid 'interval' entry in tracker response");
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return;
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}
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entry const* peers_ent = e.find_key("peers");
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if (peers_ent && peers_ent->type() == entry::string_t)
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{
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std::string const& peers = peers_ent->string();
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for (std::string::const_iterator i = peers.begin();
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i != peers.end();)
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{
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if (std::distance(i, peers.end()) < 6) break;
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peer_entry p;
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p.pid.clear();
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error_code ec;
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p.ip = detail::read_v4_address(i).to_string(ec);
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if (ec) continue;
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p.port = detail::read_uint16(i);
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peer_list.push_back(p);
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}
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}
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else if (peers_ent && peers_ent->type() == entry::list_t)
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{
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entry::list_type const& l = peers_ent->list();
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for(entry::list_type::const_iterator i = l.begin(); i != l.end(); ++i)
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{
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peer_entry p;
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if (!extract_peer_info(*i, p)) return;
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peer_list.push_back(p);
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}
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}
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else
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{
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peers_ent = 0;
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}
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#if TORRENT_USE_IPV6
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entry const* ipv6_peers = e.find_key("peers6");
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if (ipv6_peers && ipv6_peers->type() == entry::string_t)
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{
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std::string const& peers = ipv6_peers->string();
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for (std::string::const_iterator i = peers.begin();
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i != peers.end();)
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{
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if (std::distance(i, peers.end()) < 18) break;
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peer_entry p;
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p.pid.clear();
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error_code ec;
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p.ip = detail::read_v6_address(i).to_string(ec);
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if (ec) continue;
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p.port = detail::read_uint16(i);
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peer_list.push_back(p);
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}
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}
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else
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{
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ipv6_peers = 0;
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}
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#else
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entry const* ipv6_peers = 0;
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#endif
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if (peers_ent == 0 && ipv6_peers == 0)
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{
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fail(-1, "missing 'peers' and 'peers6' entry in tracker response");
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return;
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}
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// look for optional scrape info
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int complete = -1;
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int incomplete = -1;
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address external_ip;
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entry const* ip_ent = e.find_key("external ip");
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if (ip_ent && ip_ent->type() == entry::string_t)
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{
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std::string const& ip = ip_ent->string();
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char const* p = &ip[0];
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if (ip.size() == address_v4::bytes_type::static_size)
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external_ip = detail::read_v4_address(p);
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#if TORRENT_USE_IPV6
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else if (ip.size() == address_v6::bytes_type::static_size)
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external_ip = detail::read_v6_address(p);
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#endif
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}
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entry const* complete_ent = e.find_key("complete");
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if (complete_ent && complete_ent->type() == entry::int_t)
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complete = int(complete_ent->integer());
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entry const* incomplete_ent = e.find_key("incomplete");
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if (incomplete_ent && incomplete_ent->type() == entry::int_t)
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incomplete = int(incomplete_ent->integer());
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std::list<address> ip_list;
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std::transform(m_tracker_connection->endpoints().begin()
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, m_tracker_connection->endpoints().end()
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, std::back_inserter(ip_list)
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, boost::bind(&tcp::endpoint::address, _1));
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cb->tracker_response(tracker_req(), m_tracker_ip, ip_list, peer_list
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, interval->integer(), complete, incomplete, external_ip);
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}
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}
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