Context information for the DHCPv4 lease allocation. More...

#include <alloc_engine.h>

Inheritance diagram for isc::dhcp::AllocEngine::ClientContext4:

Public Member Functions
	ClientContext4 ()
	Default constructor. More...

	ClientContext4 (const Subnet4Ptr &subnet, const ClientIdPtr &clientid, const HWAddrPtr &hwaddr, const asiolink::IOAddress &requested_addr, const bool fwd_dns_update, const bool rev_dns_update, const std::string &hostname, const bool fake_allocation, const uint32_t offer_lft=0)
	Constructor with parameters. More...

void	addHostIdentifier (const Host::IdentifierType &id_type, const std::vector< uint8_t > &identifier)
	Convenience function adding host identifier into host_identifiers_ list. More...

ConstHostPtr	currentHost () const
	Returns host for currently selected subnet. More...

DdnsParamsPtr	getDdnsParams ()
	Returns the set of DDNS behavioral parameters based on the selected subnet. More...

ConstHostPtr	globalHost () const
	Returns global host reservation if there is one. More...

Public Attributes
hooks::CalloutHandlePtr	callout_handle_
	Callout handle associated with the client's message. More...

ClientIdPtr	clientid_
	Client identifier from the DHCP message. More...

Lease4Ptr	conflicting_lease_
	A pointer to the object representing a lease in conflict. More...

bool	early_global_reservations_lookup_
	Indicates if early global reservation is enabled. More...

bool	fake_allocation_
	Indicates if this is a real or fake allocation. More...

bool	fwd_dns_update_
	Perform forward DNS update. More...

IdentifierList	host_identifiers_
	A list holding host identifiers extracted from a message received by the server. More...

std::string	hostname_
	Hostname. More...

std::map< SubnetID, ConstHostPtr >	hosts_
	Holds a map of hosts belonging to the client within different subnets. More...

HWAddrPtr	hwaddr_
	HW address from the DHCP message. More...

Lease4Ptr	new_lease_
	A pointer to a newly allocated lease. More...

uint32_t	offer_lft_
	If not zero, then we will allocate on DISCOVER for this amount of time. More...

Lease4Ptr	old_lease_
	A pointer to an old lease that the client had before update. More...

Pkt4Ptr	query_
	A pointer to the client's message. More...

asiolink::IOAddress	requested_address_
	An address that the client desires. More...

bool	rev_dns_update_
	Perform reverse DNS update. More...

Subnet4Ptr	subnet_
	Subnet selected for the client by the server. More...

bool	unknown_requested_addr_
	True when the address DHCPREQUEST'ed by client is not within a dynamic pool the server knows about. More...

Detailed Description

Context information for the DHCPv4 lease allocation.

This structure holds a set of information provided by the DHCPv4 server to the allocation engine. In particular, it holds the client identifying information, such as HW address or client identifier. It also holds the information about the subnet that the client is connected to.

This structure is also used to pass some information from the allocation engine back to the server, i.e. the old lease which the client had before the allocation.

This structure is meant to be extended in the future, if more information should be passed to the allocation engine. Note that the big advantage of using the context structure to pass information to the allocation engine methods is that adding new information doesn't modify the API of the allocation engine.

Definition at line 1226 of file alloc_engine.h.

Constructor & Destructor Documentation

◆ ClientContext4() [1/2]

isc::dhcp::AllocEngine::ClientContext4::ClientContext4 ( )

Default constructor.

Definition at line 3570 of file alloc_engine.cc.

◆ ClientContext4() [2/2]

isc::dhcp::AllocEngine::ClientContext4::ClientContext4	(	const Subnet4Ptr &	subnet,
		const ClientIdPtr &	clientid,
		const HWAddrPtr &	hwaddr,
		const asiolink::IOAddress &	requested_addr,
		const bool	fwd_dns_update,
		const bool	rev_dns_update,
		const std::string &	hostname,
		const bool	fake_allocation,
		const uint32_t	offer_lft = `0`
	)

Constructor with parameters.

Parameters

subnet	subnet the allocation should come from (mandatory)
clientid	Client identifier (optional)
hwaddr	Client's hardware address info (mandatory)
requested_addr	A hint that the client provided (may be 0.0.0.0)
fwd_dns_update	Indicates whether forward DNS update will be performed for the client (true) or not (false).
rev_dns_update	Indicates whether reverse DNS update will be performed for the client (true) or not (false).
hostname	A string carrying hostname to be used for DNS updates.
fake_allocation	Is this real i.e. REQUEST (false) or just picking an address for DISCOVER that is not really allocated (true)
offer_lft	When not zero, leases ARE allocated on DISCOVER and use this value as lease lifetime.

Definition at line 3582 of file alloc_engine.cc.

References addHostIdentifier(), and isc::dhcp::Host::IDENT_HWADDR.

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Member Function Documentation

◆ addHostIdentifier()

void isc::dhcp::AllocEngine::ClientContext4::addHostIdentifier	(	const Host::IdentifierType &	id_type,
		const std::vector< uint8_t > &	identifier
	)

inline

Convenience function adding host identifier into host_identifiers_ list.

Parameters

id_type	Identifier type.
identifier	Identifier value.

Definition at line 1322 of file alloc_engine.h.

References host_identifiers_.

Referenced by ClientContext4().

◆ currentHost()

ConstHostPtr isc::dhcp::AllocEngine::ClientContext4::currentHost ( ) const

Returns host for currently selected subnet.

If there is no such host and global reservations are enabled returns the global host.

Returns: Pointer to the host object.

Definition at line 3607 of file alloc_engine.cc.

◆ getDdnsParams()

DdnsParamsPtr isc::dhcp::AllocEngine::ClientContext4::getDdnsParams ( )

Returns the set of DDNS behavioral parameters based on the selected subnet.

If there is no selected subnet (i.e. subnet_ is empty), the returned set will contain default values.

Returns: pointer to a DdnsParams instance

Definition at line 3631 of file alloc_engine.cc.

References isc::dhcp::CfgMgr::getCurrentCfg(), and isc::dhcp::CfgMgr::instance().

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◆ globalHost()

ConstHostPtr isc::dhcp::AllocEngine::ClientContext4::globalHost ( ) const

Returns global host reservation if there is one.

If the current subnet's reservations-global is true and there is a global host (i.e. reservation belonging to the global subnet), return it. Otherwise return an empty pointer.

Returns: Pointer to the host object.

Definition at line 3619 of file alloc_engine.cc.

Member Data Documentation

◆ callout_handle_

hooks::CalloutHandlePtr isc::dhcp::AllocEngine::ClientContext4::callout_handle_

Callout handle associated with the client's message.

Definition at line 1260 of file alloc_engine.h.

◆ clientid_

ClientIdPtr isc::dhcp::AllocEngine::ClientContext4::clientid_

Client identifier from the DHCP message.

Definition at line 1236 of file alloc_engine.h.

◆ conflicting_lease_

Lease4Ptr isc::dhcp::AllocEngine::ClientContext4::conflicting_lease_

A pointer to the object representing a lease in conflict.

This pointer is set by some of the allocation methods when the lease can't be allocated because there is another lease which is in conflict with this allocation.

Definition at line 1291 of file alloc_engine.h.

◆ early_global_reservations_lookup_

bool isc::dhcp::AllocEngine::ClientContext4::early_global_reservations_lookup_

Indicates if early global reservation is enabled.

This caches the early-global-reservations-lookup value.

Definition at line 1230 of file alloc_engine.h.

Referenced by isc::dhcp::AllocEngine::findReservation().

◆ fake_allocation_

bool isc::dhcp::AllocEngine::ClientContext4::fake_allocation_

Indicates if this is a real or fake allocation.

The real allocation is when the allocation engine is supposed to make an update in a lease database: create new lease, or update existing lease.

Definition at line 1267 of file alloc_engine.h.

Referenced by isc::dhcp::AllocEngine::allocateLease4(), and isc::dhcp::AllocEngine::getOfferLft().

◆ fwd_dns_update_

bool isc::dhcp::AllocEngine::ClientContext4::fwd_dns_update_

Perform forward DNS update.

Definition at line 1248 of file alloc_engine.h.

◆ host_identifiers_

IdentifierList isc::dhcp::AllocEngine::ClientContext4::host_identifiers_

A list holding host identifiers extracted from a message received by the server.

Definition at line 1301 of file alloc_engine.h.

Referenced by addHostIdentifier(), isc::dhcp::AllocEngine::findGlobalReservation(), and isc::dhcp::AllocEngine::findReservation().

◆ hostname_

std::string isc::dhcp::AllocEngine::ClientContext4::hostname_

Hostname.

The server retrieves the hostname from the Client FQDN option, Hostname option or the host reservation record for the client.

Definition at line 1257 of file alloc_engine.h.

◆ hosts_

std::map<SubnetID, ConstHostPtr> isc::dhcp::AllocEngine::ClientContext4::hosts_

Holds a map of hosts belonging to the client within different subnets.

Multiple hosts may appear when the client belongs to a shared network.

Definition at line 1284 of file alloc_engine.h.

Referenced by isc::dhcp::AllocEngine::findReservation().

◆ hwaddr_

HWAddrPtr isc::dhcp::AllocEngine::ClientContext4::hwaddr_

HW address from the DHCP message.

Definition at line 1239 of file alloc_engine.h.

Referenced by isc::dhcp::AllocEngine::allocateLease4().

◆ new_lease_

Lease4Ptr isc::dhcp::AllocEngine::ClientContext4::new_lease_

A pointer to a newly allocated lease.

Definition at line 1277 of file alloc_engine.h.

Referenced by isc::dhcp::AllocEngine::allocateLease4().

◆ offer_lft_

uint32_t isc::dhcp::AllocEngine::ClientContext4::offer_lft_

If not zero, then we will allocate on DISCOVER for this amount of time.

Definition at line 1271 of file alloc_engine.h.

◆ old_lease_

Lease4Ptr isc::dhcp::AllocEngine::ClientContext4::old_lease_

A pointer to an old lease that the client had before update.

Definition at line 1274 of file alloc_engine.h.

Referenced by isc::dhcp::AllocEngine::allocateLease4().

◆ query_

Pkt4Ptr isc::dhcp::AllocEngine::ClientContext4::query_

A pointer to the client's message.

This is used in logging to retrieve the client's and the transaction identification information.

Definition at line 1297 of file alloc_engine.h.

Referenced by isc::dhcp::AllocEngine::allocateLease4(), isc::dhcp::AllocEngine::findReservation(), isc::dhcp::AllocEngine::getOfferLft(), isc::dhcp::AllocEngine::getValidLft(), and isc::dhcp::AllocEngine::updateLease4ExtendedInfo().

◆ requested_address_

asiolink::IOAddress isc::dhcp::AllocEngine::ClientContext4::requested_address_

An address that the client desires.

If this address is set to 0 it indicates that this address is unspecified.

Definition at line 1245 of file alloc_engine.h.

◆ rev_dns_update_

bool isc::dhcp::AllocEngine::ClientContext4::rev_dns_update_

Perform reverse DNS update.

Definition at line 1251 of file alloc_engine.h.

◆ subnet_

Subnet4Ptr isc::dhcp::AllocEngine::ClientContext4::subnet_

Subnet selected for the client by the server.

Definition at line 1233 of file alloc_engine.h.

Referenced by isc::dhcp::AllocEngine::allocateLease4(), isc::dhcp::AllocEngine::findReservation(), isc::dhcp::AllocEngine::getOfferLft(), isc::dhcp::AllocEngine::getValidLft(), and isc::dhcp::AllocEngine::updateLease4ExtendedInfo().

◆ unknown_requested_addr_

bool isc::dhcp::AllocEngine::ClientContext4::unknown_requested_addr_

True when the address DHCPREQUEST'ed by client is not within a dynamic pool the server knows about.

Definition at line 1305 of file alloc_engine.h.

The documentation for this struct was generated from the following files:

Public Member Functions

Public Attributes

Detailed Description

Constructor & Destructor Documentation

◆ ClientContext4() [1/2]

◆ ClientContext4() [2/2]

Member Function Documentation

◆ addHostIdentifier()

◆ currentHost()

◆ getDdnsParams()

◆ globalHost()

Member Data Documentation

◆ callout_handle_

◆ clientid_

◆ conflicting_lease_

◆ early_global_reservations_lookup_

◆ fake_allocation_

◆ fwd_dns_update_

◆ host_identifiers_

◆ hostname_

◆ hosts_

◆ hwaddr_

◆ new_lease_

◆ offer_lft_

◆ old_lease_

◆ query_

◆ requested_address_

◆ rev_dns_update_

◆ subnet_

◆ unknown_requested_addr_