/**
* If the target is not connected to the local SOCKS5 proxy an exception should be thrown.
*
* @throws Exception should not happen
*/
@Test
public void shouldFailIfTargetIsNotConnectedToLocalSocks5Proxy() throws Exception {
// start a local SOCKS5 proxy
Socks5Proxy.setLocalSocks5ProxyPort(proxyPort);
Socks5Proxy socks5Proxy = Socks5Proxy.getSocks5Proxy();
socks5Proxy.start();
// build stream host information for local SOCKS5 proxy
StreamHost streamHost =
new StreamHost(connection.getUser(), socks5Proxy.getLocalAddresses().get(0));
streamHost.setPort(socks5Proxy.getPort());
// create digest to get the socket opened by target
String digest = Socks5Utils.createDigest(sessionID, initiatorJID, targetJID);
Socks5ClientForInitiator socks5Client =
new Socks5ClientForInitiator(streamHost, digest, connection, sessionID, targetJID);
try {
socks5Client.getSocket(10000);
fail("exception should be thrown");
} catch (SmackException e) {
assertTrue(e.getMessage().contains("target is not connected to SOCKS5 proxy"));
protocol.verifyAll(); // assert no XMPP messages were sent
}
socks5Proxy.stop();
}
/**
* Target and initiator should successfully connect to a "remote" SOCKS5 proxy and the initiator
* activates the bytestream.
*
* @throws Exception should not happen
*/
@Test
public void shouldSuccessfullyEstablishConnectionAndActivateSocks5Proxy() throws Exception {
// build activation confirmation response
IQ activationResponse =
new IQ() {
@Override
public String getChildElementXML() {
return null;
}
};
activationResponse.setFrom(proxyJID);
activationResponse.setTo(initiatorJID);
activationResponse.setType(IQ.Type.RESULT);
protocol.addResponse(
activationResponse,
Verification.correspondingSenderReceiver,
Verification.requestTypeSET,
new Verification<Bytestream, IQ>() {
public void verify(Bytestream request, IQ response) {
// verify that the correct stream should be activated
assertNotNull(request.getToActivate());
assertEquals(targetJID, request.getToActivate().getTarget());
}
});
// start a local SOCKS5 proxy
Socks5TestProxy socks5Proxy = Socks5TestProxy.getProxy(proxyPort);
socks5Proxy.start();
StreamHost streamHost = new StreamHost(proxyJID, socks5Proxy.getAddress());
streamHost.setPort(socks5Proxy.getPort());
// create digest to get the socket opened by target
String digest = Socks5Utils.createDigest(sessionID, initiatorJID, targetJID);
Socks5ClientForInitiator socks5Client =
new Socks5ClientForInitiator(streamHost, digest, connection, sessionID, targetJID);
Socket initiatorSocket = socks5Client.getSocket(10000);
InputStream in = initiatorSocket.getInputStream();
Socket targetSocket = socks5Proxy.getSocket(digest);
OutputStream out = targetSocket.getOutputStream();
// verify test data
for (int i = 0; i < 10; i++) {
out.write(i);
assertEquals(i, in.read());
}
protocol.verifyAll();
initiatorSocket.close();
targetSocket.close();
socks5Proxy.stop();
}
/**
* Initiator and target should successfully connect to the local SOCKS5 proxy.
*
* @throws Exception should not happen
*/
@Test
public void shouldSuccessfullyConnectThroughLocalSocks5Proxy() throws Exception {
// start a local SOCKS5 proxy
Socks5Proxy.setLocalSocks5ProxyPort(proxyPort);
Socks5Proxy socks5Proxy = Socks5Proxy.getSocks5Proxy();
socks5Proxy.start();
// test data
final byte[] data = new byte[] {1, 2, 3};
// create digest
final String digest = Socks5Utils.createDigest(sessionID, initiatorJID, targetJID);
// allow connection of target with this digest
socks5Proxy.addTransfer(digest);
// build stream host information
final StreamHost streamHost =
new StreamHost(connection.getUser(), socks5Proxy.getLocalAddresses().get(0));
streamHost.setPort(socks5Proxy.getPort());
// target connects to local SOCKS5 proxy
Thread targetThread =
new Thread() {
@Override
public void run() {
try {
Socks5Client targetClient = new Socks5Client(streamHost, digest);
Socket socket = targetClient.getSocket(10000);
socket.getOutputStream().write(data);
} catch (Exception e) {
fail(e.getMessage());
}
}
};
targetThread.start();
Thread.sleep(200);
// initiator connects
Socks5ClientForInitiator socks5Client =
new Socks5ClientForInitiator(streamHost, digest, connection, sessionID, targetJID);
Socket socket = socks5Client.getSocket(10000);
// verify test data
InputStream in = socket.getInputStream();
for (int i = 0; i < data.length; i++) {
assertEquals(data[i], in.read());
}
targetThread.join();
protocol.verifyAll(); // assert no XMPP messages were sent
socks5Proxy.removeTransfer(digest);
socks5Proxy.stop();
}
/**
* Returns the response to the SOCKS5 Bytestream request containing the SOCKS5 proxy used.
*
* @param selectedHost the used SOCKS5 proxy
* @return the response to the SOCKS5 Bytestream request
*/
private Bytestream createUsedHostResponse(StreamHost selectedHost) {
Bytestream response = new Bytestream(this.bytestreamRequest.getSessionID());
response.setTo(this.bytestreamRequest.getFrom());
response.setType(IQ.Type.RESULT);
response.setPacketID(this.bytestreamRequest.getPacketID());
response.setUsedHost(selectedHost.getJID());
return response;
}
/**
* If the initiator can connect to a SOCKS5 proxy but activating the stream fails an exception
* should be thrown.
*
* @throws Exception should not happen
*/
@Test
public void shouldFailIfActivateSocks5ProxyFails() throws Exception {
// build error response as reply to the stream activation
XMPPError xmppError = new XMPPError(XMPPError.Condition.internal_server_error);
IQ error =
new IQ() {
public String getChildElementXML() {
return null;
}
};
error.setType(Type.ERROR);
error.setFrom(proxyJID);
error.setTo(initiatorJID);
error.setError(xmppError);
protocol.addResponse(
error, Verification.correspondingSenderReceiver, Verification.requestTypeSET);
// start a local SOCKS5 proxy
Socks5TestProxy socks5Proxy = Socks5TestProxy.getProxy(proxyPort);
socks5Proxy.start();
StreamHost streamHost = new StreamHost(proxyJID, socks5Proxy.getAddress());
streamHost.setPort(socks5Proxy.getPort());
// create digest to get the socket opened by target
String digest = Socks5Utils.createDigest(sessionID, initiatorJID, targetJID);
Socks5ClientForInitiator socks5Client =
new Socks5ClientForInitiator(streamHost, digest, connection, sessionID, targetJID);
try {
socks5Client.getSocket(10000);
fail("exception should be thrown");
} catch (XMPPErrorException e) {
assertTrue(XMPPError.Condition.internal_server_error.equals(e.getXMPPError().getCondition()));
protocol.verifyAll();
}
socks5Proxy.stop();
}
/**
* Accepts the SOCKS5 Bytestream initialization request and returns the socket to send/receive
* data.
*
* <p>Before accepting the SOCKS5 Bytestream request you can set timeouts by invoking {@link
* #setTotalConnectTimeout(int)} and {@link #setMinimumConnectTimeout(int)}.
*
* @return the socket to send/receive data
* @throws XMPPException if connection to all SOCKS5 proxies failed or if stream is invalid.
* @throws InterruptedException if the current thread was interrupted while waiting
*/
public Socks5BytestreamSession accept() throws XMPPException, InterruptedException {
Collection<StreamHost> streamHosts = this.bytestreamRequest.getStreamHosts();
// throw exceptions if request contains no stream hosts
if (streamHosts.size() == 0) {
cancelRequest();
}
StreamHost selectedHost = null;
Socket socket = null;
String digest =
Socks5Utils.createDigest(
this.bytestreamRequest.getSessionID(),
this.bytestreamRequest.getFrom(),
this.manager.getConnection().getUser());
/*
* determine timeout for each connection attempt; each SOCKS5 proxy has the same amount of
* time so that the first does not consume the whole timeout
*/
int timeout =
Math.max(getTotalConnectTimeout() / streamHosts.size(), getMinimumConnectTimeout());
for (StreamHost streamHost : streamHosts) {
String address = streamHost.getAddress() + ":" + streamHost.getPort();
// check to see if this address has been blacklisted
int failures = getConnectionFailures(address);
if (CONNECTION_FAILURE_THRESHOLD > 0 && failures >= CONNECTION_FAILURE_THRESHOLD) {
continue;
}
// establish socket
try {
// build SOCKS5 client
final Socks5Client socks5Client = new Socks5Client(streamHost, digest);
// connect to SOCKS5 proxy with a timeout
socket = socks5Client.getSocket(timeout);
// set selected host
selectedHost = streamHost;
break;
} catch (TimeoutException e) {
incrementConnectionFailures(address);
} catch (IOException e) {
incrementConnectionFailures(address);
} catch (XMPPException e) {
incrementConnectionFailures(address);
}
}
// throw exception if connecting to all SOCKS5 proxies failed
if (selectedHost == null || socket == null) {
cancelRequest();
}
// send used-host confirmation
Bytestream response = createUsedHostResponse(selectedHost);
this.manager.getConnection().sendPacket(response);
return new Socks5BytestreamSession(
socket, selectedHost.getJID().equals(this.bytestreamRequest.getFrom()));
}