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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.net;
     18 
     19 import android.os.Parcelable;
     20 import android.os.Parcel;
     21 
     22 import java.net.InetAddress;
     23 import java.net.UnknownHostException;
     24 
     25 /**
     26  * A simple object for retrieving / setting an interfaces configuration
     27  * @hide
     28  */
     29 public class InterfaceConfiguration implements Parcelable {
     30     public String hwAddr;
     31     public LinkAddress addr;
     32     public String interfaceFlags;
     33 
     34     public InterfaceConfiguration() {
     35         super();
     36     }
     37 
     38     public String toString() {
     39         StringBuffer str = new StringBuffer();
     40 
     41         str.append("ipddress ");
     42         str.append((addr != null) ? addr.toString() : "NULL");
     43         str.append(" flags ").append(interfaceFlags);
     44         str.append(" hwaddr ").append(hwAddr);
     45 
     46         return str.toString();
     47     }
     48 
     49     /**
     50      * This function determines if the interface is up and has a valid IP
     51      * configuration (IP address has a non zero octet).
     52      *
     53      * Note: It is supposed to be quick and hence should not initiate
     54      * any network activity
     55      */
     56     public boolean isActive() {
     57         try {
     58             if(interfaceFlags.contains("up")) {
     59                 for (byte b : addr.getAddress().getAddress()) {
     60                     if (b != 0) return true;
     61                 }
     62             }
     63         } catch (NullPointerException e) {
     64             return false;
     65         }
     66         return false;
     67     }
     68 
     69     /** Implement the Parcelable interface {@hide} */
     70     public int describeContents() {
     71         return 0;
     72     }
     73 
     74     /** Implement the Parcelable interface {@hide} */
     75     public void writeToParcel(Parcel dest, int flags) {
     76         dest.writeString(hwAddr);
     77         if (addr != null) {
     78             dest.writeByte((byte)1);
     79             dest.writeParcelable(addr, flags);
     80         } else {
     81             dest.writeByte((byte)0);
     82         }
     83         dest.writeString(interfaceFlags);
     84     }
     85 
     86     /** Implement the Parcelable interface {@hide} */
     87     public static final Creator<InterfaceConfiguration> CREATOR =
     88         new Creator<InterfaceConfiguration>() {
     89             public InterfaceConfiguration createFromParcel(Parcel in) {
     90                 InterfaceConfiguration info = new InterfaceConfiguration();
     91                 info.hwAddr = in.readString();
     92                 if (in.readByte() == 1) {
     93                     info.addr = in.readParcelable(null);
     94                 }
     95                 info.interfaceFlags = in.readString();
     96                 return info;
     97             }
     98 
     99             public InterfaceConfiguration[] newArray(int size) {
    100                 return new InterfaceConfiguration[size];
    101             }
    102         };
    103 }
    104