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 1.25 2000-07-18 03:43:47 guy Exp $ (LBL)
  34  */
  35
  36 #ifndef pcap_int_h
  37 #define pcap_int_h
  38
  39 #include <pcap.h>
  40
  41 /*
  42  * Savefile
  43  */
  44 struct pcap_sf {
  45         FILE *rfile;
  46         int swapped;
  47         int hdrsize;
  48         int version_major;
  49         int version_minor;
  50         u_char *base;
  51 };
  52
  53 struct pcap_md {
  54         struct pcap_stat stat;
  55         /*XXX*/
  56         int use_bpf;            /* using kernel filter */
  57         u_long  TotPkts;        /* can't oflow for 79 hrs on ether */
  58         u_long  TotAccepted;    /* count accepted by filter */
  59         u_long  TotDrops;       /* count of dropped packets */
  60         long    TotMissed;      /* missed by i/f during this run */
  61         long    OrigMissed;     /* missed by i/f before this run */
  62 #ifdef linux
  63         int     sock_packet;    /* using Linux 2.0 compatible interface */
  64         int     timeout;        /* timeout specified to pcap_open_live */
  65         int     promisc;        /* running in promiscuous mode */
  66         char    *device;        /* device name */
  67 #endif
  68 };
  69
  70 struct pcap {
  71         int fd;
  72         int snapshot;
  73         int linktype;
  74         int tzoff;              /* timezone offset */
  75         int offset;             /* offset for proper alignment */
  76
  77         struct pcap_sf sf;
  78         struct pcap_md md;
  79
  80         /*
  81          * Read buffer.
  82          */
  83         int bufsize;
  84         u_char *buffer;
  85         u_char *bp;
  86         int cc;
  87
  88         /*
  89          * Place holder for pcap_next().
  90          */
  91         u_char *pkt;
  92
  93
  94         /*
  95          * Placeholder for filter code if bpf not in kernel.
  96          */
  97         struct bpf_program fcode;
  98
  99         char errbuf[PCAP_ERRBUF_SIZE];
 100 };
 101
 102 /*
 103  * This is a timeval as stored in disk in a dumpfile.
 104  * It has to use the same types everywhere, independent of the actual
 105  * `struct timeval'
 106  */
 107
 108 struct pcap_timeval {
 109     bpf_int32 tv_sec;           /* seconds */
 110     bpf_int32 tv_usec;          /* microseconds */
 111 };
 112
 113 /*
 114  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 115  */
 116
 117 struct pcap_sf_pkthdr {
 118     struct pcap_timeval ts;     /* time stamp */
 119     bpf_u_int32 caplen;         /* length of portion present */
 120     bpf_u_int32 len;            /* length this packet (off wire) */
 121 };
 122
 123 /*
 124  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 125  * by some patched versions of libpcap (e.g. the ones in Red
 126  * Hat Linux 6.1 and 6.2).
 127  */
 128
 129 struct pcap_sf_patched_pkthdr {
 130     struct pcap_timeval ts;     /* time stamp */
 131     bpf_u_int32 caplen;         /* length of portion present */
 132     bpf_u_int32 len;            /* length this packet (off wire) */
 133     int         index;
 134     unsigned short protocol;
 135     unsigned char pkt_type;
 136 };
 137
 138 int     yylex(void);
 139
 140 #ifndef min
 141 #define min(a, b) ((a) > (b) ? (b) : (a))
 142 #endif
 143
 144 /* XXX should these be in pcap.h? */
 145 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 146 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 147
 148 /* Ultrix pads to make everything line up on a nice boundary */
 149 #if defined(ultrix) || defined(__alpha) || defined(__NetBSD__)
 150 #define       PCAP_FDDIPAD 3
 151 #endif
 152
 153 #ifndef HAVE_STRLCPY
 154 #define strlcpy(x, y, z) \
 155         (strncpy((x), (y), (z)), \
 156          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 157          strlen((y)))
 158 #endif
 159
 160 /* XXX */
 161 extern  int pcap_fddipad;
 162 #endif