/**
* makes a connection to a hidden service
*
* @param sp hostname, port to connect to and other stuff
* @return some socket-thing
*/
private TCPStream connectToHidden(TCPStreamProperties spo) throws IOException {
// check, if tor is still in startup-phase
checkStartup();
Circuit myRendezvousCirc = null;
Server hiddenServer;
Node hiddenNode = null;
// String address, x, y;
String z;
// Iterator it, i, i2;
byte[] cookie = new byte[20];
// boolean notFound;
int j;
z = (String) Encoding.parseHiddenAddress(spo.hostname).get("z");
// Do we already have a connection to this address?
if (hiddenServiceCircuits.containsKey(z)) {
// TODO assess suitability of this circuit
System.out.println("Reusing existing circuit");
TCPStreamProperties tcpProps = new TCPStreamProperties("", spo.port);
try {
return new TCPStream(hiddenServiceCircuits.get(z), tcpProps);
} catch (TorNoAnswerException e) {
// Create a new circuit instead
e.printStackTrace();
} catch (TorException e) {
// Create a new circuit instead
e.printStackTrace();
}
}
// get a copy from the service descriptor (either local cache or
// retrieve form network)
ServiceDescriptor sd = (ServiceDescriptor) cachedServiceDescriptors.get(z);
if (sd == null || (!sd.checkTimeStampValidity())) {
sd = ServiceDescriptor.loadFromDirectory(z, this);
cachedServiceDescriptors.put(z, sd); // cache it
}
boolean establishedRendezvous = false;
j = 0; // attempts counted
// spo.connect_retries try to establish rendezvous
while ((j < spo.connect_retries) && (!establishedRendezvous)) {
j++;
try {
myRendezvousCirc = fnh.provideSuitableNewCircuit(new TCPStreamProperties());
String rendezvousName =
myRendezvousCirc.route[myRendezvousCirc.route_established - 1].server.nickname;
Logger.logGeneral(
Logger.INFO,
"Tor.connectToHidden: establishing rendezvous point for "
+ z
+ " at "
+ rendezvousName);
Random rnd = new Random();
rnd.nextBytes(cookie);
myRendezvousCirc.send_cell(new CellRelayEstablishRendezvous(myRendezvousCirc, cookie));
myRendezvousCirc.streamHistory.add(spo.hostname);
// wait for answer
CellRelay rendezvousACK =
myRendezvousCirc.queue.receiveRelayCell(CellRelay.CELL_RELAY_RENDEZVOUS_ESTABLISHED);
if (rendezvousACK.length > 0) {
throw new TorException("Tor.connectToHidden: Got NACK from RENDEZVOUS Point");
}
myRendezvousCirc.sd = sd;
hiddenServer = new Server(this, sd.publicKey);
hiddenNode = new Node(hiddenServer); // between HS and
// Rendezvous point
establishedRendezvous = true;
} catch (IOException e) {
e.printStackTrace();
} catch (TorException e) {
e.printStackTrace();
}
}
if (!establishedRendezvous) {
Logger.logGeneral(
Logger.WARNING, "Tor.connectToHidden: coudn't establishing rendezvous point for " + z);
throw new IOException("Tor.connectToHidden: coudn't establishing rendezvous point for " + z);
}
Iterator<IntroductionPoint> it3 = sd.introPoints.iterator();
String rendezvousName =
myRendezvousCirc.route[myRendezvousCirc.route.length - 1].server.nickname;
while (it3.hasNext()) {
IntroductionPoint iPoint = (IntroductionPoint) it3.next();
Logger.logGeneral(
Logger.INFO,
"Tor.connectToHidden: contacting introduction point "
+ iPoint.getNickname()
+ " for "
+ z);
// introduce rendezvous to the node
TCPStreamProperties spIntro = new TCPStreamProperties();
spIntro.exitPolicyRequired = false;
// Server sr = iPoint.getSrv();
spIntro.setCustomExitpoint(iPoint.getNickname());
try {
// make new circ where the last node is intro point
Circuit myIntroCirc = new Circuit(this, fnh, dir, spIntro);
// System.out.println(" LAST NODE IS... " +
// myIntroCirc.route[myIntroCirc.route.length-1].server.name);
// and CellIntro1 data encrypted with PK of Hidden Service, and _not_ of the introPoint
myIntroCirc.send_cell(
new CellRelayIntroduce1(myIntroCirc, cookie, sd, rendezvousName, hiddenNode));
// wait for ack
CellRelay introACK =
myIntroCirc.queue.receiveRelayCell(CellRelay.CELL_RELAY_COMMAND_INTRODUCE_ACK);
if (introACK.length > 0)
throw new TorException("Tor.connectToHidden: Got NACK from Introduction Point");
// introduce ACK is received
Logger.logGeneral(Logger.RAW_DATA, "Tor.connectToHidden: Got ACK from Intro Point");
myIntroCirc.close(true);
// wait for answer from the hidden service (RENDEZVOUS2)
int oldTimeout = myRendezvousCirc.queue.timeout;
if (oldTimeout < 120 * 1000) myRendezvousCirc.queue.timeout = 120 * 1000;
CellRelay r2Relay =
myRendezvousCirc.queue.receiveRelayCell(CellRelay.CELL_RELAY_RENDEZVOUS2);
myRendezvousCirc.queue.timeout = oldTimeout;
// finish diffie-hellman
byte[] dh_gy = new byte[148];
System.arraycopy(r2Relay.data, 0, dh_gy, 0, 148);
hiddenNode.finish_dh(dh_gy);
myRendezvousCirc.addNode(hiddenNode);
Logger.logGeneral(
Logger.INFO, "Tor.connectToHidden: succesfully established rendezvous with " + z);
// address in begin cell set to "";
TCPStreamProperties tcpProps = new TCPStreamProperties("", spo.port);
if (hiddenServiceCircuits.containsKey(z)) hiddenServiceCircuits.remove(z);
hiddenServiceCircuits.put(z, myRendezvousCirc);
// connect
return new TCPStream(myRendezvousCirc, tcpProps);
} catch (TorException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
// all intros failed...
// perhaps there is something wrong with out cached service descriptor
cachedServiceDescriptors.remove(z);
throw new IOException("Tor.connectToHidden: couldn't connect to an introduction point of " + z);
}
