Represents DHCPv6 Encrypted DNS Option (code 144). More...

#include <option6_dnr.h>

Inheritance diagram for isc::dhcp::Option6Dnr:

Public Member Functions
	Option6Dnr (OptionBufferConstIter begin, OptionBufferConstIter end, bool convenient_notation=false)
	Constructor of the Option from on-wire data.

OptionPtr	clone () const override
	Copies this option and returns a pointer to the copy.

uint16_t	len () const override
	Returns length of the complete option (data length + DHCPv4/DHCPv6 option header)

void	pack (util::OutputBuffer &buf, bool check=false) const override
	Writes option in wire-format to a buffer.

void	packAddresses (isc::util::OutputBuffer &buf) const override
	Writes the IP address(es) in the wire format into a buffer.

std::string	toText (int indent=0) const override
	Returns string representation of the option.

void	unpack (OptionBufferConstIter begin, OptionBufferConstIter end) override
	Parses received wire data buffer.

void	unpackAddresses (OptionBufferConstIter &begin, OptionBufferConstIter end) override
	Unpacks IP address(es) from wire data and stores it/them in `ip_addresses_`.

Public Member Functions inherited from isc::dhcp::Option
	Option (const Option &source)
	Copy constructor.

	Option (Universe u, uint16_t type)
	ctor, used for options constructed, usually during transmission

	Option (Universe u, uint16_t type, const OptionBuffer &data)
	Constructor, used for received options.

	Option (Universe u, uint16_t type, OptionBufferConstIter first, OptionBufferConstIter last)
	Constructor, used for received options.

virtual	~Option ()
	just to force that every option has virtual dtor

void	addOption (OptionPtr opt)
	Adds a sub-option.

virtual OptionPtr	clone () const
	Copies this option and returns a pointer to the copy.

bool	delOption (uint16_t type)
	Attempts to delete first suboption of requested type.

virtual bool	equals (const Option &other) const
	Checks if two options are equal.

bool	equals (const OptionPtr &other) const
	Checks if options are equal.

virtual const OptionBuffer &	getData () const
	Returns pointer to actual data.

std::string	getEncapsulatedSpace () const
	Returns the name of the option space encapsulated by this option.

virtual uint16_t	getHeaderLen () const
	Returns length of header (2 for v4, 4 for v6)

OptionCollection &	getMutableOptions ()
	Returns all encapsulated options.

OptionPtr	getOption (uint16_t type) const
	Returns shared_ptr to suboption of specific type.

const OptionCollection &	getOptions () const
	Returns all encapsulated options.

void	getOptionsCopy (OptionCollection &options_copy) const
	Performs deep copy of suboptions.

uint16_t	getType () const
	Returns option type (0-255 for DHCPv4, 0-65535 for DHCPv6)

uint16_t	getUint16 () const
	Returns content of first word.

uint32_t	getUint32 () const
	Returns content of first double word.

uint8_t	getUint8 () const
	Returns content of first byte.

Universe	getUniverse () const
	returns option universe (V4 or V6)

virtual uint16_t	len () const
	Returns length of the complete option (data length + DHCPv4/DHCPv6 option header)

Option &	operator= (const Option &rhs)
	Assignment operator.

virtual void	pack (isc::util::OutputBuffer &buf, bool check=true) const
	Writes option in wire-format to a buffer.

template<typename InputIterator >
void	setData (InputIterator first, InputIterator last)
	Sets content of this option from buffer.

void	setEncapsulatedSpace (const std::string &encapsulated_space)
	Sets the name of the option space encapsulated by this option.

void	setUint16 (uint16_t value)
	Sets content of this option to a single uint16 value.

void	setUint32 (uint32_t value)
	Sets content of this option to a single uint32 value.

void	setUint8 (uint8_t value)
	Sets content of this option to a single uint8 value.

virtual std::vector< uint8_t >	toBinary (const bool include_header=false) const
	Returns binary representation of the option.

virtual std::string	toHexString (const bool include_header=false) const
	Returns string containing hexadecimal representation of option.

virtual std::string	toString () const
	Returns string representation of the value.

virtual std::string	toText (int indent=0) const
	Returns string representation of the option.

virtual void	unpack (OptionBufferConstIter begin, OptionBufferConstIter end)
	Parses received buffer.

virtual bool	valid () const
	returns if option is valid (e.g.

Public Member Functions inherited from isc::dhcp::DnrInstance
	DnrInstance (Option::Universe universe)
	Constructor of the empty DNR Instance.

virtual	~DnrInstance ()=default
	Default destructor.

void	addIpAddress (const asiolink::IOAddress &ip_address)
	Adds IP address to `ip_addresses_` container.

AddressContainer	getAddresses () const
	Returns vector with addresses.

uint16_t	getAddrLength () const
	Getter of the `addr_length_`.

uint8_t	getAddrLengthSize () const
	Returns size in octets of Addr Length field.

std::string	getAdnAsText () const
	Returns the Authentication domain name in the text format.

uint16_t	getAdnLength () const
	Getter of the `adn_length_`.

uint8_t	getAdnLengthSize () const
	Returns size in octets of ADN Length field.

std::string	getDnrInstanceAsText () const
	Returns string representation of the DNR instance.

uint16_t	getDnrInstanceDataLength () const
	Getter of the `dnr_instance_data_length_`.

uint8_t	getDnrInstanceDataLengthSize () const
	Returns size in octets of DNR Instance Data Length field.

std::string	getLogPrefix () const
	Returns Log prefix depending on V4/V6 Option universe.

uint8_t	getMinimalLength () const
	Returns minimal length of the DNR instance data (without headers) in octets.

uint16_t	getServicePriority () const
	Getter of the `service_priority_`.

const OptionBuffer &	getSvcParams () const
	Returns a reference to the buffer holding SvcParam data.

uint16_t	getSvcParamsLength () const
	Getter of the `svc_params_length_`.

bool	isAdnOnlyMode () const
	Returns whether ADN only mode is enabled or disabled.

virtual void	packAddresses (isc::util::OutputBuffer &buf) const
	Writes the IP address(es) in the wire format into a buffer.

void	packAdn (isc::util::OutputBuffer &buf) const
	Writes the ADN FQDN in the wire format into a buffer.

void	packSvcParams (isc::util::OutputBuffer &buf) const
	Writes the Service Parameters in the wire format into a buffer.

void	parseDnrInstanceConfigData (const std::string &config_txt)
	Parses a convenient notation of the option data, which may be used in config.

void	setAdnOnlyMode (bool adn_only_mode)
	Setter of the `adn_only_mode_` field.

void	setDnrInstanceDataLength ()
	Setter of the `dnr_instance_data_length_` field.

virtual void	unpackAddresses (OptionBufferConstIter &begin, OptionBufferConstIter end)
	Unpacks IP address(es) from wire data and stores it/them in `ip_addresses_`.

void	unpackAdn (OptionBufferConstIter &begin, OptionBufferConstIter end)
	Unpacks the ADN from given wire data buffer and stores it in `adn_` field.

void	unpackDnrInstanceDataLength (OptionBufferConstIter &begin, OptionBufferConstIter end)
	Unpacks DNR Instance Data Length from wire data buffer and stores it in `dnr_instance_data_length_`.

void	unpackServicePriority (OptionBufferConstIter &begin)
	Unpacks Service Priority from wire data buffer and stores it in `service_priority_`.

void	unpackSvcParams (OptionBufferConstIter &begin, OptionBufferConstIter end)
	Unpacks Service Parameters from wire data buffer and stores it in `svc_params_buf_`.

Additional Inherited Members
Public Types inherited from isc::dhcp::Option
typedef OptionPtr	Factory(Option::Universe u, uint16_t type, const OptionBuffer &buf)
	a factory function prototype

enum	Universe { V4 , V6 }
	defines option universe DHCPv4 or DHCPv6 More...

Public Types inherited from isc::dhcp::DnrInstance
typedef std::vector< isc::asiolink::IOAddress >	AddressContainer
	A Type defined for container holding IP addresses.

typedef boost::bimap< std::string, uint16_t >	SvcParamsMap
	A Type defined for boost Bimap holding SvcParamKeys.

Static Public Member Functions inherited from isc::dhcp::Option
static OptionPtr	create (Universe u, uint16_t type)
	Factory function creating an instance of the `Option`.

static OptionPtr	create (Universe u, uint16_t type, const OptionBuffer &data)
	Factory function creating an instance of the `Option`.

static OptionPtr	factory (Option::Universe u, uint16_t type)
	Factory function to create instance of option.

static OptionPtr	factory (Option::Universe u, uint16_t type, const OptionBuffer &buf)
	Factory function to create instance of option.

Static Public Attributes inherited from isc::dhcp::Option
static bool	lenient_parsing_
	Governs whether options should be parsed less strictly.

static const size_t	OPTION4_HDR_LEN = 2
	length of the usual DHCPv4 option header (there are exceptions)

static const size_t	OPTION6_HDR_LEN = 4
	length of any DHCPv6 option header

Static Public Attributes inherited from isc::dhcp::DnrInstance
static const std::unordered_set< std::string >	ALPN_IDS
	Possible ALPN protocol IDs.

static const std::unordered_set< std::string >	FORBIDDEN_SVC_PARAMS = {"ipv4hint", "ipv6hint"}
	Set of forbidden SvcParams.

static const uint8_t	SERVICE_PRIORITY_SIZE = 2
	Size in octets of Service Priority field.

static const std::set< uint8_t >	SUPPORTED_SVC_PARAMS = {1, 3, 7}
	Ordered set of supported SvcParamKeys.

static const SvcParamsMap	SVC_PARAMS
	Service parameters, used in DNR options in DHCPv4 and DHCPv6, but also in RA and DNS.

Protected Member Functions inherited from isc::dhcp::Option
void	check () const
	A protected method used for option correctness.

template<typename OptionType >
OptionPtr	cloneInternal () const
	Copies this option and returns a pointer to the copy.

std::string	headerToText (const int indent=0, const std::string &type_name="") const
	Returns option header in the textual format.

void	packHeader (isc::util::OutputBuffer &buf, bool check=true) const
	Store option's header in a buffer.

void	packOptions (isc::util::OutputBuffer &buf, bool check=true) const
	Store sub options in a buffer.

std::string	suboptionsToText (const int indent=0) const
	Returns collection of suboptions in the textual format.

void	unpackOptions (const OptionBuffer &buf)
	Builds a collection of sub options from the buffer.

Protected Member Functions inherited from isc::dhcp::DnrInstance
uint16_t	dnrInstanceLen () const
	Calculates and returns length of DNR Instance data in octets.

Protected Attributes inherited from isc::dhcp::Option
OptionBuffer	data_
	contains content of this data

std::string	encapsulated_space_
	Name of the option space being encapsulated by this option.

OptionCollection	options_
	collection for storing suboptions

uint16_t	type_
	option type (0-255 for DHCPv4, 0-65535 for DHCPv6)

Universe	universe_
	option universe (V4 or V6)

Protected Attributes inherited from isc::dhcp::DnrInstance
uint16_t	addr_length_
	Length of included IP addresses in octets.

boost::shared_ptr< isc::dns::Name >	adn_
	Authentication domain name field of variable length.

uint16_t	adn_length_
	Length of the authentication-domain-name data in octets.

bool	adn_only_mode_
	Flag stating whether ADN only mode is used or not.

bool	alpn_http_
	Indicates whether the "alpn" SvcParam contains support for HTTP.

uint16_t	dnr_instance_data_length_
	Length of all following data inside this DNR instance in octets.

AddressContainer	ip_addresses_
	Vector container holding one or more IP addresses.

uint16_t	service_priority_
	The priority of this instance compared to other DNR instances.

OptionBuffer	svc_params_buf_
	Service Parameters (SvcParams) (variable length) as on-wire data buffer.

uint16_t	svc_params_length_
	Length of Service Parameters field in octets.

std::map< uint16_t, OpaqueDataTuple >	svc_params_map_
	Service Parameters stored in a map.

Option::Universe	universe_
	Either V4 or V6 Option universe.

Detailed Description

Represents DHCPv6 Encrypted DNS Option (code 144).

This option has been defined in the RFC9463 and it has a following structure:

option-code = 144 (2 octets)
option-len (2 octets)
Service Priority (2 octets)
ADN Length (2 octets)
Authentication Domain Name (variable length)
Addr Length (2 octets)
IPv6 Address(es) (variable length)
Service Parameters (variable length).

Definition at line 26 of file option6_dnr.h.

Constructor & Destructor Documentation

◆ Option6Dnr()

isc::dhcp::Option6Dnr::Option6Dnr	(	OptionBufferConstIter	begin,
		OptionBufferConstIter	end,
		bool	convenient_notation = `false`
	)

Constructor of the Option from on-wire data.

This constructor creates an instance of the option using a buffer with on-wire data. It may throw an exception if the unpack method throws.

Parameters

begin	Iterator pointing to the beginning of the buffer holding an option.
end	Iterator pointing to the end of the buffer holding an option.
convenient_notation	Flag stating whether data in buffer is a convenient notation string that needs custom parsing or binary data. Defaults to `false`.

Exceptions

OutOfRange	Thrown in case of truncated data.
BadValue	Thrown when `DnrInstance::unpackAdn(begin,end)` throws.
InvalidOptionDnrDomainName	Thrown when `DnrInstance::unpackAdn(begin,end)` throws.

Definition at line 18 of file option6_dnr.cc.

References unpack().

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Member Function Documentation

◆ clone()

OptionPtr isc::dhcp::Option6Dnr::clone ( ) const

overridevirtual

Copies this option and returns a pointer to the copy.

Returns: Pointer to the copy of the option.

Reimplemented from isc::dhcp::Option.

Definition at line 26 of file option6_dnr.cc.

◆ len()

uint16_t isc::dhcp::Option6Dnr::len ( ) const

overridevirtual

Returns length of the complete option (data length + DHCPv4/DHCPv6 option header)

Returns: length of the option

Reimplemented from isc::dhcp::Option.

Definition at line 103 of file option6_dnr.cc.

References isc::dhcp::DnrInstance::dnrInstanceLen(), and isc::dhcp::Option::OPTION6_HDR_LEN.

Referenced by toText().

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◆ pack()

void isc::dhcp::Option6Dnr::pack	(	util::OutputBuffer &	buf,
		bool	check = `false`
	)		const

overridevirtual

Writes option in wire-format to a buffer.

Writes option in wire-format to buffer, returns pointer to first unused byte after stored option (that is useful for writing options one after another).

Parameters

buf	pointer to a buffer
check	flag which indicates if checking the option length is required (used only in V4)

Exceptions

InvalidOptionDnrDomainName Thrown when Option's mandatory field ADN is empty.

Reimplemented from isc::dhcp::Option.

Definition at line 31 of file option6_dnr.cc.

References isc::dhcp::DnrInstance::addr_length_, isc::dhcp::DnrInstance::adn_length_, isc::dhcp::DnrInstance::adn_only_mode_, isc::dhcp::Option::check(), packAddresses(), isc::dhcp::DnrInstance::packAdn(), isc::dhcp::Option::packHeader(), isc::dhcp::DnrInstance::packSvcParams(), isc::dhcp::DnrInstance::service_priority_, and isc::util::OutputBuffer::writeUint16().

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◆ packAddresses()

void isc::dhcp::Option6Dnr::packAddresses ( isc::util::OutputBuffer & buf ) const

overridevirtual

Writes the IP address(es) in the wire format into a buffer.

The IP address(es) (ip_addresses_) data is appended at the end of the buffer.

Parameters

[out] buf buffer where IP address(es) will be written.

Exceptions

BadValue Thrown when trying to pack address which is not an IPv6 address

Reimplemented from isc::dhcp::DnrInstance.

Definition at line 47 of file option6_dnr.cc.

References isc::dhcp::DnrInstance::getLogPrefix(), isc::dhcp::DnrInstance::ip_addresses_, isc_throw, and isc::util::OutputBuffer::writeData().

Referenced by pack().

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◆ toText()

std::string isc::dhcp::Option6Dnr::toText ( int indent = 0 ) const

overridevirtual

Returns string representation of the option.

Parameters

indent number of spaces before printing text

Returns: string with text representation.

Reimplemented from isc::dhcp::Option.

Definition at line 94 of file option6_dnr.cc.

References isc::dhcp::DnrInstance::getDnrInstanceAsText(), isc::dhcp::Option::getHeaderLen(), len(), and isc::dhcp::Option::type_.

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◆ unpack()

void isc::dhcp::Option6Dnr::unpack	(	OptionBufferConstIter	begin,
		OptionBufferConstIter	end
	)

overridevirtual

Parses received wire data buffer.

Parameters

begin	iterator to first byte of option data
end	iterator to end of option data (first byte after option end)

Exceptions

OutOfRange	Thrown in case of truncated data.
BadValue	Thrown when `DnrInstance::unpackAdn(begin,end)` throws.
InvalidOptionDnrDomainName	Thrown when `DnrInstance::unpackAdn(begin,end)` throws.

Reimplemented from isc::dhcp::Option.

Definition at line 59 of file option6_dnr.cc.

References isc::dhcp::DnrInstance::adn_only_mode_, isc::dhcp::DnrInstance::getLogPrefix(), isc::dhcp::DnrInstance::getMinimalLength(), isc_throw, isc::dhcp::DnrInstance::parseDnrInstanceConfigData(), isc::dhcp::Option::setData(), unpackAddresses(), isc::dhcp::DnrInstance::unpackAdn(), isc::dhcp::DnrInstance::unpackServicePriority(), and isc::dhcp::DnrInstance::unpackSvcParams().

Referenced by Option6Dnr().

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◆ unpackAddresses()

void isc::dhcp::Option6Dnr::unpackAddresses	(	OptionBufferConstIter &	begin,
		OptionBufferConstIter	end
	)

overridevirtual

Unpacks IP address(es) from wire data and stores it/them in ip_addresses_.

It may throw in case of malformed data detected during parsing.

Parameters

begin	beginning of the buffer from which the field will be read
end	end of the buffer from which the field will be read

Exceptions

OutOfRange	Thrown in case of malformed data detected during parsing e.g. Addr Len not divisible by 16, Addr Len is 0, addresses data truncated etc.
BadValue	Thrown when trying to unpack address which is not an IPv6 address

Reimplemented from isc::dhcp::DnrInstance.

Definition at line 108 of file option6_dnr.cc.

References isc::dhcp::DnrInstance::addIpAddress(), isc::dhcp::DnrInstance::addr_length_, isc::asiolink::IOAddress::fromBytes(), isc::dhcp::DnrInstance::getAddrLengthSize(), isc::dhcp::DnrInstance::getLogPrefix(), isc_throw, isc::util::readUint16(), and isc::Exception::what().

Referenced by unpack().

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