/*
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 2002 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by SuperBonBon Industries (http://www.sbbi.net/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "UPNPLib" and "SuperBonBon Industries" must not be
* used to endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* info@sbbi.net.
*
* 5. Products derived from this software may not be called
* "SuperBonBon Industries", nor may "SBBI" appear in their name,
* without prior written permission of SuperBonBon Industries.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT,INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* on behalf of SuperBonBon Industries. For more information on
* SuperBonBon Industries, please see <http://www.sbbi.net/>.
*/
package net.sbbi.upnp;
import java.net.*;
import java.io.*;
import java.util.*;
import net.sbbi.upnp.devices.*;
import org.apache.commons.logging.*;
/**
* Class to discover an UPNP device on the network.</br>
* A multicast socket will be created to discover devices, the binding port for this socket is set to 1901,
* if this is causing a problem you can use the net.sbbi.upnp.Discovery.bindPort system property
* to specify another port.
* The discovery methods only accept matching device description and broadcast message response IP
* to avoid a security flaw with the protocol. If you are not happy with such behaviour
* you can set the net.sbbi.upnp.ddos.matchip system property to false to avoid this check.
* @author <a href="mailto:superbonbon@sbbi.net">SuperBonBon</a>
* @version 1.0
*/
public class Discovery {
private final static Log log = LogFactory.getLog( Discovery.class );
public final static String ROOT_DEVICES = "upnp:rootdevice";
public final static String ALL_DEVICES = "ssdp:all";
public static final int DEFAULT_MX = 3;
public static final int DEFAULT_TTL = 4;
public static final int DEFAULT_TIMEOUT = 1500;
public static final String DEFAULT_SEARCH = ALL_DEVICES;
public static final int DEFAULT_SSDP_SEARCH_PORT = 1901;
public final static String SSDP_IP = "239.255.255.250";
public final static int SSDP_PORT = 1900;
/**
* Devices discovering on all network interfaces with default values, all root devices will be searched
* @return an array of UPNP Root device or null if nothing found with the default timeout.
* Null does NOT means that no UPNP device is available on the network. It only means
* that for this default timeout no devices responded or that effectively no devices
* are available at all.
* @throws IOException if some IOException occurs during discovering
*/
public static UPNPRootDevice[] discover() throws IOException {
return discover( DEFAULT_TIMEOUT, DEFAULT_TTL, DEFAULT_MX, DEFAULT_SEARCH );
}
/**
* Devices discovering on all network interfaces with a given root device to search
* @param searchTarget the device URI to search
* @return an array of UPNP Root device that matches the search or null if nothing found with the default timeout.
* Null does NOT means that no UPNP device is available on the network. It only means
* that for this given timeout no devices responded or that effectively no devices
* are available at all.
* @throws IOException if some IOException occurs during discovering
*/
public static UPNPRootDevice[] discover( String searchTarget ) throws IOException {
return discover( DEFAULT_TIMEOUT, DEFAULT_TTL, DEFAULT_MX, searchTarget );
}
/**
* Devices discovering on all network interfaces with a given timeout and a given root device to search
* @param timeOut the time allowed for a device to give a response
* @param searchTarget the device URI to search
* @return an array of UPNP Root device that matches the search or null if nothing found with the given timeout.
* Null does NOT means that no UPNP device is available on the network. It only means
* that for this given timeout no devices responded or that effectively no devices
* are available at all.
* @throws IOException if some IOException occurs during discovering
*/
public static UPNPRootDevice[] discover( int timeOut, String searchTarget ) throws IOException {
return discover( timeOut, DEFAULT_TTL, DEFAULT_MX, searchTarget );
}
/**
* Devices discovering on all network interfaces with a given timeout and a given root device to search, as well as a ttl and mx param
* @param timeOut the timeout for the a device to give a reponse
* @param ttl the UDP socket packets time to live
* @param mx discovery message mx http header field value
* @param searchTarget the device URI to search
* @return an array of UPNP Root device that matches the search or null if nothing found within the given timeout.
* Null return does NOT means that no UPNP device is available on the network. It only means
* that for this given timeout no devices responded or that effectively no devices
* are available at all.
* @throws IOException if some IOException occurs during discovering
*/
public static UPNPRootDevice[] discover( int timeOut, int ttl, int mx, String searchTarget ) throws IOException {
return discoverDevices( timeOut, ttl, mx, searchTarget, null );
}
/**
* Devices discovering with a given timeout and a given root device to search on an given network interface, as well as a ttl and mx param
* @param timeOut the timeout for the a device to give a reponse
* @param ttl the UDP socket packets time to live
* @param mx discovery message mx http header field value
* @param searchTarget the device URI to search
* @param ni the networkInterface where to search devices, null to lookup all interfaces
* @return an array of UPNP Root device that matches the search or null if nothing found within the given timeout.
* Null return does NOT means that no UPNP device is available on the network. It only means
* that for this given timeout no devices responded or that effectively no devices
* are available at all.
* @throws IOException if some IOException occurs during discovering
*/
public static UPNPRootDevice[] discover( int timeOut, int ttl, int mx, String searchTarget, NetworkInterface ni ) throws IOException {
return discoverDevices( timeOut, ttl, mx, searchTarget, ni );
}
private static UPNPRootDevice[] discoverDevices( int timeOut, int ttl, int mx, String searchTarget, NetworkInterface ni ) throws IOException {
if ( searchTarget == null || searchTarget.trim().length() == 0 ) {
throw new IllegalArgumentException( "Illegal searchTarget" );
}
final Map devices = new HashMap();
DiscoveryResultsHandler handler = new DiscoveryResultsHandler() {
public void discoveredDevice( String usn, String udn, String nt, String maxAge, URL location, String firmware ) {
synchronized( devices ) {
if ( ! devices.containsKey( usn ) ) {
try {
UPNPRootDevice device = new UPNPRootDevice( location, maxAge, firmware, usn, udn );
devices.put( usn, device );
} catch ( Exception ex ) {
log.error( "Error occured during upnp root device object creation from location " + location, ex );
}
}
}
}
};
DiscoveryListener.getInstance().registerResultsHandler( handler, searchTarget );
if ( ni == null ) {
for ( Enumeration e = NetworkInterface.getNetworkInterfaces(); e.hasMoreElements(); ) {
NetworkInterface intf = (NetworkInterface)e.nextElement();
for ( Enumeration adrs = intf.getInetAddresses(); adrs.hasMoreElements(); ) {
InetAddress adr = (InetAddress)adrs.nextElement();
if ( adr instanceof Inet4Address && !adr.isLoopbackAddress() ) {
sendSearchMessage( adr, ttl, mx, searchTarget );
}
}
}
} else {
for ( Enumeration adrs = ni.getInetAddresses(); adrs.hasMoreElements(); ) {
InetAddress adr = (InetAddress)adrs.nextElement();
if ( adr instanceof Inet4Address && !adr.isLoopbackAddress() ) {
sendSearchMessage( adr, ttl, mx, searchTarget );
}
}
}
try {
Thread.sleep( timeOut );
} catch ( InterruptedException ex ) {
// don't care
}
DiscoveryListener.getInstance().unRegisterResultsHandler( handler, searchTarget );
if ( devices.size() == 0 ) {
return null;
}
int j = 0;
UPNPRootDevice[] rootDevices = new UPNPRootDevice[devices.size()];
for ( Iterator i = devices.values().iterator(); i.hasNext(); ) {
rootDevices[j++] = (UPNPRootDevice)i.next();
}
return rootDevices;
}
/**
* Sends an SSDP search message on the network
* @param src the sender ip
* @param ttl the time to live
* @param mx the mx field
* @param searchTarget the search target
* @throws IOException if some IO errors occurs during search
*/
public static void sendSearchMessage( InetAddress src, int ttl, int mx, String searchTarget ) throws IOException {
int bindPort = DEFAULT_SSDP_SEARCH_PORT;
String port = System.getProperty( "net.sbbi.upnp.Discovery.bindPort" );
if ( port != null ) {
bindPort = Integer.parseInt( port );
}
InetSocketAddress adr = new InetSocketAddress( InetAddress.getByName( Discovery.SSDP_IP ), Discovery.SSDP_PORT );
java.net.MulticastSocket skt = new java.net.MulticastSocket( null );
skt.bind( new InetSocketAddress( src, bindPort ) );
skt.setTimeToLive( ttl );
StringBuffer packet = new StringBuffer();
packet.append( "M-SEARCH * HTTP/1.1\r\n" );
packet.append( "HOST: 239.255.255.250:1900\r\n" );
packet.append( "MAN: \"ssdp:discover\"\r\n" );
packet.append( "MX: ").append( mx ).append( "\r\n" );
packet.append( "ST: " ).append( searchTarget ).append( "\r\n" ).append( "\r\n" );
if ( log.isDebugEnabled() ) log.debug( "Sending discovery message on 239.255.255.250:1900 multicast address form ip " + src.getHostAddress() + ":\n" + packet.toString() );
String toSend = packet.toString();
byte[] pk = toSend.getBytes();
skt.send( new DatagramPacket( pk, pk.length, adr ) );
skt.disconnect();
skt.close();
}
}