Android Open Source - ubihelper Dns Utils

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (c) 2012 The University of Nottingham
 * /*from w  w  w  .  ja v  a 2 s. c o m*/
 * This file is part of ubihelper
 *
 *  ubihelper is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ubihelper is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with ubihelper. If not, see <http://www.gnu.org/licenses/>.
 *  
 *  @author Chris Greenhalgh (cmg@cs.nott.ac.uk), The University of Nottingham
 */

package uk.ac.horizon.ubihelper.dns;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.logging.Logger;

/**
 * @author cmg
 *
 */
public class DnsUtils {
  static Logger logger = Logger.getLogger(DnsUtils.class.getName());
  public static final String UBIHELPER_SERVICE_NAME = "_ubihelper";
  public static final String TCP_PROTOCOL_NAME = "_tcp";
  public static final String LOCAL_DOMAIN_NAME = "local";
  //private static final String TAG = "ubihelper-dnsutils";
  
  public static String getServiceDiscoveryName() {
    return UBIHELPER_SERVICE_NAME+"."+TCP_PROTOCOL_NAME+"."+LOCAL_DOMAIN_NAME;
  }
  public static String ip2string(int ip) {
    // NB at least on my samsung google s the high-byte is in the low bits
    StringBuilder sb = new StringBuilder();
    sb.append(Integer.toString((ip) & 0xff));
    sb.append(".");
    sb.append(Integer.toString((ip >> 8) & 0xff));
    sb.append(".");
    sb.append(Integer.toString((ip >> 16) & 0xff));
    sb.append(".");
    sb.append(Integer.toString((ip >> 24) & 0xff));
    return sb.toString();
  }
  public static NetworkInterface getNetworkInterface(int ip) {
    try {
      InetAddress inet = InetAddress.getByName(ip2string(ip));
      NetworkInterface ni = NetworkInterface.getByInetAddress(inet);
      return ni;
    } catch (Exception e) {
      logger.warning("Error getting network interface "+ip2string(ip)+": "+e.getMessage());
    }
    return null;
  }
}

Java Source Code List

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