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package zutil.net.ssdp;
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import java.io.IOException;
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import java.net.DatagramPacket;
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import java.net.InetAddress;
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import java.util.HashMap;
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import java.util.Timer;
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import java.util.TimerTask;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import zutil.io.MultiPrintStream;
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import zutil.io.StringOutputStream;
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import zutil.log.LogUtil;
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import zutil.net.http.HTTPHeaderParser;
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import zutil.net.http.HttpPrintStream;
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import zutil.net.threaded.ThreadedUDPNetworkThread;
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import zutil.net.threaded.ThreadedUDPNetwork;
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/**
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* A Server class that announces an service by the SSDP
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* protocol specified at:
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* http://coherence.beebits.net/chrome/site/draft-cai-ssdp-v1-03.txt
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* ftp://ftp.pwg.org/pub/pwg/www/hypermail/ps/att-0188/01-psi_SSDP.pdf
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*
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* @author Ziver
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*
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* ********* Message clarification:
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* ****** Incoming:
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* ST: Search Target, this is object of the discovery request, (e.g., ssdp:all, etc.)
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* HOST: This is the SSDP multicast address
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* MAN: Description of packet type, (e.g., "ssdp:discover", )
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* MX: Wait these few seconds and then send response
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*
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* ****** Outgoing:
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* EXT: required by HTTP - not used with SSDP
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* SERVER: informational
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* LOCATION: This is the URL to request the QueryEndpointsInterface endpoint
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* USN: advertisement UUID
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* CACHE-CONTROL: max-age = seconds until advertisement expires
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* NT: Notify target same as ST
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* NTS: same as Man but for Notify messages
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*/
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public class SSDPServer extends ThreadedUDPNetwork implements ThreadedUDPNetworkThread{
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public static final Logger logger = LogUtil.getLogger();
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public static final String SERVER_INFO = "SSDP Java Server by Ziver Koc";
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public static final int DEFAULT_CACHE_TIME = 60*30; // 30 min
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public static final int BUFFER_SIZE = 512;
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public static final String SSDP_MULTICAST_ADDR = "239.255.255.250";
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public static final int SSDP_PORT = 1900;
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// instance specific values
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private int cache_time;
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private NotifyTimer notifyTimer = null;
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/** HashMap that contains services as < SearchTargetName, SSDPServiceInfo > */
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private HashMap<String, SSDPServiceInfo> services;
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public static void main(String[] args) throws IOException{
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SSDPServer ssdp = new SSDPServer();
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StandardSSDPInfo service = new StandardSSDPInfo();
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service.setLocation("nowhere");
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service.setST("upnp:rootdevice");
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ssdp.addService(service);
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ssdp.start();
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MultiPrintStream.out.println("SSDP Server running");
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}
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public SSDPServer() throws IOException{
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super( null, SSDP_MULTICAST_ADDR, SSDP_PORT );
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super.setThread( this );
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services = new HashMap<String, SSDPServiceInfo>();
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setChacheTime( DEFAULT_CACHE_TIME );
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enableNotify( true );
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}
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/**
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* Adds an service that will be announced.
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*
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* @param searchTarget is the ST value in SSDP
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* @param location is the location of the service
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*/
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public void addService(SSDPServiceInfo service){
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services.put( service.getSearchTarget(), service );
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}
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/**
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* Remove a service from being announced. This function will
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* send out an byebye message to the clients that the service is down.
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*
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* @param searchTarget is the ST value in SSDP
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*/
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public void removeService(String searchTarget){
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sendByeBye( searchTarget );
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services.remove( searchTarget );
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}
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/**
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* Sets the cache time that will be sent to
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* the clients. If notification is enabled then an
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* notification message will be sent every cache_time/2 seconds
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*
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* @param time is the time in seconds
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*/
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public void setChacheTime(int time){
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cache_time = time;
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if( isNotifyEnabled() ){
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enableNotify(false);
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enableNotify(true);
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}
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}
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/**
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* Enable or disable notification messages to clients
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* every cache_time/2 seconds
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*/
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public void enableNotify(boolean enable){
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if( enable && notifyTimer==null ){
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notifyTimer = new NotifyTimer();
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Timer timer = new Timer();
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timer.schedule(new NotifyTimer(), 0, cache_time*1000/2);
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}else if( !enable && notifyTimer!=null ){
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notifyTimer.cancel();
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notifyTimer = null;
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}
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}
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/**
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* @return if notification messages is enabled
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*/
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public boolean isNotifyEnabled(){
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return notifyTimer != null;
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}
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/**
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* Handles the incoming packets like this:
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*
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* ***** REQUEST:
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* M-SEARCH * HTTP/1.1
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* Host: 239.255.255.250:reservedSSDPport
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* Man: "ssdp:discover"
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* ST: ge:fridge
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* MX: 3
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*
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* ***** RESPONSE;
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* HTTP/1.1 200 OK
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* Ext:
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* Cache-Control: no-cache="Ext", max-age = 5000
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* ST: ge:fridge
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* USN: uuid:abcdefgh-7dec-11d0-a765-00a0c91e6bf6
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* Location: http://localhost:80
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*
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*/
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public void receivedPacket(DatagramPacket packet, ThreadedUDPNetwork network) {
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try {
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String msg = new String( packet.getData() );
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HTTPHeaderParser header = new HTTPHeaderParser( msg );
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logger.log(Level.FINEST, "**** Received:\n"+header);
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// ******* Respond
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// Check that the message is an ssdp discovery message
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if( header.getRequestType().equalsIgnoreCase("M-SEARCH") ){
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String man = header.getHeader("Man").replace("\"", "");
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String st = header.getHeader("ST");
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// Check that its the correct URL and that its an ssdp:discover message
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if( header.getRequestURL().equals("*") && man.equalsIgnoreCase("ssdp:discover") ){
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// Check if the requested service exists
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if( services.containsKey( st ) ){
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// Generate the SSDP response
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StringOutputStream response = new StringOutputStream();
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HttpPrintStream http = new HttpPrintStream( response );
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http.setStatusCode(200);
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http.setHeader("Server", SERVER_INFO );
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http.setHeader("ST", st );
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http.setHeader("Location", services.get(st).getLocation() );
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http.setHeader("EXT", "" );
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http.setHeader("Cache-Control", "max-age = "+cache_time );
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http.setHeader("USN", services.get(st).getUSN() );
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http.close();
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logger.log(Level.FINEST, "********** Response:\n"+response);
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byte[] data = response.toString().getBytes();
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packet = new DatagramPacket(
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data, data.length,
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packet.getAddress(),
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packet.getPort());
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network.send( packet );
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}
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}
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* This thread is a timer task that sends an
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* notification message to the network every
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* cache_time/2 seconds.
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*
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* @author Ziver
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*/
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private class NotifyTimer extends TimerTask {
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public void run(){
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sendNotify();
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}
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}
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/**
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* Sends keepalive messages to update the cache of the clients
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*/
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public void sendNotify(){
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for(String st : services.keySet()){
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sendNotify( st );
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}
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}
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/**
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* Sends an keepalive message to update the cache of the clients
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*
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* @param searchTarget is the ST value of the service
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*
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* ********** Message ex:
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* NOTIFY * HTTP/1.1
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* Host: 239.255.255.250:reservedSSDPport
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* NT: blenderassociation:blender
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* NTS: ssdp:alive
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* USN: someunique:idscheme3
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* Location: http://localhost:80
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* Cache-Control: max-age = 7393
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*/
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public void sendNotify(String searchTarget){
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try {
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// Generate the SSDP response
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StringOutputStream msg = new StringOutputStream();
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HttpPrintStream http = new HttpPrintStream( msg, HttpPrintStream.HTTPMessageType.REQUEST );
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http.setRequestType("NOTIFY");
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http.setRequestURL("*");
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http.setHeader("Server", SERVER_INFO );
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http.setHeader("Host", SSDP_MULTICAST_ADDR+":"+SSDP_PORT );
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http.setHeader("NT", searchTarget );
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http.setHeader("NTS", "ssdp:alive" );
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http.setHeader("Location", services.get(searchTarget).getLocation() );
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http.setHeader("Cache-Control", "max-age = "+cache_time );
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http.setHeader("USN", services.get(searchTarget).getUSN() );
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http.close();
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logger.log(Level.FINEST, "******** Notification:\n"+msg);
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byte[] data = msg.toString().getBytes();
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DatagramPacket packet = new DatagramPacket(
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data, data.length,
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InetAddress.getByName( SSDP_MULTICAST_ADDR ),
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SSDP_PORT );
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super.send( packet );
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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/**
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* Shutdown message is sent to the clients that all
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* the service is shutting down.
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*/
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public void sendByeBye(){
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for(String st : services.keySet()){
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sendByeBye( st );
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}
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}
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/**
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* Shutdown message is sent to the clients that the service is shutting down
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*
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* @param searchTarget is the ST value of the service
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*
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* ********** Message ex:
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* NOTIFY * HTTP/1.1
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* Host: 239.255.255.250:reservedSSDPport
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* NT: someunique:idscheme3
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* NTS: ssdp:byebye
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* USN: someunique:idscheme3
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*/
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public void sendByeBye(String searchTarget){
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try {
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// Generate the SSDP response
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StringOutputStream msg = new StringOutputStream();
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HttpPrintStream http = new HttpPrintStream( msg, HttpPrintStream.HTTPMessageType.REQUEST );
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http.setRequestType("NOTIFY");
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http.setRequestURL("*");
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http.setHeader("Server", SERVER_INFO );
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http.setHeader("Host", SSDP_MULTICAST_ADDR+":"+SSDP_PORT );
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http.setHeader("NT", searchTarget );
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http.setHeader("NTS", "ssdp:byebye" );
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http.setHeader("USN", services.get(searchTarget).getUSN() );
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http.close();
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logger.log(Level.FINEST, "******** ByeBye:\n"+msg);
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byte[] data = msg.toString().getBytes();
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DatagramPacket packet = new DatagramPacket(
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data, data.length,
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InetAddress.getByName( SSDP_MULTICAST_ADDR ),
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SSDP_PORT );
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super.send( packet );
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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