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 1.41 2002-12-19 09:05:46 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 /*
  50  * Savefile
  51  */
  52 struct pcap_sf {
  53         FILE *rfile;
  54         int swapped;
  55         int hdrsize;
  56         int version_major;
  57         int version_minor;
  58         u_char *base;
  59 };
  60
  61 struct pcap_md {
  62         struct pcap_stat stat;
  63         /*XXX*/
  64         int use_bpf;            /* using kernel filter */
  65         u_long  TotPkts;        /* can't oflow for 79 hrs on ether */
  66         u_long  TotAccepted;    /* count accepted by filter */
  67         u_long  TotDrops;       /* count of dropped packets */
  68         long    TotMissed;      /* missed by i/f during this run */
  69         long    OrigMissed;     /* missed by i/f before this run */
  70 #ifdef linux
  71         int     sock_packet;    /* using Linux 2.0 compatible interface */
  72         int     timeout;        /* timeout specified to pcap_open_live */
  73         int     clear_promisc;  /* must clear promiscuous mode when we close */
  74         int     cooked;         /* using SOCK_DGRAM rather than SOCK_RAW */
  75         int     lo_ifindex;     /* interface index of the loopback device */
  76         char    *device;        /* device name */
  77         struct pcap *next;      /* list of open promiscuous sock_packet pcaps */
  78 #endif
  79 };
  80
  81 struct pcap {
  82 #ifdef WIN32
  83         ADAPTER *adapter;
  84         LPPACKET Packet;
  85         int timeout;
  86         int nonblock;
  87 #else
  88         int fd;
  89 #endif /* WIN32 */
  90         int snapshot;
  91         int linktype;
  92         int tzoff;              /* timezone offset */
  93         int offset;             /* offset for proper alignment */
  94
  95         struct pcap_sf sf;
  96         struct pcap_md md;
  97
  98         /*
  99          * Read buffer.
 100          */
 101         int bufsize;
 102         u_char *buffer;
 103         u_char *bp;
 104         int cc;
 105
 106         /*
 107          * Place holder for pcap_next().
 108          */
 109         u_char *pkt;
 110
 111
 112         /*
 113          * Placeholder for filter code if bpf not in kernel.
 114          */
 115         struct bpf_program fcode;
 116
 117         char errbuf[PCAP_ERRBUF_SIZE + 1];
 118         int dlt_count;
 119         int *dlt_list;
 120 };
 121
 122 /*
 123  * This is a timeval as stored in disk in a dumpfile.
 124  * It has to use the same types everywhere, independent of the actual
 125  * `struct timeval'
 126  */
 127
 128 struct pcap_timeval {
 129     bpf_int32 tv_sec;           /* seconds */
 130     bpf_int32 tv_usec;          /* microseconds */
 131 };
 132
 133 /*
 134  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 135  *
 136  * Do not change the format of this structure, in any way (this includes
 137  * changes that only affect the length of fields in this structure),
 138  * and do not make the time stamp anything other than seconds and
 139  * microseconds (e.g., seconds and nanoseconds).  Instead:
 140  *
 141  *      introduce a new structure for the new format;
 142  *
 143  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 144  *      magic number for your new capture file format, and, when
 145  *      you get the new magic number, put it in "savefile.c";
 146  *
 147  *      use that magic number for save files with the changed record
 148  *      header;
 149  *
 150  *      make the code in "savefile.c" capable of reading files with
 151  *      the old record header as well as files with the new record header
 152  *      (using the magic number to determine the header format).
 153  *
 154  * Then supply the changes to "patches@tcpdump.org", so that future
 155  * versions of libpcap and programs that use it (such as tcpdump) will
 156  * be able to read your new capture file format.
 157  */
 158
 159 struct pcap_sf_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 };
 164
 165 /*
 166  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 167  * by some patched versions of libpcap (e.g. the ones in Red
 168  * Hat Linux 6.1 and 6.2).
 169  *
 170  * Do not change the format of this structure, in any way (this includes
 171  * changes that only affect the length of fields in this structure).
 172  * Instead, introduce a new structure, as per the above.
 173  */
 174
 175 struct pcap_sf_patched_pkthdr {
 176     struct pcap_timeval ts;     /* time stamp */
 177     bpf_u_int32 caplen;         /* length of portion present */
 178     bpf_u_int32 len;            /* length this packet (off wire) */
 179     int         index;
 180     unsigned short protocol;
 181     unsigned char pkt_type;
 182 };
 183
 184 int     yylex(void);
 185
 186 #ifndef min
 187 #define min(a, b) ((a) > (b) ? (b) : (a))
 188 #endif
 189
 190 /* XXX should these be in pcap.h? */
 191 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 192 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 193
 194 #ifdef WIN32
 195 /* sf_next_packet must be exported for pcap_read_ex */
 196 int sf_next_packet(pcap_t *, struct pcap_pkthdr *, u_char *, int);
 197 #endif
 198
 199 /*
 200  * 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
 201  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 202  */
 203 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
 204 #define       PCAP_FDDIPAD 3
 205 #endif
 206
 207 #ifndef HAVE_STRLCPY
 208 #define strlcpy(x, y, z) \
 209         (strncpy((x), (y), (z)), \
 210          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 211          strlen((y)))
 212 #endif
 213
 214 /*
 215  * Internal interface for "pcap_set_datalink()".  Attempts to set the
 216  * link-layer type to the specified type; if that fails, returns -1.
 217  * (On platforms that don't support setting it at all, this can just
 218  * return 0 - on those platforms, "pcap_set_datalink()" has already
 219  * checked whether the DLT_ value is the one the device supports.
 220  */
 221 int     pcap_set_datalink_platform(pcap_t *, int);
 222
 223 /*
 224  * Internal interfaces for "pcap_findalldevs()".
 225  *
 226  * "pcap_platform_finddevs()" is a platform-dependent routine to
 227  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 228  * "getifaddrs()", etc..
 229  *
 230  * "pcap_add_if()" adds an interface to the list of interfaces.
 231  */
 232 int     pcap_platform_finddevs(pcap_if_t **, char *);
 233 int     add_addr_to_iflist(pcap_if_t **, char *, u_int, struct sockaddr *,
 234             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 235             struct sockaddr *, size_t, char *);
 236 int     pcap_add_if(pcap_if_t **, char *, u_int, const char *, char *);
 237 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 238 int     add_or_find_if(pcap_if_t **, pcap_if_t **, char *, u_int,
 239             const char *, char *);
 240
 241 #ifdef linux
 242 void    pcap_close_linux(pcap_t *);
 243 #endif
 244
 245 #ifdef WIN32
 246 char    *pcap_win32strerror(void);
 247 #endif
 248
 249 /* XXX */
 250 extern  int pcap_fddipad;
 251
 252 int     install_bpf_program(pcap_t *, struct bpf_program *);
 253
 254 #ifdef __cplusplus
 255 }
 256 #endif
 257
 258 #endif