DHCPv4 server service. More...

#include <dhcp4_srv.h>

Inheritance diagram for isc::dhcp::Dhcpv4Srv:

Public Types
enum	RequirementLevel { FORBIDDEN , MANDATORY , OPTIONAL }
	defines if certain option may, must or must not appear More...

Public Member Functions
	Dhcpv4Srv (uint16_t server_port=DHCP4_SERVER_PORT, uint16_t client_port=0, const bool use_bcast=true, const bool direct_response_desired=true)
	Default constructor.

virtual	~Dhcpv4Srv ()
	Destructor. Used during DHCPv4 service shutdown.

CBControlDHCPv4Ptr	getCBControl () const
	Returns an object which controls access to the configuration backends.

asiolink::IOServicePtr &	getIOService ()
	Returns pointer to the IO service used by the server.

NetworkStatePtr &	getNetworkState ()
	Returns pointer to the network state used by the server.

bool	inTestMode () const
	Checks if the server is running in unit test mode.

Pkt4Ptr	processDhcp4Query (Pkt4Ptr query, bool allow_answer_park)
	Process a single incoming DHCPv4 query.

void	processDhcp4QueryAndSendResponse (Pkt4Ptr query, bool allow_answer_park)
	Process a single incoming DHCPv4 query.

Pkt4Ptr	processLocalizedQuery4 (AllocEngine::ClientContext4Ptr &ctx, bool allow_answer_park)
	Process a localized incoming DHCPv4 query.

void	processLocalizedQuery4AndSendResponse (Pkt4Ptr query, AllocEngine::ClientContext4Ptr &ctx, bool allow_answer_park)
	Process a localized incoming DHCPv4 query.

void	processLocalizedQuery4AndSendResponse (Pkt4Ptr query, bool allow_answer_park)
	Process a localized incoming DHCPv4 query.

Pkt4Ptr	processPacket (Pkt4Ptr query, bool allow_answer_park=true)
	Process a single incoming DHCPv4 packet.

void	processPacketAndSendResponse (Pkt4Ptr query)
	Process a single incoming DHCPv4 packet and sends the response.

void	processPacketAndSendResponseNoThrow (Pkt4Ptr query)
	Process a single incoming DHCPv4 packet and sends the response.

int	run ()
	Main server processing loop.

void	runOne ()
	Main server processing step.

void	sendResponseNoThrow (hooks::CalloutHandlePtr &callout_handle, Pkt4Ptr &query, Pkt4Ptr &rsp, ConstSubnet4Ptr &subnet)
	Process an unparked DHCPv4 packet and sends the response.

void	shutdown () override
	Instructs the server to shut down.

Public accessors returning values required to (re)open sockets.
uint16_t	getServerPort () const
	Get UDP port on which server should listen.

bool	useBroadcast () const
	Return bool value indicating that broadcast flags should be set on sockets.

void	startD2 ()
	Starts DHCP_DDNS client IO if DDNS updates are enabled.

void	stopD2 ()
	Stops DHCP_DDNS client IO if DDNS updates are enabled.

virtual void	d2ClientErrorHandler (const dhcp_ddns::NameChangeSender::Result result, dhcp_ddns::NameChangeRequestPtr &ncr)
	Implements the error handler for DHCP_DDNS IO errors.

void	discardPackets ()
	Discards parked packets Clears the packet parking lots of all packets.

bool	getSendResponsesToSource () const
	Returns value of the test_send_responses_to_source_ flag.

void	initContext0 (const Pkt4Ptr &query, AllocEngine::ClientContext4Ptr ctx)
	Initialize client context (first part).

bool	earlyGHRLookup (const Pkt4Ptr &query, AllocEngine::ClientContext4Ptr ctx)
	Initialize client context and perform early global reservations lookup.

Public Member Functions inherited from isc::process::Daemon
	Daemon ()
	Default constructor.

virtual	~Daemon ()
	Destructor.

void	checkConfigFile () const
	Checks the configuration file name.

virtual void	cleanup ()
	Performs final deconfiguration.

void	createPIDFile (int pid=0)
	Creates the PID file.

std::string	getConfigFile () const
	Returns config file name.

int	getExitValue ()
	Fetches the exit value.

std::string	getPIDFileDir () const
	Returns the directory used when forming default PID file name.

std::string	getPIDFileName () const
	Returns the current PID file name.

isc::data::ConstElementPtr	redactConfig (isc::data::ConstElementPtr const &config)
	Redact a configuration.

void	setConfigFile (const std::string &config_file)
	Sets the configuration file name.

void	setExitValue (int value)
	Sets the exit value.

void	setPIDFileDir (const std::string &pid_file_dir)
	Sets the PID file directory.

void	setPIDFileName (const std::string &pid_file_name)
	Sets PID file name.

virtual size_t	writeConfigFile (const std::string &config_file, isc::data::ConstElementPtr cfg=isc::data::ConstElementPtr()) const
	Writes current configuration to specified file.

Static Public Member Functions
static std::string	getVersion (bool extended)
	returns Kea version on stdout and exit.

Static Public Member Functions inherited from isc::process::Daemon
static void	configureLogger (const isc::data::ConstElementPtr &log_config, const isc::process::ConfigPtr &storage)
	Configures logger.

static std::string	getDefaultLoggerName ()
	Returns default logger name.

static std::string	getProcName ()
	returns the process name This value is used as when forming the default PID file name

static bool	getVerbose ()
	Returns if running in verbose mode.

static std::string	getVersion (bool extended)
	returns Kea version on stdout and exits.

static void	loggerInit (const char *log_name, bool verbose)
	Initializes logger.

static void	setDefaultLoggerName (const std::string &logger)
	Sets the default logger name.

static void	setProcName (const std::string &proc_name)
	Sets the process name.

static void	setVerbose (const bool verbose)
	Sets or clears verbose mode.

Functions filtering and sanity-checking received messages.
Todo These functions are supposed to be moved to a new class which will manage different rules for accepting and rejecting messages. Perhaps ticket #3116 is a good opportunity to do it.
static const std::string	VENDOR_CLASS_PREFIX
	this is a prefix added to the content of vendor-class option

uint16_t	server_port_
	UDP port number on which server listens.

uint16_t	client_port_
	UDP port number to which server sends all responses.

volatile bool	shutdown_
	Indicates if shutdown is in progress.

boost::shared_ptr< AllocEngine >	alloc_engine_
	Allocation Engine.

bool	use_bcast_
	Should broadcast be enabled on sockets (if true).

NetworkStatePtr	network_state_
	Holds information about disabled DHCP service and/or disabled subnet/network scopes.

CBControlDHCPv4Ptr	cb_control_
	Controls access to the configuration backends.

void	declineLease (const Lease4Ptr &lease, const Pkt4Ptr &decline, AllocEngine::ClientContext4Ptr &context)
	Marks lease as declined.

std::list< std::list< std::string > >	jsonPathsToRedact () const final override
	Return a list of all paths that contain passwords or secrets for kea-dhcp4.

static void	processStatsReceived (const Pkt4Ptr &query)
	Class methods for DHCPv4-over-DHCPv6 handler.

static void	processStatsSent (const Pkt4Ptr &response)
	Updates statistics for transmitted packets.

static int	getHookIndexBuffer4Receive ()
	Returns the index for "buffer4_receive" hook point.

static int	getHookIndexPkt4Receive ()
	Returns the index for "pkt4_receive" hook point.

static int	getHookIndexSubnet4Select ()
	Returns the index for "subnet4_select" hook point.

static int	getHookIndexLease4Release ()
	Returns the index for "lease4_release" hook point.

static int	getHookIndexPkt4Send ()
	Returns the index for "pkt4_send" hook point.

static int	getHookIndexBuffer4Send ()
	Returns the index for "buffer4_send" hook point.

static int	getHookIndexLease4Decline ()
	Returns the index for "lease4_decline" hook point.

bool	accept (const Pkt4Ptr &query)
	Checks whether received message should be processed or discarded.

bool	acceptDirectRequest (const Pkt4Ptr &query)
	Check if a message sent by directly connected client should be accepted or discarded.

bool	acceptMessageType (const Pkt4Ptr &query) const
	Check if received message type is valid for the server to process.

bool	acceptServerId (const Pkt4Ptr &pkt) const
	Verifies if the server id belongs to our server.

Pkt4Ptr	processDiscover (Pkt4Ptr &discover, AllocEngine::ClientContext4Ptr &context)
	Processes incoming DISCOVER and returns response.

Pkt4Ptr	processRequest (Pkt4Ptr &request, AllocEngine::ClientContext4Ptr &context)
	Processes incoming REQUEST and returns REPLY response.

void	processRelease (Pkt4Ptr &release, AllocEngine::ClientContext4Ptr &context)
	Processes incoming DHCPRELEASE messages.

void	processDecline (Pkt4Ptr &decline, AllocEngine::ClientContext4Ptr &context)
	Process incoming DHCPDECLINE messages.

Pkt4Ptr	processInform (Pkt4Ptr &inform, AllocEngine::ClientContext4Ptr &context)
	Processes incoming DHCPINFORM messages.

void	buildCfgOptionList (Dhcpv4Exchange &ex)
	Build the configured option list.

void	appendRequestedOptions (Dhcpv4Exchange &ex)
	Appends options requested by client.

void	appendRequestedVendorOptions (Dhcpv4Exchange &ex)
	Appends requested vendor options as requested by client.

bool	assignZero (ConstSubnet4Ptr &subnet, const ClientClasses &client_classes)
	Assign the 0.0.0.0 address to an IPv6-Only client.

void	assignLease (Dhcpv4Exchange &ex)
	Assigns a lease and appends corresponding options.

void	postAllocateNameUpdate (const AllocEngine::ClientContext4Ptr &ctx, const Lease4Ptr &lease, const Pkt4Ptr &query, const Pkt4Ptr &resp, bool client_name_changed)
	Update client name and DNS flags in the lease and response.

void	setTeeTimes (const Lease4Ptr &lease, const ConstSubnet4Ptr &subnet, Pkt4Ptr resp)
	Adds the T1 and T2 timers to the outbound response as appropriate.

void	appendBasicOptions (Dhcpv4Exchange &ex)
	Append basic options if they are not present.

void	setFixedFields (Dhcpv4Exchange &ex)
	Sets fixed fields of the outgoing packet.

void	processClientName (Dhcpv4Exchange &ex)
	Processes Client FQDN and Hostname Options sent by a client.

void	setPacketStatisticsDefaults ()
	This function sets statistics related to DHCPv4 packets processing to their initial values.

void	setSendResponsesToSource (bool value)
	Sets value of the test_send_responses_to_source_ flag.

void	serverDecline (hooks::CalloutHandlePtr &callout_handle, Pkt4Ptr &query, Lease4Ptr lease, bool lease_exists)
	Renders a lease declined after the server has detected, via ping-check or other means, that its address is already in-use.

void	serverDeclineNoThrow (hooks::CalloutHandlePtr &callout_handle, Pkt4Ptr &query, Lease4Ptr lease, bool lease_exists)
	Exception safe wrapper around serverDecline()

void	createNameChangeRequests (const Lease4Ptr &lease, const Lease4Ptr &old_lease, const DdnsParams &ddns_params)
	Creates NameChangeRequests which correspond to the lease which has been acquired.

void	renewLease (const Pkt4Ptr &renew, Pkt4Ptr &reply)
	Attempts to renew received addresses.

void	adjustIfaceData (Dhcpv4Exchange &ex)
	Set IP/UDP and interface parameters for the DHCPv4 response.

void	adjustRemoteAddr (Dhcpv4Exchange &ex)
	Sets remote addresses for outgoing packet.

isc::dhcp::ConstSubnet4Ptr	selectSubnet (const Pkt4Ptr &query, bool &drop, bool sanity_only=false, bool allow_answer_park=true)
	Selects a subnet for a given client's packet.

isc::dhcp::ConstSubnet4Ptr	selectSubnet4o6 (const Pkt4Ptr &query, bool &drop, bool sanity_only=false, bool allow_answer_park=true)
	Selects a subnet for a given client's DHCP4o6 packet.

virtual Pkt4Ptr	receivePacket (int timeout)
	dummy wrapper around IfaceMgr::receive4

virtual void	sendPacket (const Pkt4Ptr &pkt)
	dummy wrapper around IfaceMgr::send()

void	classifyPacket (const Pkt4Ptr &pkt)
	Assigns incoming packet to zero or more classes.

void	recoverStashedAgentOption (const Pkt4Ptr &query)
	Recover stashed agent options from client address lease.

void	evaluateAdditionalClasses (Dhcpv4Exchange &ex)
	Evaluates classes in the additional classes lists.

void	deferredUnpack (Pkt4Ptr &query)
	Perform deferred option unpacking.

void	processPacketPktSend (hooks::CalloutHandlePtr &callout_handle, Pkt4Ptr &query, Pkt4Ptr &rsp, ConstSubnet4Ptr &subnet)
	Executes pkt4_send callout.

void	processPacketBufferSend (hooks::CalloutHandlePtr &callout_handle, Pkt4Ptr &rsp)
	Executes buffer4_send callout and sends the response.

static void	sanityCheck (const Pkt4Ptr &query)
	Verifies if specified packet meets RFC requirements.

static void	sanityCheck (const Pkt4Ptr &query, RequirementLevel serverid)
	Verifies if specified packet meets RFC requirements.

static void	appendServerID (Dhcpv4Exchange &ex)
	Adds server identifier option to the server's response.

static uint16_t	checkRelayPort (const Dhcpv4Exchange &ex)
	Check if the relay port RAI sub-option was set in the query.

static std::string	srvidToString (const OptionPtr &opt)
	converts server-id to text Converts content of server-id option to a text representation, e.g.

Additional Inherited Members
Protected Member Functions inherited from isc::process::Daemon
std::string	makePIDFileName () const
	Manufacture the pid file name.

Protected Attributes inherited from isc::process::Daemon
isc::asiolink::IOSignalSetPtr	signal_set_
	A pointer to the object installing custom signal handlers.

boost::posix_time::ptime	start_
	Timestamp of the start of the daemon.

Detailed Description

DHCPv4 server service.

This singleton class represents DHCPv4 server. It contains all top-level methods and routines necessary for server operation. In particular, it instantiates IfaceMgr, loads or generates DUID that is going to be used as server-identifier, receives incoming packets, processes them, manages leases assignment and generates appropriate responses.

This class does not support any controlling mechanisms directly. See the derived ControlledDhcpv4Srv class for support for command and configuration updates over msgq.

Definition at line 268 of file dhcp4_srv.h.

Member Enumeration Documentation

◆ RequirementLevel

enum isc::dhcp::Dhcpv4Srv::RequirementLevel

defines if certain option may, must or must not appear

Enumerator
FORBIDDEN
MANDATORY
OPTIONAL

Definition at line 277 of file dhcp4_srv.h.

Constructor & Destructor Documentation

◆ Dhcpv4Srv()

isc::dhcp::Dhcpv4Srv::Dhcpv4Srv	(	uint16_t	server_port = DHCP4_SERVER_PORT,
		uint16_t	client_port = 0,
		const bool	use_bcast = true,
		const bool	direct_response_desired = true )

Default constructor.

Instantiates necessary services, required to run DHCPv4 server. In particular, creates IfaceMgr that will be responsible for network interaction. Will instantiate lease manager, and load old or create new DUID. It is possible to specify alternate port on which DHCPv4 server will listen on and alternate port where DHCPv4 server sends all responses to. Those are mostly useful for testing purposes. The Last two arguments of the constructor should be left at default values for normal server operation. They should be set to 'false' when creating an instance of this class for unit testing because features they enable require root privileges.

Parameters

server_port	specifies port number to listen on
client_port	specifies port number to send to
use_bcast	configure sockets to support broadcast messages.
direct_response_desired	specifies if it is desired to use direct V4 traffic.

Todo: call loadLibraries() when handling configuration changes

Definition at line 662 of file dhcp4_srv.cc.

References alloc_engine_, isc::dhcp::DBG_DHCP4_START, isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_OPEN_SOCKET, isc::dhcp::DHCP4_SRV_CONSTRUCT_ERROR, isc::dhcp::DHCP4_TESTING_MODE_SEND_TO_SOURCE_ENABLED, isc::dhcp::IfaceMgr::instance(), LOG_DEBUG, LOG_ERROR, LOG_WARN, setPacketStatisticsDefaults(), and shutdown_.

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◆ ~Dhcpv4Srv()

isc::dhcp::Dhcpv4Srv::~Dhcpv4Srv ( )

virtual

Destructor. Used during DHCPv4 service shutdown.

Definition at line 724 of file dhcp4_srv.cc.

References isc::dhcp::HostMgr::create(), isc::dhcp::LeaseMgrFactory::destroy(), isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_SRV_D2STOP_ERROR, isc::dhcp::DHCP4_SRV_DHCP4O6_ERROR, isc::dhcp::DHCP4_SRV_UNLOAD_LIBRARIES_ERROR, discardPackets(), isc::hooks::HooksManager::getLibraryNames(), isc::dhcp::Dhcp4to6Ipc::instance(), isc::asiolink::IOServiceMgr::instance(), isc::dhcp::IfaceMgr::instance(), LOG_ERROR, isc::hooks::HooksManager::prepareUnloadLibraries(), stopD2(), and isc::hooks::HooksManager::unloadLibraries().

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Member Function Documentation

◆ accept()

bool isc::dhcp::Dhcpv4Srv::accept ( const Pkt4Ptr & query )

protected

Checks whether received message should be processed or discarded.

This function checks whether received message should be processed or discarded. It should be called on the beginning of message processing (just after the message has been decoded). This message calls a number of other functions which check whether message should be processed, using different criteria.

This function should be extended when new criteria for accepting received message have to be implemented. This function is meant to aggregate all early filtering checks on the received message. By having a single function like this, we are avoiding bloat of the server's main loop.

Warning: This function should remain exception safe.

Parameters

query Received message.

Returns: true if the message should be further processed, or false if the message should be discarded.

Definition at line 4567 of file dhcp4_srv.cc.

References acceptDirectRequest(), acceptMessageType(), acceptServerId(), isc::dhcp::bad_packet4_logger, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_PACKET_DROP_0002, isc::dhcp::DHCP4_PACKET_DROP_0003, and LOG_DEBUG.

Referenced by processPacket().

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◆ acceptDirectRequest()

bool isc::dhcp::Dhcpv4Srv::acceptDirectRequest ( const Pkt4Ptr & query )

protected

Check if a message sent by directly connected client should be accepted or discarded.

This function checks if the received message is from directly connected client. If it is, it checks that it should be processed or discarded.

Note that this function doesn't validate all addresses being carried in the message. The primary purpose of this function is to filter out direct messages in the local network for which there is no suitable subnet configured. For example, this function accepts unicast messages because unicasts may be used by clients located in remote networks to to renew existing leases. If their notion of address is wrong, the server will have to sent a NAK, instead of dropping the message. Detailed validation of such messages is performed at later stage of processing.

This function accepts the following messages:

all valid relayed messages,
all unicast messages,
all broadcast messages except DHCPINFORM received on the interface for which the suitable subnet exists (is configured).
all DHCPINFORM messages with source address or ciaddr set.

Parameters

query Message sent by a client.

Returns: true if message is accepted for further processing, false otherwise.

Definition at line 4595 of file dhcp4_srv.cc.

References isc::dhcp::DHCPINFORM, and selectSubnet().

Referenced by accept().

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◆ acceptMessageType()

bool isc::dhcp::Dhcpv4Srv::acceptMessageType ( const Pkt4Ptr & query ) const

protected

Check if received message type is valid for the server to process.

This function checks that the received message type belongs to the range of types recognized by the server and that the message of this type should be processed by the server.

The messages types accepted for processing are:

Discover
Request
Release
Decline
Inform

Parameters

query Message sent by a client.

Returns: true if message is accepted for further processing, false otherwise.

Definition at line 4633 of file dhcp4_srv.cc.

References isc::dhcp::bad_packet4_logger, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_PACKET_DROP_0004, isc::dhcp::DHCP4_PACKET_DROP_0005, isc::dhcp::DHCP4_PACKET_DROP_0006, isc::dhcp::DHCP4_PACKET_DROP_0009, isc::dhcp::DHCP_NOTYPE, isc::dhcp::DHCP_TYPES_EOF, isc::dhcp::DHCPDECLINE, isc::dhcp::DHCPDISCOVER, isc::dhcp::DHCPINFORM, isc::dhcp::DHCPRELEASE, isc::dhcp::DHCPREQUEST, and LOG_DEBUG.

Referenced by accept().

◆ acceptServerId()

bool isc::dhcp::Dhcpv4Srv::acceptServerId ( const Pkt4Ptr & pkt ) const

protected

Verifies if the server id belongs to our server.

This function checks if the server identifier carried in the specified DHCPv4 message belongs to this server. If the server identifier option is absent or the value carried by this option is equal to one of the server identifiers used by the server, the true is returned. If the server identifier option is present, but it doesn't match any server identifier used by this server, the false value is returned.

Parameters

pkt	DHCPv4 message which server identifier is to be checked.

Returns: true, if the server identifier is absent or matches one of the server identifiers that the server is using; false otherwise.

Todo: Currently we only check server identifiers configured at the subnet, shared network, client class and global levels. This should be sufficient for most of cases. At this point, trying to support server identifiers on the host reservations level seems to be an overkill and is probably not needed. In fact, at this point we don't know the reservations for the client communicating with the server. We may revise some of these choices in the future.

Definition at line 4689 of file dhcp4_srv.cc.

References DHCP4_OPTION_SPACE, isc::dhcp::DHO_DHCP_AGENT_OPTIONS, isc::dhcp::DHO_DHCP_SERVER_IDENTIFIER, isc::dhcp::IfaceMgr::instance(), isc::dhcp::CfgMgr::instance(), and isc::dhcp::RAI_OPTION_SERVER_ID_OVERRIDE.

Referenced by accept().

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◆ adjustIfaceData()

void isc::dhcp::Dhcpv4Srv::adjustIfaceData ( Dhcpv4Exchange & ex )

protected

Set IP/UDP and interface parameters for the DHCPv4 response.

This method sets the following parameters for the DHCPv4 message being sent to a client:

client unicast or a broadcast address,
client or relay port,
server address,
server port,
name and index of the interface which is to be used to send the message.

Internally it calls the Dhcpv4Srv::adjustRemoteAddr to figure out the destination address (client unicast address or broadcast address).

The destination port is always DHCPv4 client (68) or relay (67) port, depending if the response will be sent directly to a client, unless a client port was enforced from the command line.

The source port is always set to DHCPv4 server port (67).

The interface selected for the response is always the same as the one through which the query has been received.

The source address for the response is the IPv4 address assigned to the interface being used to send the response. This function uses IfaceMgr to get the socket bound to the IPv4 address on the particular interface.

Note: This method is static because it is not dependent on the class state.

Parameters

ex	The exchange holding both the client's message and the server's response.

Todo: Consider an optimization that we use local address from the query if this address is not broadcast.

Definition at line 3484 of file dhcp4_srv.cc.

References adjustRemoteAddr(), checkRelayPort(), client_port_, isc::dhcp::DHCPINFORM, isc::dhcp::IfaceMgr::instance(), isc::dhcp::CfgMgr::instance(), isc::asiolink::IOAddress::IPV4_ZERO_ADDRESS(), server_port_, isc::dhcp::CfgIface::SOCKET_UDP, and isc::dhcp::CfgIface::USE_ROUTING.

Referenced by processDiscover(), processInform(), and processRequest().

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◆ adjustRemoteAddr()

void isc::dhcp::Dhcpv4Srv::adjustRemoteAddr ( Dhcpv4Exchange & ex )

protected

Sets remote addresses for outgoing packet.

This method sets the local and remote addresses on outgoing packet. The addresses being set depend on the following conditions:

has incoming packet been relayed,
is direct response to a client without address supported,
type of the outgoing packet,
broadcast flag set in the incoming packet.

Warning: This method does not check whether provided packet pointers are valid. Make sure that pointers are correct before calling this function.

Parameters

ex	The exchange holding both the client's message and the server's response.

Definition at line 3572 of file dhcp4_srv.cc.

References isc::dhcp::DHCPINFORM, isc::dhcp::DHCPNAK, isc::dhcp::Pkt4::FLAG_BROADCAST_MASK, getSendResponsesToSource(), isc::dhcp::IfaceMgr::instance(), and isc::asiolink::IOAddress::IPV4_BCAST_ADDRESS().

Referenced by adjustIfaceData().

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◆ appendBasicOptions()

void isc::dhcp::Dhcpv4Srv::appendBasicOptions ( Dhcpv4Exchange & ex )

protected

Append basic options if they are not present.

This function adds the following basic options if they are not yet added to the response message:

Subnet Mask,
Router,
Name Server,
Domain Name,
Server Identifier.

Parameters

ex	DHCPv4 exchange holding the client's message to be checked.

Definition at line 2496 of file dhcp4_srv.cc.

References DHCP4_OPTION_SPACE, isc::dhcp::DHO_DHCP_SERVER_IDENTIFIER, isc::dhcp::DHO_DOMAIN_NAME, isc::dhcp::DHO_DOMAIN_NAME_SERVERS, and isc::dhcp::DHO_ROUTERS.

Referenced by processDiscover(), processInform(), and processRequest().

◆ appendRequestedOptions()

void isc::dhcp::Dhcpv4Srv::appendRequestedOptions ( Dhcpv4Exchange & ex )

protected

Appends options requested by client.

This method assigns options that were requested by client (sent in PRL) or are enforced by server.

Parameters

ex	The exchange holding both the client's message and the server's response.

Definition at line 2152 of file dhcp4_srv.cc.

References DHCP4_OPTION_SPACE, isc::dhcp::DHO_DHCP_PARAMETER_REQUEST_LIST, isc::dhcp::DHO_VIVCO_SUBOPTIONS, isc::dhcp::DHO_VIVSO_SUBOPTIONS, and isc::dhcp::Option::V4.

Referenced by processDiscover(), processInform(), and processRequest().

◆ appendRequestedVendorOptions()

void isc::dhcp::Dhcpv4Srv::appendRequestedVendorOptions ( Dhcpv4Exchange & ex )

protected

Appends requested vendor options as requested by client.

This method is similar to appendRequestedOptions(), but uses vendor options. The major difference is that vendor-options use its own option spaces (there may be more than one distinct set of vendor options, each with unique vendor-id). Vendor options are requested using separate options within their respective vendor-option spaces.

Parameters

ex	The exchange holding both the client's message and the server's response.

Definition at line 2324 of file dhcp4_srv.cc.

References isc::dhcp::DHO_VIVCO_SUBOPTIONS, isc::dhcp::DHO_VIVSO_SUBOPTIONS, DOCSIS3_V4_ORO, isc::dhcp::Option::V4, and VENDOR_ID_CABLE_LABS.

Referenced by processDiscover(), processInform(), and processRequest().

◆ appendServerID()

void isc::dhcp::Dhcpv4Srv::appendServerID ( Dhcpv4Exchange & ex )

staticprotected

Adds server identifier option to the server's response.

This method adds a server identifier to the DHCPv4 message if it doesn't exist yet. This is set to the local address on which the client's query has been received with the exception of broadcast traffic and DHCPv4o6 query for which a socket on the particular interface is found and its address is used as server id.

Note: This method doesn't throw exceptions by itself but the underlying classes being used my throw. The reason for this method to not sanity check the specified message is that it is meant to be called internally by the Dhcpv4Srv class.; This method is static because it is not dependent on the class state.

Parameters

ex	The exchange holding both the client's message and the server's response.

Definition at line 2053 of file dhcp4_srv.cc.

References isc::dhcp::DHO_DHCP_SERVER_IDENTIFIER, isc::dhcp::LibDHCP::DHO_DHCP_SERVER_IDENTIFIER_DEF(), isc::dhcp::IfaceMgr::instance(), and isc::dhcp::Option::V4.

Referenced by processDiscover(), processInform(), and processRequest().

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◆ assignLease()

void isc::dhcp::Dhcpv4Srv::assignLease ( Dhcpv4Exchange & ex )

protected

Assigns a lease and appends corresponding options.

This method chooses the most appropriate lease for requesting client and assigning it. Options corresponding to the lease are added to specific message.

This method may reset the pointer to the response in the ex object to indicate that the response should not be sent to the client. The caller must check if the response is is null after calling this method.

The response type in the ex object may be set to DHCPACK or DHCPNAK.

Parameters

ex	DHCPv4 exchange holding the client's message to be checked.

Todo: The server should check what ciaddr the client has supplied in ciaddr. Currently the ciaddr is ignored except for the subnet selection. If the client supplied an invalid address, the server will also return an invalid address here.

Definition at line 2945 of file dhcp4_srv.cc.

References alloc_engine_, assignZero(), isc::dhcp::CfgGlobals::AUTHORITATIVE, isc::dhcp::bad_packet4_logger, isc::data::Element::boolean, createNameChangeRequests(), isc::dhcp::DBG_DHCP4_BASIC_DATA, isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::ddns4_logger, isc::dhcp::DHCP4_CLIENTID_IGNORED_FOR_LEASES, isc::dhcp::DHCP4_DISCOVER, isc::dhcp::DHCP4_INIT_REBOOT, isc::dhcp::DHCP4_LEASE_ALLOC, isc::dhcp::DHCP4_LEASE_OFFER, isc::dhcp::DHCP4_LEASE_REUSE, isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_NCR_CREATION_FAILED, isc::dhcp::DHCP4_NO_LEASE_INIT_REBOOT, isc::dhcp::DHCP4_PACKET_NAK_0001, isc::dhcp::DHCP4_PACKET_NAK_0002, isc::dhcp::DHCP4_PACKET_NAK_0003, isc::dhcp::DHCP4_PACKET_NAK_0004, isc::dhcp::DHCP4_REQUEST, isc::dhcp::DHCP4_SUBNET_DYNAMICALLY_CHANGED, isc::dhcp::DHCP4_UNKNOWN_ADDRESS_REQUESTED, isc::dhcp::DHCPDISCOVER, isc::dhcp::DHCPNAK, isc::dhcp::DHO_DHCP_LEASE_TIME, isc::dhcp::DHO_DHCP_PARAMETER_REQUEST_LIST, isc::dhcp::DHO_DHCP_REQUESTED_ADDRESS, isc::dhcp::DHO_DHCP_SERVER_IDENTIFIER, isc::dhcp::DHO_FQDN, isc::dhcp::DHO_HOST_NAME, isc::dhcp::DHO_V6_ONLY_PREFERRED, isc::stats::StatsMgr::generateName(), isc::dhcp::getCalloutHandle(), isc::dhcp::AllocEngine::getValidLft(), isc::dhcp::CfgMgr::instance(), isc::dhcp::LeaseMgrFactory::instance(), isc::stats::StatsMgr::instance(), isc::asiolink::IOAddress::IPV4_ZERO_ADDRESS(), isc::dhcp::lease4_logger, isc::dhcp::Lease::lifetimeToText(), LOG_DEBUG, LOG_ERROR, LOG_INFO, isc::dhcp::packet4_logger, postAllocateNameUpdate(), processClientName(), setTeeTimes(), isc::dhcp::Lease::TYPE_V4, and isc::dhcp::Option::V4.

Referenced by processDiscover(), and processRequest().

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◆ assignZero()

bool isc::dhcp::Dhcpv4Srv::assignZero	(	ConstSubnet4Ptr &	subnet,
		const ClientClasses &	client_classes )

protected

Assign the 0.0.0.0 address to an IPv6-Only client.

Note: In fact there is no difference between assigning no address or assigning the zero address as the assigned address is the Yiaddr field of the DHCPv4 message header...

Check if there is a subnet or shared network defining an IPv6-Only Preferred option which will be included by the response.

Parameters

subnet	Reference to the selected subnet, can be modified if the option is found in another subnet of the shared network.
client_classes	Client classes.

Returns: true if an IPv6-Only Preferred option was found, false otherwise.

Definition at line 2912 of file dhcp4_srv.cc.

References DHCP4_OPTION_SPACE, and isc::dhcp::DHO_V6_ONLY_PREFERRED.

Referenced by assignLease().

◆ buildCfgOptionList()

void isc::dhcp::Dhcpv4Srv::buildCfgOptionList ( Dhcpv4Exchange & ex )

protected

Build the configured option list.

Note: The configured option list is an ordered list of CfgOption objects used to append options to the response.

Parameters

ex	The exchange where the configured option list is cached

Definition at line 2078 of file dhcp4_srv.cc.

References isc::dhcp::DBG_DHCP4_BASIC, isc::dhcp::DHCP4_CLASS_UNCONFIGURED, isc::dhcp::dhcp4_logger, isc::dhcp::CfgMgr::instance(), isc::asiolink::IOAddress::IPV4_ZERO_ADDRESS(), isc::dhcp::isClientClassBuiltIn(), isc::asiolink::IOAddress::isV4Zero(), LOG_DEBUG, and isc::dhcp::Lease::TYPE_V4.

Referenced by processDiscover(), processInform(), and processRequest().

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◆ checkRelayPort()

uint16_t isc::dhcp::Dhcpv4Srv::checkRelayPort ( const Dhcpv4Exchange & ex )

staticprotected

Check if the relay port RAI sub-option was set in the query.

Parameters

ex	The exchange holding the client's message

Returns: the port to use to join the relay or 0 for the default

Definition at line 3471 of file dhcp4_srv.cc.

References isc::dhcp::DHO_DHCP_AGENT_OPTIONS, and isc::dhcp::RAI_OPTION_RELAY_PORT.

Referenced by adjustIfaceData().

◆ classifyPacket()

void isc::dhcp::Dhcpv4Srv::classifyPacket ( const Pkt4Ptr & pkt )

protected

Assigns incoming packet to zero or more classes.

Note: This is done in two phases: first the content of the vendor-class-identifier option is used as a class, by calling (private) classifyByVendor(). Second classification match expressions are evaluated. The resulting classes will be stored in the packet (see isc::dhcp::Pkt4::classes_ and isc::dhcp::Pkt4::inClass).

Parameters

pkt	packet to be classified

Definition at line 4892 of file dhcp4_srv.cc.

References isc::dhcp::Dhcpv4Exchange::classifyPacket().

Referenced by processPacket().

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◆ createNameChangeRequests()

void isc::dhcp::Dhcpv4Srv::createNameChangeRequests	(	const Lease4Ptr &	lease,
		const Lease4Ptr &	old_lease,
		const DdnsParams &	ddns_params )

protected

Creates NameChangeRequests which correspond to the lease which has been acquired.

If this function is called when an existing lease is renewed, it may generate NameChangeRequest to remove existing DNS entries which correspond to the old lease instance. This function may cease to generate NameChangeRequests if the notion of the client's FQDN hasn't changed between an old and new lease.

Parameters

lease	A pointer to the new lease which has been acquired.
old_lease	A pointer to the instance of the old lease which has
ddns_params	DDNS configuration parameters been replaced by the new lease passed in the first argument. The null value indicates that the new lease has been allocated, rather than lease being renewed.

Definition at line 2883 of file dhcp4_srv.cc.

References isc::dhcp_ddns::CHG_ADD, isc::dhcp_ddns::CHG_REMOVE, isc_throw, and isc::dhcp::queueNCR().

Referenced by assignLease().

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◆ d2ClientErrorHandler()

void isc::dhcp::Dhcpv4Srv::d2ClientErrorHandler	(	const dhcp_ddns::NameChangeSender::Result	result,
		dhcp_ddns::NameChangeRequestPtr &	ncr )

virtual

Implements the error handler for DHCP_DDNS IO errors.

Invoked when a NameChangeRequest send to kea-dhcp-ddns completes with a failed status. These are communications errors, not data related failures.

This method logs the failure and then suspends all further updates. Updating can only be restored by reconfiguration or restarting the server. There is currently no retry logic so the first IO error that occurs will suspend updates.

Todo: We may wish to make this more robust or sophisticated.

Parameters

result	Result code of the send operation.
ncr	NameChangeRequest which failed to send.

Todo: We may wish to revisit this, but for now we will simply turn them off.

Definition at line 5078 of file dhcp4_srv.cc.

References isc::dhcp::ddns4_logger, isc::dhcp::DHCP4_DDNS_REQUEST_SEND_FAILED, isc::dhcp::CfgMgr::instance(), and LOG_ERROR.

Referenced by startD2().

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◆ declineLease()

void isc::dhcp::Dhcpv4Srv::declineLease	(	const Lease4Ptr &	lease,
		const Pkt4Ptr &	decline,
		AllocEngine::ClientContext4Ptr &	context )

Marks lease as declined.

This method moves a lease to declined state with all the steps involved:

trigger DNS removal (if necessary)
disassociate the client information
update lease in the database (switch to DECLINED state)
increase necessary statistics
call lease4_decline hook

Parameters

lease	lease to be declined
decline	client's message
context	reference to a client context

Definition at line 4203 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp_ddns::CHG_REMOVE, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_DECLINE_FAIL, isc::dhcp::DHCP4_DECLINE_LEASE, isc::dhcp::DHCP4_HOOK_DECLINE_SKIP, isc::stats::StatsMgr::generateName(), isc::dhcp::getCalloutHandle(), Hooks, isc::hooks::hooks_logger, isc::dhcp::CfgMgr::instance(), isc::dhcp::LeaseMgrFactory::instance(), isc::stats::StatsMgr::instance(), isc::dhcp::lease4_logger, LOG_DEBUG, LOG_ERROR, LOG_INFO, isc::hooks::CalloutHandle::NEXT_STEP_DROP, isc::hooks::CalloutHandle::NEXT_STEP_SKIP, isc::dhcp::queueNCR(), and isc::dhcp::Lease::TYPE_V4.

Referenced by processDecline().

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◆ deferredUnpack()

void isc::dhcp::Dhcpv4Srv::deferredUnpack ( Pkt4Ptr & query )

protected

Perform deferred option unpacking.

Note: Options 43 and 224-254 are processed after classification. If a class configures a definition it is applied, if none the global (user) definition is applied. For option 43 a last resort definition (same definition as used in previous Kea versions) is applied when none is found.

Parameters

query Pointer to the client message.

Definition at line 4982 of file dhcp4_srv.cc.

References isc::dhcp::bad_packet4_logger, isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::DHCP4_DEFERRED_OPTION_MISSING, isc::dhcp::DHCP4_DEFERRED_OPTION_UNPACK_FAIL, DHCP4_OPTION_SPACE, isc::dhcp::LibDHCP::getLastResortOptionDef(), isc::dhcp::LibDHCP::getOptionDef(), isc::dhcp::LibDHCP::getRuntimeOptionDef(), isc::dhcp::CfgMgr::instance(), LOG_DEBUG, and isc::dhcp::Option::V4.

Referenced by processPacket().

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◆ discardPackets()

void isc::dhcp::Dhcpv4Srv::discardPackets ( )

Discards parked packets Clears the packet parking lots of all packets.

Called during reconfigure and shutdown.

Definition at line 5223 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::clearParkingLots().

Referenced by ~Dhcpv4Srv().

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◆ earlyGHRLookup()

bool isc::dhcp::Dhcpv4Srv::earlyGHRLookup	(	const Pkt4Ptr &	query,
		AllocEngine::ClientContext4Ptr	ctx )

Initialize client context and perform early global reservations lookup.

Parameters

query	The query message.
ctx	Pointer to client context.

Returns: true if processing can continue, false if the query must be dropped.

Definition at line 1099 of file dhcp4_srv.cc.

References alloc_engine_, isc::dhcp::DBG_DHCP4_BASIC, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_CLASS_ASSIGNED, isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_PACKET_DROP_0014, isc::dhcp::CfgGlobals::EARLY_GLOBAL_RESERVATIONS_LOOKUP, isc::dhcp::Dhcpv4Exchange::evaluateClasses(), initContext0(), isc::dhcp::CfgMgr::instance(), isc::stats::StatsMgr::instance(), LOG_DEBUG, isc::dhcp::packet4_logger, isc::dhcp::Dhcpv4Exchange::removeDependentEvaluatedClasses(), and isc::dhcp::Dhcpv4Exchange::setHostIdentifiers().

Referenced by processDhcp4Query().

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◆ evaluateAdditionalClasses()

void isc::dhcp::Dhcpv4Srv::evaluateAdditionalClasses ( Dhcpv4Exchange & ex )

protected

Evaluates classes in the additional classes lists.

The evaluation takes place after all other classification and lease assignment. It evaluates all classes in the packet's additional classes list plus any contributed via evaluate-additional-classes lists.

Note: Evaluates all classes which were marked for the additional evaluation stage. Classes are collected and evaluated in the following order: pool, subnet, shared-network to produce option precedence pool over subnet over shared-network.; The only-in-additional-list flag is related because it avoids double evaluation (which is not forbidden).

Parameters

ex	The exchange holding needed information.

Definition at line 4896 of file dhcp4_srv.cc.

References isc::dhcp::DBG_DHCP4_BASIC, isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::DHCP4_ADDITIONAL_CLASS_EVAL_ERROR, isc::dhcp::DHCP4_ADDITIONAL_CLASS_EVAL_RESULT, isc::dhcp::DHCP4_ADDITIONAL_CLASS_NO_TEST, isc::dhcp::DHCP4_ADDITIONAL_CLASS_UNDEFINED, isc::dhcp::dhcp4_logger, isc::dhcp::evaluateBool(), isc::dhcp::ClientClasses::insert(), isc::dhcp::CfgMgr::instance(), isc::asiolink::IOAddress::IPV4_ZERO_ADDRESS(), isc::asiolink::IOAddress::isV4Zero(), LOG_DEBUG, LOG_ERROR, and isc::dhcp::Lease::TYPE_V4.

Referenced by processDiscover(), processInform(), and processRequest().

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◆ getCBControl()

CBControlDHCPv4Ptr isc::dhcp::Dhcpv4Srv::getCBControl ( ) const

inline

Returns an object which controls access to the configuration backends.

Returns: Pointer to the instance of the object which controls access to the configuration backends.

Definition at line 333 of file dhcp4_srv.h.

References cb_control_.

◆ getHookIndexBuffer4Receive()

int isc::dhcp::Dhcpv4Srv::getHookIndexBuffer4Receive ( )

static

Returns the index for "buffer4_receive" hook point.

Returns: the index for "buffer4_receive" hook point

Definition at line 5195 of file dhcp4_srv.cc.

References Hooks.

◆ getHookIndexBuffer4Send()

int isc::dhcp::Dhcpv4Srv::getHookIndexBuffer4Send ( )

static

Returns the index for "buffer4_send" hook point.

Returns: the index for "buffer4_send" hook point

Definition at line 5215 of file dhcp4_srv.cc.

References Hooks.

Referenced by isc::dhcp::Dhcp4to6Ipc::handler().

◆ getHookIndexLease4Decline()

int isc::dhcp::Dhcpv4Srv::getHookIndexLease4Decline ( )

static

Returns the index for "lease4_decline" hook point.

Returns: the index for "lease4_decline" hook point

Definition at line 5219 of file dhcp4_srv.cc.

References Hooks.

◆ getHookIndexLease4Release()

int isc::dhcp::Dhcpv4Srv::getHookIndexLease4Release ( )

static

Returns the index for "lease4_release" hook point.

Returns: the index for "lease4_release" hook point

Definition at line 5207 of file dhcp4_srv.cc.

References Hooks.

◆ getHookIndexPkt4Receive()

int isc::dhcp::Dhcpv4Srv::getHookIndexPkt4Receive ( )

static

Returns the index for "pkt4_receive" hook point.

Returns: the index for "pkt4_receive" hook point

Definition at line 5199 of file dhcp4_srv.cc.

References Hooks.

◆ getHookIndexPkt4Send()

int isc::dhcp::Dhcpv4Srv::getHookIndexPkt4Send ( )

static

Returns the index for "pkt4_send" hook point.

Returns: the index for "pkt4_send" hook point

Definition at line 5211 of file dhcp4_srv.cc.

References Hooks.

◆ getHookIndexSubnet4Select()

int isc::dhcp::Dhcpv4Srv::getHookIndexSubnet4Select ( )

static

Returns the index for "subnet4_select" hook point.

Returns: the index for "subnet4_select" hook point

Definition at line 5203 of file dhcp4_srv.cc.

References Hooks.

◆ getIOService()

asiolink::IOServicePtr & isc::dhcp::Dhcpv4Srv::getIOService ( )

inline

Returns pointer to the IO service used by the server.

Definition at line 319 of file dhcp4_srv.h.

Referenced by isc::dhcp::ControlledDhcpv4Srv::ControlledDhcpv4Srv(), isc::dhcp::ControlledDhcpv4Srv::cleanup(), isc::dhcp::ControlledDhcpv4Srv::init(), run(), and isc::dhcp::ControlledDhcpv4Srv::shutdownServer().

◆ getNetworkState()

NetworkStatePtr & isc::dhcp::Dhcpv4Srv::getNetworkState ( )

inline

Returns pointer to the network state used by the server.

Definition at line 324 of file dhcp4_srv.h.

References network_state_.

◆ getSendResponsesToSource()

bool isc::dhcp::Dhcpv4Srv::getSendResponsesToSource ( ) const

inline

Returns value of the test_send_responses_to_source_ flag.

Returns: value of the test_send_responses_to_source_ flag.

Definition at line 509 of file dhcp4_srv.h.

Referenced by adjustRemoteAddr().

◆ getServerPort()

uint16_t isc::dhcp::Dhcpv4Srv::getServerPort ( ) const

Get UDP port on which server should listen.

Typically, server listens on UDP port number 67. Other ports are used for testing purposes only.

Returns: UDP port on which server should listen.

Definition at line 5228 of file dhcp4_srv.cc.

References server_port_.

◆ getVersion()

std::string isc::dhcp::Dhcpv4Srv::getVersion ( bool extended )

static

returns Kea version on stdout and exit.

redeclaration/redefinition. isc::process::Daemon::getVersion()

Definition at line 5090 of file dhcp4_srv.cc.

References isc::dhcp::HostDataSourceFactory::getDBVersions(), isc::dhcp::LeaseMgrFactory::getDBVersions(), isc::cryptolink::CryptoLink::getVersion(), isc::log::Logger::getVersion(), isc::db::info, and version().

Referenced by main().

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◆ initContext0()

void isc::dhcp::Dhcpv4Srv::initContext0	(	const Pkt4Ptr &	query,
		AllocEngine::ClientContext4Ptr	ctx )

Initialize client context (first part).

Parameters

query	The query message.
ctx	Pointer to client context.

Definition at line 1089 of file dhcp4_srv.cc.

Referenced by earlyGHRLookup(), and processLocalizedQuery4AndSendResponse().

◆ inTestMode()

bool isc::dhcp::Dhcpv4Srv::inTestMode ( ) const

inline

Checks if the server is running in unit test mode.

Returns: true if the server is running in unit test mode, false otherwise.

Definition at line 314 of file dhcp4_srv.h.

References server_port_.

◆ jsonPathsToRedact()

std::list< std::list< std::string > > isc::dhcp::Dhcpv4Srv::jsonPathsToRedact ( ) const

finaloverridevirtual

Return a list of all paths that contain passwords or secrets for kea-dhcp4.

Returns: the list of lists of sequential JSON map keys needed to reach the passwords and secrets.

Reimplemented from isc::process::Daemon.

Definition at line 5263 of file dhcp4_srv.cc.

◆ postAllocateNameUpdate()

void isc::dhcp::Dhcpv4Srv::postAllocateNameUpdate	(	const AllocEngine::ClientContext4Ptr &	ctx,
		const Lease4Ptr &	lease,
		const Pkt4Ptr &	query,
		const Pkt4Ptr &	resp,
		bool	client_name_changed )

protected

Update client name and DNS flags in the lease and response.

There are two cases when the client name (FQDN or hostname) and DNS flags need to updated after the lease has been allocated:

If the name is being generated from the lease address
If the allocation changed the chosen subnet

In the first case this function will generate the name from the lease address. In either case, the name and DNS flags are updated in the lease and in the response packet.

Parameters

ctx	reference to the client context
lease	reference to the client lease
query	reference to the client query
resp	reference to the client response
client_name_changed	- true if the new values are already in the lease

TKM - do this on committed-discover

Definition at line 3364 of file dhcp4_srv.cc.

References isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::ddns4_logger, isc::dhcp::DHCP4_POST_ALLOCATION_NAME_UPDATE_FAIL, isc::dhcp::DHCP4_RESPONSE_HOSTNAME_GENERATE, isc::dhcp::DHO_FQDN, isc::dhcp::DHO_HOST_NAME, isc::dhcp::Option4ClientFqdn::FULL, isc::dhcp::CfgMgr::instance(), isc::dhcp::LeaseMgrFactory::instance(), LOG_DEBUG, and LOG_ERROR.

Referenced by assignLease().

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◆ processClientName()

void isc::dhcp::Dhcpv4Srv::processClientName ( Dhcpv4Exchange & ex )

protected

Processes Client FQDN and Hostname Options sent by a client.

Client may send Client FQDN or Hostname option to communicate its name to the server. Server may use this name to perform DNS update for the lease being assigned to a client. If server takes responsibility for updating DNS for a client it may communicate it by sending the Client FQDN or Hostname Option back to the client. Server select a different name than requested by a client to update DNS. In such case, the server stores this different name in its response.

Client should not send both Client FQDN and Hostname options. However, if client sends both options, server should prefer Client FQDN option and ignore the Hostname option. If Client FQDN option is not present, the Hostname option is processed.

The Client FQDN Option is processed by this function as described in RFC4702.

In response to a Hostname Option sent by a client, the server may send Hostname option with the same or different hostname. If different hostname is sent, it is an indication to the client that server has overridden the client's preferred name and will rather use this different name to update DNS. However, since Hostname option doesn't carry an information whether DNS update will be carried by the server or not, the client is responsible for checking whether DNS update has been performed.

After successful processing options stored in the first parameter, this function may add Client FQDN or Hostname option to the response message. In some cases, server may cease to add any options to the response, i.e. when server doesn't support DNS updates.

This function does not throw. It simply logs the debug message if the processing of the FQDN or Hostname failed.

Parameters

ex	The exchange holding both the client's message and the server's response.

Todo: It could be configurable what sort of updates the server is doing when Hostname option was sent.

Definition at line 2538 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::DBG_DHCP4_DETAIL_DATA, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::ddns4_logger, isc::dhcp::DHCP4_CLIENT_FQDN_PROCESS, isc::dhcp::DHCP4_CLIENT_HOSTNAME_PROCESS, isc::dhcp::DHCP4_CLIENT_NAME_PROC_FAIL, isc::dhcp::DHCP4_HOOK_DDNS_UPDATE, isc::dhcp::DHO_FQDN, isc::dhcp::DHO_HOST_NAME, isc::dhcp::Option4ClientFqdn::FLAG_N, isc::dhcp::Option4ClientFqdn::FLAG_S, isc::dhcp::Option4ClientFqdn::FULL, isc::dhcp::getCalloutHandle(), Hooks, isc::hooks::hooks_logger, isc::dhcp::CfgMgr::instance(), and LOG_DEBUG.

Referenced by assignLease().

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◆ processDecline()

void isc::dhcp::Dhcpv4Srv::processDecline	(	Pkt4Ptr &	decline,
		AllocEngine::ClientContext4Ptr &	context )

protected

Process incoming DHCPDECLINE messages.

This method processes incoming DHCPDECLINE. In particular, it extracts Requested IP Address option, checks that the address really belongs to the client and if it does, calls declineLease.

Parameters

decline	message received from client
context	pointer to the client context where declined lease is stored.

Definition at line 4129 of file dhcp4_srv.cc.

References declineLease(), isc::dhcp::DHCP4_DECLINE_LEASE_MISMATCH, isc::dhcp::DHCP4_DECLINE_LEASE_NOT_FOUND, isc::dhcp::dhcp4_logger, isc::dhcp::DHO_DHCP_REQUESTED_ADDRESS, isc::dhcp::LeaseMgrFactory::instance(), isc_throw, LOG_WARN, isc::dhcp::Lease::STATE_DEFAULT, and isc::asiolink::IOAddress::toText().

Referenced by processLocalizedQuery4().

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◆ processDhcp4Query()

Pkt4Ptr isc::dhcp::Dhcpv4Srv::processDhcp4Query	(	Pkt4Ptr	query,
		bool	allow_answer_park )

Process a single incoming DHCPv4 query.

It localizes the query, calls per-type processXXX methods, generates appropriate answer.

Parameters

query	A pointer to the packet to be processed.
allow_answer_park	Indicates if parking a packet is allowed.

Returns: A pointer to the response.

Definition at line 1539 of file dhcp4_srv.cc.

References isc::dhcp::bad_packet4_logger, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_PACKET_DROP_0007, isc::dhcp::DHCPDECLINE, isc::dhcp::DHCPDISCOVER, isc::dhcp::DHCPINFORM, isc::dhcp::DHCPRELEASE, isc::dhcp::DHCPREQUEST, earlyGHRLookup(), isc::stats::StatsMgr::instance(), isc::util::MultiThreadingMgr::instance(), LOG_DEBUG, isc::dhcp::makeContinuation(), processDhcp4QueryAndSendResponse(), processLocalizedQuery4(), sanityCheck(), and selectSubnet().

Referenced by processDhcp4QueryAndSendResponse(), and processPacket().

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◆ processDhcp4QueryAndSendResponse()

void isc::dhcp::Dhcpv4Srv::processDhcp4QueryAndSendResponse	(	Pkt4Ptr	query,
		bool	allow_answer_park )

Process a single incoming DHCPv4 query.

It localizes the query, calls per-type processXXX methods, generates appropriate answer, sends the answer to the client.

Parameters

query	A pointer to the packet to be processed.
allow_answer_park	Indicates if parking a packet is allowed.

Definition at line 1519 of file dhcp4_srv.cc.

References isc::dhcp::DHCP4_PACKET_PROCESS_EXCEPTION, isc::dhcp::DHCP4_PACKET_PROCESS_STD_EXCEPTION, isc::dhcp::getCalloutHandle(), LOG_ERROR, isc::dhcp::packet4_logger, processDhcp4Query(), and processPacketBufferSend().

Referenced by processDhcp4Query().

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◆ processDiscover()

Pkt4Ptr isc::dhcp::Dhcpv4Srv::processDiscover	(	Pkt4Ptr &	discover,
		AllocEngine::ClientContext4Ptr &	context )

protected

Processes incoming DISCOVER and returns response.

Processes received DISCOVER message and verifies that its sender should be served. In particular, a lease is selected and sent as an offer to a client if it should be served.

Parameters

discover	DISCOVER message received from client
context	pointer to the client context

Returns: OFFER message or null

Definition at line 3815 of file dhcp4_srv.cc.

References adjustIfaceData(), alloc_engine_, appendBasicOptions(), appendRequestedOptions(), appendRequestedVendorOptions(), appendServerID(), assignLease(), buildCfgOptionList(), isc::dhcp::DBG_DHCP4_BASIC, isc::dhcp::DHCP4_CLASSES_ASSIGNED, isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_V6_ONLY_PREFERRED_MISSING_IN_OFFER, isc::dhcp::DHO_V6_ONLY_PREFERRED, evaluateAdditionalClasses(), isc::util::MultiThreadingMgr::instance(), LOG_DEBUG, LOG_ERROR, isc::dhcp::packet4_logger, and setFixedFields().

Referenced by processLocalizedQuery4().

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◆ processInform()

Pkt4Ptr isc::dhcp::Dhcpv4Srv::processInform	(	Pkt4Ptr &	inform,
		AllocEngine::ClientContext4Ptr &	context )

protected

Processes incoming DHCPINFORM messages.

Parameters

inform	message received from client
context	pointer to the client context

Returns: DHCPACK to be sent to the client.

Definition at line 4429 of file dhcp4_srv.cc.

References adjustIfaceData(), alloc_engine_, appendBasicOptions(), appendRequestedOptions(), appendRequestedVendorOptions(), appendServerID(), buildCfgOptionList(), isc::dhcp::DBG_DHCP4_BASIC, isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::DHCP4_CLASSES_ASSIGNED, isc::dhcp::DHCP4_INFORM_DIRECT_REPLY, isc::dhcp::dhcp4_logger, isc::dhcp::DHO_DHCP_AGENT_OPTIONS, evaluateAdditionalClasses(), isc::asiolink::IOAddress::IPV4_ZERO_ADDRESS(), LOG_DEBUG, isc::dhcp::packet4_logger, and setFixedFields().

Referenced by processLocalizedQuery4().

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◆ processLocalizedQuery4()

Pkt4Ptr isc::dhcp::Dhcpv4Srv::processLocalizedQuery4	(	AllocEngine::ClientContext4Ptr &	ctx,
		bool	allow_answer_park )

Process a localized incoming DHCPv4 query.

It calls per-type processXXX methods, generates appropriate answer.

Parameters

ctx	Pointer to The client context.
allow_answer_park	Indicates if parking a packet is allowed.

Returns: A pointer to the response.

Definition at line 1636 of file dhcp4_srv.cc.

References isc::dhcp::bad_packet4_logger, isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp::DBG_DHCP4_HOOKS, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_HOOK_LEASE4_OFFER_ARGUMENT_MISSING, isc::dhcp::DHCP4_HOOK_LEASE4_OFFER_DROP, isc::dhcp::DHCP4_HOOK_LEASE4_OFFER_PARK, isc::dhcp::DHCP4_HOOK_LEASE4_OFFER_PARKING_LOT_FULL, isc::dhcp::DHCP4_HOOK_LEASES4_COMMITTED_DROP, isc::dhcp::DHCP4_HOOK_LEASES4_COMMITTED_PARK, isc::dhcp::DHCP4_HOOK_LEASES4_COMMITTED_PARKING_LOT_FULL, isc::dhcp::DHCP4_PACKET_DROP_0007, isc::dhcp::DHCPDECLINE, isc::dhcp::DHCPDISCOVER, isc::dhcp::DHCPINFORM, isc::dhcp::DHCPRELEASE, isc::dhcp::DHCPREQUEST, isc::hooks::HooksManager::drop(), isc::dhcp::getCalloutHandle(), Hooks, isc::hooks::hooks_logger, isc::stats::StatsMgr::instance(), isc::util::MultiThreadingMgr::instance(), isc_throw, LOG_DEBUG, LOG_ERROR, isc::hooks::CalloutHandle::NEXT_STEP_DROP, isc::hooks::CalloutHandle::NEXT_STEP_PARK, isc::dhcp::packet4_logger, isc::hooks::HooksManager::park(), processDecline(), processDiscover(), processInform(), processPacketBufferSend(), processPacketPktSend(), processRelease(), processRequest(), sendResponseNoThrow(), serverDecline(), and serverDeclineNoThrow().

Referenced by processDhcp4Query(), and processLocalizedQuery4AndSendResponse().

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◆ processLocalizedQuery4AndSendResponse() [1/2]

void isc::dhcp::Dhcpv4Srv::processLocalizedQuery4AndSendResponse	(	Pkt4Ptr	query,
		AllocEngine::ClientContext4Ptr &	ctx,
		bool	allow_answer_park )

Process a localized incoming DHCPv4 query.

It calls per-type processXXX methods, generates appropriate answer, sends the answer to the client.

Parameters

query	A pointer to the unparked packet.
ctx	Pointer to The client context.
allow_answer_park	Indicates if parking a packet is allowed.

Definition at line 1596 of file dhcp4_srv.cc.

References isc::dhcp::DHCP4_PACKET_PROCESS_EXCEPTION, isc::dhcp::DHCP4_PACKET_PROCESS_STD_EXCEPTION, isc::dhcp::getCalloutHandle(), LOG_ERROR, isc::dhcp::packet4_logger, processLocalizedQuery4(), and processPacketBufferSend().

Referenced by processLocalizedQuery4AndSendResponse(), selectSubnet(), and selectSubnet4o6().

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◆ processLocalizedQuery4AndSendResponse() [2/2]

void isc::dhcp::Dhcpv4Srv::processLocalizedQuery4AndSendResponse	(	Pkt4Ptr	query,
		bool	allow_answer_park )

Process a localized incoming DHCPv4 query.

A variant of the precedent method used to resume processing for packets parked in the subnet4_select callout.

Parameters

query	A pointer to the unparked packet.
allow_answer_park	Indicates if parking a packet is allowed.

Definition at line 1618 of file dhcp4_srv.cc.

References isc::dhcp::getCalloutHandle(), initContext0(), and processLocalizedQuery4AndSendResponse().

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◆ processPacket()

Pkt4Ptr isc::dhcp::Dhcpv4Srv::processPacket	(	Pkt4Ptr	query,
		bool	allow_answer_park = true )

Process a single incoming DHCPv4 packet.

It verifies correctness of the passed packet, calls per-type processXXX methods, generates appropriate answer.

Parameters

query	A pointer to the packet to be processed.
allow_answer_park	Indicates if parking a packet is allowed.

Returns: A pointer to the response.

Definition at line 1327 of file dhcp4_srv.cc.

References accept(), isc::dhcp::bad_packet4_logger, isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), classifyPacket(), isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::DBG_DHCP4_DETAIL_DATA, isc::dhcp::DBG_DHCP4_HOOKS, isc::log::DBGLVL_PKT_HANDLING, deferredUnpack(), isc::dhcp::DHCP4_BUFFER_UNPACK, isc::dhcp::DHCP4_HOOK_BUFFER_RCVD_DROP, isc::dhcp::DHCP4_HOOK_BUFFER_RCVD_SKIP, isc::dhcp::DHCP4_HOOK_PACKET_RCVD_SKIP, isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_PACKET_DROP_0001, isc::dhcp::DHCP4_PACKET_DROP_0010, isc::dhcp::DHCP4_PACKET_OPTIONS_SKIPPED, isc::dhcp::DHCP4_PACKET_RECEIVED, isc::dhcp::DHCP4_QUERY_DATA, isc::dhcp::DHCP4_QUERY_LABEL, isc::dhcp::getCalloutHandle(), Hooks, isc::hooks::hooks_logger, isc::stats::StatsMgr::instance(), LOG_DEBUG, LOG_INFO, isc::hooks::CalloutHandle::NEXT_STEP_DROP, isc::hooks::CalloutHandle::NEXT_STEP_SKIP, isc::dhcp::options4_logger, isc::dhcp::packet4_logger, processDhcp4Query(), processStatsReceived(), and recoverStashedAgentOption().

Referenced by processPacketAndSendResponse().

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◆ processPacketAndSendResponse()

void isc::dhcp::Dhcpv4Srv::processPacketAndSendResponse ( Pkt4Ptr query )

Process a single incoming DHCPv4 packet and sends the response.

It verifies correctness of the passed packet, calls per-type processXXX methods, generates appropriate answer, sends the answer to the client.

Parameters

query A pointer to the packet to be processed.

Definition at line 1315 of file dhcp4_srv.cc.

References isc::dhcp::getCalloutHandle(), processPacket(), and processPacketBufferSend().

Referenced by processPacketAndSendResponseNoThrow(), and runOne().

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◆ processPacketAndSendResponseNoThrow()

void isc::dhcp::Dhcpv4Srv::processPacketAndSendResponseNoThrow ( Pkt4Ptr query )

Process a single incoming DHCPv4 packet and sends the response.

It verifies correctness of the passed packet, calls per-type processXXX methods, generates appropriate answer, sends the answer to the client.

Parameters

query A pointer to the packet to be processed.

Definition at line 1302 of file dhcp4_srv.cc.

References isc::dhcp::DHCP4_PACKET_PROCESS_EXCEPTION, isc::dhcp::DHCP4_PACKET_PROCESS_STD_EXCEPTION, LOG_ERROR, isc::dhcp::packet4_logger, and processPacketAndSendResponse().

Referenced by runOne().

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◆ processPacketBufferSend()

void isc::dhcp::Dhcpv4Srv::processPacketBufferSend	(	hooks::CalloutHandlePtr &	callout_handle,
		Pkt4Ptr &	rsp )

protected

Executes buffer4_send callout and sends the response.

Parameters

callout_handle	pointer to the callout handle.
rsp	pointer to a response.

Definition at line 1960 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp::DBG_DHCP4_DETAIL_DATA, isc::dhcp::DBG_DHCP4_HOOKS, isc::dhcp::DHCP4_HOOK_BUFFER_SEND_SKIP, isc::dhcp::DHCP4_PACKET_SEND, isc::dhcp::DHCP4_PACKET_SEND_FAIL, isc::dhcp::DHCP4_RESPONSE_DATA, Hooks, isc::hooks::hooks_logger, LOG_DEBUG, LOG_ERROR, LOG_INFO, isc::hooks::CalloutHandle::NEXT_STEP_DROP, isc::hooks::CalloutHandle::NEXT_STEP_SKIP, isc::dhcp::packet4_logger, processStatsSent(), and sendPacket().

Referenced by processDhcp4QueryAndSendResponse(), processLocalizedQuery4(), processLocalizedQuery4AndSendResponse(), processPacketAndSendResponse(), and sendResponseNoThrow().

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◆ processPacketPktSend()

void isc::dhcp::Dhcpv4Srv::processPacketPktSend	(	hooks::CalloutHandlePtr &	callout_handle,
		Pkt4Ptr &	query,
		Pkt4Ptr &	rsp,
		ConstSubnet4Ptr &	subnet )

protected

Executes pkt4_send callout.

Parameters

callout_handle	pointer to the callout handle.
query	Pointer to a query.
rsp	Pointer to a response.
subnet	A pointer to selected subnet.

Callouts decided to drop the packet.

Definition at line 1889 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::DBG_DHCP4_HOOKS, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_HOOK_PACKET_SEND_DROP, isc::dhcp::DHCP4_HOOK_PACKET_SEND_SKIP, isc::dhcp::DHCP4_PACKET_PACK, isc::dhcp::DHCP4_PACKET_PACK_FAIL, Hooks, isc::hooks::hooks_logger, LOG_DEBUG, LOG_ERROR, isc::hooks::CalloutHandle::NEXT_STEP_DROP, isc::hooks::CalloutHandle::NEXT_STEP_SKIP, and isc::dhcp::options4_logger.

Referenced by processLocalizedQuery4(), and sendResponseNoThrow().

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◆ processRelease()

void isc::dhcp::Dhcpv4Srv::processRelease	(	Pkt4Ptr &	release,
		AllocEngine::ClientContext4Ptr &	context )

protected

Processes incoming DHCPRELEASE messages.

In DHCPv4, server does not respond to RELEASE messages, therefore this function does not return anything.

Parameters

release	message received from client
context	pointer to the client context where released lease is stored.

Definition at line 3975 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp_ddns::CHG_REMOVE, isc::dhcp::DBG_DHCP4_DETAIL, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_HOOK_LEASE4_RELEASE_SKIP, isc::dhcp::DHCP4_RELEASE, isc::dhcp::DHCP4_RELEASE_DELETED, isc::dhcp::DHCP4_RELEASE_EXCEPTION, isc::dhcp::DHCP4_RELEASE_EXPIRED, isc::dhcp::DHCP4_RELEASE_FAIL, isc::dhcp::DHCP4_RELEASE_FAIL_NO_LEASE, isc::dhcp::DHCP4_RELEASE_FAIL_WRONG_CLIENT, isc::stats::StatsMgr::generateName(), isc::dhcp::getCalloutHandle(), Hooks, isc::hooks::hooks_logger, isc::dhcp::Lease::INFINITY_LFT, isc::dhcp::CfgMgr::instance(), isc::dhcp::LeaseMgrFactory::instance(), isc::stats::StatsMgr::instance(), isc::dhcp::lease4_logger, LOG_DEBUG, LOG_ERROR, LOG_INFO, isc::hooks::CalloutHandle::NEXT_STEP_DROP, isc::hooks::CalloutHandle::NEXT_STEP_SKIP, isc::dhcp::queueNCR(), isc::dhcp::Lease::STATE_RELEASED, and isc::dhcp::Lease::TYPE_V4.

Referenced by processLocalizedQuery4().

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◆ processRequest()

Pkt4Ptr isc::dhcp::Dhcpv4Srv::processRequest	(	Pkt4Ptr &	request,
		AllocEngine::ClientContext4Ptr &	context )

protected

Processes incoming REQUEST and returns REPLY response.

Processes incoming REQUEST message and verifies that its sender should be served. In particular, verifies that requested lease is valid, not expired, not reserved, not used by other client and that requesting client is allowed to use it.

Returns ACK message, NAK message, or null

Parameters

request	a message received from client
context	pointer to the client context where allocated and deleted leases are stored.

Returns: ACK or NAK message

Definition at line 3894 of file dhcp4_srv.cc.

References adjustIfaceData(), alloc_engine_, appendBasicOptions(), appendRequestedOptions(), appendRequestedVendorOptions(), appendServerID(), assignLease(), buildCfgOptionList(), isc::dhcp::DBG_DHCP4_BASIC, isc::dhcp::DHCP4_CLASSES_ASSIGNED, isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_V6_ONLY_PREFERRED_MISSING_IN_ACK, isc::dhcp::DHO_V6_ONLY_PREFERRED, evaluateAdditionalClasses(), isc::util::MultiThreadingMgr::instance(), LOG_DEBUG, LOG_ERROR, isc::dhcp::packet4_logger, and setFixedFields().

Referenced by processLocalizedQuery4().

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◆ processStatsReceived()

void isc::dhcp::Dhcpv4Srv::processStatsReceived ( const Pkt4Ptr & query )

static

Class methods for DHCPv4-over-DHCPv6 handler.

Updates statistics for received packets

Parameters

query packet received

Definition at line 5120 of file dhcp4_srv.cc.

References isc::dhcp::DHCPACK, isc::dhcp::DHCPDECLINE, isc::dhcp::DHCPDISCOVER, isc::dhcp::DHCPINFORM, isc::dhcp::DHCPNAK, isc::dhcp::DHCPOFFER, isc::dhcp::DHCPRELEASE, isc::dhcp::DHCPREQUEST, and isc::stats::StatsMgr::instance().

Referenced by processPacket().

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◆ processStatsSent()

void isc::dhcp::Dhcpv4Srv::processStatsSent ( const Pkt4Ptr & response )

static

Updates statistics for transmitted packets.

Parameters

response packet transmitted

Definition at line 5169 of file dhcp4_srv.cc.

References isc::dhcp::DHCPACK, isc::dhcp::DHCPNAK, isc::dhcp::DHCPOFFER, and isc::stats::StatsMgr::instance().

Referenced by isc::dhcp::Dhcp4to6Ipc::handler(), and processPacketBufferSend().

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◆ receivePacket()

Pkt4Ptr isc::dhcp::Dhcpv4Srv::receivePacket ( int timeout )

protectedvirtual

dummy wrapper around IfaceMgr::receive4

This method is useful for testing purposes, where its replacement simulates reception of a packet. For that purpose it is protected.

Definition at line 1079 of file dhcp4_srv.cc.

References isc::dhcp::IfaceMgr::instance().

Referenced by runOne().

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◆ recoverStashedAgentOption()

void isc::dhcp::Dhcpv4Srv::recoverStashedAgentOption ( const Pkt4Ptr & query )

protected

Recover stashed agent options from client address lease.

This method checks:

client address is not 0.0.0.0.
relay address is 0.0.0.0.
stash-agent-options is true (vs false, the default).
the query is a DHCPREQUEST.
there is no RAI or an empty RAI in the query.
the query is not member of the STASH_AGENT_OPTIONS client class.
there is a lease for the client address.
the lease is not expired.
the lease has a RAI in its extended info in its user context.
the lease belongs to the client.
a not empty RAI can be recovered from the lease. when all checks pass:
add the recovered RAI to the query.
put the query in the STASH_AGENT_OPTIONS client class.

Definition at line 4484 of file dhcp4_srv.cc.

References isc::data::Element::boolean, isc::dhcp::DBG_DHCP4_DETAIL_DATA, isc::util::str::decodeFormattedHexString(), isc::dhcp::DHCP4_RECOVERED_STASHED_RELAY_AGENT_INFO, isc::dhcp::DHCPREQUEST, isc::dhcp::DHO_DHCP_AGENT_OPTIONS, isc::dhcp::LibDHCP::DHO_DHCP_AGENT_OPTIONS_DEF(), isc::dhcp::CfgMgr::instance(), isc::dhcp::LeaseMgrFactory::instance(), LOG_DEBUG, isc::data::Element::map, isc::dhcp::Option::OPTION4_HDR_LEN, isc::dhcp::packet4_logger, isc::dhcp::CfgGlobals::STASH_AGENT_OPTIONS, isc::data::Element::string, and isc::dhcp::Option::V4.

Referenced by processPacket().

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◆ renewLease()

void isc::dhcp::Dhcpv4Srv::renewLease	(	const Pkt4Ptr &	renew,
		Pkt4Ptr &	reply )

protected

Attempts to renew received addresses.

Attempts to renew existing lease. This typically includes finding a lease that corresponds to the received address. If no such lease is found, a status code response is generated.

Parameters

renew	client's message asking for renew
reply	server's response (ACK or NAK)

◆ run()

int isc::dhcp::Dhcpv4Srv::run ( )

Main server processing loop.

Main server processing loop. Call the processing step routine until shut down.

Returns: The value returned by Daemon::getExitValue().

Definition at line 1170 of file dhcp4_srv.cc.

References isc::dhcp::DHCP4_PACKET_PROCESS_EXCEPTION_MAIN, isc::dhcp::DHCP4_PACKET_PROCESS_STD_EXCEPTION_MAIN, isc::process::Daemon::getExitValue(), getIOService(), isc::asiolink::IOServiceMgr::instance(), isc::config::HttpCommandMgr::instance(), isc::util::MultiThreadingMgr::instance(), isc_throw, LOG_ERROR, isc::dhcp::packet4_logger, runOne(), server_port_, and shutdown_.

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◆ runOne()

void isc::dhcp::Dhcpv4Srv::runOne ( )

Main server processing step.

Main server processing step. Receives one incoming packet, calls the processing packet routing and (if necessary) transmits a response.

Definition at line 1228 of file dhcp4_srv.cc.

References isc::dhcp::bad_packet4_logger, isc::dhcp::DBG_DHCP4_BASIC, isc::dhcp::DBG_DHCP4_DETAIL, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_BUFFER_RECEIVE_FAIL, isc::dhcp::DHCP4_BUFFER_RECEIVED, isc::dhcp::DHCP4_BUFFER_WAIT_SIGNAL, isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_PACKET_DROP_0008, isc::dhcp::DHCP4_PACKET_QUEUE_FULL, isc::util::MultiThreadingMgr::instance(), LOG_DEBUG, LOG_ERROR, network_state_, isc::dhcp::packet4_logger, processPacketAndSendResponse(), processPacketAndSendResponseNoThrow(), and receivePacket().

Referenced by run().

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◆ sanityCheck() [1/2]

void isc::dhcp::Dhcpv4Srv::sanityCheck ( const Pkt4Ptr & query )

staticprotected

Verifies if specified packet meets RFC requirements.

Checks if mandatory option is really there, that forbidden option is not there, and that client-id or server-id appears only once. Calls the second method with the requirement level based on message type.

Parameters

query Pointer to the client's message.

Exceptions

RFCViolation if any issues are detected

Definition at line 4821 of file dhcp4_srv.cc.

References isc::dhcp::DHCPDECLINE, isc::dhcp::DHCPDISCOVER, isc::dhcp::DHCPINFORM, isc::dhcp::DHCPRELEASE, isc::dhcp::DHCPREQUEST, FORBIDDEN, OPTIONAL, and sanityCheck().

Referenced by processDhcp4Query(), and sanityCheck().

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◆ sanityCheck() [2/2]

void isc::dhcp::Dhcpv4Srv::sanityCheck	(	const Pkt4Ptr &	query,
		RequirementLevel	serverid )

staticprotected

Verifies if specified packet meets RFC requirements.

Checks if mandatory option is really there, that forbidden option is not there, and that client-id or server-id appears only once.

Parameters

query	Pointer to the client's message.
serverid	expectation regarding server-id option

Exceptions

RFCViolation if any issues are detected

Definition at line 4851 of file dhcp4_srv.cc.

References isc::dhcp::DHO_DHCP_SERVER_IDENTIFIER, FORBIDDEN, isc_throw, MANDATORY, and OPTIONAL.

◆ selectSubnet()

isc::dhcp::ConstSubnet4Ptr isc::dhcp::Dhcpv4Srv::selectSubnet	(	const Pkt4Ptr &	query,
		bool &	drop,
		bool	sanity_only = false,
		bool	allow_answer_park = true )

protected

Selects a subnet for a given client's packet.

If selectSubnet is called to simply do sanity checks (check if a subnet would be selected), then there is no need to call hooks, as this will happen later (when selectSubnet is called again). In such case the sanity_only should be set to true.

Parameters

query	client's message
drop	if it is true the packet will be dropped
sanity_only	if it is true the callout won't be called
allow_answer_park	Indicates if parking a packet is allowed

Returns: selected subnet (or null if no suitable subnet was found)

Definition at line 775 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp::DBG_DHCP4_BASIC_DATA, isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::DBG_DHCP4_DETAIL_DATA, isc::dhcp::DBG_DHCP4_HOOKS, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_HOOK_SUBNET4_SELECT_DROP, isc::dhcp::DHCP4_HOOK_SUBNET4_SELECT_PARK, isc::dhcp::DHCP4_HOOK_SUBNET4_SELECT_PARKING_LOT_FULL, isc::dhcp::DHCP4_HOOK_SUBNET4_SELECT_SKIP, isc::dhcp::DHCP4_SUBNET_DATA, isc::dhcp::DHCP4_SUBNET_SELECTED, isc::dhcp::DHCP4_SUBNET_SELECTION_FAILED, isc::hooks::HooksManager::drop(), isc::dhcp::getCalloutHandle(), Hooks, isc::hooks::hooks_logger, isc::dhcp::CfgSubnets4::initSelector(), isc::dhcp::CfgMgr::instance(), isc::util::MultiThreadingMgr::instance(), LOG_DEBUG, isc::hooks::CalloutHandle::NEXT_STEP_DROP, isc::hooks::CalloutHandle::NEXT_STEP_PARK, isc::hooks::CalloutHandle::NEXT_STEP_SKIP, isc::dhcp::packet4_logger, isc::hooks::HooksManager::park(), processLocalizedQuery4AndSendResponse(), and selectSubnet4o6().

Referenced by acceptDirectRequest(), and processDhcp4Query().

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◆ selectSubnet4o6()

isc::dhcp::ConstSubnet4Ptr isc::dhcp::Dhcpv4Srv::selectSubnet4o6	(	const Pkt4Ptr &	query,
		bool &	drop,
		bool	sanity_only = false,
		bool	allow_answer_park = true )

protected

Selects a subnet for a given client's DHCP4o6 packet.

If selectSubnet is called to simply do sanity checks (check if a subnet would be selected), then there is no need to call hooks, as this will happen later (when selectSubnet is called again). In such case the sanity_only should be set to true.

Parameters

query	client's message
drop	if it is true the packet will be dropped
sanity_only	if it is true the callout won't be called
allow_answer_park	Indicates if parking a packet is allowed

Returns: selected subnet (or null if no suitable subnet was found)

Definition at line 909 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp::SubnetSelector::ciaddr_, D6O_INTERFACE_ID, isc::dhcp::DBG_DHCP4_BASIC_DATA, isc::dhcp::DBG_DHCP4_DETAIL, isc::dhcp::DBG_DHCP4_DETAIL_DATA, isc::dhcp::DBG_DHCP4_HOOKS, isc::log::DBGLVL_PKT_HANDLING, isc::dhcp::DHCP4_DHCP4O6_HOOK_SUBNET4_SELECT_DROP, isc::dhcp::DHCP4_DHCP4O6_HOOK_SUBNET4_SELECT_SKIP, isc::dhcp::DHCP4_DHCP4O6_SUBNET_DATA, isc::dhcp::DHCP4_DHCP4O6_SUBNET_SELECTED, isc::dhcp::DHCP4_DHCP4O6_SUBNET_SELECTION_FAILED, isc::dhcp::DHCP4_HOOK_SUBNET4_SELECT_4O6_PARKING_LOT_FULL, isc::dhcp::DHCP4_HOOK_SUBNET4_SELECT_PARK, isc::dhcp::DHO_SUBNET_SELECTION, isc::hooks::HooksManager::drop(), isc::dhcp::getCalloutHandle(), Hooks, isc::hooks::hooks_logger, isc::dhcp::CfgMgr::instance(), isc::util::MultiThreadingMgr::instance(), isc_throw, LOG_DEBUG, isc::hooks::CalloutHandle::NEXT_STEP_DROP, isc::hooks::CalloutHandle::NEXT_STEP_PARK, isc::hooks::CalloutHandle::NEXT_STEP_SKIP, isc::dhcp::packet4_logger, isc::hooks::HooksManager::park(), processLocalizedQuery4AndSendResponse(), and isc::dhcp::Pkt6::RELAY_GET_FIRST.

Referenced by selectSubnet().

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◆ sendPacket()

void isc::dhcp::Dhcpv4Srv::sendPacket ( const Pkt4Ptr & pkt )

protectedvirtual

dummy wrapper around IfaceMgr::send()

This method is useful for testing purposes, where its replacement simulates transmission of a packet. For that purpose it is protected.

Definition at line 1084 of file dhcp4_srv.cc.

References isc::dhcp::IfaceMgr::instance().

Referenced by processPacketBufferSend().

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◆ sendResponseNoThrow()

void isc::dhcp::Dhcpv4Srv::sendResponseNoThrow	(	hooks::CalloutHandlePtr &	callout_handle,
		Pkt4Ptr &	query,
		Pkt4Ptr &	rsp,
		ConstSubnet4Ptr &	subnet )

Process an unparked DHCPv4 packet and sends the response.

Parameters

callout_handle	pointer to the callout handle.
query	A pointer to the packet to be processed.
rsp	A pointer to the response.
subnet	A pointer to selected subnet.

Definition at line 1873 of file dhcp4_srv.cc.

References isc::dhcp::DHCP4_PACKET_PROCESS_EXCEPTION, isc::dhcp::DHCP4_PACKET_PROCESS_STD_EXCEPTION, LOG_ERROR, isc::dhcp::packet4_logger, processPacketBufferSend(), and processPacketPktSend().

Referenced by processLocalizedQuery4().

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◆ serverDecline()

void isc::dhcp::Dhcpv4Srv::serverDecline	(	hooks::CalloutHandlePtr &	callout_handle,
		Pkt4Ptr &	query,
		Lease4Ptr	lease,
		bool	lease_exists )

protected

Renders a lease declined after the server has detected, via ping-check or other means, that its address is already in-use.

This function is invoked during the unpark callback for the lease4_offer hook point, if a hook callout has set the handle status to NEXT_STEP_DROP. It will create/update the lease to DECLINED state in the lease store, update the appropriate stats, and

Todo: implement a new hook point, lease4_server_declined_lease (name subject to change).

Parameters

callout_handle	- current callout handle.
query	- DHCPDISCOVER which instigated the declination.
lease	- lease to decline (i.e lease that would have been offered).
lease_exists	- true if the lease already exists in the lease store (as is the case when offer-lifetime is > 0).

Definition at line 4303 of file dhcp4_srv.cc.

References isc::hooks::HooksManager::callCallouts(), isc::hooks::HooksManager::calloutsPresent(), isc::dhcp::DHCP4_SERVER_INITIATED_DECLINE, isc::dhcp::DHCP4_SERVER_INITIATED_DECLINE_ADD_FAILED, isc::dhcp::DHCP4_SERVER_INITIATED_DECLINE_RESOURCE_BUSY, isc::dhcp::DHCP4_SERVER_INITIATED_DECLINE_UPDATE_FAILED, isc::stats::StatsMgr::generateName(), Hooks, isc::dhcp::CfgMgr::instance(), isc::dhcp::LeaseMgrFactory::instance(), isc::stats::StatsMgr::instance(), isc::util::MultiThreadingMgr::instance(), isc::dhcp::lease4_logger, LOG_ERROR, LOG_INFO, and isc::dhcp::Lease::TYPE_V4.

Referenced by processLocalizedQuery4(), and serverDeclineNoThrow().

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◆ serverDeclineNoThrow()

void isc::dhcp::Dhcpv4Srv::serverDeclineNoThrow	(	hooks::CalloutHandlePtr &	callout_handle,
		Pkt4Ptr &	query,
		Lease4Ptr	lease,
		bool	lease_exists )

protected

Exception safe wrapper around serverDecline()

In MT mode this wrapper is used to safely invoke serverDecline() as a DHCP worker thread task.

Parameters

callout_handle	- current callout handle.
query	- DHCPDISCOVER which instigated the declination.
lease	- lease to decline (i.e lease that would have been offered).
lease_exists	- true if the lease already exists in the lease store (as is the case when offer-lifetime is > 0).

Definition at line 4419 of file dhcp4_srv.cc.

References isc::dhcp::DHCP4_PACKET_PROCESS_EXCEPTION, LOG_ERROR, isc::dhcp::packet4_logger, and serverDecline().

Referenced by processLocalizedQuery4().

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◆ setFixedFields()

void isc::dhcp::Dhcpv4Srv::setFixedFields ( Dhcpv4Exchange & ex )

protected

Sets fixed fields of the outgoing packet.

If the incoming packets belongs to a class and that class defines next-server, server-hostname or boot-file-name, we need to set the siaddr, sname or filename fields in the outgoing packet. Also, those values can be defined for subnet or in reservations. The values defined in reservation takes precedence over class values, which in turn take precedence over subnet values.

Parameters

ex	DHCPv4 exchange holding the client's message and the server's response to be adjusted.

Definition at line 3673 of file dhcp4_srv.cc.

References isc::dhcp::CfgMgr::instance(), and isc::asiolink::IOAddress::IPV4_ZERO_ADDRESS().

Referenced by processDiscover(), processInform(), and processRequest().

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◆ setPacketStatisticsDefaults()

void isc::dhcp::Dhcpv4Srv::setPacketStatisticsDefaults ( )

protected

This function sets statistics related to DHCPv4 packets processing to their initial values.

All of the statistics observed by the DHCPv4 server and with the names like "pkt4-" are reset to 0. This function must be invoked in the class constructor.

Definition at line 714 of file dhcp4_srv.cc.

References isc::stats::StatsMgr::instance().

Referenced by Dhcpv4Srv().

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◆ setSendResponsesToSource()

void isc::dhcp::Dhcpv4Srv::setSendResponsesToSource ( bool value )

inlineprotected

Sets value of the test_send_responses_to_source_ flag.

Parameters

value new value of the test_send_responses_to_source_ flag.

Definition at line 891 of file dhcp4_srv.h.

◆ setTeeTimes()

void isc::dhcp::Dhcpv4Srv::setTeeTimes	(	const Lease4Ptr &	lease,
		const ConstSubnet4Ptr &	subnet,
		Pkt4Ptr	resp )

protected

Adds the T1 and T2 timers to the outbound response as appropriate.

This method determines if either of the timers T1 (option 58) and T2 (option 59) should be sent to the client. It is influenced by the lease's subnet's values for renew-timer, rebind-timer, calculate-tee-times, t1-percent, and t2-percent as follows:

By default neither T1 nor T2 will be sent.

T2:

If rebind-timer is set use its value, otherwise if calculate-tee-times is true use the value given by valid lease time * t2-percent. Either way the value will only be sent if it is less than the valid lease time.

T1:

If renew-timer is set use its value, otherwise if calculate-tee-times is true use the value given by valid lease time * t1-percent. Either way the value will only be sent if it is less than T2 when T2 is being sent, or less than the valid lease time if T2 is not being sent.

Parameters

lease	lease being assigned to the client
subnet	the subnet to which the lease belongs
resp	outbound response for the client to which timers are added.

Todo: This logic to be modified if we decide to support infinite lease times.

Definition at line 3432 of file dhcp4_srv.cc.

References isc::dhcp::DHO_DHCP_REBINDING_TIME, isc::dhcp::DHO_DHCP_RENEWAL_TIME, and isc::dhcp::Option::V4.

Referenced by assignLease().

◆ shutdown()

void isc::dhcp::Dhcpv4Srv::shutdown ( )

overridevirtual

Instructs the server to shut down.

Reimplemented from isc::process::Daemon.

Definition at line 769 of file dhcp4_srv.cc.

References isc::dhcp::DBG_DHCP4_BASIC, isc::dhcp::dhcp4_logger, isc::dhcp::DHCP4_SHUTDOWN_REQUEST, LOG_DEBUG, and shutdown_.

Referenced by isc::dhcp::ControlledDhcpv4Srv::shutdownServer().

◆ srvidToString()

string isc::dhcp::Dhcpv4Srv::srvidToString ( const OptionPtr & opt )

staticprotected

converts server-id to text Converts content of server-id option to a text representation, e.g.

"192.0.2.1"

Parameters

opt	option that contains server-id

Returns: string representation

Definition at line 2033 of file dhcp4_srv.cc.

References isc_throw.

◆ startD2()

void isc::dhcp::Dhcpv4Srv::startD2 ( )

Starts DHCP_DDNS client IO if DDNS updates are enabled.

If updates are enabled, it instructs the D2ClientMgr singleton to enter send mode. If D2ClientMgr encounters errors it may throw D2ClientError. This method does not catch exceptions.

Definition at line 5056 of file dhcp4_srv.cc.

References d2ClientErrorHandler(), and isc::dhcp::CfgMgr::instance().

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◆ stopD2()

void isc::dhcp::Dhcpv4Srv::stopD2 ( )

Stops DHCP_DDNS client IO if DDNS updates are enabled.

If updates are enabled, it instructs the D2ClientMgr singleton to leave send mode. If D2ClientMgr encounters errors it may throw D2ClientError. This method does not catch exceptions.

Definition at line 5068 of file dhcp4_srv.cc.

References isc::dhcp::CfgMgr::instance().

Referenced by ~Dhcpv4Srv().

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◆ useBroadcast()

bool isc::dhcp::Dhcpv4Srv::useBroadcast ( ) const

inline

Return bool value indicating that broadcast flags should be set on sockets.

Returns: A bool value indicating that broadcast should be used (if true).

Definition at line 464 of file dhcp4_srv.h.

References use_bcast_.

Referenced by isc::dhcp::ControlledDhcpv4Srv::processConfig().

Member Data Documentation

◆ alloc_engine_

boost::shared_ptr<AllocEngine> isc::dhcp::Dhcpv4Srv::alloc_engine_

protected

Allocation Engine.

Pointer to the allocation engine that we are currently using It must be a pointer, because we will support changing engines during normal operation (e.g. to use different allocators)

Definition at line 1279 of file dhcp4_srv.h.

Referenced by Dhcpv4Srv(), assignLease(), earlyGHRLookup(), processDiscover(), processInform(), and processRequest().

◆ cb_control_

CBControlDHCPv4Ptr isc::dhcp::Dhcpv4Srv::cb_control_

protected

Controls access to the configuration backends.

Definition at line 1289 of file dhcp4_srv.h.

Referenced by getCBControl().

◆ client_port_

uint16_t isc::dhcp::Dhcpv4Srv::client_port_

protected

UDP port number to which server sends all responses.

Definition at line 1269 of file dhcp4_srv.h.

Referenced by adjustIfaceData().

◆ network_state_

NetworkStatePtr isc::dhcp::Dhcpv4Srv::network_state_

protected

Holds information about disabled DHCP service and/or disabled subnet/network scopes.

Definition at line 1286 of file dhcp4_srv.h.

Referenced by getNetworkState(), and runOne().

◆ server_port_

uint16_t isc::dhcp::Dhcpv4Srv::server_port_

protected

UDP port number on which server listens.

Definition at line 1266 of file dhcp4_srv.h.

Referenced by adjustIfaceData(), getServerPort(), inTestMode(), and run().

◆ shutdown_

volatile bool isc::dhcp::Dhcpv4Srv::shutdown_

protected

Indicates if shutdown is in progress.

Setting it to true will initiate server shutdown procedure.

Definition at line 1273 of file dhcp4_srv.h.

Referenced by Dhcpv4Srv(), run(), and shutdown().

◆ use_bcast_

bool isc::dhcp::Dhcpv4Srv::use_bcast_

protected

Should broadcast be enabled on sockets (if true).

Definition at line 1282 of file dhcp4_srv.h.

Referenced by useBroadcast().

◆ VENDOR_CLASS_PREFIX

const std::string isc::dhcp::Dhcpv4Srv::VENDOR_CLASS_PREFIX

static

this is a prefix added to the content of vendor-class option

If incoming packet has a vendor class option, its content is prepended with this prefix and then interpreted as a class. For example, a packet that sends vendor class with value of "FOO" will cause the packet to be assigned to class VENDOR_CLASS_FOO.

Definition at line 933 of file dhcp4_srv.h.

Referenced by isc::dhcp::Dhcpv4Exchange::classifyByVendor().

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

Public Types

Public Member Functions

Static Public Member Functions

Functions filtering and sanity-checking received messages.

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ RequirementLevel

Constructor & Destructor Documentation

◆ Dhcpv4Srv()

◆ ~Dhcpv4Srv()

Member Function Documentation

◆ accept()

◆ acceptDirectRequest()

◆ acceptMessageType()

◆ acceptServerId()

◆ adjustIfaceData()

◆ adjustRemoteAddr()

◆ appendBasicOptions()

◆ appendRequestedOptions()

◆ appendRequestedVendorOptions()

◆ appendServerID()

◆ assignLease()

◆ assignZero()

◆ buildCfgOptionList()

◆ checkRelayPort()

◆ classifyPacket()

◆ createNameChangeRequests()

◆ d2ClientErrorHandler()

◆ declineLease()

◆ deferredUnpack()

◆ discardPackets()

◆ earlyGHRLookup()

◆ evaluateAdditionalClasses()

◆ getCBControl()

◆ getHookIndexBuffer4Receive()

◆ getHookIndexBuffer4Send()

◆ getHookIndexLease4Decline()

◆ getHookIndexLease4Release()

◆ getHookIndexPkt4Receive()

◆ getHookIndexPkt4Send()

◆ getHookIndexSubnet4Select()

◆ getIOService()

◆ getNetworkState()

◆ getSendResponsesToSource()

◆ getServerPort()

◆ getVersion()

◆ initContext0()

◆ inTestMode()

◆ jsonPathsToRedact()

◆ postAllocateNameUpdate()

◆ processClientName()

◆ processDecline()

◆ processDhcp4Query()

◆ processDhcp4QueryAndSendResponse()

◆ processDiscover()

◆ processInform()

◆ processLocalizedQuery4()

◆ processLocalizedQuery4AndSendResponse() [1/2]

◆ processLocalizedQuery4AndSendResponse() [2/2]

◆ processPacket()

◆ processPacketAndSendResponse()

◆ processPacketAndSendResponseNoThrow()

◆ processPacketBufferSend()

◆ processPacketPktSend()

◆ processRelease()

◆ processRequest()

◆ processStatsReceived()

◆ processStatsSent()

◆ receivePacket()

◆ recoverStashedAgentOption()

◆ renewLease()

◆ run()

◆ runOne()

◆ sanityCheck() [1/2]

◆ sanityCheck() [2/2]

◆ selectSubnet()

◆ selectSubnet4o6()

◆ sendPacket()

◆ sendResponseNoThrow()