private void test3()
throws UtilityException, SocketException, UnknownHostException, IOException,
MessageAttributeParsingException, MessageAttributeException,
MessageHeaderParsingException {
int timeSinceFirstTransmission = 0;
int timeout = timeoutInitValue;
while (true) {
try {
// Test 3 including response
DatagramSocket sendSocket = new DatagramSocket(new InetSocketAddress(localAddress, 0));
sendSocket.connect(InetAddress.getByName(stunServer), stunPort);
sendSocket.setSoTimeout(timeout);
MessageHeader sendMH = new MessageHeader(MessageHeader.MessageHeaderType.BindingRequest);
sendMH.generateTransactionID();
ChangeRequest changeRequest = new ChangeRequest();
changeRequest.setChangePort();
sendMH.addMessageAttribute(changeRequest);
byte[] data = sendMH.getBytes();
DatagramPacket send = new DatagramPacket(data, data.length);
sendSocket.send(send);
LOGGER.debug("Test 3: Binding Request sent.");
int localPort = sendSocket.getLocalPort();
InetAddress localAddress = sendSocket.getLocalAddress();
sendSocket.close();
DatagramSocket receiveSocket = new DatagramSocket(localPort, localAddress);
receiveSocket.connect(InetAddress.getByName(stunServer), ca.getPort());
receiveSocket.setSoTimeout(timeout);
MessageHeader receiveMH = new MessageHeader();
while (!(receiveMH.equalTransactionID(sendMH))) {
DatagramPacket receive = new DatagramPacket(new byte[200], 200);
receiveSocket.receive(receive);
receiveMH = MessageHeader.parseHeader(receive.getData());
receiveMH.parseAttributes(receive.getData());
}
ErrorCode ec =
(ErrorCode)
receiveMH.getMessageAttribute(MessageAttribute.MessageAttributeType.ErrorCode);
if (ec != null) {
di.setError(ec.getResponseCode(), ec.getReason());
LOGGER.debug("Message header contains an Errorcode message attribute.");
return;
}
if (nodeNatted) {
di.setRestrictedCone();
LOGGER.debug("Node is behind a restricted NAT.");
return;
}
} catch (SocketTimeoutException ste) {
if (timeSinceFirstTransmission < timeoutTest) {
LOGGER.debug("Test 3: Socket timeout while receiving the response.");
timeSinceFirstTransmission += timeout;
int timeoutAddValue = (timeSinceFirstTransmission * 2);
if (timeoutAddValue > timeoutSecond) // 1600)
timeoutAddValue = timeoutSecond;
timeout = timeoutAddValue;
} else {
LOGGER.debug(
"Test 3: Socket timeout while receiving the response. Maximum retry limit exceed. Give up.");
di.setPortRestrictedCone();
LOGGER.debug("Node is behind a port restricted NAT.");
return;
}
}
}
}
private boolean test2()
throws UtilityException, SocketException, UnknownHostException, IOException,
MessageAttributeParsingException, MessageAttributeException,
MessageHeaderParsingException {
int timeSinceFirstTransmission = 0;
int timeout = timeoutInitValue;
while (true) {
try {
// Test 2 including response
DatagramSocket sendSocket = new DatagramSocket(new InetSocketAddress(localAddress, 0));
sendSocket.connect(InetAddress.getByName(stunServer), stunPort);
sendSocket.setSoTimeout(timeout);
MessageHeader sendMH = new MessageHeader(MessageHeader.MessageHeaderType.BindingRequest);
sendMH.generateTransactionID();
ChangeRequest changeRequest = new ChangeRequest();
changeRequest.setChangeIP();
changeRequest.setChangePort();
sendMH.addMessageAttribute(changeRequest);
byte[] data = sendMH.getBytes();
DatagramPacket send = new DatagramPacket(data, data.length);
sendSocket.send(send);
LOGGER.debug("Test 2: Binding Request sent.");
int localPort = sendSocket.getLocalPort();
InetAddress localAddress = sendSocket.getLocalAddress();
sendSocket.close();
DatagramSocket receiveSocket = new DatagramSocket(localPort, localAddress);
receiveSocket.connect(ca.getAddress().getInetAddress(), ca.getPort());
receiveSocket.setSoTimeout(timeout);
MessageHeader receiveMH = new MessageHeader();
while (!(receiveMH.equalTransactionID(sendMH))) {
DatagramPacket receive = new DatagramPacket(new byte[200], 200);
receiveSocket.receive(receive);
receiveMH = MessageHeader.parseHeader(receive.getData());
receiveMH.parseAttributes(receive.getData());
}
ErrorCode ec =
(ErrorCode)
receiveMH.getMessageAttribute(MessageAttribute.MessageAttributeType.ErrorCode);
if (ec != null) {
di.setError(ec.getResponseCode(), ec.getReason());
LOGGER.debug("Message header contains an Errorcode message attribute.");
return false;
}
if (!nodeNatted) {
di.setOpenAccess();
LOGGER.debug(
"Node has open access to the Internet (or, at least the node is behind a full-cone NAT without translation).");
} else {
di.setFullCone();
LOGGER.debug("Node is behind a full-cone NAT.");
}
return false;
} catch (SocketTimeoutException ste) {
if (timeSinceFirstTransmission < timeoutTest) {
LOGGER.debug("Test 2: Socket timeout while receiving the response.");
timeSinceFirstTransmission += timeout;
int timeoutAddValue = (timeSinceFirstTransmission * 2);
if (timeoutAddValue > timeoutSecond) // 1600)
timeoutAddValue = timeoutSecond;
timeout = timeoutAddValue;
} else {
LOGGER.debug(
"Test 2: Socket timeout while receiving the response. Maximum retry limit exceed. Give up.");
if (!nodeNatted) {
di.setSymmetricUDPFirewall();
LOGGER.debug("Node is behind a symmetric UDP firewall.");
return false;
} else {
// not is natted
// redo test 1 with address and port as offered in the changed-address message attribute
return true;
}
}
}
}
}