Controlled version of the DHCPv4 server. More...

#include <ctrl_dhcp4_srv.h>

Inheritance diagram for isc::dhcp::ControlledDhcpv4Srv:

Public Member Functions
	ControlledDhcpv4Srv (uint16_t port=DHCP4_SERVER_PORT)
	Constructor. More...

	~ControlledDhcpv4Srv ()
	Destructor. More...

isc::data::ConstElementPtr	checkConfig (isc::data::ConstElementPtr new_config)
	Configuration checker. More...

void	cleanup ()
	Performs cleanup, immediately before termination. More...

void	init (const std::string &config_file)
	Initializes the server. More...

isc::data::ConstElementPtr	loadConfigFile (const std::string &file_name)
	Loads specific config file. More...

void	shutdown ()
	Initiates shutdown procedure for the whole DHCPv4 server. More...

Public Member Functions inherited from isc::dhcp::Dhcpv4Srv
	Dhcpv4Srv (uint16_t port=DHCP4_SERVER_PORT, const bool use_bcast=true, const bool direct_response_desired=true)
	Default constructor. More...

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

void	classifyByVendor (const Pkt4Ptr &pkt)
	Assign class using vendor-class-identifier option. More...

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

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

void	discardPackets ()
	Discard all in-progress packets. More...

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

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

void	processPacket (Pkt4Ptr &query, Pkt4Ptr &rsp, bool allow_packet_park=true)
	Process a single incoming DHCPv4 packet. More...

bool	run ()
	Main server processing loop. More...

void	run_one ()
	Main server processing step. More...

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

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

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

uint16_t	getPort () const
	Get UDP port on which server should listen. More...

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

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

virtual	~Daemon ()
	Destructor. More...

void	checkConfigFile () const
	Checks the configuration file name. More...

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

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

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

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

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

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

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

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

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

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

Static Public Member Functions
static ControlledDhcpv4Srv *	getInstance ()
	Returns pointer to the sole instance of Dhcpv4Srv. More...

static isc::data::ConstElementPtr	processCommand (const std::string &command, isc::data::ConstElementPtr args)
	Command processor. More...

static isc::data::ConstElementPtr	processConfig (isc::data::ConstElementPtr new_config)
	Configuration processor. More...

Static Public Member Functions inherited from isc::dhcp::Dhcpv4Srv
static void	evaluateClasses (const Pkt4Ptr &pkt, bool depend_on_known)
	Evaluate classes. More...

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

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

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

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

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

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

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

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

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

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

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. More...

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

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

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

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

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

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

Additional Inherited Members
Public Types inherited from isc::dhcp::Dhcpv4Srv
enum	RequirementLevel { FORBIDDEN, MANDATORY, OPTIONAL }
	defines if certain option may, must or must not appear More...

Protected Member Functions inherited from isc::dhcp::Dhcpv4Srv
void	appendBasicOptions (Dhcpv4Exchange &ex)
	Append basic options if they are not present. More...

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

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

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

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

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

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

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

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

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

Pkt4Ptr	processDiscover (Pkt4Ptr &discover)
	Processes incoming DISCOVER and returns response. More...

Pkt4Ptr	processInform (Pkt4Ptr &inform)
	Processes incoming DHCPINFORM messages. More...

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

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

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

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

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

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

void	requiredClassify (Dhcpv4Exchange &ex)
	Assigns incoming packet to zero or more classes (required pass). More...

isc::dhcp::Subnet4Ptr	selectSubnet (const Pkt4Ptr &query, bool &drop, bool sanity_only=false) const
	Selects a subnet for a given client's packet. More...

isc::dhcp::Subnet4Ptr	selectSubnet4o6 (const Pkt4Ptr &query, bool &drop, bool sanity_only=false) const
	Selects a subnet for a given client's DHCP4o6 packet. More...

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

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

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

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

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

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

Protected Member Functions inherited from isc::process::Daemon
virtual void	handleSignal ()
	Invokes handler for the next received signal. More...

std::string	makePIDFileName () const
	Manufacture the pid file name. More...

Static Protected Member Functions inherited from isc::dhcp::Dhcpv4Srv
static void	adjustIfaceData (Dhcpv4Exchange &ex)
	Set IP/UDP and interface parameters for the DHCPv4 response. More...

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

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

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

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

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

Protected Attributes inherited from isc::dhcp::Dhcpv4Srv
boost::shared_ptr< AllocEngine >	alloc_engine_
	Allocation Engine. More...

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

volatile bool	shutdown_
	indicates if shutdown is in progress. More...

Protected Attributes inherited from isc::process::Daemon
isc::util::SignalHandler	signal_handler_
	Pointer to the common signal handler invoked by the handleSignal function. More...

isc::util::SignalSetPtr	signal_set_
	A pointer to the object installing custom signal handlers. More...

Static Protected Attributes inherited from isc::dhcp::Dhcpv4Srv
static const std::string	VENDOR_CLASS_PREFIX
	this is a prefix added to the content of vendor-class option More...

Detailed Description

Controlled version of the DHCPv4 server.

This is a class that is responsible for DHCPv4 server being controllable, by reading configuration file from disk.

Definition at line 25 of file ctrl_dhcp4_srv.h.

Constructor & Destructor Documentation

◆ ControlledDhcpv4Srv()

isc::dhcp::ControlledDhcpv4Srv::ControlledDhcpv4Srv ( uint16_t port = DHCP4_SERVER_PORT )

Constructor.

Parameters

port	UDP port to be opened for DHCP traffic

Definition at line 718 of file ctrl_dhcp4_srv.cc.

References getInstance(), isc::dhcp::Dhcpv4Srv::getIOService(), isc::dhcp::TimerMgr::instance(), and isc_throw.

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◆ ~ControlledDhcpv4Srv()

isc::dhcp::ControlledDhcpv4Srv::~ControlledDhcpv4Srv ( )

Destructor.

Definition at line 796 of file ctrl_dhcp4_srv.cc.

References cleanup().

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Member Function Documentation

◆ checkConfig()

isc::data::ConstElementPtr isc::dhcp::ControlledDhcpv4Srv::checkConfig ( isc::data::ConstElementPtr new_config )

Configuration checker.

This is a method for checking incoming configuration.

Parameters

new_config JSON representation of the new configuration

Returns: status of the config check

Definition at line 700 of file ctrl_dhcp4_srv.cc.

References isc::dhcp::configureDhcp4Server(), isc::config::createAnswer(), isc::dhcp::DBG_DHCP4_COMMAND, isc::dhcp::dhcp4_logger, and LOG_DEBUG.

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◆ cleanup()

void isc::dhcp::ControlledDhcpv4Srv::cleanup ( )

virtual

Performs cleanup, immediately before termination.

This method performs final clean up, just before the Dhcpv4Srv object is destroyed. Currently it is a no-op.

Reimplemented from isc::process::Daemon.

Definition at line 103 of file ctrl_dhcp4_srv.cc.

Referenced by ~ControlledDhcpv4Srv().

◆ getInstance()

static ControlledDhcpv4Srv* isc::dhcp::ControlledDhcpv4Srv::getInstance ( )

inlinestatic

Returns pointer to the sole instance of Dhcpv4Srv.

Returns: server instance (may return NULL, if called before server is spawned)

Definition at line 118 of file ctrl_dhcp4_srv.h.

Referenced by ControlledDhcpv4Srv(), and isc::dhcp::Dhcp4to6Ipc::handler().

◆ init()

void isc::dhcp::ControlledDhcpv4Srv::init ( const std::string & config_file )

Initializes the server.

It reads the JSON file from disk or may perform any other setup operation. In particular, it also install signal handlers.

This method may throw if initialization fails.

Definition at line 80 of file ctrl_dhcp4_srv.cc.

References isc_throw, and isc::config::parseAnswer().

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◆ loadConfigFile()

ConstElementPtr isc::dhcp::ControlledDhcpv4Srv::loadConfigFile ( const std::string & file_name )

Loads specific config file.

Configure DHCPv4 server using the configuration file specified.

This utility method is called whenever we know a filename of the config and need to load it. It calls config-set command once the content of the file has been loaded and verified to be a sane JSON configuration. config-set handler will process the config file (load it as current configuration).

Parameters

file_name name of the file to be loaded

Returns: status of the file loading and outcome of config-set

This function is used to both configure the DHCP server on its startup and dynamically reconfigure the server when SIGHUP signal is received.

It fetches DHCPv4 server's configuration from the 'Dhcp4' section of the JSON configuration file.

Parameters

file_name Configuration file location.

Returns: status of the command

Definition at line 118 of file ctrl_dhcp4_srv.cc.

References isc::dhcp::dhcp4_logger, isc_throw, LOG_ERROR, isc::asiodns::logger, isc::data::Element::map, isc::config::parseAnswer(), isc::dhcp::Parser4Context::parseFile(), and isc::Exception::what().

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◆ processCommand()

ConstElementPtr isc::dhcp::ControlledDhcpv4Srv::processCommand	(	const std::string &	command,
		isc::data::ConstElementPtr	args
	)

static

Command processor.

This method is uniform for all config backends. It processes received command (as a string + JSON arguments). Internally, it's just a wrapper that calls process*Command() methods and catches exceptions in them.

Currently supported commands are:

config-reload
config-test
shutdown
libreload
leases-reclaim ...

Note: It never throws.

Parameters

command	Text representation of the command (e.g. "shutdown")
args	Optional parameters

Returns: status of the command

Definition at line 511 of file ctrl_dhcp4_srv.cc.

References isc::config::createAnswer(), isc::dhcp::DBG_DHCP4_COMMAND, isc::dhcp::dhcp4_logger, LOG_DEBUG, and isc::Exception::what().

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◆ processConfig()

isc::data::ConstElementPtr isc::dhcp::ControlledDhcpv4Srv::processConfig ( isc::data::ConstElementPtr new_config )

static

Configuration processor.

This is a method for handling incoming configuration updates. This method should be called by all configuration backends when the server is starting up or when configuration has changed.

As pointer to this method is used a callback in ASIO used in ModuleCCSession, it has to be static.

Parameters

new_config textual representation of the new configuration

Returns: status of the config update

Definition at line 576 of file ctrl_dhcp4_srv.cc.

References isc::dhcp::configureDhcp4Server(), isc::config::createAnswer(), isc::dhcp::DBG_DHCP4_COMMAND, isc::dhcp::dhcp4_logger, isc::dhcp::Dhcpv4Srv::getIOService(), isc::dhcp::Dhcpv4Srv::getNetworkState(), isc::dhcp::Dhcpv4Srv::getPort(), Hooks, LOG_DEBUG, LOG_INFO, isc::config::parseAnswer(), and isc::dhcp::Dhcpv4Srv::startD2().

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◆ shutdown()

void isc::dhcp::ControlledDhcpv4Srv::shutdown ( )

virtual

Initiates shutdown procedure for the whole DHCPv4 server.

Reimplemented from isc::process::Daemon.

Definition at line 791 of file ctrl_dhcp4_srv.cc.

References isc::dhcp::Dhcpv4Srv::shutdown(), and isc::asiolink::IOService::stop().

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

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ControlledDhcpv4Srv()

◆ ~ControlledDhcpv4Srv()

Member Function Documentation

◆ checkConfig()

◆ cleanup()

◆ getInstance()

◆ init()

◆ loadConfigFile()

◆ processCommand()

◆ processConfig()

◆ shutdown()