2017-09-27 02:33:21 +01:00
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/*
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* Copyright © 2012-2017 Naim A.
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*
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* This file is part of UDPT.
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*
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* UDPT is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* UDPT is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with UDPT. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "udpTracker.hpp"
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#include "logging.hpp"
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using namespace UDPT::Data;
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#define UDP_BUFFER_SIZE 2048
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namespace UDPT
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{
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UDPTracker::UDPTracker(const boost::program_options::variables_map& conf) : m_conf(conf) {
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this->m_allowRemotes = conf["tracker.allow_remotes"].as<bool>();
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this->m_allowIANA_IPs = conf["tracker.allow_iana_ips"].as<bool>();
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this->m_isDynamic = conf["tracker.is_dynamic"].as<bool>();
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this->m_announceInterval = conf["tracker.announce_interval"].as<unsigned>();
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this->m_cleanupInterval = conf["tracker.cleanup_interval"].as<unsigned>();
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this->m_port = conf["tracker.port"].as<unsigned short>();
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this->m_threadCount = conf["tracker.threads"].as<unsigned>() + 1;
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this->m_localEndpoint.sin_family = AF_INET;
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this->m_localEndpoint.sin_port = m_hton16(m_port);
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this->m_localEndpoint.sin_addr.s_addr = 0L;
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this->m_conn = std::shared_ptr<DatabaseDriver>(new Data::SQLite3Driver(m_conf, this->m_isDynamic));
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}
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UDPTracker::~UDPTracker() {
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}
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void UDPTracker::start() {
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SOCKET sock;
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int r, // saves results
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i, // loop index
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yup; // just to set TRUE
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std::string dbname;// saves the Database name.
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sock = ::socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (sock == INVALID_SOCKET)
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{
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LOG_FATAL("udp-tracker", "Failed to create socket. error=" << errno);
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throw UDPT::UDPTException("Failed to create socket");
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}
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yup = 1;
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::setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&yup, 1);
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{
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// don't block recvfrom for too long.
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#if defined(linux)
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timeval timeout = { 0 };
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timeout.tv_sec = 5;
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#elif defined(WIN32)
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DWORD timeout = 5000;
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#else
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#error Unsupported OS.
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#endif
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::setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, reinterpret_cast<const char*>(&timeout), sizeof(timeout));
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}
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this->m_localEndpoint.sin_family = AF_INET;
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r = ::bind(sock, reinterpret_cast<SOCKADDR*>(&this->m_localEndpoint), sizeof(SOCKADDR_IN));
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if (r == SOCKET_ERROR)
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{
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LOG_FATAL("udp-tracker", "Failed to bind socket. error=" << errno);
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#ifdef WIN32
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::closesocket(sock);
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#elif defined (linux)
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::close(sock);
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#endif
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throw UDPT::UDPTException("Failed to bind socket.");
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}
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this->m_sock = sock;
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LOG_INFO("udp-tracker", "Tracker bound to " << inet_ntoa(this->m_localEndpoint.sin_addr));
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// create maintainer thread.
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m_threads.push_back(std::thread(UDPTracker::_maintainance_start, this));
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LOG_INFO("udp-tracker", "Started maintenance thread @" << m_threads.back().get_id());
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m_shouldRun = true;
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for (i = 1;i < this->m_threadCount; i++)
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{
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m_threads.push_back(std::thread(UDPTracker::_thread_start, this));
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LOG_INFO("udp-tracker", "Started worker thread @" << m_threads.back().get_id());
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}
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}
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void UDPTracker::stop() {
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// tell workers to stop running...
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m_shouldRun = false;
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// stop maintenance thread's sleep...
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m_maintenanceCondition.notify_one();
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}
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/**
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* @brief blocks until all threads die.
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* @note This method should be called only once, preferably by the main thread.
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* **/
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void UDPTracker::wait() {
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LOG_INFO("udp-tracker", "Waiting for threads to terminate...");
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for (std::vector<std::thread>::iterator it = m_threads.begin(); it != m_threads.end(); ++it)
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{
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it->join();
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}
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LOG_INFO("udp-tracker", "UDP Tracker terminated");
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#ifdef linux
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::close(m_sock);
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#elif defined (WIN32)
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::closesocket(m_sock);
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#endif
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}
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int UDPTracker::sendError(UDPTracker* usi, SOCKADDR_IN* remote, uint32_t transactionID, const std::string &msg) {
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struct udp_error_response error;
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int msg_sz, // message size to send.
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i; // copy loop
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char buff [1024]; // more than reasonable message size...
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error.action = m_hton32 (3);
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error.transaction_id = transactionID;
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error.message = (char*)msg.c_str();
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msg_sz = 4 + 4 + 1 + msg.length();
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// test against overflow message. resolves issue 4.
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if (msg_sz > 1024)
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return -1;
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::memcpy(buff, &error, 8);
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for (i = 8;i <= msg_sz;i++)
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{
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buff[i] = msg[i - 8];
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}
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::sendto(usi->m_sock, buff, msg_sz, 0, reinterpret_cast<SOCKADDR*>(remote), sizeof(*remote));
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LOG_DEBUG("udp-tracker", "Error sent to " << inet_ntoa(remote->sin_addr) << ", '" << msg << "' (len=" << msg_sz << ")");
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return 0;
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}
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int UDPTracker::handleConnection(UDPTracker *usi, SOCKADDR_IN *remote, char *data) {
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ConnectionRequest *req = reinterpret_cast<ConnectionRequest*>(data);
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ConnectionResponse resp;
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resp.action = m_hton32(0);
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resp.transaction_id = req->transaction_id;
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if (!usi->m_conn->genConnectionId(&resp.connection_id,
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m_hton32(remote->sin_addr.s_addr),
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m_hton16(remote->sin_port)))
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{
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return 1;
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}
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::sendto(usi->m_sock, (char*)&resp, sizeof(ConnectionResponse), 0, (SOCKADDR*)remote, sizeof(SOCKADDR_IN));
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return 0;
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}
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int UDPTracker::handleAnnounce(UDPTracker *usi, SOCKADDR_IN *remote, char *data) {
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AnnounceRequest *req;
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AnnounceResponse *resp;
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int q, // peer counts
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bSize, // message size
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i; // loop index
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DatabaseDriver::TorrentEntry tE;
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uint8_t buff[1028]; // Reasonable buffer size. (header+168 peers)
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req = (AnnounceRequest*)data;
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if (!usi->m_conn->verifyConnectionId(req->connection_id,
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m_hton32(remote->sin_addr.s_addr),
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m_hton16(remote->sin_port)))
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{
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return 1;
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}
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// change byte order:
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req->port = m_hton16(req->port);
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req->ip_address = m_hton32(req->ip_address);
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req->downloaded = m_hton64(req->downloaded);
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req->event = m_hton32(req->event); // doesn't really matter for this tracker
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req->uploaded = m_hton64(req->uploaded);
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req->num_want = m_hton32(req->num_want);
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req->left = m_hton64(req->left);
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if (!usi->m_allowRemotes && req->ip_address != 0)
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{
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UDPTracker::sendError(usi, remote, req->transaction_id, "Tracker doesn't allow remote IP's; Request ignored.");
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return 0;
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}
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if (!usi->m_conn->isTorrentAllowed(req->info_hash))
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{
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UDPTracker::sendError(usi, remote, req->transaction_id, "info_hash not registered.");
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return 0;
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}
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// load peers
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q = 30;
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if (req->num_want >= 1)
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q = std::min<int>(q, req->num_want);
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DatabaseDriver::TrackerEvents event;
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{
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std::shared_ptr<DatabaseDriver::PeerEntry> peersSptr = std::shared_ptr<DatabaseDriver::PeerEntry>(new DatabaseDriver::PeerEntry[q]);
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DatabaseDriver::PeerEntry *peers = peersSptr.get();
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switch (req->event)
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{
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case 1:
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event = DatabaseDriver::EVENT_COMPLETE;
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break;
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case 2:
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event = DatabaseDriver::EVENT_START;
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break;
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case 3:
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event = DatabaseDriver::EVENT_STOP;
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break;
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default:
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event = DatabaseDriver::EVENT_UNSPEC;
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break;
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}
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if (event == DatabaseDriver::EVENT_STOP)
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q = 0; // no need for peers when stopping.
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if (q > 0)
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usi->m_conn->getPeers(req->info_hash, &q, peers);
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bSize = 20; // header is 20 bytes
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bSize += (6 * q); // + 6 bytes per peer.
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tE.info_hash = req->info_hash;
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usi->m_conn->getTorrentInfo(&tE);
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resp = (AnnounceResponse*)buff;
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resp->action = m_hton32(1);
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resp->interval = m_hton32(usi->m_announceInterval);
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resp->leechers = m_hton32(tE.leechers);
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resp->seeders = m_hton32(tE.seeders);
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resp->transaction_id = req->transaction_id;
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for (i = 0; i < q; i++)
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{
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int x = i * 6;
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// network byte order!!!
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// IP
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buff[20 + x] = ((peers[i].ip & (0xff << 24)) >> 24);
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buff[21 + x] = ((peers[i].ip & (0xff << 16)) >> 16);
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buff[22 + x] = ((peers[i].ip & (0xff << 8)) >> 8);
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buff[23 + x] = (peers[i].ip & 0xff);
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// port
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buff[24 + x] = ((peers[i].port & (0xff << 8)) >> 8);
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buff[25 + x] = (peers[i].port & 0xff);
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}
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}
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::sendto(usi->m_sock, (char*)buff, bSize, 0, (SOCKADDR*)remote, sizeof(SOCKADDR_IN));
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LOG_DEBUG("udp-tracker", "Announce request from " << inet_ntoa(remote->sin_addr) << " (event=" << event << "), Sent " << q << " peers");
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// update DB.
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uint32_t ip;
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if (req->ip_address == 0) // default
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ip = m_hton32 (remote->sin_addr.s_addr);
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else
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ip = req->ip_address;
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usi->m_conn->updatePeer(req->peer_id, req->info_hash, ip, req->port,
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req->downloaded, req->left, req->uploaded, event);
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return 0;
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}
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int UDPTracker::handleScrape(UDPTracker *usi, SOCKADDR_IN *remote, char *data, int len) {
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ScrapeRequest *sR = reinterpret_cast<ScrapeRequest*>(data);
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int v, // validation helper
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c, // torrent counter
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i, // loop counter
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j; // loop counter
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uint8_t hash [20];
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ScrapeResponse *resp;
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uint8_t buffer [1024]; // up to 74 torrents can be scraped at once (17*74+8) < 1024
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// validate request length:
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v = len - 16;
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if (v < 0 || v % 20 != 0)
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{
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UDPTracker::sendError(usi, remote, sR->transaction_id, "Bad scrape request.");
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return 0;
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}
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if (!usi->m_conn->verifyConnectionId(sR->connection_id,
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m_hton32(remote->sin_addr.s_addr),
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m_hton16(remote->sin_port)))
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{
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LOG_DEBUG("udp-tracker", "Bad connection id from " << inet_ntoa(remote->sin_addr));
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return 1;
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}
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// get torrent count.
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c = v / 20;
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resp = reinterpret_cast<ScrapeResponse*>(buffer);
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resp->action = m_hton32(2);
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resp->transaction_id = sR->transaction_id;
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for (i = 0;i < c;i++)
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{
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int32_t *seeders,
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*completed,
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*leechers;
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for (j = 0; j < 20;j++)
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hash[j] = data[j + (i*20)+16];
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seeders = (int32_t*)&buffer[i*12+8];
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completed = (int32_t*)&buffer[i*12+12];
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leechers = (int32_t*)&buffer[i*12+16];
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DatabaseDriver::TorrentEntry tE;
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tE.info_hash = hash;
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if (!usi->m_conn->getTorrentInfo(&tE))
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{
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sendError(usi, remote, sR->transaction_id, "Scrape Failed: couldn't retrieve torrent data");
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return 0;
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}
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*seeders = m_hton32(tE.seeders);
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*completed = m_hton32(tE.completed);
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*leechers = m_hton32(tE.leechers);
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}
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::sendto(usi->m_sock, reinterpret_cast<const char*>(buffer), sizeof(buffer), 0, reinterpret_cast<SOCKADDR*>(remote), sizeof(SOCKADDR_IN));
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|
|
|
LOG_DEBUG("udp-tracker", "Scrape request from " << inet_ntoa(remote->sin_addr) << ", Sent " << c << " torrents");
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int UDPTracker::isIANAIP(uint32_t ip) {
|
|
|
|
uint8_t x = (ip % 256);
|
|
|
|
if (x == 0 || x == 10 || x == 127 || x >= 224)
|
|
|
|
return 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int UDPTracker::resolveRequest(UDPTracker *usi, SOCKADDR_IN *remote, char *data, int r) {
|
|
|
|
ConnectionRequest* cR = reinterpret_cast<ConnectionRequest*>(data);
|
|
|
|
uint32_t action;
|
|
|
|
|
|
|
|
action = m_hton32(cR->action);
|
|
|
|
|
|
|
|
if (!usi->m_allowIANA_IPs)
|
|
|
|
{
|
|
|
|
if (isIANAIP(remote->sin_addr.s_addr))
|
|
|
|
{
|
|
|
|
LOG_DEBUG("udp-tracker", "Request from IANA reserved IP rejected (" << inet_ntoa(remote->sin_addr) << ")");
|
|
|
|
return 0; // Access Denied: IANA reserved IP.
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (action == 0 && r >= 16)
|
|
|
|
return UDPTracker::handleConnection(usi, remote, data);
|
|
|
|
else if (action == 1 && r >= 98)
|
|
|
|
return UDPTracker::handleAnnounce(usi, remote, data);
|
|
|
|
else if (action == 2)
|
|
|
|
return UDPTracker::handleScrape(usi, remote, data, r);
|
|
|
|
else
|
|
|
|
{
|
|
|
|
UDPTracker::sendError(usi, remote, cR->transaction_id, "Tracker couldn't understand Client's request.");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void UDPTracker::_thread_start(UDPTracker *usi) {
|
|
|
|
SOCKADDR_IN remoteAddr;
|
|
|
|
char tmpBuff[UDP_BUFFER_SIZE];
|
|
|
|
|
|
|
|
#ifdef linux
|
|
|
|
socklen_t addrSz;
|
|
|
|
#else
|
|
|
|
int addrSz;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
addrSz = sizeof(SOCKADDR_IN);
|
|
|
|
|
|
|
|
while (usi->m_shouldRun)
|
|
|
|
{
|
|
|
|
// peek into the first 12 bytes of data; determine if connection request or announce request.
|
|
|
|
int r = ::recvfrom(usi->m_sock, (char*)tmpBuff, UDP_BUFFER_SIZE, 0, (SOCKADDR*)&remoteAddr, &addrSz);
|
|
|
|
if (r <= 0)
|
|
|
|
{
|
|
|
|
std::this_thread::yield();
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
UDPTracker::resolveRequest(usi, &remoteAddr, tmpBuff, r);
|
|
|
|
}
|
|
|
|
|
|
|
|
LOG_INFO("udp-tracker", "worker " << std::this_thread::get_id() << " exited.");
|
|
|
|
}
|
|
|
|
|
|
|
|
void UDPTracker::_maintainance_start(UDPTracker* usi) {
|
|
|
|
std::unique_lock<std::mutex> lk (usi->m_maintenanceMutex);
|
|
|
|
|
|
|
|
while (true)
|
|
|
|
{
|
|
|
|
if (std::cv_status::no_timeout == usi->m_maintenanceCondition.wait_for(lk, std::chrono::seconds(usi->m_cleanupInterval))) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
LOG_INFO("udp-tracker", "Maintenance running...");
|
|
|
|
usi->m_conn->cleanup();
|
|
|
|
}
|
|
|
|
|
|
|
|
lk.unlock();
|
|
|
|
LOG_INFO("udp-tracker", "Maintenance thread " << std::this_thread::get_id() << " existed.");
|
|
|
|
}
|
|
|
|
};
|