/**
* Handles a specific STUN error <tt>Response</tt> with error code "401 Unauthorized" to a
* specific STUN <tt>Request</tt>.
*
* @param response the received STUN error <tt>Response</tt> with error code "401 Unauthorized"
* which is to be handled
* @param request the STUN <tt>Request</tt> to which <tt>response</tt> responds
* @param transactionID the <tt>TransactionID</tt> of <tt>response</tt> and <tt>request</tt>
* because <tt>response</tt> and <tt>request</tt> only have it as a <tt>byte</tt> array and
* <tt>TransactionID</tt> is required for the <tt>applicationData</tt> property value
* @return <tt>true</tt> if the specified STUN error <tt>response</tt> was successfully handled;
* <tt>false</tt>, otherwise
* @throws StunException if anything goes wrong while handling the specified "401 Unauthorized"
* error <tt>response</tt>
*/
private boolean processUnauthorized(
Response response, Request request, TransactionID transactionID) throws StunException {
/*
* If the response is a challenge, retry the request with a new
* transaction.
*/
boolean challenge = true;
/*
* The client SHOULD omit the USERNAME, MESSAGE-INTEGRITY, REALM, and
* NONCE attributes from the "First Request".
*/
if (request.getAttributeCount() > 0) {
char[] excludedRequestAttributeTypes =
new char[] {
Attribute.USERNAME, Attribute.MESSAGE_INTEGRITY, Attribute.REALM, Attribute.NONCE
};
for (char excludedRequestAttributeType : excludedRequestAttributeTypes) {
if (request.containsAttribute(excludedRequestAttributeType)) {
challenge = false;
break;
}
}
}
return (challenge && processChallenge(response, request, transactionID));
}
/**
* Handles a specific STUN error <tt>Response</tt> with error code "438 Stale Nonce" to a specific
* STUN <tt>Request</tt>.
*
* @param response the received STUN error <tt>Response</tt> with error code "438 Stale Nonce"
* which is to be handled
* @param request the STUN <tt>Request</tt> to which <tt>response</tt> responds
* @param transactionID the <tt>TransactionID</tt> of <tt>response</tt> and <tt>request</tt>
* because <tt>response</tt> and <tt>request</tt> only have it as a <tt>byte</tt> array and
* <tt>TransactionID</tt> is required for the <tt>applicationData</tt> property value
* @return <tt>true</tt> if the specified STUN error <tt>response</tt> was successfully handled;
* <tt>false</tt>, otherwise
* @throws StunException if anything goes wrong while handling the specified "438 Stale Nonce"
* error <tt>response</tt>
*/
private boolean processStaleNonce(Response response, Request request, TransactionID transactionID)
throws StunException {
/*
* The request MUST contain USERNAME, REALM, NONCE and MESSAGE-INTEGRITY
* attributes.
*/
boolean challenge;
if (request.getAttributeCount() > 0) {
char[] includedRequestAttributeTypes =
new char[] {
Attribute.USERNAME, Attribute.REALM, Attribute.NONCE, Attribute.MESSAGE_INTEGRITY
};
challenge = true;
for (char includedRequestAttributeType : includedRequestAttributeTypes) {
if (!request.containsAttribute(includedRequestAttributeType)) {
challenge = false;
break;
}
}
} else challenge = false;
return (challenge && processChallenge(response, request, transactionID));
}