/**
* internal function to use the tor-resolve-functionality
*
* @param query a hostname to be resolved, or for a reverse lookup: A.B.C.D.in-addr.arpa
* @return either an InetAddress (normal query), or a String (reverse-DNS-lookup)
*/
private Object resolve_internal(String query) throws IOException {
try {
// check, if tor is still in startup-phase
checkStartup();
// try to resolv query over all existing circuits
// so iterate over all TLS-Connections
Iterator<String> i = fnh.tls.keySet().iterator();
while (i.hasNext()) {
TLSConnection tls = fnh.tls.get(i.next());
// and over all circuits in each TLS-Connection
Iterator<Integer> i2 = tls.circuits.keySet().iterator();
while (i2.hasNext()) {
Circuit circuit = (Circuit) tls.circuits.get(i2.next());
try {
if (circuit.established) {
// if an answer is given, we're satisfied
ResolveStream rs = new ResolveStream(circuit);
Object o = rs.resolve(query);
rs.close();
return o;
}
;
} catch (Exception e) {
// in case of error, do nothing, but retry with the next
// circuit
}
}
}
// if no circuit could give an answer (possibly there was no
// established circuit?)
// build a new circuit and ask this one to resolve the query
ResolveStream rs = new ResolveStream(new Circuit(this, fnh, dir, new TCPStreamProperties()));
Object o = rs.resolve(query);
rs.close();
return o;
} catch (TorException e) {
throw new IOException("Error in Tor: " + e.getMessage());
} catch (InterruptedException e) {
throw new IOException("Error in Tor: " + e.getMessage());
}
}
/**
* 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);
}
/**
* makes a connection to a remote service
*
* @param sp hostname, port to connect to and other stuff
* @return some socket-thing
*/
public TCPStream connect(TCPStreamProperties sp) throws IOException, TorResolveFailedException {
// Tor.log.logGeneral(Logger.VERBOSE, "Tor: Trying to connect to " + sp.hostname);
if (sp.hostname == null) throw new IOException("Tor: no hostname is provided");
// check, if tor is still in startup-phase
checkStartup();
// check whether the address is hidden
if (sp.hostname.endsWith(".onion")) return connectToHidden(sp);
boolean resolveException = false;
Circuit[] cs = fnh.provideSuitableCircuits(sp, false);
if (TorConfig.veryAggressiveStreamBuilding) {
for (int j = 0; j < cs.length; ++j) {
// start N asynchronous stream building threads
try {
StreamThread[] streamThreads = new StreamThread[cs.length];
for (int i = 0; i < cs.length; ++i) streamThreads[i] = new StreamThread(cs[i], sp);
// wait for the first stream to return
int chosenStream = -1;
int waitingCounter = TorConfig.queueTimeoutStreamBuildup * 1000 / 10;
while ((chosenStream < 0) && (waitingCounter >= 0)) {
boolean atLeastOneAlive = false;
for (int i = 0; (i < cs.length) && (chosenStream < 0); ++i)
if (!streamThreads[i].isAlive()) {
if ((streamThreads[i].stream != null) && (streamThreads[i].stream.established)) {
chosenStream = i;
}
} else {
atLeastOneAlive = true;
}
if (!atLeastOneAlive) break;
Common.sleep(10);
--waitingCounter;
}
// return one and close others
if (chosenStream >= 0) {
TCPStream returnValue = streamThreads[chosenStream].stream;
new ClosingThread(streamThreads, chosenStream);
return returnValue;
}
} catch (Exception e) {
Logger.logStream(Logger.WARNING, "Tor.connect(): " + e.getMessage());
return null;
}
}
} else {
// build serial N streams, stop if successful
for (int i = 0; i < cs.length; ++i) {
try {
return new TCPStream(cs[i], sp);
} catch (TorResolveFailedException e) {
Logger.logStream(Logger.WARNING, "Tor.connect: Resolve failed:" + e.getMessage());
resolveException = true;
} catch (TorNoAnswerException e) {
Logger.logStream(Logger.WARNING, "Tor.connect: Timeout on circuit:" + e.getMessage());
} catch (TorException e) {
Logger.logStream(
Logger.WARNING,
"Tor.connect: TorException trying to reuse existing circuit:" + e.getMessage());
} catch (IOException e) {
Logger.logStream(Logger.WARNING, "Tor.connect: IOException " + e.getMessage());
}
}
}
if (resolveException) throw new TorResolveFailedException();
throw new IOException(
"Tor.connect: unable to connect to "
+ sp.hostname
+ ":"
+ sp.port
+ " after "
+ sp.connect_retries
+ " retries");
}
