/**
* Can't find a published standard for this anywhere. See the libtorrent code. Here we use the
* "added" key as a single string of concatenated 32-byte peer hashes. added.f and dropped
* unsupported
*
* @since 0.8.4
*/
private static void handlePEX(Peer peer, PeerListener listener, byte[] bs, Log log) {
if (log.shouldLog(Log.DEBUG)) log.debug("Got PEX msg from " + peer);
try {
InputStream is = new ByteArrayInputStream(bs);
BDecoder dec = new BDecoder(is);
BEValue bev = dec.bdecodeMap();
Map<String, BEValue> map = bev.getMap();
bev = map.get("added");
if (bev == null) return;
byte[] ids = bev.getBytes();
if (ids.length < HASH_LENGTH) return;
int len = Math.min(ids.length, (I2PSnarkUtil.MAX_CONNECTIONS - 1) * HASH_LENGTH);
List<PeerID> peers = new ArrayList<PeerID>(len / HASH_LENGTH);
for (int off = 0; off < len; off += HASH_LENGTH) {
byte[] hash = new byte[HASH_LENGTH];
System.arraycopy(ids, off, hash, 0, HASH_LENGTH);
if (DataHelper.eq(hash, peer.getPeerID().getDestHash())) continue;
PeerID pID = new PeerID(hash, listener.getUtil());
peers.add(pID);
}
// could include ourselves, listener must remove
listener.gotPeers(peer, peers);
} catch (Exception e) {
if (log.shouldLog(Log.INFO)) log.info("PEX msg exception from " + peer, e);
// peer.disconnect(false);
}
}
/**
* Creates a new MetaInfo from the given BDecoder. The BDecoder must have a complete dictionary
* describing the torrent.
*/
private MetaInfo(BDecoder be) throws IOException {
// Note that evaluation order matters here...
this(be.bdecodeMap().getMap());
byte[] origInfohash = be.get_special_map_digest();
// shouldn't ever happen
if (!DataHelper.eq(origInfohash, info_hash))
throw new InvalidBEncodingException("Infohash mismatch, please report");
}
/**
* Efficiently returns the name and the 20 byte SHA1 hash of the info dictionary in a torrent file
* Caller must close stream.
*
* @param infoHashOut 20-byte out parameter
* @since 0.8.5
*/
public static String getNameAndInfoHash(InputStream in, byte[] infoHashOut) throws IOException {
BDecoder bd = new BDecoder(in);
Map<String, BEValue> m = bd.bdecodeMap().getMap();
BEValue ibev = m.get("info");
if (ibev == null) throw new InvalidBEncodingException("Missing info map");
Map<String, BEValue> i = ibev.getMap();
BEValue rvbev = i.get("name");
if (rvbev == null) throw new InvalidBEncodingException("Missing name");
byte[] h = bd.get_special_map_digest();
System.arraycopy(h, 0, infoHashOut, 0, 20);
return rvbev.getString();
}
/**
* Receive the DHT port numbers
*
* @since DHT
*/
private static void handleDHT(Peer peer, PeerListener listener, byte[] bs, Log log) {
if (log.shouldLog(Log.DEBUG)) log.debug("Got DHT msg from " + peer);
try {
InputStream is = new ByteArrayInputStream(bs);
BDecoder dec = new BDecoder(is);
BEValue bev = dec.bdecodeMap();
Map<String, BEValue> map = bev.getMap();
int qport = map.get("port").getInt();
int rport = map.get("rport").getInt();
listener.gotPort(peer, qport, rport);
} catch (Exception e) {
if (log.shouldLog(Log.INFO)) log.info("DHT msg exception from " + peer, e);
// peer.disconnect(false);
}
}
private static void handleHandshake(Peer peer, PeerListener listener, byte[] bs, Log log) {
if (log.shouldLog(Log.DEBUG)) log.debug("Got handshake msg from " + peer);
try {
// this throws NPE on missing keys
InputStream is = new ByteArrayInputStream(bs);
BDecoder dec = new BDecoder(is);
BEValue bev = dec.bdecodeMap();
Map<String, BEValue> map = bev.getMap();
peer.setHandshakeMap(map);
Map<String, BEValue> msgmap = map.get("m").getMap();
if (log.shouldLog(Log.DEBUG))
log.debug("Peer " + peer + " supports extensions: " + msgmap.keySet());
// if (msgmap.get(TYPE_PEX) != null) {
// if (log.shouldLog(Log.DEBUG))
// log.debug("Peer supports PEX extension: " + peer);
// // peer state calls peer listener calls sendPEX()
// }
// if (msgmap.get(TYPE_DHT) != null) {
// if (log.shouldLog(Log.DEBUG))
// log.debug("Peer supports DHT extension: " + peer);
// // peer state calls peer listener calls sendDHT()
// }
MagnetState state = peer.getMagnetState();
if (msgmap.get(TYPE_METADATA) == null) {
if (log.shouldLog(Log.DEBUG))
log.debug("Peer does not support metadata extension: " + peer);
// drop if we need metainfo and we haven't found anybody yet
synchronized (state) {
if (!state.isInitialized()) {
if (log.shouldLog(Log.DEBUG)) log.debug("Dropping peer, we need metadata! " + peer);
peer.disconnect();
}
}
return;
}
BEValue msize = map.get("metadata_size");
if (msize == null) {
if (log.shouldLog(Log.DEBUG))
log.debug("Peer does not have the metainfo size yet: " + peer);
// drop if we need metainfo and we haven't found anybody yet
synchronized (state) {
if (!state.isInitialized()) {
if (log.shouldLog(Log.DEBUG)) log.debug("Dropping peer, we need metadata! " + peer);
peer.disconnect();
}
}
return;
}
int metaSize = msize.getInt();
if (log.shouldLog(Log.DEBUG)) log.debug("Got the metainfo size: " + metaSize);
int remaining;
synchronized (state) {
if (state.isComplete()) return;
if (state.isInitialized()) {
if (state.getSize() != metaSize) {
if (log.shouldLog(Log.DEBUG))
log.debug("Wrong metainfo size " + metaSize + " from: " + peer);
peer.disconnect();
return;
}
} else {
// initialize it
if (metaSize > MAX_METADATA_SIZE) {
if (log.shouldLog(Log.DEBUG))
log.debug("Huge metainfo size " + metaSize + " from: " + peer);
peer.disconnect(false);
return;
}
if (log.shouldLog(Log.INFO))
log.info("Initialized state, metadata size = " + metaSize + " from " + peer);
state.initialize(metaSize);
}
remaining = state.chunksRemaining();
}
// send requests for chunks
int count = Math.min(remaining, PARALLEL_REQUESTS);
for (int i = 0; i < count; i++) {
int chk;
synchronized (state) {
chk = state.getNextRequest();
}
if (log.shouldLog(Log.INFO)) log.info("Request chunk " + chk + " from " + peer);
sendRequest(peer, chk);
}
} catch (Exception e) {
if (log.shouldLog(Log.WARN)) log.warn("Handshake exception from " + peer, e);
}
}
/**
* REF: BEP 9
*
* @since 0.8.4
*/
private static void handleMetadata(Peer peer, PeerListener listener, byte[] bs, Log log) {
if (log.shouldLog(Log.DEBUG)) log.debug("Got metadata msg from " + peer);
try {
InputStream is = new ByteArrayInputStream(bs);
BDecoder dec = new BDecoder(is);
BEValue bev = dec.bdecodeMap();
Map<String, BEValue> map = bev.getMap();
int type = map.get("msg_type").getInt();
int piece = map.get("piece").getInt();
MagnetState state = peer.getMagnetState();
if (type == TYPE_REQUEST) {
if (log.shouldLog(Log.DEBUG)) log.debug("Got request for " + piece + " from: " + peer);
byte[] pc;
synchronized (state) {
pc = state.getChunk(piece);
}
sendPiece(peer, piece, pc);
// Do this here because PeerConnectionOut only reports for PIECE messages
peer.uploaded(pc.length);
listener.uploaded(peer, pc.length);
} else if (type == TYPE_DATA) {
int size = map.get("total_size").getInt();
if (log.shouldLog(Log.DEBUG))
log.debug("Got data for " + piece + " length " + size + " from: " + peer);
boolean done;
int chk = -1;
synchronized (state) {
if (state.isComplete()) return;
int len = is.available();
if (len != size) {
// probably fatal
if (log.shouldLog(Log.WARN)) log.warn("total_size " + size + " but avail data " + len);
}
peer.downloaded(len);
listener.downloaded(peer, len);
done = state.saveChunk(piece, bs, bs.length - len, len);
if (log.shouldLog(Log.INFO)) log.info("Got chunk " + piece + " from " + peer);
if (!done) chk = state.getNextRequest();
}
// out of the lock
if (done) {
// Done!
// PeerState will call the listener (peer coord), who will
// check to see if the MagnetState has it
if (log.shouldLog(Log.WARN)) log.warn("Got last chunk from " + peer);
} else {
// get the next chunk
if (log.shouldLog(Log.INFO)) log.info("Request chunk " + chk + " from " + peer);
sendRequest(peer, chk);
}
} else if (type == TYPE_REJECT) {
if (log.shouldLog(Log.WARN)) log.warn("Got reject msg from " + peer);
peer.disconnect(false);
} else {
if (log.shouldLog(Log.WARN)) log.warn("Got unknown metadata msg from " + peer);
peer.disconnect(false);
}
} catch (Exception e) {
if (log.shouldLog(Log.INFO)) log.info("Metadata ext. msg. exception from " + peer, e);
// fatal ?
peer.disconnect(false);
}
}