private void init() throws IOException {
messageBuffer = new ArrayList();
receiveBuffer = ByteBuffer.allocate(CAPACITY);
sendBuffer = ByteBuffer.allocate(CAPACITY);
buf = new byte[CAPACITY];
channel = DatagramChannel.open();
channel.configureBlocking(false);
InetAddress host = null;
if (getAddress() != null) {
host = InetAddress.getByAddress(getAddress().getBytes());
}
channel.socket().bind(new InetSocketAddress(host, getPort()));
channel.socket().setReceiveBufferSize(CAPACITY);
certifier = new MessageCertifier(this);
extractor = new MessageExtractor(this);
}
static void pinging() throws IOException {
Socket mySocket;
if (!inetAddresses.isEmpty()) {
bcid =
((InterfaceAddress) inetAddresses.get(0))
.getBroadcast()
.getAddress(); // gets the last ip address in subnet
netaddress(
((InterfaceAddress) inetAddresses.get(0))
.getNetworkPrefixLength(), // creats the mask field
((InterfaceAddress) inetAddresses.get(0))
.getAddress()
.getAddress() // creats the myip field
);
byte[] pingip = netid;
for (; ; ) {
InetAddress ping = InetAddress.getByAddress(pingip);
// boolean reachable=ping.isReachable(5000); // This command is doing the same work as
// the ping command in windows
try {
Process ps = Runtime.getRuntime().exec("ping.exe " + ping);
BufferedReader br = new BufferedReader(new InputStreamReader(ps.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
sb.append("\n");
}
y = sb.toString();
System.out.print(sb.toString());
} catch (IOException e) {
e.printStackTrace();
}
if (!contains(y, substring)) {
System.out.println("The ip address " + ping + "is reachable");
for (int port = 0; port < 65536; port++) {
try {
mySocket = new Socket(ping, port);
System.out.println("The port" + port + "on ip:" + ping + "is free.");
mySocket.close();
} catch (IOException c) {
System.out.println("The port" + port + "on ip:" + ping + "is closed.");
}
}
} else
System.out.println(
"The pinged ip addres is unreachable, probably it is not up in your subnet");
pingip[3]++;
if (pingip[3] == (byte) 255) pingip[2]++;
if (pingip[2]
== (byte)
255) // here we ping ips in our subnet from the first ip address to the last one
pingip[1]++;
if (pingip[1] == (byte) 255) pingip[0]++;
if (pingip[0]
== (byte)
127) // beacuase the ip addresses that are not in class A have at least 2 bytes of
// net ids
break;
if (pingip[0] == bcid[0]
& pingip[1] == bcid[1]
& pingip[2] == bcid[2]
& pingip[3] == bcid[3]) break;
}
} else System.out.println("null pointer exception");
}
/** {@inheritDoc} */
@Override
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
super.readExternal(in);
addr = InetAddress.getByAddress(U.readByteArray(in));
}
