/** Stops this <tt>PacketTransformer</tt>. */
private synchronized void stop() {
if (connectThread != null) connectThread = null;
try {
// The dtlsTransport and _srtpTransformer SHOULD be closed, of
// course. The datagramTransport MUST be closed.
if (dtlsTransport != null) {
try {
dtlsTransport.close();
} catch (IOException ioe) {
logger.error("Failed to (properly) close " + dtlsTransport.getClass(), ioe);
}
dtlsTransport = null;
}
if (_srtpTransformer != null) {
_srtpTransformer.close();
_srtpTransformer = null;
}
} finally {
try {
closeDatagramTransport();
} finally {
notifyAll();
}
}
}
/**
* Runs in {@link #connectThread} to initialize {@link #dtlsTransport}.
*
* @param dtlsProtocol
* @param tlsPeer
* @param datagramTransport
*/
private void runInConnectThread(
DTLSProtocol dtlsProtocol, TlsPeer tlsPeer, DatagramTransport datagramTransport) {
DTLSTransport dtlsTransport = null;
final boolean srtp = !transformEngine.isSrtpDisabled();
int srtpProtectionProfile = 0;
TlsContext tlsContext = null;
// DTLS client
if (dtlsProtocol instanceof DTLSClientProtocol) {
DTLSClientProtocol dtlsClientProtocol = (DTLSClientProtocol) dtlsProtocol;
TlsClientImpl tlsClient = (TlsClientImpl) tlsPeer;
for (int i = CONNECT_TRIES - 1; i >= 0; i--) {
if (!enterRunInConnectThreadLoop(i, datagramTransport)) break;
try {
dtlsTransport = dtlsClientProtocol.connect(tlsClient, datagramTransport);
break;
} catch (IOException ioe) {
if (!handleRunInConnectThreadException(
ioe, "Failed to connect this DTLS client to a DTLS" + " server!", i)) {
break;
}
}
}
if (dtlsTransport != null && srtp) {
srtpProtectionProfile = tlsClient.getChosenProtectionProfile();
tlsContext = tlsClient.getContext();
}
}
// DTLS server
else if (dtlsProtocol instanceof DTLSServerProtocol) {
DTLSServerProtocol dtlsServerProtocol = (DTLSServerProtocol) dtlsProtocol;
TlsServerImpl tlsServer = (TlsServerImpl) tlsPeer;
for (int i = CONNECT_TRIES - 1; i >= 0; i--) {
if (!enterRunInConnectThreadLoop(i, datagramTransport)) break;
try {
dtlsTransport = dtlsServerProtocol.accept(tlsServer, datagramTransport);
break;
} catch (IOException ioe) {
if (!handleRunInConnectThreadException(
ioe, "Failed to accept a connection from a DTLS client!", i)) {
break;
}
}
}
if (dtlsTransport != null && srtp) {
srtpProtectionProfile = tlsServer.getChosenProtectionProfile();
tlsContext = tlsServer.getContext();
}
} else {
// It MUST be either a DTLS client or a DTLS server.
throw new IllegalStateException("dtlsProtocol");
}
SinglePacketTransformer srtpTransformer =
(dtlsTransport == null || !srtp)
? null
: initializeSRTPTransformer(srtpProtectionProfile, tlsContext);
boolean closeSRTPTransformer;
synchronized (this) {
if (Thread.currentThread().equals(this.connectThread)
&& datagramTransport.equals(this.datagramTransport)) {
this.dtlsTransport = dtlsTransport;
_srtpTransformer = srtpTransformer;
notifyAll();
}
closeSRTPTransformer = (_srtpTransformer != srtpTransformer);
}
if (closeSRTPTransformer && srtpTransformer != null) srtpTransformer.close();
}