MySQL Host Data Source. More...

#include <mysql_host_data_source.h>

Inheritance diagram for isc::dhcp::MySqlHostDataSource:

Public Member Functions
	MySqlHostDataSource (const db::DatabaseConnection::ParameterMap &parameters)
	Constructor. More...

virtual	~MySqlHostDataSource ()
	Virtual destructor. More...

virtual void	add (const HostPtr &host)
	Adds a new host to the collection. More...

virtual void	commit ()
	Commit Transactions. More...

virtual bool	del (const SubnetID &subnet_id, const asiolink::IOAddress &addr)
	Attempts to delete a host by (subnet-id, address) More...

virtual bool	del4 (const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len)
	Attempts to delete a host by (subnet4-id, identifier type, identifier) More...

virtual bool	del6 (const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len)
	Attempts to delete a host by (subnet6-id, identifier type, identifier) More...

virtual ConstHostPtr	get4 (const SubnetID &subnet_id, const asiolink::IOAddress &address) const
	Returns a host connected to the IPv4 subnet and having a reservation for a specified IPv4 address. More...

virtual ConstHostPtr	get4 (const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len) const
	Returns a host connected to the IPv4 subnet. More...

virtual ConstHostPtr	get6 (const asiolink::IOAddress &prefix, const uint8_t prefix_len) const
	Returns a host using the specified IPv6 prefix. More...

virtual ConstHostPtr	get6 (const SubnetID &subnet_id, const asiolink::IOAddress &address) const
	Returns a host connected to the IPv6 subnet and having a reservation for a specified IPv6 address or prefix. More...

virtual ConstHostPtr	get6 (const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len) const
	Returns a host connected to the IPv6 subnet. More...

virtual ConstHostCollection	getAll (const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len) const
	Return all hosts connected to any subnet for which reservations have been made using a specified identifier. More...

virtual ConstHostCollection	getAll4 (const asiolink::IOAddress &address) const
	Returns a collection of hosts using the specified IPv4 address. More...

virtual std::string	getDescription () const
	Returns description of the backend. More...

virtual std::string	getName () const
	Returns backend name. More...

virtual std::string	getType () const
	Return backend type. More...

virtual std::pair< uint32_t, uint32_t >	getVersion () const
	Returns backend version. More...

virtual void	rollback ()
	Rollback Transactions. More...

Public Member Functions inherited from isc::dhcp::BaseHostDataSource
virtual	~BaseHostDataSource ()
	Default destructor implementation. More...

Additional Inherited Members
Public Types inherited from isc::dhcp::BaseHostDataSource
enum	IdType { ID_HWADDR = 0, ID_DUID = 1 }
	Specifies the type of an identifier. More...

Detailed Description

MySQL Host Data Source.

This class implements the isc::dhcp::BaseHostDataSource interface to the MySQL database. Use of this backend presupposes that a MySQL database is available and that the Kea schema has been created within it.

Definition at line 30 of file mysql_host_data_source.h.

Constructor & Destructor Documentation

◆ MySqlHostDataSource()

isc::dhcp::MySqlHostDataSource::MySqlHostDataSource ( const db::DatabaseConnection::ParameterMap & parameters )

Constructor.

Uses the following keywords in the parameters passed to it to connect to the database:

name - Name of the database to which to connect (mandatory)
host - Host to which to connect (optional, defaults to "localhost")
user - Username under which to connect (optional)
password - Password for "user" on the database (optional)

If the database is successfully opened, the version number in the schema_version table will be checked against hard-coded value in the implementation file.

Finally, all the SQL commands are pre-compiled.

Parameters

parameters A data structure relating keywords and values concerned with the database.

Exceptions

isc::dhcp::NoDatabaseName	Mandatory database name not given
isc::db::DbOpenError	Error opening the database or the schema version is invalid.
isc::db::DbOperationError	An operation on the open database has failed.

Definition at line 2680 of file mysql_host_data_source.cc.

◆ ~MySqlHostDataSource()

isc::dhcp::MySqlHostDataSource::~MySqlHostDataSource ( )

virtual

Virtual destructor.

Releases prepared MySQL statements used by the backend.

Definition at line 2685 of file mysql_host_data_source.cc.

Member Function Documentation

◆ add()

void isc::dhcp::MySqlHostDataSource::add ( const HostPtr & host )

virtual

Adds a new host to the collection.

The implementations of this method should guard against duplicate reservations for the same host, where possible. For example, when the reservation for the same HW address and subnet id is added twice, the addHost method should throw an DuplicateEntry exception. Note, that usually it is impossible to guard against adding duplicated host, where one instance is identified by HW address, another one by DUID.

Parameters

host	Pointer to the new `Host` object being added.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2690 of file mysql_host_data_source.cc.

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◆ commit()

void isc::dhcp::MySqlHostDataSource::commit ( )

virtual

Commit Transactions.

Commits all pending database operations.

Reimplemented from isc::dhcp::BaseHostDataSource.

Definition at line 3042 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::checkReadOnly(), isc::db::MySqlConnection::commit(), and isc::dhcp::MySqlHostDataSourceImpl::conn_.

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◆ del()

bool isc::dhcp::MySqlHostDataSource::del	(	const SubnetID &	subnet_id,
		const asiolink::IOAddress &	addr
	)

virtual

Attempts to delete a host by (subnet-id, address)

This method supports both v4 and v6.

Parameters

subnet_id	subnet identifier.
addr	specified address.

Returns: true if deletion was successful, false if the host was not there.

Exceptions

various exceptions in case of errors

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2737 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::checkReadOnly(), del6(), isc::dhcp::MySqlHostDataSourceImpl::DEL_HOST_ADDR4, isc::dhcp::MySqlHostDataSourceImpl::delStatement(), get6(), isc::asiolink::IOAddress::isV4(), isc::db::MLM_TRUE, and isc::asiolink::IOAddress::toUint32().

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◆ del4()

bool isc::dhcp::MySqlHostDataSource::del4	(	const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)

virtual

Attempts to delete a host by (subnet4-id, identifier type, identifier)

This method supports v4 hosts only.

Parameters

subnet_id	subnet identifier.
identifier_type	Identifier type.
identifier_begin	Pointer to a beginning of a buffer containing an identifier.
identifier_len	Identifier length.

Returns: true if deletion was successful, false if the host was not there.

Exceptions

various exceptions in case of errors

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2772 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::checkReadOnly(), isc::dhcp::MySqlHostDataSourceImpl::DEL_HOST_SUBID4_ID, isc::dhcp::MySqlHostDataSourceImpl::delStatement(), and isc::db::MLM_TRUE.

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◆ del6()

bool isc::dhcp::MySqlHostDataSource::del6	(	const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)

virtual

Attempts to delete a host by (subnet6-id, identifier type, identifier)

This method supports v6 hosts only.

Parameters

subnet_id	subnet identifier.
identifier_type	Identifier type.
identifier_begin	Pointer to a beginning of a buffer containing an identifier.
identifier_len	Identifier length.

Returns: true if deletion was successful, false if the host was not there.

Exceptions

various exceptions in case of errors

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2808 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::checkReadOnly(), isc::dhcp::MySqlHostDataSourceImpl::DEL_HOST_SUBID6_ID, isc::dhcp::MySqlHostDataSourceImpl::delStatement(), and isc::db::MLM_TRUE.

Referenced by del().

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◆ get4() [1/2]

ConstHostPtr isc::dhcp::MySqlHostDataSource::get4	(	const SubnetID &	subnet_id,
		const asiolink::IOAddress &	address
	)		const

virtual

Returns a host connected to the IPv4 subnet and having a reservation for a specified IPv4 address.

One of the use cases for this method is to detect collisions between dynamically allocated addresses and reserved addresses. When the new address is assigned to a client, the allocation mechanism should check if this address is not reserved for some other host and do not allocate this address if reservation is present.

Implementations of this method should guard against invalid addresses, such as IPv6 address.

Parameters

subnet_id	Subnet identifier.
address	reserved IPv4 address.

Returns: Const Host object using a specified IPv4 address.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2904 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::GET_HOST_SUBID_ADDR, isc::dhcp::MySqlHostDataSourceImpl::getHostCollection(), isc::dhcp::MySqlHostDataSourceImpl::host_exchange_, isc_throw, isc::asiolink::IOAddress::isV4(), isc::db::MLM_TRUE, and isc::asiolink::IOAddress::toUint32().

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◆ get4() [2/2]

ConstHostPtr isc::dhcp::MySqlHostDataSource::get4	(	const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)		const

virtual

Returns a host connected to the IPv4 subnet.

Parameters

subnet_id	Subnet identifier.
identifier_type	Identifier type.
identifier_begin	Pointer to a beginning of a buffer containing an identifier.
identifier_len	Identifier length.

Returns: Const Host object for which reservation has been made using the specified identifier.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2893 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::GET_HOST_SUBID4_DHCPID, isc::dhcp::MySqlHostDataSourceImpl::getHost(), and isc::dhcp::MySqlHostDataSourceImpl::host_exchange_.

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◆ get6() [1/3]

ConstHostPtr isc::dhcp::MySqlHostDataSource::get6	(	const asiolink::IOAddress &	prefix,
		const uint8_t	prefix_len
	)		const

virtual

Returns a host using the specified IPv6 prefix.

Parameters

prefix	IPv6 prefix for which the `Host` object is searched.
prefix_len	IPv6 prefix length.

Returns: Const Host object using a specified IPv6 prefix.

Todo:: : Check that prefix is v6 address, not v4.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2949 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::GET_HOST_PREFIX, isc::dhcp::MySqlHostDataSourceImpl::getHostCollection(), isc::dhcp::MySqlHostDataSourceImpl::host_ipv6_exchange_, isc::db::MLM_TRUE, and isc::asiolink::IOAddress::toText().

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◆ get6() [2/3]

ConstHostPtr isc::dhcp::MySqlHostDataSource::get6	(	const SubnetID &	subnet_id,
		const asiolink::IOAddress &	address
	)		const

virtual

Returns a host connected to the IPv6 subnet and having a reservation for a specified IPv6 address or prefix.

Parameters

subnet_id	Subnet identifier.
address	reserved IPv6 address/prefix.

Returns: Const Host object using a specified IPv6 address/prefix.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2986 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::GET_HOST_SUBID6_ADDR, isc::dhcp::MySqlHostDataSourceImpl::getHostCollection(), isc::dhcp::MySqlHostDataSourceImpl::host_ipv6_exchange_, isc::db::MLM_TRUE, and isc::asiolink::IOAddress::toText().

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◆ get6() [3/3]

ConstHostPtr isc::dhcp::MySqlHostDataSource::get6	(	const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)		const

virtual

Returns a host connected to the IPv6 subnet.

Parameters

subnet_id	Subnet identifier.
identifier_type	Identifier type.
identifier_begin	Pointer to a beginning of a buffer containing an identifier.
identifier_len	Identifier length.

Returns: Const Host object for which reservation has been made using the specified identifier.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2938 of file mysql_host_data_source.cc.

References isc::dhcp::MySqlHostDataSourceImpl::GET_HOST_SUBID6_DHCPID, isc::dhcp::MySqlHostDataSourceImpl::getHost(), and isc::dhcp::MySqlHostDataSourceImpl::host_ipv6_exchange_.

Referenced by del().

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◆ getAll()

ConstHostCollection isc::dhcp::MySqlHostDataSource::getAll	(	const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)		const

virtual

Return all hosts connected to any subnet for which reservations have been made using a specified identifier.

This method returns all Host objects which represent reservations for a specified identifier. This method may return multiple hosts because a particular client may have reservations in multiple subnets.

Parameters