Alachisoft.NCache.Common.Net.Helper Maven / Gradle / Ivy

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package Alachisoft.NCache.Common.Net;

import Alachisoft.NCache.Common.Common;

import java.io.IOException;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.ServerSocket;

/**
 * @author Muneeb Shahid
 */
public class Helper {

    public static int getFreeTCPPort(InetAddress ipAddress) {
        ServerSocket ss = null;
        try {
            ss = new ServerSocket(0);
            return ss.getLocalPort();
        } catch (IOException iOE) {
        } finally {
            if (ss != null) {
                try {
                    ss.close();
                } catch (IOException e) {
                }
            }
        }
        return 0;
    }

    public static int getFreePort(InetAddress ipAddress) {
        int port = getFreeTCPPort(ipAddress);
        int retry = 20;
        while (retry > 0) {
            if (isUDPPortFree(port, ipAddress)) {
                return port;
            }
            retry -= 1;
        }
        return 0;
    }

    public static boolean isTCPPortFree(int port, InetAddress addr) {
        ServerSocket ss = null;
        try {
            ss = new ServerSocket(port);
            ss.setReuseAddress(true);
            return true;
        } catch (IOException io) {
        } finally {
            if (ss != null) {
                try {
                    ss.close();
                } catch (IOException e) {
                }
            }
        }
        return false;

    }

    public static boolean isUDPPortFree(int port, InetAddress addr) {
        DatagramSocket ds = null;
        try {
            ds = new DatagramSocket(port, addr);
            ds.setReuseAddress(true);
            return true;
        } catch (IOException io) {
        } finally {
            if (ds != null) {
                ds.close();
            }
        }
        return false;
    }

    /**
     * @param port
     * @param addr
     * @return true if port is not being used by any TCP and UDP Socket.
     */
    public static boolean isPortFree(int port, InetAddress addr) {
        return isTCPPortFree(port, addr) && isUDPPortFree(port, addr);
    }

    public static java.net.InetAddress getFirstNonLoopbackAddress() {
        try {
            java.util.Enumeration networkInterfaces = NetworkInterface.getNetworkInterfaces();
            while (networkInterfaces.hasMoreElements()) {
                NetworkInterface networkdInterface = (NetworkInterface) networkInterfaces.nextElement();
                java.util.Enumeration inetAddresses = networkdInterface.getInetAddresses();
                while (inetAddresses.hasMoreElements()) {
                    java.net.InetAddress address = (java.net.InetAddress) inetAddresses.nextElement();
                    if (address.isLoopbackAddress()) {
                        continue;
                    }
                    if (Common.is(address, java.net.Inet4Address.class)) {
                        return address;
                    }
                }
            }
        } catch (IOException iOException) {
        }
        return null;
    }
}