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   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/pcap.h,v 1.15 2008-10-06 15:27:32 gianluca Exp $ (LBL)
  35  */
  36
  37 #ifndef lib_pcap_pcap_h
  38 #define lib_pcap_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 #ifndef PCAP_DONT_INCLUDE_PCAP_BPF_H
  51 #include <pcap/bpf.h>
  52 #endif
  53
  54 #include <stdio.h>
  55
  56 #ifdef __cplusplus
  57 extern "C" {
  58 #endif
  59
  60 #define PCAP_VERSION_MAJOR 2
  61 #define PCAP_VERSION_MINOR 4
  62
  63 #define PCAP_ERRBUF_SIZE 256
  64
  65 /*
  66  * Compatibility for systems that have a bpf.h that
  67  * predates the bpf typedefs for 64-bit support.
  68  */
  69 #if BPF_RELEASE - 0 < 199406
  70 typedef int bpf_int32;
  71 typedef u_int bpf_u_int32;
  72 #endif
  73
  74 typedef struct pcap pcap_t;
  75 typedef struct pcap_dumper pcap_dumper_t;
  76 typedef struct pcap_if pcap_if_t;
  77 typedef struct pcap_addr pcap_addr_t;
  78
  79 /*
  80  * The first record in the file contains saved values for some
  81  * of the flags used in the printout phases of tcpdump.
  82  * Many fields here are 32 bit ints so compilers won't insert unwanted
  83  * padding; these files need to be interchangeable across architectures.
  84  *
  85  * Do not change the layout of this structure, in any way (this includes
  86  * changes that only affect the length of fields in this structure).
  87  *
  88  * Also, do not change the interpretation of any of the members of this
  89  * structure, in any way (this includes using values other than
  90  * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
  91  * field).
  92  *
  93  * Instead:
  94  *
  95  *      introduce a new structure for the new format, if the layout
  96  *      of the structure changed;
  97  *
  98  *      send mail to "tcpdump-workers@lists.tcpdump.org", requesting
  99  *      a new magic number for your new capture file format, and, when
 100  *      you get the new magic number, put it in "savefile.c";
 101  *
 102  *      use that magic number for save files with the changed file
 103  *      header;
 104  *
 105  *      make the code in "savefile.c" capable of reading files with
 106  *      the old file header as well as files with the new file header
 107  *      (using the magic number to determine the header format).
 108  *
 109  * Then supply the changes as a patch at
 110  *
 111  *      http://sourceforge.net/projects/libpcap/
 112  *
 113  * so that future versions of libpcap and programs that use it (such as
 114  * tcpdump) will be able to read your new capture file format.
 115  */
 116 struct pcap_file_header {
 117         bpf_u_int32 magic;
 118         u_short version_major;
 119         u_short version_minor;
 120         bpf_int32 thiszone;     /* gmt to local correction */
 121         bpf_u_int32 sigfigs;    /* accuracy of timestamps */
 122         bpf_u_int32 snaplen;    /* max length saved portion of each pkt */
 123         bpf_u_int32 linktype;   /* data link type (LINKTYPE_*) */
 124 };
 125
 126 /*
 127  * Macros for the value returned by pcap_datalink_ext().
 128  *
 129  * If LT_FCS_LENGTH_PRESENT(x) is true, the LT_FCS_LENGTH(x) macro
 130  * gives the FCS length of packets in the capture.
 131  */
 132 #define LT_FCS_LENGTH_PRESENT(x)        ((x) & 0x04000000)
 133 #define LT_FCS_LENGTH(x)                (((x) & 0xF0000000) >> 28)
 134 #define LT_FCS_DATALINK_EXT(x)          ((((x) & 0xF) << 28) | 0x04000000)
 135
 136 typedef enum {
 137        PCAP_D_INOUT = 0,
 138        PCAP_D_IN,
 139        PCAP_D_OUT
 140 } pcap_direction_t;
 141
 142 /*
 143  * Generic per-packet information, as supplied by libpcap.
 144  *
 145  * The time stamp can and should be a "struct timeval", regardless of
 146  * whether your system supports 32-bit tv_sec in "struct timeval",
 147  * 64-bit tv_sec in "struct timeval", or both if it supports both 32-bit
 148  * and 64-bit applications.  The on-disk format of savefiles uses 32-bit
 149  * tv_sec (and tv_usec); this structure is irrelevant to that.  32-bit
 150  * and 64-bit versions of libpcap, even if they're on the same platform,
 151  * should supply the appropriate version of "struct timeval", even if
 152  * that's not what the underlying packet capture mechanism supplies.
 153  */
 154 struct pcap_pkthdr {
 155         struct timeval ts;      /* time stamp */
 156         bpf_u_int32 caplen;     /* length of portion present */
 157         bpf_u_int32 len;        /* length this packet (off wire) */
 158 };
 159
 160 /*
 161  * As returned by the pcap_stats()
 162  */
 163 struct pcap_stat {
 164         u_int ps_recv;          /* number of packets received */
 165         u_int ps_drop;          /* number of packets dropped */
 166         u_int ps_ifdrop;        /* drops by interface -- only supported on some platforms */
 167 #ifdef WIN32
 168         u_int bs_capt;          /* number of packets that reach the application */
 169 #endif /* WIN32 */
 170 };
 171
 172 #ifdef MSDOS
 173 /*
 174  * As returned by the pcap_stats_ex()
 175  */
 176 struct pcap_stat_ex {
 177        u_long  rx_packets;        /* total packets received       */
 178        u_long  tx_packets;        /* total packets transmitted    */
 179        u_long  rx_bytes;          /* total bytes received         */
 180        u_long  tx_bytes;          /* total bytes transmitted      */
 181        u_long  rx_errors;         /* bad packets received         */
 182        u_long  tx_errors;         /* packet transmit problems     */
 183        u_long  rx_dropped;        /* no space in Rx buffers       */
 184        u_long  tx_dropped;        /* no space available for Tx    */
 185        u_long  multicast;         /* multicast packets received   */
 186        u_long  collisions;
 187
 188        /* detailed rx_errors: */
 189        u_long  rx_length_errors;
 190        u_long  rx_over_errors;    /* receiver ring buff overflow  */
 191        u_long  rx_crc_errors;     /* recv'd pkt with crc error    */
 192        u_long  rx_frame_errors;   /* recv'd frame alignment error */
 193        u_long  rx_fifo_errors;    /* recv'r fifo overrun          */
 194        u_long  rx_missed_errors;  /* recv'r missed packet         */
 195
 196        /* detailed tx_errors */
 197        u_long  tx_aborted_errors;
 198        u_long  tx_carrier_errors;
 199        u_long  tx_fifo_errors;
 200        u_long  tx_heartbeat_errors;
 201        u_long  tx_window_errors;
 202      };
 203 #endif
 204
 205 /*
 206  * Item in a list of interfaces.
 207  */
 208 struct pcap_if {
 209         struct pcap_if *next;
 210         char *name;             /* name to hand to "pcap_open_live()" */
 211         char *description;      /* textual description of interface, or NULL */
 212         struct pcap_addr *addresses;
 213         bpf_u_int32 flags;      /* PCAP_IF_ interface flags */
 214 };
 215
 216 #define PCAP_IF_LOOPBACK        0x00000001      /* interface is loopback */
 217
 218 /*
 219  * Representation of an interface address.
 220  */
 221 struct pcap_addr {
 222         struct pcap_addr *next;
 223         struct sockaddr *addr;          /* address */
 224         struct sockaddr *netmask;       /* netmask for that address */
 225         struct sockaddr *broadaddr;     /* broadcast address for that address */
 226         struct sockaddr *dstaddr;       /* P2P destination address for that address */
 227 };
 228
 229 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
 230                              const u_char *);
 231
 232 /*
 233  * Error codes for the pcap API.
 234  * These will all be negative, so you can check for the success or
 235  * failure of a call that returns these codes by checking for a
 236  * negative value.
 237  */
 238 #define PCAP_ERROR                      -1      /* generic error code */
 239 #define PCAP_ERROR_BREAK                -2      /* loop terminated by pcap_breakloop */
 240 #define PCAP_ERROR_NOT_ACTIVATED        -3      /* the capture needs to be activated */
 241 #define PCAP_ERROR_ACTIVATED            -4      /* the operation can't be performed on already activated captures */
 242 #define PCAP_ERROR_NO_SUCH_DEVICE       -5      /* no such device exists */
 243 #define PCAP_ERROR_RFMON_NOTSUP         -6      /* this device doesn't support rfmon (monitor) mode */
 244 #define PCAP_ERROR_NOT_RFMON            -7      /* operation supported only in monitor mode */
 245 #define PCAP_ERROR_PERM_DENIED          -8      /* no permission to open the device */
 246 #define PCAP_ERROR_IFACE_NOT_UP         -9      /* interface isn't up */
 247
 248 /*
 249  * Warning codes for the pcap API.
 250  * These will all be positive and non-zero, so they won't look like
 251  * errors.
 252  */
 253 #define PCAP_WARNING                    1       /* generic warning code */
 254 #define PCAP_WARNING_PROMISC_NOTSUP     2       /* this device doesn't support promiscuous mode */
 255
 256 char    *pcap_lookupdev(char *);
 257 int     pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
 258
 259 pcap_t  *pcap_create(const char *, char *);
 260 int     pcap_set_snaplen(pcap_t *, int);
 261 int     pcap_set_promisc(pcap_t *, int);
 262 int     pcap_can_set_rfmon(pcap_t *);
 263 int     pcap_set_rfmon(pcap_t *, int);
 264 int     pcap_set_timeout(pcap_t *, int);
 265 int     pcap_set_buffer_size(pcap_t *, int);
 266 int     pcap_activate(pcap_t *);
 267
 268 pcap_t  *pcap_open_live(const char *, int, int, int, char *);
 269 pcap_t  *pcap_open_dead(int, int);
 270 pcap_t  *pcap_open_offline(const char *, char *);
 271 #if defined(WIN32)
 272 pcap_t  *pcap_hopen_offline(intptr_t, char *);
 273 #if !defined(LIBPCAP_EXPORTS)
 274 #define pcap_fopen_offline(f,b) \
 275         pcap_hopen_offline(_get_osfhandle(_fileno(f)), b)
 276 #else /*LIBPCAP_EXPORTS*/
 277 static pcap_t *pcap_fopen_offline(FILE *, char *);
 278 #endif
 279 #else /*WIN32*/
 280 pcap_t  *pcap_fopen_offline(FILE *, char *);
 281 #endif /*WIN32*/
 282
 283 void    pcap_close(pcap_t *);
 284 int     pcap_loop(pcap_t *, int, pcap_handler, u_char *);
 285 int     pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
 286 const u_char*
 287         pcap_next(pcap_t *, struct pcap_pkthdr *);
 288 int     pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **);
 289 void    pcap_breakloop(pcap_t *);
 290 int     pcap_stats(pcap_t *, struct pcap_stat *);
 291 int     pcap_setfilter(pcap_t *, struct bpf_program *);
 292 int     pcap_setdirection(pcap_t *, pcap_direction_t);
 293 int     pcap_getnonblock(pcap_t *, char *);
 294 int     pcap_setnonblock(pcap_t *, int, char *);
 295 int     pcap_inject(pcap_t *, const void *, size_t);
 296 int     pcap_sendpacket(pcap_t *, const u_char *, int);
 297 const char *pcap_statustostr(int);
 298 const char *pcap_strerror(int);
 299 char    *pcap_geterr(pcap_t *);
 300 void    pcap_perror(pcap_t *, char *);
 301 int     pcap_compile(pcap_t *, struct bpf_program *, const char *, int,
 302             bpf_u_int32);
 303 int     pcap_compile_nopcap(int, int, struct bpf_program *,
 304             const char *, int, bpf_u_int32);
 305 void    pcap_freecode(struct bpf_program *);
 306 int     pcap_offline_filter(struct bpf_program *, const struct pcap_pkthdr *,
 307             const u_char *);
 308 int     pcap_datalink(pcap_t *);
 309 int     pcap_datalink_ext(pcap_t *);
 310 int     pcap_list_datalinks(pcap_t *, int **);
 311 int     pcap_set_datalink(pcap_t *, int);
 312 void    pcap_free_datalinks(int *);
 313 int     pcap_datalink_name_to_val(const char *);
 314 const char *pcap_datalink_val_to_name(int);
 315 const char *pcap_datalink_val_to_description(int);
 316 int     pcap_snapshot(pcap_t *);
 317 int     pcap_is_swapped(pcap_t *);
 318 int     pcap_major_version(pcap_t *);
 319 int     pcap_minor_version(pcap_t *);
 320
 321 /* XXX */
 322 FILE    *pcap_file(pcap_t *);
 323 int     pcap_fileno(pcap_t *);
 324
 325 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
 326 pcap_dumper_t *pcap_dump_fopen(pcap_t *, FILE *fp);
 327 FILE    *pcap_dump_file(pcap_dumper_t *);
 328 long    pcap_dump_ftell(pcap_dumper_t *);
 329 int     pcap_dump_flush(pcap_dumper_t *);
 330 void    pcap_dump_close(pcap_dumper_t *);
 331 void    pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
 332
 333 int     pcap_findalldevs(pcap_if_t **, char *);
 334 void    pcap_freealldevs(pcap_if_t *);
 335
 336 const char *pcap_lib_version(void);
 337
 338 /* XXX this guy lives in the bpf tree */
 339 u_int   bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int);
 340 int     bpf_validate(const struct bpf_insn *f, int len);
 341 char    *bpf_image(const struct bpf_insn *, int);
 342 void    bpf_dump(const struct bpf_program *, int);
 343
 344 #if defined(WIN32)
 345
 346 /*
 347  * Win32 definitions
 348  */
 349
 350 int pcap_setbuff(pcap_t *p, int dim);
 351 int pcap_setmode(pcap_t *p, int mode);
 352 int pcap_setmintocopy(pcap_t *p, int size);
 353
 354 #ifdef WPCAP
 355 /* Include file with the wpcap-specific extensions */
 356 #include <Win32-Extensions.h>
 357 #endif /* WPCAP */
 358
 359 #define MODE_CAPT 0
 360 #define MODE_STAT 1
 361 #define MODE_MON 2
 362
 363 #elif defined(MSDOS)
 364
 365 /*
 366  * MS-DOS definitions
 367  */
 368
 369 int  pcap_stats_ex (pcap_t *, struct pcap_stat_ex *);
 370 void pcap_set_wait (pcap_t *p, void (*yield)(void), int wait);
 371 u_long pcap_mac_packets (void);
 372
 373 #else /* UN*X */
 374
 375 /*
 376  * UN*X definitions
 377  */
 378
 379 int     pcap_get_selectable_fd(pcap_t *);
 380
 381 #endif /* WIN32/MSDOS/UN*X */
 382
 383 #ifdef __cplusplus
 384 }
 385 #endif
 386
 387 #endif