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 1.68 2004-12-18 08:52:10 guy 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 #endif
  92
  93 #ifdef HAVE_DAG_API
  94         void    *dag_mem_base;  /* DAG card memory base address */
  95         u_int   dag_mem_bottom; /* DAG card current memory bottom pointer */
  96         u_int   dag_mem_top;    /* DAG card current memory top pointer */
  97         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
  98         int     dag_offset_flags; /* Flags to pass to dag_offset(). */
  99 #endif
 100 };
 101
 102 struct pcap {
 103 #ifdef WIN32
 104         ADAPTER *adapter;
 105         LPPACKET Packet;
 106         int timeout;
 107         int nonblock;
 108 #else
 109         int fd;
 110         int selectable_fd;
 111         int send_fd;
 112 #endif /* WIN32 */
 113         int snapshot;
 114         int linktype;
 115         int tzoff;              /* timezone offset */
 116         int offset;             /* offset for proper alignment */
 117
 118         int break_loop;         /* flag set to force break from packet-reading loop */
 119
 120 #ifdef PCAP_FDDIPAD
 121         int fddipad;
 122 #endif
 123
 124 #ifdef MSDOS
 125         int inter_packet_wait;   /* offline: wait between packets */
 126         void (*wait_proc)(void); /*          call proc while waiting */
 127 #endif
 128
 129         struct pcap_sf sf;
 130         struct pcap_md md;
 131
 132         /*
 133          * Read buffer.
 134          */
 135         int bufsize;
 136         u_char *buffer;
 137         u_char *bp;
 138         int cc;
 139
 140         /*
 141          * Place holder for pcap_next().
 142          */
 143         u_char *pkt;
 144
 145         /*
 146          * Methods.
 147          */
 148         int     (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
 149         int     (*inject_op)(pcap_t *, const void *, size_t);
 150         int     (*setfilter_op)(pcap_t *, struct bpf_program *);
 151         int     (*set_datalink_op)(pcap_t *, int);
 152         int     (*getnonblock_op)(pcap_t *, char *);
 153         int     (*setnonblock_op)(pcap_t *, int, char *);
 154         int     (*stats_op)(pcap_t *, struct pcap_stat *);
 155         void    (*close_op)(pcap_t *);
 156
 157         /*
 158          * Placeholder for filter code if bpf not in kernel.
 159          */
 160         struct bpf_program fcode;
 161
 162         char errbuf[PCAP_ERRBUF_SIZE + 1];
 163         int dlt_count;
 164         u_int *dlt_list;
 165
 166         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 167 };
 168
 169 /*
 170  * This is a timeval as stored in disk in a dumpfile.
 171  * It has to use the same types everywhere, independent of the actual
 172  * `struct timeval'
 173  */
 174
 175 struct pcap_timeval {
 176     bpf_int32 tv_sec;           /* seconds */
 177     bpf_int32 tv_usec;          /* microseconds */
 178 };
 179
 180 /*
 181  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 182  *
 183  * Do not change the format of this structure, in any way (this includes
 184  * changes that only affect the length of fields in this structure),
 185  * and do not make the time stamp anything other than seconds and
 186  * microseconds (e.g., seconds and nanoseconds).  Instead:
 187  *
 188  *      introduce a new structure for the new format;
 189  *
 190  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 191  *      magic number for your new capture file format, and, when
 192  *      you get the new magic number, put it in "savefile.c";
 193  *
 194  *      use that magic number for save files with the changed record
 195  *      header;
 196  *
 197  *      make the code in "savefile.c" capable of reading files with
 198  *      the old record header as well as files with the new record header
 199  *      (using the magic number to determine the header format).
 200  *
 201  * Then supply the changes to "patches@tcpdump.org", so that future
 202  * versions of libpcap and programs that use it (such as tcpdump) will
 203  * be able to read your new capture file format.
 204  */
 205
 206 struct pcap_sf_pkthdr {
 207     struct pcap_timeval ts;     /* time stamp */
 208     bpf_u_int32 caplen;         /* length of portion present */
 209     bpf_u_int32 len;            /* length this packet (off wire) */
 210 };
 211
 212 /*
 213  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 214  * by some patched versions of libpcap (e.g. the ones in Red
 215  * Hat Linux 6.1 and 6.2).
 216  *
 217  * Do not change the format of this structure, in any way (this includes
 218  * changes that only affect the length of fields in this structure).
 219  * Instead, introduce a new structure, as per the above.
 220  */
 221
 222 struct pcap_sf_patched_pkthdr {
 223     struct pcap_timeval ts;     /* time stamp */
 224     bpf_u_int32 caplen;         /* length of portion present */
 225     bpf_u_int32 len;            /* length this packet (off wire) */
 226     int         index;
 227     unsigned short protocol;
 228     unsigned char pkt_type;
 229 };
 230
 231 int     yylex(void);
 232
 233 #ifndef min
 234 #define min(a, b) ((a) > (b) ? (b) : (a))
 235 #endif
 236
 237 /* XXX should these be in pcap.h? */
 238 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 239 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 240
 241
 242 /*
 243  * 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
 244  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 245  */
 246 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
 247 #define       PCAP_FDDIPAD 3
 248 #endif
 249
 250 #ifndef HAVE_STRLCPY
 251 #define strlcpy(x, y, z) \
 252         (strncpy((x), (y), (z)), \
 253          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 254          strlen((y)))
 255 #endif
 256
 257 #include <stdarg.h>
 258
 259 #if !defined(HAVE_SNPRINTF)
 260 #define snprintf pcap_snprintf
 261 extern int snprintf (char *, size_t, const char *, ...);
 262 #endif
 263
 264 #if !defined(HAVE_VSNPRINTF)
 265 #define vsnprintf pcap_vsnprintf
 266 extern int vsnprintf (char *, size_t, const char *, va_list ap);
 267 #endif
 268
 269 /*
 270  * Routines that most pcap implementations can use for non-blocking mode.
 271  */
 272 #if !defined(WIN32) && !defined(MSDOS)
 273 int     pcap_getnonblock_fd(pcap_t *, char *);
 274 int     pcap_setnonblock_fd(pcap_t *p, int, char *);
 275 #endif
 276
 277 void    pcap_close_common(pcap_t *);
 278
 279 /*
 280  * Internal interfaces for "pcap_findalldevs()".
 281  *
 282  * "pcap_platform_finddevs()" is a platform-dependent routine to
 283  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 284  * "getifaddrs()", etc..
 285  *
 286  * "pcap_add_if()" adds an interface to the list of interfaces.
 287  */
 288 int     pcap_platform_finddevs(pcap_if_t **, char *);
 289 int     add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
 290             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 291             struct sockaddr *, size_t, char *);
 292 int     pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
 293 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 294 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 295             const char *, char *);
 296
 297 #ifdef WIN32
 298 char    *pcap_win32strerror(void);
 299 #endif
 300
 301 int     install_bpf_program(pcap_t *, struct bpf_program *);
 302
 303 int     pcap_strcasecmp(const char *, const char *);
 304
 305 #ifdef __cplusplus
 306 }
 307 #endif
 308
 309 #endif