001/**
002 *
003 * Copyright 2003-2005 Jive Software.
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smackx.jingleold.nat;
018
019import java.net.Inet6Address;
020import java.net.InetAddress;
021import java.net.NetworkInterface;
022import java.net.SocketException;
023import java.util.Enumeration;
024import java.util.Random;
025import java.util.logging.Level;
026import java.util.logging.Logger;
027
028import org.jivesoftware.smack.SmackException;
029import org.jivesoftware.smack.SmackException.NotConnectedException;
030import org.jivesoftware.smack.XMPPConnection;
031import org.jivesoftware.smack.XMPPException;
032import org.jivesoftware.smack.XMPPException.XMPPErrorException;
033
034import org.jivesoftware.smackx.jingleold.JingleSession;
035
036/**
037 * Bridged Resolver use a RTPBridge Service to add a relayed candidate.
038 * A very reliable solution for NAT Traversal.
039 *
040 * The resolver verify is the XMPP Server that the client is connected offer this service.
041 * If the server supports, a candidate is requested from the service.
042 * The resolver adds this candidate
043 */
044public class BridgedResolver extends TransportResolver {
045    private static final Logger LOGGER = Logger.getLogger(BridgedResolver.class.getName());
046
047    private final XMPPConnection connection;
048
049    private final Random random = new Random();
050
051    private long sid;
052
053    /**
054     * Constructor.
055     * A Bridged Resolver need an XMPPConnection to connect to a RTP Bridge.
056     */
057    public BridgedResolver(XMPPConnection connection) {
058        super();
059        this.connection = connection;
060    }
061
062    /**1
063     * Resolve Bridged Candidate.
064     *
065     * The BridgedResolver takes the IP address and ports of a jmf proxy service.
066     * @throws NotConnectedException
067     * @throws InterruptedException
068     */
069    @Override
070    public synchronized void resolve(JingleSession session) throws XMPPException, NotConnectedException, InterruptedException {
071
072        setResolveInit();
073
074        clearCandidates();
075
076        sid = Math.abs(random.nextLong());
077
078        RTPBridge rtpBridge = RTPBridge.getRTPBridge(connection, String.valueOf(sid));
079
080        String localIp = getLocalHost();
081
082        TransportCandidate localCandidate = new TransportCandidate.Fixed(
083                rtpBridge.getIp(), rtpBridge.getPortA());
084        localCandidate.setLocalIp(localIp);
085
086        TransportCandidate remoteCandidate = new TransportCandidate.Fixed(
087                rtpBridge.getIp(), rtpBridge.getPortB());
088        remoteCandidate.setLocalIp(localIp);
089
090        localCandidate.setSymmetric(remoteCandidate);
091        remoteCandidate.setSymmetric(localCandidate);
092
093        localCandidate.setPassword(rtpBridge.getPass());
094        remoteCandidate.setPassword(rtpBridge.getPass());
095
096        localCandidate.setSessionId(rtpBridge.getSid());
097        remoteCandidate.setSessionId(rtpBridge.getSid());
098
099        localCandidate.setConnection(this.connection);
100        remoteCandidate.setConnection(this.connection);
101
102        addCandidate(localCandidate);
103
104        setResolveEnd();
105    }
106
107    @Override
108    public void initialize() throws SmackException, XMPPErrorException, InterruptedException {
109
110        clearCandidates();
111
112        if (!RTPBridge.serviceAvailable(connection)) {
113            setInitialized();
114            throw new SmackException("No RTP Bridge service available");
115        }
116        setInitialized();
117
118    }
119
120    @Override
121    public void cancel() throws XMPPException {
122        // Nothing to do here
123    }
124
125    public static String getLocalHost() {
126        Enumeration<NetworkInterface> ifaces = null;
127
128        try {
129            ifaces = NetworkInterface.getNetworkInterfaces();
130        }
131        catch (SocketException e) {
132            LOGGER.log(Level.WARNING, "exception", e);
133        }
134
135        while (ifaces.hasMoreElements()) {
136
137            NetworkInterface iface = ifaces.nextElement();
138            Enumeration<InetAddress> iaddresses = iface.getInetAddresses();
139
140            while (iaddresses.hasMoreElements()) {
141                InetAddress iaddress = iaddresses.nextElement();
142                if (!iaddress.isLoopbackAddress() && !iaddress.isLinkLocalAddress() && !iaddress.isSiteLocalAddress() && !(iaddress instanceof Inet6Address)) {
143                    return iaddress.getHostAddress();
144                }
145            }
146        }
147
148        try {
149            return InetAddress.getLocalHost().getHostAddress();
150        }
151        catch (Exception e) {
152            LOGGER.log(Level.WARNING, "exception", e);
153        }
154
155        return "127.0.0.1";
156
157    }
158
159}