The Tcpdump Group git mirrors - libpcap/blob - pcap.h

   1 /*
   2  * Copyright (c) 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the Computer Systems
  16  *      Engineering Group at Lawrence Berkeley Laboratory.
  17  * 4. Neither the name of the University nor of the Laboratory may be used
  18  *    to endorse or promote products derived from this software without
  19  *    specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.30 2000-10-25 06:59:10 guy Exp $ (LBL)
  34  */
  35
  36 #ifndef lib_pcap_h
  37 #define lib_pcap_h
  38
  39 #include <sys/types.h>
  40 #include <sys/time.h>
  41
  42 #include <net/bpf.h>
  43
  44 #include <stdio.h>
  45
  46 #ifdef __cplusplus
  47 extern "C" {
  48 #endif
  49
  50 #define PCAP_VERSION_MAJOR 2
  51 #define PCAP_VERSION_MINOR 4
  52
  53 #define PCAP_ERRBUF_SIZE 256
  54
  55 /*
  56  * Compatibility for systems that have a bpf.h that
  57  * predates the bpf typedefs for 64-bit support.
  58  */
  59 #if BPF_RELEASE - 0 < 199406
  60 typedef int bpf_int32;
  61 typedef u_int bpf_u_int32;
  62 #endif
  63
  64 typedef struct pcap pcap_t;
  65 typedef struct pcap_dumper pcap_dumper_t;
  66
  67 /*
  68  * The first record in the file contains saved values for some
  69  * of the flags used in the printout phases of tcpdump.
  70  * Many fields here are 32 bit ints so compilers won't insert unwanted
  71  * padding; these files need to be interchangeable across architectures.
  72  *
  73  * Do not change the layout of this structure, in any way (this includes
  74  * changes that only affect the length of fields in this structure).
  75  *
  76  * Also, do not change the interpretation of any of the members of this
  77  * structure, in any way (this includes using values other than
  78  * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
  79  * field).
  80  *
  81  * Instead:
  82  *
  83  *      introduce a new structure for the new format, if the layout
  84  *      of the structure changed;
  85  *
  86  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
  87  *      magic number for your new capture file format, and, when
  88  *      you get the new magic number, put it in "savefile.c";
  89  *
  90  *      use that magic number for save files with the changed file
  91  *      header;
  92  *
  93  *      make the code in "savefile.c" capable of reading files with
  94  *      the old file header as well as files with the new file header
  95  *      (using the magic number to determine the header format).
  96  *
  97  * Then supply the changes to "patches@tcpdump.org", so that future
  98  * versions of libpcap and programs that use it (such as tcpdump) will
  99  * be able to read your new capture file format.
 100  */
 101 struct pcap_file_header {
 102         bpf_u_int32 magic;
 103         u_short version_major;
 104         u_short version_minor;
 105         bpf_int32 thiszone;     /* gmt to local correction */
 106         bpf_u_int32 sigfigs;    /* accuracy of timestamps */
 107         bpf_u_int32 snaplen;    /* max length saved portion of each pkt */
 108         bpf_u_int32 linktype;   /* data link type (LINKTYPE_*) */
 109 };
 110
 111 /*
 112  * Each packet in the dump file is prepended with this generic header.
 113  * This gets around the problem of different headers for different
 114  * packet interfaces.
 115  */
 116 struct pcap_pkthdr {
 117         struct timeval ts;      /* time stamp */
 118         bpf_u_int32 caplen;     /* length of portion present */
 119         bpf_u_int32 len;        /* length this packet (off wire) */
 120 };
 121
 122 /*
 123  * As returned by the pcap_stats()
 124  */
 125 struct pcap_stat {
 126         u_int ps_recv;          /* number of packets received */
 127         u_int ps_drop;          /* number of packets dropped */
 128         u_int ps_ifdrop;        /* drops by interface XXX not yet supported */
 129 };
 130
 131 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
 132                              const u_char *);
 133
 134 char    *pcap_lookupdev(char *);
 135 int     pcap_lookupnet(char *, bpf_u_int32 *, bpf_u_int32 *, char *);
 136 pcap_t  *pcap_open_live(char *, int, int, int, char *);
 137 pcap_t  *pcap_open_dead(int, int);
 138 pcap_t  *pcap_open_offline(const char *, char *);
 139 void    pcap_close(pcap_t *);
 140 int     pcap_loop(pcap_t *, int, pcap_handler, u_char *);
 141 int     pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
 142 const u_char*
 143         pcap_next(pcap_t *, struct pcap_pkthdr *);
 144 int     pcap_stats(pcap_t *, struct pcap_stat *);
 145 int     pcap_setfilter(pcap_t *, struct bpf_program *);
 146 void    pcap_perror(pcap_t *, char *);
 147 char    *pcap_strerror(int);
 148 char    *pcap_geterr(pcap_t *);
 149 int     pcap_compile(pcap_t *, struct bpf_program *, char *, int,
 150             bpf_u_int32);
 151 int     pcap_compile_nopcap(int, int, struct bpf_program *,
 152             char *, int, bpf_u_int32);
 153 void    pcap_freecode(pcap_t *, struct bpf_program *);
 154 int     pcap_datalink(pcap_t *);
 155 int     pcap_snapshot(pcap_t *);
 156 int     pcap_is_swapped(pcap_t *);
 157 int     pcap_major_version(pcap_t *);
 158 int     pcap_minor_version(pcap_t *);
 159
 160 /* XXX */
 161 FILE    *pcap_file(pcap_t *);
 162 int     pcap_fileno(pcap_t *);
 163
 164 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
 165 void    pcap_dump_close(pcap_dumper_t *);
 166 void    pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
 167
 168 /* XXX this guy lives in the bpf tree */
 169 u_int   bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
 170 int     bpf_validate(struct bpf_insn *f, int len);
 171 char    *bpf_image(struct bpf_insn *, int);
 172 void    bpf_dump(struct bpf_program *, int);
 173
 174 #ifdef __cplusplus
 175 }
 176 #endif
 177
 178 #endif