freebsd-src/contrib/libpcap/pcap-int.h

/*
 * Copyright (c) 1994, 1995, 1996
 *	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.
 *
 * $FreeBSD$
 * @(#) $Header: /tcpdump/master/libpcap/pcap-int.h,v 1.32 2000/12/21 10:29:23 guy Exp $ (LBL)
 */

#ifndef pcap_int_h
#define pcap_int_h

#ifdef __cplusplus
extern "C" {
#endif

#include <pcap.h>

/*
 * Savefile
 */
struct pcap_sf {
	FILE *rfile;
	int swapped;
	int hdrsize;
	int version_major;
	int version_minor;
	u_char *base;
};

struct pcap_md {
	struct pcap_stat stat;
	/*XXX*/
	int use_bpf;		/* using kernel filter */
	u_long	TotPkts;	/* can't oflow for 79 hrs on ether */
	u_long	TotAccepted;	/* count accepted by filter */
	u_long	TotDrops;	/* count of dropped packets */
	long	TotMissed;	/* missed by i/f during this run */
	long	OrigMissed;	/* missed by i/f before this run */
#ifdef linux
	int	sock_packet;	/* using Linux 2.0 compatible interface */
	int	readlen;	/* byte count to hand to "recvmsg()" */
	int	timeout;	/* timeout specified to pcap_open_live */
	int	clear_promisc;	/* must clear promiscuous mode when we close */
	int	cooked;		/* using SOCK_DGRAM rather than SOCK_RAW */
	int	lo_ifindex;	/* interface index of the loopback device */
	char 	*device;	/* device name */
	struct pcap *next;	/* list of open promiscuous sock_packet pcaps */
#endif
};

struct pcap {
	int fd;
	int snapshot;
	int linktype;
	int tzoff;		/* timezone offset */
	int offset;		/* offset for proper alignment */

	struct pcap_sf sf;
	struct pcap_md md;

	/*
	 * Read buffer.
	 */
	int bufsize;
	u_char *buffer;
	u_char *bp;
	int cc;

	/*
	 * Place holder for pcap_next().
	 */
	u_char *pkt;

	
	/*
	 * Placeholder for filter code if bpf not in kernel.
	 */
	struct bpf_program fcode;

	char errbuf[PCAP_ERRBUF_SIZE];
};

/*
 * This is a timeval as stored in disk in a dumpfile.
 * It has to use the same types everywhere, independent of the actual
 * `struct timeval'
 */

struct pcap_timeval {
    bpf_int32 tv_sec;		/* seconds */
    bpf_int32 tv_usec;		/* microseconds */
};

/*
 * How a `pcap_pkthdr' is actually stored in the dumpfile.
 *
 * Do not change the format of this structure, in any way (this includes
 * changes that only affect the length of fields in this structure),
 * and do not make the time stamp anything other than seconds and
 * microseconds (e.g., seconds and nanoseconds).  Instead:
 *
 *	introduce a new structure for the new format;
 *
 *	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 record
 *	header;
 *
 *	make the code in "savefile.c" capable of reading files with
 *	the old record header as well as files with the new record 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_sf_pkthdr {
    struct pcap_timeval ts;	/* time stamp */
    bpf_u_int32 caplen;		/* length of portion present */
    bpf_u_int32 len;		/* length this packet (off wire) */
};

/*
 * How a `pcap_pkthdr' is actually stored in dumpfiles written
 * by some patched versions of libpcap (e.g. the ones in Red
 * Hat Linux 6.1 and 6.2).
 *
 * Do not change the format of this structure, in any way (this includes
 * changes that only affect the length of fields in this structure).
 * Instead, introduce a new structure, as per the above.
 */

struct pcap_sf_patched_pkthdr {
    struct pcap_timeval ts;	/* time stamp */
    bpf_u_int32 caplen;		/* length of portion present */
    bpf_u_int32 len;		/* length this packet (off wire) */
    int		index;
    unsigned short protocol;
    unsigned char pkt_type;
};

int	yylex(void);

#ifndef min
#define min(a, b) ((a) > (b) ? (b) : (a))
#endif

/* XXX should these be in pcap.h? */
int	pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
int	pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);

/*
 * Ultrix, DEC OSF/1^H^H^H^H^H^H^H^H^HDigital UNIX^H^H^H^H^H^H^H^H^H^H^H^H
 * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 */
#if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
#define       PCAP_FDDIPAD 3
#endif

#ifndef HAVE_STRLCPY
#define strlcpy(x, y, z) \
	(strncpy((x), (y), (z)), \
	 ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
	 strlen((y)))
#endif

#ifdef linux
void	pcap_close_linux(pcap_t *);
#endif

/* XXX */
extern	int pcap_fddipad;

int	install_bpf_program(pcap_t *, struct bpf_program *);

#ifdef __cplusplus
}
#endif

#endif