src/tracker_manager.cpp

   1 /*
   2
   3 Copyright (c) 2003, Arvid Norberg
   4 All rights reserved.
   5
   6 Redistribution and use in source and binary forms, with or without
   7 modification, are permitted provided that the following conditions
   8 are met:
   9
  10     * Redistributions of source code must retain the above copyright
  11       notice, this list of conditions and the following disclaimer.
  12     * Redistributions in binary form must reproduce the above copyright
  13       notice, this list of conditions and the following disclaimer in
  14       the documentation and/or other materials provided with the distribution.
  15     * Neither the name of the author nor the names of its
  16       contributors may be used to endorse or promote products derived
  17       from this software without specific prior written permission.
  18
  19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  23 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29 POSSIBILITY OF SUCH DAMAGE.
  30
  31 */
  32
  33 #include "libtorrent/pch.hpp"
  34
  35 #include <vector>
  36 #include <iostream>
  37 #include <cctype>
  38 #include <iomanip>
  39 #include <sstream>
  40
  41 #include <boost/bind.hpp>
  42
  43 #include "libtorrent/tracker_manager.hpp"
  44 #include "libtorrent/http_tracker_connection.hpp"
  45 #include "libtorrent/udp_tracker_connection.hpp"
  46 #include "libtorrent/entry.hpp"
  47 #include "libtorrent/bencode.hpp"
  48 #include "libtorrent/torrent.hpp"
  49 #include "libtorrent/peer_connection.hpp"
  50
  51 using namespace libtorrent;
  52 using boost::tuples::make_tuple;
  53 using boost::tuples::tuple;
  54 using boost::bind;
  55
  56 namespace
  57 {
  58         enum
  59         {
  60                 minimum_tracker_response_length = 3,
  61                 http_buffer_size = 2048
  62         };
  63
  64 }
  65
  66 namespace libtorrent
  67 {
  68         timeout_handler::timeout_handler(io_service& ios)
  69                 : m_start_time(time_now())
  70                 , m_read_time(time_now())
  71                 , m_timeout(ios)
  72                 , m_completion_timeout(0)
  73                 , m_read_timeout(0)
  74                 , m_abort(false)
  75         {}
  76
  77         void timeout_handler::set_timeout(int completion_timeout, int read_timeout)
  78         {
  79                 m_completion_timeout = completion_timeout;
  80                 m_read_timeout = read_timeout;
  81                 m_start_time = m_read_time = time_now();
  82
  83                 if (m_abort) return;
  84
  85                 int timeout = (std::min)(
  86                         m_read_timeout, (std::min)(m_completion_timeout, m_read_timeout));
  87                 error_code ec;
  88                 m_timeout.expires_at(m_read_time + seconds(timeout), ec);
  89                 m_timeout.async_wait(bind(
  90                         &timeout_handler::timeout_callback, self(), _1));
  91         }
  92
  93         void timeout_handler::restart_read_timeout()
  94         {
  95                 m_read_time = time_now();
  96         }
  97
  98         void timeout_handler::cancel()
  99         {
 100                 m_abort = true;
 101                 m_completion_timeout = 0;
 102                 error_code ec;
 103                 m_timeout.cancel(ec);
 104         }
 105
 106         void timeout_handler::timeout_callback(error_code const& error)
 107         {
 108                 if (error) return;
 109                 if (m_completion_timeout == 0) return;
 110
 111                 ptime now(time_now());
 112                 time_duration receive_timeout = now - m_read_time;
 113                 time_duration completion_timeout = now - m_start_time;
 114
 115                 if (m_read_timeout
 116                         < total_seconds(receive_timeout)
 117                         || m_completion_timeout
 118                         < total_seconds(completion_timeout))
 119                 {
 120                         on_timeout();
 121                         return;
 122                 }
 123
 124                 if (m_abort) return;
 125
 126                 int timeout = (std::min)(
 127                         m_read_timeout, (std::min)(m_completion_timeout, m_read_timeout));
 128                 error_code ec;
 129                 m_timeout.expires_at(m_read_time + seconds(timeout), ec);
 130                 m_timeout.async_wait(
 131                         bind(&timeout_handler::timeout_callback, self(), _1));
 132         }
 133
 134         tracker_connection::tracker_connection(
 135                 tracker_manager& man
 136                 , tracker_request const& req
 137                 , io_service& ios
 138                 , address bind_interface_
 139                 , boost::weak_ptr<request_callback> r)
 140                 : timeout_handler(ios)
 141                 , m_requester(r)
 142                 , m_bind_interface(bind_interface_)
 143                 , m_man(man)
 144                 , m_req(req)
 145         {}
 146
 147         boost::shared_ptr<request_callback> tracker_connection::requester()
 148         {
 149                 return m_requester.lock();
 150         }
 151
 152         void tracker_connection::fail(int code, char const* msg)
 153         {
 154                 boost::shared_ptr<request_callback> cb = requester();
 155                 if (cb) cb->tracker_request_error(m_req, code, msg);
 156                 close();
 157         }
 158
 159         void tracker_connection::fail_timeout()
 160         {
 161                 boost::shared_ptr<request_callback> cb = requester();
 162                 if (cb) cb->tracker_request_timed_out(m_req);
 163                 close();
 164         }
 165
 166         void tracker_connection::close()
 167         {
 168                 cancel();
 169                 m_man.remove_request(this);
 170         }
 171
 172         void tracker_manager::remove_request(tracker_connection const* c)
 173         {
 174                 mutex_t::scoped_lock l(m_mutex);
 175
 176                 tracker_connections_t::iterator i = std::find(m_connections.begin()
 177                         , m_connections.end(), boost::intrusive_ptr<const tracker_connection>(c));
 178                 if (i == m_connections.end()) return;
 179
 180                 m_connections.erase(i);
 181         }
 182
 183         void tracker_manager::queue_request(
 184                 io_service& ios
 185                 , connection_queue& cc
 186                 , tracker_request req
 187                 , std::string const& auth
 188                 , address bind_infc
 189                 , boost::weak_ptr<request_callback> c)
 190         {
 191                 mutex_t::scoped_lock l(m_mutex);
 192                 TORRENT_ASSERT(req.num_want >= 0);
 193                 if (req.event == tracker_request::stopped)
 194                         req.num_want = 0;
 195
 196                 TORRENT_ASSERT(!m_abort || req.event == tracker_request::stopped);
 197                 if (m_abort && req.event != tracker_request::stopped)
 198                         return;
 199
 200                 std::string protocol = req.url.substr(0, req.url.find(':'));
 201
 202                 boost::intrusive_ptr<tracker_connection> con;
 203
 204 #ifdef TORRENT_USE_OPENSSL
 205                 if (protocol == "http" || protocol == "https")
 206 #else
 207                 if (protocol == "http")
 208 #endif
 209                 {
 210                         con = new http_tracker_connection(
 211                                 ios, cc, *this, req, bind_infc, c
 212                                 , m_settings, m_proxy, auth);
 213                 }
 214                 else if (protocol == "udp")
 215                 {
 216                         con = new udp_tracker_connection(
 217                                 ios, cc, *this, req, bind_infc
 218                                 , c, m_settings, m_proxy);
 219                 }
 220                 else
 221                 {
 222                         if (boost::shared_ptr<request_callback> r = c.lock())
 223                                 r->tracker_request_error(req, -1, "unknown protocol in tracker url: "
 224                                         + req.url);
 225                         return;
 226                 }
 227
 228                 m_connections.push_back(con);
 229
 230                 boost::shared_ptr<request_callback> cb = con->requester();
 231                 if (cb) cb->m_manager = this;
 232         }
 233
 234         void tracker_manager::abort_all_requests()
 235         {
 236                 // removes all connections from m_connections
 237                 // except those with a requester == 0 (since those are
 238                 // 'event=stopped'-requests)
 239                 mutex_t::scoped_lock l(m_mutex);
 240
 241                 m_abort = true;
 242                 tracker_connections_t keep_connections;
 243
 244                 while (!m_connections.empty())
 245                 {
 246                         boost::intrusive_ptr<tracker_connection>& c = m_connections.back();
 247                         if (!c)
 248                         {
 249                                 m_connections.pop_back();
 250                                 continue;
 251                         }
 252                         tracker_request const& req = c->tracker_req();
 253                         if (req.event == tracker_request::stopped)
 254                         {
 255                                 keep_connections.push_back(c);
 256                                 m_connections.pop_back();
 257                                 continue;
 258                         }
 259                         // close will remove the entry from m_connections
 260                         // so no need to pop
 261
 262 #if defined TORRENT_VERBOSE_LOGGING || defined TORRENT_LOGGING || defined TORRENT_ERROR_LOGGING
 263                         boost::shared_ptr<request_callback> rc = c->requester();
 264                         if (rc) rc->debug_log("aborting: " + req.url);
 265 #endif
 266                         c->close();
 267                 }
 268
 269                 std::swap(m_connections, keep_connections);
 270         }
 271
 272         bool tracker_manager::empty() const
 273         {
 274                 mutex_t::scoped_lock l(m_mutex);
 275                 return m_connections.empty();
 276         }
 277
 278         int tracker_manager::num_requests() const
 279         {
 280                 mutex_t::scoped_lock l(m_mutex);
 281                 return m_connections.size();
 282         }
 283 }