public void run() {
while (listen) {
try {
byte[] buf = new byte[256];
byte[] buf2 = new byte[256];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
InetAddress address;
socket.receive(packet);
String in = new String(packet.getData(), 0, packet.getLength());
address = packet.getAddress();
int port = packet.getPort();
// newClient = findPort(port, address, newClient);
String name = findPerson(port, address);
// System.out.println(name);
if (in.startsWith("1")) {
String nama = new String(packet.getData(), 0, packet.getLength());
nama = nama.substring(1);
newClient = new Client(packet.getAddress(), packet.getPort(), nama);
threads.add(newClient);
String wel =
"\nWelcome "
+ newClient.nama
+ "\n "
+ "to quit type \"bye\" and to whisper use prefix @name : ";
buf = (wel).getBytes();
packet = new DatagramPacket(buf, buf.length, packet.getAddress(), packet.getPort());
socket.send(packet);
wel = " enters the room";
buf = (newClient.nama + wel).getBytes();
Broadcast(address, port, buf);
} else if (in.startsWith("@")) {
// findPort(port, address, newClient);
Whisper(newClient, packet.getData());
} else if (in.equals("bye")) {
String bye = name + " is leaving";
buf2 = bye.getBytes();
// packet = new DatagramPacket(buf,buf.length,newClient.address, newClient.port);
Broadcast(address, port, buf2);
} else {
byte[] buf3 = new byte[256];
String text =
name + "<broadcast> : " + new String(packet.getData(), 0, packet.getLength());
buf3 = text.getBytes();
Broadcast(packet.getAddress(), packet.getPort(), buf3);
}
} catch (IOException ex) {
Logger.getLogger(DatagramServer.class.getName()).log(Level.SEVERE, null, ex);
}
}
socket.close();
}
private void listen() throws Exception {
System.out.println("Listening on port: " + serverPort);
// Initialize socket
socket = new DatagramSocket(serverPort);
// While running
while (run) {
// Wait for handshake
packet = new DatagramPacket(response, response.length);
socket.receive(packet); // Blocking
// System.out.println("RT: got packet");
Packet p = new Packet(packet.getData());
if (p.isHandshake()) {
// System.out.println("RT: is handshake");
// Get client connection info
InetAddress IPAddress = packet.getAddress();
int port = packet.getPort();
// Process handshake
processHandshake(p, IPAddress, port);
// Get message
MyMessage message = getMessage();
if (message != null) {
rc.rreceive(message);
}
}
}
}
public static void main(String args[]) {
DatagramSocket skt = null;
try {
skt = new DatagramSocket(6789);
byte[] buffer = new byte[1000];
while (true) {
DatagramPacket request = new DatagramPacket(buffer, buffer.length);
skt.receive(request);
System.out.println("Data received from client");
System.out.println(new String(request.getData()));
Thread.sleep(15000);
String[] arrayMsg = (new String(request.getData())).split(" ");
System.out.println(arrayMsg[0] + "server processed");
byte[] sendMsg = (arrayMsg[0] + "server processed").getBytes();
DatagramPacket reply =
new DatagramPacket(sendMsg, sendMsg.length, request.getAddress(), request.getPort());
System.out.println("sending data from server to client");
Thread.sleep(15000);
;
skt.send(reply);
}
} catch (Exception e) {
}
}
/**
* Copies the properties of a specific <tt>DatagramPacket</tt> to another <tt>DatagramPacket</tt>.
* The property values are not cloned.
*
* @param src the <tt>DatagramPacket</tt> which is to have its properties copied to <tt>dest</tt>
* @param dest the <tt>DatagramPacket</tt> which is to have its properties set to the value of the
* respective properties of <tt>src</tt>
*/
public static void copy(DatagramPacket src, DatagramPacket dest) {
synchronized (dest) {
dest.setAddress(src.getAddress());
dest.setPort(src.getPort());
byte[] srcData = src.getData();
if (srcData == null) dest.setLength(0);
else {
byte[] destData = dest.getData();
if (destData == null) dest.setLength(0);
else {
int destOffset = dest.getOffset();
int destLength = destData.length - destOffset;
int srcLength = src.getLength();
if (destLength >= srcLength) destLength = srcLength;
else if (logger.isLoggable(Level.WARNING)) {
logger.log(Level.WARNING, "Truncating received DatagramPacket data!");
}
System.arraycopy(srcData, src.getOffset(), destData, destOffset, destLength);
dest.setLength(destLength);
}
}
}
}
/**
* Initializes a new <tt>DatagramPacket</tt> instance which is a clone of a specific
* <tt>DatagramPacket</tt> i.e. the properties of the clone <tt>DatagramPacket</tt> are clones of
* the specified <tt>DatagramPacket</tt>.
*
* @param p the <tt>DatagramPacket</tt> to clone
* @return a new <tt>DatagramPacket</tt> instance which is a clone of the specified
* <tt>DatagramPacket</tt>
*/
public static DatagramPacket clone(DatagramPacket p) {
synchronized (p) {
byte[] pData = p.getData();
byte[] cData = (pData == null) ? null : pData.clone();
return new DatagramPacket(cData, p.getOffset(), p.getLength(), p.getAddress(), p.getPort());
}
}
private boolean sendAck(Packet p, DatagramPacket dp) {
// Respond
// System.out.println("RT: Sending ack for packet w/ seqnum: " + p.getSeqNum());
Packet hsp = new Packet(p.getSeqNum());
hsp.assembleHandshakePacket();
packet =
new DatagramPacket(hsp.getPacketData(), hsp.getPacketSize(), dp.getAddress(), dp.getPort());
try {
socket.send(packet);
} catch (Exception e) {
System.out.println("RT: Could not send ack packet:\n" + e.getMessage());
return false;
}
return true;
}
public void run() {
try {
byte[] in_data = new byte[pkt_size];
DatagramPacket in_pkt = new DatagramPacket(in_data, in_data.length);
try {
while (true) {
sk_in.receive(in_pkt);
System.out.print(
(new Date().getTime())
+ ": sender received "
+ in_pkt.getLength()
+ "bytes from "
+ in_pkt.getAddress().toString()
+ ":"
+ in_pkt.getPort()
+ ". data are ");
for (int i = 0; i < pkt_size; ++i) System.out.print(in_data[i]);
System.out.println();
try {
String res = new String(in_data);
String[] arr = new String[2];
arr = res.split(" ");
System.out.println(arr[0]);
System.out.println(arr[1]);
if ((arr[0].trim().equalsIgnoreCase(String.valueOf(curr)))
&& (arr[1].trim().equalsIgnoreCase("ACK")
&& (arr[2].trim().equalsIgnoreCase(String.valueOf(617709412))))) {
curr++;
}
} catch (Exception e) {
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
sk_in.close();
}
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
}
public void run() {
DatagramPacket packet;
byte receive_buf[] = new byte[65535];
int len;
byte[] tmp, data;
// moved out of loop to avoid excessive object creations (bela March 8 2001)
packet = new DatagramPacket(receive_buf, receive_buf.length);
while (mcast_receiver != null && mcast_sock != null) {
try {
packet.setData(receive_buf, 0, receive_buf.length);
mcast_sock.receive(packet);
len = packet.getLength();
data = packet.getData();
if (len == 1 && data[0] == 0) {
if (Trace.debug) {
Trace.info("UDP.run()", "received dummy packet");
}
continue;
}
if (len == 4) { // received a diagnostics probe
if (data[0] == 'd' && data[1] == 'i' && data[2] == 'a' && data[3] == 'g') {
handleDiagnosticProbe(packet.getAddress(), packet.getPort());
continue;
}
}
if (Trace.debug) {
Trace.info(
"UDP.receive()",
"received (mcast) "
+ packet.getLength()
+ " bytes from "
+ packet.getAddress()
+ ":"
+ packet.getPort()
+ " (size="
+ len
+ " bytes)");
}
if (len > receive_buf.length) {
Trace.error(
"UDP.run()",
"size of the received packet ("
+ len
+ ") is bigger than "
+ "allocated buffer ("
+ receive_buf.length
+ "): will not be able to handle packet. "
+ "Use the FRAG protocol and make its frag_size lower than "
+ receive_buf.length);
}
if (Version.compareTo(data) == false) {
Trace.warn(
"UDP.run()",
"packet from "
+ packet.getAddress()
+ ":"
+ packet.getPort()
+ " has different version ("
+ Version.printVersionId(data, Version.version_id.length)
+ ") from ours ("
+ Version.printVersionId(Version.version_id)
+ "). This may cause problems");
}
if (use_incoming_packet_handler) {
tmp = new byte[len];
System.arraycopy(data, 0, tmp, 0, len);
incoming_queue.add(tmp);
} else {
handleIncomingUdpPacket(data);
}
} catch (SocketException sock_ex) {
if (Trace.trace) {
Trace.info("UDP.run()", "multicast socket is closed, exception=" + sock_ex);
}
break;
} catch (InterruptedIOException io_ex) { // thread was interrupted
; // go back to top of loop, where we will terminate loop
} catch (Throwable ex) {
Trace.error("UDP.run()", "exception=" + ex + ", stack trace=" + Util.printStackTrace(ex));
Util.sleep(300); // so we don't get into 100% cpu spinning (should NEVER happen !)
}
}
if (Trace.trace) {
Trace.info("UDP.run()", "multicast thread terminated");
}
}
private void setSendPacketAddress(DatagramPacket sendPacket, DatagramPacket receivePacket) {
// Tell the client to send more data
sendPacket.setAddress(receivePacket.getAddress());
sendPacket.setPort(receivePacket.getPort());
}
@Override
public void run() {
try {
// Create a packet for sending data
DatagramPacket sendPacket = new DatagramPacket(buffer, buffer.length);
OutputStream outputStream = null;
String fileName = "";
boolean createFile = true;
int bytesReceived = 0;
long totalBytesReceived = 0;
long fileSize = 0;
socket.receive(receivePacket);
// Display the client number
textArea.append("Starting thread for UDP client " + clientNo + " at " + new Date() + '\n');
textArea.append(
"The client host name is "
+ receivePacket.getAddress().getHostName()
+ " and port number is "
+ receivePacket.getPort()
+ '\n');
// Continuously serve the client
while (true) {
bytesReceived = receivePacket.getLength();
if (bytesReceived
> 0) { // Get the file transmission header from the initial client packet
String transmitHeader = new String(receivePacket.getData(), 0, bytesReceived);
// transmitHeader = transmitHeader.substring(0, bytesReceived).trim().;
String[] header = transmitHeader.split(HEADER_DEL);
fileSize = Long.parseLong(header[0]);
fileName = header[1];
// Send receipt acknowledgment back to the client. Just send back the number of bytes
// received.
setSendPacketAddress(sendPacket, receivePacket);
sendPacket.setData(String.valueOf(bytesReceived).getBytes());
socket.send(sendPacket);
}
while (totalBytesReceived < fileSize) {
// Wait for client to send bytes
// socket.setSendBufferSize(BUFFER_SIZE);
socket.receive(receivePacket);
bytesReceived = receivePacket.getLength();
if (totalBytesReceived == 0) {
if (createFile) { // Get a unique name for the file to be received
// fileName = getUniqueFileName();
fileName = textFolder.getText() + fileName;
outputStream = createFile(fileName);
createFile = false;
textArea.append("Receiving file from client.\n");
}
// Write bytes to file
outputStream.write(receivePacket.getData(), 0, bytesReceived);
} else {
if (outputStream != null) { // Write bytes to file, if any
outputStream.write(receivePacket.getData(), 0, bytesReceived);
}
}
// Increment total bytes received
totalBytesReceived += bytesReceived;
// Tell the client to send more data. Just send back the number of bytes received.
sendPacket.setData(String.valueOf(bytesReceived).getBytes());
socket.send(sendPacket);
// buffer = new byte[BUFFER_SIZE];
Arrays.fill(buffer, (byte) 0);
receivePacket = new DatagramPacket(buffer, buffer.length);
}
outputStream.flush();
outputStream.close();
textArea.append("Received file successfully. Saved as " + fileName + "\n");
// Tell the client transmission is complete. Just send back the total number of bytes
// received.
sendPacket.setData(String.valueOf(totalBytesReceived).getBytes());
socket.send(sendPacket);
// Reset creation flag
createFile = true;
totalBytesReceived = 0;
// Wait for client to send another file
socket.receive(receivePacket);
}
} catch (IOException e) {
System.err.println(e);
}
}
public void runSupport() {
byte[] input_buffer = new byte[request_dg.getLength()];
System.arraycopy(request_dg.getData(), 0, input_buffer, 0, input_buffer.length);
int packet_data_length = input_buffer.length;
String auth_user = null;
byte[] auth_user_bytes = null;
byte[] auth_hash = null;
if (server.isTrackerPasswordEnabled()) {
// auth detail should be attached to the packet. Auth details are 16
// bytes
if (input_buffer.length < 17) {
Logger.log(
new LogEvent(
LOGID,
LogEvent.LT_WARNING,
"TRTrackerServerProcessorUDP: " + "packet received but authorisation missing"));
return;
}
packet_data_length -= 16;
auth_user_bytes = new byte[8];
auth_hash = new byte[8];
System.arraycopy(input_buffer, packet_data_length, auth_user_bytes, 0, 8);
int user_len = 0;
while (user_len < 8 && auth_user_bytes[user_len] != 0) {
user_len++;
}
auth_user = new String(auth_user_bytes, 0, user_len);
System.arraycopy(input_buffer, packet_data_length + 8, auth_hash, 0, 8);
}
DataInputStream is =
new DataInputStream(new ByteArrayInputStream(input_buffer, 0, packet_data_length));
try {
String client_ip_address = request_dg.getAddress().getHostAddress();
PRUDPPacketRequest request = PRUDPPacketRequest.deserialiseRequest(null, is);
Logger.log(
new LogEvent(
LOGID, "TRTrackerServerProcessorUDP: packet received: " + request.getString()));
PRUDPPacket reply = null;
TRTrackerServerTorrentImpl torrent = null;
if (auth_user_bytes != null) {
// user name is irrelevant as we only have one at the moment
// <parg_home> so <new_packet> = <old_packet> + <user_padded_to_8_bytes> + <hash>
// <parg_home> where <hash> = first 8 bytes of sha1(<old_packet> + <user_padded_to_8> +
// sha1(pass))
// <XTF> Yes
byte[] sha1_pw = null;
if (server.hasExternalAuthorisation()) {
try {
URL resource = new URL("udp://" + server.getHost() + ":" + server.getPort() + "/");
sha1_pw = server.performExternalAuthorisation(resource, auth_user);
} catch (MalformedURLException e) {
Debug.printStackTrace(e);
}
if (sha1_pw == null) {
Logger.log(
new LogEvent(
LOGID,
LogEvent.LT_ERROR,
"TRTrackerServerProcessorUDP: auth fails for user '" + auth_user + "'"));
reply = new PRUDPPacketReplyError(request.getTransactionId(), "Access Denied");
}
} else {
sha1_pw = server.getPassword();
}
// if we haven't already failed then check the PW
if (reply == null) {
SHA1Hasher hasher = new SHA1Hasher();
hasher.update(input_buffer, 0, packet_data_length);
hasher.update(auth_user_bytes);
hasher.update(sha1_pw);
byte[] digest = hasher.getDigest();
for (int i = 0; i < auth_hash.length; i++) {
if (auth_hash[i] != digest[i]) {
Logger.log(
new LogEvent(
LOGID,
LogEvent.LT_ERROR,
"TRTrackerServerProcessorUDP: auth fails for user '" + auth_user + "'"));
reply = new PRUDPPacketReplyError(request.getTransactionId(), "Access Denied");
break;
}
}
}
}
int request_type = TRTrackerServerRequest.RT_UNKNOWN;
if (reply == null) {
if (server.isEnabled()) {
try {
int type = request.getAction();
if (type == PRUDPPacketTracker.ACT_REQUEST_CONNECT) {
reply = handleConnect(client_ip_address, request);
} else if (type == PRUDPPacketTracker.ACT_REQUEST_ANNOUNCE) {
Object[] x =
handleAnnounceAndScrape(
client_ip_address, request, TRTrackerServerRequest.RT_ANNOUNCE);
if (x == null) {
throw (new Exception("Connection ID mismatch"));
}
reply = (PRUDPPacket) x[0];
torrent = (TRTrackerServerTorrentImpl) x[1];
request_type = TRTrackerServerRequest.RT_ANNOUNCE;
} else if (type == PRUDPPacketTracker.ACT_REQUEST_SCRAPE) {
Object[] x =
handleAnnounceAndScrape(
client_ip_address, request, TRTrackerServerRequest.RT_SCRAPE);
if (x == null) {
throw (new Exception("Connection ID mismatch"));
}
reply = (PRUDPPacket) x[0];
torrent = (TRTrackerServerTorrentImpl) x[1];
request_type = TRTrackerServerRequest.RT_SCRAPE;
} else {
reply = new PRUDPPacketReplyError(request.getTransactionId(), "unsupported action");
}
} catch (Throwable e) {
// e.printStackTrace();
String error = e.getMessage();
if (error == null) {
error = e.toString();
}
reply = new PRUDPPacketReplyError(request.getTransactionId(), error);
}
} else {
System.out.println("UDP Tracker: replying 'disabled' to " + client_ip_address);
reply = new PRUDPPacketReplyError(request.getTransactionId(), "UDP Tracker disabled");
}
}
if (reply != null) {
InetAddress address = request_dg.getAddress();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream os = new DataOutputStream(baos);
reply.serialise(os);
byte[] output_buffer = baos.toByteArray();
DatagramPacket reply_packet =
new DatagramPacket(output_buffer, output_buffer.length, address, request_dg.getPort());
socket.send(reply_packet);
server.updateStats(request_type, torrent, input_buffer.length, output_buffer.length);
}
} catch (Throwable e) {
Logger.log(new LogEvent(LOGID, "TRTrackerServerProcessorUDP: processing fails", e));
} finally {
try {
is.close();
} catch (Throwable e) {
}
}
}
public static void default_fn() throws IOException {
// Declaring Socket for sending and receiving data
DatagramSocket skt = null;
// declaring the fields to be used
String client_name, movie_name, time, cost, password, reply_string;
int i, j;
// assigning the socket a port number
skt = new DatagramSocket(6789);
// defining the buffer and its size
byte[] buffer = new byte[1000];
while (true) {
// defining the packet to be received from client
DatagramPacket request = new DatagramPacket(buffer, buffer.length);
// receiving the packet
skt.receive(request);
// comment on the console
System.out.println("Data received from client");
// Thread.sleep(5000);//for error check
// converting the message to string and then splitting it into fields divided by newline
// character
String[] arrayMsg = (new String(request.getData())).split("\n");
client_name = arrayMsg[1];
movie_name = arrayMsg[2];
time = arrayMsg[3];
cost = "$12";
password = "******";
// Composing the reply message by appending start time,cost and password
reply_string = client_name + "\n" + movie_name + "\n" + time + "\n" + cost + "\n" + password;
System.out.println(reply_string);
// Thread.sleep(5000); for error check
// converting string message to byte
byte[] sendMsg = (reply_string).getBytes();
// composing the data packet and sending it to the client's address and the same port the
// client used
DatagramPacket reply =
new DatagramPacket(sendMsg, sendMsg.length, request.getAddress(), request.getPort());
System.out.println("sending confirmation");
// Thread.sleep(5000);//for error check
// writing server log file
PrintWriter writer = new PrintWriter("server_log.txt", "UTF-8");
writer.println(client_name);
writer.println(movie_name);
writer.println(time);
writer.close();
// sending the data packet
skt.send(reply);
// Closing the server socket
skt.close();
}
}
public void run() {
System.out.println("Server is running!");
try {
socket = new DatagramSocket(PORT);
} catch (SocketException se) {
System.err.println("Couldn't open socket on port " + PORT);
}
System.out.println("Datagram server listening on port " + PORT);
boolean isRunning = true;
while (isRunning) {
try {
// receive request
byte[] bufReceive = new byte[1024];
DatagramPacket packet = new DatagramPacket(bufReceive, bufReceive.length);
socket.receive(packet);
String receiveMessage = new String(packet.getData(), 0, packet.getLength());
System.out.println("Server received: " + receiveMessage);
// send the response to the client
Scanner myScanner = new Scanner(receiveMessage);
myScanner.next();
MyEvent.incoming = receiveMessage;
MyEvent.incomingIntx = myScanner.nextInt();
myScanner.close();
MyEvent.received();
try {
Thread.sleep(10000);
} catch (Exception e) {
}
// MyEvent.stopIt();
/// send to someone else
int port = packet.getPort();
InetAddress address = packet.getAddress();
String respondMessage =
"Hello "
+ receiveMessage
+ " at "
+ address
+ ", I received your message on port "
+ port;
byte[] bufSend = respondMessage.getBytes();
packet = new DatagramPacket(bufSend, bufSend.length, address, port);
socket.send(packet);
} catch (IOException ioe) {
System.err.println("Error! There was a problem in the server!");
ioe.printStackTrace();
isRunning = false;
}
}
socket.close();
}
