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[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 1.94 2008-09-16 00:20:23 guy Exp $ (LBL)
 */

#ifndef pcap_int_h
#define pcap_int_h

#include <pcap/pcap.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifdef HAVE_LIBDLPI
#include <libdlpi.h>
#endif

#ifdef WIN32
#include <Packet32.h>
extern CRITICAL_SECTION g_PcapCompileCriticalSection;
#endif /* WIN32 */

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

#ifdef HAVE_SNF_API
#include <snf.h>
#endif

#if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/

/*
 * Swap byte ordering of unsigned long long timestamp on a big endian
 * machine.
 */
#define SWAPLL(ull)  ((ull & 0xff00000000000000) >> 56) | \
                      ((ull & 0x00ff000000000000) >> 40) | \
                      ((ull & 0x0000ff0000000000) >> 24) | \
                      ((ull & 0x000000ff00000000) >> 8)  | \
                      ((ull & 0x00000000ff000000) << 8)  | \
                      ((ull & 0x0000000000ff0000) << 24) | \
                      ((ull & 0x000000000000ff00) << 40) | \
                      ((ull & 0x00000000000000ff) << 56)

#else /* A recent Visual studio compiler or not VC */

/*
 * Swap byte ordering of unsigned long long timestamp on a big endian
 * machine.
 */
#define SWAPLL(ull)  ((ull & 0xff00000000000000LL) >> 56) | \
                      ((ull & 0x00ff000000000000LL) >> 40) | \
                      ((ull & 0x0000ff0000000000LL) >> 24) | \
                      ((ull & 0x000000ff00000000LL) >> 8)  | \
                      ((ull & 0x00000000ff000000LL) << 8)  | \
                      ((ull & 0x0000000000ff0000LL) << 24) | \
                      ((ull & 0x000000000000ff00LL) << 40) | \
                      ((ull & 0x00000000000000ffLL) << 56)

#endif /* _MSC_VER */

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

/*
 * Used when reading a savefile.
 */
struct pcap_sf {
        FILE *rfile;
        int (*next_packet_op)(pcap_t *, struct pcap_pkthdr *, u_char **);
        int swapped;
        size_t hdrsize;
        swapped_type_t lengths_swapped;
        int version_major;
        int version_minor;
        bpf_u_int32 ifcount;    /* number of interfaces seen in this capture */
        u_int tsresol;          /* time stamp resolution */
        u_int tsscale;          /* scaling factor for resolution -> microseconds */
        u_int64_t tsoffset;     /* time stamp offset */
};

/*
 * Used when doing a live capture.
 */
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 */
        int     timeout;        /* timeout for buffering */
        int     must_do_on_close; /* stuff we must do when we close */
        struct pcap *next;      /* list of open pcaps that need stuff cleared on close */
#ifdef linux
        int     sock_packet;    /* using Linux 2.0 compatible interface */
        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 */
        u_int   packets_read;   /* count of packets read with recvfrom() */
        bpf_u_int32 oldmode;    /* mode to restore when turning monitor mode off */
        char    *mondevice;     /* mac80211 monitor device we created */
        u_char  *mmapbuf;       /* memory-mapped region pointer */
        size_t  mmapbuflen;     /* size of region */
        int     vlan_offset;    /* offset at which to insert vlan tags; if -1, don't insert */
        u_int   tp_version;     /* version of tpacket_hdr for mmaped ring */
        u_int   tp_hdrlen;      /* hdrlen of tpacket_hdr for mmaped ring */
        u_char  *oneshot_buffer; /* buffer for copy of packet */
        long    proc_dropped; /* packets reported dropped by /proc/net/dev */
#endif /* linux */

#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 /* HAVE_DAG_STREAMS_API */
        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 */
#ifdef HAVE_SNF_API
        snf_handle_t snf_handle; /* opaque device handle */
        snf_ring_t   snf_ring;   /* opaque device ring handle */
        int          snf_timeout;
        int          snf_boardnum;
#endif /*HAVE_SNF_API*/

#ifdef HAVE_ZEROCOPY_BPF
       /*
        * Zero-copy read buffer -- for zero-copy BPF.  'buffer' above will
        * alternative between these two actual mmap'd buffers as required.
        * As there is a header on the front size of the mmap'd buffer, only
        * some of the buffer is exposed to libpcap as a whole via bufsize;
        * zbufsize is the true size.  zbuffer tracks the current zbuf
        * assocated with buffer so that it can be used to decide which the
        * next buffer to read will be.
        */
       u_char *zbuf1, *zbuf2, *zbuffer;
       u_int zbufsize;
       u_int zerocopy;
       u_int interrupted;
       struct timespec firstsel;
       /*
        * If there's currently a buffer being actively processed, then it is
        * referenced here; 'buffer' is also pointed at it, but offset by the
        * size of the header.
        */
       struct bpf_zbuf_header *bzh;
#endif /* HAVE_ZEROCOPY_BPF */

       void *priv;
};

/*
 * Stuff to do when we close.
 */
#define MUST_CLEAR_PROMISC      0x00000001      /* clear promiscuous mode */
#define MUST_CLEAR_RFMON        0x00000002      /* clear rfmon (monitor) mode */
#define MUST_DELETE_MONIF       0x00000004      /* delete monitor-mode interface */

struct pcap_opt {
        int     buffer_size;
        char    *source;
        int     promisc;
        int     rfmon;
        int     tstamp_type;
};

/*
 * 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

typedef int     (*activate_op_t)(pcap_t *);
typedef int     (*can_set_rfmon_op_t)(pcap_t *);
typedef int     (*read_op_t)(pcap_t *, int cnt, pcap_handler, u_char *);
typedef int     (*inject_op_t)(pcap_t *, const void *, size_t);
typedef int     (*setfilter_op_t)(pcap_t *, struct bpf_program *);
typedef int     (*setdirection_op_t)(pcap_t *, pcap_direction_t);
typedef int     (*set_datalink_op_t)(pcap_t *, int);
typedef int     (*getnonblock_op_t)(pcap_t *, char *);
typedef int     (*setnonblock_op_t)(pcap_t *, int, char *);
typedef int     (*stats_op_t)(pcap_t *, struct pcap_stat *);
#ifdef WIN32
typedef int     (*setbuff_op_t)(pcap_t *, int);
typedef int     (*setmode_op_t)(pcap_t *, int);
typedef int     (*setmintocopy_op_t)(pcap_t *, int);
#endif
typedef void    (*cleanup_op_t)(pcap_t *);

struct pcap {
#ifdef WIN32
        ADAPTER *adapter;
        LPPACKET Packet;
        int nonblock;
#else
        int fd;
        int selectable_fd;
        int send_fd;
#endif /* WIN32 */

#ifdef HAVE_LIBDLPI
        dlpi_handle_t dlpi_hd;
#endif
        int snapshot;
        int linktype;           /* Network linktype */
        int linktype_ext;       /* Extended information stored in the linktype field of a file */
        int tzoff;              /* timezone offset */
        int offset;             /* offset for proper alignment */
        int activated;          /* true if the capture is really started */
        int oldstyle;           /* if we're opening with pcap_open_live() */

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

#ifdef PCAP_FDDIPAD
        int fddipad;
#endif

#ifdef MSDOS
        void (*wait_proc)(void); /*          call proc while waiting */
#endif

        struct pcap_sf sf;
        struct pcap_md md;
        struct pcap_opt opt;

        /*
         * 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.
         */
        activate_op_t activate_op;
        can_set_rfmon_op_t can_set_rfmon_op;
        read_op_t read_op;
        inject_op_t inject_op;
        setfilter_op_t setfilter_op;
        setdirection_op_t setdirection_op;
        set_datalink_op_t set_datalink_op;
        getnonblock_op_t getnonblock_op;
        setnonblock_op_t setnonblock_op;
        stats_op_t stats_op;

        /*
         * Routine to use as callback for pcap_next()/pcap_next_ex().
         */
        pcap_handler oneshot_callback;

#ifdef WIN32
        /*
         * These are, at least currently, specific to the Win32 NPF
         * driver.
         */
        setbuff_op_t setbuff_op;
        setmode_op_t setmode_op;
        setmintocopy_op_t setmintocopy_op;
#endif
        cleanup_op_t cleanup_op;

        /*
         * 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;
        int tstamp_type_count;
        u_int *tstamp_type_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@lists.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 by forking the branch at
 *
 *      https://github.com/the-tcpdump-group/libpcap/issues
 *
 * and issuing a pull request, 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;
};

/*
 * User data structure for the one-shot callback used for pcap_next()
 * and pcap_next_ex().
 */
struct oneshot_userdata {
        struct pcap_pkthdr *hdr;
        const u_char **pkt;
        pcap_t *pd;
};

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

/*
 * Internal interfaces for "pcap_create()".
 *
 * "pcap_create_interface()" is the routine to do a pcap_create on
 * a regular network interface.  There are multiple implementations
 * of this, one for each platform type (Linux, BPF, DLPI, etc.),
 * with the one used chosen by the configure script.
 *
 * "pcap_create_common()" allocates and fills in a pcap_t, for use
 * by pcap_create routines.
 */
pcap_t  *pcap_create_interface(const char *, char *);
pcap_t  *pcap_create_common(const char *, char *);
int     pcap_do_addexit(pcap_t *);
void    pcap_add_to_pcaps_to_close(pcap_t *);
void    pcap_remove_from_pcaps_to_close(pcap_t *);
void    pcap_cleanup_live_common(pcap_t *);
int     pcap_not_initialized(pcap_t *);
int     pcap_check_activated(pcap_t *);

/*
 * Internal interfaces for "pcap_findalldevs()".
 *
 * "pcap_findalldevs_interfaces()" finds interfaces using the
 * "standard" mechanisms (SIOCGIFCONF, "getifaddrs()", etc.).
 *
 * "pcap_platform_finddevs()" is a platform-dependent routine to
 * add devices not found by the "standard" mechanisms.
 *
 * "pcap_add_if()" adds an interface to the list of interfaces, for
 * use by various "find interfaces" routines.
 */
int     pcap_findalldevs_interfaces(pcap_if_t **, char *);
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