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   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 1.55 2003-11-04 07:05:34 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 typedef enum {
  53         NOT_SWAPPED,
  54         SWAPPED,
  55         MAYBE_SWAPPED
  56 } swapped_type_t;
  57
  58 struct pcap_sf {
  59         FILE *rfile;
  60         int swapped;
  61         int hdrsize;
  62         swapped_type_t lengths_swapped;
  63         int version_major;
  64         int version_minor;
  65         u_char *base;
  66 };
  67
  68 struct pcap_md {
  69         struct pcap_stat stat;
  70         /*XXX*/
  71         int use_bpf;            /* using kernel filter */
  72         u_long  TotPkts;        /* can't oflow for 79 hrs on ether */
  73         u_long  TotAccepted;    /* count accepted by filter */
  74         u_long  TotDrops;       /* count of dropped packets */
  75         long    TotMissed;      /* missed by i/f during this run */
  76         long    OrigMissed;     /* missed by i/f before this run */
  77 #ifdef linux
  78         int     sock_packet;    /* using Linux 2.0 compatible interface */
  79         int     timeout;        /* timeout specified to pcap_open_live */
  80         int     clear_promisc;  /* must clear promiscuous mode when we close */
  81         int     cooked;         /* using SOCK_DGRAM rather than SOCK_RAW */
  82         int     lo_ifindex;     /* interface index of the loopback device */
  83         char    *device;        /* device name */
  84         struct pcap *next;      /* list of open promiscuous sock_packet pcaps */
  85 #endif
  86
  87 #ifdef HAVE_DAG_API
  88         void    *dag_mem_base;  /* DAG card memory base address */
  89         u_int   dag_mem_bottom; /* DAG card current memory bottom pointer */
  90         u_int   dag_mem_top;    /* DAG card current memory top pointer */
  91         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
  92 #endif
  93 };
  94
  95 struct pcap {
  96 #ifdef WIN32
  97         ADAPTER *adapter;
  98         LPPACKET Packet;
  99         int timeout;
 100         int nonblock;
 101 #else
 102         int fd;
 103 #endif /* WIN32 */
 104         int snapshot;
 105         int linktype;
 106         int tzoff;              /* timezone offset */
 107         int offset;             /* offset for proper alignment */
 108
 109         int break_loop;         /* flag set to force break from packet-reading loop */
 110
 111         struct pcap_sf sf;
 112         struct pcap_md md;
 113
 114         /*
 115          * Read buffer.
 116          */
 117         int bufsize;
 118         u_char *buffer;
 119         u_char *bp;
 120         int cc;
 121
 122         /*
 123          * Place holder for pcap_next().
 124          */
 125         u_char *pkt;
 126
 127         /*
 128          * Methods.
 129          */
 130         int     (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
 131         int     (*setfilter_op)(pcap_t *, struct bpf_program *);
 132         int     (*set_datalink_op)(pcap_t *, int);
 133         int     (*stats_op)(pcap_t *, struct pcap_stat *);
 134         void    (*close_op)(pcap_t *);
 135
 136         /*
 137          * Placeholder for filter code if bpf not in kernel.
 138          */
 139         struct bpf_program fcode;
 140
 141         char errbuf[PCAP_ERRBUF_SIZE + 1];
 142         int dlt_count;
 143         int *dlt_list;
 144
 145         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 146 };
 147
 148 /*
 149  * This is a timeval as stored in disk in a dumpfile.
 150  * It has to use the same types everywhere, independent of the actual
 151  * `struct timeval'
 152  */
 153
 154 struct pcap_timeval {
 155     bpf_int32 tv_sec;           /* seconds */
 156     bpf_int32 tv_usec;          /* microseconds */
 157 };
 158
 159 /*
 160  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 161  *
 162  * Do not change the format of this structure, in any way (this includes
 163  * changes that only affect the length of fields in this structure),
 164  * and do not make the time stamp anything other than seconds and
 165  * microseconds (e.g., seconds and nanoseconds).  Instead:
 166  *
 167  *      introduce a new structure for the new format;
 168  *
 169  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 170  *      magic number for your new capture file format, and, when
 171  *      you get the new magic number, put it in "savefile.c";
 172  *
 173  *      use that magic number for save files with the changed record
 174  *      header;
 175  *
 176  *      make the code in "savefile.c" capable of reading files with
 177  *      the old record header as well as files with the new record header
 178  *      (using the magic number to determine the header format).
 179  *
 180  * Then supply the changes to "patches@tcpdump.org", so that future
 181  * versions of libpcap and programs that use it (such as tcpdump) will
 182  * be able to read your new capture file format.
 183  */
 184
 185 struct pcap_sf_pkthdr {
 186     struct pcap_timeval ts;     /* time stamp */
 187     bpf_u_int32 caplen;         /* length of portion present */
 188     bpf_u_int32 len;            /* length this packet (off wire) */
 189 };
 190
 191 /*
 192  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 193  * by some patched versions of libpcap (e.g. the ones in Red
 194  * Hat Linux 6.1 and 6.2).
 195  *
 196  * Do not change the format of this structure, in any way (this includes
 197  * changes that only affect the length of fields in this structure).
 198  * Instead, introduce a new structure, as per the above.
 199  */
 200
 201 struct pcap_sf_patched_pkthdr {
 202     struct pcap_timeval ts;     /* time stamp */
 203     bpf_u_int32 caplen;         /* length of portion present */
 204     bpf_u_int32 len;            /* length this packet (off wire) */
 205     int         index;
 206     unsigned short protocol;
 207     unsigned char pkt_type;
 208 };
 209
 210 int     yylex(void);
 211
 212 #ifndef min
 213 #define min(a, b) ((a) > (b) ? (b) : (a))
 214 #endif
 215
 216 /* XXX should these be in pcap.h? */
 217 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 218 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 219
 220
 221 /*
 222  * 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
 223  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 224  */
 225 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
 226 #define       PCAP_FDDIPAD 3
 227 #endif
 228
 229 #ifndef HAVE_STRLCPY
 230 #define strlcpy(x, y, z) \
 231         (strncpy((x), (y), (z)), \
 232          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 233          strlen((y)))
 234 #endif
 235
 236 /*
 237  * Internal interface for "pcap_set_datalink()".  Attempts to set the
 238  * link-layer type to the specified type; if that fails, returns -1.
 239  * (On platforms that don't support setting it at all, this can just
 240  * return 0 - on those platforms, "pcap_set_datalink()" has already
 241  * checked whether the DLT_ value is the one the device supports.
 242  */
 243 int     pcap_set_datalink_platform(pcap_t *, int);
 244
 245 /*
 246  * Internal interfaces for "pcap_findalldevs()".
 247  *
 248  * "pcap_platform_finddevs()" is a platform-dependent routine to
 249  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 250  * "getifaddrs()", etc..
 251  *
 252  * "pcap_add_if()" adds an interface to the list of interfaces.
 253  */
 254 int     pcap_platform_finddevs(pcap_if_t **, char *);
 255 int     add_addr_to_iflist(pcap_if_t **, char *, u_int, struct sockaddr *,
 256             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 257             struct sockaddr *, size_t, char *);
 258 int     pcap_add_if(pcap_if_t **, char *, u_int, const char *, char *);
 259 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 260 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 261             const char *, char *);
 262
 263 #ifdef WIN32
 264 char    *pcap_win32strerror(void);
 265 #endif
 266
 267 /* XXX */
 268 extern  int pcap_fddipad;
 269
 270 int     install_bpf_program(pcap_t *, struct bpf_program *);
 271
 272 int     pcap_strcasecmp(const char *, const char *);
 273
 274 #ifdef __cplusplus
 275 }
 276 #endif
 277
 278 #endif