Packet snooping

View the data of packets being send and received over a network interface. More...

Functions
int	snoopCapture (struct snoop *cap, struct packet *pkt)
int	snoopClose (struct snoop *cap)
bool	snoopFilter (struct snoop *s, struct packet *pkt)
int	snoopOpen (struct snoop *cap, char *devname)
int	snoopPrint (struct packet *pkt, char dump, char verbose)
int	snoopPrintArp (struct arpPkt *arp, char verbose)
int	snoopPrintEthernet (struct etherPkt *ether, char verbose)
int	snoopPrintIpv4 (struct ipv4Pkt *ip, char verbose)
int	snoopPrintTcp (struct tcpPkt *tcp, char verbose)
int	snoopPrintUdp (struct udpPkt *udp, char verbose)
struct packet *	snoopRead (struct snoop *cap)

Detailed Description

View the data of packets being send and received over a network interface.

Function Documentation

int snoopCapture	(	struct snoop *	cap,
		struct packet *	pkt
	)

Captures a network packet from a network interface.

Returns

OK if capture was successful, otherwise SYSERR

int snoopClose

(

struct snoop *

cap

)

Closes a capture from a network device or file.

Parameters

cap	pointer to capture structure

Returns

OK if close was successful, otherwise SYSERR

bool snoopFilter	(	struct snoop *	s,
		struct packet *	pkt
	)

Determine if a packet matches the filter.

Returns

TRUE if packet matches filter, otherwise FALSE

int snoopOpen	(	struct snoop *	cap,
		char *	devname
	)

Opens a capture from a network device.

Parameters

cap	pointer to capture structure
name	of underlying device, ALL for all network devices

Returns

OK if open was successful, otherwise SYSERR

Precondition

-condition filter settings should already be setup in cap

int snoopPrint	(	struct packet *	pkt,
		char	dump,
		char	verbose
	)

Outputs snoop information for a packet.

Parameters

pkt	packet
dump	dump level
verbose	verbosity level

Returns

OK, SYSERR if error occurs

int snoopPrintArp	(	struct arpPkt *	arp,
		char	verbose
	)

Print contents of ARP packet

Parameters

arp	ARP packet

Returns

OK if print successful, SYSERR if error occurs

int snoopPrintEthernet	(	struct etherPkt *	ether,
		char	verbose
	)

Print contents of Ethernet packet

Parameters

ether

Ethernet packet

Returns

OK if print successful, SYSERR if error occurs

int snoopPrintIpv4	(	struct ipv4Pkt *	ip,
		char	verbose
	)

Print contents of an IPv4 packet

Parameters

ip	IPv4 packet

Returns

OK if print successful, SYSERR if error occurs

int snoopPrintTcp	(	struct tcpPkt *	tcp,
		char	verbose
	)

Print contents of an TCP packet

Parameters

tcp	TCP packet

Returns

OK if print successful, SYSERR if error occurs

int snoopPrintUdp	(	struct udpPkt *	udp,
		char	verbose
	)

Print contents of an UDP packet

Parameters

pkt	the packet

Returns

OK if print successful, SYSERR if error occurs

struct packet* snoopRead

(

struct snoop *

cap

)

Returns a packet captured from a network interface.

Returns

a packet if read was successful, otherwise SYSERR