private void reverseRegister(
RegisterSocketEvent e, int port, InetAddress localHost, boolean error) {
try {
e.setSource(this);
e.setDir(Direction.invert(e.getDir()));
e.port = port;
e.localHost = localHost;
e.error = error;
e.init();
e.go();
} catch (AppiaEventException ex) {
ex.printStackTrace();
}
}
/**
* Handles all received event
*
* @param ev
*/
public void handle(Event ev) {
if (ev instanceof TextEvent
|| ev instanceof DrawEvent
|| ev instanceof ImageEvent
|| ev instanceof ClearWhiteBoardEvent
|| ev instanceof MouseButtonEvent) handleInterestingEvent((GroupSendableEvent) ev);
else {
try {
ev.go();
} catch (AppiaEventException ex) {
ex.printStackTrace();
}
}
}
private void handlePDUSize(MaxPDUSizeEvent e) {
log.debug(":handlePDUSize ");
try {
e.pduSize = param_MAX_UDPMSG_SIZE - MAX_UdpSimple_HEADERS;
e.setDir(Direction.invert(e.getDir()));
e.setSource(this);
e.init();
e.go();
} catch (AppiaEventException ex) {
ex.printStackTrace();
System.err.println("Unexpected exception when forwarding " + "MaxPDUSize event in UDPSimple");
}
}
/**
* Handles all events related to messenger features: TextEvent, DrawEvent, ImageEvent,
* ClearWhiteBoardEvent, MouseButtonEvent
*
* <p>If an event direction is DOWN an hash is generated otherwise received and calculated hashes
* are compared. <br>
* Different hashes mean that an event is ignored
*
* @param ev
*/
private void handleInterestingEvent(GroupSendableEvent ev) {
Message message = ev.getMessage();
byte[] data;
Hash h = new Hash();
// String type;
if (ev.getDir() == Direction.DOWN) {
data = message.toByteArray();
md.update(data);
md.update(secret);
byte[] my = md.digest();
h.setHash(my);
message.pushObject(h);
md.reset();
// out.println("MD calculated");
ev.setObjectsMessage(message);
try {
ev.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
} else {
// incoming hash
h = (Hash) message.popObject();
data = message.toByteArray();
// calculates hash
md.update(data);
md.update(secret);
if (MessageDigest.isEqual(md.digest(), h.getHash())) {
// out.println("Valid");
try {
ev.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
}
// else{
// out.println("Error! Compromised message received!");
// out.println("Message ignored!");
// }
md.reset();
}
}
private void handleMulticastInit(MulticastInitEvent e) {
log.debug(":handleAppiaMulticastInit");
if (!multicastReaders.containsKey(e.ipMulticast)) {
/*creates a multicast socket and binds it to a specific port on the local host machine*/
try {
MulticastSocket multicastSock =
new MulticastSocket(((InetSocketAddress) e.ipMulticast).getPort());
log.debug(":handleAppiaMulticastInit: Socket Multicast created. Address: " + e.ipMulticast);
/*joins a multicast group*/
multicastSock.joinGroup(((InetSocketAddress) e.ipMulticast).getAddress());
// keeping the multicast address...
ipMulticast =
new InetSocketAddress(
((InetSocketAddress) e.ipMulticast).getAddress(),
((InetSocketAddress) e.ipMulticast).getPort());
log.debug(":handleAppiaMulticastInit: Socket Multicast joined.");
try {
multicastSock.setSoTimeout(param_SOTIMEOUT);
} catch (SocketException se) {
System.err.println(
"Unable to set SoTimeout value on UdpSimpleSession. Using default OS value.");
se.printStackTrace();
}
/* The socket is binded. Launch reader and return the event.*/
final UdpSimpleReader multicastReader =
new UdpSimpleReader(this, multicastSock, ipMulticast, e.fullDuplex ? null : myAddress);
final Thread thread =
e.getChannel()
.getThreadFactory()
.newThread(multicastReader, "MulticastReaderThread [" + ipMulticast + "]");
multicastReader.setParentThread(thread);
thread.start();
multicastReaders.put(ipMulticast, multicastReader);
/*forwarding the event*/
e.error = false;
} catch (IOException ex) {
ex.printStackTrace();
System.err.println("Error creating/joining the multicast socket");
e.error = true;
}
} else {
log.debug(":handleAppiaMulticastInit: Requested multicast socket already existed.");
}
try {
e.setDir(Direction.invert(e.getDir()));
e.setSource(this);
e.init();
e.go();
log.debug(":handleAppiaMulticastInit: Returning multicastInit with error code: " + e.error);
log.debug(
":handleAppiaMulticastInit: Direction is "
+ (e.getDir() == Direction.DOWN ? "DOWN" : "UP"));
} catch (AppiaEventException ex) {
ex.printStackTrace();
}
}