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