Sniffer Class Reference

The Sniffer class is the one that use the pcap library to extract the packet information. It discards any packet that is not Ethernet->IP->(TCP|UDP), and pass up to the GUI the packets that are Ethernet->IP->(TCP|UDP). More...

#include <sniffer.h>

Inheritance diagram for Sniffer:

Public Slots
void	process ()
	The sniffer is run as a separate thread and the function process is the main function of the thread. It is the sniffer.

Signals
void	resultReady (unsigned long index)

Public Member Functions
	Sniffer ()
	Constructor, does nothing.
	Sniffer (QWaitCondition *pw, QMutex *mx, int *ps)
	Sets the mutexes for the inter communication between the sniffer and the GUI. More...
	~Sniffer ()
	Destructor, does nothing.
vector< ip_packet > *	getPacketList ()
	Returns the packet list that contains the packets that are Ethernet -> IP -> (TCP|UDP) More...
string	format_payload (const char *payload, int len)
	Formats the payload from a byte stream into a string of ascci. More...
string	format_hex_ascii_line (const char *payload, int len, int offset)
	Return string with the bytes of a payload line in ascii. More...
void	find_devices (vector< string > &)
	Find the network devices in the computer, and store them in vector devs. More...
void	setDevice (string)
	Sets the device to capture packets to dev. More...

Private Member Functions
void	print_payload (const u_char *payload, int len)
	Prints the payload in ascii. More...
void	print_hex_ascii_line (const u_char *payload, int len, int offset)
	Prints to std output the a payload in ascii. More...
void	got_packet (const struct pcap_pkthdr *header, const u_char *packet)
	Disects the received packet. Takes out the info needed. More...

Private Attributes
vector< ip_packet >	packet_list
QWaitCondition *	wait_pause
QMutex *	mutex
string	device
string	filter
int *	pause

Detailed Description

The Sniffer class is the one that use the pcap library to extract the packet information. It discards any packet that is not Ethernet->IP->(TCP|UDP), and pass up to the GUI the packets that are Ethernet->IP->(TCP|UDP).

Constructor & Destructor Documentation

Sniffer::Sniffer	(	QWaitCondition *	pw,
		QMutex *	mx,
		int *	ps
	)

Sets the mutexes for the inter communication between the sniffer and the GUI.

Parameters

pw	used to pause the capture of packets
mx	used to protect critical region
ps	flag to pause the packet capture

Member Function Documentation

void Sniffer::find_devices

(

vector< string > &

devs

)

Find the network devices in the computer, and store them in vector devs.

Parameters

devs	vector of string for device names

string Sniffer::format_hex_ascii_line	(	const char *	payload,
		int	len,
		int	offset
	)

Return string with the bytes of a payload line in ascii.

Parameters

payload	payload of the packet
len	length of the packet
offset	offset of packet

Returns

a string with the bytes of a payload line in ascii

string Sniffer::format_payload	(	const char *	payload,
		int	len
	)

Formats the payload from a byte stream into a string of ascci.

Parameters

payload	payload of the packet
len	length of the packet

Returns

the payload in a string of ascii

vector< ip_packet > * Sniffer::getPacketList

(

)

Returns the packet list that contains the packets that are Ethernet -> IP -> (TCP|UDP)

Returns

vector of packets

void Sniffer::got_packet ( const struct pcap_pkthdr *  header, const u_char *  packet  )

private

Disects the received packet. Takes out the info needed.

Parameters

pcap_pkthdr	header of the pcap packet
packet	recieved packet

void Sniffer::print_hex_ascii_line ( const u_char *  payload, int  len, int  offset  )

private

Prints to std output the a payload in ascii.

Parameters

payload	payload of the packet
len	length of the packet
offset	offset

void Sniffer::print_payload ( const u_char *  payload, int  len  )

private

Prints the payload in ascii.

Parameters

payload	payload of the packet
len	payload length

void Sniffer::setDevice

(

string

dev

)

Sets the device to capture packets to dev.

Parameters

dev	name of the device

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The documentation for this class was generated from the following files:

• sniffer.h
• sniffer.cpp