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   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 #endif /* WIN32 */
  52
  53 #ifdef MSDOS
  54 #include <fcntl.h>
  55 #include <io.h>
  56 #endif
  57
  58 #if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/
  59
  60 /*
  61  * Swap byte ordering of unsigned long long timestamp on a big endian
  62  * machine.
  63  */
  64 #define SWAPLL(ull)  ((ull & 0xff00000000000000) >> 56) | \
  65                       ((ull & 0x00ff000000000000) >> 40) | \
  66                       ((ull & 0x0000ff0000000000) >> 24) | \
  67                       ((ull & 0x000000ff00000000) >> 8)  | \
  68                       ((ull & 0x00000000ff000000) << 8)  | \
  69                       ((ull & 0x0000000000ff0000) << 24) | \
  70                       ((ull & 0x000000000000ff00) << 40) | \
  71                       ((ull & 0x00000000000000ff) << 56)
  72
  73 #else /* A recent Visual studio compiler or not VC */
  74
  75 /*
  76  * Swap byte ordering of unsigned long long timestamp on a big endian
  77  * machine.
  78  */
  79 #define SWAPLL(ull)  ((ull & 0xff00000000000000LL) >> 56) | \
  80                       ((ull & 0x00ff000000000000LL) >> 40) | \
  81                       ((ull & 0x0000ff0000000000LL) >> 24) | \
  82                       ((ull & 0x000000ff00000000LL) >> 8)  | \
  83                       ((ull & 0x00000000ff000000LL) << 8)  | \
  84                       ((ull & 0x0000000000ff0000LL) << 24) | \
  85                       ((ull & 0x000000000000ff00LL) << 40) | \
  86                       ((ull & 0x00000000000000ffLL) << 56)
  87
  88 #endif /* _MSC_VER */
  89
  90 /*
  91  * Savefile
  92  */
  93 typedef enum {
  94         NOT_SWAPPED,
  95         SWAPPED,
  96         MAYBE_SWAPPED
  97 } swapped_type_t;
  98
  99 /*
 100  * Used when reading a savefile.
 101  */
 102 struct pcap_sf {
 103         FILE *rfile;
 104         int swapped;
 105         size_t hdrsize;
 106         swapped_type_t lengths_swapped;
 107         int version_major;
 108         int version_minor;
 109         u_char *base;
 110 };
 111
 112 #ifdef linux
 113 union thdr {
 114         struct tpacket_hdr      *h1;
 115         struct tpacket2_hdr     *h2;
 116         void                    *raw;
 117 };
 118 #endif
 119
 120 /*
 121  * Used when doing a live capture.
 122  */
 123 struct pcap_md {
 124         struct pcap_stat stat;
 125         /*XXX*/
 126         int use_bpf;            /* using kernel filter */
 127         u_long  TotPkts;        /* can't oflow for 79 hrs on ether */
 128         u_long  TotAccepted;    /* count accepted by filter */
 129         u_long  TotDrops;       /* count of dropped packets */
 130         long    TotMissed;      /* missed by i/f during this run */
 131         long    OrigMissed;     /* missed by i/f before this run */
 132         char    *device;        /* device name */
 133         int     timeout;        /* timeout for buffering */
 134         int     must_clear;     /* stuff we must clear when we close */
 135         struct pcap *next;      /* list of open pcaps that need stuff cleared on close */
 136 #ifdef linux
 137         int     sock_packet;    /* using Linux 2.0 compatible interface */
 138         int     cooked;         /* using SOCK_DGRAM rather than SOCK_RAW */
 139         int     ifindex;        /* interface index of device we're bound to */
 140         int     lo_ifindex;     /* interface index of the loopback device */
 141         u_int   packets_read;   /* count of packets read with recvfrom() */
 142         bpf_u_int32 oldmode;    /* mode to restore when turning monitor mode off */
 143         u_int   tp_version;     /* version of tpacket_hdr for mmaped ring */
 144         u_int   tp_hdrlen;      /* hdrlen of tpacket_hdr for mmaped ring */
 145         union thdr prev_pkt;    /* previous packet handed to the callback */
 146 #endif /* linux */
 147
 148 #ifdef HAVE_DAG_API
 149 #ifdef HAVE_DAG_STREAMS_API
 150         u_char  *dag_mem_bottom;        /* DAG card current memory bottom pointer */
 151         u_char  *dag_mem_top;   /* DAG card current memory top pointer */
 152 #else /* HAVE_DAG_STREAMS_API */
 153         void    *dag_mem_base;  /* DAG card memory base address */
 154         u_int   dag_mem_bottom; /* DAG card current memory bottom offset */
 155         u_int   dag_mem_top;    /* DAG card current memory top offset */
 156 #endif /* HAVE_DAG_STREAMS_API */
 157         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
 158         int     dag_offset_flags; /* Flags to pass to dag_offset(). */
 159         int     dag_stream;     /* DAG stream number */
 160         int     dag_timeout;    /* timeout specified to pcap_open_live.
 161                                  * Same as in linux above, introduce
 162                                  * generally? */
 163 #endif /* HAVE_DAG_API */
 164 #ifdef HAVE_ZEROCOPY_BPF
 165        /*
 166         * Zero-copy read buffer -- for zero-copy BPF.  'buffer' above will
 167         * alternative between these two actual mmap'd buffers as required.
 168         * As there is a header on the front size of the mmap'd buffer, only
 169         * some of the buffer is exposed to libpcap as a whole via bufsize;
 170         * zbufsize is the true size.  zbuffer tracks the current zbuf
 171         * assocated with buffer so that it can be used to decide which the
 172         * next buffer to read will be.
 173         */
 174        u_char *zbuf1, *zbuf2, *zbuffer;
 175        u_int zbufsize;
 176        u_int zerocopy;
 177        u_int interrupted;
 178        struct timespec firstsel;
 179        /*
 180         * If there's currently a buffer being actively processed, then it is
 181         * referenced here; 'buffer' is also pointed at it, but offset by the
 182         * size of the header.
 183         */
 184        struct bpf_zbuf_header *bzh;
 185 #endif /* HAVE_ZEROCOPY_BPF */
 186 };
 187
 188 /*
 189  * Stuff to clear when we close.
 190  */
 191 #define MUST_CLEAR_PROMISC      0x00000001      /* promiscuous mode */
 192 #define MUST_CLEAR_RFMON        0x00000002      /* rfmon (monitor) mode */
 193
 194 struct pcap_opt {
 195         int     buffer_size;
 196         char    *source;
 197         int     promisc;
 198         int     rfmon;
 199 };
 200
 201 /*
 202  * 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
 203  * Tru64 UNIX, and some versions of NetBSD pad FDDI packets to make everything
 204  * line up on a nice boundary.
 205  */
 206 #ifdef __NetBSD__
 207 #include <sys/param.h>  /* needed to declare __NetBSD_Version__ */
 208 #endif
 209
 210 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000)
 211 #define       PCAP_FDDIPAD 3
 212 #endif
 213
 214 typedef int     (*activate_op_t)(pcap_t *);
 215 typedef int     (*can_set_rfmon_op_t)(pcap_t *);
 216 typedef int     (*read_op_t)(pcap_t *, int cnt, pcap_handler, u_char *);
 217 typedef int     (*inject_op_t)(pcap_t *, const void *, size_t);
 218 typedef int     (*setfilter_op_t)(pcap_t *, struct bpf_program *);
 219 typedef int     (*setdirection_op_t)(pcap_t *, pcap_direction_t);
 220 typedef int     (*set_datalink_op_t)(pcap_t *, int);
 221 typedef int     (*getnonblock_op_t)(pcap_t *, char *);
 222 typedef int     (*setnonblock_op_t)(pcap_t *, int, char *);
 223 typedef int     (*stats_op_t)(pcap_t *, struct pcap_stat *);
 224 #ifdef WIN32
 225 typedef int     (*setbuff_op_t)(pcap_t *, int);
 226 typedef int     (*setmode_op_t)(pcap_t *, int);
 227 typedef int     (*setmintocopy_op_t)(pcap_t *, int);
 228 #endif
 229 typedef void    (*cleanup_op_t)(pcap_t *);
 230
 231 struct pcap {
 232 #ifdef WIN32
 233         ADAPTER *adapter;
 234         LPPACKET Packet;
 235         int nonblock;
 236 #else
 237         int fd;
 238         int selectable_fd;
 239         int send_fd;
 240 #endif /* WIN32 */
 241
 242 #ifdef HAVE_LIBDLPI
 243         dlpi_handle_t dlpi_hd;
 244 #endif
 245         int snapshot;
 246         int linktype;           /* Network linktype */
 247         int linktype_ext;       /* Extended information stored in the linktype field of a file */
 248         int tzoff;              /* timezone offset */
 249         int offset;             /* offset for proper alignment */
 250         int activated;          /* true if the capture is really started */
 251         int oldstyle;           /* if we're opening with pcap_open_live() */
 252
 253         int break_loop;         /* flag set to force break from packet-reading loop */
 254
 255 #ifdef PCAP_FDDIPAD
 256         int fddipad;
 257 #endif
 258
 259 #ifdef MSDOS
 260         void (*wait_proc)(void); /*          call proc while waiting */
 261 #endif
 262
 263         struct pcap_sf sf;
 264         struct pcap_md md;
 265         struct pcap_opt opt;
 266
 267         /*
 268          * Read buffer.
 269          */
 270         int bufsize;
 271         u_char *buffer;
 272         u_char *bp;
 273         int cc;
 274
 275         /*
 276          * Place holder for pcap_next().
 277          */
 278         u_char *pkt;
 279
 280         /* We're accepting only packets in this direction/these directions. */
 281         pcap_direction_t direction;
 282
 283         /*
 284          * Methods.
 285          */
 286         activate_op_t activate_op;
 287         can_set_rfmon_op_t can_set_rfmon_op;
 288         read_op_t read_op;
 289         inject_op_t inject_op;
 290         setfilter_op_t setfilter_op;
 291         setdirection_op_t setdirection_op;
 292         set_datalink_op_t set_datalink_op;
 293         getnonblock_op_t getnonblock_op;
 294         setnonblock_op_t setnonblock_op;
 295         stats_op_t stats_op;
 296
 297 #ifdef WIN32
 298         /*
 299          * These are, at least currently, specific to the Win32 NPF
 300          * driver.
 301          */
 302         setbuff_op_t setbuff_op;
 303         setmode_op_t setmode_op;
 304         setmintocopy_op_t setmintocopy_op;
 305 #endif
 306         cleanup_op_t cleanup_op;
 307
 308         /*
 309          * Placeholder for filter code if bpf not in kernel.
 310          */
 311         struct bpf_program fcode;
 312
 313         char errbuf[PCAP_ERRBUF_SIZE + 1];
 314         int dlt_count;
 315         u_int *dlt_list;
 316
 317         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 318 };
 319
 320 /*
 321  * This is a timeval as stored in a savefile.
 322  * It has to use the same types everywhere, independent of the actual
 323  * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
 324  * platforms and 64-bit tv_sec values on other platforms, and writing
 325  * out native `struct timeval' values would mean files could only be
 326  * read on systems with the same tv_sec size as the system on which
 327  * the file was written.
 328  */
 329
 330 struct pcap_timeval {
 331     bpf_int32 tv_sec;           /* seconds */
 332     bpf_int32 tv_usec;          /* microseconds */
 333 };
 334
 335 /*
 336  * This is a `pcap_pkthdr' as actually stored in a savefile.
 337  *
 338  * Do not change the format of this structure, in any way (this includes
 339  * changes that only affect the length of fields in this structure),
 340  * and do not make the time stamp anything other than seconds and
 341  * microseconds (e.g., seconds and nanoseconds).  Instead:
 342  *
 343  *      introduce a new structure for the new format;
 344  *
 345  *      send mail to "tcpdump-workers@lists.tcpdump.org", requesting
 346  *      a new magic number for your new capture file format, and, when
 347  *      you get the new magic number, put it in "savefile.c";
 348  *
 349  *      use that magic number for save files with the changed record
 350  *      header;
 351  *
 352  *      make the code in "savefile.c" capable of reading files with
 353  *      the old record header as well as files with the new record header
 354  *      (using the magic number to determine the header format).
 355  *
 356  * Then supply the changes as a patch at
 357  *
 358  *      http://sourceforge.net/projects/libpcap/
 359  *
 360  * so that future versions of libpcap and programs that use it (such as
 361  * tcpdump) will be able to read your new capture file format.
 362  */
 363
 364 struct pcap_sf_pkthdr {
 365     struct pcap_timeval ts;     /* time stamp */
 366     bpf_u_int32 caplen;         /* length of portion present */
 367     bpf_u_int32 len;            /* length this packet (off wire) */
 368 };
 369
 370 /*
 371  * How a `pcap_pkthdr' is actually stored in savefiles written
 372  * by some patched versions of libpcap (e.g. the ones in Red
 373  * Hat Linux 6.1 and 6.2).
 374  *
 375  * Do not change the format of this structure, in any way (this includes
 376  * changes that only affect the length of fields in this structure).
 377  * Instead, introduce a new structure, as per the above.
 378  */
 379
 380 struct pcap_sf_patched_pkthdr {
 381     struct pcap_timeval ts;     /* time stamp */
 382     bpf_u_int32 caplen;         /* length of portion present */
 383     bpf_u_int32 len;            /* length this packet (off wire) */
 384     int         index;
 385     unsigned short protocol;
 386     unsigned char pkt_type;
 387 };
 388
 389 int     yylex(void);
 390
 391 #ifndef min
 392 #define min(a, b) ((a) > (b) ? (b) : (a))
 393 #endif
 394
 395 /* XXX should these be in pcap.h? */
 396 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 397 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 398
 399 #ifndef HAVE_STRLCPY
 400 #define strlcpy(x, y, z) \
 401         (strncpy((x), (y), (z)), \
 402          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 403          strlen((y)))
 404 #endif
 405
 406 #include <stdarg.h>
 407
 408 #if !defined(HAVE_SNPRINTF)
 409 #define snprintf pcap_snprintf
 410 extern int snprintf (char *, size_t, const char *, ...);
 411 #endif
 412
 413 #if !defined(HAVE_VSNPRINTF)
 414 #define vsnprintf pcap_vsnprintf
 415 extern int vsnprintf (char *, size_t, const char *, va_list ap);
 416 #endif
 417
 418 /*
 419  * Routines that most pcap implementations can use for non-blocking mode.
 420  */
 421 #if !defined(WIN32) && !defined(MSDOS)
 422 int     pcap_getnonblock_fd(pcap_t *, char *);
 423 int     pcap_setnonblock_fd(pcap_t *p, int, char *);
 424 #endif
 425
 426 pcap_t  *pcap_create_common(const char *, char *);
 427 int     pcap_do_addexit(pcap_t *);
 428 void    pcap_add_to_pcaps_to_close(pcap_t *);
 429 void    pcap_remove_from_pcaps_to_close(pcap_t *);
 430 void    pcap_cleanup_live_common(pcap_t *);
 431 int     pcap_not_initialized(pcap_t *);
 432 int     pcap_check_activated(pcap_t *);
 433
 434 /*
 435  * Internal interfaces for "pcap_findalldevs()".
 436  *
 437  * "pcap_platform_finddevs()" is a platform-dependent routine to
 438  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 439  * "getifaddrs()", etc..
 440  *
 441  * "pcap_add_if()" adds an interface to the list of interfaces.
 442  */
 443 int     pcap_platform_finddevs(pcap_if_t **, char *);
 444 int     add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
 445             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 446             struct sockaddr *, size_t, char *);
 447 int     pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
 448 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 449 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 450             const char *, char *);
 451
 452 #ifdef WIN32
 453 char    *pcap_win32strerror(void);
 454 #endif
 455
 456 int     install_bpf_program(pcap_t *, struct bpf_program *);
 457
 458 int     pcap_strcasecmp(const char *, const char *);
 459
 460 #ifdef __cplusplus
 461 }
 462 #endif
 463
 464 #endif