content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  package com.aliyun.odps.commons.util;
  
  import java.net.InetAddress;
  import java.net.NetworkInterface;
  import java.net.SocketException;
  import java.net.UnknownHostException;
  
  public class OSUtils {
  
    /**
     * Get OS name
     *
     * @return
     */
    public static String getOS() {
      return System.getProperties().getProperty("os.name");
    }
  
    public static String getIpAddress() {
      try {
        return InetAddress.getLocalHost().getHostAddress();
      } catch (UnknownHostException e) {
        return "unknown";
      }
    }
  
    public static String getMacAddress() {
      try {
        InetAddress address = InetAddress.getLocalHost();
        byte[] macAddressBytes = NetworkInterface.getByInetAddress(address).getHardwareAddress();
        // The MAC address may not exist, in this case, return "unknown" immediately
        if (macAddressBytes == null) {
          return "unknown";
        }
  
        StringBuilder macBuilder = new StringBuilder();
        for (int i = 0; i < macAddressBytes.length; i++) {
          macBuilder.append(String.format(
              "%02X%s", macAddressBytes[i], (i < macAddressBytes.length - 1) ? "-" : ""));
        }
        return macBuilder.toString();
      } catch (UnknownHostException e) {
        return "unknown";
      } catch (SocketException e) {
        return "unknown";
      } catch (NullPointerException e) {
        return "unknown";
      }
    }
  }
  