contrib/libpcap-0.9/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 1.52.2.7 2007/06/11 09:52:05 guy Exp $ (LBL)
  35  */
  36
  37 #ifndef lib_pcap_h
  38 #define lib_pcap_h
  39
  40 #if defined(WIN32)
  41   #include <pcap-stdinc.h>
  42 #elif defined(MSDOS)
  43   #include <sys/types.h>
  44   #include <sys/socket.h>  /* u_int, u_char etc. */
  45 #else /* UN*X */
  46   #include <sys/types.h>
  47   #include <sys/time.h>
  48 #endif /* WIN32/MSDOS/UN*X */
  49
  50 #include <net/bpf.h>
  51
  52 #include <stdio.h>
  53
  54 #ifdef __cplusplus
  55 extern "C" {
  56 #endif
  57
  58 #define PCAP_VERSION_MAJOR 2
  59 #define PCAP_VERSION_MINOR 4
  60
  61 #define PCAP_ERRBUF_SIZE 256
  62
  63 /*
  64  * Compatibility for systems that have a bpf.h that
  65  * predates the bpf typedefs for 64-bit support.
  66  */
  67 #if BPF_RELEASE - 0 < 199406
  68 typedef int bpf_int32;
  69 typedef u_int bpf_u_int32;
  70 #endif
  71
  72 typedef struct pcap pcap_t;
  73 typedef struct pcap_dumper pcap_dumper_t;
  74 typedef struct pcap_if pcap_if_t;
  75 typedef struct pcap_addr pcap_addr_t;
  76
  77 /*
  78  * The first record in the file contains saved values for some
  79  * of the flags used in the printout phases of tcpdump.
  80  * Many fields here are 32 bit ints so compilers won't insert unwanted
  81  * padding; these files need to be interchangeable across architectures.
  82  *
  83  * Do not change the layout of this structure, in any way (this includes
  84  * changes that only affect the length of fields in this structure).
  85  *
  86  * Also, do not change the interpretation of any of the members of this
  87  * structure, in any way (this includes using values other than
  88  * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
  89  * field).
  90  *
  91  * Instead:
  92  *
  93  *      introduce a new structure for the new format, if the layout
  94  *      of the structure changed;
  95  *
  96  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
  97  *      magic number for your new capture file format, and, when
  98  *      you get the new magic number, put it in "savefile.c";
  99  *
 100  *      use that magic number for save files with the changed file
 101  *      header;
 102  *
 103  *      make the code in "savefile.c" capable of reading files with
 104  *      the old file header as well as files with the new file header
 105  *      (using the magic number to determine the header format).
 106  *
 107  * Then supply the changes to "patches@tcpdump.org", so that future
 108  * versions of libpcap and programs that use it (such as tcpdump) will
 109  * be able to read your new capture file format.
 110  */
 111 struct pcap_file_header {
 112         bpf_u_int32 magic;
 113         u_short version_major;
 114         u_short version_minor;
 115         bpf_int32 thiszone;     /* gmt to local correction */
 116         bpf_u_int32 sigfigs;    /* accuracy of timestamps */
 117         bpf_u_int32 snaplen;    /* max length saved portion of each pkt */
 118         bpf_u_int32 linktype;   /* data link type (LINKTYPE_*) */
 119 };
 120
 121 typedef enum {
 122        PCAP_D_INOUT = 0,
 123        PCAP_D_IN,
 124        PCAP_D_OUT
 125 } pcap_direction_t;
 126
 127 /*
 128  * Generic per-packet information, as supplied by libpcap.
 129  *
 130  * The time stamp can and should be a "struct timeval", regardless of
 131  * whether your system supports 32-bit tv_sec in "struct timeval",
 132  * 64-bit tv_sec in "struct timeval", or both if it supports both 32-bit
 133  * and 64-bit applications.  The on-disk format of savefiles uses 32-bit
 134  * tv_sec (and tv_usec); this structure is irrelevant to that.  32-bit
 135  * and 64-bit versions of libpcap, even if they're on the same platform,
 136  * should supply the appropriate version of "struct timeval", even if
 137  * that's not what the underlying packet capture mechanism supplies.
 138  */
 139 struct pcap_pkthdr {
 140         struct timeval ts;      /* time stamp */
 141         bpf_u_int32 caplen;     /* length of portion present */
 142         bpf_u_int32 len;        /* length this packet (off wire) */
 143 };
 144
 145 /*
 146  * As returned by the pcap_stats()
 147  */
 148 struct pcap_stat {
 149         u_int ps_recv;          /* number of packets received */
 150         u_int ps_drop;          /* number of packets dropped */
 151         u_int ps_ifdrop;        /* drops by interface XXX not yet supported */
 152 #ifdef WIN32
 153         u_int bs_capt;          /* number of packets that reach the application */
 154 #endif /* WIN32 */
 155 };
 156
 157 #ifdef MSDOS
 158 /*
 159  * As returned by the pcap_stats_ex()
 160  */
 161 struct pcap_stat_ex {
 162        u_long  rx_packets;        /* total packets received       */
 163        u_long  tx_packets;        /* total packets transmitted    */
 164        u_long  rx_bytes;          /* total bytes received         */
 165        u_long  tx_bytes;          /* total bytes transmitted      */
 166        u_long  rx_errors;         /* bad packets received         */
 167        u_long  tx_errors;         /* packet transmit problems     */
 168        u_long  rx_dropped;        /* no space in Rx buffers       */
 169        u_long  tx_dropped;        /* no space available for Tx    */
 170        u_long  multicast;         /* multicast packets received   */
 171        u_long  collisions;
 172
 173        /* detailed rx_errors: */
 174        u_long  rx_length_errors;
 175        u_long  rx_over_errors;    /* receiver ring buff overflow  */
 176        u_long  rx_crc_errors;     /* recv'd pkt with crc error    */
 177        u_long  rx_frame_errors;   /* recv'd frame alignment error */
 178        u_long  rx_fifo_errors;    /* recv'r fifo overrun          */
 179        u_long  rx_missed_errors;  /* recv'r missed packet         */
 180
 181        /* detailed tx_errors */
 182        u_long  tx_aborted_errors;
 183        u_long  tx_carrier_errors;
 184        u_long  tx_fifo_errors;
 185        u_long  tx_heartbeat_errors;
 186        u_long  tx_window_errors;
 187      };
 188 #endif
 189
 190 /*
 191  * Item in a list of interfaces.
 192  */
 193 struct pcap_if {
 194         struct pcap_if *next;
 195         char *name;             /* name to hand to "pcap_open_live()" */
 196         char *description;      /* textual description of interface, or NULL */
 197         struct pcap_addr *addresses;
 198         bpf_u_int32 flags;      /* PCAP_IF_ interface flags */
 199 };
 200
 201 #define PCAP_IF_LOOPBACK        0x00000001      /* interface is loopback */
 202
 203 /*
 204  * Representation of an interface address.
 205  */
 206 struct pcap_addr {
 207         struct pcap_addr *next;
 208         struct sockaddr *addr;          /* address */
 209         struct sockaddr *netmask;       /* netmask for that address */
 210         struct sockaddr *broadaddr;     /* broadcast address for that address */
 211         struct sockaddr *dstaddr;       /* P2P destination address for that address */
 212 };
 213
 214 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
 215                              const u_char *);
 216
 217 char    *pcap_lookupdev(char *);
 218 int     pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
 219 pcap_t  *pcap_open_live(const char *, int, int, int, char *);
 220 pcap_t  *pcap_open_dead(int, int);
 221 pcap_t  *pcap_open_offline(const char *, char *);
 222 pcap_t  *pcap_fopen_offline(FILE *, char *);
 223 void    pcap_close(pcap_t *);
 224 int     pcap_loop(pcap_t *, int, pcap_handler, u_char *);
 225 int     pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
 226 const u_char*
 227         pcap_next(pcap_t *, struct pcap_pkthdr *);
 228 int     pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **);
 229 void    pcap_breakloop(pcap_t *);
 230 int     pcap_stats(pcap_t *, struct pcap_stat *);
 231 int     pcap_setfilter(pcap_t *, struct bpf_program *);
 232 int     pcap_setdirection(pcap_t *, pcap_direction_t);
 233 int     pcap_getnonblock(pcap_t *, char *);
 234 int     pcap_setnonblock(pcap_t *, int, char *);
 235 void    pcap_perror(pcap_t *, char *);
 236 int     pcap_inject(pcap_t *, const void *, size_t);
 237 int     pcap_sendpacket(pcap_t *, const u_char *, int);
 238 const char *pcap_strerror(int);
 239 char    *pcap_geterr(pcap_t *);
 240 int     pcap_compile(pcap_t *, struct bpf_program *, const char *, int,
 241             bpf_u_int32);
 242 int     pcap_compile_nopcap(int, int, struct bpf_program *,
 243             const char *, int, bpf_u_int32);
 244 void    pcap_freecode(struct bpf_program *);
 245 int     pcap_datalink(pcap_t *);
 246 int     pcap_list_datalinks(pcap_t *, int **);
 247 int     pcap_set_datalink(pcap_t *, int);
 248 int     pcap_datalink_name_to_val(const char *);
 249 const char *pcap_datalink_val_to_name(int);
 250 const char *pcap_datalink_val_to_description(int);
 251 int     pcap_snapshot(pcap_t *);
 252 int     pcap_is_swapped(pcap_t *);
 253 int     pcap_major_version(pcap_t *);
 254 int     pcap_minor_version(pcap_t *);
 255
 256 /* XXX */
 257 FILE    *pcap_file(pcap_t *);
 258 int     pcap_fileno(pcap_t *);
 259
 260 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
 261 pcap_dumper_t *pcap_dump_fopen(pcap_t *, FILE *fp);
 262 FILE    *pcap_dump_file(pcap_dumper_t *);
 263 long    pcap_dump_ftell(pcap_dumper_t *);
 264 int     pcap_dump_flush(pcap_dumper_t *);
 265 void    pcap_dump_close(pcap_dumper_t *);
 266 void    pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
 267
 268 int     pcap_findalldevs(pcap_if_t **, char *);
 269 void    pcap_freealldevs(pcap_if_t *);
 270
 271 const char *pcap_lib_version(void);
 272
 273 /* XXX this guy lives in the bpf tree */
 274 u_int   bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
 275 int     bpf_validate(struct bpf_insn *f, int len);
 276 char    *bpf_image(struct bpf_insn *, int);
 277 void    bpf_dump(struct bpf_program *, int);
 278
 279 #if defined(WIN32)
 280
 281 /*
 282  * Win32 definitions
 283  */
 284
 285 int pcap_setbuff(pcap_t *p, int dim);
 286 int pcap_setmode(pcap_t *p, int mode);
 287 int pcap_setmintocopy(pcap_t *p, int size);
 288
 289 #ifdef WPCAP
 290 /* Include file with the wpcap-specific extensions */
 291 #include <Win32-Extensions.h>
 292 #endif /* WPCAP */
 293
 294 #define MODE_CAPT 0
 295 #define MODE_STAT 1
 296 #define MODE_MON 2
 297
 298 #elif defined(MSDOS)
 299
 300 /*
 301  * MS-DOS definitions
 302  */
 303
 304 int  pcap_stats_ex (pcap_t *, struct pcap_stat_ex *);
 305 void pcap_set_wait (pcap_t *p, void (*yield)(void), int wait);
 306 u_long pcap_mac_packets (void);
 307
 308 #else /* UN*X */
 309
 310 /*
 311  * UN*X definitions
 312  */
 313
 314 int     pcap_get_selectable_fd(pcap_t *);
 315
 316 #endif /* WIN32/MSDOS/UN*X */
 317
 318 #ifdef __cplusplus
 319 }
 320 #endif
 321
 322 #endif