pcap.h

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/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
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 *      Engineering Group at Lawrence Berkeley Laboratory.
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#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 HAVE_REMOTE
        // We have to define the SOCKET here, although it has been defined in sockutils.h
        // This is to avoid the distribution of the 'sockutils.h' file around
        // (for example in the WinPcap developer's pack)
        #ifndef SOCKET
                #ifdef WIN32
                        #define SOCKET unsigned int
                #else
                        #define SOCKET int
                #endif
        #endif
#endif

#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;

/*
 * Each packet in the dump file is prepended with this generic header.
 * This gets around the problem of different headers for different
 * packet interfaces.
 */
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 HAVE_REMOTE
        u_int ps_capt;          /* number of packets that are received by the application; please get rid off the Win32 ifdef */
        u_int ps_sent;          /* number of packets sent by the server on the network */
        u_int ps_netdrop;       /* number of packets lost on the network */
#endif /* HAVE_REMOTE */
};

#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);
char    *pcap_strerror(int);
char    *pcap_geterr(pcap_t *);
int     pcap_compile(pcap_t *, struct bpf_program *, char *, int,
            bpf_u_int32);
int     pcap_compile_nopcap(int, int, struct bpf_program *,
            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 HAVE_REMOTE
/* Includes most of the public stuff that is needed for the remote capture */
#include "remote-ext.h"
#endif   /* HAVE_REMOTE */

#ifdef __cplusplus
}
#endif

#endif

---