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

   1 /*
   2  * Copyright (c) 1994, 1995, 1996
   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-int.h,v 1.94 2008-09-16 00:20:23 guy Exp $ (LBL)
  34  */
  35
  36 #ifndef pcap_int_h
  37 #define pcap_int_h
  38
  39 #include <pcap/pcap.h>
  40
  41 #ifdef __cplusplus
  42 extern "C" {
  43 #endif
  44
  45 #ifdef HAVE_LIBDLPI
  46 #include <libdlpi.h>
  47 #endif
  48
  49 #ifdef WIN32
  50 #include <Packet32.h>
  51 extern CRITICAL_SECTION g_PcapCompileCriticalSection;
  52 #endif /* WIN32 */
  53
  54 #ifdef MSDOS
  55 #include <fcntl.h>
  56 #include <io.h>
  57 #endif
  58
  59 #ifdef HAVE_SNF_API
  60 #include <snf.h>
  61 #endif
  62
  63 #if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/
  64
  65 /*
  66  * Swap byte ordering of unsigned long long timestamp on a big endian
  67  * machine.
  68  */
  69 #define SWAPLL(ull)  ((ull & 0xff00000000000000) >> 56) | \
  70                       ((ull & 0x00ff000000000000) >> 40) | \
  71                       ((ull & 0x0000ff0000000000) >> 24) | \
  72                       ((ull & 0x000000ff00000000) >> 8)  | \
  73                       ((ull & 0x00000000ff000000) << 8)  | \
  74                       ((ull & 0x0000000000ff0000) << 24) | \
  75                       ((ull & 0x000000000000ff00) << 40) | \
  76                       ((ull & 0x00000000000000ff) << 56)
  77
  78 #else /* A recent Visual studio compiler or not VC */
  79
  80 /*
  81  * Swap byte ordering of unsigned long long timestamp on a big endian
  82  * machine.
  83  */
  84 #define SWAPLL(ull)  ((ull & 0xff00000000000000LL) >> 56) | \
  85                       ((ull & 0x00ff000000000000LL) >> 40) | \
  86                       ((ull & 0x0000ff0000000000LL) >> 24) | \
  87                       ((ull & 0x000000ff00000000LL) >> 8)  | \
  88                       ((ull & 0x00000000ff000000LL) << 8)  | \
  89                       ((ull & 0x0000000000ff0000LL) << 24) | \
  90                       ((ull & 0x000000000000ff00LL) << 40) | \
  91                       ((ull & 0x00000000000000ffLL) << 56)
  92
  93 #endif /* _MSC_VER */
  94
  95 /*
  96  * Savefile
  97  */
  98 typedef enum {
  99         NOT_SWAPPED,
 100         SWAPPED,
 101         MAYBE_SWAPPED
 102 } swapped_type_t;
 103
 104 /*
 105  * Used when reading a savefile.
 106  */
 107 struct pcap_sf {
 108         FILE *rfile;
 109         int (*next_packet_op)(pcap_t *, struct pcap_pkthdr *, u_char **);
 110         int swapped;
 111         size_t hdrsize;
 112         swapped_type_t lengths_swapped;
 113         int version_major;
 114         int version_minor;
 115         bpf_u_int32 ifcount;    /* number of interfaces seen in this capture */
 116         u_int tsresol;          /* time stamp resolution */
 117         u_int tsscale;          /* scaling factor for resolution -> microseconds */
 118         u_int64_t tsoffset;     /* time stamp offset */
 119 };
 120
 121 /*
 122  * Used when doing a live capture.
 123  */
 124 struct pcap_md {
 125         struct pcap_stat stat;
 126         /*XXX*/
 127         int use_bpf;            /* using kernel filter */
 128         u_long  TotPkts;        /* can't oflow for 79 hrs on ether */
 129         u_long  TotAccepted;    /* count accepted by filter */
 130         u_long  TotDrops;       /* count of dropped packets */
 131         long    TotMissed;      /* missed by i/f during this run */
 132         long    OrigMissed;     /* missed by i/f before this run */
 133         char    *device;        /* device name */
 134         int     timeout;        /* timeout for buffering */
 135         int     must_do_on_close; /* stuff we must do when we close */
 136         struct pcap *next;      /* list of open pcaps that need stuff cleared on close */
 137 #if defined(linux) || defined(PCAP_SUPPORT_DBUS)
 138         u_int   packets_read;   /* count of packets read with recvfrom() */
 139 #endif
 140 #ifdef linux
 141         int     sock_packet;    /* using Linux 2.0 compatible interface */
 142         int     cooked;         /* using SOCK_DGRAM rather than SOCK_RAW */
 143         int     ifindex;        /* interface index of device we're bound to */
 144         int     lo_ifindex;     /* interface index of the loopback device */
 145         bpf_u_int32 oldmode;    /* mode to restore when turning monitor mode off */
 146         char    *mondevice;     /* mac80211 monitor device we created */
 147         u_char  *mmapbuf;       /* memory-mapped region pointer */
 148         size_t  mmapbuflen;     /* size of region */
 149         int     vlan_offset;    /* offset at which to insert vlan tags; if -1, don't insert */
 150         u_int   tp_version;     /* version of tpacket_hdr for mmaped ring */
 151         u_int   tp_hdrlen;      /* hdrlen of tpacket_hdr for mmaped ring */
 152         u_char  *oneshot_buffer; /* buffer for copy of packet */
 153         long    proc_dropped; /* packets reported dropped by /proc/net/dev */
 154 #endif /* linux */
 155
 156 #ifdef HAVE_DAG_API
 157 #ifdef HAVE_DAG_STREAMS_API
 158         u_char  *dag_mem_bottom;        /* DAG card current memory bottom pointer */
 159         u_char  *dag_mem_top;   /* DAG card current memory top pointer */
 160 #else /* HAVE_DAG_STREAMS_API */
 161         void    *dag_mem_base;  /* DAG card memory base address */
 162         u_int   dag_mem_bottom; /* DAG card current memory bottom offset */
 163         u_int   dag_mem_top;    /* DAG card current memory top offset */
 164 #endif /* HAVE_DAG_STREAMS_API */
 165         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
 166         int     dag_offset_flags; /* Flags to pass to dag_offset(). */
 167         int     dag_stream;     /* DAG stream number */
 168         int     dag_timeout;    /* timeout specified to pcap_open_live.
 169                                  * Same as in linux above, introduce
 170                                  * generally? */
 171 #endif /* HAVE_DAG_API */
 172 #ifdef HAVE_SNF_API
 173         snf_handle_t snf_handle; /* opaque device handle */
 174         snf_ring_t   snf_ring;   /* opaque device ring handle */
 175         int          snf_timeout;
 176         int          snf_boardnum;
 177 #endif /*HAVE_SNF_API*/
 178
 179 #ifdef HAVE_ZEROCOPY_BPF
 180        /*
 181         * Zero-copy read buffer -- for zero-copy BPF.  'buffer' above will
 182         * alternative between these two actual mmap'd buffers as required.
 183         * As there is a header on the front size of the mmap'd buffer, only
 184         * some of the buffer is exposed to libpcap as a whole via bufsize;
 185         * zbufsize is the true size.  zbuffer tracks the current zbuf
 186         * assocated with buffer so that it can be used to decide which the
 187         * next buffer to read will be.
 188         */
 189        u_char *zbuf1, *zbuf2, *zbuffer;
 190        u_int zbufsize;
 191        u_int zerocopy;
 192        u_int interrupted;
 193        struct timespec firstsel;
 194        /*
 195         * If there's currently a buffer being actively processed, then it is
 196         * referenced here; 'buffer' is also pointed at it, but offset by the
 197         * size of the header.
 198         */
 199        struct bpf_zbuf_header *bzh;
 200 #endif /* HAVE_ZEROCOPY_BPF */
 201
 202        void *priv;
 203 };
 204
 205 /*
 206  * Stuff to do when we close.
 207  */
 208 #define MUST_CLEAR_PROMISC      0x00000001      /* clear promiscuous mode */
 209 #define MUST_CLEAR_RFMON        0x00000002      /* clear rfmon (monitor) mode */
 210 #define MUST_DELETE_MONIF       0x00000004      /* delete monitor-mode interface */
 211
 212 struct pcap_opt {
 213         int     buffer_size;
 214         char    *source;
 215         int     promisc;
 216         int     rfmon;
 217         int     tstamp_type;
 218 };
 219
 220 /*
 221  * Ultrix, DEC OSF/1^H^H^H^H^H^H^H^H^HDigital UNIX^H^H^H^H^H^H^H^H^H^H^H^H
 222  * Tru64 UNIX, and some versions of NetBSD pad FDDI packets to make everything
 223  * line up on a nice boundary.
 224  */
 225 #ifdef __NetBSD__
 226 #include <sys/param.h>  /* needed to declare __NetBSD_Version__ */
 227 #endif
 228
 229 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000)
 230 #define       PCAP_FDDIPAD 3
 231 #endif
 232
 233 typedef int     (*activate_op_t)(pcap_t *);
 234 typedef int     (*can_set_rfmon_op_t)(pcap_t *);
 235 typedef int     (*read_op_t)(pcap_t *, int cnt, pcap_handler, u_char *);
 236 typedef int     (*inject_op_t)(pcap_t *, const void *, size_t);
 237 typedef int     (*setfilter_op_t)(pcap_t *, struct bpf_program *);
 238 typedef int     (*setdirection_op_t)(pcap_t *, pcap_direction_t);
 239 typedef int     (*set_datalink_op_t)(pcap_t *, int);
 240 typedef int     (*getnonblock_op_t)(pcap_t *, char *);
 241 typedef int     (*setnonblock_op_t)(pcap_t *, int, char *);
 242 typedef int     (*stats_op_t)(pcap_t *, struct pcap_stat *);
 243 #ifdef WIN32
 244 typedef int     (*setbuff_op_t)(pcap_t *, int);
 245 typedef int     (*setmode_op_t)(pcap_t *, int);
 246 typedef int     (*setmintocopy_op_t)(pcap_t *, int);
 247 #endif
 248 typedef void    (*cleanup_op_t)(pcap_t *);
 249
 250 struct pcap {
 251 #ifdef WIN32
 252         ADAPTER *adapter;
 253         LPPACKET Packet;
 254         int nonblock;
 255 #else
 256         int fd;
 257         int selectable_fd;
 258         int send_fd;
 259 #endif /* WIN32 */
 260
 261 #ifdef HAVE_LIBDLPI
 262         dlpi_handle_t dlpi_hd;
 263 #endif
 264         int snapshot;
 265         int linktype;           /* Network linktype */
 266         int linktype_ext;       /* Extended information stored in the linktype field of a file */
 267         int tzoff;              /* timezone offset */
 268         int offset;             /* offset for proper alignment */
 269         int activated;          /* true if the capture is really started */
 270         int oldstyle;           /* if we're opening with pcap_open_live() */
 271
 272         int break_loop;         /* flag set to force break from packet-reading loop */
 273
 274 #ifdef PCAP_FDDIPAD
 275         int fddipad;
 276 #endif
 277
 278 #ifdef MSDOS
 279         void (*wait_proc)(void); /*          call proc while waiting */
 280 #endif
 281
 282         struct pcap_sf sf;
 283         struct pcap_md md;
 284         struct pcap_opt opt;
 285
 286         /*
 287          * Read buffer.
 288          */
 289         int bufsize;
 290         u_char *buffer;
 291         u_char *bp;
 292         int cc;
 293
 294         /*
 295          * Place holder for pcap_next().
 296          */
 297         u_char *pkt;
 298
 299         /* We're accepting only packets in this direction/these directions. */
 300         pcap_direction_t direction;
 301
 302         /*
 303          * Methods.
 304          */
 305         activate_op_t activate_op;
 306         can_set_rfmon_op_t can_set_rfmon_op;
 307         read_op_t read_op;
 308         inject_op_t inject_op;
 309         setfilter_op_t setfilter_op;
 310         setdirection_op_t setdirection_op;
 311         set_datalink_op_t set_datalink_op;
 312         getnonblock_op_t getnonblock_op;
 313         setnonblock_op_t setnonblock_op;
 314         stats_op_t stats_op;
 315
 316         /*
 317          * Routine to use as callback for pcap_next()/pcap_next_ex().
 318          */
 319         pcap_handler oneshot_callback;
 320
 321 #ifdef WIN32
 322         /*
 323          * These are, at least currently, specific to the Win32 NPF
 324          * driver.
 325          */
 326         setbuff_op_t setbuff_op;
 327         setmode_op_t setmode_op;
 328         setmintocopy_op_t setmintocopy_op;
 329 #endif
 330         cleanup_op_t cleanup_op;
 331
 332         /*
 333          * Placeholder for filter code if bpf not in kernel.
 334          */
 335         struct bpf_program fcode;
 336
 337         char errbuf[PCAP_ERRBUF_SIZE + 1];
 338         int dlt_count;
 339         u_int *dlt_list;
 340         int tstamp_type_count;
 341         u_int *tstamp_type_list;
 342
 343         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 344 };
 345
 346 /*
 347  * This is a timeval as stored in a savefile.
 348  * It has to use the same types everywhere, independent of the actual
 349  * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
 350  * platforms and 64-bit tv_sec values on other platforms, and writing
 351  * out native `struct timeval' values would mean files could only be
 352  * read on systems with the same tv_sec size as the system on which
 353  * the file was written.
 354  */
 355
 356 struct pcap_timeval {
 357     bpf_int32 tv_sec;           /* seconds */
 358     bpf_int32 tv_usec;          /* microseconds */
 359 };
 360
 361 /*
 362  * This is a `pcap_pkthdr' as actually stored in a savefile.
 363  *
 364  * Do not change the format of this structure, in any way (this includes
 365  * changes that only affect the length of fields in this structure),
 366  * and do not make the time stamp anything other than seconds and
 367  * microseconds (e.g., seconds and nanoseconds).  Instead:
 368  *
 369  *      introduce a new structure for the new format;
 370  *
 371  *      send mail to "tcpdump-workers@lists.tcpdump.org", requesting
 372  *      a new magic number for your new capture file format, and, when
 373  *      you get the new magic number, put it in "savefile.c";
 374  *
 375  *      use that magic number for save files with the changed record
 376  *      header;
 377  *
 378  *      make the code in "savefile.c" capable of reading files with
 379  *      the old record header as well as files with the new record header
 380  *      (using the magic number to determine the header format).
 381  *
 382  * Then supply the changes by forking the branch at
 383  *
 384  *      https://github.com/the-tcpdump-group/libpcap/issues
 385  *
 386  * and issuing a pull request, so that future versions of libpcap and
 387  * programs that use it (such as tcpdump) will be able to read your new
 388  * capture file format.
 389  */
 390
 391 struct pcap_sf_pkthdr {
 392     struct pcap_timeval ts;     /* time stamp */
 393     bpf_u_int32 caplen;         /* length of portion present */
 394     bpf_u_int32 len;            /* length this packet (off wire) */
 395 };
 396
 397 /*
 398  * How a `pcap_pkthdr' is actually stored in savefiles written
 399  * by some patched versions of libpcap (e.g. the ones in Red
 400  * Hat Linux 6.1 and 6.2).
 401  *
 402  * Do not change the format of this structure, in any way (this includes
 403  * changes that only affect the length of fields in this structure).
 404  * Instead, introduce a new structure, as per the above.
 405  */
 406
 407 struct pcap_sf_patched_pkthdr {
 408     struct pcap_timeval ts;     /* time stamp */
 409     bpf_u_int32 caplen;         /* length of portion present */
 410     bpf_u_int32 len;            /* length this packet (off wire) */
 411     int         index;
 412     unsigned short protocol;
 413     unsigned char pkt_type;
 414 };
 415
 416 /*
 417  * User data structure for the one-shot callback used for pcap_next()
 418  * and pcap_next_ex().
 419  */
 420 struct oneshot_userdata {
 421         struct pcap_pkthdr *hdr;
 422         const u_char **pkt;
 423         pcap_t *pd;
 424 };
 425
 426 int     yylex(void);
 427
 428 #ifndef min
 429 #define min(a, b) ((a) > (b) ? (b) : (a))
 430 #endif
 431
 432 /* XXX should these be in pcap.h? */
 433 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 434 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 435
 436 #ifndef HAVE_STRLCPY
 437 #define strlcpy(x, y, z) \
 438         (strncpy((x), (y), (z)), \
 439          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 440          strlen((y)))
 441 #endif
 442
 443 #include <stdarg.h>
 444
 445 #if !defined(HAVE_SNPRINTF)
 446 #define snprintf pcap_snprintf
 447 extern int snprintf (char *, size_t, const char *, ...);
 448 #endif
 449
 450 #if !defined(HAVE_VSNPRINTF)
 451 #define vsnprintf pcap_vsnprintf
 452 extern int vsnprintf (char *, size_t, const char *, va_list ap);
 453 #endif
 454
 455 /*
 456  * Routines that most pcap implementations can use for non-blocking mode.
 457  */
 458 #if !defined(WIN32) && !defined(MSDOS)
 459 int     pcap_getnonblock_fd(pcap_t *, char *);
 460 int     pcap_setnonblock_fd(pcap_t *p, int, char *);
 461 #endif
 462
 463 /*
 464  * Internal interfaces for "pcap_create()".
 465  *
 466  * "pcap_create_interface()" is the routine to do a pcap_create on
 467  * a regular network interface.  There are multiple implementations
 468  * of this, one for each platform type (Linux, BPF, DLPI, etc.),
 469  * with the one used chosen by the configure script.
 470  *
 471  * "pcap_create_common()" allocates and fills in a pcap_t, for use
 472  * by pcap_create routines.
 473  */
 474 pcap_t  *pcap_create_interface(const char *, char *);
 475 pcap_t  *pcap_create_common(const char *, char *);
 476 int     pcap_do_addexit(pcap_t *);
 477 void    pcap_add_to_pcaps_to_close(pcap_t *);
 478 void    pcap_remove_from_pcaps_to_close(pcap_t *);
 479 void    pcap_cleanup_live_common(pcap_t *);
 480 int     pcap_not_initialized(pcap_t *);
 481 int     pcap_check_activated(pcap_t *);
 482
 483 /*
 484  * Internal interfaces for "pcap_findalldevs()".
 485  *
 486  * "pcap_findalldevs_interfaces()" finds interfaces using the
 487  * "standard" mechanisms (SIOCGIFCONF, "getifaddrs()", etc.).
 488  *
 489  * "pcap_platform_finddevs()" is a platform-dependent routine to
 490  * add devices not found by the "standard" mechanisms.
 491  *
 492  * "pcap_add_if()" adds an interface to the list of interfaces, for
 493  * use by various "find interfaces" routines.
 494  */
 495 int     pcap_findalldevs_interfaces(pcap_if_t **, char *);
 496 int     pcap_platform_finddevs(pcap_if_t **, char *);
 497 int     add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
 498             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 499             struct sockaddr *, size_t, char *);
 500 int     pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
 501 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 502 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 503             const char *, char *);
 504
 505 #ifdef WIN32
 506 char    *pcap_win32strerror(void);
 507 #endif
 508
 509 int     install_bpf_program(pcap_t *, struct bpf_program *);
 510
 511 int     pcap_strcasecmp(const char *, const char *);
 512
 513 #ifdef __cplusplus
 514 }
 515 #endif
 516
 517 #endif