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-OFFER packet. 247da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 257da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttclass DhcpOfferPacket extends DhcpPacket { 267da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 277da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * The IP address of the server which sent this packet. 287da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 29c8a0f49feecaf231e3f5972bd247dfbc586ccb34Lorenzo Colitti private final Inet4Address mSrcIp; 307da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 317da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 327da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Generates a OFFER packet with the specified parameters. 337da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 343e979321a5d96b9e2688f67ef0f936602c0f7e5aLorenzo Colitti DhcpOfferPacket(int transId, short secs, boolean broadcast, Inet4Address serverAddress, 35f68edb16116307553059a889ef456227a9697918Lorenzo Colitti Inet4Address clientIp, Inet4Address yourIp, byte[] clientMac) { 36f68edb16116307553059a889ef456227a9697918Lorenzo Colitti super(transId, secs, clientIp, yourIp, INADDR_ANY, INADDR_ANY, clientMac, broadcast); 377da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt mSrcIp = serverAddress; 387da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 397da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 407da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public String toString() { 417da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt String s = super.toString(); 427da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt String dnsServers = ", DNS servers: "; 437da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 447da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt if (mDnsServers != null) { 45c8a0f49feecaf231e3f5972bd247dfbc586ccb34Lorenzo Colitti for (Inet4Address dnsServer: mDnsServers) { 467da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt dnsServers += dnsServer + " "; 477da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 487da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 497da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 507da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return s + " OFFER, ip " + mYourIp + ", mask " + mSubnetMask + 51025f4a5aae1660eda6406703771995010d9de990Lorenzo Colitti dnsServers + ", gateways " + mGateways + 527da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt " lease time " + mLeaseTime + ", domain " + mDomainName; 537da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 547da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 557da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 567da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Fills in a packet with the specified OFFER attributes. 577da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 587da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) { 597da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH); 60c8a0f49feecaf231e3f5972bd247dfbc586ccb34Lorenzo Colitti Inet4Address destIp = mBroadcast ? INADDR_BROADCAST : mYourIp; 61c8a0f49feecaf231e3f5972bd247dfbc586ccb34Lorenzo Colitti Inet4Address srcIp = mBroadcast ? INADDR_ANY : mSrcIp; 627da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 637da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt fillInPacket(encap, destIp, srcIp, destUdp, srcUdp, result, 647da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt DHCP_BOOTREPLY, mBroadcast); 657da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt result.flip(); 667da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return result; 677da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 687da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 697da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 707da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Adds the optional parameters to the server-generated OFFER packet. 717da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 727da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt void finishPacket(ByteBuffer buffer) { 737da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_OFFER); 747da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier); 757da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_LEASE_TIME, mLeaseTime); 767da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 777da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt // the client should renew at 1/2 the lease-expiry interval 787da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt if (mLeaseTime != null) { 797da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_RENEWAL_TIME, 807da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt Integer.valueOf(mLeaseTime.intValue() / 2)); 817da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 827da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 837da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_SUBNET_MASK, mSubnetMask); 84025f4a5aae1660eda6406703771995010d9de990Lorenzo Colitti addTlv(buffer, DHCP_ROUTER, mGateways); 857da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_DOMAIN_NAME, mDomainName); 867da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_BROADCAST_ADDRESS, mBroadcastAddress); 877da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_DNS_SERVER, mDnsServers); 887da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlvEnd(buffer); 897da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 907da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt} 91