/** * Determines whether {@link #runInConnectThread(DTLSProtocol, TlsPeer, DatagramTransport)} is to * try to establish a DTLS connection. * * @param i the number of tries remaining after the current one * @param datagramTransport * @return <tt>true</tt> to try to establish a DTLS connection; otherwise, <tt>false</tt> */ private boolean enterRunInConnectThreadLoop(int i, DatagramTransport datagramTransport) { if (i < 0 || i > CONNECT_TRIES) { return false; } else { Thread currentThread = Thread.currentThread(); synchronized (this) { if (i > 0 && i < CONNECT_TRIES - 1) { boolean interrupted = false; try { wait(CONNECT_RETRY_INTERVAL); } catch (InterruptedException ie) { interrupted = true; } if (interrupted) currentThread.interrupt(); } return currentThread.equals(this.connectThread) && datagramTransport.equals(this.datagramTransport); } } }
/** * 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(); }