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import java.lang.Thread;
import java.net.*;
import java.io.*;
import java.util.StringTokenizer;
import gnu.regexp.*;
import gnu.getopt.*;
class TestNet implements Runnable {
private String domain;
private boolean watcherrunning = false;
private boolean isMulticastAddress = false;
private Thread broadcastListener ;
private DatagramSocket broadcast; /* supervision socket */
// it can also be a MulticastSocket, which inherits from the previous
public void run() {
byte buf[] = new byte[256];
DatagramPacket packet=new DatagramPacket(buf, 256);
int port;
String s = "Server waiting for Broadcast on "+domain;
s+=(isMulticastAddress)?" (TCP multicast)":" (UDP broadcast)";
System.out.println(s);
while( watcherrunning ) try {
broadcast.receive(packet);
String msg = new String(buf) ;
// clean up the buffer after each message
for (int i=0;i<buf.length;i++) { buf[i]=0; }
InetAddress remotehost = packet.getAddress();
System.out.println("Server Receive Broadcast from "+remotehost.getHostName()+":"+packet.getPort()+" ("+msg.length()+") ["+msg+"]");
if (msg.charAt(0)=='x') {
watcherrunning = false;
System.out.println("I leave");
}
} catch (java.io.InterruptedIOException jii ){
if (!watcherrunning) break;
} catch (java.io.IOException ioe ){
System.err.println("IvyWatcher IOException "+ ioe.getMessage() );
}
broadcast.close();
System.out.println("Server normal shutdown");
}
void stop() { watcherrunning=false; }
private static String getDomain(String net) {
int sep_index = net.lastIndexOf( ":" );
if ( sep_index != -1 ) { net = net.substring(0,sep_index); }
try {
net += ".255.255.255";
RE exp = new RE( "^(\\d+\\.\\d+\\.\\d+\\.\\d+).*");
net = exp.substitute( net , "$1" );
} catch ( REException e ){
System.out.println("Bad broascat addr " + net);
return null;
}
//System.out.println("net: "+net);
return net;
}
private static int getPort(String net) {
int port;
int sep_index = net.lastIndexOf( ":" );
if ( sep_index == -1 ) {
port = -1;
} else {
port = Integer.parseInt( net.substring( sep_index +1 ));
}
//System.out.println("port: "+port);
return port;
}
private static void send(String data, String net) {
int port = getPort(net);
net=getDomain(net);
try {
DatagramSocket send;
InetAddress group = InetAddress.getByName(net);
send = new MulticastSocket(port);
if (group.isMulticastAddress()) { ((MulticastSocket)send).joinGroup(group); }
DatagramPacket packet = new DatagramPacket(
data.getBytes(),
data.length(),
group,
send.getLocalPort() );
System.out.println("Client sends Broadcast to "+net+":"+port+" ("+packet.getLength()+") ["+data+"]");
send.send(packet);
} catch ( UnknownHostException e ) {
System.out.println("Broadcast sent on unknown network "+ e.getMessage());
} catch ( IOException e ) {
System.out.println("Broadcast error " + e.getMessage() );
}
}
void start(String domain) {
String domainaddr=getDomain(domain);
int port=getPort(domain);
this.domain=domainaddr+":"+port;
try {
InetAddress group = InetAddress.getByName(domainaddr);
if (group.isMulticastAddress()) {
isMulticastAddress = true;
broadcast = new MulticastSocket(port ); // create the UDP socket
((MulticastSocket)broadcast).joinGroup(group);
} else {
broadcast = new MulticastSocket(port ); // create the UDP socket
}
} catch ( IOException e ) {
System.out.println("MulticastSocket I/O error" + e );
return;
}
try {
broadcast.setSoTimeout(100);
} catch ( java.net.SocketException jns ) {
System.out.println("IvyWatcher setSoTimeout error" + jns.getMessage() );
}
// starts a Thread listening on the socket
watcherrunning=true;
broadcastListener = new Thread(this);
broadcastListener.start();
}
public static final String helpmsg = "usage: java TestNet [options]\n\t-b BUS\tspecifies the Ivy bus domain\n\t-s\tclient mode (default)\n\t-s\tserver mode\n\t-h\thelp\n\n";
public static void main(String[] args) {
Getopt opt = new Getopt("TestNet",args,"b:csh");
String domain = "228.0.0.0:4567";
boolean server=false;
int c;
while ((c = opt.getopt()) != -1) switch (c) {
case 'b':
domain=opt.getOptarg();
break;
case 'c':
server=false;
break;
case 's':
server=true;
break;
case 'h':
default:
System.out.println(helpmsg);
System.exit(0);
} // getopt
if (server) {
TestNet s = new TestNet();
s.start(domain);
} else {
TestNet.send("coucou1",domain);
TestNet.send("coucou2",domain);
TestNet.send("x",domain);
}
}
} // class TestNet
/* EOF */
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