17da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt/* 27da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Copyright (C) 2010 The Android Open Source Project 37da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * 47da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Licensed under the Apache License, Version 2.0 (the "License"); 57da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * you may not use this file except in compliance with the License. 67da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * You may obtain a copy of the License at 77da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * 87da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * http://www.apache.org/licenses/LICENSE-2.0 97da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * 107da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Unless required by applicable law or agreed to in writing, software 117da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * distributed under the License is distributed on an "AS IS" BASIS, 127da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * See the License for the specific language governing permissions and 147da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * limitations under the License. 157da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 167da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 177da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttpackage android.net.dhcp; 187da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 197da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.net.Inet4Address; 207da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.nio.ByteBuffer; 217da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 227da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt/** 237da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * This class implements the DHCP-ACK packet. 247da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 257da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttclass DhcpAckPacket extends DhcpPacket { 267da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 277da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 287da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * The address of the server which sent this packet. 297da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 30c8a0f49feecaf231e3f5972bd247dfbc586ccb34Lorenzo Colitti private final Inet4Address mSrcIp; 317da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 323e979321a5d96b9e2688f67ef0f936602c0f7e5aLorenzo Colitti DhcpAckPacket(int transId, short secs, boolean broadcast, Inet4Address serverAddress, 33f68edb16116307553059a889ef456227a9697918Lorenzo Colitti Inet4Address clientIp, Inet4Address yourIp, byte[] clientMac) { 34f68edb16116307553059a889ef456227a9697918Lorenzo Colitti super(transId, secs, clientIp, yourIp, serverAddress, INADDR_ANY, clientMac, broadcast); 357da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt mBroadcast = broadcast; 367da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt mSrcIp = serverAddress; 377da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 387da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 397da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public String toString() { 407da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt String s = super.toString(); 417da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt String dnsServers = " DNS servers: "; 427da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 43c8a0f49feecaf231e3f5972bd247dfbc586ccb34Lorenzo Colitti for (Inet4Address dnsServer: mDnsServers) { 447da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt dnsServers += dnsServer.toString() + " "; 457da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 467da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 477da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return s + " ACK: your new IP " + mYourIp + 487da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt ", netmask " + mSubnetMask + 49025f4a5aae1660eda6406703771995010d9de990Lorenzo Colitti ", gateways " + mGateways + dnsServers + 507da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt ", lease time " + mLeaseTime; 517da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 527da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 537da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 547da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Fills in a packet with the requested ACK parameters. 557da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 567da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) { 577da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH); 58c8a0f49feecaf231e3f5972bd247dfbc586ccb34Lorenzo Colitti Inet4Address destIp = mBroadcast ? INADDR_BROADCAST : mYourIp; 59c8a0f49feecaf231e3f5972bd247dfbc586ccb34Lorenzo Colitti Inet4Address srcIp = mBroadcast ? INADDR_ANY : mSrcIp; 607da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 617da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt fillInPacket(encap, destIp, srcIp, destUdp, srcUdp, result, 627da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt DHCP_BOOTREPLY, mBroadcast); 637da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt result.flip(); 647da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return result; 657da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 667da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 677da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 687da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Adds the optional parameters to the client-generated ACK packet. 697da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 707da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt void finishPacket(ByteBuffer buffer) { 717da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_ACK); 727da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier); 737da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_LEASE_TIME, mLeaseTime); 747da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 757da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt // the client should renew at 1/2 the lease-expiry interval 767da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt if (mLeaseTime != null) { 777da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_RENEWAL_TIME, 787da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt Integer.valueOf(mLeaseTime.intValue() / 2)); 797da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 807da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 817da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_SUBNET_MASK, mSubnetMask); 82025f4a5aae1660eda6406703771995010d9de990Lorenzo Colitti addTlv(buffer, DHCP_ROUTER, mGateways); 837da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_DOMAIN_NAME, mDomainName); 847da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_BROADCAST_ADDRESS, mBroadcastAddress); 857da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_DNS_SERVER, mDnsServers); 867da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlvEnd(buffer); 877da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 887da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 897da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 907da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Un-boxes an Integer, returning 0 if a null reference is supplied. 917da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 927da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt private static final int getInt(Integer v) { 937da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt if (v == null) { 947da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return 0; 957da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } else { 967da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return v.intValue(); 977da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 987da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 997da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt} 100