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 1.33 2001-08-24 07:46:52 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     clear_promisc;  /* must clear promiscuous mode when we close */
  70         int     cooked;         /* using SOCK_DGRAM rather than SOCK_RAW */
  71         int     lo_ifindex;     /* interface index of the loopback device */
  72         char    *device;        /* device name */
  73         struct pcap *next;      /* list of open promiscuous sock_packet pcaps */
  74 #endif
  75 };
  76
  77 struct pcap {
  78         int fd;
  79         int snapshot;
  80         int linktype;
  81         int tzoff;              /* timezone offset */
  82         int offset;             /* offset for proper alignment */
  83
  84         struct pcap_sf sf;
  85         struct pcap_md md;
  86
  87         /*
  88          * Read buffer.
  89          */
  90         int bufsize;
  91         u_char *buffer;
  92         u_char *bp;
  93         int cc;
  94
  95         /*
  96          * Place holder for pcap_next().
  97          */
  98         u_char *pkt;
  99
 100
 101         /*
 102          * Placeholder for filter code if bpf not in kernel.
 103          */
 104         struct bpf_program fcode;
 105
 106         char errbuf[PCAP_ERRBUF_SIZE];
 107 };
 108
 109 /*
 110  * This is a timeval as stored in disk in a dumpfile.
 111  * It has to use the same types everywhere, independent of the actual
 112  * `struct timeval'
 113  */
 114
 115 struct pcap_timeval {
 116     bpf_int32 tv_sec;           /* seconds */
 117     bpf_int32 tv_usec;          /* microseconds */
 118 };
 119
 120 /*
 121  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 122  *
 123  * Do not change the format of this structure, in any way (this includes
 124  * changes that only affect the length of fields in this structure),
 125  * and do not make the time stamp anything other than seconds and
 126  * microseconds (e.g., seconds and nanoseconds).  Instead:
 127  *
 128  *      introduce a new structure for the new format;
 129  *
 130  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 131  *      magic number for your new capture file format, and, when
 132  *      you get the new magic number, put it in "savefile.c";
 133  *
 134  *      use that magic number for save files with the changed record
 135  *      header;
 136  *
 137  *      make the code in "savefile.c" capable of reading files with
 138  *      the old record header as well as files with the new record header
 139  *      (using the magic number to determine the header format).
 140  *
 141  * Then supply the changes to "patches@tcpdump.org", so that future
 142  * versions of libpcap and programs that use it (such as tcpdump) will
 143  * be able to read your new capture file format.
 144  */
 145
 146 struct pcap_sf_pkthdr {
 147     struct pcap_timeval ts;     /* time stamp */
 148     bpf_u_int32 caplen;         /* length of portion present */
 149     bpf_u_int32 len;            /* length this packet (off wire) */
 150 };
 151
 152 /*
 153  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 154  * by some patched versions of libpcap (e.g. the ones in Red
 155  * Hat Linux 6.1 and 6.2).
 156  *
 157  * Do not change the format of this structure, in any way (this includes
 158  * changes that only affect the length of fields in this structure).
 159  * Instead, introduce a new structure, as per the above.
 160  */
 161
 162 struct pcap_sf_patched_pkthdr {
 163     struct pcap_timeval ts;     /* time stamp */
 164     bpf_u_int32 caplen;         /* length of portion present */
 165     bpf_u_int32 len;            /* length this packet (off wire) */
 166     int         index;
 167     unsigned short protocol;
 168     unsigned char pkt_type;
 169 };
 170
 171 int     yylex(void);
 172
 173 #ifndef min
 174 #define min(a, b) ((a) > (b) ? (b) : (a))
 175 #endif
 176
 177 /* XXX should these be in pcap.h? */
 178 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 179 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 180
 181 /*
 182  * 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
 183  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 184  */
 185 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
 186 #define       PCAP_FDDIPAD 3
 187 #endif
 188
 189 #ifndef HAVE_STRLCPY
 190 #define strlcpy(x, y, z) \
 191         (strncpy((x), (y), (z)), \
 192          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 193          strlen((y)))
 194 #endif
 195
 196 #ifdef linux
 197 void    pcap_close_linux(pcap_t *);
 198 #endif
 199
 200 /* XXX */
 201 extern  int pcap_fddipad;
 202
 203 int     install_bpf_program(pcap_t *, struct bpf_program *);
 204
 205 #ifdef __cplusplus
 206 }
 207 #endif
 208
 209 #endif