pcap.h

/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
/*
 * Copyright (c) 1993, 1994, 1995, 1996, 1997
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.52.2.7 2007/06/11 09:52:05 guy Exp $ (LBL)
 */

#ifndef lib_pcap_h
#define lib_pcap_h

#if defined(WIN32)
  #include <pcap-stdinc.h>
#elif defined(MSDOS)
  #include <sys/types.h>
  #include <sys/socket.h>  /* u_int, u_char etc. */
#else /* UN*X */
  #include <sys/types.h>
  #include <sys/time.h>
#endif /* WIN32/MSDOS/UN*X */

#ifndef PCAP_DONT_INCLUDE_PCAP_BPF_H
#include <pcap-bpf.h>
#endif

#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif

#define PCAP_VERSION_MAJOR 2
#define PCAP_VERSION_MINOR 4

#define PCAP_ERRBUF_SIZE 256

/*
 * Compatibility for systems that have a bpf.h that
 * predates the bpf typedefs for 64-bit support.
 */
#if BPF_RELEASE - 0 < 199406
typedef	int bpf_int32;
typedef	u_int bpf_u_int32;
#endif

typedef struct pcap pcap_t;
typedef struct pcap_dumper pcap_dumper_t;
typedef struct pcap_if pcap_if_t;
typedef struct pcap_addr pcap_addr_t;

/*
 * The first record in the file contains saved values for some
 * of the flags used in the printout phases of tcpdump.
 * Many fields here are 32 bit ints so compilers won't insert unwanted
 * padding; these files need to be interchangeable across architectures.
 *
 * Do not change the layout of this structure, in any way (this includes
 * changes that only affect the length of fields in this structure).
 *
 * Also, do not change the interpretation of any of the members of this
 * structure, in any way (this includes using values other than
 * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
 * field).
 *
 * Instead:
 *
 *	introduce a new structure for the new format, if the layout
 *	of the structure changed;
 *
 *	send mail to "tcpdump-workers@tcpdump.org", requesting a new
 *	magic number for your new capture file format, and, when
 *	you get the new magic number, put it in "savefile.c";
 *
 *	use that magic number for save files with the changed file
 *	header;
 *
 *	make the code in "savefile.c" capable of reading files with
 *	the old file header as well as files with the new file header
 *	(using the magic number to determine the header format).
 *
 * Then supply the changes to "patches@tcpdump.org", so that future
 * versions of libpcap and programs that use it (such as tcpdump) will
 * be able to read your new capture file format.
 */
struct pcap_file_header {
	bpf_u_int32 magic;
	u_short version_major;
	u_short version_minor;
	bpf_int32 thiszone;	/* gmt to local correction */
	bpf_u_int32 sigfigs;	/* accuracy of timestamps */
	bpf_u_int32 snaplen;	/* max length saved portion of each pkt */
	bpf_u_int32 linktype;	/* data link type (LINKTYPE_*) */
};

typedef enum {
       PCAP_D_INOUT = 0,
       PCAP_D_IN,
       PCAP_D_OUT
} pcap_direction_t;

/*
 * Generic per-packet information, as supplied by libpcap.
 *
 * The time stamp can and should be a "struct timeval", regardless of
 * whether your system supports 32-bit tv_sec in "struct timeval",
 * 64-bit tv_sec in "struct timeval", or both if it supports both 32-bit
 * and 64-bit applications.  The on-disk format of savefiles uses 32-bit
 * tv_sec (and tv_usec); this structure is irrelevant to that.  32-bit
 * and 64-bit versions of libpcap, even if they're on the same platform,
 * should supply the appropriate version of "struct timeval", even if
 * that's not what the underlying packet capture mechanism supplies.
 */
struct pcap_pkthdr {
	struct timeval ts;	/* time stamp */
	bpf_u_int32 caplen;	/* length of portion present */
	bpf_u_int32 len;	/* length this packet (off wire) */
};

/*
 * As returned by the pcap_stats()
 */
struct pcap_stat {
	u_int ps_recv;		/* number of packets received */
	u_int ps_drop;		/* number of packets dropped */
	u_int ps_ifdrop;	/* drops by interface XXX not yet supported */
#ifdef WIN32
	u_int bs_capt;		/* number of packets that reach the application */
#endif /* WIN32 */
};

#ifdef MSDOS
/*
 * As returned by the pcap_stats_ex()
 */
struct pcap_stat_ex {
       u_long  rx_packets;        /* total packets received       */
       u_long  tx_packets;        /* total packets transmitted    */
       u_long  rx_bytes;          /* total bytes received         */
       u_long  tx_bytes;          /* total bytes transmitted      */
       u_long  rx_errors;         /* bad packets received         */
       u_long  tx_errors;         /* packet transmit problems     */
       u_long  rx_dropped;        /* no space in Rx buffers       */
       u_long  tx_dropped;        /* no space available for Tx    */
       u_long  multicast;         /* multicast packets received   */
       u_long  collisions;

       /* detailed rx_errors: */
       u_long  rx_length_errors;
       u_long  rx_over_errors;    /* receiver ring buff overflow  */
       u_long  rx_crc_errors;     /* recv'd pkt with crc error    */
       u_long  rx_frame_errors;   /* recv'd frame alignment error */
       u_long  rx_fifo_errors;    /* recv'r fifo overrun          */
       u_long  rx_missed_errors;  /* recv'r missed packet         */

       /* detailed tx_errors */
       u_long  tx_aborted_errors;
       u_long  tx_carrier_errors;
       u_long  tx_fifo_errors;
       u_long  tx_heartbeat_errors;
       u_long  tx_window_errors;
     };
#endif

/*
 * Item in a list of interfaces.
 */
struct pcap_if {
	struct pcap_if *next;
	char *name;		/* name to hand to "pcap_open_live()" */
	char *description;	/* textual description of interface, or NULL */
	struct pcap_addr *addresses;
	bpf_u_int32 flags;	/* PCAP_IF_ interface flags */
};

#define PCAP_IF_LOOPBACK	0x00000001	/* interface is loopback */

/*
 * Representation of an interface address.
 */
struct pcap_addr {
	struct pcap_addr *next;
	struct sockaddr *addr;		/* address */
	struct sockaddr *netmask;	/* netmask for that address */
	struct sockaddr *broadaddr;	/* broadcast address for that address */
	struct sockaddr *dstaddr;	/* P2P destination address for that address */
};

typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
			     const u_char *);

char	*pcap_lookupdev(char *);
int	pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
pcap_t	*pcap_open_live(const char *, int, int, int, char *);
pcap_t	*pcap_open_dead(int, int);
pcap_t	*pcap_open_offline(const char *, char *);
pcap_t	*pcap_fopen_offline(FILE *, char *);
void	pcap_close(pcap_t *);
int	pcap_loop(pcap_t *, int, pcap_handler, u_char *);
int	pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
const u_char*
	pcap_next(pcap_t *, struct pcap_pkthdr *);
int 	pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **);
void	pcap_breakloop(pcap_t *);
int	pcap_stats(pcap_t *, struct pcap_stat *);
int	pcap_setfilter(pcap_t *, struct bpf_program *);
int 	pcap_setdirection(pcap_t *, pcap_direction_t);
int	pcap_getnonblock(pcap_t *, char *);
int	pcap_setnonblock(pcap_t *, int, char *);
void	pcap_perror(pcap_t *, char *);
int	pcap_inject(pcap_t *, const void *, size_t);
int	pcap_sendpacket(pcap_t *, const u_char *, int);
const char *pcap_strerror(int);
char	*pcap_geterr(pcap_t *);
int	pcap_compile(pcap_t *, struct bpf_program *, const char *, int,
	    bpf_u_int32);
int	pcap_compile_nopcap(int, int, struct bpf_program *,
	    const char *, int, bpf_u_int32);
void	pcap_freecode(struct bpf_program *);
int	pcap_datalink(pcap_t *);
int	pcap_list_datalinks(pcap_t *, int **);
int	pcap_set_datalink(pcap_t *, int);
int	pcap_datalink_name_to_val(const char *);
const char *pcap_datalink_val_to_name(int);
const char *pcap_datalink_val_to_description(int);
int	pcap_snapshot(pcap_t *);
int	pcap_is_swapped(pcap_t *);
int	pcap_major_version(pcap_t *);
int	pcap_minor_version(pcap_t *);

/* XXX */
FILE	*pcap_file(pcap_t *);
int	pcap_fileno(pcap_t *);

pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
pcap_dumper_t *pcap_dump_fopen(pcap_t *, FILE *fp);
FILE	*pcap_dump_file(pcap_dumper_t *);
long	pcap_dump_ftell(pcap_dumper_t *);
int	pcap_dump_flush(pcap_dumper_t *);
void	pcap_dump_close(pcap_dumper_t *);
void	pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);

int	pcap_findalldevs(pcap_if_t **, char *);
void	pcap_freealldevs(pcap_if_t *);

const char *pcap_lib_version(void);

/* XXX this guy lives in the bpf tree */
u_int	bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
int	bpf_validate(struct bpf_insn *f, int len);
char	*bpf_image(struct bpf_insn *, int);
void	bpf_dump(struct bpf_program *, int);

#if defined(WIN32)

/*
 * Win32 definitions
 */

int pcap_setbuff(pcap_t *p, int dim);
int pcap_setmode(pcap_t *p, int mode);
int pcap_setmintocopy(pcap_t *p, int size);

#ifdef WPCAP
/* Include file with the wpcap-specific extensions */
#include <Win32-Extensions.h>
#endif /* WPCAP */

#define MODE_CAPT 0
#define MODE_STAT 1
#define MODE_MON 2

#elif defined(MSDOS)

/*
 * MS-DOS definitions
 */

int  pcap_stats_ex (pcap_t *, struct pcap_stat_ex *);
void pcap_set_wait (pcap_t *p, void (*yield)(void), int wait);
u_long pcap_mac_packets (void);

#else /* UN*X */

/*
 * UN*X definitions
 */

int	pcap_get_selectable_fd(pcap_t *);

#endif /* WIN32/MSDOS/UN*X */

#ifdef __cplusplus
}
#endif

#endif