Simulates a HTTP conversation based on tcp. More...

Public Member Functions
	TcpPacketGenerator (unsigned short port, function< void(GenericPacket)> send)
	Constructor. More...

bool	receivePacket (TcpPacket packet)
	Has to be called when a packet arrives. More...

void	sendConnect ()
	Sends a connect request (syn=1). More...

TcpPacket	nextPacket ()
	Returns a valid tcp packet. More...

unsigned int	status ()
	Returns the status code of the current connection state.

void	setSend (function< void(GenericPacket)> send)

Static Public Attributes
static const unsigned int	NO_CONNECTION = 0
	No connection established.

static const unsigned int	RECEIVED_SYN = 1
	Connection request received by peer.

static const unsigned int	ESTABLISHED = 2
	Handshake successful and connection established.

Private Member Functions
void	send (TcpPacket packet)

void	sendConnectResponse ()
	Acknowledges a connect request (syn=1, ack=1)

void	sendAcknowledgeResponse ()
	Responses to a connect request acknowledgement (ack=1)

TcpPacket	createPacket (bool syn, bool ack, std::string data)
	Creates a tcp packet with flags and data. More...

Private Attributes
unsigned short	m_port
	source/destination port used for communication

unsigned long	m_next_sequence
	sequence number used for sending of the next packet

unsigned long	m_base_sequence
	highest sequence number that was acknowledge by the receiver

unsigned long	m_next_peer_sequence
	next expected sequence number by peer

function< void(GenericPacket)>	m_send
	pointer to a function that is used for sending packets over the network

unsigned int	m_state
	stores the internal connection state code (see constants)

unsigned int	m_timeout
	timeout in milliseconds used for resending of packets (not used yet)

bool	m_server
	true if you are the server after a successful handshake

Detailed Description

Simulates a HTTP conversation based on tcp.

Creates valid tcp packets by increasing the sequence number and acknowledging incoming packets. Packet resending or re-ordering of incoming packets is not implemented.

Initiate a handshake by calling 'sendConnect'. If a connect request is received, a handshake is initiated as well.

Constructor & Destructor Documentation

whisper_library::TcpPacketGenerator::TcpPacketGenerator	(	unsigned short	port,
		function< void(GenericPacket)>	send
	)

Constructor.

Sends a connect request to peer.

Parameters

port	Source and destination port used for creating the packets
send	Pointer to a function to send packets over the network

Member Function Documentation

TcpPacket whisper_library::TcpPacketGenerator::createPacket	(	bool	syn,
		bool	ack,
		std::string	data
	)

private

Creates a tcp packet with flags and data.

Parameters

syn	Sets the synchronisation flag if true
ack	Sets the acknowledgement flag and number if true
data	data of the returned packet

Returns: valid tcp packet

TcpPacket whisper_library::TcpPacketGenerator::nextPacket ( )

Returns a valid tcp packet.

Creates a tcp data packet using m_next_sequence. The content is a http get request if you are sender or an http 404 response if you are server.

Returns: valid tcp data packet

bool whisper_library::TcpPacketGenerator::receivePacket ( TcpPacket packet )

Has to be called when a packet arrives.

Interprets an incoming packet. Responds to connect requests and connect acknowledges. Data packets are forwarded to a covert channel using m_forward, afterwards an acknowledge is send.

Parameters

packet Tcp packet that was received

void whisper_library::TcpPacketGenerator::sendConnect ( )

Sends a connect request (syn=1).

Use this at the start of a conversation to initiate a handshake

Public Member Functions

Static Public Attributes

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation