void QTracker::respondToAnnounceRequest()
{
const QStringMap &gets = m_request.gets;
TrackerAnnounceRequest annonce_req;
// IP
annonce_req.peer.ip = m_env.clientAddress.toString();
// 1. Get info_hash
if (!gets.contains("info_hash")) {
qDebug("QTracker: Missing info_hash");
status(101, "Missing info_hash");
return;
}
annonce_req.info_hash = gets.value("info_hash");
// info_hash cannot be longer than 20 bytes
/*if (annonce_req.info_hash.toLatin1().length() > 20) {
qDebug("QTracker: Info_hash is not 20 byte long: %s (%d)", qPrintable(annonce_req.info_hash), annonce_req.info_hash.toLatin1().length());
status(150, "Invalid infohash");
return;
}*/
// 2. Get peer ID
if (!gets.contains("peer_id")) {
qDebug("QTracker: Missing peer_id");
status(102, "Missing peer_id");
return;
}
annonce_req.peer.peer_id = gets.value("peer_id");
// peer_id cannot be longer than 20 bytes
/*if (annonce_req.peer.peer_id.length() > 20) {
qDebug("QTracker: peer_id is not 20 byte long: %s", qPrintable(annonce_req.peer.peer_id));
status(151, "Invalid peerid");
return;
}*/
// 3. Get port
if (!gets.contains("port")) {
qDebug("QTracker: Missing port");
status(103, "Missing port");
return;
}
bool ok = false;
annonce_req.peer.port = gets.value("port").toInt(&ok);
if (!ok || annonce_req.peer.port < 1 || annonce_req.peer.port > 65535) {
qDebug("QTracker: Invalid port number (%d)", annonce_req.peer.port);
status(103, "Missing port");
return;
}
// 4. Get event
annonce_req.event = "";
if (gets.contains("event")) {
annonce_req.event = gets.value("event");
qDebug("QTracker: event is %s", qPrintable(annonce_req.event));
}
// 5. Get numwant
annonce_req.numwant = 50;
if (gets.contains("numwant")) {
int tmp = gets.value("numwant").toInt();
if (tmp > 0) {
qDebug("QTracker: numwant = %d", tmp);
annonce_req.numwant = tmp;
}
}
// 6. no_peer_id (extension)
annonce_req.no_peer_id = false;
if (gets.contains("no_peer_id"))
annonce_req.no_peer_id = true;
// 7. TODO: support "compact" extension
// Done parsing, now let's reply
if (m_torrents.contains(annonce_req.info_hash)) {
if (annonce_req.event == "stopped") {
qDebug("QTracker: Peer stopped downloading, deleting it from the list");
m_torrents[annonce_req.info_hash].remove(annonce_req.peer.qhash());
return;
}
}
else {
// Unknown torrent
if (m_torrents.size() == MAX_TORRENTS) {
// Reached max size, remove a random torrent
m_torrents.erase(m_torrents.begin());
}
}
// Register the user
PeerList peers = m_torrents.value(annonce_req.info_hash);
if (peers.size() == MAX_PEERS_PER_TORRENT) {
// Too many peers, remove a random one
peers.erase(peers.begin());
}
peers[annonce_req.peer.qhash()] = annonce_req.peer;
m_torrents[annonce_req.info_hash] = peers;
// Reply
replyWithPeerList(annonce_req);
}
