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.InetAddress; 207da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.net.Inet4Address; 217da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.nio.ByteBuffer; 227da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttimport java.util.List; 237da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 247da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt/** 257da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * This class implements the DHCP-OFFER packet. 267da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 277da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnuttclass DhcpOfferPacket extends DhcpPacket { 287da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 297da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * The IP address of the server which sent this packet. 307da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 317da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt private final InetAddress mSrcIp; 327da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 337da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 347da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Generates a OFFER packet with the specified parameters. 357da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 367da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt DhcpOfferPacket(int transId, boolean broadcast, InetAddress serverAddress, 377da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt InetAddress clientIp, byte[] clientMac) { 387da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt super(transId, Inet4Address.ANY, clientIp, Inet4Address.ANY, 397da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt Inet4Address.ANY, clientMac, broadcast); 407da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt mSrcIp = serverAddress; 417da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 427da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 437da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public String toString() { 447da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt String s = super.toString(); 457da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt String dnsServers = ", DNS servers: "; 467da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 477da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt if (mDnsServers != null) { 487da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt for (InetAddress dnsServer: mDnsServers) { 497da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt dnsServers += dnsServer + " "; 507da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 517da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 527da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 537da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return s + " OFFER, ip " + mYourIp + ", mask " + mSubnetMask + 547da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt dnsServers + ", gateway " + mGateway + 557da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt " lease time " + mLeaseTime + ", domain " + mDomainName; 567da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 577da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 587da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 597da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Fills in a packet with the specified OFFER attributes. 607da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 617da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) { 627da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH); 637da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt InetAddress destIp = mBroadcast ? Inet4Address.ALL : mYourIp; 647da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt InetAddress srcIp = mBroadcast ? Inet4Address.ANY : mSrcIp; 657da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 667da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt fillInPacket(encap, destIp, srcIp, destUdp, srcUdp, result, 677da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt DHCP_BOOTREPLY, mBroadcast); 687da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt result.flip(); 697da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt return result; 707da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 717da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 727da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 737da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Adds the optional parameters to the server-generated OFFER packet. 747da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 757da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt void finishPacket(ByteBuffer buffer) { 767da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_OFFER); 777da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier); 787da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_LEASE_TIME, mLeaseTime); 797da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 807da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt // the client should renew at 1/2 the lease-expiry interval 817da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt if (mLeaseTime != null) { 827da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_RENEWAL_TIME, 837da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt Integer.valueOf(mLeaseTime.intValue() / 2)); 847da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 857da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 867da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_SUBNET_MASK, mSubnetMask); 877da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_ROUTER, mGateway); 887da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_DOMAIN_NAME, mDomainName); 897da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_BROADCAST_ADDRESS, mBroadcastAddress); 907da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlv(buffer, DHCP_DNS_SERVER, mDnsServers); 917da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt addTlvEnd(buffer); 927da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 937da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt 947da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt /** 957da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt * Notifies the state machine of the OFFER packet parameters. 967da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt */ 977da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt public void doNextOp(DhcpStateMachine machine) { 987da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt machine.onOfferReceived(mBroadcast, mTransId, mClientMac, mYourIp, 997da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt mServerIdentifier); 1007da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt } 1017da02ad3b7a8a0b13a2ccc84e666baa8e6370482Stan Chesnutt} 102