Represents an Ipv4 header. More...

Public Member Functions
	IpHeaderv4 ()
	Constructor that initializes all fields with 0.

	IpHeaderv4 (vector< bool > frame)
	Constructor that extracts the Ipv4 header from a network frame. More...

	~IpHeaderv4 ()
	Destructor.

void	calculateHeaderLength ()
	Calculates the length of the header and sets the corresponding field. More...

void	calculateChecksum ()
	Calculates the checksum and sets the corresponding field.

void	print ()
	Prints the content of the ip header as hexadecimal.

string	info ()
	Creates a string which lists all fields and values in humanly readable form. More...

vector< bool >	toVector ()

unsigned int	version ()
	Returns the IP-Version (4 or 6) (4 bit)

unsigned int	ipHeaderLength ()
	Returns the length of the IP header : length * 32 bit (4 bit)

unsigned int	typeOfService ()
	Returns the type of service, which is used for packet prioritization (8 bit)

unsigned int	totalLength ()
	Returns the total length of the packet in byte(maximum 65536 Byte = 64 KiB) (16 bit)

unsigned int	identification ()
	Returns the unique identifier to reassemble fragmented IP-Datagrams (16 bit)

bool	flagReserved ()
	Returns the reserved flag, has to be 0 (1 bit)

bool	flagDontFragment ()
	Returns the 'don't fragment' bit.

bool	flagFragmented ()
	Returns a flag that indicates, wether there are more fragments coming or not (0 if only or last fragment) (1 bit)

unsigned int	offset ()
	Returns the fragment position (0 if not fragmented) (12 bit)

unsigned int	timeToLive ()
	Returns the time to live, drop packet if 0, reduce at each hop (4 bit)

unsigned int	protocol ()
	Returns the application layer protocol id (4 bit)

unsigned int	checksum ()
	Returns the Ip header checksum (16 bit)

unsigned long	sourceIp ()
	Returns the Ip address of the sender (32 bit)

string	sourceIpDotted ()
	Returns the ip address of the sender in dotted form.

unsigned long	destinationIp ()
	Returns the Ip address of the receiver(32 bit)

string	destinationIpDotted ()
	Returns the Ip address of the receiver in dotted form.

void	setVersion (unsigned int version)
	Sets the IP-Version (4 or 6) (4 bit)

void	setTypeOfService (unsigned int tos)
	Sets the type of service, which is used for packet prioritization (8 bit)

void	setTotalLength (unsigned int total_length)
	Sets the total length of the packet in byte (maximum 65536 Byte = 64 KiB) (16 bit)

void	setIdentification (unsigned int identification)
	Sets the unique identifier to reassemble fragmented IP-Datagrams (16 bit)

void	setFlagReserved (bool flag)
	Sets the reserved flag, has to be 0 (1 bit)

void	setFlagdontFragment (bool flag)
	Sets the 'don't fragment' bit.

void	setFlagFragmented (bool flag)
	Sets a flag that indicates, wether there are more fragments coming or not (0 if only or last fragment) (1 bit)

void	setOffset (unsigned int offset)
	Sets the fragment position (0 if not fragmented) (12 bit)

void	setTimeToLive (unsigned int ttl)
	Sets the time to live, drop packet if 0, reduce at each hop (4 bit)

void	setProtocol (unsigned int protocol_id)
	Sets the application layer protocol id (4 bit)

void	setSourceIp (unsigned long source_ip)
	Sets the Ip address of the sender (32 bit)

void	setSourceIp (string source_ip)
	Sets the ip address of the sender in dotted form.

void	setDestinationIp (unsigned long destination_ip)
	Sets the Ip address of the receiver(32 bit)

void	setDestinationIp (string destination_ip)
	Sets the Ip address of the receiver in dotted form.

Static Public Attributes
static const unsigned int	TCP = 6
	Protocol id of tcp.

static const unsigned int	UDP = 17
	Protocol id of udp.

Private Member Functions
string	ipToDotted (unsigned long ip)
	Converts an ip to its dotted form. More...

unsigned long	ipToUlong (string ip)
	Converts an ip to decimal. More...

Private Attributes
unsigned char *	m_head
	Holds the 20 byte ip header.

Detailed Description

Represents an Ipv4 header.

This class provides getters and setters for all Ipv4 header fields, except the options-field. The content is exported as binary by using 'toVector'.

Constructor & Destructor Documentation

whisper_library::IpHeaderv4::IpHeaderv4 ( vector< bool > frame )

Constructor that extracts the Ipv4 header from a network frame.

Parameters

frame binary network frame in little endian

Member Function Documentation

void whisper_library::IpHeaderv4::calculateHeaderLength ( )

Calculates the length of the header and sets the corresponding field.

Since the options field is not supported yet, the default value '5' is set (5x32bit)

string whisper_library::IpHeaderv4::info ( )

Creates a string which lists all fields and values in humanly readable form.

Returns: String with all field values

string whisper_library::IpHeaderv4::ipToDotted ( unsigned long ip )

private

Converts an ip to its dotted form.

Parameters

ip	ip as decimal

Returns: ip in dotted form

unsigned long whisper_library::IpHeaderv4::ipToUlong ( string ip )

private

Converts an ip to decimal.

Parameters

ip	ip in dotted form

Returns: ip as decimal

vector< bool > whisper_library::IpHeaderv4::toVector ( )

Converts the ip header to binary /return binary representation of the ip header in little endian

Public Member Functions

Static Public Attributes

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation