org.apache.directory.server.dhcp.service

Class StoreBasedDhcpService

java.lang.Object

org.apache.directory.server.dhcp.service.AbstractDhcpService

org.apache.directory.server.dhcp.service.StoreBasedDhcpService

All Implemented Interfaces:

DhcpService

public class StoreBasedDhcpService
extends AbstractDhcpService

A default implementation of the DHCP service. Does the tedious low-level chores of handling DHCP messages, but delegates the lease-handling to a supplied DhcpStore.

See Also:

DhcpStore

Field Summary

Fields

Modifier and Type	Field and Description
private DhcpStore	dhcpStore

Constructor Summary

Constructors

Constructor and Description
StoreBasedDhcpService(DhcpStore dhcpStore)

Method Summary

Modifier and Type	Method and Description
private Lease	getExistingLease(java.net.InetSocketAddress clientAddress, DhcpMessage request) Try to get an existing lease.
private Lease	getLeaseOffer(java.net.InetSocketAddress clientAddress, DhcpMessage request) Determine a lease to offer in response to a DHCPDISCOVER message.
protected DhcpMessage	handleDISCOVER(java.net.InetSocketAddress localAddress, java.net.InetSocketAddress clientAddress, DhcpMessage request) Handle DHCPDISCOVER message.
protected DhcpMessage	handleRELEASE(java.net.InetSocketAddress localAddress, java.net.InetSocketAddress clientAddress, DhcpMessage request) Handle DHCPRELEASE message.
protected DhcpMessage	handleREQUEST(java.net.InetSocketAddress localAddress, java.net.InetSocketAddress clientAddress, DhcpMessage request) Handle DHCPREQUEST message.

Methods inherited from class org.apache.directory.server.dhcp.service.AbstractDhcpService

determineSelectionBase, getReplyFor, handleINFORM, handleOFFER, handleUnknownMessage, initGeneralReply, stripUnwantedOptions

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

dhcpStore

private final DhcpStore dhcpStore

Constructor Detail

StoreBasedDhcpService

public StoreBasedDhcpService(DhcpStore dhcpStore)

Method Detail

getExistingLease

private Lease getExistingLease(java.net.InetSocketAddress clientAddress,
                               DhcpMessage request)
                        throws DhcpException

Try to get an existing lease. The lease may have been created during earlier DHCP negotiations or a recent DHCPDISCOVER.

Parameters:

clientAddress -

request -

Returns:

Throws:

DhcpException

getLeaseOffer

private Lease getLeaseOffer(java.net.InetSocketAddress clientAddress,
                            DhcpMessage request)
                     throws DhcpException

Determine a lease to offer in response to a DHCPDISCOVER message.

When a server receives a DHCPDISCOVER message from a client, the server chooses a network address for the requesting client. If no address is available, the server may choose to report the problem to the system administrator. If an address is available, the new address SHOULD be chosen as follows:

• The client's current address as recorded in the client's current binding, ELSE
• The client's previous address as recorded in the client's (now expired or released) binding, if that address is in the server's pool of available addresses and not already allocated, ELSE
• The address requested in the 'Requested IP Address' option, if that address is valid and not already allocated, ELSE
• A new address allocated from the server's pool of available addresses; the address is selected based on the subnet from which the message was received (if 'giaddr' is 0) or on the address of the relay agent that forwarded the message ('giaddr' when not 0).

Parameters:

clientAddress -

request -

Returns:

Throws:

DhcpException

handleRELEASE

protected DhcpMessage handleRELEASE(java.net.InetSocketAddress localAddress,
                                    java.net.InetSocketAddress clientAddress,
                                    DhcpMessage request)
                             throws DhcpException

Description copied from class: AbstractDhcpService

Handle DHCPRELEASE message. The default implementation just ignores it.

Overrides:

handleRELEASE in class AbstractDhcpService

request - the request message

Returns:

DhcpMessage response message or null to ignore (don't reply to) it.

Throws:

DhcpException

handleDISCOVER

protected DhcpMessage handleDISCOVER(java.net.InetSocketAddress localAddress,
                                     java.net.InetSocketAddress clientAddress,
                                     DhcpMessage request)
                              throws DhcpException

Description copied from class: AbstractDhcpService

Handle DHCPDISCOVER message. The default implementation just ignores it.

Overrides:

handleDISCOVER in class AbstractDhcpService

request - the request message

Returns:

DhcpMessage response message or null to ignore (don't reply to) it.

Throws:

DhcpException

handleREQUEST

protected DhcpMessage handleREQUEST(java.net.InetSocketAddress localAddress,
                                    java.net.InetSocketAddress clientAddress,
                                    DhcpMessage request)
                             throws DhcpException

Description copied from class: AbstractDhcpService

Handle DHCPREQUEST message. The default implementation just ignores it.

Overrides:

handleREQUEST in class AbstractDhcpService

request - the request message

Returns:

DhcpMessage response message or null to ignore (don't reply to) it.

Throws:

DhcpException