protected PRUDPPacket handleConnect(String client_ip_address, PRUDPPacketRequest request) {
long conn_id = allocateConnectionId(client_ip_address);
PRUDPPacket reply = new PRUDPPacketReplyConnect(request.getTransactionId(), conn_id);
return (reply);
}
public void runSupport() {
byte[] input_buffer = new byte[request_dg.getLength()];
System.arraycopy(request_dg.getData(), 0, input_buffer, 0, input_buffer.length);
int packet_data_length = input_buffer.length;
String auth_user = null;
byte[] auth_user_bytes = null;
byte[] auth_hash = null;
if (server.isTrackerPasswordEnabled()) {
// auth detail should be attached to the packet. Auth details are 16
// bytes
if (input_buffer.length < 17) {
Logger.log(
new LogEvent(
LOGID,
LogEvent.LT_WARNING,
"TRTrackerServerProcessorUDP: " + "packet received but authorisation missing"));
return;
}
packet_data_length -= 16;
auth_user_bytes = new byte[8];
auth_hash = new byte[8];
System.arraycopy(input_buffer, packet_data_length, auth_user_bytes, 0, 8);
int user_len = 0;
while (user_len < 8 && auth_user_bytes[user_len] != 0) {
user_len++;
}
auth_user = new String(auth_user_bytes, 0, user_len);
System.arraycopy(input_buffer, packet_data_length + 8, auth_hash, 0, 8);
}
DataInputStream is =
new DataInputStream(new ByteArrayInputStream(input_buffer, 0, packet_data_length));
try {
String client_ip_address = request_dg.getAddress().getHostAddress();
PRUDPPacketRequest request = PRUDPPacketRequest.deserialiseRequest(null, is);
Logger.log(
new LogEvent(
LOGID, "TRTrackerServerProcessorUDP: packet received: " + request.getString()));
PRUDPPacket reply = null;
TRTrackerServerTorrentImpl torrent = null;
if (auth_user_bytes != null) {
// user name is irrelevant as we only have one at the moment
// <parg_home> so <new_packet> = <old_packet> + <user_padded_to_8_bytes> + <hash>
// <parg_home> where <hash> = first 8 bytes of sha1(<old_packet> + <user_padded_to_8> +
// sha1(pass))
// <XTF> Yes
byte[] sha1_pw = null;
if (server.hasExternalAuthorisation()) {
try {
URL resource = new URL("udp://" + server.getHost() + ":" + server.getPort() + "/");
sha1_pw = server.performExternalAuthorisation(resource, auth_user);
} catch (MalformedURLException e) {
Debug.printStackTrace(e);
}
if (sha1_pw == null) {
Logger.log(
new LogEvent(
LOGID,
LogEvent.LT_ERROR,
"TRTrackerServerProcessorUDP: auth fails for user '" + auth_user + "'"));
reply = new PRUDPPacketReplyError(request.getTransactionId(), "Access Denied");
}
} else {
sha1_pw = server.getPassword();
}
// if we haven't already failed then check the PW
if (reply == null) {
SHA1Hasher hasher = new SHA1Hasher();
hasher.update(input_buffer, 0, packet_data_length);
hasher.update(auth_user_bytes);
hasher.update(sha1_pw);
byte[] digest = hasher.getDigest();
for (int i = 0; i < auth_hash.length; i++) {
if (auth_hash[i] != digest[i]) {
Logger.log(
new LogEvent(
LOGID,
LogEvent.LT_ERROR,
"TRTrackerServerProcessorUDP: auth fails for user '" + auth_user + "'"));
reply = new PRUDPPacketReplyError(request.getTransactionId(), "Access Denied");
break;
}
}
}
}
int request_type = TRTrackerServerRequest.RT_UNKNOWN;
if (reply == null) {
if (server.isEnabled()) {
try {
int type = request.getAction();
if (type == PRUDPPacketTracker.ACT_REQUEST_CONNECT) {
reply = handleConnect(client_ip_address, request);
} else if (type == PRUDPPacketTracker.ACT_REQUEST_ANNOUNCE) {
Object[] x =
handleAnnounceAndScrape(
client_ip_address, request, TRTrackerServerRequest.RT_ANNOUNCE);
if (x == null) {
throw (new Exception("Connection ID mismatch"));
}
reply = (PRUDPPacket) x[0];
torrent = (TRTrackerServerTorrentImpl) x[1];
request_type = TRTrackerServerRequest.RT_ANNOUNCE;
} else if (type == PRUDPPacketTracker.ACT_REQUEST_SCRAPE) {
Object[] x =
handleAnnounceAndScrape(
client_ip_address, request, TRTrackerServerRequest.RT_SCRAPE);
if (x == null) {
throw (new Exception("Connection ID mismatch"));
}
reply = (PRUDPPacket) x[0];
torrent = (TRTrackerServerTorrentImpl) x[1];
request_type = TRTrackerServerRequest.RT_SCRAPE;
} else {
reply = new PRUDPPacketReplyError(request.getTransactionId(), "unsupported action");
}
} catch (Throwable e) {
// e.printStackTrace();
String error = e.getMessage();
if (error == null) {
error = e.toString();
}
reply = new PRUDPPacketReplyError(request.getTransactionId(), error);
}
} else {
System.out.println("UDP Tracker: replying 'disabled' to " + client_ip_address);
reply = new PRUDPPacketReplyError(request.getTransactionId(), "UDP Tracker disabled");
}
}
if (reply != null) {
InetAddress address = request_dg.getAddress();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream os = new DataOutputStream(baos);
reply.serialise(os);
byte[] output_buffer = baos.toByteArray();
DatagramPacket reply_packet =
new DatagramPacket(output_buffer, output_buffer.length, address, request_dg.getPort());
socket.send(reply_packet);
server.updateStats(request_type, torrent, input_buffer.length, output_buffer.length);
}
} catch (Throwable e) {
Logger.log(new LogEvent(LOGID, "TRTrackerServerProcessorUDP: processing fails", e));
} finally {
try {
is.close();
} catch (Throwable e) {
}
}
}
protected Object[] handleAnnounceAndScrape(
String client_ip_address, PRUDPPacketRequest request, int request_type) throws Exception {
if (!checkConnectionId(client_ip_address, request.getConnectionId())) {
return (null);
}
List hashbytes = new ArrayList();
HashWrapper peer_id = null;
int port = 0;
String event = null;
long uploaded = 0;
long downloaded = 0;
long left = 0;
int num_want = -1;
String key = null;
if (request_type == TRTrackerServerRequest.RT_ANNOUNCE) {
if (PRUDPPacketTracker.VERSION == 1) {
PRUDPPacketRequestAnnounce announce = (PRUDPPacketRequestAnnounce) request;
hashbytes.add(announce.getHash());
peer_id = new HashWrapper(announce.getPeerId());
port = announce.getPort();
int i_event = announce.getEvent();
switch (i_event) {
case PRUDPPacketRequestAnnounce.EV_STARTED:
{
event = "started";
break;
}
case PRUDPPacketRequestAnnounce.EV_STOPPED:
{
event = "stopped";
break;
}
case PRUDPPacketRequestAnnounce.EV_COMPLETED:
{
event = "completed";
break;
}
}
uploaded = announce.getUploaded();
downloaded = announce.getDownloaded();
left = announce.getLeft();
num_want = announce.getNumWant();
int i_ip = announce.getIPAddress();
if (i_ip != 0) {
client_ip_address = PRHelpers.intToAddress(i_ip);
}
} else {
PRUDPPacketRequestAnnounce2 announce = (PRUDPPacketRequestAnnounce2) request;
hashbytes.add(announce.getHash());
peer_id = new HashWrapper(announce.getPeerId());
port = announce.getPort();
int i_event = announce.getEvent();
switch (i_event) {
case PRUDPPacketRequestAnnounce.EV_STARTED:
{
event = "started";
break;
}
case PRUDPPacketRequestAnnounce.EV_STOPPED:
{
event = "stopped";
break;
}
case PRUDPPacketRequestAnnounce.EV_COMPLETED:
{
event = "completed";
break;
}
}
uploaded = announce.getUploaded();
downloaded = announce.getDownloaded();
left = announce.getLeft();
num_want = announce.getNumWant();
int i_ip = announce.getIPAddress();
if (i_ip != 0) {
client_ip_address = PRHelpers.intToAddress(i_ip);
}
key = "" + announce.getKey();
}
} else {
PRUDPPacketRequestScrape scrape = (PRUDPPacketRequestScrape) request;
hashbytes.addAll(scrape.getHashes());
}
Map[] root_out = new Map[1];
TRTrackerServerPeerImpl[] peer_out = new TRTrackerServerPeerImpl[1];
TRTrackerServerTorrentImpl torrent =
processTrackerRequest(
server,
"",
root_out,
peer_out,
request_type,
(byte[][]) hashbytes.toArray(new byte[0][0]),
null,
null,
peer_id,
false,
TRTrackerServerTorrentImpl.COMPACT_MODE_NONE,
key, // currently no "no_peer_id" / "compact" in the packet and anyway they aren't
// returned / key
event,
false,
port,
0,
0,
client_ip_address,
client_ip_address,
downloaded,
uploaded,
left,
num_want,
TRTrackerServerPeer.CRYPTO_NONE,
(byte) 1,
0,
null);
Map root = root_out[0];
if (request_type == TRTrackerServerRequest.RT_ANNOUNCE) {
if (PRUDPPacketTracker.VERSION == 1) {
PRUDPPacketReplyAnnounce reply = new PRUDPPacketReplyAnnounce(request.getTransactionId());
reply.setInterval(((Long) root.get("interval")).intValue());
List peers = (List) root.get("peers");
int[] addresses = new int[peers.size()];
short[] ports = new short[addresses.length];
for (int i = 0; i < addresses.length; i++) {
Map peer = (Map) peers.get(i);
addresses[i] = PRHelpers.addressToInt(new String((byte[]) peer.get("ip")));
ports[i] = (short) ((Long) peer.get("port")).shortValue();
}
reply.setPeers(addresses, ports);
return (new Object[] {reply, torrent});
} else {
PRUDPPacketReplyAnnounce2 reply = new PRUDPPacketReplyAnnounce2(request.getTransactionId());
reply.setInterval(((Long) root.get("interval")).intValue());
boolean local_scrape = client_ip_address.equals("127.0.0.1");
Map scrape_details = torrent.exportScrapeToMap("", client_ip_address, !local_scrape);
int seeders = ((Long) scrape_details.get("complete")).intValue();
int leechers = ((Long) scrape_details.get("incomplete")).intValue();
reply.setLeechersSeeders(leechers, seeders);
List peers = (List) root.get("peers");
int[] addresses = new int[peers.size()];
short[] ports = new short[addresses.length];
for (int i = 0; i < addresses.length; i++) {
Map peer = (Map) peers.get(i);
addresses[i] = PRHelpers.addressToInt(new String((byte[]) peer.get("ip")));
ports[i] = (short) ((Long) peer.get("port")).shortValue();
}
reply.setPeers(addresses, ports);
return (new Object[] {reply, torrent});
}
} else {
if (PRUDPPacketTracker.VERSION == 1) {
PRUDPPacketReplyScrape reply = new PRUDPPacketReplyScrape(request.getTransactionId());
/*
Long interval = (Long)root.get("interval");
if ( interval != null ){
reply.setInterval(interval.intValue());
}
*/
Map files = (Map) root.get("files");
byte[][] hashes = new byte[files.size()][];
int[] s_complete = new int[hashes.length];
int[] s_downloaded = new int[hashes.length];
int[] s_incomplete = new int[hashes.length];
Iterator it = files.keySet().iterator();
int pos = 0;
while (it.hasNext()) {
String hash_str = (String) it.next();
hashes[pos] = hash_str.getBytes(Constants.BYTE_ENCODING);
Map details = (Map) files.get(hash_str);
s_complete[pos] = ((Long) details.get("complete")).intValue();
s_incomplete[pos] = ((Long) details.get("incomplete")).intValue();
s_downloaded[pos] = ((Long) details.get("downloaded")).intValue();
pos++;
}
reply.setDetails(hashes, s_complete, s_downloaded, s_incomplete);
return (new Object[] {reply, torrent});
} else {
PRUDPPacketReplyScrape2 reply = new PRUDPPacketReplyScrape2(request.getTransactionId());
/*
Long interval = (Long)root.get("interval");
if ( interval != null ){
reply.setInterval(interval.intValue());
}
*/
Map files = (Map) root.get("files");
int[] s_complete = new int[files.size()];
int[] s_downloaded = new int[s_complete.length];
int[] s_incomplete = new int[s_complete.length];
Iterator it = files.keySet().iterator();
int pos = 0;
while (it.hasNext()) {
String hash_str = (String) it.next();
Map details = (Map) files.get(hash_str);
s_complete[pos] = ((Long) details.get("complete")).intValue();
s_incomplete[pos] = ((Long) details.get("incomplete")).intValue();
s_downloaded[pos] = ((Long) details.get("downloaded")).intValue();
pos++;
}
reply.setDetails(s_complete, s_downloaded, s_incomplete);
return (new Object[] {reply, torrent});
}
}
}