#include <DnsLayer.h>

Inheritance diagram for pcpp::DnsOverTcpLayer:

Public Member Functions
	DnsOverTcpLayer (uint8_t data, size_t dataLen, Layer prevLayer, Packet *packet)

	DnsOverTcpLayer ()

	DnsOverTcpLayer (const DnsOverTcpLayer &other)

uint16_t	getTcpMessageLength ()

void	setTcpMessageLength (uint16_t value)

void	computeCalculateFields () override
	Calculate the TCP message length field.

Public Member Functions inherited from pcpp::DnsLayer
	DnsLayer (uint8_t data, size_t dataLen, Layer prevLayer, Packet *packet)

	DnsLayer ()

	DnsLayer (const DnsLayer &other)

DnsLayer &	operator= (const DnsLayer &other)

dnshdr *	getDnsHeader () const

DnsQuery *	getQuery (const std::string &name, bool exactMatch) const

DnsQuery *	getFirstQuery () const

DnsQuery *	getNextQuery (DnsQuery *query) const

size_t	getQueryCount () const

DnsQuery *	addQuery (const std::string &name, DnsType dnsType, DnsClass dnsClass)

DnsQuery *	addQuery (DnsQuery *const copyQuery)

bool	removeQuery (const std::string &queryNameToRemove, bool exactMatch)

bool	removeQuery (DnsQuery *queryToRemove)

DnsResource *	getAnswer (const std::string &name, bool exactMatch) const

DnsResource *	getFirstAnswer () const

DnsResource *	getNextAnswer (DnsResource *answer) const

size_t	getAnswerCount () const

DnsResource *	addAnswer (const std::string &name, DnsType dnsType, DnsClass dnsClass, uint32_t ttl, IDnsResourceData *data)

DnsResource *	addAnswer (DnsResource *const copyAnswer)

bool	removeAnswer (const std::string &answerNameToRemove, bool exactMatch)

bool	removeAnswer (DnsResource *answerToRemove)

DnsResource *	getAuthority (const std::string &name, bool exactMatch) const

DnsResource *	getFirstAuthority () const

DnsResource *	getNextAuthority (DnsResource *authority) const

size_t	getAuthorityCount () const

DnsResource *	addAuthority (const std::string &name, DnsType dnsType, DnsClass dnsClass, uint32_t ttl, IDnsResourceData *data)

DnsResource *	addAuthority (DnsResource *const copyAuthority)

bool	removeAuthority (const std::string &authorityNameToRemove, bool exactMatch)

bool	removeAuthority (DnsResource *authorityToRemove)

DnsResource *	getAdditionalRecord (const std::string &name, bool exactMatch) const

DnsResource *	getFirstAdditionalRecord () const

DnsResource *	getNextAdditionalRecord (DnsResource *additionalRecord) const

size_t	getAdditionalRecordCount () const

DnsResource *	addAdditionalRecord (const std::string &name, DnsType dnsType, DnsClass dnsClass, uint32_t ttl, IDnsResourceData *data)

DnsResource *	addAdditionalRecord (const std::string &name, DnsType dnsType, uint16_t customData1, uint32_t customData2, IDnsResourceData *data)

DnsResource *	addAdditionalRecord (DnsResource *const copyAdditionalRecord)

bool	removeAdditionalRecord (const std::string &additionalRecordNameToRemove, bool exactMatch)

bool	removeAdditionalRecord (DnsResource *additionalRecordToRemove)

void	parseNextLayer () override
	Does nothing for this layer (DnsLayer is always last)

size_t	getHeaderLen () const override

std::string	toString () const override

OsiModelLayer	getOsiModelLayer () const override

Public Member Functions inherited from pcpp::Layer
	~Layer () override

Layer *	getNextLayer () const

Layer *	getPrevLayer () const

ProtocolType	getProtocol () const

bool	isMemberOfProtocolFamily (ProtocolTypeFamily protocolTypeFamily) const

uint8_t *	getData () const

size_t	getDataLen () const

uint8_t *	getLayerPayload () const

size_t	getLayerPayloadSize () const

bool	isAllocatedToPacket () const

void	copyData (uint8_t *toArr) const

uint8_t *	getDataPtr (size_t offset=0) const override

Additional Inherited Members
Static Public Member Functions inherited from pcpp::DnsLayer
static bool	isDnsPort (uint16_t port)

static bool	isDataValid (const uint8_t *data, size_t dataLen, bool dnsOverTcp=false)

Protected Member Functions inherited from pcpp::Layer
template<typename T , typename... Args>
Layer *	constructNextLayer (uint8_t data, size_t dataLen, Packet packet, Args &&... extraArgs)

template<typename T , typename TFallback , typename... Args>
Layer *	tryConstructNextLayerWithFallback (uint8_t data, size_t dataLen, Packet packet, Args &&... extraArgs)

Static Protected Member Functions inherited from pcpp::Layer
template<typename T >
static bool	canReinterpretAs (const uint8_t *data, size_t dataLen)
	Check if the data is large enough to reinterpret as a type. More...

Detailed Description

Note: DNS over TCP can spread over more than one packet, but this implementation doesn't support this use-case and assumes the whole message fits in a single packet.

Represents the DNS over TCP layer. DNS over TCP is described here: https://tools.ietf.org/html/rfc7766 . It is very similar to DNS over UDP, except for one field: TCP message length which is added in the beginning of the message before the other DNS data properties. The rest of the data is similar.

Constructor & Destructor Documentation

◆ DnsOverTcpLayer() [1/3]

pcpp::DnsOverTcpLayer::DnsOverTcpLayer	(	uint8_t *	data,
		size_t	dataLen,
		Layer *	prevLayer,
		Packet *	packet
	)

inline

A constructor that creates the layer from an existing packet raw data

Parameters

[in]	data	A pointer to the raw data
[in]	dataLen	Size of the data in bytes
[in]	prevLayer	A pointer to the previous layer
[in]	packet	A pointer to the Packet instance where layer will be stored in

◆ DnsOverTcpLayer() [2/3]

pcpp::DnsOverTcpLayer::DnsOverTcpLayer ( )

inline

A constructor that creates an empty DNS layer: all members of dnshdr are set to 0 and layer will contain no records

◆ DnsOverTcpLayer() [3/3]

pcpp::DnsOverTcpLayer::DnsOverTcpLayer ( const DnsOverTcpLayer & other )

inline

A copy constructor for this layer

Parameters

[in] other The DNS over TCP layer to copy from

Member Function Documentation

◆ getTcpMessageLength()

uint16_t pcpp::DnsOverTcpLayer::getTcpMessageLength ( )

Returns: The value of the TCP message length as described in https://tools.ietf.org/html/rfc7766#section-8

◆ setTcpMessageLength()

void pcpp::DnsOverTcpLayer::setTcpMessageLength ( uint16_t value )

Set the TCP message length value as described in https://tools.ietf.org/html/rfc7766#section-8

Parameters

[in] value The value to set

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ DnsOverTcpLayer() [1/3]

◆ DnsOverTcpLayer() [2/3]

◆ DnsOverTcpLayer() [3/3]

Member Function Documentation

◆ getTcpMessageLength()

◆ setTcpMessageLength()