[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.
 *
 * @(#) $Header: /tcpdump/master/libpcap/pcap-int.h,v 1.68.2.10 2007-03-11 21:44:51 guy Exp $ (LBL)
 */

#ifndef pcap_int_h
#define pcap_int_h

#ifdef __cplusplus
extern "C" {
#endif

#include <pcap.h>

#ifdef WIN32
#include <Packet32.h>
#endif /* WIN32 */

#ifdef MSDOS
#include <fcntl.h>
#include <io.h>
#endif

/*
 * Savefile
 */
typedef enum {
        NOT_SWAPPED,
        SWAPPED,
        MAYBE_SWAPPED
} swapped_type_t;

struct pcap_sf {
        FILE *rfile;
        int swapped;
        int hdrsize;
        swapped_type_t lengths_swapped;
        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 */
        char    *device;        /* device name */
#ifdef linux
        int     sock_packet;    /* using Linux 2.0 compatible interface */
        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     ifindex;        /* interface index of device we're bound to */
        int     lo_ifindex;     /* interface index of the loopback device */
        struct pcap *next;      /* list of open promiscuous sock_packet pcaps */
        u_int   packets_read;   /* count of packets read with recvfrom() */
#endif

#ifdef HAVE_DAG_API
#ifdef HAVE_DAG_STREAMS_API
        u_char  *dag_mem_bottom;        /* DAG card current memory bottom pointer */
        u_char  *dag_mem_top;   /* DAG card current memory top pointer */
#else
        void    *dag_mem_base;  /* DAG card memory base address */
        u_int   dag_mem_bottom; /* DAG card current memory bottom offset */
        u_int   dag_mem_top;    /* DAG card current memory top offset */
#endif /* HAVE_DAG_STREAMS_API */
        int     dag_fcs_bits;   /* Number of checksum bits from link layer */
        int     dag_offset_flags; /* Flags to pass to dag_offset(). */
        int     dag_stream;     /* DAG stream number */
        int     dag_timeout;    /* timeout specified to pcap_open_live.
                                 * Same as in linux above, introduce
                                 * generally? */
#endif /* HAVE_DAG_API */
};

/*
 * 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 some versions of NetBSD pad FDDI packets to make everything
 * line up on a nice boundary.
 */
#ifdef __NetBSD__
#include <sys/param.h>  /* needed to declare __NetBSD_Version__ */
#endif

#if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000)
#define       PCAP_FDDIPAD 3
#endif

struct pcap {
#ifdef WIN32
        ADAPTER *adapter;
        LPPACKET Packet;
        int timeout;
        int nonblock;
#else
        int fd;
        int selectable_fd;
        int send_fd;
#endif /* WIN32 */
        int snapshot;
        int linktype;
        int tzoff;              /* timezone offset */
        int offset;             /* offset for proper alignment */

        int break_loop;         /* flag set to force break from packet-reading loop */

#ifdef PCAP_FDDIPAD
        int fddipad;
#endif

#ifdef MSDOS
        int inter_packet_wait;   /* offline: wait between packets */
        void (*wait_proc)(void); /*          call proc while waiting */
#endif

        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;

        /* We're accepting only packets in this direction/these directions. */
        pcap_direction_t direction;

        /*
         * Methods.
         */
        int     (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
        int     (*inject_op)(pcap_t *, const void *, size_t);
        int     (*setfilter_op)(pcap_t *, struct bpf_program *);
        int     (*setdirection_op)(pcap_t *, pcap_direction_t);
        int     (*set_datalink_op)(pcap_t *, int);
        int     (*getnonblock_op)(pcap_t *, char *);
        int     (*setnonblock_op)(pcap_t *, int, char *);
        int     (*stats_op)(pcap_t *, struct pcap_stat *);
        void    (*close_op)(pcap_t *);

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

        char errbuf[PCAP_ERRBUF_SIZE + 1];
        int dlt_count;
        u_int *dlt_list;

        struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
};

/*
 * This is a timeval as stored in a savefile.
 * It has to use the same types everywhere, independent of the actual
 * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
 * platforms and 64-bit tv_sec values on other platforms, and writing
 * out native `struct timeval' values would mean files could only be
 * read on systems with the same tv_sec size as the system on which
 * the file was written.
 */

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

/*
 * This is a `pcap_pkthdr' as actually stored in a savefile.
 *
 * 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 savefiles 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 *);

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

#include <stdarg.h>

#if !defined(HAVE_SNPRINTF)
#define snprintf pcap_snprintf
extern int snprintf (char *, size_t, const char *, ...);
#endif

#if !defined(HAVE_VSNPRINTF)
#define vsnprintf pcap_vsnprintf
extern int vsnprintf (char *, size_t, const char *, va_list ap);
#endif

/*
 * Routines that most pcap implementations can use for non-blocking mode.
 */
#if !defined(WIN32) && !defined(MSDOS)
int     pcap_getnonblock_fd(pcap_t *, char *);
int     pcap_setnonblock_fd(pcap_t *p, int, char *);
#endif

void    pcap_close_common(pcap_t *);

/*
 * Internal interfaces for "pcap_findalldevs()".
 *
 * "pcap_platform_finddevs()" is a platform-dependent routine to
 * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 * "getifaddrs()", etc..
 *
 * "pcap_add_if()" adds an interface to the list of interfaces.
 */
int     pcap_platform_finddevs(pcap_if_t **, char *);
int     add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
            size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
            struct sockaddr *, size_t, char *);
int     pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
            const char *, char *);

#ifdef WIN32
char    *pcap_win32strerror(void);
#endif

int     install_bpf_program(pcap_t *, struct bpf_program *);

int     pcap_strcasecmp(const char *, const char *);

#ifdef __cplusplus
}
#endif

#endif