a3/code/jtorx/server/NetHelper.java

   1 import static java.lang.System.out;
   2
   3 import java.net.InetAddress;
   4 import java.net.NetworkInterface;
   5 import java.net.SocketException;
   6 import java.util.Collections;
   7 import java.util.Enumeration;
   8
   9 // this utility displays information on addresses and ports, you don't need to use it
  10 public class NetHelper
  11 {
  12     public static void main(String args[]) throws SocketException {
  13         Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
  14
  15         for (NetworkInterface netIf : Collections.list(nets)) {
  16             out.printf("Display name: %s\n", netIf.getDisplayName());
  17             out.printf("Name: %s\n", netIf.getName());
  18             displayInterfaceInformation(netIf);
  19             displaySubInterfaces(netIf);
  20             out.printf("\n");
  21         }
  22     }
  23
  24         public static NetworkInterface getNetworkInterface(String netName) {
  25                 NetworkInterface netIntf = null;
  26                 try {
  27                         for (Enumeration<NetworkInterface> en = NetworkInterface
  28                                         .getNetworkInterfaces(); en.hasMoreElements();) {
  29                                 NetworkInterface intf = en.nextElement();
  30                                 if (intf.getName().compareToIgnoreCase(netName) == 0) {
  31                                         netIntf = intf;
  32                                         break;
  33                                 }
  34                         }
  35                 } catch (SocketException e) {
  36                         System.out
  37                                         .println("Socket Exception failed to find internet addresses!");
  38                         e.printStackTrace();
  39                         System.exit(0);
  40                 }
  41                 return netIntf;
  42         }
  43
  44         public static InetAddress getFirstNonLocalHost(NetworkInterface netIntf) {
  45                 Enumeration<InetAddress> hosts = netIntf.getInetAddresses();
  46                 InetAddress address = null;
  47                 while (hosts.hasMoreElements()) {
  48                         InetAddress host = hosts.nextElement();
  49                         if (!host.isLinkLocalAddress() && !host.isLoopbackAddress()) {
  50                                 address = host;
  51                                 break;
  52                         }
  53                 }
  54                 return address;
  55         }
  56
  57
  58
  59     static String getMac(NetworkInterface netint) throws SocketException {
  60         byte[] mac = netint.getHardwareAddress();
  61         String rez = "null";
  62         if(mac != null) {
  63                     StringBuilder sb = new StringBuilder();
  64                     for (int i = 0; i < mac.length; i++) {
  65                         sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
  66                     }
  67                     rez = sb.toString();
  68         }
  69         return rez;
  70             //System.out.println(sb.toString());
  71     }
  72
  73     static void displayInterfaceInformation(NetworkInterface netint) throws SocketException {
  74         out.printf("Display name: %s\n", netint.getDisplayName());
  75         out.printf("Name: %s\n", netint.getName());
  76         out.printf("MAC: %s\n", getMac(netint));
  77         Enumeration<InetAddress> inetAddresses = netint.getInetAddresses();
  78         for (InetAddress inetAddress : Collections.list(inetAddresses)) {
  79             out.printf("InetAddress: %s\n", inetAddress);
  80             out.println("LOCAL:" + Boolean.toString(inetAddress.isLoopbackAddress() || inetAddress.isLinkLocalAddress()));
  81         }
  82         out.printf("\n");
  83      }
  84
  85     static void displaySubInterfaces(NetworkInterface netIf) throws SocketException {
  86         Enumeration<NetworkInterface> subIfs = netIf.getSubInterfaces();
  87
  88         for (NetworkInterface subIf : Collections.list(subIfs)) {
  89             out.printf("\tSub Interface Display name: %s\n", subIf.getDisplayName());
  90             out.printf("\tSub Interface Name: %s\n", subIf.getName());
  91             displayInterfaceInformation(subIf);
  92         }
  93      }
  94 }