/**
  * Checks whether the carbon is supported by the server or not.
  *
  * @return <tt>true</tt> if carbon is supported by the server and <tt>false</tt> if not.
  */
 private boolean isCarbonSupported() {
   try {
     return jabberProvider
         .getDiscoveryManager()
         .discoverInfo(jabberProvider.getAccountID().getService())
         .containsFeature(CarbonPacketExtension.NAMESPACE);
   } catch (XMPPException e) {
     logger.warn("Failed to retrieve carbon support." + e.getMessage());
   }
   return false;
 }
예제 #2
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  /**
   * Gathers Jingle Nodes candidates for all host <tt>Candidate</tt>s that are already present in
   * the specified <tt>component</tt>. This method relies on the specified <tt>component</tt> to
   * already contain all its host candidates so that it would resolve them.
   *
   * @param component the {@link Component} that we'd like to gather candidate Jingle Nodes
   *     <tt>Candidate</tt>s for
   * @return the <tt>LocalCandidate</tt>s gathered by this <tt>CandidateHarvester</tt>
   */
  @Override
  public synchronized Collection<LocalCandidate> harvest(Component component) {
    logger.info("harvest Jingle Nodes");

    Collection<LocalCandidate> candidates = new HashSet<LocalCandidate>();
    String ip = null;
    int port = -1;

    /* if we have already a candidate (RTCP) allocated, get it */
    if (localAddressSecond != null && relayedAddressSecond != null) {
      LocalCandidate candidate =
          createJingleNodesCandidate(relayedAddressSecond, component, localAddressSecond);

      // try to add the candidate to the component and then only add it to
      // the harvest not redundant (not sure how it could be red. but ...)
      if (component.addLocalCandidate(candidate)) {
        candidates.add(candidate);
      }

      localAddressSecond = null;
      relayedAddressSecond = null;
      return candidates;
    }

    XMPPConnection conn = serviceNode.getConnection();
    JingleChannelIQ ciq = null;

    if (serviceNode != null) {
      final TrackerEntry preferred = serviceNode.getPreferedRelay();

      if (preferred != null) {
        ciq = SmackServiceNode.getChannel(conn, preferred.getJid());
      }
    }

    if (ciq != null) {
      ip = ciq.getHost();
      port = ciq.getRemoteport();

      if (logger.isInfoEnabled()) {
        logger.info(
            "JN relay: " + ip + " remote port:" + port + " local port: " + ciq.getLocalport());
      }

      if (ip == null || ciq.getRemoteport() == 0) {
        logger.warn("JN relay ignored because ip was null or port 0");
        return candidates;
      }

      // Drop the scope or interface name if the relay sends it
      // along in its IPv6 address. The scope/ifname is only valid on the
      // host that owns the IP and we don't need it here.
      int scopeIndex = ip.indexOf('%');
      if (scopeIndex > 0) {
        logger.warn("Dropping scope from assumed IPv6 address " + ip);
        ip = ip.substring(0, scopeIndex);
      }

      /* RTP */
      TransportAddress relayedAddress = new TransportAddress(ip, port, Transport.UDP);
      TransportAddress localAddress = new TransportAddress(ip, ciq.getLocalport(), Transport.UDP);

      LocalCandidate local = createJingleNodesCandidate(relayedAddress, component, localAddress);

      /* RTCP */
      relayedAddressSecond = new TransportAddress(ip, port + 1, Transport.UDP);
      localAddressSecond = new TransportAddress(ip, ciq.getLocalport() + 1, Transport.UDP);

      // try to add the candidate to the component and then only add it to
      // the harvest not redundant (not sure how it could be red. but ...)
      if (component.addLocalCandidate(local)) {
        candidates.add(local);
      }
    }

    return candidates;
  }