pcap.c File Reference

#include <pcap-stdinc.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "pcap-int.h"

Go to the source code of this file.

Data Structures

struct singleton

struct pkt_for_fakecallback

struct dlt_choice

Defines

#define DLT_CHOICE(code, description) { #code, description, code }

#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }

Functions

int pcap_dispatch (pcap_t *p, int cnt, pcap_handler callback, u_char *user)

It collects a group of packets.

int pcap_read (pcap_t *p, int cnt, pcap_handler callback, u_char *user)

int pcap_loop (pcap_t *p, int cnt, pcap_handler callback, u_char *user)

It collects a group of packets.

void pcap_oneshot (u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt)

const u_char * pcap_next (pcap_t *p, struct pcap_pkthdr *h)

It returns the next available packet.

void pcap_fakecallback (u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt)

int pcap_next_ex (pcap_t *p, struct pcap_pkthdr **pkt_header, const u_char **pkt_data)

Read a packet from an interface or from an offline capture.

void pcap_breakloop (pcap_t *p)

int pcap_datalink (pcap_t *p)

Returns the link layer of an adapter.

int pcap_list_datalinks (pcap_t *p, int **dlt_buffer)

int pcap_set_datalink (pcap_t *p, int dlt)

int pcap_strcasecmp (const char *s1, const char *s2)

int pcap_datalink_name_to_val (const char *name)

const char * pcap_datalink_val_to_name (int dlt)

const char * pcap_datalink_val_to_description (int dlt)

int pcap_snapshot (pcap_t *p)

Returns the dimension of the packet portion (in bytes) that is delivered to the application.

int pcap_is_swapped (pcap_t *p)

returns true if the current savefile uses a different byte order than the current system.

int pcap_major_version (pcap_t *p)

returns the major version number of the pcap library used to write the savefile.

int pcap_minor_version (pcap_t *p)

returns the minor version number of the pcap library used to write the savefile.

FILE * pcap_file (pcap_t *p)

It returns the stdio stream of an offile capture.

int pcap_fileno (pcap_t *p)

It returns the file descriptor of a capture device.

void pcap_perror (pcap_t *p, char *prefix)

prints the text of the last pcap library error on stderr, prefixed by prefix.

char * pcap_geterr (pcap_t *p)

returns the error text pertaining to the last pcap library error.

int pcap_getnonblock (pcap_t *p, char *errbuf)

Gets the "non-blocking" state of an interface.

int pcap_setnonblock (pcap_t *p, int nonblock, char *errbuf)

Switches between blocking and nonblocking mode.

char * pcap_win32strerror (void)

char * pcap_strerror (int errnum)

pcap_strerror() is provided in case strerror() isn't available.

int pcap_setfilter (pcap_t *p, struct bpf_program *fp)

Associates a filter to a capture.

int pcap_stats (pcap_t *p, struct pcap_stat *ps)

It returns statistics on current capture.

int pcap_stats_dead (pcap_t *p, struct pcap_stat *ps)

void pcap_close_dead (pcap_t *p)

pcap_t * pcap_open_dead (int linktype, int snaplen)

It creates a pcap_t structure without starting a capture.

void pcap_close (pcap_t *p)

closes the files associated with p and deallocates resources.

const char * pcap_lib_version (void)

Variables

const char rcsid[] _U_

dlt_choice dlt_choices []

const u_char charmap []

const char wpcap_version_string [] = "3.1 beta4"

const char pcap_version_string_fmt []

const char pcap_version_string_packet_dll_fmt []

char * pcap_version_string

Define Documentation

#define DLT_CHOICE ( code,
description ) { #code, description, code }

Definition at line 337 of file pcap.c.

#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }

Definition at line 338 of file pcap.c.

Function Documentation

void pcap_breakloop ( pcap_t * p )

Definition at line 243 of file pcap.c.

void pcap_close_dead ( pcap_t * p ) [static]

Definition at line 704 of file pcap.c.
Referenced by pcap_open_dead().

int pcap_datalink_name_to_val ( const char * name )

Definition at line 460 of file pcap.c.
References dlt_choice::dlt, dlt_choices, dlt_choice::name, and pcap_strcasecmp().

const char* pcap_datalink_val_to_description ( int dlt )

Definition at line 485 of file pcap.c.
References dlt_choice::description, dlt_choice::dlt, dlt_choices, and dlt_choice::name.

const char* pcap_datalink_val_to_name ( int dlt )

Definition at line 473 of file pcap.c.
References dlt_choice::dlt, dlt_choices, and dlt_choice::name.
Referenced by pcap_set_datalink().

void pcap_fakecallback ( u_char * userData,

const struct pcap_pkthdr * h,

const u_char * pkt

) [static]

Definition at line 165 of file pcap.c.
Referenced by pcap_next_ex().

const char* pcap_lib_version ( void )

Definition at line 761 of file pcap.c.
References PacketGetVersion(), pcap_version_string, pcap_version_string_fmt, pcap_version_string_packet_dll_fmt, and wpcap_version_string.

int pcap_list_datalinks ( pcap_t * p,

int ** dlt_buffer

)

Definition at line 255 of file pcap.c.
References pcap_strerror(), and snprintf.

void pcap_oneshot ( u_char * userData,

const struct pcap_pkthdr * h,

const u_char * pkt

) [static]

Definition at line 141 of file pcap.c.
Referenced by pcap_next().

int pcap_read ( pcap_t * p,

int cnt,

pcap_handler callback,

u_char * user

)

Definition at line 84 of file pcap.c.

int pcap_set_datalink ( pcap_t * p,

int dlt

)

Definition at line 286 of file pcap.c.
References pcap_datalink_val_to_name(), and snprintf.

int pcap_stats_dead ( pcap_t * p,

struct pcap_stat * ps

) [static]

Definition at line 696 of file pcap.c.
References PCAP_ERRBUF_SIZE, and snprintf.
Referenced by pcap_open_dead().

int pcap_strcasecmp ( const char * s1,

const char * s2

)

Definition at line 447 of file pcap.c.
References charmap.
Referenced by pcap_datalink_name_to_val().

char* pcap_win32strerror ( void )

Definition at line 640 of file pcap.c.
References PCAP_ERRBUF_SIZE.
Referenced by pcap_lookupdev(), pcap_open_live(), pcap_setfilter_win32(), pcap_setnonblock_win32(), pcap_stats_ex(), and pcap_stats_win32().

Variable Documentation

const char rcsid [] _U_ [static]

Initial value:
"@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.63.2.9 2004/03/25 22:40:52 guy Exp $ (LBL)"

Definition at line 35 of file pcap.c.

const u_char charmap[] [static]

Definition at line 379 of file pcap.c.
Referenced by pcap_strcasecmp().

struct dlt_choice dlt_choices[] [static]

Definition at line 340 of file pcap.c.
Referenced by pcap_datalink_name_to_val(), pcap_datalink_val_to_description(), and pcap_datalink_val_to_name().

char* pcap_version_string [static]

Definition at line 758 of file pcap.c.
Referenced by pcap_lib_version().

const char pcap_version_string_fmt[] [static]

Initial value:
"WinPcap version %s, based on libpcap version 0.8.3"

Definition at line 754 of file pcap.c.
Referenced by pcap_lib_version().

const char pcap_version_string_packet_dll_fmt[] [static]

Initial value:
"WinPcap version %s (packet.dll version %s), based on libpcap version 0.8.3"

Definition at line 756 of file pcap.c.
Referenced by pcap_lib_version().

const char wpcap_version_string[] = "3.1 beta4" [static]

Definition at line 753 of file pcap.c.
Referenced by pcap_lib_version().


Data Structures
struct	singleton
struct	pkt_for_fakecallback
struct	dlt_choice
Defines
#define	DLT_CHOICE(code, description) { #code, description, code }
#define	DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
Functions
int	pcap_dispatch (pcap_t p, int cnt, pcap_handler callback, u_char user)
	It collects a group of packets.
int	pcap_read (pcap_t p, int cnt, pcap_handler callback, u_char user)
int	pcap_loop (pcap_t p, int cnt, pcap_handler callback, u_char user)
	It collects a group of packets.
void	pcap_oneshot (u_char userData, const struct pcap_pkthdr h, const u_char *pkt)
const u_char *	pcap_next (pcap_t p, struct pcap_pkthdr h)
	It returns the next available packet.
void	pcap_fakecallback (u_char userData, const struct pcap_pkthdr h, const u_char *pkt)
int	pcap_next_ex (pcap_t p, struct pcap_pkthdr pkt_header, const u_char *pkt_data)
	Read a packet from an interface or from an offline capture.
void	pcap_breakloop (pcap_t *p)
int	pcap_datalink (pcap_t *p)
	Returns the link layer of an adapter.
int	pcap_list_datalinks (pcap_t p, int *dlt_buffer)
int	pcap_set_datalink (pcap_t *p, int dlt)
int	pcap_strcasecmp (const char s1, const char s2)
int	pcap_datalink_name_to_val (const char *name)
const char *	pcap_datalink_val_to_name (int dlt)
const char *	pcap_datalink_val_to_description (int dlt)
int	pcap_snapshot (pcap_t *p)
	Returns the dimension of the packet portion (in bytes) that is delivered to the application.
int	pcap_is_swapped (pcap_t *p)
	returns true if the current savefile uses a different byte order than the current system.
int	pcap_major_version (pcap_t *p)
	returns the major version number of the pcap library used to write the savefile.
int	pcap_minor_version (pcap_t *p)
	returns the minor version number of the pcap library used to write the savefile.
FILE *	pcap_file (pcap_t *p)
	It returns the stdio stream of an offile capture.
int	pcap_fileno (pcap_t *p)
	It returns the file descriptor of a capture device.
void	pcap_perror (pcap_t p, char prefix)
	prints the text of the last pcap library error on stderr, prefixed by prefix.
char *	pcap_geterr (pcap_t *p)
	returns the error text pertaining to the last pcap library error.
int	pcap_getnonblock (pcap_t p, char errbuf)
	Gets the "non-blocking" state of an interface.
int	pcap_setnonblock (pcap_t p, int nonblock, char errbuf)
	Switches between blocking and nonblocking mode.
char *	pcap_win32strerror (void)
char *	pcap_strerror (int errnum)
	pcap_strerror() is provided in case strerror() isn't available.
int	pcap_setfilter (pcap_t p, struct bpf_program fp)
	Associates a filter to a capture.
int	pcap_stats (pcap_t p, struct pcap_stat ps)
	It returns statistics on current capture.
int	pcap_stats_dead (pcap_t p, struct pcap_stat ps)
void	pcap_close_dead (pcap_t *p)
pcap_t *	pcap_open_dead (int linktype, int snaplen)
	It creates a pcap_t structure without starting a capture.
void	pcap_close (pcap_t *p)
	closes the files associated with p and deallocates resources.
const char *	pcap_lib_version (void)
Variables
const char rcsid[]	_U_
dlt_choice	dlt_choices []
const u_char	charmap []
const char	wpcap_version_string [] = "3.1 beta4"
const char	pcap_version_string_fmt []
const char	pcap_version_string_packet_dll_fmt []
char *	pcap_version_string