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DhcpOfferPacket.javaAPI DocAndroid 5.1 API3435Thu Mar 12 22:22:10 GMT 2015android.net.dhcp

DhcpOfferPacket

public class DhcpOfferPacket extends DhcpPacket
This class implements the DHCP-OFFER packet.

Fields Summary
private final InetAddress
mSrcIp
The IP address of the server which sent this packet.
Constructors Summary
DhcpOfferPacket(int transId, boolean broadcast, InetAddress serverAddress, InetAddress clientIp, byte[] clientMac)
Generates a OFFER packet with the specified parameters.

        super(transId, Inet4Address.ANY, clientIp, Inet4Address.ANY,
            Inet4Address.ANY, clientMac, broadcast);
        mSrcIp = serverAddress;
Methods Summary
public java.nio.ByteBufferbuildPacket(int encap, short destUdp, short srcUdp)
Fills in a packet with the specified OFFER attributes.

        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;
public voiddoNextOp(DhcpStateMachine machine)
Notifies the state machine of the OFFER packet parameters.

        machine.onOfferReceived(mBroadcast, mTransId, mClientMac, mYourIp,
            mServerIdentifier);
voidfinishPacket(java.nio.ByteBuffer buffer)
Adds the optional parameters to the server-generated OFFER packet.

        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);
public java.lang.StringtoString()

        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;