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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.
 *
 * @(#) $Header$ (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 */
#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 NetBSD pad to make everything line up on a nice boundary.
 */
#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 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 *);

#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

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