Holds communication state between DHCPv4 servers. More...

#include <communication_state.h>

Inheritance diagram for isc::ha::CommunicationState4:

Classes
struct	ConnectingClient4
	Structure holding information about the client which has sent the packet being analyzed. More...

struct	RejectedClient4
	Structure holding information about the client who has a rejected lease update. More...

Public Member Functions
	CommunicationState4 (const asiolink::IOServicePtr &io_service, const HAConfigPtr &config)
	Constructor.

virtual void	analyzeMessage (const boost::shared_ptr< dhcp::Pkt > &message)
	Checks if the DHCPv4 message appears to be unanswered.

virtual bool	failureDetected () const
	Checks if the partner failure has been detected based on the DHCP traffic analysis.

virtual size_t	getConnectingClientsCount () const
	Returns the current number of clients which attempted to get a lease from the partner server.

virtual size_t	getUnackedClientsCount () const
	Returns the current number of clients which haven't gotten a lease from the partner server.

Public Member Functions inherited from isc::ha::CommunicationState
	CommunicationState (const asiolink::IOServicePtr &io_service, const HAConfigPtr &config)
	Constructor.

virtual	~CommunicationState ()
	Destructor.

virtual void	analyzeMessage (const boost::shared_ptr< dhcp::Pkt > &message)=0
	Checks if the DHCP message appears to be unanswered.

void	clearRejectedLeaseUpdates ()
	Clears rejected client leases (MT safe).

bool	clockSkewShouldTerminate ()
	Indicates whether the HA service should enter "terminated" state as a result of the clock skew exceeding maximum value.

bool	clockSkewShouldWarn ()
	Issues a warning about high clock skew between the active servers if one is warranted.

virtual bool	failureDetected () const =0
	Checks if the partner failure has been detected based on the DHCP traffic analysis.

size_t	getAnalyzedMessagesCount () const
	Returns the number of analyzed messages while being in the communications interrupted state.

virtual size_t	getConnectingClientsCount () const =0
	Returns the current number of clients which attempted to get a lease from the partner server.

int64_t	getDurationInMillisecs () const
	Returns duration between the poke time and current time.

boost::posix_time::time_duration	getDurationSincePartnerStateTime () const
	Returns the duration since the partner was first seen in the current state.

std::set< std::string >	getPartnerScopes () const
	Returns scopes served by the partner server.

int	getPartnerState () const
	Returns last known state of the partner.

size_t	getRejectedLeaseUpdatesCount ()
	Returns the number of lease updates rejected by the partner (MT safe).

data::ElementPtr	getReport () const
	Returns the report about current communication state.

virtual size_t	getUnackedClientsCount () const =0
	Returns the current number of clients which haven't got the lease from the partner server.

uint64_t	getUnsentUpdateCount () const
	Returns a total number of unsent lease updates.

bool	hasPartnerNewUnsentUpdates () const
	Checks if the partner allocated new leases for which it hasn't sent any lease updates.

void	increaseUnsentUpdateCount ()
	Increases a total number of unsent lease updates by 1.

bool	isCommunicationInterrupted () const
	Checks if communication with the partner is interrupted.

bool	isHeartbeatRunning () const
	Checks if recurring heartbeat is running.

std::string	logFormatClockSkew () const
	Returns current clock skew value in the logger friendly format.

void	modifyPokeTime (const long secs)
	Modifies poke time by adding seconds to it.

void	poke ()
	Pokes the communication state.

bool	rejectedLeaseUpdatesShouldTerminate ()
	Indicates whether the HA service should enter "terminated" state due to excessive number of rejected lease updates.

bool	reportRejectedLeaseUpdate (const dhcp::PktPtr &message, const uint32_t lifetime=86400)
	Marks that the lease update failed due to a conflict for the specified DHCP message (MT safe).

bool	reportSuccessfulLeaseUpdate (const dhcp::PktPtr &message)
	Marks the lease update successful (MT safe).

void	setPartnerScopes (data::ConstElementPtr new_scopes)
	Sets partner scopes.

void	setPartnerState (const std::string &state)
	Sets partner state.

void	setPartnerTime (const std::string &time_text)
	Provide partner's notion of time so the new clock skew can be calculated.

void	setPartnerUnavailable ()
	Sets partner state unavailable.

void	setPartnerUnsentUpdateCount (uint64_t unsent_update_count)
	Saves new total number of unsent lease updates from the partner.

void	startHeartbeat (const long interval, const std::function< void()> &heartbeat_impl)
	Starts recurring heartbeat (public interface).

void	stopHeartbeat ()
	Stops recurring heartbeat.

Protected Types
template<typename ClientData >
using	ClientIdent4 = boost::multi_index::hashed_unique< boost::multi_index::composite_key< ClientData, boost::multi_index::member< ClientData, std::vector< uint8_t >, &ClientData::hwaddr_ >, boost::multi_index::member< ClientData, std::vector< uint8_t >, &ClientData::clientid_ > > >
	Hashed index used in the multi index containers to find clients by HW address and client identifier.

typedef boost::multi_index_container< ConnectingClient4, boost::multi_index::indexed_by< ClientIdent4< ConnectingClient4 >, boost::multi_index::ordered_non_unique< boost::multi_index::member< ConnectingClient4, bool, &ConnectingClient4::unacked_ > > > >	ConnectingClients4
	Multi index container holding information about the clients attempting to get leases from the partner server.

typedef boost::multi_index_container< RejectedClient4, boost::multi_index::indexed_by< ClientIdent4< RejectedClient4 >, boost::multi_index::ordered_non_unique< boost::multi_index::member< RejectedClient4, int64_t, &RejectedClient4::expire_ > > > >	RejectedClients4
	Multi index container holding information about the clients who have rejected leases.

Protected Member Functions
virtual void	analyzeMessageInternal (const boost::shared_ptr< dhcp::Pkt > &message)
	Checks if the DHCPv4 message appears to be unanswered.

virtual void	clearConnectingClients ()
	Removes information about the clients the partner server should respond to while communication with the partner was interrupted.

virtual void	clearRejectedLeaseUpdatesInternal ()
	Clears rejected client leases.

virtual bool	failureDetectedInternal () const
	Checks if the partner failure has been detected based on the DHCP traffic analysis.

virtual size_t	getRejectedLeaseUpdatesCountInternal ()
	Returns the number of lease updates rejected by the partner.

virtual bool	reportRejectedLeaseUpdateInternal (const dhcp::PktPtr &message, const uint32_t lifetime)
	Marks that the lease update failed due to a conflict for the specified DHCP message.

virtual bool	reportSuccessfulLeaseUpdateInternal (const dhcp::PktPtr &message)
	Marks the lease update successful.

Protected Member Functions inherited from isc::ha::CommunicationState
virtual void	clearConnectingClients ()=0
	Removes information about the clients the partner server should respond to while communication with the partner was interrupted.

virtual void	clearRejectedLeaseUpdatesInternal ()=0
	Clears rejected client leases.

virtual size_t	getRejectedLeaseUpdatesCountInternal ()=0
	Returns the number of lease updates rejected by the partner.

virtual bool	reportRejectedLeaseUpdateInternal (const dhcp::PktPtr &message, const uint32_t lifetime)=0
	Marks that the lease update failed due to a conflict for the specified DHCP message.

virtual bool	reportSuccessfulLeaseUpdateInternal (const dhcp::PktPtr &message)=0
	Marks the lease update successful.

boost::posix_time::time_duration	updatePokeTime ()
	Update the poke time and compute the duration.

Protected Attributes
ConnectingClients4	connecting_clients_
	Holds information about the clients attempting to contact the partner server while the servers are in communications interrupted state.

RejectedClients4	rejected_clients_
	Holds information about the clients for whom lease updates have been rejected by the partner.

Protected Attributes inherited from isc::ha::CommunicationState
size_t	analyzed_messages_count_
	Total number of analyzed messages to be responded by partner.

boost::posix_time::time_duration	clock_skew_
	Clock skew between the active servers.

HAConfigPtr	config_
	High availability configuration.

std::function< void()>	heartbeat_impl_
	Pointer to the function providing heartbeat implementation.

long	interval_
	Interval specified for the heartbeat.

asiolink::IOServicePtr	io_service_
	Pointer to the common IO service instance.

boost::posix_time::ptime	last_clock_skew_warn_
	Holds a time when last warning about too high clock skew was issued.

const boost::scoped_ptr< std::mutex >	mutex_
	The mutex used to protect internal state.

boost::posix_time::ptime	my_time_at_skew_
	My time when skew was calculated.

std::set< std::string >	partner_scopes_
	Last known set of scopes served by the partner server.

int	partner_state_
	Last known state of the partner server.

boost::posix_time::ptime	partner_state_time_
	Holds a time when partner was first seen in the current state.

boost::posix_time::ptime	partner_time_at_skew_
	Partner reported time when skew was calculated.

std::pair< uint64_t, uint64_t >	partner_unsent_update_count_
	Previous and current total number of unsent lease updates from the partner.

boost::posix_time::ptime	poke_time_
	Last poke time.

asiolink::IntervalTimerPtr	timer_
	Interval timer triggering heartbeat commands.

uint64_t	unsent_update_count_
	Total number of unsent lease updates.

Additional Inherited Members
Static Protected Member Functions inherited from isc::ha::CommunicationState
static std::vector< uint8_t >	getClientId (const dhcp::PktPtr &message, const uint16_t option_type)
	Convenience function attempting to retrieve client identifier from the DHCP message.

template<typename RejectedClientsType >
static size_t	getRejectedLeaseUpdatesCountFromContainer (RejectedClientsType &rejected_clients)
	Extracts the number of lease updates rejected by the partner from the specified container.

Detailed Description

Holds communication state between DHCPv4 servers.

This class implements DHCPv4 failure detection by monitoring the value of the "secs" field in received DHCPv4 messages as described in CommunicationState::analyzeMessage.

Definition at line 778 of file communication_state.h.

Member Typedef Documentation

◆ ClientIdent4

template<typename ClientData >

using isc::ha::CommunicationState4::ClientIdent4 = boost::multi_index::hashed_unique< boost::multi_index::composite_key< ClientData, boost::multi_index::member<ClientData, std::vector<uint8_t>, &ClientData::hwaddr_>, boost::multi_index::member<ClientData, std::vector<uint8_t>, &ClientData::clientid_> > >

protected

Hashed index used in the multi index containers to find clients by HW address and client identifier.

Template Parameters

ClientData Type of a structure holding client information.

Definition at line 910 of file communication_state.h.

◆ ConnectingClients4

typedef boost::multi_index_container< ConnectingClient4, boost::multi_index::indexed_by< ClientIdent4<ConnectingClient4>, boost::multi_index::ordered_non_unique< boost::multi_index::member<ConnectingClient4, bool, &ConnectingClient4::unacked_> > > > isc::ha::CommunicationState4::ConnectingClients4

protected

Multi index container holding information about the clients attempting to get leases from the partner server.

Definition at line 942 of file communication_state.h.

◆ RejectedClients4

typedef boost::multi_index_container< RejectedClient4, boost::multi_index::indexed_by< ClientIdent4<RejectedClient4>, boost::multi_index::ordered_non_unique< boost::multi_index::member<RejectedClient4, int64_t, &RejectedClient4::expire_> > > > isc::ha::CommunicationState4::RejectedClients4

protected

Multi index container holding information about the clients who have rejected leases.

Definition at line 968 of file communication_state.h.

Constructor & Destructor Documentation

◆ CommunicationState4()

isc::ha::CommunicationState4::CommunicationState4	(	const asiolink::IOServicePtr &	io_service,
		const HAConfigPtr &	config
	)

Constructor.

Parameters

io_service	pointer to the common IO service instance.
config	pointer to the HA configuration.

Definition at line 654 of file communication_state.cc.

Member Function Documentation

◆ analyzeMessage()

void isc::ha::CommunicationState4::analyzeMessage ( const boost::shared_ptr< dhcp::Pkt > & message )

virtual

Checks if the DHCPv4 message appears to be unanswered.

This method uses "secs" field value for detecting client communication failures as described in the CommunicationState::analyzeMessage. Some misbehaving Windows clients were reported to swap "secs" field bytes. In this case the first byte is set to non-zero byte and the second byte is set to 0. This method handles such cases and corrects bytes order before comparing against the threshold.

Parameters

message DHCPv4 message to be analyzed. This must be the message which belongs to the partner, i.e. the caller must filter out messages belonging to the partner prior to calling this method.

Implements isc::ha::CommunicationState.

Definition at line 661 of file communication_state.cc.

References analyzeMessageInternal(), isc::util::MultiThreadingMgr::instance(), and isc::ha::CommunicationState::mutex_.

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◆ analyzeMessageInternal()

void isc::ha::CommunicationState4::analyzeMessageInternal ( const boost::shared_ptr< dhcp::Pkt > & message )

protectedvirtual

Checks if the DHCPv4 message appears to be unanswered.

Should be called in a thread safe context.

This method uses "secs" field value for detecting client communication failures as described in the CommunicationState::analyzeMessage. Some misbehaving Windows clients were reported to swap "secs" field bytes. In this case the first byte is set to non-zero byte and the second byte is set to 0. This method handles such cases and corrects bytes order before comparing against the threshold.

Parameters

message DHCPv4 message to be analyzed. This must be the message which belongs to the partner, i.e. the caller must filter out messages belonging to the partner prior to calling this method.

Definition at line 671 of file communication_state.cc.

References isc::ha::CommunicationState::analyzed_messages_count_, isc::ha::CommunicationState::config_, connecting_clients_, isc::dhcp::DHO_DHCP_CLIENT_IDENTIFIER, isc::ha::CommunicationState::getClientId(), isc::ha::HA_COMMUNICATION_INTERRUPTED_CLIENT4, isc::ha::HA_COMMUNICATION_INTERRUPTED_CLIENT4_UNACKED, isc::ha::ha_logger, isc::ha::CommunicationState4::ConnectingClient4::hwaddr_, isc_throw, and LOG_INFO.

Referenced by analyzeMessage().

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◆ clearConnectingClients()

void isc::ha::CommunicationState4::clearConnectingClients ( )

protectedvirtual

Removes information about the clients the partner server should respond to while communication with the partner was interrupted.

See CommunicationState::analyzeMessage for details.

Implements isc::ha::CommunicationState.

Definition at line 786 of file communication_state.cc.

References connecting_clients_.

◆ clearRejectedLeaseUpdatesInternal()

void isc::ha::CommunicationState4::clearRejectedLeaseUpdatesInternal ( )

protectedvirtual

Clears rejected client leases.

Implements isc::ha::CommunicationState.

Definition at line 832 of file communication_state.cc.

References rejected_clients_.

◆ failureDetected()

bool isc::ha::CommunicationState4::failureDetected ( ) const

virtual

Checks if the partner failure has been detected based on the DHCP traffic analysis.

Returns: true if the partner failure has been detected, false otherwise.

Implements isc::ha::CommunicationState.

Definition at line 749 of file communication_state.cc.

References failureDetectedInternal(), isc::util::MultiThreadingMgr::instance(), and isc::ha::CommunicationState::mutex_.

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◆ failureDetectedInternal()

bool isc::ha::CommunicationState4::failureDetectedInternal ( ) const

protectedvirtual

Checks if the partner failure has been detected based on the DHCP traffic analysis.

Should be called in a thread safe context.

Returns: true if the partner failure has been detected, false otherwise.

Definition at line 759 of file communication_state.cc.

References isc::ha::CommunicationState::config_, and connecting_clients_.

Referenced by failureDetected().

◆ getConnectingClientsCount()

size_t isc::ha::CommunicationState4::getConnectingClientsCount ( ) const

virtual

Returns the current number of clients which attempted to get a lease from the partner server.

The returned number is reset to 0 when the server successfully establishes communication with the partner. The number is incremented only in the communications interrupted case.

Returns: The number of clients including unacked clients.

Implements isc::ha::CommunicationState.

Definition at line 766 of file communication_state.cc.

References connecting_clients_, isc::util::MultiThreadingMgr::instance(), and isc::ha::CommunicationState::mutex_.

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◆ getRejectedLeaseUpdatesCountInternal()

size_t isc::ha::CommunicationState4::getRejectedLeaseUpdatesCountInternal ( )

protectedvirtual

Returns the number of lease updates rejected by the partner.

Each rejected lease update is counted only once if it failed multiple times. Before returning the counter, it discards expired rejected lease updates.

Returns: Current rejected lease update number count.

Implements isc::ha::CommunicationState.

Definition at line 791 of file communication_state.cc.

References isc::ha::CommunicationState::getRejectedLeaseUpdatesCountFromContainer(), and rejected_clients_.

Referenced by reportSuccessfulLeaseUpdateInternal().

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◆ getUnackedClientsCount()

size_t isc::ha::CommunicationState4::getUnackedClientsCount ( ) const

virtual

Returns the current number of clients which haven't gotten a lease from the partner server.

The returned number is reset to 0 when the server successfully establishes communication with the partner. The number is incremented only in the communications interrupted case.

Returns: Number of unacked clients.

Implements isc::ha::CommunicationState.

Definition at line 776 of file communication_state.cc.

References connecting_clients_, isc::util::MultiThreadingMgr::instance(), and isc::ha::CommunicationState::mutex_.

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◆ reportRejectedLeaseUpdateInternal()

bool isc::ha::CommunicationState4::reportRejectedLeaseUpdateInternal	(	const dhcp::PktPtr &	message,
		const uint32_t	lifetime
	)

protectedvirtual

Marks that the lease update failed due to a conflict for the specified DHCP message.

If the conflict has been already reported for the given client, the rejected lease count remains unchanged.

Parameters

message	DHCP message for which a lease update failed due to a conflict.
lifetime	a time in seconds after which the rejected lease update entry should be discarded.

Returns: true if the update was rejected for the first time, false otherwise.

Implements isc::ha::CommunicationState.

Definition at line 796 of file communication_state.cc.

References isc::dhcp::DHO_DHCP_CLIENT_IDENTIFIER, isc::ha::CommunicationState::getClientId(), isc::ha::CommunicationState4::RejectedClient4::hwaddr_, isc_throw, and rejected_clients_.

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◆ reportSuccessfulLeaseUpdateInternal()

bool isc::ha::CommunicationState4::reportSuccessfulLeaseUpdateInternal ( const dhcp::PktPtr & message )

protectedvirtual

Marks the lease update successful.

If the lease update was previously marked "in conflict", it is now cleared, effectively lowering the number of conflicted leases.

Parameters

message DHCP message for which the lease update was successful.

Returns: true when the lease was marked "in conflict" and it is now cleared.

Implements isc::ha::CommunicationState.

Definition at line 813 of file communication_state.cc.

References isc::dhcp::DHO_DHCP_CLIENT_IDENTIFIER, isc::ha::CommunicationState::getClientId(), getRejectedLeaseUpdatesCountInternal(), isc_throw, and rejected_clients_.

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Member Data Documentation

◆ connecting_clients_

ConnectingClients4 isc::ha::CommunicationState4::connecting_clients_

protected

Holds information about the clients attempting to contact the partner server while the servers are in communications interrupted state.

Definition at line 947 of file communication_state.h.

Referenced by analyzeMessageInternal(), clearConnectingClients(), failureDetectedInternal(), getConnectingClientsCount(), and getUnackedClientsCount().

◆ rejected_clients_

RejectedClients4 isc::ha::CommunicationState4::rejected_clients_

protected

Holds information about the clients for whom lease updates have been rejected by the partner.

Definition at line 972 of file communication_state.h.

Referenced by clearRejectedLeaseUpdatesInternal(), getRejectedLeaseUpdatesCountInternal(), reportRejectedLeaseUpdateInternal(), and reportSuccessfulLeaseUpdateInternal().

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

Classes

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ ClientIdent4

◆ ConnectingClients4

◆ RejectedClients4

Constructor & Destructor Documentation

◆ CommunicationState4()

Member Function Documentation

◆ analyzeMessage()

◆ analyzeMessageInternal()

◆ clearConnectingClients()

◆ clearRejectedLeaseUpdatesInternal()

◆ failureDetected()

◆ failureDetectedInternal()

◆ getConnectingClientsCount()

◆ getRejectedLeaseUpdatesCountInternal()

◆ getUnackedClientsCount()

◆ reportRejectedLeaseUpdateInternal()

◆ reportSuccessfulLeaseUpdateInternal()

Member Data Documentation

◆ connecting_clients_

◆ rejected_clients_