contrib/libpcap-0.9/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 1.68.2.9 2006/02/22 17:09:54 gianluca Exp $ (LBL)
  34  */
  35
  36 #ifndef pcap_int_h
  37 #define pcap_int_h
  38
  39 #ifdef __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 #include <pcap.h>
  44
  45 #ifdef WIN32
  46 #include <Packet32.h>
  47 #endif /* WIN32 */
  48
  49 #ifdef MSDOS
  50 #include <fcntl.h>
  51 #include <io.h>
  52 #endif
  53
  54 /*
  55  * Savefile
  56  */
  57 typedef enum {
  58         NOT_SWAPPED,
  59         SWAPPED,
  60         MAYBE_SWAPPED
  61 } swapped_type_t;
  62
  63 struct pcap_sf {
  64         FILE *rfile;
  65         int swapped;
  66         int hdrsize;
  67         swapped_type_t lengths_swapped;
  68         int version_major;
  69         int version_minor;
  70         u_char *base;
  71 };
  72
  73 struct pcap_md {
  74         struct pcap_stat stat;
  75         /*XXX*/
  76         int use_bpf;            /* using kernel filter */
  77         u_long  TotPkts;        /* can't oflow for 79 hrs on ether */
  78         u_long  TotAccepted;    /* count accepted by filter */
  79         u_long  TotDrops;       /* count of dropped packets */
  80         long    TotMissed;      /* missed by i/f during this run */
  81         long    OrigMissed;     /* missed by i/f before this run */
  82         char    *device;        /* device name */
  83 #ifdef linux
  84         int     sock_packet;    /* using Linux 2.0 compatible interface */
  85         int     timeout;        /* timeout specified to pcap_open_live */
  86         int     clear_promisc;  /* must clear promiscuous mode when we close */
  87         int     cooked;         /* using SOCK_DGRAM rather than SOCK_RAW */
  88         int     ifindex;        /* interface index of device we're bound to */
  89         int     lo_ifindex;     /* interface index of the loopback device */
  90         struct pcap *next;      /* list of open promiscuous sock_packet pcaps */
  91         u_int   packets_read;   /* count of packets read with recvfrom() */
  92 #endif
  93
  94 #ifdef HAVE_DAG_API
  95 #ifdef HAVE_DAG_STREAMS_API
  96         u_char  *dag_mem_bottom;        /* DAG card current memory bottom pointer */
  97         u_char  *dag_mem_top;   /* DAG card current memory top pointer */
  98 #else
  99         void    *dag_mem_base;  /* DAG card memory base address */
 100         u_int   dag_mem_bottom; /* DAG card current memory bottom offset */
 101         u_int   dag_mem_top;    /* DAG card current memory top offset */
 102 #endif /* HAVE_DAG_STREAMS_API */
 103         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
 104         int     dag_offset_flags; /* Flags to pass to dag_offset(). */
 105         int     dag_stream;     /* DAG stream number */
 106         int     dag_timeout;    /* timeout specified to pcap_open_live.
 107                                  * Same as in linux above, introduce
 108                                  * generally? */
 109 #endif /* HAVE_DAG_API */
 110 };
 111
 112 /*
 113  * 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
 114  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 115  */
 116 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000)
 117 #define       PCAP_FDDIPAD 3
 118 #endif
 119
 120 struct pcap {
 121 #ifdef WIN32
 122         ADAPTER *adapter;
 123         LPPACKET Packet;
 124         int timeout;
 125         int nonblock;
 126 #else
 127         int fd;
 128         int selectable_fd;
 129         int send_fd;
 130 #endif /* WIN32 */
 131         int snapshot;
 132         int linktype;
 133         int tzoff;              /* timezone offset */
 134         int offset;             /* offset for proper alignment */
 135
 136         int break_loop;         /* flag set to force break from packet-reading loop */
 137
 138 #ifdef PCAP_FDDIPAD
 139         int fddipad;
 140 #endif
 141
 142 #ifdef MSDOS
 143         int inter_packet_wait;   /* offline: wait between packets */
 144         void (*wait_proc)(void); /*          call proc while waiting */
 145 #endif
 146
 147         struct pcap_sf sf;
 148         struct pcap_md md;
 149
 150         /*
 151          * Read buffer.
 152          */
 153         int bufsize;
 154         u_char *buffer;
 155         u_char *bp;
 156         int cc;
 157
 158         /*
 159          * Place holder for pcap_next().
 160          */
 161         u_char *pkt;
 162
 163         /* We're accepting only packets in this direction/these directions. */
 164         pcap_direction_t direction;
 165
 166         /*
 167          * Methods.
 168          */
 169         int     (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
 170         int     (*inject_op)(pcap_t *, const void *, size_t);
 171         int     (*setfilter_op)(pcap_t *, struct bpf_program *);
 172         int     (*setdirection_op)(pcap_t *, pcap_direction_t);
 173         int     (*set_datalink_op)(pcap_t *, int);
 174         int     (*getnonblock_op)(pcap_t *, char *);
 175         int     (*setnonblock_op)(pcap_t *, int, char *);
 176         int     (*stats_op)(pcap_t *, struct pcap_stat *);
 177         void    (*close_op)(pcap_t *);
 178
 179         /*
 180          * Placeholder for filter code if bpf not in kernel.
 181          */
 182         struct bpf_program fcode;
 183
 184         char errbuf[PCAP_ERRBUF_SIZE + 1];
 185         int dlt_count;
 186         u_int *dlt_list;
 187
 188         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 189 };
 190
 191 /*
 192  * This is a timeval as stored in a savefile.
 193  * It has to use the same types everywhere, independent of the actual
 194  * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
 195  * platforms and 64-bit tv_sec values on other platforms, and writing
 196  * out native `struct timeval' values would mean files could only be
 197  * read on systems with the same tv_sec size as the system on which
 198  * the file was written.
 199  */
 200
 201 struct pcap_timeval {
 202     bpf_int32 tv_sec;           /* seconds */
 203     bpf_int32 tv_usec;          /* microseconds */
 204 };
 205
 206 /*
 207  * This is a `pcap_pkthdr' as actually stored in a savefile.
 208  *
 209  * Do not change the format of this structure, in any way (this includes
 210  * changes that only affect the length of fields in this structure),
 211  * and do not make the time stamp anything other than seconds and
 212  * microseconds (e.g., seconds and nanoseconds).  Instead:
 213  *
 214  *      introduce a new structure for the new format;
 215  *
 216  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 217  *      magic number for your new capture file format, and, when
 218  *      you get the new magic number, put it in "savefile.c";
 219  *
 220  *      use that magic number for save files with the changed record
 221  *      header;
 222  *
 223  *      make the code in "savefile.c" capable of reading files with
 224  *      the old record header as well as files with the new record header
 225  *      (using the magic number to determine the header format).
 226  *
 227  * Then supply the changes to "patches@tcpdump.org", so that future
 228  * versions of libpcap and programs that use it (such as tcpdump) will
 229  * be able to read your new capture file format.
 230  */
 231
 232 struct pcap_sf_pkthdr {
 233     struct pcap_timeval ts;     /* time stamp */
 234     bpf_u_int32 caplen;         /* length of portion present */
 235     bpf_u_int32 len;            /* length this packet (off wire) */
 236 };
 237
 238 /*
 239  * How a `pcap_pkthdr' is actually stored in savefiles written
 240  * by some patched versions of libpcap (e.g. the ones in Red
 241  * Hat Linux 6.1 and 6.2).
 242  *
 243  * Do not change the format of this structure, in any way (this includes
 244  * changes that only affect the length of fields in this structure).
 245  * Instead, introduce a new structure, as per the above.
 246  */
 247
 248 struct pcap_sf_patched_pkthdr {
 249     struct pcap_timeval ts;     /* time stamp */
 250     bpf_u_int32 caplen;         /* length of portion present */
 251     bpf_u_int32 len;            /* length this packet (off wire) */
 252     int         index;
 253     unsigned short protocol;
 254     unsigned char pkt_type;
 255 };
 256
 257 int     yylex(void);
 258
 259 #ifndef min
 260 #define min(a, b) ((a) > (b) ? (b) : (a))
 261 #endif
 262
 263 /* XXX should these be in pcap.h? */
 264 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 265 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 266
 267 #ifndef HAVE_STRLCPY
 268 #define strlcpy(x, y, z) \
 269         (strncpy((x), (y), (z)), \
 270          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 271          strlen((y)))
 272 #endif
 273
 274 #include <stdarg.h>
 275
 276 #if !defined(HAVE_SNPRINTF)
 277 #define snprintf pcap_snprintf
 278 extern int snprintf (char *, size_t, const char *, ...);
 279 #endif
 280
 281 #if !defined(HAVE_VSNPRINTF)
 282 #define vsnprintf pcap_vsnprintf
 283 extern int vsnprintf (char *, size_t, const char *, va_list ap);
 284 #endif
 285
 286 /*
 287  * Routines that most pcap implementations can use for non-blocking mode.
 288  */
 289 #if !defined(WIN32) && !defined(MSDOS)
 290 int     pcap_getnonblock_fd(pcap_t *, char *);
 291 int     pcap_setnonblock_fd(pcap_t *p, int, char *);
 292 #endif
 293
 294 void    pcap_close_common(pcap_t *);
 295
 296 /*
 297  * Internal interfaces for "pcap_findalldevs()".
 298  *
 299  * "pcap_platform_finddevs()" is a platform-dependent routine to
 300  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 301  * "getifaddrs()", etc..
 302  *
 303  * "pcap_add_if()" adds an interface to the list of interfaces.
 304  */
 305 int     pcap_platform_finddevs(pcap_if_t **, char *);
 306 int     add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
 307             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 308             struct sockaddr *, size_t, char *);
 309 int     pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
 310 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 311 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 312             const char *, char *);
 313
 314 #ifdef WIN32
 315 char    *pcap_win32strerror(void);
 316 #endif
 317
 318 int     install_bpf_program(pcap_t *, struct bpf_program *);
 319
 320 int     pcap_strcasecmp(const char *, const char *);
 321
 322 #ifdef __cplusplus
 323 }
 324 #endif
 325
 326 #endif