1 files changed, 100 insertions, 0 deletions
diff --git a/services/net/java/android/net/dhcp/DhcpOfferPacket.java b/services/net/java/android/net/dhcp/DhcpOfferPacket.java
new file mode 100644
index 0000000..f1c30e1
--- /dev/null
+++ b/services/net/java/android/net/dhcp/DhcpOfferPacket.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net.dhcp;
+
+import java.net.InetAddress;
+import java.net.Inet4Address;
+import java.nio.ByteBuffer;
+
+/**
+ * This class implements the DHCP-OFFER packet.
+ */
+class DhcpOfferPacket extends DhcpPacket {
+    /**
+     * The IP address of the server which sent this packet.
+     */
+    private final InetAddress mSrcIp;
+
+    /**
+     * Generates a OFFER packet with the specified parameters.
+     */
+    DhcpOfferPacket(int transId, boolean broadcast, InetAddress serverAddress,
+                    InetAddress clientIp, byte[] clientMac) {
+        super(transId, Inet4Address.ANY, clientIp, Inet4Address.ANY,
+            Inet4Address.ANY, clientMac, broadcast);
+        mSrcIp = serverAddress;
+    }
+
+    public String toString() {
+        String s = super.toString();
+        String dnsServers = ", DNS servers: ";
+
+        if (mDnsServers != null) {
+            for (InetAddress dnsServer: mDnsServers) {
+                dnsServers += dnsServer + " ";
+            }
+        }
+
+        return s + " OFFER, ip " + mYourIp + ", mask " + mSubnetMask +
+                dnsServers + ", gateway " + mGateway +
+                " lease time " + mLeaseTime + ", domain " + mDomainName;
+    }
+
+    /**
+     * Fills in a packet with the specified OFFER attributes.
+     */
+    public ByteBuffer buildPacket(int encap, short destUdp, short srcUdp) {
+        ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
+        InetAddress destIp = mBroadcast ? Inet4Address.ALL : mYourIp;
+        InetAddress srcIp = mBroadcast ? Inet4Address.ANY : mSrcIp;
+
+        fillInPacket(encap, destIp, srcIp, destUdp, srcUdp, result,
+            DHCP_BOOTREPLY, mBroadcast);
+        result.flip();
+        return result;
+    }
+
+    /**
+     * Adds the optional parameters to the server-generated OFFER packet.
+     */
+    void finishPacket(ByteBuffer buffer) {
+        addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_OFFER);
+        addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier);
+        addTlv(buffer, DHCP_LEASE_TIME, mLeaseTime);
+
+        // the client should renew at 1/2 the lease-expiry interval
+        if (mLeaseTime != null) {
+            addTlv(buffer, DHCP_RENEWAL_TIME,
+                Integer.valueOf(mLeaseTime.intValue() / 2));
+        }
+
+        addTlv(buffer, DHCP_SUBNET_MASK, mSubnetMask);
+        addTlv(buffer, DHCP_ROUTER, mGateway);
+        addTlv(buffer, DHCP_DOMAIN_NAME, mDomainName);
+        addTlv(buffer, DHCP_BROADCAST_ADDRESS, mBroadcastAddress);
+        addTlv(buffer, DHCP_DNS_SERVER, mDnsServers);
+        addTlvEnd(buffer);
+    }
+
+    /**
+     * Notifies the state machine of the OFFER packet parameters.
+     */
+    public void doNextOp(DhcpStateMachine machine) {
+        machine.onOfferReceived(mBroadcast, mTransId, mClientMac, mYourIp,
+            mServerIdentifier);
+    }
+}