Home | History | Annotate | Download | only in net 
      1 /*
      2  * Copyright (C) 2010 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.text.TextUtils;
     20 import android.util.Log;
     21 
     22 import java.net.Inet4Address;
     23 import java.net.InetAddress;
     24 import java.util.ArrayList;
     25 import java.util.Collection;
     26 import java.util.Collections;
     27 
     28 /**
     29  * A simple object for retrieving the results of a DHCP request.
     30  * Replaces (internally) the IPv4-only DhcpInfo class.
     31  * @hide
     32  */
     33 public class DhcpInfoInternal {
     34     private final static String TAG = "DhcpInfoInternal";
     35     public String ipAddress;
     36     public int prefixLength;
     37 
     38     public String dns1;
     39     public String dns2;
     40 
     41     public String serverAddress;
     42     public int leaseDuration;
     43 
     44     /**
     45      * Vendor specific information (from RFC 2132).
     46      */
     47     public String vendorInfo;
     48 
     49     private Collection<RouteInfo> mRoutes;
     50 
     51     public DhcpInfoInternal() {
     52         mRoutes = new ArrayList<RouteInfo>();
     53     }
     54 
     55     public void addRoute(RouteInfo routeInfo) {
     56         mRoutes.add(routeInfo);
     57     }
     58 
     59     public Collection<RouteInfo> getRoutes() {
     60         return Collections.unmodifiableCollection(mRoutes);
     61     }
     62 
     63     private int convertToInt(String addr) {
     64         if (addr != null) {
     65             try {
     66                 InetAddress inetAddress = NetworkUtils.numericToInetAddress(addr);
     67                 if (inetAddress instanceof Inet4Address) {
     68                     return NetworkUtils.inetAddressToInt(inetAddress);
     69                 }
     70             } catch (IllegalArgumentException e) {}
     71         }
     72         return 0;
     73     }
     74 
     75     public DhcpInfo makeDhcpInfo() {
     76         DhcpInfo info = new DhcpInfo();
     77         info.ipAddress = convertToInt(ipAddress);
     78         for (RouteInfo route : mRoutes) {
     79             if (route.isDefaultRoute()) {
     80                 info.gateway = convertToInt(route.getGateway().getHostAddress());
     81                 break;
     82             }
     83         }
     84         try {
     85             InetAddress inetAddress = NetworkUtils.numericToInetAddress(ipAddress);
     86             info.netmask = NetworkUtils.prefixLengthToNetmaskInt(prefixLength);
     87         } catch (IllegalArgumentException e) {}
     88         info.dns1 = convertToInt(dns1);
     89         info.dns2 = convertToInt(dns2);
     90         info.serverAddress = convertToInt(serverAddress);
     91         info.leaseDuration = leaseDuration;
     92         return info;
     93     }
     94 
     95     public LinkAddress makeLinkAddress() {
     96         if (TextUtils.isEmpty(ipAddress)) {
     97             Log.e(TAG, "makeLinkAddress with empty ipAddress");
     98             return null;
     99         }
    100         return new LinkAddress(NetworkUtils.numericToInetAddress(ipAddress), prefixLength);
    101     }
    102 
    103     public LinkProperties makeLinkProperties() {
    104         LinkProperties p = new LinkProperties();
    105         p.addLinkAddress(makeLinkAddress());
    106         for (RouteInfo route : mRoutes) {
    107             p.addRoute(route);
    108         }
    109         //if empty, connectivity configures default DNS
    110         if (TextUtils.isEmpty(dns1) == false) {
    111             p.addDns(NetworkUtils.numericToInetAddress(dns1));
    112         } else {
    113             Log.d(TAG, "makeLinkProperties with empty dns1!");
    114         }
    115         if (TextUtils.isEmpty(dns2) == false) {
    116             p.addDns(NetworkUtils.numericToInetAddress(dns2));
    117         } else {
    118             Log.d(TAG, "makeLinkProperties with empty dns2!");
    119         }
    120         return p;
    121     }
    122 
    123     /* Updates the DHCP fields that need to be retained from
    124      * original DHCP request if the DHCP renewal shows them as
    125      * being empty
    126      */
    127     public void updateFromDhcpRequest(DhcpInfoInternal orig) {
    128         if (orig == null) return;
    129 
    130         if (TextUtils.isEmpty(dns1)) {
    131             dns1 = orig.dns1;
    132         }
    133 
    134         if (TextUtils.isEmpty(dns2)) {
    135             dns2 = orig.dns2;
    136         }
    137 
    138         if (mRoutes.size() == 0) {
    139             for (RouteInfo route : orig.getRoutes()) {
    140                 addRoute(route);
    141             }
    142         }
    143     }
    144 
    145     /**
    146      * Test if this DHCP lease includes vendor hint that network link is
    147      * metered, and sensitive to heavy data transfers.
    148      */
    149     public boolean hasMeteredHint() {
    150         if (vendorInfo != null) {
    151             return vendorInfo.contains("ANDROID_METERED");
    152         } else {
    153             return false;
    154         }
    155     }
    156 
    157     public String toString() {
    158         String routeString = "";
    159         for (RouteInfo route : mRoutes) routeString += route.toString() + " | ";
    160         return "addr: " + ipAddress + "/" + prefixLength +
    161                 " mRoutes: " + routeString +
    162                 " dns: " + dns1 + "," + dns2 +
    163                 " dhcpServer: " + serverAddress +
    164                 " leaseDuration: " + leaseDuration;
    165     }
    166 }
    167