/**
* Handles a specific <tt>IOException</tt> which was thrown during the execution of {@link
* #runInConnectThread(DTLSProtocol, TlsPeer, DatagramTransport)} while trying to establish a DTLS
* connection
*
* @param ioe the <tt>IOException</tt> to handle
* @param msg the human-readable message to log about the specified <tt>ioe</tt>
* @param i the number of tries remaining after the current one
* @return <tt>true</tt> if the specified <tt>ioe</tt> was successfully handled; <tt>false</tt>,
* otherwise
*/
private boolean handleRunInConnectThreadException(IOException ioe, String msg, int i) {
// SrtpControl.start(MediaType) starts its associated TransformEngine.
// We will use that mediaType to signal the normal stop then as well
// i.e. we will ignore exception after the procedure to stop this
// PacketTransformer has begun.
if (mediaType == null) return false;
if (ioe instanceof TlsFatalAlert) {
TlsFatalAlert tfa = (TlsFatalAlert) ioe;
short alertDescription = tfa.getAlertDescription();
if (alertDescription == AlertDescription.unexpected_message) {
msg += " Received fatal unexpected message.";
if (i == 0
|| !Thread.currentThread().equals(connectThread)
|| connector == null
|| mediaType == null) {
msg += " Giving up after " + (CONNECT_TRIES - i) + " retries.";
} else {
msg += " Will retry.";
logger.error(msg, ioe);
return true;
}
} else {
msg += " Received fatal alert " + alertDescription + ".";
}
}
logger.error(msg, ioe);
return false;
}
public DTLSTransport accept(TlsServer server, DatagramTransport transport) throws IOException {
if (server == null) {
throw new IllegalArgumentException("'server' cannot be null");
}
if (transport == null) {
throw new IllegalArgumentException("'transport' cannot be null");
}
SecurityParameters securityParameters = new SecurityParameters();
securityParameters.entity = ConnectionEnd.server;
securityParameters.serverRandom = TlsProtocol.createRandomBlock(secureRandom);
ServerHandshakeState state = new ServerHandshakeState();
state.server = server;
state.serverContext = new TlsServerContextImpl(secureRandom, securityParameters);
server.init(state.serverContext);
DTLSRecordLayer recordLayer =
new DTLSRecordLayer(transport, state.serverContext, server, ContentType.handshake);
// TODO Need to handle sending of HelloVerifyRequest without entering a full connection
try {
return serverHandshake(state, recordLayer);
} catch (TlsFatalAlert fatalAlert) {
recordLayer.fail(fatalAlert.getAlertDescription());
throw fatalAlert;
} catch (IOException e) {
recordLayer.fail(AlertDescription.internal_error);
throw e;
} catch (RuntimeException e) {
recordLayer.fail(AlertDescription.internal_error);
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
private void safeWriteMessage(short type, byte[] buf, int offset, int len) throws IOException {
try {
rs.writeMessage(type, buf, offset, len);
} catch (TlsFatalAlert e) {
if (!this.closed) {
this.failWithError(AlertLevel.fatal, e.getAlertDescription());
}
throw e;
} catch (IOException e) {
if (!closed) {
this.failWithError(AlertLevel.fatal, AlertDescription.internal_error);
}
throw e;
} catch (RuntimeException e) {
if (!closed) {
this.failWithError(AlertLevel.fatal, AlertDescription.internal_error);
}
throw e;
}
}
private void safeReadData() throws IOException {
try {
rs.readData();
} catch (TlsFatalAlert e) {
if (!this.closed) {
this.failWithError(AlertLevel.fatal, e.getAlertDescription());
}
throw e;
} catch (IOException e) {
if (!this.closed) {
this.failWithError(AlertLevel.fatal, AlertDescription.internal_error);
}
throw e;
} catch (RuntimeException e) {
if (!this.closed) {
this.failWithError(AlertLevel.fatal, AlertDescription.internal_error);
}
throw e;
}
}