/* Copyright (c) 2007, Arvid Norberg All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "libtorrent/pch.hpp" #include "libtorrent/lsd.hpp" #include "libtorrent/io.hpp" #include "libtorrent/http_tracker_connection.hpp" #include "libtorrent/buffer.hpp" #include "libtorrent/http_parser.hpp" #include "libtorrent/escape_string.hpp" #include "libtorrent/socket_io.hpp" // for print_address #include #include #if BOOST_VERSION < 103500 #include #include #else #include #include #endif #include #include using boost::bind; using namespace libtorrent; namespace libtorrent { // defined in broadcast_socket.cpp address guess_local_address(io_service&); } static error_code ec; lsd::lsd(io_service& ios, address const& listen_interface , peer_callback_t const& cb) : m_callback(cb) , m_retry_count(1) , m_socket(ios, udp::endpoint(address_v4::from_string("239.192.152.143", ec), 6771) , bind(&lsd::on_announce, self(), _1, _2, _3)) , m_broadcast_timer(ios) , m_disabled(false) { #if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING) m_log.open("lsd.log", std::ios::in | std::ios::out | std::ios::trunc); #endif } lsd::~lsd() {} void lsd::announce(sha1_hash const& ih, int listen_port) { if (m_disabled) return; char ih_hex[41]; to_hex((char const*)&ih[0], 20, ih_hex); char msg[200]; int msg_len = snprintf(msg, sizeof(msg), "BT-SEARCH * HTTP/1.1\r\n" "Host: 239.192.152.143:6771\r\n" "Port: %d\r\n" "Infohash: %s\r\n" "\r\n\r\n", listen_port, ih_hex); m_retry_count = 1; error_code ec; m_socket.send(msg, msg_len, ec); if (ec) { m_disabled = true; return; } #if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING) { char msg[200]; snprintf(msg, sizeof(msg), "%s ==> announce: ih: %s port: %u" , time_now_string(), ih_hex, listen_port); m_log << msg << std::endl; } #endif m_broadcast_timer.expires_from_now(milliseconds(250 * m_retry_count), ec); m_broadcast_timer.async_wait(boost::bind(&lsd::resend_announce, self(), _1 , std::string(msg))); } void lsd::resend_announce(error_code const& e, std::string msg) { if (e) return; error_code ec; m_socket.send(msg.c_str(), int(msg.size()), ec); ++m_retry_count; if (m_retry_count >= 5) return; m_broadcast_timer.expires_from_now(milliseconds(250 * m_retry_count), ec); m_broadcast_timer.async_wait(boost::bind(&lsd::resend_announce, self(), _1, msg)); } void lsd::on_announce(udp::endpoint const& from, char* buffer , std::size_t bytes_transferred) { using namespace libtorrent::detail; http_parser p; bool error = false; p.incoming(buffer::const_interval(buffer, buffer + bytes_transferred) , error); if (!p.header_finished() || error) { #if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING) m_log << time_now_string() << " <== announce: incomplete HTTP message" << std::endl; #endif return; } if (p.method() != "bt-search") { #if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING) m_log << time_now_string() << " <== announce: invalid HTTP method: " << p.method() << std::endl; #endif return; } std::string const& port_str = p.header("port"); if (port_str.empty()) { #if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING) m_log << time_now_string() << " <== announce: invalid BT-SEARCH, missing port" << std::endl; #endif return; } std::string const& ih_str = p.header("infohash"); if (ih_str.empty()) { #if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING) m_log << time_now_string() << " <== announce: invalid BT-SEARCH, missing infohash" << std::endl; #endif return; } sha1_hash ih(0); from_hex(ih_str.c_str(), 40, (char*)&ih[0]); int port = std::atoi(port_str.c_str()); if (!ih.is_all_zeros() && port != 0) { #if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING) char msg[200]; snprintf(msg, 200, "%s *** incoming local announce %s:%d ih: %s\n" , time_now_string(), print_address(from.address()).c_str() , port, ih_str.c_str()); #endif // we got an announce, pass it on through the callback #ifndef BOOST_NO_EXCEPTIONS try { #endif m_callback(tcp::endpoint(from.address(), port), ih); #ifndef BOOST_NO_EXCEPTIONS } catch (std::exception&) {} #endif } } void lsd::close() { m_socket.close(); error_code ec; m_broadcast_timer.cancel(ec); m_disabled = true; m_callback.clear(); }