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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 1.64 2004-04-07 18:41:00 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         char    *device;        /* device name */
  78 #ifdef linux
  79         int     sock_packet;    /* using Linux 2.0 compatible interface */
  80         int     timeout;        /* timeout specified to pcap_open_live */
  81         int     clear_promisc;  /* must clear promiscuous mode when we close */
  82         int     cooked;         /* using SOCK_DGRAM rather than SOCK_RAW */
  83         int     ifindex;        /* interface index of device we're bound to */
  84         int     lo_ifindex;     /* interface index of the loopback device */
  85         struct pcap *next;      /* list of open promiscuous sock_packet pcaps */
  86 #endif
  87
  88 #ifdef HAVE_DAG_API
  89         void    *dag_mem_base;  /* DAG card memory base address */
  90         u_int   dag_mem_bottom; /* DAG card current memory bottom pointer */
  91         u_int   dag_mem_top;    /* DAG card current memory top pointer */
  92         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
  93         int     dag_offset_flags; /* Flags to pass to dag_offset(). */
  94 #endif
  95 };
  96
  97 struct pcap {
  98 #ifdef WIN32
  99         ADAPTER *adapter;
 100         LPPACKET Packet;
 101         int timeout;
 102         int nonblock;
 103 #else
 104         int fd;
 105         int selectable_fd;
 106         int send_fd;
 107 #endif /* WIN32 */
 108         int snapshot;
 109         int linktype;
 110         int tzoff;              /* timezone offset */
 111         int offset;             /* offset for proper alignment */
 112
 113         int break_loop;         /* flag set to force break from packet-reading loop */
 114
 115         struct pcap_sf sf;
 116         struct pcap_md md;
 117
 118         /*
 119          * Read buffer.
 120          */
 121         int bufsize;
 122         u_char *buffer;
 123         u_char *bp;
 124         int cc;
 125
 126         /*
 127          * Place holder for pcap_next().
 128          */
 129         u_char *pkt;
 130
 131         /*
 132          * Methods.
 133          */
 134         int     (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
 135         int     (*inject_op)(pcap_t *, const void *, size_t);
 136         int     (*setfilter_op)(pcap_t *, struct bpf_program *);
 137         int     (*set_datalink_op)(pcap_t *, int);
 138         int     (*getnonblock_op)(pcap_t *, char *);
 139         int     (*setnonblock_op)(pcap_t *, int, char *);
 140         int     (*stats_op)(pcap_t *, struct pcap_stat *);
 141         void    (*close_op)(pcap_t *);
 142
 143         /*
 144          * Placeholder for filter code if bpf not in kernel.
 145          */
 146         struct bpf_program fcode;
 147
 148         char errbuf[PCAP_ERRBUF_SIZE + 1];
 149         int dlt_count;
 150         u_int *dlt_list;
 151
 152         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 153 };
 154
 155 /*
 156  * This is a timeval as stored in disk in a dumpfile.
 157  * It has to use the same types everywhere, independent of the actual
 158  * `struct timeval'
 159  */
 160
 161 struct pcap_timeval {
 162     bpf_int32 tv_sec;           /* seconds */
 163     bpf_int32 tv_usec;          /* microseconds */
 164 };
 165
 166 /*
 167  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 168  *
 169  * Do not change the format of this structure, in any way (this includes
 170  * changes that only affect the length of fields in this structure),
 171  * and do not make the time stamp anything other than seconds and
 172  * microseconds (e.g., seconds and nanoseconds).  Instead:
 173  *
 174  *      introduce a new structure for the new format;
 175  *
 176  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 177  *      magic number for your new capture file format, and, when
 178  *      you get the new magic number, put it in "savefile.c";
 179  *
 180  *      use that magic number for save files with the changed record
 181  *      header;
 182  *
 183  *      make the code in "savefile.c" capable of reading files with
 184  *      the old record header as well as files with the new record header
 185  *      (using the magic number to determine the header format).
 186  *
 187  * Then supply the changes to "patches@tcpdump.org", so that future
 188  * versions of libpcap and programs that use it (such as tcpdump) will
 189  * be able to read your new capture file format.
 190  */
 191
 192 struct pcap_sf_pkthdr {
 193     struct pcap_timeval ts;     /* time stamp */
 194     bpf_u_int32 caplen;         /* length of portion present */
 195     bpf_u_int32 len;            /* length this packet (off wire) */
 196 };
 197
 198 /*
 199  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 200  * by some patched versions of libpcap (e.g. the ones in Red
 201  * Hat Linux 6.1 and 6.2).
 202  *
 203  * Do not change the format of this structure, in any way (this includes
 204  * changes that only affect the length of fields in this structure).
 205  * Instead, introduce a new structure, as per the above.
 206  */
 207
 208 struct pcap_sf_patched_pkthdr {
 209     struct pcap_timeval ts;     /* time stamp */
 210     bpf_u_int32 caplen;         /* length of portion present */
 211     bpf_u_int32 len;            /* length this packet (off wire) */
 212     int         index;
 213     unsigned short protocol;
 214     unsigned char pkt_type;
 215 };
 216
 217 int     yylex(void);
 218
 219 #ifndef min
 220 #define min(a, b) ((a) > (b) ? (b) : (a))
 221 #endif
 222
 223 /* XXX should these be in pcap.h? */
 224 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 225 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 226
 227
 228 /*
 229  * 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
 230  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 231  */
 232 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
 233 #define       PCAP_FDDIPAD 3
 234 #endif
 235
 236 #ifndef HAVE_STRLCPY
 237 #define strlcpy(x, y, z) \
 238         (strncpy((x), (y), (z)), \
 239          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 240          strlen((y)))
 241 #endif
 242
 243 #include <stdarg.h>
 244
 245 #if !defined(HAVE_SNPRINTF)
 246 #define snprintf pcap_snprintf
 247 extern int snprintf (char *, size_t, const char *, ...);
 248 #endif
 249
 250 #if !defined(HAVE_VSNPRINTF)
 251 #define vsnprintf pcap_vsnprintf
 252 extern int vsnprintf (char *, size_t, const char *, va_list ap);
 253 #endif
 254
 255 /*
 256  * Routines that most pcap implementations can use for non-blocking mode.
 257  */
 258 #ifndef WIN32
 259 int     pcap_getnonblock_fd(pcap_t *, char *);
 260 int     pcap_setnonblock_fd(pcap_t *p, int, char *);
 261 #endif
 262
 263 /*
 264  * Internal interfaces for "pcap_findalldevs()".
 265  *
 266  * "pcap_platform_finddevs()" is a platform-dependent routine to
 267  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 268  * "getifaddrs()", etc..
 269  *
 270  * "pcap_add_if()" adds an interface to the list of interfaces.
 271  */
 272 int     pcap_platform_finddevs(pcap_if_t **, char *);
 273 int     add_addr_to_iflist(pcap_if_t **, char *, u_int, struct sockaddr *,
 274             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 275             struct sockaddr *, size_t, char *);
 276 int     pcap_add_if(pcap_if_t **, char *, u_int, const char *, char *);
 277 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 278 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 279             const char *, char *);
 280
 281 #ifdef WIN32
 282 char    *pcap_win32strerror(void);
 283 #endif
 284
 285 /* XXX */
 286 extern  int pcap_fddipad;
 287
 288 int     install_bpf_program(pcap_t *, struct bpf_program *);
 289
 290 int     pcap_strcasecmp(const char *, const char *);
 291
 292 #ifdef __cplusplus
 293 }
 294 #endif
 295
 296 #endif