#include <TcpLayer.h>

Inheritance diagram for pcpp::TcpLayer:

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

	TcpLayer ()

	TcpLayer (uint16_t portSrc, uint16_t portDst)

	TcpLayer (const TcpLayer &other)

TcpLayer &	operator= (const TcpLayer &other)

tcphdr *	getTcpHeader ()

TcpOption	getTcpOption (TcpOptionType option)

TcpOption	getFirstTcpOption ()

TcpOption	getNextTcpOption (TcpOption &tcpOption)

size_t	getTcpOptionCount ()

TcpOption	addTcpOption (const TcpOptionBuilder &optionBuilder)

TcpOption	addTcpOptionAfter (const TcpOptionBuilder &optionBuilder, TcpOptionType prevOptionType=TCPOPT_Unknown)

bool	removeTcpOption (TcpOptionType optionType)

bool	removeAllTcpOptions ()

uint16_t	calculateChecksum (bool writeResultToPacket)

void	parseNextLayer ()

size_t	getHeaderLen ()

void	computeCalculateFields ()

std::string	toString ()

OsiModelLayer	getOsiModelLayer ()

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

Layer *	getNextLayer ()

Layer *	getPrevLayer ()

ProtocolType	getProtocol ()

uint8_t *	getData ()

size_t	getDataLen ()

uint8_t *	getLayerPayload ()

size_t	getLayerPayloadSize ()

bool	isAllocatedToPacket ()

void	copyData (uint8_t *toArr)

uint8_t *	getDataPtr (size_t offset=0)

Detailed Description

Represents a TCP (Transmission Control Protocol) protocol layer

Constructor & Destructor Documentation

◆ TcpLayer() [1/4]

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

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

Parameters

[in]	data	A pointer to the raw data (will be casted to tcphdr)
[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

◆ TcpLayer() [2/4]

pcpp::TcpLayer::TcpLayer ( )

A constructor that allocates a new TCP header with zero TCP options

◆ TcpLayer() [3/4]

pcpp::TcpLayer::TcpLayer	(	uint16_t	portSrc,
		uint16_t	portDst
	)

A constructor that allocates a new TCP header with source port and destination port and zero TCP options

Parameters

[in]	portSrc	Source port
[in]	portDst	Destination port

◆ TcpLayer() [4/4]

pcpp::TcpLayer::TcpLayer ( const TcpLayer & other )

A copy constructor that copy the entire header from the other TcpLayer (including TCP options)

Member Function Documentation

◆ addTcpOption()

TcpOption pcpp::TcpLayer::addTcpOption ( const TcpOptionBuilder & optionBuilder )

Add a new TCP option at the end of the layer (after the last TCP option)

Parameters

[in] optionBuilder A TcpOptionBuilder object that contains the TCP option data to be added

Returns: A TcpOption object that contains the newly added TCP option data or logical NULL (TcpOption::isNull() == true) if addition failed. In case of a failure a corresponding error message will be printed to log

◆ addTcpOptionAfter()

TcpOption pcpp::TcpLayer::addTcpOptionAfter	(	const TcpOptionBuilder &	optionBuilder,
		TcpOptionType	prevOptionType = `TCPOPT_Unknown`
	)

Add a new TCP option after an existing one

Parameters

[in]	optionBuilder	A TcpOptionBuilder object that contains the requested TCP option data to be added
[in]	prevOptionType	The TCP option which the newly added option should come after. This is an optional parameter which gets a default value of TCPOPT_Unknown if omitted, which means the new option will be added as the first option in the layer

Returns: A TcpOption object containing the newly added TCP option data or logical NULL (TcpOption::isNull() == true) if addition failed. In case of a failure a corresponding error message will be printed to log

◆ calculateChecksum()

uint16_t pcpp::TcpLayer::calculateChecksum ( bool writeResultToPacket )

Calculate the checksum from header and data and possibly write the result to tcphdr::headerChecksum

Parameters

[in] writeResultToPacket If set to true then checksum result will be written to tcphdr::headerChecksum

Returns: The checksum result

◆ computeCalculateFields()

void pcpp::TcpLayer::computeCalculateFields ( )

virtual

Calculate tcphdr::headerChecksum field

Implements pcpp::Layer.

◆ getFirstTcpOption()

TcpOption pcpp::TcpLayer::getFirstTcpOption ( )

Returns: The first TCP option in the packet. If the current layer contains no options the returned value will contain a logical NULL (TcpOption::isNull() == true)

◆ getHeaderLen()

size_t pcpp::TcpLayer::getHeaderLen ( )

inlinevirtual

Returns: Size of tcphdr + all TCP options

Implements pcpp::Layer.

◆ getNextTcpOption()

TcpOption pcpp::TcpLayer::getNextTcpOption ( TcpOption & tcpOption )

Get the TCP option that comes after a given option. If the given option was the last one, the returned value will contain a logical NULL (TcpOption::isNull() == true)

Parameters

[in] tcpOption A TCP option object that exists in the current layer

Returns: A TcpOption object that contains the TCP option data that comes next, or logical NULL if the given TCP option: (1) was the last one; or (2) contains a logical NULL; or (3) doesn't belong to this packet

◆ getOsiModelLayer()

OsiModelLayer pcpp::TcpLayer::getOsiModelLayer ( )

inlinevirtual

Returns: The OSI Model layer this protocol belongs to

Implements pcpp::Layer.

◆ getTcpHeader()

tcphdr* pcpp::TcpLayer::getTcpHeader ( )

inline

Get a pointer to the TCP header. Notice this points directly to the data, so every change will change the actual packet data

Returns: A pointer to the tcphdr

◆ getTcpOption()

TcpOption pcpp::TcpLayer::getTcpOption ( TcpOptionType option )

Get a TCP option by type

Parameters

[in] option TCP option type to retrieve

Returns: An TcpOption object that contains the first option that matches this type, or logical NULL (TcpOption::isNull() == true) if no such option found

◆ getTcpOptionCount()

size_t pcpp::TcpLayer::getTcpOptionCount ( )

Returns: The number of TCP options in this layer

◆ operator=()

TcpLayer& pcpp::TcpLayer::operator= ( const TcpLayer & other )

An assignment operator that first delete all data from current layer and then copy the entire header from the other TcpLayer (including TCP options)

◆ parseNextLayer()

void pcpp::TcpLayer::parseNextLayer ( )

virtual

Currently identifies the following next layers: HttpRequestLayer, HttpResponseLayer. Otherwise sets PayloadLayer

Implements pcpp::Layer.

◆ removeAllTcpOptions()

bool pcpp::TcpLayer::removeAllTcpOptions ( )

Remove all TCP options in this layer

Returns: True if all TCP options were successfully removed or false if removal failed for some reason (a proper error will be written to log)

◆ removeTcpOption()

bool pcpp::TcpLayer::removeTcpOption ( TcpOptionType optionType )

Remove an existing TCP option from the layer. TCP option is found by type

Parameters

[in] optionType The TCP option type to remove

Returns: True if TCP option was removed or false if type wasn't found or if removal failed (in each case a proper error will be written to log)

◆ toString()

std::string pcpp::TcpLayer::toString ( )

virtual

Returns: A string representation of the layer most important data (should look like the layer description in Wireshark)

Implements pcpp::Layer.

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ TcpLayer() [1/4]

◆ TcpLayer() [2/4]

◆ TcpLayer() [3/4]

◆ TcpLayer() [4/4]

Member Function Documentation

◆ addTcpOption()

◆ addTcpOptionAfter()

◆ calculateChecksum()

◆ computeCalculateFields()

◆ getFirstTcpOption()

◆ getHeaderLen()

◆ getNextTcpOption()

◆ getOsiModelLayer()

◆ getTcpHeader()

◆ getTcpOption()

◆ getTcpOptionCount()

◆ operator=()

◆ parseNextLayer()

◆ removeAllTcpOptions()

◆ removeTcpOption()

◆ toString()