/**
   * Copies the content of the most recently received packet into <tt>data</tt>.
   *
   * @param buffer an optional <tt>Buffer</tt> instance associated with the specified <tt>data</tt>,
   *     <tt>offset</tt> and <tt>length</tt> and provided to the method in case the implementation
   *     would like to provide additional <tt>Buffer</tt> properties such as <tt>flags</tt>
   * @param data the <tt>byte[]</tt> that we'd like to copy the content of the packet to.
   * @param offset the position where we are supposed to start writing in <tt>data</tt>.
   * @param length the number of <tt>byte</tt>s available for writing in <tt>data</tt>.
   * @return the number of bytes read
   * @throws IOException if <tt>length</tt> is less than the size of the packet.
   */
  protected int read(Buffer buffer, byte[] data, int offset, int length) throws IOException {
    if (data == null) throw new NullPointerException("data");

    if (ioError) return -1;

    RawPacket pkt;

    synchronized (pktSyncRoot) {
      pkt = this.pkt;
      this.pkt = null;
    }

    int pktLength;

    if (pkt == null) {
      pktLength = 0;
    } else {
      // By default, pkt will be returned to the pool after it was read.
      boolean poolPkt = true;

      try {
        pktLength = pkt.getLength();
        if (length < pktLength) {
          /*
           * If pkt is still the latest RawPacket made available to
           * reading, reinstate it for the next invocation of read;
           * otherwise, return it to the pool.
           */
          poolPkt = false;
          throw new IOException("Input buffer not big enough for " + pktLength);
        } else {
          byte[] pktBuffer = pkt.getBuffer();

          if (pktBuffer == null) {
            throw new NullPointerException(
                "pkt.buffer null, pkt.length " + pktLength + ", pkt.offset " + pkt.getOffset());
          } else {
            System.arraycopy(pkt.getBuffer(), pkt.getOffset(), data, offset, pktLength);
            if (buffer != null) buffer.setFlags(pkt.getFlags());
          }
        }
      } finally {
        if (!poolPkt) {
          synchronized (pktSyncRoot) {
            if (this.pkt == null) this.pkt = pkt;
            else poolPkt = true;
          }
        }
        if (poolPkt) {
          // Return pkt to the pool because it was successfully read.
          poolRawPacket(pkt);
        }
      }
    }

    return pktLength;
  }
  /** {@inheritDoc} */
  @Override
  public RawPacket transform(RawPacket pkt) {
    byte[] buf = pkt.getBuffer();
    int off = pkt.getOffset();
    int len = pkt.getLength();

    // If the specified pkt represents a DTLS record, then it should pass
    // through this PacketTransformer (e.g. it has been sent through
    // DatagramTransportImpl).
    if (isDtlsRecord(buf, off, len)) return pkt;

    // SRTP
    if (!transformEngine.isSrtpDisabled()) {
      // DTLS-SRTP has not been initialized yet or has failed to
      // initialize.
      SinglePacketTransformer srtpTransformer = waitInitializeAndGetSRTPTransformer();

      if (srtpTransformer != null) pkt = srtpTransformer.transform(pkt);
      else if (DROP_UNENCRYPTED_PKTS) pkt = null;
      // XXX Else, it is our explicit policy to let the received packet
      // pass through and rely on the SrtpListener to notify the user that
      // the session is not secured.
    }
    // Pure/non-SRTP DTLS
    else {
      // The specified pkt will pass through this PacketTransformer only
      // if it gets transformed into a DTLS record.
      pkt = null;

      sendApplicationData(buf, off, len);
    }
    return pkt;
  }
 /**
  * Sends a specific <tt>RawPacket</tt> through this <tt>OutputDataStream</tt> to a specific
  * <tt>InetSocketAddress</tt>.
  *
  * @param packet the <tt>RawPacket</tt> to send through this <tt>OutputDataStream</tt> to the
  *     specified <tt>target</tt>
  * @param target the <tt>InetSocketAddress</tt> to which the specified <tt>packet</tt> is to be
  *     sent through this <tt>OutputDataStream</tt>
  * @throws IOException if anything goes wrong while sending the specified <tt>packet</tt> through
  *     this <tt>OutputDataStream</tt> to the specified <tt>target</tt>
  */
 @Override
 protected void sendToTarget(RawPacket packet, InetSocketAddress target) throws IOException {
   socket.send(
       new DatagramPacket(
           packet.getBuffer(),
           packet.getOffset(),
           packet.getLength(),
           target.getAddress(),
           target.getPort()));
 }
Beispiel #4
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  private void emptyPacketBuffer(long ssrc) {
    RawPacket[] pkts = rtpConnector.packetBuffer.emptyBuffer(ssrc);
    RTPConnectorImpl.OutputDataStreamImpl dataStream;

    try {
      dataStream = rtpConnector.getDataOutputStream();
    } catch (IOException ioe) {
      logger.error("Failed to empty packet buffer for SSRC=" + ssrc + ": " + ioe);
      return;
    }
    for (RawPacket pkt : pkts)
      dataStream.write(
          pkt.getBuffer(), pkt.getOffset(), pkt.getLength(), false /* already transformed */);
  }
Beispiel #5
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      @Override
      public int read(byte[] buffer, int offset, int length) throws IOException {

        RawPacket pendingPacket;
        if (isControlStream) {
          pendingPacket = pendingControlPacket;
        } else {
          pendingPacket = pendingDataPacket;
        }
        int bytesToRead = 0;
        byte[] pendingPacketBuffer = pendingPacket.getBuffer();
        if (pendingPacketBuffer != null) {
          int pendingPacketLength = pendingPacket.getLength();
          bytesToRead = length > pendingPacketLength ? pendingPacketLength : length;
          System.arraycopy(
              pendingPacketBuffer, pendingPacket.getOffset(), buffer, offset, bytesToRead);
        }
        return bytesToRead;
      }
  /**
   * Log the packet.
   *
   * @param packet packet to log
   */
  @Override
  protected void doLogPacket(RawPacket packet, InetSocketAddress target) {
    if (socket == null || packet == null || target == null) return;

    // Do not log the packet if it has been processed (and already
    // logged) by the ice4j stack.
    if (socket instanceof MultiplexingDatagramSocket) return;

    PacketLoggingService pktLogging = getPacketLoggingService();

    if (pktLogging != null) {
      pktLogging.logPacket(
          PacketLoggingService.ProtocolName.RTP,
          socket.getLocalAddress().getAddress(),
          socket.getLocalPort(),
          target.getAddress().getAddress(),
          target.getPort(),
          PacketLoggingService.TransportName.UDP,
          true,
          packet.getBuffer(),
          packet.getOffset(),
          packet.getLength());
    }
  }
  private void runOnDtlsTransport(StreamConnector connector) throws IOException {
    DtlsControlImpl dtlsControl = (DtlsControlImpl) getTransportManager().getDtlsControl(this);
    DtlsTransformEngine engine = dtlsControl.getTransformEngine();
    final DtlsPacketTransformer transformer = (DtlsPacketTransformer) engine.getRTPTransformer();

    byte[] receiveBuffer = new byte[SCTP_BUFFER_SIZE];

    if (LOG_SCTP_PACKETS) {
      System.setProperty(
          ConfigurationService.PNAME_SC_HOME_DIR_LOCATION, System.getProperty("java.io.tmpdir"));
      System.setProperty(
          ConfigurationService.PNAME_SC_HOME_DIR_NAME, SctpConnection.class.getName());
    }

    synchronized (this) {
      // FIXME local SCTP port is hardcoded in bridge offer SDP (Jitsi
      // Meet)
      sctpSocket = Sctp.createSocket(5000);
      assocIsUp = false;
      acceptedIncomingConnection = false;
    }

    // Implement output network link for SCTP stack on DTLS transport
    sctpSocket.setLink(
        new NetworkLink() {
          @Override
          public void onConnOut(SctpSocket s, byte[] packet) throws IOException {
            if (LOG_SCTP_PACKETS) {
              LibJitsi.getPacketLoggingService()
                  .logPacket(
                      PacketLoggingService.ProtocolName.ICE4J,
                      new byte[] {0, 0, 0, (byte) debugId},
                      5000,
                      new byte[] {0, 0, 0, (byte) (debugId + 1)},
                      remoteSctpPort,
                      PacketLoggingService.TransportName.UDP,
                      true,
                      packet);
            }

            // Send through DTLS transport
            transformer.sendApplicationData(packet, 0, packet.length);
          }
        });

    if (logger.isDebugEnabled()) {
      logger.debug("Connecting SCTP to port: " + remoteSctpPort + " to " + getEndpoint().getID());
    }

    sctpSocket.setNotificationListener(this);
    sctpSocket.listen();

    // FIXME manage threads
    threadPool.execute(
        new Runnable() {
          @Override
          public void run() {
            SctpSocket sctpSocket = null;
            try {
              // sctpSocket is set to null on close
              sctpSocket = SctpConnection.this.sctpSocket;
              while (sctpSocket != null) {
                if (sctpSocket.accept()) {
                  acceptedIncomingConnection = true;
                  break;
                }
                Thread.sleep(100);
                sctpSocket = SctpConnection.this.sctpSocket;
              }
              if (isReady()) {
                notifySctpConnectionReady();
              }
            } catch (Exception e) {
              logger.error("Error accepting SCTP connection", e);
            }

            if (sctpSocket == null && logger.isInfoEnabled()) {
              logger.info(
                  "SctpConnection " + getID() + " closed" + " before SctpSocket accept()-ed.");
            }
          }
        });

    // Notify that from now on SCTP connection is considered functional
    sctpSocket.setDataCallback(this);

    // Setup iceSocket
    DatagramSocket datagramSocket = connector.getDataSocket();
    if (datagramSocket != null) {
      this.iceSocket = new IceUdpSocketWrapper(datagramSocket);
    } else {
      this.iceSocket = new IceTcpSocketWrapper(connector.getDataTCPSocket());
    }

    DatagramPacket rcvPacket = new DatagramPacket(receiveBuffer, 0, receiveBuffer.length);

    // Receive loop, breaks when SCTP socket is closed
    try {
      do {
        iceSocket.receive(rcvPacket);

        RawPacket raw =
            new RawPacket(rcvPacket.getData(), rcvPacket.getOffset(), rcvPacket.getLength());

        raw = transformer.reverseTransform(raw);
        // Check for app data
        if (raw == null) continue;

        if (LOG_SCTP_PACKETS) {
          LibJitsi.getPacketLoggingService()
              .logPacket(
                  PacketLoggingService.ProtocolName.ICE4J,
                  new byte[] {0, 0, 0, (byte) (debugId + 1)},
                  remoteSctpPort,
                  new byte[] {0, 0, 0, (byte) debugId},
                  5000,
                  PacketLoggingService.TransportName.UDP,
                  false,
                  raw.getBuffer(),
                  raw.getOffset(),
                  raw.getLength());
        }

        // Pass network packet to SCTP stack
        sctpSocket.onConnIn(raw.getBuffer(), raw.getOffset(), raw.getLength());
      } while (true);
    } finally {
      // Eventually, close the socket although it should happen from
      // expire().
      synchronized (this) {
        assocIsUp = false;
        acceptedIncomingConnection = false;
        if (sctpSocket != null) {
          sctpSocket.close();
          sctpSocket = null;
        }
      }
    }
  }
  /** {@inheritDoc} */
  @Override
  public RawPacket reverseTransform(RawPacket pkt) {
    byte[] buf = pkt.getBuffer();
    int off = pkt.getOffset();
    int len = pkt.getLength();

    if (isDtlsRecord(buf, off, len)) {
      if (rtcpmux && Component.RTCP == componentID) {
        // This should never happen.
        logger.warn(
            "Dropping a DTLS record, because it was received on the"
                + " RTCP channel while rtcpmux is in use.");
        return null;
      }

      boolean receive;

      synchronized (this) {
        if (datagramTransport == null) {
          receive = false;
        } else {
          datagramTransport.queueReceive(buf, off, len);
          receive = true;
        }
      }
      if (receive) {
        DTLSTransport dtlsTransport = this.dtlsTransport;

        if (dtlsTransport == null) {
          // The specified pkt looks like a DTLS record and it has
          // been consumed for the purposes of the secure channel
          // represented by this PacketTransformer.
          pkt = null;
        } else {
          try {
            int receiveLimit = dtlsTransport.getReceiveLimit();
            int delta = receiveLimit - len;

            if (delta > 0) {
              pkt.grow(delta);
              buf = pkt.getBuffer();
              off = pkt.getOffset();
              len = pkt.getLength();
            } else if (delta < 0) {
              pkt.shrink(-delta);
              buf = pkt.getBuffer();
              off = pkt.getOffset();
              len = pkt.getLength();
            }

            int received = dtlsTransport.receive(buf, off, len, DTLS_TRANSPORT_RECEIVE_WAITMILLIS);

            if (received <= 0) {
              // No application data was decoded.
              pkt = null;
            } else {
              delta = len - received;
              if (delta > 0) pkt.shrink(delta);
            }
          } catch (IOException ioe) {
            pkt = null;
            // 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 && !tlsPeerHasRaisedCloseNotifyWarning) {
              logger.error("Failed to decode a DTLS record!", ioe);
            }
          }
        }
      } else {
        // The specified pkt looks like a DTLS record but it is
        // unexpected in the current state of the secure channel
        // represented by this PacketTransformer. This PacketTransformer
        // has not been started (successfully) or has been closed.
        pkt = null;
      }
    } else if (transformEngine.isSrtpDisabled()) {
      // In pure DTLS mode only DTLS records pass through.
      pkt = null;
    } else {
      // DTLS-SRTP has not been initialized yet or has failed to
      // initialize.
      SinglePacketTransformer srtpTransformer = waitInitializeAndGetSRTPTransformer();

      if (srtpTransformer != null) pkt = srtpTransformer.reverseTransform(pkt);
      else if (DROP_UNENCRYPTED_PKTS) pkt = null;
      // XXX Else, it is our explicit policy to let the received packet
      // pass through and rely on the SrtpListener to notify the user that
      // the session is not secured.
    }
    return pkt;
  }