public static void main(String[] args) throws IOException, InterruptedException {
boolean running = true;
// udp protocol over a socket.
DatagramSocket socket = new DatagramSocket();
while (running) {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String line = br.readLine();
String[] inputs = line.split(" ");
if (inputs.length < 2) {
System.out.println("Usage: username command id");
socket.close();
return;
}
byte[] byteArr = (inputs[0] + " " + inputs[1] + " " + inputs[2]).getBytes();
// send request
byte[] buf = new byte[256];
InetAddress address = InetAddress.getByName("localhost");
DatagramPacket packet = new DatagramPacket(byteArr, byteArr.length, address, 4445);
socket.send(packet);
// get response
packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
// display response
String received = new String(packet.getData(), 0, packet.getLength());
System.out.println("From server: " + received);
}
// socket.close();
}
public static void main(final String... args) throws Throwable {
final String remotehost = args[0];
final int remoteport = Integer.parseInt(args[1]);
final DatagramSocket socket = new DatagramSocket();
final byte buffer[] = new byte[512];
final InetSocketAddress remote = new InetSocketAddress(remotehost, remoteport);
buffer[0] = ENQUIRY;
buffer[1] = END_OF_TRANSMISSION;
socket.send(new DatagramPacket(buffer, 2, remote));
final DatagramPacket p = new DatagramPacket(buffer, buffer.length);
socket.receive(p);
if ((p.getLength() == 2) && (buffer[0] == ACKNOWLEDGE) && (buffer[1] == END_OF_TRANSMISSION))
System.out.println("Connection established");
else {
System.out.println("Connection failed");
return;
}
for (; ; ) {
int ptr = 0;
for (int d; (d = System.in.read()) != '\n'; ) buffer[ptr++] = (byte) d;
socket.send(new DatagramPacket(buffer, ptr, remote));
}
}
/*
* Connect a UDP socket, disconnect it, then send and recv on it.
* It will fail on Linux if we don't silently bind(2) again at the
* end of DatagramSocket.disconnect().
*/
private static void testConnectedUDP(InetAddress addr) throws Exception {
try {
DatagramSocket s = new DatagramSocket(0, addr);
DatagramSocket ss = new DatagramSocket(0, addr);
System.out.print("\tconnect...");
s.connect(ss.getLocalAddress(), ss.getLocalPort());
System.out.print("disconnect...");
s.disconnect();
byte[] data = {0, 1, 2};
DatagramPacket p =
new DatagramPacket(data, data.length, s.getLocalAddress(), s.getLocalPort());
s.setSoTimeout(10000);
System.out.print("send...");
s.send(p);
System.out.print("recv...");
s.receive(p);
System.out.println("OK");
ss.close();
s.close();
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}
/**
* Workaround for the problem encountered in certains JDKs that a thread listening on a socket
* cannot be interrupted. Therefore we just send a dummy datagram packet so that the thread 'wakes
* up' and realizes it has to terminate. Should be removed when all JDKs support
* Thread.interrupt() on reads. Uses sock t send dummy packet, so this socket has to be still
* alive.
*
* @param dest The destination host. Will be local host if null
* @param port The destination port
*/
void sendDummyPacket(InetAddress dest, int port) {
DatagramPacket packet;
byte[] buf = {0};
if (dest == null) {
try {
dest = InetAddress.getLocalHost();
} catch (Exception e) {
}
}
if (Trace.debug) {
Trace.info("UDP.sendDummyPacket()", "sending packet to " + dest + ":" + port);
}
if (sock == null || dest == null) {
Trace.warn(
"UDP.sendDummyPacket()", "sock was null or dest was null, cannot send dummy packet");
return;
}
packet = new DatagramPacket(buf, buf.length, dest, port);
try {
sock.send(packet);
} catch (Throwable e) {
Trace.error(
"UDP.sendDummyPacket()",
"exception sending dummy packet to " + dest + ":" + port + ": " + e);
}
}
void doSend(byte[] data, InetAddress dest, int port) throws IOException {
DatagramPacket packet;
packet = new DatagramPacket(data, data.length, dest, port);
if (sock != null) {
sock.send(packet);
}
}
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) {
}
}
public static void Whisper(Client newClient, byte[] buf) {
String input = new String(buf, 0, buf.length);
input = input.substring(1);
byte[] sendbuff = new byte[256];
String[] parts = null;
String text = null;
String whisperTo = null;
try {
parts = input.split(" : ");
whisperTo = parts[0]; // 004
// System.out.println(newClient.nama+" "+whisperTo);
text = parts[1];
} catch (ArrayIndexOutOfBoundsException e) {
String notif = "wrong prefix";
sendbuff = notif.getBytes();
DatagramPacket packet =
new DatagramPacket(sendbuff, sendbuff.length, newClient.address, newClient.port);
}
String prefix = newClient.nama + " : " + text;
sendbuff = prefix.getBytes();
for (Client h : threads) {
if (h.nama.equals(whisperTo)) {
DatagramPacket packet = new DatagramPacket(sendbuff, sendbuff.length, h.address, h.port);
try {
socket.send(packet);
} catch (IOException ex) {
Logger.getLogger(DatagramServer.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
public static void main(String args[]) throws Exception {
// Making a text file
String filename =
"C:\\Users\\S.S. Mehta\\Desktop\\Codes\\ComputerNetworks\\CN_project\\CN_project\\test3.txt";
makeTextFile(filename);
// Reading the file and puttin it in buffer
BufferedReader in = new BufferedReader(new FileReader(filename));
char[] c1 = new char[PACKET_SIZE];
c1 = readData(in);
displayPacket(c1);
// Step3 - making a socket , makeing a packet with inet address and sending it
byte[] buffer = new byte[PACKET_SIZE];
DatagramSocket skt = new DatagramSocket(PORT_NUMBER);
DatagramPacket request = new DatagramPacket(buffer, buffer.length);
// stop till you receive
wait(skt, request);
System.out.println("On server side \nrequest received from Slient");
// making a packet with an inet address -
InetAddress host = InetAddress.getByName("localhost");
DatagramPacket reply = makePacket(c1, host);
// Sending reply packet
System.out.println("Sending reply packet to client");
Thread.sleep(5000);
skt.send(reply);
// closing the socket
skt.close();
}
public static void main(String[] args) {
int port = 5555;
DatagramSocket socket;
socket = null;
try {
socket = new DatagramSocket(port);
socket.setBroadcast(true);
socket.connect(InetAddress.getByName("255.255.255.255"), 5555);
} catch (Exception e) {
System.err.println("Connection failed. " + e.getMessage());
}
while (true) {
String message = "hey";
byte[] buf = message.getBytes();
DatagramPacket packet = new DatagramPacket(buf, buf.length);
try {
socket.send(packet);
} catch (Exception e) {
System.err.println("Sending failed. " + e.getMessage());
}
}
}
/**
* Schedule a timer for retransmission.
*
* @throws Exception if message cannot be sent on the socket
*/
public void schedule() throws Exception {
sock.send(message);
/* choose a random between [-1, 1] */
int rand = new Random().nextInt(2) - 1;
timer.schedule(new RetransmissionHandler(), (interval + rand) * 1000);
}
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();
}
void handleDiagnosticProbe(InetAddress sender, int port) {
try {
byte[] diag_rsp = getDiagResponse().getBytes();
DatagramPacket rsp = new DatagramPacket(diag_rsp, 0, diag_rsp.length, sender, port);
if (Trace.trace) {
Trace.info(
"UDP.handleDiagnosticProbe()", "sending diag response to " + sender + ":" + port);
}
sock.send(rsp);
} catch (Throwable t) {
Trace.error(
"UDP.handleDiagnosticProbe()",
"failed sending diag rsp to " + sender + ":" + port + ", exception=" + t);
}
}
protected void sendBeacon() {
if (is_enabled) {
try {
byte[] bytes = encodeBeacon(true, tcp_port);
control_socket.send(
new DatagramPacket(
bytes, bytes.length, InetAddress.getByName("255.255.255.255"), CONTROL_PORT));
} catch (Throwable e) {
log("Failed to send beacon", e);
}
}
}
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 static void Broadcast(InetAddress address, int port, byte[] buf) {
// System.out.println(port + " " + findPerson(port,address) );
for (Client h : threads) {
// System.out.println(h.port + " "+h.nama);
// System.out.println(threads.size());
if (h.port != port) {
// && !address.equals(h.address)
DatagramPacket packet = new DatagramPacket(buf, buf.length, h.address, h.port);
try {
socket.send(packet);
// System.out.println("yang di broadcast " +h.port + " "+h.nama);
// System.out.println(new String(packet.getData(),0,packet.getLength()));
} catch (IOException ex) {
Logger.getLogger(DatagramServer.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
private int processHandshake(Packet p, InetAddress ip, int port) throws Exception {
// System.out.println("Got handshake");
// Get connection information
this.numMessages = p.getNumMessages();
this.totalDataSize = p.getTotalDataLength();
this.seqNum = p.getSeqNum();
// Respond
// System.out.println("RT: Sending handshake response");
Packet hsp = new Packet(seqNum);
hsp.assembleHandshakePacket();
packet = new DatagramPacket(hsp.getPacketData(), hsp.getPacketSize(), ip, port);
socket.send(packet);
// System.out.println("RT: Done with handshake:\n\tStarting seqnum: "+seqNum+"\n\tTotal datalen:
// "+totalDataSize);
return 1; // FIXME p.getNumMessages();
}
// ------------------------
// Handler for timer
// ------------------------
public void actionPerformed(ActionEvent e) {
// if the current image nb is less than the length of the video
if (imagenb < VIDEO_LENGTH) {
// update current imagenb
imagenb++;
try {
// get next frame to send from the video, as well as its size
int image_length = video.getnextframe(buf);
// Builds an RTPpacket object containing the frame
RTPpacket rtp_packet =
new RTPpacket(MJPEG_TYPE, imagenb, imagenb * FRAME_PERIOD, buf, image_length);
// get to total length of the full rtp packet to send
int packet_length = rtp_packet.getlength();
// retrieve the packet bitstream and store it in an array of bytes
byte[] packet_bits = new byte[packet_length];
rtp_packet.getpacket(packet_bits);
// send the packet as a DatagramPacket over the UDP socket
senddp = new DatagramPacket(packet_bits, packet_length, ClientIPAddr, RTP_dest_port);
RTPsocket.send(senddp);
// System.out.println("Send frame #"+imagenb);
// print the header bitstream
rtp_packet.printheader();
// update GUI
label.setText("Send frame #" + imagenb);
} catch (Exception ex) {
System.out.println("Exception caught: " + ex);
System.exit(0);
}
} else {
// if we have reached the end of the video file, stop the timer
timer.stop();
}
}
public static void main(String args[]) throws Exception {
DatagramSocket r_clients = null, s_clients = null;
MulticastSocket servers = null, b_clients = null;
local = Integer.parseInt(args[1]);
rec = Integer.parseInt(args[0]);
System.out.println("Recieving arp on port " + rec + "...");
System.out.println("Recieving reply arp on port " + (rec + 1) + "...");
System.out.println("\nEmulating gateway on port " + local + "\nWaiting...");
try {
r_clients = new DatagramSocket(rec);
s_clients = new DatagramSocket(rec + 1);
b_clients = new MulticastSocket(local);
b_clients.joinGroup(InetAddress.getByName(group));
servers = new MulticastSocket(serv_port);
servers.joinGroup(InetAddress.getByName(group));
servers.setSoTimeout(10);
s_clients.setSoTimeout(10);
b_clients.setSoTimeout(10);
r_clients.setSoTimeout(10);
} catch (Exception e) {
System.out.println("error: " + e.toString());
System.exit(1);
}
byte arp_buf[] = new byte[28];
DatagramPacket arp_packet = new DatagramPacket(arp_buf, arp_buf.length);
while (true) {
try {
servers.receive(arp_packet);
System.out.println("\nGot arp from servers");
System.out.println("Sending arp to local computers");
arp_packet.setAddress(InetAddress.getByName(group));
arp_packet.setPort(local);
try {
b_clients.send(arp_packet, (byte) 255);
} catch (Exception e3) {
}
} catch (Exception e) {
try {
r_clients.receive(arp_packet);
System.out.println("\nGot arp from client");
System.out.println("Sending ARP");
arp_packet.setAddress(InetAddress.getByName(group));
arp_packet.setPort(serv_port);
try {
servers.send(arp_packet, (byte) 255);
} catch (Exception e3) {
}
} catch (Exception e2) {
try {
s_clients.receive(arp_packet);
System.out.println("\nGot reply arp from client");
arp_packet.setAddress(InetAddress.getByName(group));
arp_packet.setPort(2500);
try {
s_clients.send(arp_packet);
} catch (Exception e3) {
}
} catch (Exception e4) {
}
}
}
}
}
/** Method to keep the connection alive with the name server */
public void run() {
boolean connected = false;
int ticket = 0;
int serial = -1;
int time = 1000;
DatagramPacket inPack = new DatagramPacket(new byte[1024], 1024);
DatagramPacket outPack = new DatagramPacket(new byte[1024], 1024);
ByteArrayOutputStream outBuf = new ByteArrayOutputStream();
DataInputStream inData;
DataOutputStream outData = new DataOutputStream(outBuf);
while (running) {
if (!connected) { // Thoust ought Register thine self
try {
outBuf.reset();
outData.writeByte(0);
outData.writeUTF(userName);
outData.writeInt(portNum);
outData.flush();
outPack.setData(outBuf.toByteArray());
nameServer.send(outPack);
} catch (IOException e) {
System.err.println("LeetActive: " + e);
}
} else { // Thoust ought Renew thine self
try {
outBuf.reset();
outData.writeByte(2);
outData.writeInt(ticket);
outData.flush();
outPack.setData(outBuf.toByteArray());
nameServer.send(outPack);
} catch (IOException e) {
System.err.println(e);
}
}
// Now we will receive a packet...
try {
nameServer.receive(inPack);
inData = new DataInputStream(new ByteArrayInputStream(inPack.getData()));
byte type = inData.readByte();
if (type == 1) { // Twas a ticket packet
try {
ticket = inData.readInt();
if (ticket > -1) { // Make sure its not evil
connected = true;
} else {
connected = false;
}
time = inData.readInt();
} catch (IOException e) {
System.err.println(e);
}
}
if (type == 5) { // Twas an update packet
try {
int s = inData.readInt();
if (s > serial) { // Make sure its not old
serial = s;
int size = inData.readInt();
ArrayList newList = new ArrayList(size);
for (int x = 0; x < size; x++) {
newList.add(
new String(
"" + inData.readUTF() + "@" + inData.readUTF() + ":" + inData.readInt()));
}
if (!newList.equals(hostList)) {
hostList = newList;
updated = true;
}
}
} catch (IOException e) {
System.err.println(e);
}
}
} catch (SocketTimeoutException e) { // Server hates you
connected = false;
System.err.println(e);
} catch (IOException e) {
System.err.println(e);
}
try { // Take a nap
sleep(time / 4);
} catch (InterruptedException 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 static void main(String args[]) throws InterruptedException, IOException {
int i, j;
String serverInetAddress = "localhost";
String server1AddressString = "10.10.1.1";
InetAddress server1Address = InetAddress.getByName(server1AddressString);
String server2AddressString = "10.10.2.2";
InetAddress server2Address = InetAddress.getByName(server2AddressString);
String server3AddressString = "10.10.3.2";
InetAddress server3Address = InetAddress.getByName(server3AddressString);
String server4AddressString = "localhost";
InetAddress server4Address = InetAddress.getByName(server4AddressString);
DatagramSocket skt;
{
skt = new DatagramSocket(PORT_NUMBER_CLIENT); // socket used to listen and write
InetAddress host = InetAddress.getByName(serverInetAddress);
int serversocket = S1.PORT_NUMBER_SERVER;
String msg = "Send file size";
byte[] b = msg.getBytes();
// dummy assignments - not used anywhere
int filesize = 1;
DatagramPacket reply, request;
reply = new DatagramPacket(b, b.length, host, serversocket);
request = new DatagramPacket(b, b.length, host, serversocket);
for (i = 1; i <= 3; i++) {
// defining a packet called request with parameters b(msg in bytes), b.length, host Internet
// address and socket number
if (i == 1) {
host = server1Address;
} else if (i == 2) {
host = server2Address;
} else if (i == 3) {
host = server3Address;
}
request = new DatagramPacket(b, b.length, host, serversocket);
// System.out.println("request sent from client to server");
Thread.sleep(S1.PAUSE_DURATION); // for error checks
// Sending the packet- for getting the file size
skt.send(request);
// getting reply from
// server........................................................................................
byte[] buffer =
new byte
[S1.PACKET_SIZE]; // apparently the size of data packet at the receiving side needs
// to be bigger than the size of incoming datapacket
reply = new DatagramPacket(buffer, buffer.length);
// receiving packet from server - contatining filesize
skt.receive(reply);
// System.out.println("Response Received from server");
// System.out.println("on Client: - filesize= "+new String(reply.getData()));
filesize = Integer.parseInt(new String(reply.getData()).trim());
// System.out.println("on Client: - filesize= "+filesize);
Thread.sleep(S1.PAUSE_DURATION);
}
// here the client know the size of the file
// Find the number of times it must make iterations - dividing filesize by packet_size
// Request that many packets from server
String[] buffer_string = new String[BUFFER_SIZE_CLIENT];
float delay[] = new float[filesize / S1.PACKET_SIZE];
System.out.println(filesize);
System.out.println(S1.PACKET_SIZE);
System.out.println(filesize / S1.PACKET_SIZE);
Thread.sleep(2000);
byte[] buffer = new byte[S1.PACKET_SIZE];
for (i = 0; i < filesize / S1.PACKET_SIZE; i++) {
if (i % 100 != 0) {
// System.out.print(" "+i);
} else {
System.out.println(" " + i);
}
msg = String.valueOf(i);
b = msg.getBytes();
if (i % 3 == 0) {
host = server1Address;
} else if (i % 3 == 1) {
host = server2Address;
} else if (i % 3 == 2) {
host = server3Address;
}
request = new DatagramPacket(b, b.length, host, serversocket);
skt.send(request);
delay[i] = System.nanoTime();
Thread.sleep(10);
skt.receive(reply);
delay[i] = System.nanoTime() - delay[i];
delay[i] = delay[i] / (1000000);
/*
if(empty_index<BUFFER_SIZE_CLIENT)
{
buffer_string[empty_index]=new String(reply.getData());
empty_index++;
}
else
{
for(j=0;j<BUFFER_SIZE_CLIENT-1;j++)
{
buffer_string[j]=buffer_string[j+1];
}
buffer_string[BUFFER_SIZE_CLIENT-1]=new String(reply.getData());
}*/
// display_buffer(buffer_string);
}
Arrays.sort(delay);
float delay2[] = new float[filesize / S1.PACKET_SIZE];
for (i = 0; i < delay2.length; i++) {
delay2[i] = delay[delay.length - i - 1];
}
// delay2 stores the array in descending values
float[] Sk = new float[filesize / S1.PACKET_SIZE];
Sk[0] = (float) 0.0;
for (i = 1; i < filesize / S1.PACKET_SIZE; i++) {
for (j = 1; j <= i; j++) {
Sk[i] = Sk[i] + delay2[j];
}
Sk[i] = Sk[i] / (10 * i);
}
make_output(Sk);
System.out.format(
"Sk at 2=%f\n,10=%f\n,20=%f\n,100=%f\n and 30000=%f\n ",
Sk[1], Sk[9], Sk[19], Sk[99], Sk[29999]);
// display_buffer(buffer_string);
skt.close();
}
}
public static void main(String[] args) throws Exception {
//////////////////// STAGE A//////////////////////////////////////////
int portNum = 12235;
// InetAddress ip=InetAddress.getLocalHost();
InetAddress ip = InetAddress.getByName("attu2.cs.washington.edu");
DatagramSocket sock = new DatagramSocket();
byte[] response = new byte[HEADER_SIZE + 16];
String partA = "hello world\0";
byte[] buf = createBuffer(partA.getBytes(), 0, STEP1);
DatagramPacket packet = new DatagramPacket(buf, buf.length, ip, portNum);
sock.send(packet);
packet = new DatagramPacket(response, response.length);
sock.receive(packet);
int[] a2 = partA(response); // putting the 4 ints from server into int[]
// for (int i = 0; i < a2.length; i++) {
// System.out.println(a2[i]);
// }
////////////////////// STAGE B////////////////////////////////////////
int numSent = 0;
int send = a2[0];
int len = a2[1];
portNum = a2[2];
int secretA = a2[3];
System.out.println("The secrets:\nA: " + secretA);
sock.setSoTimeout(500); // .5s
while (numSent < send) {
// create packet
buf = createBuffer(partB(numSent, len), secretA, STEP1);
packet = new DatagramPacket(buf, buf.length, ip, portNum);
sock.send(packet);
// send packet
try {
sock.receive(new DatagramPacket(response, response.length));
numSent++;
ByteBuffer temp = ByteBuffer.wrap(response);
checkHeader(temp, 4, secretA, STEP1);
// System.out.println(temp.getInt()); // For debug. See if counts up by 1
} catch (SocketTimeoutException e) {
// if there's a timeout, try again
continue;
}
}
response = new byte[HEADER_SIZE + 8]; // 8 bytes -- 2 integers
sock.receive(new DatagramPacket(response, response.length));
ByteBuffer bb = ByteBuffer.wrap(response);
// Header
checkHeader(bb, 8, secretA, STEP2);
// reset the port number to the one given
portNum = bb.getInt();
int secretB = bb.getInt();
System.out.println("B: " + secretB);
// close the UDP socket
sock.close();
/////////////////////////// STAGE C///////////////////////////////////
Socket socket = new Socket(ip, portNum);
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
response = new byte[HEADER_SIZE + 16]; // 4 ints given to us this time
in.read(response);
bb = ByteBuffer.wrap(response);
// Header
checkHeader(bb, 13, secretB, STEP2);
// num2 len2 secretC and char c
numSent = bb.getInt();
len = bb.getInt();
int secretC = bb.getInt();
System.out.println("C: " + secretC);
// stage d
byte c = (byte) bb.getChar();
buf = new byte[len];
Arrays.fill(buf, c);
for (int i = 0; i < numSent; i++) {
byte[] b = createBuffer(buf, secretC, STEP1);
out.write(b);
}
response = new byte[12 + 4]; // one integer. secretD plus header
in.read(response);
bb = ByteBuffer.wrap(response);
checkHeader(bb, 4, secretC, STEP2);
int secretD = bb.getInt();
socket.close();
in.close();
out.close();
System.out.println("D: " + secretD);
}
@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 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();
}
/** 用广播方式发送一条消息 */
public void send(String topic, byte[] infobuf)
throws
UDPBaseException { // System.out.println ("Sending-----["+topic+"]["+infobuf.length+"]") ;
// log.log("Sending-----["+topic+"]["+infobuf.length+"]") ;
if (bInitNull) {
return;
}
if (DEBUG) {
log("UdpBase Sending--->>[" + topic + "][" + infobuf.length + "]");
}
if (topic.length() > 150) {
throw new UDPBaseException("Topic is too long!!");
}
if (infobuf == null || infobuf.length == 0) {
throw new UDPBaseException("Info to be send cannot null!");
}
try {
String tmpid = getOneID();
// System.out.println ("ONE ID="+tmpid) ;
int bs = infobuf.length / MAX_PACKET_LENGTH;
int sy = infobuf.length % MAX_PACKET_LENGTH;
int pknum = bs + (sy == 0 ? 0 : 1);
DatagramPacket packet = null;
HeaderItem topicHeader = new HeaderItem(topic);
HeaderItem idHeader = new HeaderItem(tmpid);
byte[] tmpb = null;
for (int i = 0; i < bs; i++) {
// if (i>0)//循环发送信息每次发送间加间隔，以提高发送成功率
Thread.sleep(LOOP_SEND_INTERVAL);
// 增加顺序头
HeaderItem orderHeader = new HeaderItem("" + pknum + "_" + i);
tmpb =
HeaderItem.appendHeaderItem(
infobuf, i * MAX_PACKET_LENGTH, MAX_PACKET_LENGTH, orderHeader);
// 增加唯一id
tmpb = HeaderItem.appendHeaderItem(tmpb, idHeader);
// 增加主题头
tmpb = HeaderItem.appendHeaderItem(tmpb, topicHeader);
packet = new DatagramPacket(tmpb, 0, tmpb.length, group, RECV_PORT);
// System.out.println("send package");
sendSocket.send(packet);
}
if (sy > 0) {
Thread.sleep(LOOP_SEND_INTERVAL);
// 增加顺序头
HeaderItem orderHeader = new HeaderItem("" + pknum + "_" + bs);
tmpb = HeaderItem.appendHeaderItem(infobuf, bs * MAX_PACKET_LENGTH, sy, orderHeader);
// 增加唯一id
tmpb = HeaderItem.appendHeaderItem(tmpb, idHeader);
// 增加主题头
tmpb = HeaderItem.appendHeaderItem(tmpb, topicHeader);
packet = new DatagramPacket(tmpb, 0, tmpb.length, group, RECV_PORT);
// System.out.println("send.."+new String(tmpb));
sendSocket.send(packet);
}
} catch (Exception e) {
e.printStackTrace();
throw new UDPBaseException("UDPBase send() error=\n" + e.toString());
}
}
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 void run() {
try {
byte[] out_data = new byte[pkt_size];
InetAddress dst_addr = InetAddress.getByName("127.0.0.1");
// To register the recv_port at the UnreliNet first
DatagramPacket out_pkt =
new DatagramPacket(
("REG:" + recv_port).getBytes(),
("REG:" + recv_port).getBytes().length,
dst_addr,
dst_port);
sk_out.send(out_pkt);
int len = (int) (new File(inPath).length());
FileInputStream fis = new FileInputStream(inPath);
int currbytes = 0;
int flag = 0;
byte currentbyte[] = new byte[850];
try {
while (true) {
out_data = outPath.getBytes();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
outputStream.write("fNm".getBytes());
outputStream.write(out_data);
outputStream.write("fNm".getBytes());
outputStream.write("dAtA".getBytes());
if (curr == seq) {
if (flag == 1) {
// empty packet to signify finish
DatagramPacket final_pkt =
new DatagramPacket(
"afIlEdAtAFINdAtAcRc975554582cRcsEq-1sEqafIlE".getBytes(),
"afIlEdAtAFINdAtAcRc975554582cRcsEq-1sEqafIlE".getBytes().length,
dst_addr,
dst_port);
for (int i = 0; i < 20; i++) sk_out.send(final_pkt);
System.exit(0);
}
if (currbytes + 850 <= len) {
currentbyte = new byte[850];
fis.read(currentbyte, 0, 850);
currbytes += 850;
} else {
currentbyte = new byte[len - currbytes];
fis.read(currentbyte, 0, len - currbytes);
flag = 1;
}
}
currentbyte = process(currentbyte);
outputStream.write(currentbyte);
outputStream.write("dAtA".getBytes());
byte fin[] = outputStream.toByteArray();
System.out.println();
System.out.println("CRC pkt size:" + fin.length);
// update checksum
Checksum checksum = new CRC32();
checksum.update(fin, 0, fin.length);
long checksumValue = checksum.getValue();
outputStream = new ByteArrayOutputStream();
outputStream.write("afIlE".getBytes());
outputStream.write(fin);
outputStream.write("fIlE".getBytes());
outputStream.write("cRc".getBytes());
outputStream.write(String.valueOf(checksumValue).getBytes());
outputStream.write("cRc".getBytes());
outputStream.write("sEq".getBytes());
outputStream.write(String.valueOf(seq).getBytes());
outputStream.write("sEqa".getBytes());
byte pkt[] = outputStream.toByteArray();
curr = seq;
seq++;
System.out.println("total size: " + pkt.length);
// send the packet
out_pkt = new DatagramPacket(pkt, pkt.length, dst_addr, dst_port);
sk_out.send(out_pkt);
// print info
for (int i = 0; i < currentbyte.length; ++i) System.out.print((char) currentbyte[i]);
System.out.println();
// wait for a while
for (int i = 0; i < 5; i++) {
sleep(send_interval);
if (curr == seq) {
break;
} else if (i == 4) {
curr--;
seq--;
break;
}
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
sk_out.close();
}
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
}