public void run() {
if (ServerSocket == null) return;
while (true) {
try {
InetAddress address;
int port;
DatagramPacket packet;
byte[] data = new byte[1460];
packet = new DatagramPacket(data, data.length);
ServerSocket.receive(packet);
//
//
address = packet.getAddress();
port = packet.getPort();
System.out.println("get the Client port is: " + port);
System.out.println("get the data length is: " + data.length);
FileWriter fw = new FileWriter("Fortunes.txt");
PrintWriter out = new PrintWriter(fw);
for (int i = 0; i < data.length; i++) {
out.print(data[i] + " ");
}
out.close();
System.out.println("Data has been writen to destination!");
packet = new DatagramPacket(data, data.length, address, port);
ServerSocket.send(packet);
System.out.println("Respond has been made!");
} catch (Exception e) {
System.err.println("Exception: " + e);
e.printStackTrace();
}
}
}
@Scheduled(fixedDelay = Integer.MAX_VALUE)
public void startListening() {
if (disable) {
return;
}
log.info("Starting UPNP Discovery Listener");
try (DatagramSocket responseSocket = new DatagramSocket(upnpResponsePort);
MulticastSocket upnpMulticastSocket = new MulticastSocket(UPNP_DISCOVERY_PORT); ) {
InetSocketAddress socketAddress =
new InetSocketAddress(UPNP_MULTICAST_ADDRESS, UPNP_DISCOVERY_PORT);
Enumeration<NetworkInterface> ifs = NetworkInterface.getNetworkInterfaces();
while (ifs.hasMoreElements()) {
NetworkInterface xface = ifs.nextElement();
Enumeration<InetAddress> addrs = xface.getInetAddresses();
String name = xface.getName();
int IPsPerNic = 0;
while (addrs.hasMoreElements()) {
InetAddress addr = addrs.nextElement();
log.debug(name + " ... has addr " + addr);
if (InetAddressUtils.isIPv4Address(addr.getHostAddress())) {
IPsPerNic++;
}
}
log.debug("Checking " + name + " to our interface set");
if (IPsPerNic > 0) {
upnpMulticastSocket.joinGroup(socketAddress, xface);
log.debug("Adding " + name + " to our interface set");
}
}
while (true) { // trigger shutdown here
byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
upnpMulticastSocket.receive(packet);
String packetString = new String(packet.getData());
if (isSSDPDiscovery(packetString)) {
log.debug(
"Got SSDP Discovery packet from "
+ packet.getAddress().getHostAddress()
+ ":"
+ packet.getPort());
sendUpnpResponse(responseSocket, packet.getAddress(), packet.getPort());
}
}
} catch (IOException e) {
log.error("UpnpListener encountered an error. Shutting down", e);
ConfigurableApplicationContext context =
(ConfigurableApplicationContext) UpnpListener.this.applicationContext;
context.close();
}
log.info("UPNP Discovery Listener Stopped");
}
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();
}
/**
* 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);
}
}
}
}
public static void doEcho(int port) throws IOException {
byte[] buf = new byte[BUF_SIZE];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
DatagramSocket sock = new DatagramSocket(port);
System.out.println(
"Starting UDP echo on"
+ sock.getLocalAddress().getHostAddress()
+ ":"
+ sock.getLocalPort());
while (true) {
try {
sock.receive(packet);
sock.send(packet);
System.out.print(
"UDP From: "
+ packet.getAddress().getHostAddress()
+ ":"
+ packet.getPort()
+ "\n"
+ new String(packet.getData(), 0, packet.getLength())
+ "\n");
System.out.flush();
packet.setLength(buf.length);
// packet = new DatagramPacket(buf,buf.length);
} catch (IOException io_ex) {
}
}
}
public void send(byte[] buf, DatagramPacket dp) throws InterruptedException, IOException {
StringBuilder source = new StringBuilder();
source.append(dp.getAddress());
String dataType = type;
byte[] trimmedBuf = Arrays.copyOf(buf, dp.getLength());
String rawPRI = new String(trimmedBuf, 1, 4, Charset.forName("UTF-8"));
int i = rawPRI.indexOf(">");
if (i <= 3 && i > -1) {
String priorityStr = rawPRI.substring(0, i);
int priority = 0;
int facility = 0;
try {
priority = Integer.parseInt(priorityStr);
facility = (priority >> 3) << 3;
facility = facility / 8;
dataType = facilityMap.get(facility);
} catch (NumberFormatException nfe) {
log.warn("Unsupported format detected by SyslogAdaptor:" + Arrays.toString(trimmedBuf));
}
}
bytesReceived += trimmedBuf.length;
Chunk c =
new ChunkImpl(dataType, source.toString(), bytesReceived, trimmedBuf, SyslogAdaptor.this);
dest.add(c);
}
public void run() {
System.out.println("ExeUDPServer开始监听..." + UDP_PORT);
DatagramSocket ds = null;
try {
ds = new DatagramSocket(UDP_PORT);
} catch (BindException e) {
System.out.println("UDP端口使用中...请重关闭程序启服务器");
} catch (SocketException e) {
e.printStackTrace();
}
while (ds != null) {
DatagramPacket dp = new DatagramPacket(buf, buf.length);
try {
ds.receive(dp);
// 得到把该数据包发来的端口和Ip
int rport = dp.getPort();
InetAddress addr = dp.getAddress();
String recvStr = new String(dp.getData(), 0, dp.getLength());
System.out.println("Server receive：" + recvStr + " from " + addr + " " + rport);
// 给客户端回应
String sendStr = "echo of " + recvStr;
byte[] sendBuf;
sendBuf = sendStr.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendBuf, sendBuf.length, addr, rport);
ds.send(sendPacket);
} catch (IOException e) {
e.printStackTrace();
}
}
}
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 void run() {
while (moreQuotes) {
try {
byte[] buf = new byte[256];
// receive request
DatagramPacket packet = new DatagramPacket(buf, buf.length);
socket.receive(packet); // containing IP ecc.
// figure out response
String dString = null;
if (in == null) dString = new Date().toString();
else dString = getNextQuote();
buf = dString.getBytes();
// send the response to the client at "address" and "port"
InetAddress address = packet.getAddress();
int port = packet.getPort();
packet = new DatagramPacket(buf, buf.length, address, port);
socket.send(packet);
} catch (IOException e) {
e.printStackTrace();
moreQuotes = false;
}
}
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);
}
}
}
}
/** Receive loop for private messaqes. Can be stopped with {@link #setRunning(boolean)} */
private void receivePrivateMessages() {
while (isRunning()) {
try {
final byte[] buf = new byte[BUFFER_SIZE];
final DatagramPacket receivePacket = new DatagramPacket(buf, buf.length);
if (LOG.isDebugEnabled()) {
LOG.debug(
"Waiting for private message, listening on port " + privateSocket.getLocalPort());
}
privateSocket.receive(receivePacket); // wait for a packet
final String data = toString(receivePacket);
if (LOG.isDebugEnabled()) {
LOG.debug("Got a private message: " + data);
}
if (LOG.isDebugEnabled()) {
LOG.debug(
"Received "
+ data
+ " from "
+ receivePacket.getAddress()
+ ":"
+ receivePacket.getPort()
+ ".");
}
processPrivateMessage(data);
} catch (IOException e) {
LOG.error(BUNDLE_MARKER, e.toString(), e);
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("Stopped listening to private messages.");
}
}
public static void main(String args[]) throws Exception {
String serverHostname = args[0];
int portNumber = Integer.parseInt(args[1]);
try {
BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
DatagramSocket clientSocket = new DatagramSocket();
InetAddress IPAddress = InetAddress.getByName(serverHostname);
System.out.println("Attempting to connect to " + IPAddress + ") via UDP port " + portNumber);
System.out.println("Enter \"Quit\" to exit program");
while (true) {
byte[] sendData = new byte[1024];
byte[] receiveData = new byte[1024];
System.out.print("Enter Message: ");
String sentence = inFromUser.readLine();
if (sentence.equals("Quit")) break;
sendData = sentence.getBytes();
System.out.println("Sending data to " + sendData.length + " bytes to server.");
DatagramPacket sendPacket =
new DatagramPacket(sendData, sendData.length, IPAddress, portNumber);
clientSocket.send(sendPacket);
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
System.out.println("Waiting for return packet");
clientSocket.setSoTimeout(10000);
try {
clientSocket.receive(receivePacket);
String modifiedSentence = new String(receivePacket.getData());
InetAddress returnIPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
System.out.println("From server at: " + returnIPAddress + ":" + port);
System.out.println("Message: " + modifiedSentence);
} catch (SocketTimeoutException ste) {
System.out.println("Timeout Occurred: Packet assumed lost");
}
System.out.print("\n");
}
clientSocket.close();
} catch (UnknownHostException ex) {
System.err.println(ex);
} catch (IOException ex) {
System.err.println(ex);
}
}
/**
* 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());
}
}
/**
* Sends a datagram packet to the destination, with a TTL (time- to-live) other than the default
* for the socket. This method need only be used in instances where a particular TTL is desired;
* otherwise it is preferable to set a TTL once on the socket, and use that default TTL for all
* packets. This method does <B>not </B> alter the default TTL for the socket. Its behavior may be
* affected by {@code setInterface}.
*
* <p>If there is a security manager, this method first performs some security checks. First, if
* {@code p.getAddress().isMulticastAddress()} is true, this method calls the security manager's
* {@code checkMulticast} method with {@code p.getAddress()} and {@code ttl} as its arguments. If
* the evaluation of that expression is false, this method instead calls the security manager's
* {@code checkConnect} method with arguments {@code p.getAddress().getHostAddress()} and {@code
* p.getPort()}. Each call to a security manager method could result in a SecurityException if the
* operation is not allowed.
*
* @param p is the packet to be sent. The packet should contain the destination multicast ip
* address and the data to be sent. One does not need to be the member of the group to send
* packets to a destination multicast address.
* @param ttl optional time to live for multicast packet. default ttl is 1.
* @exception IOException is raised if an error occurs i.e error while setting ttl.
* @exception SecurityException if a security manager exists and its {@code checkMulticast} or
* {@code checkConnect} method doesn't allow the send.
* @deprecated Use the following code or its equivalent instead: ...... int ttl =
* mcastSocket.getTimeToLive(); mcastSocket.setTimeToLive(newttl); mcastSocket.send(p);
* mcastSocket.setTimeToLive(ttl); ......
* @see DatagramSocket#send
* @see DatagramSocket#receive
* @see SecurityManager#checkMulticast(java.net.InetAddress, byte)
* @see SecurityManager#checkConnect
*/
@Deprecated
public void send(DatagramPacket p, byte ttl) throws IOException {
if (isClosed()) throw new SocketException("Socket is closed");
checkAddress(p.getAddress(), "send");
synchronized (ttlLock) {
synchronized (p) {
if (connectState == ST_NOT_CONNECTED) {
// Security manager makes sure that the multicast address
// is allowed one and that the ttl used is less
// than the allowed maxttl.
SecurityManager security = System.getSecurityManager();
if (security != null) {
if (p.getAddress().isMulticastAddress()) {
security.checkMulticast(p.getAddress(), ttl);
} else {
security.checkConnect(p.getAddress().getHostAddress(), p.getPort());
}
}
} else {
// we're connected
InetAddress packetAddress = null;
packetAddress = p.getAddress();
if (packetAddress == null) {
p.setAddress(connectedAddress);
p.setPort(connectedPort);
} else if ((!packetAddress.equals(connectedAddress)) || p.getPort() != connectedPort) {
throw new SecurityException("connected address and packet address" + " differ");
}
}
byte dttl = getTTL();
try {
if (ttl != dttl) {
// set the ttl
getImpl().setTTL(ttl);
}
// call the datagram method to send
getImpl().send(p);
} finally {
// set it back to default
if (ttl != dttl) {
getImpl().setTTL(dttl);
}
}
} // synch p
} // synch ttl
} // method
@Override
protected int peek(InetAddress sender) throws IOException {
// We don't actually want the data: we just want the DatagramPacket's filled-in address.
DatagramPacket packet = new DatagramPacket(EmptyArray.BYTE, 0);
int result = peekData(packet);
// Note: evil side-effect on InetAddress! This method should have returned InetSocketAddress!
sender.ipaddress = packet.getAddress().getAddress();
return result;
}
private String lookupFarm() {
if (Response != null) {
if (Response.isStillValid()) {
return Response.getFarmID();
}
Response = null;
}
try {
InetAddress CDPServer;
DatagramSocket Socket;
CDPQuery Query;
byte[] Buffer;
DatagramPacket Packet;
/* Get the IP address of the CDP servers. */
CDPServer = InetAddress.getByName(CDPServerName);
/* Create a UDP socket for the CDP query. */
Socket = new DatagramSocket();
Socket.setSoTimeout(CDPTimeout);
/* Build the CDP query. */
Query = new CDPQuery(Constants.AZUREUS_NAME + " " + Constants.AZUREUS_VERSION);
Buffer = Query.getBytes();
Packet = new DatagramPacket(Buffer, Buffer.length, CDPServer, CDPPort);
/* Send the query to the CDP server. */
Socket.send(Packet);
/* Receive the CDP response. */
Buffer = new byte[CDPResponse.MaxSize];
Packet.setData(Buffer);
Socket.receive(Packet);
if (Packet.getAddress() != CDPServer || Packet.getPort() != CDPPort)
throw (new Exception("CDP server address mismatch on response"));
/* Parse the CDP response. */
Response = new CDPResponse(Packet.getData());
/* Return the farmID from the CDP response. */
return Response.getFarmID();
} catch (Throwable Excpt) {
if (Excpt instanceof UnknownHostException) {
} else {
Excpt.printStackTrace();
}
return "default";
}
}
public void respond(DatagramPacket packet) {
byte[] data = new byte[packet.getLength()];
System.arraycopy(packet.getData(), 0, data, 0, packet.getLength());
try {
String s = new String(data, "8859_1");
System.out.println(packet.getAddress() + " at port " + packet.getPort() + " says " + s);
} catch (java.io.UnsupportedEncodingException ex) {
// This shouldn't happen
}
}
/**
* {@collect.stats} {@description.open} Sends a datagram packet from this socket. The <code>
* DatagramPacket</code> includes information indicating the data to be sent, its length, the IP
* address of the remote host, and the port number on the remote host.
*
* <p>If there is a security manager, and the socket is not currently connected to a remote
* address, this method first performs some security checks. First, if <code>
* p.getAddress().isMulticastAddress()</code> is true, this method calls the security manager's
* <code>checkMulticast</code> method with <code>p.getAddress()</code> as its argument. If the
* evaluation of that expression is false, this method instead calls the security manager's <code>
* checkConnect</code> method with arguments <code>p.getAddress().getHostAddress()</code> and
* <code>p.getPort()</code>. Each call to a security manager method could result in a
* SecurityException if the operation is not allowed. {@description.close}
*
* @param p the <code>DatagramPacket</code> to be sent.
* @exception IOException if an I/O error occurs.
* @exception SecurityException if a security manager exists and its <code>checkMulticast</code>
* or <code>checkConnect</code> method doesn't allow the send.
* @exception PortUnreachableException may be thrown if the socket is connected to a currently
* unreachable destination. Note, there is no guarantee that the exception will be thrown.
* @exception java.nio.channels.IllegalBlockingModeException if this socket has an associated
* channel, and the channel is in non-blocking mode.
* @see java.net.DatagramPacket
* @see SecurityManager#checkMulticast(InetAddress)
* @see SecurityManager#checkConnect
* @revised 1.4
* @spec JSR-51
*/
public void send(DatagramPacket p) throws IOException {
InetAddress packetAddress = null;
synchronized (p) {
if (isClosed()) throw new SocketException("Socket is closed");
checkAddress(p.getAddress(), "send");
if (connectState == ST_NOT_CONNECTED) {
// check the address is ok wiht the security manager on every send.
SecurityManager security = System.getSecurityManager();
// The reason you want to synchronize on datagram packet
// is because you dont want an applet to change the address
// while you are trying to send the packet for example
// after the security check but before the send.
if (security != null) {
if (p.getAddress().isMulticastAddress()) {
security.checkMulticast(p.getAddress());
} else {
security.checkConnect(p.getAddress().getHostAddress(), p.getPort());
}
}
} else {
// we're connected
packetAddress = p.getAddress();
if (packetAddress == null) {
p.setAddress(connectedAddress);
p.setPort(connectedPort);
} else if ((!packetAddress.equals(connectedAddress)) || p.getPort() != connectedPort) {
throw new IllegalArgumentException(
"connected address " + "and packet address" + " differ");
}
}
// Check whether the socket is bound
if (!isBound()) bind(new InetSocketAddress(0));
// call the method to send
getImpl().send(p);
}
}
private void readSendPacket(DatagramPacket sendPacket) {
// print log
System.out.println("Server: sending a packet...");
System.out.println("To host: " + sendPacket.getAddress());
System.out.println("Destination host port: " + sendPacket.getPort());
Request req = new Request(sendPacket.getData(), sendPacket.getLength());
String reqString = req.getString();
byte reqBytes[] = req.getByteArray();
System.out.print("String: '" + reqString + "'\n");
System.out.print("Bytes: '");
int i = 0;
while (i < req.getLength()) {
System.out.print(reqBytes[i++]);
}
System.out.print("'\n");
}
protected void recvLoop(DatagramSocket socket, InetSocketAddress address) {
long successful_accepts = 0;
long failed_accepts = 0;
while (!closed) {
try {
byte[] buf = new byte[PRUDPPacket.MAX_PACKET_SIZE];
DatagramPacket packet = new DatagramPacket(buf, buf.length, address);
socket.receive(packet);
successful_accepts++;
failed_accepts = 0;
String ip = packet.getAddress().getHostAddress();
if (!ip_filter.isInRange(ip, "Tracker", null)) {
thread_pool.run(new TRTrackerServerProcessorUDP(this, socket, packet));
}
} catch (Throwable e) {
if (!closed) {
failed_accepts++;
Logger.log(new LogEvent(LOGID, "TRTrackerServer: receive failed on port " + port, e));
if ((failed_accepts > 100 && successful_accepts == 0) || failed_accepts > 1000) {
// looks like its not going to work...
// some kind of socket problem
Logger.logTextResource(
new LogAlert(LogAlert.UNREPEATABLE, LogAlert.AT_ERROR, "Network.alert.acceptfail"),
new String[] {"" + port, "UDP"});
break;
}
}
}
}
}
private void readReceivePacket(DatagramPacket receivePacket) {
// print log
Request req = new Request(receivePacket.getData(), receivePacket.getLength());
System.out.println("Server: receiving a packet...");
System.out.println("From host: " + receivePacket.getAddress());
System.out.println("Host port: " + receivePacket.getPort());
String reqString = req.getString();
byte reqBytes[] = req.getByteArray();
System.out.print("String: '" + reqString + "'\n");
System.out.print("Bytes: '");
int i = 0;
while (i < req.getLength()) {
System.out.print(reqBytes[i++]);
}
System.out.print("'\n");
System.out.println("Server: packet received.\n");
}
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() {
byte[] data = new byte[packetSize];
packet = new DatagramPacket(data, data.length);
for (; ; ) {
// receive the packets
try {
socket.receive(packet);
packetSendReceive++;
String str = new String(packet.getData());
System.out.println(
" Time signal received from" + packet.getAddress() + " Time is : " + str);
} catch (IOException e) {
e.printStackTrace();
}
} // for
}
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);
}
}
/**
* Main method keeps waiting for request and do math operation accordingly
*
* @param args
*/
public static void main(String args[]) {
DatagramSocket aSocket = null;
try {
aSocket = new DatagramSocket(6789);
byte[] buffer = new byte[1000];
while (true) {
DatagramPacket request = new DatagramPacket(buffer, buffer.length);
aSocket.receive(request);
// receive byte array of equation and put it in string
String equation = new String(request.getData());
String answer = "";
String[] split = equation.split(" ");
// parse to integer and calculate
String op = split[1];
double var1 = Double.parseDouble(split[0]);
double var2 = Double.parseDouble(split[2]);
if (op.equals("+")) {
answer = Double.toString(var1 + var2);
} else if (op.equals("-")) {
answer = Double.toString(var1 - var2);
} else if (op.toLowerCase().equals("X") || op.toLowerCase().equals("x")) {
answer = Double.toString(var1 * var2);
} else if (op.equals("/")) {
answer = Double.toString(var1 / var2);
}
// send answer back
DatagramPacket reply =
new DatagramPacket(
answer.getBytes(),
(answer.getBytes()).length,
request.getAddress(),
request.getPort());
aSocket.send(reply);
}
} catch (SocketException e) {
System.out.println("Socket: " + e.getMessage());
} catch (IOException e) {
System.out.println("IO: " + e.getMessage());
} finally {
if (aSocket != null) {
aSocket.close();
}
}
}
public static void main(String[] argv) throws Exception {
// ワイルドカードアドレスで待ち受け
DatagramSocket datagram_socket = new DatagramSocket(PORT);
// 受け付けるデータバッファとUDPパケットを作成
byte buffer[] = new byte[1024];
DatagramPacket datagram_packet = new DatagramPacket(buffer, buffer.length);
while (true) {
// UDPパケットを受信
datagram_socket.receive(datagram_packet);
InetAddress inet_address = datagram_packet.getAddress();
String sender_address = inet_address.getHostAddress();
int sender_port = datagram_packet.getPort();
String received_data = new String(datagram_packet.getData(), 0, datagram_packet.getLength());
// 受信したデータを標準出力へ出力
System.out.println("[" + sender_address + ":" + sender_port + "]" + received_data);
}
}
public void run() {
byte[] buf = new byte[BUF_SIZE];
DatagramPacket incomingData = new DatagramPacket(buf, buf.length);
try {
while (true) {
sock.receive(incomingData);
System.out.println(
"UDP From:"
+ incomingData.getAddress().getHostAddress()
+ ":"
+ incomingData.getPort());
System.out.println(new String(incomingData.getData(), 0, incomingData.getLength()));
System.out.flush();
incomingData.setLength(buf.length);
}
} catch (IOException io_ex) {
io_ex.printStackTrace();
}
}
// sends a response to the Client based upon the contents of the receive packet
private void reply(DatagramPacket receivedPacket) {
// verify the packet
byte serverMsg[] = {};
try {
Request recReq = new Request(receivedPacket.getData(), receivedPacket.getLength());
if (!recReq.isValid()) {
throw new IllegalStateException();
}
switch (recReq.getFormat()) {
case RRQ:
serverMsg = new byte[] {0, 3, 0, 1};
break;
case WRQ:
serverMsg = new byte[] {0, 4, 0, 0};
break;
default:
throw new IllegalStateException();
}
} catch (IllegalStateException e) {
e.printStackTrace();
System.exit(1);
}
DatagramPacket sendPacket =
new DatagramPacket(
serverMsg, serverMsg.length, receivedPacket.getAddress(), receivedPacket.getPort());
readSendPacket(sendPacket);
try {
// Send the datagram packet to the client via the send socket.
DatagramSocket sendSocket = new DatagramSocket();
sendSocket.send(sendPacket);
sendSocket.close();
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
System.out.println("Server: packet sent.\n");
}
public static void main(String args[]) throws Exception {
// Open socket loclahost:6000
DatagramSocket serverSocket = new DatagramSocket(6000, InetAddress.getByName("localhost"));
byte[] receiveData = new byte[1024];
byte[] sendData = new byte[1024];
// Hanging on
while (true) {
DatagramPacket readPacket = new DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(readPacket);
String readData = new String(readPacket.getData());
System.out.println("UDP Server, " + readData);
InetAddress ip = readPacket.getAddress();
int port = readPacket.getPort();
String output = "Hello, " + readData;
sendData = output.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, ip, port);
serverSocket.send(sendPacket);
}
}
boolean shouldIgnorePacket(DatagramPacket packet) {
boolean result = false;
if (getAddress() != null) {
InetAddress from = packet.getAddress();
if (from != null) {
if (from.isLinkLocalAddress() && (!getAddress().isLinkLocalAddress())) {
// Ignore linklocal packets on regular interfaces, unless this is
// also a linklocal interface. This is to avoid duplicates. This is
// a terrible hack caused by the lack of an API to get the address
// of the interface on which the packet was received.
result = true;
}
if (from.isLoopbackAddress() && (!getAddress().isLoopbackAddress())) {
// Ignore loopback packets on a regular interface unless this is
// also a loopback interface.
result = true;
}
}
}
return result;
}
