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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.java.sip.communicator.impl.protocol.jabber;
import java.util.*;
import net.java.sip.communicator.util.*;
import org.ice4j.*;
import org.ice4j.ice.*;
import org.ice4j.ice.harvest.*;
import org.ice4j.socket.*;
import org.jivesoftware.smack.*;
import org.xmpp.jnodes.smack.*;
/**
* Implements a <tt>CandidateHarvester</tt> which gathers <tt>Candidate</tt>s
* for a specified {@link Component} using Jingle Nodes as defined in
* XEP 278 "Jingle Relay Nodes".
*
* @author Sebastien Vincent
*/
public class JingleNodesHarvester
extends CandidateHarvester
{
/**
* The <tt>Logger</tt> used by the <tt>JingleNodesHarvester</tt> class and
* its instances for logging output.
*/
private static final Logger logger
= Logger.getLogger(JingleNodesHarvester.class.getName());
/**
* XMPP connection.
*/
private SmackServiceNode serviceNode = null;
/**
* JingleNodes relay allocate two address/port couple for us. Due to the
* architecture of Ice4j that harvest address for each component, we store
* the second address/port couple.
*/
private TransportAddress localAddressSecond = null;
/**
* JingleNodes relay allocate two address/port couple for us. Due to the
* architecture of Ice4j that harvest address for each component, we store
* the second address/port couple.
*/
private TransportAddress relayedAddressSecond = null;
/**
* Constructor.
*
* @param serviceNode the <tt>SmackServiceNode</tt>
*/
public JingleNodesHarvester(SmackServiceNode serviceNode)
{
this.serviceNode = serviceNode;
}
/**
* 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;
}
/**
* Creates a new <tt>JingleNodesRelayedCandidate</tt> instance which is to
* represent a specific <tt>TransportAddress</tt>.
*
* @param transportAddress the <tt>TransportAddress</tt> allocated by the
* relay
* @param component the <tt>Component</tt> for which the candidate will be
* added
* @param localEndPoint <tt>TransportAddress</tt> of the Jingle Nodes relay
* where we will send our packet.
* @return a new <tt>JingleNodesRelayedCandidate</tt> instance which
* represents the specified <tt>TransportAddress</tt>
*/
protected JingleNodesCandidate createJingleNodesCandidate(
TransportAddress transportAddress, Component component,
TransportAddress localEndPoint)
{
JingleNodesCandidate cand = null;
try
{
cand = new JingleNodesCandidate(transportAddress,
component,
localEndPoint);
IceSocketWrapper stunSocket = cand.getStunSocket(null);
cand.getStunStack().addSocket(stunSocket);
}
catch(Throwable e)
{
logger.debug(
"Exception occurred when creating JingleNodesCandidate: " +
e);
}
return cand;
}
}
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