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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 /*
  61  * Version number of the current version of the pcap file format.
  62  *
  63  * NOTE: this is *NOT* the version number of the libpcap library.
  64  * To fetch the version information for the version of libpcap
  65  * you're using, use pcap_lib_version().
  66  */
  67 #define PCAP_VERSION_MAJOR 2
  68 #define PCAP_VERSION_MINOR 4
  69
  70 #define PCAP_ERRBUF_SIZE 256
  71
  72 /*
  73  * Compatibility for systems that have a bpf.h that
  74  * predates the bpf typedefs for 64-bit support.
  75  */
  76 #if BPF_RELEASE - 0 < 199406
  77 typedef int bpf_int32;
  78 typedef u_int bpf_u_int32;
  79 #endif
  80
  81 typedef struct pcap pcap_t;
  82 typedef struct pcap_dumper pcap_dumper_t;
  83 typedef struct pcap_if pcap_if_t;
  84 typedef struct pcap_addr pcap_addr_t;
  85
  86 /*
  87  * The first record in the file contains saved values for some
  88  * of the flags used in the printout phases of tcpdump.
  89  * Many fields here are 32 bit ints so compilers won't insert unwanted
  90  * padding; these files need to be interchangeable across architectures.
  91  *
  92  * Do not change the layout of this structure, in any way (this includes
  93  * changes that only affect the length of fields in this structure).
  94  *
  95  * Also, do not change the interpretation of any of the members of this
  96  * structure, in any way (this includes using values other than
  97  * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
  98  * field).
  99  *
 100  * Instead:
 101  *
 102  *      introduce a new structure for the new format, if the layout
 103  *      of the structure changed;
 104  *
 105  *      send mail to "tcpdump-workers@lists.tcpdump.org", requesting
 106  *      a new magic number for your new capture file format, and, when
 107  *      you get the new magic number, put it in "savefile.c";
 108  *
 109  *      use that magic number for save files with the changed file
 110  *      header;
 111  *
 112  *      make the code in "savefile.c" capable of reading files with
 113  *      the old file header as well as files with the new file header
 114  *      (using the magic number to determine the header format).
 115  *
 116  * Then supply the changes as a patch at
 117  *
 118  *      http://sourceforge.net/projects/libpcap/
 119  *
 120  * so that future versions of libpcap and programs that use it (such as
 121  * tcpdump) will be able to read your new capture file format.
 122  */
 123 struct pcap_file_header {
 124         bpf_u_int32 magic;
 125         u_short version_major;
 126         u_short version_minor;
 127         bpf_int32 thiszone;     /* gmt to local correction */
 128         bpf_u_int32 sigfigs;    /* accuracy of timestamps */
 129         bpf_u_int32 snaplen;    /* max length saved portion of each pkt */
 130         bpf_u_int32 linktype;   /* data link type (LINKTYPE_*) */
 131 };
 132
 133 /*
 134  * Macros for the value returned by pcap_datalink_ext().
 135  *
 136  * If LT_FCS_LENGTH_PRESENT(x) is true, the LT_FCS_LENGTH(x) macro
 137  * gives the FCS length of packets in the capture.
 138  */
 139 #define LT_FCS_LENGTH_PRESENT(x)        ((x) & 0x04000000)
 140 #define LT_FCS_LENGTH(x)                (((x) & 0xF0000000) >> 28)
 141 #define LT_FCS_DATALINK_EXT(x)          ((((x) & 0xF) << 28) | 0x04000000)
 142
 143 typedef enum {
 144        PCAP_D_INOUT = 0,
 145        PCAP_D_IN,
 146        PCAP_D_OUT
 147 } pcap_direction_t;
 148
 149 /*
 150  * Generic per-packet information, as supplied by libpcap.
 151  *
 152  * The time stamp can and should be a "struct timeval", regardless of
 153  * whether your system supports 32-bit tv_sec in "struct timeval",
 154  * 64-bit tv_sec in "struct timeval", or both if it supports both 32-bit
 155  * and 64-bit applications.  The on-disk format of savefiles uses 32-bit
 156  * tv_sec (and tv_usec); this structure is irrelevant to that.  32-bit
 157  * and 64-bit versions of libpcap, even if they're on the same platform,
 158  * should supply the appropriate version of "struct timeval", even if
 159  * that's not what the underlying packet capture mechanism supplies.
 160  */
 161 struct pcap_pkthdr {
 162         struct timeval ts;      /* time stamp */
 163         bpf_u_int32 caplen;     /* length of portion present */
 164         bpf_u_int32 len;        /* length this packet (off wire) */
 165 };
 166
 167 /*
 168  * As returned by the pcap_stats()
 169  */
 170 struct pcap_stat {
 171         u_int ps_recv;          /* number of packets received */
 172         u_int ps_drop;          /* number of packets dropped */
 173         u_int ps_ifdrop;        /* drops by interface -- only supported on some platforms */
 174 #ifdef WIN32
 175         u_int bs_capt;          /* number of packets that reach the application */
 176 #endif /* WIN32 */
 177 };
 178
 179 #ifdef MSDOS
 180 /*
 181  * As returned by the pcap_stats_ex()
 182  */
 183 struct pcap_stat_ex {
 184        u_long  rx_packets;        /* total packets received       */
 185        u_long  tx_packets;        /* total packets transmitted    */
 186        u_long  rx_bytes;          /* total bytes received         */
 187        u_long  tx_bytes;          /* total bytes transmitted      */
 188        u_long  rx_errors;         /* bad packets received         */
 189        u_long  tx_errors;         /* packet transmit problems     */
 190        u_long  rx_dropped;        /* no space in Rx buffers       */
 191        u_long  tx_dropped;        /* no space available for Tx    */
 192        u_long  multicast;         /* multicast packets received   */
 193        u_long  collisions;
 194
 195        /* detailed rx_errors: */
 196        u_long  rx_length_errors;
 197        u_long  rx_over_errors;    /* receiver ring buff overflow  */
 198        u_long  rx_crc_errors;     /* recv'd pkt with crc error    */
 199        u_long  rx_frame_errors;   /* recv'd frame alignment error */
 200        u_long  rx_fifo_errors;    /* recv'r fifo overrun          */
 201        u_long  rx_missed_errors;  /* recv'r missed packet         */
 202
 203        /* detailed tx_errors */
 204        u_long  tx_aborted_errors;
 205        u_long  tx_carrier_errors;
 206        u_long  tx_fifo_errors;
 207        u_long  tx_heartbeat_errors;
 208        u_long  tx_window_errors;
 209      };
 210 #endif
 211
 212 /*
 213  * Item in a list of interfaces.
 214  */
 215 struct pcap_if {
 216         struct pcap_if *next;
 217         char *name;             /* name to hand to "pcap_open_live()" */
 218         char *description;      /* textual description of interface, or NULL */
 219         struct pcap_addr *addresses;
 220         bpf_u_int32 flags;      /* PCAP_IF_ interface flags */
 221 };
 222
 223 #define PCAP_IF_LOOPBACK        0x00000001      /* interface is loopback */
 224
 225 /*
 226  * Representation of an interface address.
 227  */
 228 struct pcap_addr {
 229         struct pcap_addr *next;
 230         struct sockaddr *addr;          /* address */
 231         struct sockaddr *netmask;       /* netmask for that address */
 232         struct sockaddr *broadaddr;     /* broadcast address for that address */
 233         struct sockaddr *dstaddr;       /* P2P destination address for that address */
 234 };
 235
 236 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
 237                              const u_char *);
 238
 239 /*
 240  * Error codes for the pcap API.
 241  * These will all be negative, so you can check for the success or
 242  * failure of a call that returns these codes by checking for a
 243  * negative value.
 244  */
 245 #define PCAP_ERROR                      -1      /* generic error code */
 246 #define PCAP_ERROR_BREAK                -2      /* loop terminated by pcap_breakloop */
 247 #define PCAP_ERROR_NOT_ACTIVATED        -3      /* the capture needs to be activated */
 248 #define PCAP_ERROR_ACTIVATED            -4      /* the operation can't be performed on already activated captures */
 249 #define PCAP_ERROR_NO_SUCH_DEVICE       -5      /* no such device exists */
 250 #define PCAP_ERROR_RFMON_NOTSUP         -6      /* this device doesn't support rfmon (monitor) mode */
 251 #define PCAP_ERROR_NOT_RFMON            -7      /* operation supported only in monitor mode */
 252 #define PCAP_ERROR_PERM_DENIED          -8      /* no permission to open the device */
 253 #define PCAP_ERROR_IFACE_NOT_UP         -9      /* interface isn't up */
 254 #define PCAP_ERROR_CANTSET_TSTAMP_TYPE  -10     /* this device doesn't support setting the time stamp type */
 255
 256 /*
 257  * Warning codes for the pcap API.
 258  * These will all be positive and non-zero, so they won't look like
 259  * errors.
 260  */
 261 #define PCAP_WARNING                    1       /* generic warning code */
 262 #define PCAP_WARNING_PROMISC_NOTSUP     2       /* this device doesn't support promiscuous mode */
 263 #define PCAP_WARNING_TSTAMP_TYPE_NOTSUP 3       /* the requested time stamp type is not supported */
 264
 265 /*
 266  * Value to pass to pcap_compile() as the netmask if you don't know what
 267  * the netmask is.
 268  */
 269 #define PCAP_NETMASK_UNKNOWN    0xffffffff
 270
 271 char    *pcap_lookupdev(char *);
 272 int     pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
 273
 274 pcap_t  *pcap_create(const char *, char *);
 275 int     pcap_set_snaplen(pcap_t *, int);
 276 int     pcap_set_promisc(pcap_t *, int);
 277 int     pcap_can_set_rfmon(pcap_t *);
 278 int     pcap_set_rfmon(pcap_t *, int);
 279 int     pcap_set_timeout(pcap_t *, int);
 280 int     pcap_set_tstamp_type(pcap_t *, int);
 281 int     pcap_set_buffer_size(pcap_t *, int);
 282 int     pcap_activate(pcap_t *);
 283
 284 int     pcap_list_tstamp_types(pcap_t *, int **);
 285 void    pcap_free_tstamp_types(int *);
 286 int     pcap_tstamp_type_name_to_val(const char *);
 287 const char *pcap_tstamp_type_val_to_name(int);
 288 const char *pcap_tstamp_type_val_to_description(int);
 289
 290 /*
 291  * Time stamp types.
 292  * Not all systems and interfaces will necessarily support all of these.
 293  *
 294  * A system that supports PCAP_TSTAMP_HOST is offering time stamps
 295  * provided by the host machine, rather than by the capture device,
 296  * but not committing to any characteristics of the time stamp;
 297  * it will not offer any of the PCAP_TSTAMP_HOST_ subtypes.
 298  *
 299  * PCAP_TSTAMP_HOST_LOWPREC is a time stamp, provided by the host machine,
 300  * that's low-precision but relatively cheap to fetch; it's normally done
 301  * using the system clock, so it's normally synchronized with times you'd
 302  * fetch from system calls.
 303  *
 304  * PCAP_TSTAMP_HOST_HIPREC is a time stamp, provided by the host machine,
 305  * that's high-precision; it might be more expensive to fetch.  It might
 306  * or might not be synchronized with the system clock, and might have
 307  * problems with time stamps for packets received on different CPUs,
 308  * depending on the platform.
 309  *
 310  * PCAP_TSTAMP_ADAPTER is a high-precision time stamp supplied by the
 311  * capture device; it's synchronized with the system clock.
 312  *
 313  * PCAP_TSTAMP_ADAPTER_UNSYNC is a high-precision time stamp supplied by
 314  * the capture device; it's not synchronized with the system clock.
 315  *
 316  * Note that time stamps synchronized with the system clock can go
 317  * backwards, as the system clock can go backwards.  If a clock is
 318  * not in sync with the system clock, that could be because the
 319  * system clock isn't keeping accurate time, because the other
 320  * clock isn't keeping accurate time, or both.
 321  *
 322  * Note that host-provided time stamps generally correspond to the
 323  * time when the time-stamping code sees the packet; this could
 324  * be some unknown amount of time after the first or last bit of
 325  * the packet is received by the network adapter, due to batching
 326  * of interrupts for packet arrival, queueing delays, etc..
 327  */
 328 #define PCAP_TSTAMP_HOST                0       /* host-provided, unknown characteristics */
 329 #define PCAP_TSTAMP_HOST_LOWPREC        1       /* host-provided, low precision */
 330 #define PCAP_TSTAMP_HOST_HIPREC         2       /* host-provided, high precision */
 331 #define PCAP_TSTAMP_ADAPTER             3       /* device-provided, synced with the system clock */
 332 #define PCAP_TSTAMP_ADAPTER_UNSYNCED    4       /* device-provided, not synced with the system clock */
 333
 334 pcap_t  *pcap_open_live(const char *, int, int, int, char *);
 335 pcap_t  *pcap_open_dead(int, int);
 336 pcap_t  *pcap_open_offline(const char *, char *);
 337 #if defined(WIN32)
 338 pcap_t  *pcap_hopen_offline(intptr_t, char *);
 339 #if !defined(LIBPCAP_EXPORTS)
 340 #define pcap_fopen_offline(f,b) \
 341         pcap_hopen_offline(_get_osfhandle(_fileno(f)), b)
 342 #else /*LIBPCAP_EXPORTS*/
 343 static pcap_t *pcap_fopen_offline(FILE *, char *);
 344 #endif
 345 #else /*WIN32*/
 346 pcap_t  *pcap_fopen_offline(FILE *, char *);
 347 #endif /*WIN32*/
 348
 349 void    pcap_close(pcap_t *);
 350 int     pcap_loop(pcap_t *, int, pcap_handler, u_char *);
 351 int     pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
 352 const u_char*
 353         pcap_next(pcap_t *, struct pcap_pkthdr *);
 354 int     pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **);
 355 void    pcap_breakloop(pcap_t *);
 356 int     pcap_stats(pcap_t *, struct pcap_stat *);
 357 int     pcap_setfilter(pcap_t *, struct bpf_program *);
 358 int     pcap_setdirection(pcap_t *, pcap_direction_t);
 359 int     pcap_getnonblock(pcap_t *, char *);
 360 int     pcap_setnonblock(pcap_t *, int, char *);
 361 int     pcap_inject(pcap_t *, const void *, size_t);
 362 int     pcap_sendpacket(pcap_t *, const u_char *, int);
 363 const char *pcap_statustostr(int);
 364 const char *pcap_strerror(int);
 365 char    *pcap_geterr(pcap_t *);
 366 void    pcap_perror(pcap_t *, char *);
 367 int     pcap_compile(pcap_t *, struct bpf_program *, const char *, int,
 368             bpf_u_int32);
 369 int     pcap_compile_nopcap(int, int, struct bpf_program *,
 370             const char *, int, bpf_u_int32);
 371 void    pcap_freecode(struct bpf_program *);
 372 int     pcap_offline_filter(struct bpf_program *, const struct pcap_pkthdr *,
 373             const u_char *);
 374 int     pcap_datalink(pcap_t *);
 375 int     pcap_datalink_ext(pcap_t *);
 376 int     pcap_list_datalinks(pcap_t *, int **);
 377 int     pcap_set_datalink(pcap_t *, int);
 378 void    pcap_free_datalinks(int *);
 379 int     pcap_datalink_name_to_val(const char *);
 380 const char *pcap_datalink_val_to_name(int);
 381 const char *pcap_datalink_val_to_description(int);
 382 int     pcap_snapshot(pcap_t *);
 383 int     pcap_is_swapped(pcap_t *);
 384 int     pcap_major_version(pcap_t *);
 385 int     pcap_minor_version(pcap_t *);
 386
 387 /* XXX */
 388 FILE    *pcap_file(pcap_t *);
 389 int     pcap_fileno(pcap_t *);
 390
 391 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
 392 pcap_dumper_t *pcap_dump_fopen(pcap_t *, FILE *fp);
 393 FILE    *pcap_dump_file(pcap_dumper_t *);
 394 long    pcap_dump_ftell(pcap_dumper_t *);
 395 int     pcap_dump_flush(pcap_dumper_t *);
 396 void    pcap_dump_close(pcap_dumper_t *);
 397 void    pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
 398
 399 int     pcap_findalldevs(pcap_if_t **, char *);
 400 void    pcap_freealldevs(pcap_if_t *);
 401
 402 const char *pcap_lib_version(void);
 403
 404 /* XXX this guy lives in the bpf tree */
 405 u_int   bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int);
 406 int     bpf_validate(const struct bpf_insn *f, int len);
 407 char    *bpf_image(const struct bpf_insn *, int);
 408 void    bpf_dump(const struct bpf_program *, int);
 409
 410 #if defined(WIN32)
 411
 412 /*
 413  * Win32 definitions
 414  */
 415
 416 int pcap_setbuff(pcap_t *p, int dim);
 417 int pcap_setmode(pcap_t *p, int mode);
 418 int pcap_setmintocopy(pcap_t *p, int size);
 419
 420 #ifdef WPCAP
 421 /* Include file with the wpcap-specific extensions */
 422 #include <Win32-Extensions.h>
 423 #endif /* WPCAP */
 424
 425 #define MODE_CAPT 0
 426 #define MODE_STAT 1
 427 #define MODE_MON 2
 428
 429 #elif defined(MSDOS)
 430
 431 /*
 432  * MS-DOS definitions
 433  */
 434
 435 int  pcap_stats_ex (pcap_t *, struct pcap_stat_ex *);
 436 void pcap_set_wait (pcap_t *p, void (*yield)(void), int wait);
 437 u_long pcap_mac_packets (void);
 438
 439 #else /* UN*X */
 440
 441 /*
 442  * UN*X definitions
 443  */
 444
 445 int     pcap_get_selectable_fd(pcap_t *);
 446
 447 #endif /* WIN32/MSDOS/UN*X */
 448
 449 #ifdef __cplusplus
 450 }
 451 #endif
 452
 453 #endif