contrib/libpcap/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  * $FreeBSD$
  34  * @(#) $Header: /tcpdump/master/libpcap/pcap-int.h,v 1.68.2.11 2007/06/22 06:43:58 guy Exp $ (LBL)
  35  */
  36
  37 #ifndef pcap_int_h
  38 #define pcap_int_h
  39
  40 #ifdef __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 #include <pcap.h>
  45
  46 #ifdef WIN32
  47 #include <Packet32.h>
  48 #endif /* WIN32 */
  49
  50 #ifdef MSDOS
  51 #include <fcntl.h>
  52 #include <io.h>
  53 #endif
  54
  55 /*
  56  * Swap byte ordering of unsigned long long timestamp on a big endian
  57  * machine.
  58  */
  59 #define SWAPLL(ull)  ((ull & 0xff00000000000000LL) >> 56) | \
  60                       ((ull & 0x00ff000000000000LL) >> 40) | \
  61                       ((ull & 0x0000ff0000000000LL) >> 24) | \
  62                       ((ull & 0x000000ff00000000LL) >> 8)  | \
  63                       ((ull & 0x00000000ff000000LL) << 8)  | \
  64                       ((ull & 0x0000000000ff0000LL) << 24) | \
  65                       ((ull & 0x000000000000ff00LL) << 40) | \
  66                       ((ull & 0x00000000000000ffLL) << 56)
  67
  68 /*
  69  * Savefile
  70  */
  71 typedef enum {
  72         NOT_SWAPPED,
  73         SWAPPED,
  74         MAYBE_SWAPPED
  75 } swapped_type_t;
  76
  77 struct pcap_sf {
  78         FILE *rfile;
  79         int swapped;
  80         int hdrsize;
  81         swapped_type_t lengths_swapped;
  82         int version_major;
  83         int version_minor;
  84         u_char *base;
  85 };
  86
  87 struct pcap_md {
  88         struct pcap_stat stat;
  89         /*XXX*/
  90         int use_bpf;            /* using kernel filter */
  91         u_long  TotPkts;        /* can't oflow for 79 hrs on ether */
  92         u_long  TotAccepted;    /* count accepted by filter */
  93         u_long  TotDrops;       /* count of dropped packets */
  94         long    TotMissed;      /* missed by i/f during this run */
  95         long    OrigMissed;     /* missed by i/f before this run */
  96         char    *device;        /* device name */
  97 #ifdef linux
  98         int     sock_packet;    /* using Linux 2.0 compatible interface */
  99         int     timeout;        /* timeout specified to pcap_open_live */
 100         int     clear_promisc;  /* must clear promiscuous mode when we close */
 101         int     cooked;         /* using SOCK_DGRAM rather than SOCK_RAW */
 102         int     ifindex;        /* interface index of device we're bound to */
 103         int     lo_ifindex;     /* interface index of the loopback device */
 104         struct pcap *next;      /* list of open promiscuous sock_packet pcaps */
 105         u_int   packets_read;   /* count of packets read with recvfrom() */
 106 #endif
 107
 108 #ifdef HAVE_DAG_API
 109 #ifdef HAVE_DAG_STREAMS_API
 110         u_char  *dag_mem_bottom;        /* DAG card current memory bottom pointer */
 111         u_char  *dag_mem_top;   /* DAG card current memory top pointer */
 112 #else
 113         void    *dag_mem_base;  /* DAG card memory base address */
 114         u_int   dag_mem_bottom; /* DAG card current memory bottom offset */
 115         u_int   dag_mem_top;    /* DAG card current memory top offset */
 116 #endif /* HAVE_DAG_STREAMS_API */
 117         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
 118         int     dag_offset_flags; /* Flags to pass to dag_offset(). */
 119         int     dag_stream;     /* DAG stream number */
 120         int     dag_timeout;    /* timeout specified to pcap_open_live.
 121                                  * Same as in linux above, introduce
 122                                  * generally? */
 123 #endif /* HAVE_DAG_API */
 124 };
 125
 126 /*
 127  * 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
 128  * Tru64 UNIX, and some versions of NetBSD pad FDDI packets to make everything
 129  * line up on a nice boundary.
 130  */
 131 #ifdef __NetBSD__
 132 #include <sys/param.h>  /* needed to declare __NetBSD_Version__ */
 133 #endif
 134
 135 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000)
 136 #define       PCAP_FDDIPAD 3
 137 #endif
 138
 139 struct pcap {
 140 #ifdef WIN32
 141         ADAPTER *adapter;
 142         LPPACKET Packet;
 143         int timeout;
 144         int nonblock;
 145 #else
 146         int fd;
 147         int selectable_fd;
 148         int send_fd;
 149 #endif /* WIN32 */
 150         int snapshot;
 151         int linktype;
 152         int tzoff;              /* timezone offset */
 153         int offset;             /* offset for proper alignment */
 154
 155         int break_loop;         /* flag set to force break from packet-reading loop */
 156
 157 #ifdef PCAP_FDDIPAD
 158         int fddipad;
 159 #endif
 160
 161 #ifdef MSDOS
 162         int inter_packet_wait;   /* offline: wait between packets */
 163         void (*wait_proc)(void); /*          call proc while waiting */
 164 #endif
 165
 166         struct pcap_sf sf;
 167         struct pcap_md md;
 168
 169         /*
 170          * Read buffer.
 171          */
 172         int bufsize;
 173         u_char *buffer;
 174         u_char *bp;
 175         int cc;
 176
 177         /*
 178          * Place holder for pcap_next().
 179          */
 180         u_char *pkt;
 181
 182         /* We're accepting only packets in this direction/these directions. */
 183         pcap_direction_t direction;
 184
 185         /*
 186          * Methods.
 187          */
 188         int     (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
 189         int     (*inject_op)(pcap_t *, const void *, size_t);
 190         int     (*setfilter_op)(pcap_t *, struct bpf_program *);
 191         int     (*setdirection_op)(pcap_t *, pcap_direction_t);
 192         int     (*set_datalink_op)(pcap_t *, int);
 193         int     (*getnonblock_op)(pcap_t *, char *);
 194         int     (*setnonblock_op)(pcap_t *, int, char *);
 195         int     (*stats_op)(pcap_t *, struct pcap_stat *);
 196         void    (*close_op)(pcap_t *);
 197
 198         /*
 199          * Placeholder for filter code if bpf not in kernel.
 200          */
 201         struct bpf_program fcode;
 202
 203         char errbuf[PCAP_ERRBUF_SIZE + 1];
 204         int dlt_count;
 205         u_int *dlt_list;
 206
 207         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 208 };
 209
 210 /*
 211  * This is a timeval as stored in a savefile.
 212  * It has to use the same types everywhere, independent of the actual
 213  * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
 214  * platforms and 64-bit tv_sec values on other platforms, and writing
 215  * out native `struct timeval' values would mean files could only be
 216  * read on systems with the same tv_sec size as the system on which
 217  * the file was written.
 218  */
 219
 220 struct pcap_timeval {
 221     bpf_int32 tv_sec;           /* seconds */
 222     bpf_int32 tv_usec;          /* microseconds */
 223 };
 224
 225 /*
 226  * This is a `pcap_pkthdr' as actually stored in a savefile.
 227  *
 228  * Do not change the format of this structure, in any way (this includes
 229  * changes that only affect the length of fields in this structure),
 230  * and do not make the time stamp anything other than seconds and
 231  * microseconds (e.g., seconds and nanoseconds).  Instead:
 232  *
 233  *      introduce a new structure for the new format;
 234  *
 235  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 236  *      magic number for your new capture file format, and, when
 237  *      you get the new magic number, put it in "savefile.c";
 238  *
 239  *      use that magic number for save files with the changed record
 240  *      header;
 241  *
 242  *      make the code in "savefile.c" capable of reading files with
 243  *      the old record header as well as files with the new record header
 244  *      (using the magic number to determine the header format).
 245  *
 246  * Then supply the changes to "patches@tcpdump.org", so that future
 247  * versions of libpcap and programs that use it (such as tcpdump) will
 248  * be able to read your new capture file format.
 249  */
 250
 251 struct pcap_sf_pkthdr {
 252     struct pcap_timeval ts;     /* time stamp */
 253     bpf_u_int32 caplen;         /* length of portion present */
 254     bpf_u_int32 len;            /* length this packet (off wire) */
 255 };
 256
 257 /*
 258  * How a `pcap_pkthdr' is actually stored in savefiles written
 259  * by some patched versions of libpcap (e.g. the ones in Red
 260  * Hat Linux 6.1 and 6.2).
 261  *
 262  * Do not change the format of this structure, in any way (this includes
 263  * changes that only affect the length of fields in this structure).
 264  * Instead, introduce a new structure, as per the above.
 265  */
 266
 267 struct pcap_sf_patched_pkthdr {
 268     struct pcap_timeval ts;     /* time stamp */
 269     bpf_u_int32 caplen;         /* length of portion present */
 270     bpf_u_int32 len;            /* length this packet (off wire) */
 271     int         index;
 272     unsigned short protocol;
 273     unsigned char pkt_type;
 274 };
 275
 276 int     yylex(void);
 277
 278 #ifndef min
 279 #define min(a, b) ((a) > (b) ? (b) : (a))
 280 #endif
 281
 282 /* XXX should these be in pcap.h? */
 283 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 284 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 285
 286 #ifndef HAVE_STRLCPY
 287 #define strlcpy(x, y, z) \
 288         (strncpy((x), (y), (z)), \
 289          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 290          strlen((y)))
 291 #endif
 292
 293 #include <stdarg.h>
 294
 295 /*
 296  * Routines that most pcap implementations can use for non-blocking mode.
 297  */
 298 #if !defined(WIN32) && !defined(MSDOS)
 299 int     pcap_getnonblock_fd(pcap_t *, char *);
 300 int     pcap_setnonblock_fd(pcap_t *p, int, char *);
 301 #endif
 302
 303 void    pcap_close_common(pcap_t *);
 304
 305 /*
 306  * Internal interfaces for "pcap_findalldevs()".
 307  *
 308  * "pcap_platform_finddevs()" is a platform-dependent routine to
 309  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 310  * "getifaddrs()", etc..
 311  *
 312  * "pcap_add_if()" adds an interface to the list of interfaces.
 313  */
 314 int     pcap_platform_finddevs(pcap_if_t **, char *);
 315 int     add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
 316             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 317             struct sockaddr *, size_t, char *);
 318 int     pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
 319 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 320 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 321             const char *, char *);
 322
 323 #ifdef WIN32
 324 char    *pcap_win32strerror(void);
 325 #endif
 326
 327 int     install_bpf_program(pcap_t *, struct bpf_program *);
 328
 329 int     pcap_strcasecmp(const char *, const char *);
 330
 331 #ifdef __cplusplus
 332 }
 333 #endif
 334
 335 #endif