nfinity.FindPeer.java Source code

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Here is the source code for nfinity.FindPeer.java

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package nfinity;

import java.io.DataInputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.Socket;
import java.net.SocketException;
import java.util.Collections;
import java.util.Enumeration;
import org.apache.commons.net.util.SubnetUtils;

/**
 *
 * @author lumesh
 */
public class FindPeer {
    private String RemotePeerID = null;

    public FindPeer() {
    }

    public String ScanNetwork() {
        try {
            Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
            for (NetworkInterface netint : Collections.list(nets)) {
                Enumeration<InetAddress> inetAddresses = netint.getInetAddresses();
                for (InetAddress inetAddress : Collections.list(inetAddresses)) {
                    if (!inetAddress.getClass().toString().equals("class java.net.Inet6Address")) {
                        if (!inetAddress.isLoopbackAddress()) {
                            try {
                                SubnetUtils utils = new SubnetUtils(inetAddress.getHostAddress() + "/"
                                        + netint.getInterfaceAddresses().get(1).getNetworkPrefixLength());
                                String[] allIps = utils.getInfo().getAllAddresses();
                                return ConnectIP(allIps, inetAddress);
                            } catch (IllegalArgumentException ex) {
                                int prefix = NetworkInterface.getByInetAddress(inetAddress).getInterfaceAddresses()
                                        .get(0).getNetworkPrefixLength();
                                if (!inetAddress.isLoopbackAddress()) {
                                    System.out
                                            .println("IP: " + inetAddress.getHostAddress() + " Prefix: " + prefix);
                                    SubnetUtils utils = new SubnetUtils(
                                            inetAddress.getHostAddress() + "/" + prefix);
                                    String[] allIps = utils.getInfo().getAllAddresses();
                                    return ConnectIP(allIps, inetAddress);
                                }
                            }
                        }
                    }
                }
            }
        } catch (SocketException ex) {
            System.out.println("Connection failed " + ex.getMessage());
        }
        return "Peer not found";
    }

    private String ConnectIP(String[] allIps, InetAddress inetAddress) {
        for (String ip : allIps) {
            if (!ip.equals(inetAddress.getHostAddress())) {
                System.out.println(ip);
                if (ConnectPeerListener(ip)) {
                    return ip;
                }
            }
        }
        return "Peer not found";
    }

    public String GetRemotePeerID() {
        return RemotePeerID;
    }

    public Boolean ConnectPeerListener(String ip) {
        try {
            //Soocket = socket = new Socket(ip, 1000);
            Socket socket = new Socket();
            socket.connect(new InetSocketAddress(ip, 1000), 1000);
            DataInputStream input = new DataInputStream(socket.getInputStream());
            String data = input.readUTF();
            System.out.println(data);
            String rspdata[] = data.split(" ");
            if (!rspdata[2].equals("")) {
                RemotePeerID = rspdata[2];
                return true;
            }
            socket.close();
        } catch (IOException ex) {
            System.out.println("Connection failed " + ex.getMessage());
        }
        return false;
    }
}