Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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.dhcp; |
| 18 | |
Remi NGUYEN VAN | 7b84fb3 | 2019-01-19 21:13:24 +0900 | [diff] [blame] | 19 | import static android.net.dhcp.DhcpPacket.DHCP_BROADCAST_ADDRESS; |
| 20 | import static android.net.dhcp.DhcpPacket.DHCP_DNS_SERVER; |
| 21 | import static android.net.dhcp.DhcpPacket.DHCP_DOMAIN_NAME; |
| 22 | import static android.net.dhcp.DhcpPacket.DHCP_LEASE_TIME; |
| 23 | import static android.net.dhcp.DhcpPacket.DHCP_MTU; |
| 24 | import static android.net.dhcp.DhcpPacket.DHCP_REBINDING_TIME; |
| 25 | import static android.net.dhcp.DhcpPacket.DHCP_RENEWAL_TIME; |
| 26 | import static android.net.dhcp.DhcpPacket.DHCP_ROUTER; |
| 27 | import static android.net.dhcp.DhcpPacket.DHCP_SUBNET_MASK; |
| 28 | import static android.net.dhcp.DhcpPacket.DHCP_VENDOR_INFO; |
| 29 | import static android.net.dhcp.DhcpPacket.INADDR_ANY; |
| 30 | import static android.net.dhcp.DhcpPacket.INADDR_BROADCAST; |
Remi NGUYEN VAN | 231b52b | 2019-01-29 15:38:52 +0900 | [diff] [blame] | 31 | import static android.net.util.NetworkStackUtils.closeSocketQuietly; |
Remi NGUYEN VAN | 811f638 | 2019-01-20 12:08:21 +0900 | [diff] [blame] | 32 | import static android.net.util.SocketUtils.makePacketSocketAddress; |
Remi NGUYEN VAN | 7b84fb3 | 2019-01-19 21:13:24 +0900 | [diff] [blame] | 33 | import static android.system.OsConstants.AF_INET; |
| 34 | import static android.system.OsConstants.AF_PACKET; |
| 35 | import static android.system.OsConstants.ETH_P_IP; |
| 36 | import static android.system.OsConstants.IPPROTO_UDP; |
| 37 | import static android.system.OsConstants.SOCK_DGRAM; |
| 38 | import static android.system.OsConstants.SOCK_RAW; |
| 39 | import static android.system.OsConstants.SOL_SOCKET; |
Remi NGUYEN VAN | 7b84fb3 | 2019-01-19 21:13:24 +0900 | [diff] [blame] | 40 | import static android.system.OsConstants.SO_BROADCAST; |
| 41 | import static android.system.OsConstants.SO_RCVBUF; |
| 42 | import static android.system.OsConstants.SO_REUSEADDR; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 43 | |
Remi NGUYEN VAN | 3ba6c0d | 2019-01-20 13:48:19 +0900 | [diff] [blame] | 44 | import static com.android.server.util.NetworkStackConstants.IPV4_ADDR_ANY; |
| 45 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 46 | import android.content.Context; |
Erik Kline | 29a2152 | 2016-02-17 21:44:25 +0900 | [diff] [blame] | 47 | import android.net.DhcpResults; |
Jeff Sharkey | 619a511 | 2017-01-19 11:55:54 -0700 | [diff] [blame] | 48 | import android.net.TrafficStats; |
Remi NGUYEN VAN | c1c02dc | 2019-01-20 16:50:42 +0900 | [diff] [blame] | 49 | import android.net.ip.IpClient; |
Pierre Imai | 55618be | 2016-02-19 15:25:54 +0900 | [diff] [blame] | 50 | import android.net.metrics.DhcpClientEvent; |
Hugo Benichi | 2677b19 | 2016-04-18 09:04:04 +0900 | [diff] [blame] | 51 | import android.net.metrics.DhcpErrorEvent; |
Remi NGUYEN VAN | 7b84fb3 | 2019-01-19 21:13:24 +0900 | [diff] [blame] | 52 | import android.net.metrics.IpConnectivityLog; |
Erik Kline | 8bd00d5 | 2017-12-08 17:47:50 +0900 | [diff] [blame] | 53 | import android.net.util.InterfaceParams; |
Remi NGUYEN VAN | 811f638 | 2019-01-20 12:08:21 +0900 | [diff] [blame] | 54 | import android.net.util.SocketUtils; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 55 | import android.os.Message; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 56 | import android.os.SystemClock; |
| 57 | import android.system.ErrnoException; |
| 58 | import android.system.Os; |
Hugo Benichi | a028989 | 2016-10-18 13:09:04 +0900 | [diff] [blame] | 59 | import android.util.EventLog; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 60 | import android.util.Log; |
Lorenzo Colitti | d2457a3 | 2016-02-18 00:32:44 +0900 | [diff] [blame] | 61 | import android.util.SparseArray; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 62 | |
Remi NGUYEN VAN | 7b84fb3 | 2019-01-19 21:13:24 +0900 | [diff] [blame] | 63 | import com.android.internal.util.HexDump; |
| 64 | import com.android.internal.util.MessageUtils; |
Remi NGUYEN VAN | 7b84fb3 | 2019-01-19 21:13:24 +0900 | [diff] [blame] | 65 | import com.android.internal.util.State; |
| 66 | import com.android.internal.util.StateMachine; |
| 67 | import com.android.internal.util.WakeupMessage; |
| 68 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 69 | import java.io.FileDescriptor; |
| 70 | import java.io.IOException; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 71 | import java.net.Inet4Address; |
Remi NGUYEN VAN | 811f638 | 2019-01-20 12:08:21 +0900 | [diff] [blame] | 72 | import java.net.SocketAddress; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 73 | import java.net.SocketException; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 74 | import java.nio.ByteBuffer; |
| 75 | import java.util.Arrays; |
| 76 | import java.util.Random; |
| 77 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 78 | /** |
| 79 | * A DHCPv4 client. |
| 80 | * |
| 81 | * Written to behave similarly to the DhcpStateMachine + dhcpcd 5.5.6 combination used in Android |
| 82 | * 5.1 and below, as configured on Nexus 6. The interface is the same as DhcpStateMachine. |
| 83 | * |
| 84 | * TODO: |
| 85 | * |
| 86 | * - Exponential backoff when receiving NAKs (not specified by the RFC, but current behaviour). |
| 87 | * - Support persisting lease state and support INIT-REBOOT. Android 5.1 does this, but it does not |
| 88 | * do so correctly: instead of requesting the lease last obtained on a particular network (e.g., a |
| 89 | * given SSID), it requests the last-leased IP address on the same interface, causing a delay if |
| 90 | * the server NAKs or a timeout if it doesn't. |
| 91 | * |
| 92 | * Known differences from current behaviour: |
| 93 | * |
| 94 | * - Does not request the "static routes" option. |
| 95 | * - Does not support BOOTP servers. DHCP has been around since 1993, should be everywhere now. |
| 96 | * - Requests the "broadcast" option, but does nothing with it. |
| 97 | * - Rejects invalid subnet masks such as 255.255.255.1 (current code treats that as 255.255.255.0). |
| 98 | * |
| 99 | * @hide |
| 100 | */ |
Erik Kline | efa4209 | 2016-02-18 12:40:11 +0900 | [diff] [blame] | 101 | public class DhcpClient extends StateMachine { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 102 | |
| 103 | private static final String TAG = "DhcpClient"; |
Lorenzo Colitti | e67ec4e | 2016-05-27 13:59:57 +0900 | [diff] [blame] | 104 | private static final boolean DBG = true; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 105 | private static final boolean STATE_DBG = false; |
| 106 | private static final boolean MSG_DBG = false; |
Joe Onorato | f188d41 | 2016-02-01 17:49:10 -0800 | [diff] [blame] | 107 | private static final boolean PACKET_DBG = false; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 108 | |
Remi NGUYEN VAN | 231b52b | 2019-01-29 15:38:52 +0900 | [diff] [blame] | 109 | // Metrics events: must be kept in sync with server-side aggregation code. |
| 110 | /** Represents transitions from DhcpInitState to DhcpBoundState */ |
| 111 | private static final String EVENT_INITIAL_BOUND = "InitialBoundState"; |
| 112 | /** Represents transitions from and to DhcpBoundState via DhcpRenewingState */ |
| 113 | private static final String EVENT_RENEWING_BOUND = "RenewingBoundState"; |
| 114 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 115 | // Timers and timeouts. |
| 116 | private static final int SECONDS = 1000; |
| 117 | private static final int FIRST_TIMEOUT_MS = 2 * SECONDS; |
| 118 | private static final int MAX_TIMEOUT_MS = 128 * SECONDS; |
| 119 | |
| 120 | // This is not strictly needed, since the client is asynchronous and implements exponential |
| 121 | // backoff. It's maintained for backwards compatibility with the previous DHCP code, which was |
| 122 | // a blocking operation with a 30-second timeout. We pick 36 seconds so we can send packets at |
| 123 | // t=0, t=2, t=6, t=14, t=30, allowing for 10% jitter. |
| 124 | private static final int DHCP_TIMEOUT_MS = 36 * SECONDS; |
| 125 | |
Remi NGUYEN VAN | c1c02dc | 2019-01-20 16:50:42 +0900 | [diff] [blame] | 126 | // DhcpClient uses IpClient's handler. |
| 127 | private static final int PUBLIC_BASE = IpClient.DHCPCLIENT_CMD_BASE; |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 128 | |
| 129 | /* Commands from controller to start/stop DHCP */ |
| 130 | public static final int CMD_START_DHCP = PUBLIC_BASE + 1; |
| 131 | public static final int CMD_STOP_DHCP = PUBLIC_BASE + 2; |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 132 | |
| 133 | /* Notification from DHCP state machine prior to DHCP discovery/renewal */ |
Erik Kline | 741b15d | 2016-04-26 11:48:09 +0900 | [diff] [blame] | 134 | public static final int CMD_PRE_DHCP_ACTION = PUBLIC_BASE + 3; |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 135 | /* Notification from DHCP state machine post DHCP discovery/renewal. Indicates |
| 136 | * success/failure */ |
Erik Kline | 741b15d | 2016-04-26 11:48:09 +0900 | [diff] [blame] | 137 | public static final int CMD_POST_DHCP_ACTION = PUBLIC_BASE + 4; |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 138 | /* Notification from DHCP state machine before quitting */ |
Erik Kline | 741b15d | 2016-04-26 11:48:09 +0900 | [diff] [blame] | 139 | public static final int CMD_ON_QUIT = PUBLIC_BASE + 5; |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 140 | |
| 141 | /* Command from controller to indicate DHCP discovery/renewal can continue |
| 142 | * after pre DHCP action is complete */ |
Erik Kline | 741b15d | 2016-04-26 11:48:09 +0900 | [diff] [blame] | 143 | public static final int CMD_PRE_DHCP_ACTION_COMPLETE = PUBLIC_BASE + 6; |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 144 | |
Erik Kline | 5b76623 | 2016-04-06 11:18:10 +0900 | [diff] [blame] | 145 | /* Command and event notification to/from IpManager requesting the setting |
| 146 | * (or clearing) of an IPv4 LinkAddress. |
| 147 | */ |
Erik Kline | 741b15d | 2016-04-26 11:48:09 +0900 | [diff] [blame] | 148 | public static final int CMD_CLEAR_LINKADDRESS = PUBLIC_BASE + 7; |
| 149 | public static final int CMD_CONFIGURE_LINKADDRESS = PUBLIC_BASE + 8; |
| 150 | public static final int EVENT_LINKADDRESS_CONFIGURED = PUBLIC_BASE + 9; |
Erik Kline | 5b76623 | 2016-04-06 11:18:10 +0900 | [diff] [blame] | 151 | |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 152 | /* Message.arg1 arguments to CMD_POST_DHCP_ACTION notification */ |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 153 | public static final int DHCP_SUCCESS = 1; |
| 154 | public static final int DHCP_FAILURE = 2; |
| 155 | |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 156 | // Internal messages. |
Remi NGUYEN VAN | c1c02dc | 2019-01-20 16:50:42 +0900 | [diff] [blame] | 157 | private static final int PRIVATE_BASE = IpClient.DHCPCLIENT_CMD_BASE + 100; |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 158 | private static final int CMD_KICK = PRIVATE_BASE + 1; |
| 159 | private static final int CMD_RECEIVED_PACKET = PRIVATE_BASE + 2; |
| 160 | private static final int CMD_TIMEOUT = PRIVATE_BASE + 3; |
Erik Kline | 741b15d | 2016-04-26 11:48:09 +0900 | [diff] [blame] | 161 | private static final int CMD_RENEW_DHCP = PRIVATE_BASE + 4; |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 162 | private static final int CMD_REBIND_DHCP = PRIVATE_BASE + 5; |
| 163 | private static final int CMD_EXPIRE_DHCP = PRIVATE_BASE + 6; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 164 | |
Lorenzo Colitti | d2457a3 | 2016-02-18 00:32:44 +0900 | [diff] [blame] | 165 | // For message logging. |
| 166 | private static final Class[] sMessageClasses = { DhcpClient.class }; |
| 167 | private static final SparseArray<String> sMessageNames = |
| 168 | MessageUtils.findMessageNames(sMessageClasses); |
| 169 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 170 | // DHCP parameters that we request. |
Erik Kline | 1d511ab | 2016-03-24 17:30:13 +0900 | [diff] [blame] | 171 | /* package */ static final byte[] REQUESTED_PARAMS = new byte[] { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 172 | DHCP_SUBNET_MASK, |
| 173 | DHCP_ROUTER, |
| 174 | DHCP_DNS_SERVER, |
| 175 | DHCP_DOMAIN_NAME, |
| 176 | DHCP_MTU, |
| 177 | DHCP_BROADCAST_ADDRESS, // TODO: currently ignored. |
| 178 | DHCP_LEASE_TIME, |
| 179 | DHCP_RENEWAL_TIME, |
| 180 | DHCP_REBINDING_TIME, |
Erik Kline | 1d511ab | 2016-03-24 17:30:13 +0900 | [diff] [blame] | 181 | DHCP_VENDOR_INFO, |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 182 | }; |
| 183 | |
| 184 | // DHCP flag that means "yes, we support unicast." |
| 185 | private static final boolean DO_UNICAST = false; |
| 186 | |
| 187 | // System services / libraries we use. |
| 188 | private final Context mContext; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 189 | private final Random mRandom; |
Hugo Benichi | cfddd68 | 2016-05-31 16:28:06 +0900 | [diff] [blame] | 190 | private final IpConnectivityLog mMetricsLog = new IpConnectivityLog(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 191 | |
| 192 | // Sockets. |
| 193 | // - We use a packet socket to receive, because servers send us packets bound for IP addresses |
| 194 | // which we have not yet configured, and the kernel protocol stack drops these. |
| 195 | // - We use a UDP socket to send, so the kernel handles ARP and routing for us (DHCP servers can |
| 196 | // be off-link as well as on-link). |
| 197 | private FileDescriptor mPacketSock; |
| 198 | private FileDescriptor mUdpSock; |
| 199 | private ReceiveThread mReceiveThread; |
| 200 | |
| 201 | // State variables. |
| 202 | private final StateMachine mController; |
Lorenzo Colitti | 9d3aadb | 2015-12-02 17:51:28 +0900 | [diff] [blame] | 203 | private final WakeupMessage mKickAlarm; |
| 204 | private final WakeupMessage mTimeoutAlarm; |
| 205 | private final WakeupMessage mRenewAlarm; |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 206 | private final WakeupMessage mRebindAlarm; |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 207 | private final WakeupMessage mExpiryAlarm; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 208 | private final String mIfaceName; |
| 209 | |
| 210 | private boolean mRegisteredForPreDhcpNotification; |
Erik Kline | 8bd00d5 | 2017-12-08 17:47:50 +0900 | [diff] [blame] | 211 | private InterfaceParams mIface; |
| 212 | // TODO: MacAddress-ify more of this class hierarchy. |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 213 | private byte[] mHwAddr; |
Remi NGUYEN VAN | 811f638 | 2019-01-20 12:08:21 +0900 | [diff] [blame] | 214 | private SocketAddress mInterfaceBroadcastAddr; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 215 | private int mTransactionId; |
Lorenzo Colitti | 3e97932 | 2015-04-21 15:22:17 +0900 | [diff] [blame] | 216 | private long mTransactionStartMillis; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 217 | private DhcpResults mDhcpLease; |
| 218 | private long mDhcpLeaseExpiry; |
| 219 | private DhcpResults mOffer; |
| 220 | |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 221 | // Milliseconds SystemClock timestamps used to record transition times to DhcpBoundState. |
| 222 | private long mLastInitEnterTime; |
| 223 | private long mLastBoundExitTime; |
| 224 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 225 | // States. |
| 226 | private State mStoppedState = new StoppedState(); |
| 227 | private State mDhcpState = new DhcpState(); |
| 228 | private State mDhcpInitState = new DhcpInitState(); |
| 229 | private State mDhcpSelectingState = new DhcpSelectingState(); |
| 230 | private State mDhcpRequestingState = new DhcpRequestingState(); |
Erik Kline | 5b76623 | 2016-04-06 11:18:10 +0900 | [diff] [blame] | 231 | private State mDhcpHaveLeaseState = new DhcpHaveLeaseState(); |
| 232 | private State mConfiguringInterfaceState = new ConfiguringInterfaceState(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 233 | private State mDhcpBoundState = new DhcpBoundState(); |
| 234 | private State mDhcpRenewingState = new DhcpRenewingState(); |
| 235 | private State mDhcpRebindingState = new DhcpRebindingState(); |
| 236 | private State mDhcpInitRebootState = new DhcpInitRebootState(); |
| 237 | private State mDhcpRebootingState = new DhcpRebootingState(); |
| 238 | private State mWaitBeforeStartState = new WaitBeforeStartState(mDhcpInitState); |
| 239 | private State mWaitBeforeRenewalState = new WaitBeforeRenewalState(mDhcpRenewingState); |
| 240 | |
Lorenzo Colitti | 9d3aadb | 2015-12-02 17:51:28 +0900 | [diff] [blame] | 241 | private WakeupMessage makeWakeupMessage(String cmdName, int cmd) { |
| 242 | cmdName = DhcpClient.class.getSimpleName() + "." + mIfaceName + "." + cmdName; |
| 243 | return new WakeupMessage(mContext, getHandler(), cmdName, cmd); |
| 244 | } |
| 245 | |
Erik Kline | 8bd00d5 | 2017-12-08 17:47:50 +0900 | [diff] [blame] | 246 | // TODO: Take an InterfaceParams instance instead of an interface name String. |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 247 | private DhcpClient(Context context, StateMachine controller, String iface) { |
Erik Kline | be83aeb | 2017-06-09 19:20:26 +0900 | [diff] [blame] | 248 | super(TAG, controller.getHandler()); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 249 | |
| 250 | mContext = context; |
| 251 | mController = controller; |
| 252 | mIfaceName = iface; |
| 253 | |
| 254 | addState(mStoppedState); |
| 255 | addState(mDhcpState); |
| 256 | addState(mDhcpInitState, mDhcpState); |
| 257 | addState(mWaitBeforeStartState, mDhcpState); |
| 258 | addState(mDhcpSelectingState, mDhcpState); |
| 259 | addState(mDhcpRequestingState, mDhcpState); |
Erik Kline | 5b76623 | 2016-04-06 11:18:10 +0900 | [diff] [blame] | 260 | addState(mDhcpHaveLeaseState, mDhcpState); |
| 261 | addState(mConfiguringInterfaceState, mDhcpHaveLeaseState); |
| 262 | addState(mDhcpBoundState, mDhcpHaveLeaseState); |
| 263 | addState(mWaitBeforeRenewalState, mDhcpHaveLeaseState); |
| 264 | addState(mDhcpRenewingState, mDhcpHaveLeaseState); |
| 265 | addState(mDhcpRebindingState, mDhcpHaveLeaseState); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 266 | addState(mDhcpInitRebootState, mDhcpState); |
| 267 | addState(mDhcpRebootingState, mDhcpState); |
| 268 | |
| 269 | setInitialState(mStoppedState); |
| 270 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 271 | mRandom = new Random(); |
| 272 | |
Lorenzo Colitti | 5bc64b8 | 2015-06-04 17:52:55 +0900 | [diff] [blame] | 273 | // Used to schedule packet retransmissions. |
Lorenzo Colitti | 9d3aadb | 2015-12-02 17:51:28 +0900 | [diff] [blame] | 274 | mKickAlarm = makeWakeupMessage("KICK", CMD_KICK); |
Lorenzo Colitti | 5bc64b8 | 2015-06-04 17:52:55 +0900 | [diff] [blame] | 275 | // Used to time out PacketRetransmittingStates. |
Lorenzo Colitti | 9d3aadb | 2015-12-02 17:51:28 +0900 | [diff] [blame] | 276 | mTimeoutAlarm = makeWakeupMessage("TIMEOUT", CMD_TIMEOUT); |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 277 | // Used to schedule DHCP reacquisition. |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 278 | mRenewAlarm = makeWakeupMessage("RENEW", CMD_RENEW_DHCP); |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 279 | mRebindAlarm = makeWakeupMessage("REBIND", CMD_REBIND_DHCP); |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 280 | mExpiryAlarm = makeWakeupMessage("EXPIRY", CMD_EXPIRE_DHCP); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 281 | } |
| 282 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 283 | public void registerForPreDhcpNotification() { |
| 284 | mRegisteredForPreDhcpNotification = true; |
| 285 | } |
| 286 | |
Erik Kline | 29a2152 | 2016-02-17 21:44:25 +0900 | [diff] [blame] | 287 | public static DhcpClient makeDhcpClient( |
Erik Kline | 8bd00d5 | 2017-12-08 17:47:50 +0900 | [diff] [blame] | 288 | Context context, StateMachine controller, InterfaceParams ifParams) { |
| 289 | DhcpClient client = new DhcpClient(context, controller, ifParams.name); |
| 290 | client.mIface = ifParams; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 291 | client.start(); |
| 292 | return client; |
| 293 | } |
| 294 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 295 | private boolean initInterface() { |
Erik Kline | 8bd00d5 | 2017-12-08 17:47:50 +0900 | [diff] [blame] | 296 | if (mIface == null) mIface = InterfaceParams.getByName(mIfaceName); |
| 297 | if (mIface == null) { |
| 298 | Log.e(TAG, "Can't determine InterfaceParams for " + mIfaceName); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 299 | return false; |
| 300 | } |
Erik Kline | 8bd00d5 | 2017-12-08 17:47:50 +0900 | [diff] [blame] | 301 | |
| 302 | mHwAddr = mIface.macAddr.toByteArray(); |
Remi NGUYEN VAN | 811f638 | 2019-01-20 12:08:21 +0900 | [diff] [blame] | 303 | mInterfaceBroadcastAddr = makePacketSocketAddress(mIface.index, DhcpPacket.ETHER_BROADCAST); |
Erik Kline | 8bd00d5 | 2017-12-08 17:47:50 +0900 | [diff] [blame] | 304 | return true; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 305 | } |
| 306 | |
Lorenzo Colitti | 3e97932 | 2015-04-21 15:22:17 +0900 | [diff] [blame] | 307 | private void startNewTransaction() { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 308 | mTransactionId = mRandom.nextInt(); |
Lorenzo Colitti | 3e97932 | 2015-04-21 15:22:17 +0900 | [diff] [blame] | 309 | mTransactionStartMillis = SystemClock.elapsedRealtime(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | private boolean initSockets() { |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 313 | return initPacketSocket() && initUdpSocket(); |
| 314 | } |
| 315 | |
| 316 | private boolean initPacketSocket() { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 317 | try { |
| 318 | mPacketSock = Os.socket(AF_PACKET, SOCK_RAW, ETH_P_IP); |
Remi NGUYEN VAN | 811f638 | 2019-01-20 12:08:21 +0900 | [diff] [blame] | 319 | SocketAddress addr = makePacketSocketAddress((short) ETH_P_IP, mIface.index); |
Remi NGUYEN VAN | b7bda39 | 2019-03-06 18:02:34 +0900 | [diff] [blame] | 320 | Os.bind(mPacketSock, addr); |
Remi NGUYEN VAN | 231b52b | 2019-01-29 15:38:52 +0900 | [diff] [blame] | 321 | SocketUtils.attachDhcpFilter(mPacketSock); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 322 | } catch(SocketException|ErrnoException e) { |
| 323 | Log.e(TAG, "Error creating packet socket", e); |
| 324 | return false; |
| 325 | } |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 326 | return true; |
| 327 | } |
| 328 | |
| 329 | private boolean initUdpSocket() { |
Jeff Sharkey | 619a511 | 2017-01-19 11:55:54 -0700 | [diff] [blame] | 330 | final int oldTag = TrafficStats.getAndSetThreadStatsTag(TrafficStats.TAG_SYSTEM_DHCP); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 331 | try { |
| 332 | mUdpSock = Os.socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
Remi NGUYEN VAN | 811f638 | 2019-01-20 12:08:21 +0900 | [diff] [blame] | 333 | SocketUtils.bindSocketToInterface(mUdpSock, mIfaceName); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 334 | Os.setsockoptInt(mUdpSock, SOL_SOCKET, SO_REUSEADDR, 1); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 335 | Os.setsockoptInt(mUdpSock, SOL_SOCKET, SO_BROADCAST, 1); |
Lorenzo Colitti | 4e4d59e | 2015-09-10 18:12:18 +0900 | [diff] [blame] | 336 | Os.setsockoptInt(mUdpSock, SOL_SOCKET, SO_RCVBUF, 0); |
Remi NGUYEN VAN | 3ba6c0d | 2019-01-20 13:48:19 +0900 | [diff] [blame] | 337 | Os.bind(mUdpSock, IPV4_ADDR_ANY, DhcpPacket.DHCP_CLIENT); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 338 | } catch(SocketException|ErrnoException e) { |
| 339 | Log.e(TAG, "Error creating UDP socket", e); |
| 340 | return false; |
Jeff Sharkey | 619a511 | 2017-01-19 11:55:54 -0700 | [diff] [blame] | 341 | } finally { |
| 342 | TrafficStats.setThreadStatsTag(oldTag); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 343 | } |
| 344 | return true; |
| 345 | } |
| 346 | |
Lorenzo Colitti | 4e4d59e | 2015-09-10 18:12:18 +0900 | [diff] [blame] | 347 | private boolean connectUdpSock(Inet4Address to) { |
| 348 | try { |
| 349 | Os.connect(mUdpSock, to, DhcpPacket.DHCP_SERVER); |
| 350 | return true; |
| 351 | } catch (SocketException|ErrnoException e) { |
| 352 | Log.e(TAG, "Error connecting UDP socket", e); |
| 353 | return false; |
| 354 | } |
| 355 | } |
| 356 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 357 | private void closeSockets() { |
Remi NGUYEN VAN | 231b52b | 2019-01-29 15:38:52 +0900 | [diff] [blame] | 358 | closeSocketQuietly(mUdpSock); |
| 359 | closeSocketQuietly(mPacketSock); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 360 | } |
| 361 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 362 | class ReceiveThread extends Thread { |
| 363 | |
| 364 | private final byte[] mPacket = new byte[DhcpPacket.MAX_LENGTH]; |
Hugo Benichi | 67530d6 | 2016-04-13 10:15:39 +0900 | [diff] [blame] | 365 | private volatile boolean mStopped = false; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 366 | |
| 367 | public void halt() { |
Hugo Benichi | 67530d6 | 2016-04-13 10:15:39 +0900 | [diff] [blame] | 368 | mStopped = true; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 369 | closeSockets(); // Interrupts the read() call the thread is blocked in. |
| 370 | } |
| 371 | |
| 372 | @Override |
| 373 | public void run() { |
Joe Onorato | f188d41 | 2016-02-01 17:49:10 -0800 | [diff] [blame] | 374 | if (DBG) Log.d(TAG, "Receive thread started"); |
Hugo Benichi | 67530d6 | 2016-04-13 10:15:39 +0900 | [diff] [blame] | 375 | while (!mStopped) { |
Erik Kline | 496906e | 2015-09-16 15:44:54 +0900 | [diff] [blame] | 376 | int length = 0; // Or compiler can't tell it's initialized if a parse error occurs. |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 377 | try { |
Erik Kline | 496906e | 2015-09-16 15:44:54 +0900 | [diff] [blame] | 378 | length = Os.read(mPacketSock, mPacket, 0, mPacket.length); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 379 | DhcpPacket packet = null; |
| 380 | packet = DhcpPacket.decodeFullPacket(mPacket, length, DhcpPacket.ENCAP_L2); |
Joe Onorato | f188d41 | 2016-02-01 17:49:10 -0800 | [diff] [blame] | 381 | if (DBG) Log.d(TAG, "Received packet: " + packet); |
Erik Kline | 496906e | 2015-09-16 15:44:54 +0900 | [diff] [blame] | 382 | sendMessage(CMD_RECEIVED_PACKET, packet); |
Lorenzo Colitti | f5c1722 | 2015-03-31 07:04:42 +0900 | [diff] [blame] | 383 | } catch (IOException|ErrnoException e) { |
Hugo Benichi | 67530d6 | 2016-04-13 10:15:39 +0900 | [diff] [blame] | 384 | if (!mStopped) { |
Lorenzo Colitti | f5c1722 | 2015-03-31 07:04:42 +0900 | [diff] [blame] | 385 | Log.e(TAG, "Read error", e); |
Hugo Benichi | cfddd68 | 2016-05-31 16:28:06 +0900 | [diff] [blame] | 386 | logError(DhcpErrorEvent.RECEIVE_ERROR); |
Lorenzo Colitti | f5c1722 | 2015-03-31 07:04:42 +0900 | [diff] [blame] | 387 | } |
Erik Kline | 496906e | 2015-09-16 15:44:54 +0900 | [diff] [blame] | 388 | } catch (DhcpPacket.ParseException e) { |
| 389 | Log.e(TAG, "Can't parse packet: " + e.getMessage()); |
| 390 | if (PACKET_DBG) { |
| 391 | Log.d(TAG, HexDump.dumpHexString(mPacket, 0, length)); |
| 392 | } |
Hugo Benichi | a028989 | 2016-10-18 13:09:04 +0900 | [diff] [blame] | 393 | if (e.errorCode == DhcpErrorEvent.DHCP_NO_COOKIE) { |
| 394 | int snetTagId = 0x534e4554; |
| 395 | String bugId = "31850211"; |
| 396 | int uid = -1; |
| 397 | String data = DhcpPacket.ParseException.class.getName(); |
| 398 | EventLog.writeEvent(snetTagId, bugId, uid, data); |
| 399 | } |
Hugo Benichi | cfddd68 | 2016-05-31 16:28:06 +0900 | [diff] [blame] | 400 | logError(e.errorCode); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 401 | } |
| 402 | } |
Joe Onorato | f188d41 | 2016-02-01 17:49:10 -0800 | [diff] [blame] | 403 | if (DBG) Log.d(TAG, "Receive thread stopped"); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 404 | } |
| 405 | } |
| 406 | |
Lorenzo Colitti | 3e97932 | 2015-04-21 15:22:17 +0900 | [diff] [blame] | 407 | private short getSecs() { |
| 408 | return (short) ((SystemClock.elapsedRealtime() - mTransactionStartMillis) / 1000); |
| 409 | } |
| 410 | |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 411 | private boolean transmitPacket(ByteBuffer buf, String description, int encap, Inet4Address to) { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 412 | try { |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 413 | if (encap == DhcpPacket.ENCAP_L2) { |
Joe Onorato | f188d41 | 2016-02-01 17:49:10 -0800 | [diff] [blame] | 414 | if (DBG) Log.d(TAG, "Broadcasting " + description); |
Remi NGUYEN VAN | b7bda39 | 2019-03-06 18:02:34 +0900 | [diff] [blame] | 415 | Os.sendto(mPacketSock, buf.array(), 0, buf.limit(), 0, mInterfaceBroadcastAddr); |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 416 | } else if (encap == DhcpPacket.ENCAP_BOOTP && to.equals(INADDR_BROADCAST)) { |
| 417 | if (DBG) Log.d(TAG, "Broadcasting " + description); |
| 418 | // We only send L3-encapped broadcasts in DhcpRebindingState, |
| 419 | // where we have an IP address and an unconnected UDP socket. |
| 420 | // |
| 421 | // N.B.: We only need this codepath because DhcpRequestPacket |
| 422 | // hardcodes the source IP address to 0.0.0.0. We could reuse |
| 423 | // the packet socket if this ever changes. |
| 424 | Os.sendto(mUdpSock, buf, 0, to, DhcpPacket.DHCP_SERVER); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 425 | } else { |
Lorenzo Colitti | 4e4d59e | 2015-09-10 18:12:18 +0900 | [diff] [blame] | 426 | // It's safe to call getpeername here, because we only send unicast packets if we |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 427 | // have an IP address, and we connect the UDP socket in DhcpBoundState#enter. |
| 428 | if (DBG) Log.d(TAG, String.format("Unicasting %s to %s", |
| 429 | description, Os.getpeername(mUdpSock))); |
Lorenzo Colitti | 4e4d59e | 2015-09-10 18:12:18 +0900 | [diff] [blame] | 430 | Os.write(mUdpSock, buf); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 431 | } |
| 432 | } catch(ErrnoException|IOException e) { |
| 433 | Log.e(TAG, "Can't send packet: ", e); |
| 434 | return false; |
| 435 | } |
| 436 | return true; |
| 437 | } |
| 438 | |
| 439 | private boolean sendDiscoverPacket() { |
| 440 | ByteBuffer packet = DhcpPacket.buildDiscoverPacket( |
Lorenzo Colitti | 3e97932 | 2015-04-21 15:22:17 +0900 | [diff] [blame] | 441 | DhcpPacket.ENCAP_L2, mTransactionId, getSecs(), mHwAddr, |
| 442 | DO_UNICAST, REQUESTED_PARAMS); |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 443 | return transmitPacket(packet, "DHCPDISCOVER", DhcpPacket.ENCAP_L2, INADDR_BROADCAST); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | private boolean sendRequestPacket( |
| 447 | Inet4Address clientAddress, Inet4Address requestedAddress, |
| 448 | Inet4Address serverAddress, Inet4Address to) { |
| 449 | // TODO: should we use the transaction ID from the server? |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 450 | final int encap = INADDR_ANY.equals(clientAddress) |
| 451 | ? DhcpPacket.ENCAP_L2 : DhcpPacket.ENCAP_BOOTP; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 452 | |
| 453 | ByteBuffer packet = DhcpPacket.buildRequestPacket( |
Lorenzo Colitti | 3e97932 | 2015-04-21 15:22:17 +0900 | [diff] [blame] | 454 | encap, mTransactionId, getSecs(), clientAddress, |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 455 | DO_UNICAST, mHwAddr, requestedAddress, |
| 456 | serverAddress, REQUESTED_PARAMS, null); |
Lorenzo Colitti | 7611f1c | 2015-10-29 15:21:54 +0900 | [diff] [blame] | 457 | String serverStr = (serverAddress != null) ? serverAddress.getHostAddress() : null; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 458 | String description = "DHCPREQUEST ciaddr=" + clientAddress.getHostAddress() + |
| 459 | " request=" + requestedAddress.getHostAddress() + |
Lorenzo Colitti | 7611f1c | 2015-10-29 15:21:54 +0900 | [diff] [blame] | 460 | " serverid=" + serverStr; |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 461 | return transmitPacket(packet, description, encap, to); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 462 | } |
| 463 | |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 464 | private void scheduleLeaseTimers() { |
| 465 | if (mDhcpLeaseExpiry == 0) { |
| 466 | Log.d(TAG, "Infinite lease, no timer scheduling needed"); |
| 467 | return; |
Lorenzo Colitti | d973537 | 2015-06-02 13:15:50 +0900 | [diff] [blame] | 468 | } |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 469 | |
| 470 | final long now = SystemClock.elapsedRealtime(); |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 471 | |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 472 | // TODO: consider getting the renew and rebind timers from T1 and T2. |
| 473 | // See also: |
| 474 | // https://tools.ietf.org/html/rfc2131#section-4.4.5 |
| 475 | // https://tools.ietf.org/html/rfc1533#section-9.9 |
| 476 | // https://tools.ietf.org/html/rfc1533#section-9.10 |
| 477 | final long remainingDelay = mDhcpLeaseExpiry - now; |
| 478 | final long renewDelay = remainingDelay / 2; |
| 479 | final long rebindDelay = remainingDelay * 7 / 8; |
| 480 | mRenewAlarm.schedule(now + renewDelay); |
| 481 | mRebindAlarm.schedule(now + rebindDelay); |
| 482 | mExpiryAlarm.schedule(now + remainingDelay); |
| 483 | Log.d(TAG, "Scheduling renewal in " + (renewDelay / 1000) + "s"); |
| 484 | Log.d(TAG, "Scheduling rebind in " + (rebindDelay / 1000) + "s"); |
| 485 | Log.d(TAG, "Scheduling expiry in " + (remainingDelay / 1000) + "s"); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 486 | } |
| 487 | |
Lorenzo Colitti | 48f9c73 | 2015-06-02 16:50:36 +0900 | [diff] [blame] | 488 | private void notifySuccess() { |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 489 | mController.sendMessage( |
| 490 | CMD_POST_DHCP_ACTION, DHCP_SUCCESS, 0, new DhcpResults(mDhcpLease)); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 491 | } |
| 492 | |
| 493 | private void notifyFailure() { |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 494 | mController.sendMessage(CMD_POST_DHCP_ACTION, DHCP_FAILURE, 0, null); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 495 | } |
| 496 | |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 497 | private void acceptDhcpResults(DhcpResults results, String msg) { |
| 498 | mDhcpLease = results; |
| 499 | mOffer = null; |
| 500 | Log.d(TAG, msg + " lease: " + mDhcpLease); |
| 501 | notifySuccess(); |
| 502 | } |
| 503 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 504 | private void clearDhcpState() { |
| 505 | mDhcpLease = null; |
| 506 | mDhcpLeaseExpiry = 0; |
| 507 | mOffer = null; |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * Quit the DhcpStateMachine. |
| 512 | * |
| 513 | * @hide |
| 514 | */ |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 515 | public void doQuit() { |
| 516 | Log.d(TAG, "doQuit"); |
| 517 | quit(); |
| 518 | } |
| 519 | |
Erik Kline | efa4209 | 2016-02-18 12:40:11 +0900 | [diff] [blame] | 520 | @Override |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 521 | protected void onQuitting() { |
| 522 | Log.d(TAG, "onQuitting"); |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 523 | mController.sendMessage(CMD_ON_QUIT); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 524 | } |
| 525 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 526 | abstract class LoggingState extends State { |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 527 | private long mEnterTimeMs; |
| 528 | |
Erik Kline | 5b76623 | 2016-04-06 11:18:10 +0900 | [diff] [blame] | 529 | @Override |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 530 | public void enter() { |
Hugo Benichi | 2677b19 | 2016-04-18 09:04:04 +0900 | [diff] [blame] | 531 | if (STATE_DBG) Log.d(TAG, "Entering state " + getName()); |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 532 | mEnterTimeMs = SystemClock.elapsedRealtime(); |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | @Override |
| 536 | public void exit() { |
| 537 | long durationMs = SystemClock.elapsedRealtime() - mEnterTimeMs; |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 538 | logState(getName(), (int) durationMs); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | private String messageName(int what) { |
Lorenzo Colitti | d2457a3 | 2016-02-18 00:32:44 +0900 | [diff] [blame] | 542 | return sMessageNames.get(what, Integer.toString(what)); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 543 | } |
| 544 | |
| 545 | private String messageToString(Message message) { |
| 546 | long now = SystemClock.uptimeMillis(); |
Remi NGUYEN VAN | c1c02dc | 2019-01-20 16:50:42 +0900 | [diff] [blame] | 547 | return new StringBuilder(" ") |
| 548 | .append(message.getWhen() - now) |
| 549 | .append(messageName(message.what)) |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 550 | .append(" ").append(message.arg1) |
| 551 | .append(" ").append(message.arg2) |
Remi NGUYEN VAN | c1c02dc | 2019-01-20 16:50:42 +0900 | [diff] [blame] | 552 | .append(" ").append(message.obj) |
| 553 | .toString(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 554 | } |
| 555 | |
| 556 | @Override |
| 557 | public boolean processMessage(Message message) { |
| 558 | if (MSG_DBG) { |
| 559 | Log.d(TAG, getName() + messageToString(message)); |
| 560 | } |
| 561 | return NOT_HANDLED; |
| 562 | } |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 563 | |
| 564 | @Override |
| 565 | public String getName() { |
| 566 | // All DhcpClient's states are inner classes with a well defined name. |
| 567 | // Use getSimpleName() and avoid super's getName() creating new String instances. |
| 568 | return getClass().getSimpleName(); |
| 569 | } |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 570 | } |
| 571 | |
| 572 | // Sends CMD_PRE_DHCP_ACTION to the controller, waits for the controller to respond with |
| 573 | // CMD_PRE_DHCP_ACTION_COMPLETE, and then transitions to mOtherState. |
| 574 | abstract class WaitBeforeOtherState extends LoggingState { |
| 575 | protected State mOtherState; |
| 576 | |
| 577 | @Override |
| 578 | public void enter() { |
| 579 | super.enter(); |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 580 | mController.sendMessage(CMD_PRE_DHCP_ACTION); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | @Override |
| 584 | public boolean processMessage(Message message) { |
| 585 | super.processMessage(message); |
| 586 | switch (message.what) { |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 587 | case CMD_PRE_DHCP_ACTION_COMPLETE: |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 588 | transitionTo(mOtherState); |
| 589 | return HANDLED; |
| 590 | default: |
| 591 | return NOT_HANDLED; |
| 592 | } |
| 593 | } |
| 594 | } |
| 595 | |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 596 | class StoppedState extends State { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 597 | @Override |
| 598 | public boolean processMessage(Message message) { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 599 | switch (message.what) { |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 600 | case CMD_START_DHCP: |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 601 | if (mRegisteredForPreDhcpNotification) { |
| 602 | transitionTo(mWaitBeforeStartState); |
| 603 | } else { |
| 604 | transitionTo(mDhcpInitState); |
| 605 | } |
| 606 | return HANDLED; |
| 607 | default: |
| 608 | return NOT_HANDLED; |
| 609 | } |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | class WaitBeforeStartState extends WaitBeforeOtherState { |
| 614 | public WaitBeforeStartState(State otherState) { |
| 615 | super(); |
| 616 | mOtherState = otherState; |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | class WaitBeforeRenewalState extends WaitBeforeOtherState { |
| 621 | public WaitBeforeRenewalState(State otherState) { |
| 622 | super(); |
| 623 | mOtherState = otherState; |
| 624 | } |
| 625 | } |
| 626 | |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 627 | class DhcpState extends State { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 628 | @Override |
| 629 | public void enter() { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 630 | clearDhcpState(); |
| 631 | if (initInterface() && initSockets()) { |
| 632 | mReceiveThread = new ReceiveThread(); |
| 633 | mReceiveThread.start(); |
| 634 | } else { |
| 635 | notifyFailure(); |
| 636 | transitionTo(mStoppedState); |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | @Override |
| 641 | public void exit() { |
Lorenzo Colitti | 31e19f3 | 2015-08-11 15:42:59 +0900 | [diff] [blame] | 642 | if (mReceiveThread != null) { |
| 643 | mReceiveThread.halt(); // Also closes sockets. |
| 644 | mReceiveThread = null; |
| 645 | } |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 646 | clearDhcpState(); |
| 647 | } |
| 648 | |
| 649 | @Override |
| 650 | public boolean processMessage(Message message) { |
| 651 | super.processMessage(message); |
| 652 | switch (message.what) { |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 653 | case CMD_STOP_DHCP: |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 654 | transitionTo(mStoppedState); |
| 655 | return HANDLED; |
| 656 | default: |
| 657 | return NOT_HANDLED; |
| 658 | } |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | public boolean isValidPacket(DhcpPacket packet) { |
| 663 | // TODO: check checksum. |
| 664 | int xid = packet.getTransactionId(); |
| 665 | if (xid != mTransactionId) { |
| 666 | Log.d(TAG, "Unexpected transaction ID " + xid + ", expected " + mTransactionId); |
| 667 | return false; |
| 668 | } |
| 669 | if (!Arrays.equals(packet.getClientMac(), mHwAddr)) { |
| 670 | Log.d(TAG, "MAC addr mismatch: got " + |
| 671 | HexDump.toHexString(packet.getClientMac()) + ", expected " + |
| 672 | HexDump.toHexString(packet.getClientMac())); |
| 673 | return false; |
| 674 | } |
| 675 | return true; |
| 676 | } |
| 677 | |
Lorenzo Colitti | d973537 | 2015-06-02 13:15:50 +0900 | [diff] [blame] | 678 | public void setDhcpLeaseExpiry(DhcpPacket packet) { |
| 679 | long leaseTimeMillis = packet.getLeaseTimeMillis(); |
| 680 | mDhcpLeaseExpiry = |
| 681 | (leaseTimeMillis > 0) ? SystemClock.elapsedRealtime() + leaseTimeMillis : 0; |
| 682 | } |
| 683 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 684 | /** |
| 685 | * Retransmits packets using jittered exponential backoff with an optional timeout. Packet |
Lorenzo Colitti | 3a40b0d | 2015-06-03 13:46:12 +0900 | [diff] [blame] | 686 | * transmission is triggered by CMD_KICK, which is sent by an AlarmManager alarm. If a subclass |
| 687 | * sets mTimeout to a positive value, then timeout() is called by an AlarmManager alarm mTimeout |
| 688 | * milliseconds after entering the state. Kicks and timeouts are cancelled when leaving the |
| 689 | * state. |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 690 | * |
| 691 | * Concrete subclasses must implement sendPacket, which is called when the alarm fires and a |
| 692 | * packet needs to be transmitted, and receivePacket, which is triggered by CMD_RECEIVED_PACKET |
Lorenzo Colitti | 5bc64b8 | 2015-06-04 17:52:55 +0900 | [diff] [blame] | 693 | * sent by the receive thread. They may also set mTimeout and implement timeout. |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 694 | */ |
| 695 | abstract class PacketRetransmittingState extends LoggingState { |
| 696 | |
| 697 | private int mTimer; |
| 698 | protected int mTimeout = 0; |
| 699 | |
| 700 | @Override |
| 701 | public void enter() { |
| 702 | super.enter(); |
| 703 | initTimer(); |
| 704 | maybeInitTimeout(); |
| 705 | sendMessage(CMD_KICK); |
| 706 | } |
| 707 | |
| 708 | @Override |
| 709 | public boolean processMessage(Message message) { |
| 710 | super.processMessage(message); |
| 711 | switch (message.what) { |
| 712 | case CMD_KICK: |
| 713 | sendPacket(); |
| 714 | scheduleKick(); |
| 715 | return HANDLED; |
| 716 | case CMD_RECEIVED_PACKET: |
| 717 | receivePacket((DhcpPacket) message.obj); |
| 718 | return HANDLED; |
| 719 | case CMD_TIMEOUT: |
| 720 | timeout(); |
| 721 | return HANDLED; |
| 722 | default: |
| 723 | return NOT_HANDLED; |
| 724 | } |
| 725 | } |
| 726 | |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 727 | @Override |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 728 | public void exit() { |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 729 | super.exit(); |
Lorenzo Colitti | 831204c | 2015-11-22 18:37:16 +0900 | [diff] [blame] | 730 | mKickAlarm.cancel(); |
| 731 | mTimeoutAlarm.cancel(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 732 | } |
| 733 | |
| 734 | abstract protected boolean sendPacket(); |
| 735 | abstract protected void receivePacket(DhcpPacket packet); |
Lorenzo Colitti | 5bc64b8 | 2015-06-04 17:52:55 +0900 | [diff] [blame] | 736 | protected void timeout() {} |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 737 | |
| 738 | protected void initTimer() { |
| 739 | mTimer = FIRST_TIMEOUT_MS; |
| 740 | } |
| 741 | |
| 742 | protected int jitterTimer(int baseTimer) { |
| 743 | int maxJitter = baseTimer / 10; |
| 744 | int jitter = mRandom.nextInt(2 * maxJitter) - maxJitter; |
| 745 | return baseTimer + jitter; |
| 746 | } |
| 747 | |
| 748 | protected void scheduleKick() { |
| 749 | long now = SystemClock.elapsedRealtime(); |
| 750 | long timeout = jitterTimer(mTimer); |
| 751 | long alarmTime = now + timeout; |
Lorenzo Colitti | 9d3aadb | 2015-12-02 17:51:28 +0900 | [diff] [blame] | 752 | mKickAlarm.schedule(alarmTime); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 753 | mTimer *= 2; |
| 754 | if (mTimer > MAX_TIMEOUT_MS) { |
| 755 | mTimer = MAX_TIMEOUT_MS; |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | protected void maybeInitTimeout() { |
| 760 | if (mTimeout > 0) { |
| 761 | long alarmTime = SystemClock.elapsedRealtime() + mTimeout; |
Lorenzo Colitti | 9d3aadb | 2015-12-02 17:51:28 +0900 | [diff] [blame] | 762 | mTimeoutAlarm.schedule(alarmTime); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 763 | } |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | class DhcpInitState extends PacketRetransmittingState { |
| 768 | public DhcpInitState() { |
| 769 | super(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 770 | } |
| 771 | |
| 772 | @Override |
| 773 | public void enter() { |
| 774 | super.enter(); |
Lorenzo Colitti | 3e97932 | 2015-04-21 15:22:17 +0900 | [diff] [blame] | 775 | startNewTransaction(); |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 776 | mLastInitEnterTime = SystemClock.elapsedRealtime(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 777 | } |
| 778 | |
| 779 | protected boolean sendPacket() { |
| 780 | return sendDiscoverPacket(); |
| 781 | } |
| 782 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 783 | protected void receivePacket(DhcpPacket packet) { |
| 784 | if (!isValidPacket(packet)) return; |
| 785 | if (!(packet instanceof DhcpOfferPacket)) return; |
| 786 | mOffer = packet.toDhcpResults(); |
| 787 | if (mOffer != null) { |
| 788 | Log.d(TAG, "Got pending lease: " + mOffer); |
| 789 | transitionTo(mDhcpRequestingState); |
| 790 | } |
| 791 | } |
| 792 | } |
| 793 | |
| 794 | // Not implemented. We request the first offer we receive. |
| 795 | class DhcpSelectingState extends LoggingState { |
| 796 | } |
| 797 | |
| 798 | class DhcpRequestingState extends PacketRetransmittingState { |
| 799 | public DhcpRequestingState() { |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 800 | mTimeout = DHCP_TIMEOUT_MS / 2; |
| 801 | } |
| 802 | |
| 803 | protected boolean sendPacket() { |
| 804 | return sendRequestPacket( |
| 805 | INADDR_ANY, // ciaddr |
| 806 | (Inet4Address) mOffer.ipAddress.getAddress(), // DHCP_REQUESTED_IP |
| 807 | (Inet4Address) mOffer.serverAddress, // DHCP_SERVER_IDENTIFIER |
| 808 | INADDR_BROADCAST); // packet destination address |
| 809 | } |
| 810 | |
| 811 | protected void receivePacket(DhcpPacket packet) { |
| 812 | if (!isValidPacket(packet)) return; |
| 813 | if ((packet instanceof DhcpAckPacket)) { |
| 814 | DhcpResults results = packet.toDhcpResults(); |
| 815 | if (results != null) { |
Lorenzo Colitti | d973537 | 2015-06-02 13:15:50 +0900 | [diff] [blame] | 816 | setDhcpLeaseExpiry(packet); |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 817 | acceptDhcpResults(results, "Confirmed"); |
Erik Kline | 5b76623 | 2016-04-06 11:18:10 +0900 | [diff] [blame] | 818 | transitionTo(mConfiguringInterfaceState); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 819 | } |
| 820 | } else if (packet instanceof DhcpNakPacket) { |
Lorenzo Colitti | 4e4d59e | 2015-09-10 18:12:18 +0900 | [diff] [blame] | 821 | // TODO: Wait a while before returning into INIT state. |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 822 | Log.d(TAG, "Received NAK, returning to INIT"); |
| 823 | mOffer = null; |
| 824 | transitionTo(mDhcpInitState); |
| 825 | } |
| 826 | } |
Lorenzo Colitti | 5bc64b8 | 2015-06-04 17:52:55 +0900 | [diff] [blame] | 827 | |
| 828 | @Override |
| 829 | protected void timeout() { |
| 830 | // After sending REQUESTs unsuccessfully for a while, go back to init. |
| 831 | transitionTo(mDhcpInitState); |
| 832 | } |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 833 | } |
| 834 | |
Hugo Benichi | 176ed01 | 2016-07-01 10:06:56 +0900 | [diff] [blame] | 835 | class DhcpHaveLeaseState extends State { |
Lorenzo Colitti | 48f9c73 | 2015-06-02 16:50:36 +0900 | [diff] [blame] | 836 | @Override |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 837 | public boolean processMessage(Message message) { |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 838 | switch (message.what) { |
| 839 | case CMD_EXPIRE_DHCP: |
| 840 | Log.d(TAG, "Lease expired!"); |
| 841 | notifyFailure(); |
| 842 | transitionTo(mDhcpInitState); |
| 843 | return HANDLED; |
| 844 | default: |
| 845 | return NOT_HANDLED; |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | @Override |
Lorenzo Colitti | 48f9c73 | 2015-06-02 16:50:36 +0900 | [diff] [blame] | 850 | public void exit() { |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 851 | // Clear any extant alarms. |
| 852 | mRenewAlarm.cancel(); |
| 853 | mRebindAlarm.cancel(); |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 854 | mExpiryAlarm.cancel(); |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 855 | clearDhcpState(); |
Erik Kline | 5b76623 | 2016-04-06 11:18:10 +0900 | [diff] [blame] | 856 | // Tell IpManager to clear the IPv4 address. There is no need to |
| 857 | // wait for confirmation since any subsequent packets are sent from |
| 858 | // INADDR_ANY anyway (DISCOVER, REQUEST). |
| 859 | mController.sendMessage(CMD_CLEAR_LINKADDRESS); |
| 860 | } |
| 861 | } |
| 862 | |
| 863 | class ConfiguringInterfaceState extends LoggingState { |
| 864 | @Override |
| 865 | public void enter() { |
| 866 | super.enter(); |
| 867 | mController.sendMessage(CMD_CONFIGURE_LINKADDRESS, mDhcpLease.ipAddress); |
| 868 | } |
| 869 | |
| 870 | @Override |
| 871 | public boolean processMessage(Message message) { |
| 872 | super.processMessage(message); |
| 873 | switch (message.what) { |
| 874 | case EVENT_LINKADDRESS_CONFIGURED: |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 875 | transitionTo(mDhcpBoundState); |
Erik Kline | 5b76623 | 2016-04-06 11:18:10 +0900 | [diff] [blame] | 876 | return HANDLED; |
| 877 | default: |
| 878 | return NOT_HANDLED; |
| 879 | } |
Lorenzo Colitti | 48f9c73 | 2015-06-02 16:50:36 +0900 | [diff] [blame] | 880 | } |
| 881 | } |
| 882 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 883 | class DhcpBoundState extends LoggingState { |
| 884 | @Override |
| 885 | public void enter() { |
| 886 | super.enter(); |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 887 | if (mDhcpLease.serverAddress != null && !connectUdpSock(mDhcpLease.serverAddress)) { |
| 888 | // There's likely no point in going into DhcpInitState here, we'll probably |
| 889 | // just repeat the transaction, get the same IP address as before, and fail. |
| 890 | // |
| 891 | // NOTE: It is observed that connectUdpSock() basically never fails, due to |
| 892 | // SO_BINDTODEVICE. Examining the local socket address shows it will happily |
| 893 | // return an IPv4 address from another interface, or even return "0.0.0.0". |
| 894 | // |
| 895 | // TODO: Consider deleting this check, following testing on several kernels. |
| 896 | notifyFailure(); |
| 897 | transitionTo(mStoppedState); |
| 898 | } |
| 899 | |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 900 | scheduleLeaseTimers(); |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 901 | logTimeToBoundState(); |
| 902 | } |
| 903 | |
| 904 | @Override |
| 905 | public void exit() { |
| 906 | super.exit(); |
| 907 | mLastBoundExitTime = SystemClock.elapsedRealtime(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 908 | } |
| 909 | |
| 910 | @Override |
| 911 | public boolean processMessage(Message message) { |
| 912 | super.processMessage(message); |
| 913 | switch (message.what) { |
Erik Kline | 09bf135 | 2016-02-12 00:17:02 +0900 | [diff] [blame] | 914 | case CMD_RENEW_DHCP: |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 915 | if (mRegisteredForPreDhcpNotification) { |
| 916 | transitionTo(mWaitBeforeRenewalState); |
| 917 | } else { |
| 918 | transitionTo(mDhcpRenewingState); |
| 919 | } |
| 920 | return HANDLED; |
| 921 | default: |
| 922 | return NOT_HANDLED; |
| 923 | } |
| 924 | } |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 925 | |
| 926 | private void logTimeToBoundState() { |
| 927 | long now = SystemClock.elapsedRealtime(); |
| 928 | if (mLastBoundExitTime > mLastInitEnterTime) { |
Remi NGUYEN VAN | 231b52b | 2019-01-29 15:38:52 +0900 | [diff] [blame] | 929 | logState(EVENT_RENEWING_BOUND, (int) (now - mLastBoundExitTime)); |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 930 | } else { |
Remi NGUYEN VAN | 231b52b | 2019-01-29 15:38:52 +0900 | [diff] [blame] | 931 | logState(EVENT_INITIAL_BOUND, (int) (now - mLastInitEnterTime)); |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 932 | } |
| 933 | } |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 934 | } |
| 935 | |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 936 | abstract class DhcpReacquiringState extends PacketRetransmittingState { |
| 937 | protected String mLeaseMsg; |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 938 | |
| 939 | @Override |
| 940 | public void enter() { |
| 941 | super.enter(); |
Lorenzo Colitti | 3e97932 | 2015-04-21 15:22:17 +0900 | [diff] [blame] | 942 | startNewTransaction(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 943 | } |
| 944 | |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 945 | abstract protected Inet4Address packetDestination(); |
| 946 | |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 947 | protected boolean sendPacket() { |
| 948 | return sendRequestPacket( |
| 949 | (Inet4Address) mDhcpLease.ipAddress.getAddress(), // ciaddr |
| 950 | INADDR_ANY, // DHCP_REQUESTED_IP |
Lorenzo Colitti | 7611f1c | 2015-10-29 15:21:54 +0900 | [diff] [blame] | 951 | null, // DHCP_SERVER_IDENTIFIER |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 952 | packetDestination()); // packet destination address |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | protected void receivePacket(DhcpPacket packet) { |
| 956 | if (!isValidPacket(packet)) return; |
| 957 | if ((packet instanceof DhcpAckPacket)) { |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 958 | final DhcpResults results = packet.toDhcpResults(); |
| 959 | if (results != null) { |
| 960 | if (!mDhcpLease.ipAddress.equals(results.ipAddress)) { |
| 961 | Log.d(TAG, "Renewed lease not for our current IP address!"); |
| 962 | notifyFailure(); |
| 963 | transitionTo(mDhcpInitState); |
| 964 | } |
| 965 | setDhcpLeaseExpiry(packet); |
| 966 | // Updating our notion of DhcpResults here only causes the |
| 967 | // DNS servers and routes to be updated in LinkProperties |
| 968 | // in IpManager and by any overridden relevant handlers of |
| 969 | // the registered IpManager.Callback. IP address changes |
| 970 | // are not supported here. |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 971 | acceptDhcpResults(results, mLeaseMsg); |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 972 | transitionTo(mDhcpBoundState); |
| 973 | } |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 974 | } else if (packet instanceof DhcpNakPacket) { |
Erik Kline | acda32c | 2016-05-13 17:50:25 +0900 | [diff] [blame] | 975 | Log.d(TAG, "Received NAK, returning to INIT"); |
| 976 | notifyFailure(); |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 977 | transitionTo(mDhcpInitState); |
| 978 | } |
| 979 | } |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 980 | } |
| 981 | |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 982 | class DhcpRenewingState extends DhcpReacquiringState { |
| 983 | public DhcpRenewingState() { |
| 984 | mLeaseMsg = "Renewed"; |
| 985 | } |
| 986 | |
| 987 | @Override |
| 988 | public boolean processMessage(Message message) { |
| 989 | if (super.processMessage(message) == HANDLED) { |
| 990 | return HANDLED; |
| 991 | } |
| 992 | |
| 993 | switch (message.what) { |
| 994 | case CMD_REBIND_DHCP: |
| 995 | transitionTo(mDhcpRebindingState); |
| 996 | return HANDLED; |
| 997 | default: |
| 998 | return NOT_HANDLED; |
| 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | @Override |
| 1003 | protected Inet4Address packetDestination() { |
| 1004 | // Not specifying a SERVER_IDENTIFIER option is a violation of RFC 2131, but... |
| 1005 | // http://b/25343517 . Try to make things work anyway by using broadcast renews. |
| 1006 | return (mDhcpLease.serverAddress != null) ? |
| 1007 | mDhcpLease.serverAddress : INADDR_BROADCAST; |
| 1008 | } |
| 1009 | } |
| 1010 | |
| 1011 | class DhcpRebindingState extends DhcpReacquiringState { |
| 1012 | public DhcpRebindingState() { |
| 1013 | mLeaseMsg = "Rebound"; |
| 1014 | } |
| 1015 | |
| 1016 | @Override |
| 1017 | public void enter() { |
| 1018 | super.enter(); |
| 1019 | |
| 1020 | // We need to broadcast and possibly reconnect the socket to a |
| 1021 | // completely different server. |
Remi NGUYEN VAN | 231b52b | 2019-01-29 15:38:52 +0900 | [diff] [blame] | 1022 | closeSocketQuietly(mUdpSock); |
Erik Kline | d8e1592 | 2016-04-26 18:41:09 +0900 | [diff] [blame] | 1023 | if (!initUdpSocket()) { |
| 1024 | Log.e(TAG, "Failed to recreate UDP socket"); |
| 1025 | transitionTo(mDhcpInitState); |
| 1026 | } |
| 1027 | } |
| 1028 | |
| 1029 | @Override |
| 1030 | protected Inet4Address packetDestination() { |
| 1031 | return INADDR_BROADCAST; |
| 1032 | } |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 1033 | } |
| 1034 | |
| 1035 | class DhcpInitRebootState extends LoggingState { |
| 1036 | } |
| 1037 | |
| 1038 | class DhcpRebootingState extends LoggingState { |
| 1039 | } |
Hugo Benichi | cfddd68 | 2016-05-31 16:28:06 +0900 | [diff] [blame] | 1040 | |
| 1041 | private void logError(int errorCode) { |
Hugo Benichi | 948a859 | 2017-03-16 16:33:47 +0900 | [diff] [blame] | 1042 | mMetricsLog.log(mIfaceName, new DhcpErrorEvent(errorCode)); |
Hugo Benichi | cfddd68 | 2016-05-31 16:28:06 +0900 | [diff] [blame] | 1043 | } |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 1044 | |
| 1045 | private void logState(String name, int durationMs) { |
Remi NGUYEN VAN | 7b84fb3 | 2019-01-19 21:13:24 +0900 | [diff] [blame] | 1046 | final DhcpClientEvent event = new DhcpClientEvent.Builder() |
| 1047 | .setMsg(name) |
| 1048 | .setDurationMs(durationMs) |
| 1049 | .build(); |
| 1050 | mMetricsLog.log(mIfaceName, event); |
Hugo Benichi | 7643423 | 2016-07-07 11:28:54 +0900 | [diff] [blame] | 1051 | } |
Lorenzo Colitti | a071edc | 2015-03-10 01:38:38 +0900 | [diff] [blame] | 1052 | } |