/**
* Attempts to log a client in using the authentication server. Authentication server needs to run
* on the same host as the file server.
*
* @throws IOException Error reading from socket.
*/
private void login() throws IOException {
// set up required variables
DatagramSocket clientSocket = new DatagramSocket();
InetAddress authServerIP =
InetAddress
.getLocalHost(); // because authentication server runs on same host as file server
byte[] dataToSend;
byte[] receivedData = new byte[BUFFER_SIZE];
// get username and password
String userName = inFromClient.readLine().trim(); // get username
String password = inFromClient.readLine().trim(); // get password
dataToSend = new String(userName + " " + password).getBytes();
// send the username and password for processing by authentication server
DatagramPacket packetToSend =
new DatagramPacket(dataToSend, dataToSend.length, authServerIP, AUTHENTICATION_PORT);
clientSocket.send(packetToSend);
// receive the response from the authentication server
DatagramPacket receivedPacket = new DatagramPacket(receivedData, receivedData.length);
clientSocket.receive(receivedPacket);
String receivedString = new String(receivedPacket.getData()).trim();
receivedData = receivedString.getBytes();
if (receivedString.equals("yes")) {
outToClient.writeBytes(receivedString); // successful login
} else {
outToClient.writeBytes("no"); // unsuccessful login
}
}
/** @return */
public static String getIPv4Address() {
String ipv4address = null;
try {
final List<NetworkInterface> networkinterfaces =
Collections.list(NetworkInterface.getNetworkInterfaces());
for (final NetworkInterface networkinterface : networkinterfaces) {
final List<InetAddress> addresses = Collections.list(networkinterface.getInetAddresses());
for (final InetAddress address : addresses) {
if ((address == null) || address.isLoopbackAddress()) {
continue;
}
if (address instanceof Inet4Address) {
ipv4address = address.getHostAddress().toString();
break;
}
}
}
} catch (Exception x) {
DBG.m(x);
}
return ipv4address;
}