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

   1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
   2 /*
   3  * Copyright (c) 1993, 1994, 1995, 1996, 1997
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the Computer Systems
  17  *      Engineering Group at Lawrence Berkeley Laboratory.
  18  * 4. Neither the name of the University nor of the Laboratory may be used
  19  *    to endorse or promote products derived from this software without
  20  *    specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.40 2002-12-22 02:36:51 guy Exp $ (LBL)
  35  */
  36
  37 #ifndef lib_pcap_h
  38 #define lib_pcap_h
  39
  40 #ifdef WIN32
  41 #include <pcap-stdinc.h>
  42 #else /* WIN32 */
  43 #include <sys/types.h>
  44 #include <sys/time.h>
  45 #endif /* WIN32 */
  46
  47 #include <net/bpf.h>
  48
  49 #include <stdio.h>
  50
  51 #ifdef __cplusplus
  52 extern "C" {
  53 #endif
  54
  55 #define PCAP_VERSION_MAJOR 2
  56 #define PCAP_VERSION_MINOR 4
  57
  58 #define PCAP_ERRBUF_SIZE 256
  59
  60 /*
  61  * Compatibility for systems that have a bpf.h that
  62  * predates the bpf typedefs for 64-bit support.
  63  */
  64 #if BPF_RELEASE - 0 < 199406
  65 typedef int bpf_int32;
  66 typedef u_int bpf_u_int32;
  67 #endif
  68
  69 typedef struct pcap pcap_t;
  70 typedef struct pcap_dumper pcap_dumper_t;
  71 typedef struct pcap_if pcap_if_t;
  72 typedef struct pcap_addr pcap_addr_t;
  73
  74 /*
  75  * The first record in the file contains saved values for some
  76  * of the flags used in the printout phases of tcpdump.
  77  * Many fields here are 32 bit ints so compilers won't insert unwanted
  78  * padding; these files need to be interchangeable across architectures.
  79  *
  80  * Do not change the layout of this structure, in any way (this includes
  81  * changes that only affect the length of fields in this structure).
  82  *
  83  * Also, do not change the interpretation of any of the members of this
  84  * structure, in any way (this includes using values other than
  85  * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
  86  * field).
  87  *
  88  * Instead:
  89  *
  90  *      introduce a new structure for the new format, if the layout
  91  *      of the structure changed;
  92  *
  93  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
  94  *      magic number for your new capture file format, and, when
  95  *      you get the new magic number, put it in "savefile.c";
  96  *
  97  *      use that magic number for save files with the changed file
  98  *      header;
  99  *
 100  *      make the code in "savefile.c" capable of reading files with
 101  *      the old file header as well as files with the new file header
 102  *      (using the magic number to determine the header format).
 103  *
 104  * Then supply the changes to "patches@tcpdump.org", so that future
 105  * versions of libpcap and programs that use it (such as tcpdump) will
 106  * be able to read your new capture file format.
 107  */
 108 struct pcap_file_header {
 109         bpf_u_int32 magic;
 110         u_short version_major;
 111         u_short version_minor;
 112         bpf_int32 thiszone;     /* gmt to local correction */
 113         bpf_u_int32 sigfigs;    /* accuracy of timestamps */
 114         bpf_u_int32 snaplen;    /* max length saved portion of each pkt */
 115         bpf_u_int32 linktype;   /* data link type (LINKTYPE_*) */
 116 };
 117
 118 /*
 119  * Each packet in the dump file is prepended with this generic header.
 120  * This gets around the problem of different headers for different
 121  * packet interfaces.
 122  */
 123 struct pcap_pkthdr {
 124         struct timeval ts;      /* time stamp */
 125         bpf_u_int32 caplen;     /* length of portion present */
 126         bpf_u_int32 len;        /* length this packet (off wire) */
 127 };
 128
 129 /*
 130  * As returned by the pcap_stats()
 131  */
 132 struct pcap_stat {
 133         u_int ps_recv;          /* number of packets received */
 134         u_int ps_drop;          /* number of packets dropped */
 135         u_int ps_ifdrop;        /* drops by interface XXX not yet supported */
 136 #ifdef WIN32
 137         u_int bs_capt;          /* number of packets that reach the application */
 138 #endif /* WIN32 */
 139 };
 140
 141 /*
 142  * Item in a list of interfaces.
 143  */
 144 struct pcap_if {
 145         struct pcap_if *next;
 146         char *name;             /* name to hand to "pcap_open_live()" */
 147         char *description;      /* textual description of interface, or NULL */
 148         struct pcap_addr *addresses;
 149         bpf_u_int32 flags;      /* PCAP_IF_ interface flags */
 150 };
 151
 152 #define PCAP_IF_LOOPBACK        0x00000001      /* interface is loopback */
 153
 154 /*
 155  * Representation of an interface address.
 156  */
 157 struct pcap_addr {
 158         struct pcap_addr *next;
 159         struct sockaddr *addr;          /* address */
 160         struct sockaddr *netmask;       /* netmask for that address */
 161         struct sockaddr *broadaddr;     /* broadcast address for that address */
 162         struct sockaddr *dstaddr;       /* P2P destination address for that address */
 163 };
 164
 165 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
 166                              const u_char *);
 167
 168 char    *pcap_lookupdev(char *);
 169 int     pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
 170 pcap_t  *pcap_open_live(const char *, int, int, int, char *);
 171 pcap_t  *pcap_open_dead(int, int);
 172 pcap_t  *pcap_open_offline(const char *, char *);
 173 void    pcap_close(pcap_t *);
 174 int     pcap_loop(pcap_t *, int, pcap_handler, u_char *);
 175 int     pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
 176 const u_char*
 177         pcap_next(pcap_t *, struct pcap_pkthdr *);
 178 int     pcap_stats(pcap_t *, struct pcap_stat *);
 179 int     pcap_setfilter(pcap_t *, struct bpf_program *);
 180 int     pcap_getnonblock(pcap_t *, char *);
 181 int     pcap_setnonblock(pcap_t *, int, char *);
 182 void    pcap_perror(pcap_t *, char *);
 183 char    *pcap_strerror(int);
 184 char    *pcap_geterr(pcap_t *);
 185 int     pcap_compile(pcap_t *, struct bpf_program *, char *, int,
 186             bpf_u_int32);
 187 int     pcap_compile_nopcap(int, int, struct bpf_program *,
 188             char *, int, bpf_u_int32);
 189 void    pcap_freecode(struct bpf_program *);
 190 int     pcap_datalink(pcap_t *);
 191 int     pcap_list_datalinks(pcap_t *, int **);
 192 int     pcap_set_datalink(pcap_t *, int);
 193 int     pcap_datalink_name_to_val(const char *);
 194 const char *pcap_datalink_val_to_name(int);
 195 int     pcap_snapshot(pcap_t *);
 196 int     pcap_is_swapped(pcap_t *);
 197 int     pcap_major_version(pcap_t *);
 198 int     pcap_minor_version(pcap_t *);
 199
 200 /* XXX */
 201 FILE    *pcap_file(pcap_t *);
 202 int     pcap_fileno(pcap_t *);
 203
 204 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
 205 void    pcap_dump_flush(pcap_dumper_t *);
 206 void    pcap_dump_close(pcap_dumper_t *);
 207 void    pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
 208
 209 int     pcap_findalldevs(pcap_if_t **, char *);
 210 void    pcap_freealldevs(pcap_if_t *);
 211
 212 /* XXX this guy lives in the bpf tree */
 213 u_int   bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
 214 int     bpf_validate(struct bpf_insn *f, int len);
 215 char    *bpf_image(struct bpf_insn *, int);
 216 void    bpf_dump(struct bpf_program *, int);
 217
 218 #ifdef WIN32
 219 /*
 220  * Win32 definitions
 221  */
 222
 223 int pcap_setbuff(pcap_t *p, int dim);
 224 int pcap_setmode(pcap_t *p, int mode);
 225 int pcap_sendpacket(pcap_t *p, u_char *buf, int size);
 226 int pcap_setmintocopy(pcap_t *p, int size);
 227
 228 #ifdef WPCAP
 229 /* Include file with the wpcap-specific extensions */
 230 #include <Win32-Extensions.h>
 231 #endif
 232
 233 #define MODE_CAPT 0
 234 #define MODE_STAT 1
 235
 236 #endif /* WIN32 */
 237
 238 #ifdef __cplusplus
 239 }
 240 #endif
 241
 242 #endif