/** * Manages handshaking with the client. * * If seeders_stop_seeding is set to a number greater than 0, * we check if we have at least N seeders beyond ourselves for the requested * torrent and if so, stop seeding (to spare bandwidth). * * @param Client $client Client * * @throws Error\CloseConnection In case when the request is invalid * or we don't want or cannot serve * the requested torrent. * @return void */ protected function shakeHand(Client $client) { $protocol_length = unpack('C', $client->socketRead(1)); $protocol_length = current($protocol_length); $protocol = $client->socketRead($protocol_length); if ($protocol !== self::PROTOCOL_STRING) { $this->logger->logError("Client tries to connect with unsupported protocol: " . substr($protocol, 0, 100) . ". Closing connection."); throw new Error\CloseConnection('Unsupported protocol.'); } // 8 reserved void bytes. $client->socketRead(8); $info_hash = $client->socketRead(20); $client->setPeerId($client->socketRead(20)); $info_hash_readable = unpack('H*', $info_hash); $info_hash_readable = reset($info_hash_readable); $torrent = $this->persistence->getTorrent($info_hash); if (!isset($torrent)) { throw new Error\CloseConnection('Unknown info hash.'); } $client->setTorrent($torrent); // If we have X other seeders already, we stop seeding on our own. if (0 < ($seeders_stop_seeding = $this->seeders_stop_seeding)) { $stats = $this->persistence->getPeerStats($info_hash, $this->peer_id); if ($stats['complete'] >= $seeders_stop_seeding) { $this->logger->logMessage("External seeder limit ({$seeders_stop_seeding}) reached " . "for info hash {$info_hash_readable}, stopping seeding."); throw new Error\CloseConnection('Stop seeding, we have others to seed.'); } } // Our handshake signal. $client->socketWrite(pack('C', strlen(self::PROTOCOL_STRING)) . self::PROTOCOL_STRING . pack('a8', '') . $info_hash . pack('a20', $this->peer_id)); $this->logger->logMessage("Handshake completed with peer {$client->getPeerId()} " . "with address {$client->getAddress()}:{$client->getPort()}, " . "info hash: {$info_hash_readable}."); }
/** * Save announce for all the torrents in the database * so clients know where to connect. * * This method runs in infinite loop repeating * announcing every self::ANNOUNCE_INTERVAL seconds. * * @return void */ protected function announce() { $persistence = $this->persistence; $iterations = 0; do { $all_torrents = $persistence->getAllInfoHash(); foreach ($all_torrents as $torrent_info) { $persistence->saveAnnounce($torrent_info['info_hash'], $this->peer->getPeerId(), $this->peer->getExternalAddress(), $this->peer->getPort(), $torrent_info['length'], 0, 0, 'complete', self::ANNOUNCE_INTERVAL); } $this->logger->logMessage('Seeder server announced itself for ' . count($all_torrents) . " torrents at address {$this->peer->getExternalAddress()}:" . "{$this->peer->getPort()} (announces every " . self::ANNOUNCE_INTERVAL . 's).'); sleep(self::ANNOUNCE_INTERVAL); // Memory leak prevention, see self::STOP_AFTER_ITERATIONS. } while (++$iterations < self::STOP_AFTER_ITERATIONS); $this->logger->logMessage('Announce process restarts to prevent memory leaks.'); exit(0); }