The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 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 java.net.InetAddress; |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 20 | import java.net.Inet4Address; |
| 21 | import java.net.Inet6Address; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 22 | import java.net.UnknownHostException; |
| 23 | |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 24 | import android.util.Log; |
| 25 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 26 | /** |
| 27 | * Native methods for managing network interfaces. |
| 28 | * |
| 29 | * {@hide} |
| 30 | */ |
| 31 | public class NetworkUtils { |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 32 | |
| 33 | private static final String TAG = "NetworkUtils"; |
| 34 | |
Mike Lockwood | 0900f36 | 2009-07-10 17:24:07 -0400 | [diff] [blame] | 35 | /** Bring the named network interface up. */ |
| 36 | public native static int enableInterface(String interfaceName); |
| 37 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 38 | /** Bring the named network interface down. */ |
| 39 | public native static int disableInterface(String interfaceName); |
| 40 | |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 41 | /** |
| 42 | * Add a route to the routing table. |
| 43 | * |
| 44 | * @param interfaceName the interface to route through. |
| 45 | * @param dst the network or host to route to. May be IPv4 or IPv6, e.g. |
| 46 | * "0.0.0.0" or "2001:4860::". |
| 47 | * @param prefixLength the prefix length of the route. |
| 48 | * @param gw the gateway to use, e.g., "192.168.251.1". If null, |
| 49 | * indicates a directly-connected route. |
| 50 | */ |
| 51 | public native static int addRoute(String interfaceName, String dst, |
| 52 | int prefixLength, String gw); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 53 | |
| 54 | /** Return the gateway address for the default route for the named interface. */ |
Robert Greenwalt | 47f69fe | 2010-06-15 15:43:39 -0700 | [diff] [blame] | 55 | public static InetAddress getDefaultRoute(String interfaceName) { |
| 56 | int addr = getDefaultRouteNative(interfaceName); |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 57 | return intToInetAddress(addr); |
Robert Greenwalt | 47f69fe | 2010-06-15 15:43:39 -0700 | [diff] [blame] | 58 | } |
| 59 | private native static int getDefaultRouteNative(String interfaceName); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 60 | |
| 61 | /** Remove host routes that uses the named interface. */ |
| 62 | public native static int removeHostRoutes(String interfaceName); |
| 63 | |
| 64 | /** Remove the default route for the named interface. */ |
| 65 | public native static int removeDefaultRoute(String interfaceName); |
| 66 | |
| 67 | /** Reset any sockets that are connected via the named interface. */ |
| 68 | public native static int resetConnections(String interfaceName); |
| 69 | |
| 70 | /** |
| 71 | * Start the DHCP client daemon, in order to have it request addresses |
| 72 | * for the named interface, and then configure the interface with those |
| 73 | * addresses. This call blocks until it obtains a result (either success |
| 74 | * or failure) from the daemon. |
| 75 | * @param interfaceName the name of the interface to configure |
| 76 | * @param ipInfo if the request succeeds, this object is filled in with |
| 77 | * the IP address information. |
| 78 | * @return {@code true} for success, {@code false} for failure |
| 79 | */ |
Robert Greenwalt | 0216e61 | 2011-01-14 16:29:58 -0800 | [diff] [blame] | 80 | public native static boolean runDhcp(String interfaceName, DhcpInfoInternal ipInfo); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 81 | |
| 82 | /** |
| 83 | * Shut down the DHCP client daemon. |
| 84 | * @param interfaceName the name of the interface for which the daemon |
| 85 | * should be stopped |
| 86 | * @return {@code true} for success, {@code false} for failure |
| 87 | */ |
| 88 | public native static boolean stopDhcp(String interfaceName); |
| 89 | |
| 90 | /** |
| 91 | * Release the current DHCP lease. |
| 92 | * @param interfaceName the name of the interface for which the lease should |
| 93 | * be released |
| 94 | * @return {@code true} for success, {@code false} for failure |
| 95 | */ |
| 96 | public native static boolean releaseDhcpLease(String interfaceName); |
| 97 | |
| 98 | /** |
| 99 | * Return the last DHCP-related error message that was recorded. |
| 100 | * <p/>NOTE: This string is not localized, but currently it is only |
| 101 | * used in logging. |
| 102 | * @return the most recent error message, if any |
| 103 | */ |
| 104 | public native static String getDhcpError(); |
| 105 | |
| 106 | /** |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 107 | * Convert a IPv4 address from an integer to an InetAddress. |
Jesse Wilson | 07481cc | 2011-01-06 17:18:23 -0800 | [diff] [blame] | 108 | * @param hostAddress an int corresponding to the IPv4 address in network byte order |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 109 | */ |
| 110 | public static InetAddress intToInetAddress(int hostAddress) { |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 111 | byte[] addressBytes = { (byte)(0xff & hostAddress), |
| 112 | (byte)(0xff & (hostAddress >> 8)), |
| 113 | (byte)(0xff & (hostAddress >> 16)), |
| 114 | (byte)(0xff & (hostAddress >> 24)) }; |
| 115 | |
| 116 | try { |
Jesse Wilson | 07481cc | 2011-01-06 17:18:23 -0800 | [diff] [blame] | 117 | return InetAddress.getByAddress(addressBytes); |
| 118 | } catch (UnknownHostException e) { |
| 119 | throw new AssertionError(); |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 120 | } |
Robert Greenwalt | 47f69fe | 2010-06-15 15:43:39 -0700 | [diff] [blame] | 121 | } |
| 122 | |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 123 | /** |
Irfan Sheriff | 96ca917 | 2010-10-05 16:12:25 -0700 | [diff] [blame] | 124 | * Convert a IPv4 address from an InetAddress to an integer |
| 125 | * @param inetAddr is an InetAddress corresponding to the IPv4 address |
| 126 | * @return the IP address as an integer in network byte order |
| 127 | */ |
| 128 | public static int inetAddressToInt(InetAddress inetAddr) |
| 129 | throws IllegalArgumentException { |
| 130 | byte [] addr = inetAddr.getAddress(); |
| 131 | if (addr.length != 4) { |
| 132 | throw new IllegalArgumentException("Not an IPv4 address"); |
| 133 | } |
| 134 | return ((addr[3] & 0xff) << 24) | ((addr[2] & 0xff) << 16) | |
| 135 | ((addr[1] & 0xff) << 8) | (addr[0] & 0xff); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Convert a network prefix length to an IPv4 netmask integer |
| 140 | * @param prefixLength |
| 141 | * @return the IPv4 netmask as an integer in network byte order |
| 142 | */ |
| 143 | public static int prefixLengthToNetmaskInt(int prefixLength) |
| 144 | throws IllegalArgumentException { |
| 145 | if (prefixLength < 0 || prefixLength > 32) { |
| 146 | throw new IllegalArgumentException("Invalid prefix length (0 <= prefix <= 32)"); |
| 147 | } |
| 148 | int value = 0xffffffff << (32 - prefixLength); |
| 149 | return Integer.reverseBytes(value); |
| 150 | } |
| 151 | |
Irfan Sheriff | 96ca917 | 2010-10-05 16:12:25 -0700 | [diff] [blame] | 152 | /** |
Robert Greenwalt | 0216e61 | 2011-01-14 16:29:58 -0800 | [diff] [blame] | 153 | * Create an InetAddress from a string where the string must be a standard |
| 154 | * representation of a V4 or V6 address. Avoids doing a DNS lookup on failure |
| 155 | * but it will throw an IllegalArgumentException in that case. |
| 156 | * @param addrString |
| 157 | * @return the InetAddress |
| 158 | * @hide |
| 159 | */ |
| 160 | public static InetAddress numericToInetAddress(String addrString) |
| 161 | throws IllegalArgumentException { |
Elliott Hughes | f5bbb57 | 2011-02-15 17:11:29 -0800 | [diff] [blame^] | 162 | return InetAddress.parseNumericAddress(addrString); |
Robert Greenwalt | 0216e61 | 2011-01-14 16:29:58 -0800 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | /** |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 166 | * Add a default route through the specified gateway. |
| 167 | * @param interfaceName interface on which the route should be added |
| 168 | * @param gw the IP address of the gateway to which the route is desired, |
| 169 | * @return {@code true} on success, {@code false} on failure |
| 170 | */ |
| 171 | public static boolean addDefaultRoute(String interfaceName, InetAddress gw) { |
| 172 | String dstStr; |
| 173 | String gwStr = gw.getHostAddress(); |
| 174 | |
| 175 | if (gw instanceof Inet4Address) { |
| 176 | dstStr = "0.0.0.0"; |
| 177 | } else if (gw instanceof Inet6Address) { |
| 178 | dstStr = "::"; |
| 179 | } else { |
| 180 | Log.w(TAG, "addDefaultRoute failure: address is neither IPv4 nor IPv6" + |
| 181 | "(" + gwStr + ")"); |
| 182 | return false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 183 | } |
Robert Greenwalt | 585ac0f | 2010-08-27 09:24:29 -0700 | [diff] [blame] | 184 | return addRoute(interfaceName, dstStr, 0, gwStr) == 0; |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Add a host route. |
| 189 | * @param interfaceName interface on which the route should be added |
| 190 | * @param dst the IP address of the host to which the route is desired, |
| 191 | * this should not be null. |
| 192 | * @param gw the IP address of the gateway to which the route is desired, |
| 193 | * if null, indicates a directly-connected route. |
| 194 | * @return {@code true} on success, {@code false} on failure |
| 195 | */ |
| 196 | public static boolean addHostRoute(String interfaceName, InetAddress dst, |
| 197 | InetAddress gw) { |
| 198 | if (dst == null) { |
| 199 | Log.w(TAG, "addHostRoute: dst should not be null"); |
| 200 | return false; |
| 201 | } |
| 202 | |
| 203 | int prefixLength; |
| 204 | String dstStr = dst.getHostAddress(); |
| 205 | String gwStr = (gw != null) ? gw.getHostAddress() : null; |
| 206 | |
| 207 | if (dst instanceof Inet4Address) { |
| 208 | prefixLength = 32; |
| 209 | } else if (dst instanceof Inet6Address) { |
| 210 | prefixLength = 128; |
| 211 | } else { |
| 212 | Log.w(TAG, "addHostRoute failure: address is neither IPv4 nor IPv6" + |
| 213 | "(" + dst + ")"); |
| 214 | return false; |
| 215 | } |
| 216 | return addRoute(interfaceName, dstStr, prefixLength, gwStr) == 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 217 | } |
| 218 | } |