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 1.28 2000-09-19 03:28:10 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 /*
  46  * Savefile
  47  */
  48 struct pcap_sf {
  49         FILE *rfile;
  50         int swapped;
  51         int hdrsize;
  52         int version_major;
  53         int version_minor;
  54         u_char *base;
  55 };
  56
  57 struct pcap_md {
  58         struct pcap_stat stat;
  59         /*XXX*/
  60         int use_bpf;            /* using kernel filter */
  61         u_long  TotPkts;        /* can't oflow for 79 hrs on ether */
  62         u_long  TotAccepted;    /* count accepted by filter */
  63         u_long  TotDrops;       /* count of dropped packets */
  64         long    TotMissed;      /* missed by i/f during this run */
  65         long    OrigMissed;     /* missed by i/f before this run */
  66 #ifdef linux
  67         int     sock_packet;    /* using Linux 2.0 compatible interface */
  68         int     timeout;        /* timeout specified to pcap_open_live */
  69         int     promisc;        /* running in promiscuous mode */
  70         char    *device;        /* device name */
  71 #endif
  72 };
  73
  74 struct pcap {
  75         int fd;
  76         int snapshot;
  77         int linktype;
  78         int tzoff;              /* timezone offset */
  79         int offset;             /* offset for proper alignment */
  80
  81         struct pcap_sf sf;
  82         struct pcap_md md;
  83
  84         /*
  85          * Read buffer.
  86          */
  87         int bufsize;
  88         u_char *buffer;
  89         u_char *bp;
  90         int cc;
  91
  92         /*
  93          * Place holder for pcap_next().
  94          */
  95         u_char *pkt;
  96
  97
  98         /*
  99          * Placeholder for filter code if bpf not in kernel.
 100          */
 101         struct bpf_program fcode;
 102
 103         char errbuf[PCAP_ERRBUF_SIZE];
 104 };
 105
 106 /*
 107  * This is a timeval as stored in disk in a dumpfile.
 108  * It has to use the same types everywhere, independent of the actual
 109  * `struct timeval'
 110  */
 111
 112 struct pcap_timeval {
 113     bpf_int32 tv_sec;           /* seconds */
 114     bpf_int32 tv_usec;          /* microseconds */
 115 };
 116
 117 /*
 118  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 119  *
 120  * Do not change the format of this structure, in any way (this includes
 121  * changes that only affect the length of fields in this structure),
 122  * and do not make the time stamp anything other than seconds and
 123  * microseconds (e.g., seconds and nanoseconds).  Instead:
 124  *
 125  *      introduce a new structure for the new format;
 126  *
 127  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 128  *      magic number for your new capture file format, and, when
 129  *      you get the new magic number, put it in "savefile.c";
 130  *
 131  *      use that magic number for save files with the changed record
 132  *      header;
 133  *
 134  *      make the code in "savefile.c" capable of reading files with
 135  *      the old record header as well as files with the new record header
 136  *      (using the magic number to determine the header format).
 137  *
 138  * Then supply the changes to "patches@tcpdump.org", so that future
 139  * versions of libpcap and programs that use it (such as tcpdump) will
 140  * be able to read your new capture file format.
 141  */
 142
 143 struct pcap_sf_pkthdr {
 144     struct pcap_timeval ts;     /* time stamp */
 145     bpf_u_int32 caplen;         /* length of portion present */
 146     bpf_u_int32 len;            /* length this packet (off wire) */
 147 };
 148
 149 /*
 150  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 151  * by some patched versions of libpcap (e.g. the ones in Red
 152  * Hat Linux 6.1 and 6.2).
 153  *
 154  * Do not change the format of this structure, in any way (this includes
 155  * changes that only affect the length of fields in this structure).
 156  * Instead, introduce a new structure, as per the above.
 157  */
 158
 159 struct pcap_sf_patched_pkthdr {
 160     struct pcap_timeval ts;     /* time stamp */
 161     bpf_u_int32 caplen;         /* length of portion present */
 162     bpf_u_int32 len;            /* length this packet (off wire) */
 163     int         index;
 164     unsigned short protocol;
 165     unsigned char pkt_type;
 166 };
 167
 168 int     yylex(void);
 169
 170 #ifndef min
 171 #define min(a, b) ((a) > (b) ? (b) : (a))
 172 #endif
 173
 174 /* XXX should these be in pcap.h? */
 175 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 176 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 177
 178 /*
 179  * 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
 180  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 181  */
 182 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
 183 #define       PCAP_FDDIPAD 3
 184 #endif
 185
 186 #ifndef HAVE_STRLCPY
 187 #define strlcpy(x, y, z) \
 188         (strncpy((x), (y), (z)), \
 189          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 190          strlen((y)))
 191 #endif
 192
 193 /* XXX */
 194 extern  int pcap_fddipad;
 195
 196 #ifdef __cplusplus
 197 }
 198 #endif
 199
 200 #endif