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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 1.66 2004-12-15 00:25:09 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 #ifdef PCAP_FDDIPAD
 116         int fddipad;
 117 #endif
 118
 119         struct pcap_sf sf;
 120         struct pcap_md md;
 121
 122         /*
 123          * Read buffer.
 124          */
 125         int bufsize;
 126         u_char *buffer;
 127         u_char *bp;
 128         int cc;
 129
 130         /*
 131          * Place holder for pcap_next().
 132          */
 133         u_char *pkt;
 134
 135         /*
 136          * Methods.
 137          */
 138         int     (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
 139         int     (*inject_op)(pcap_t *, const void *, size_t);
 140         int     (*setfilter_op)(pcap_t *, struct bpf_program *);
 141         int     (*set_datalink_op)(pcap_t *, int);
 142         int     (*getnonblock_op)(pcap_t *, char *);
 143         int     (*setnonblock_op)(pcap_t *, int, char *);
 144         int     (*stats_op)(pcap_t *, struct pcap_stat *);
 145         void    (*close_op)(pcap_t *);
 146
 147         /*
 148          * Placeholder for filter code if bpf not in kernel.
 149          */
 150         struct bpf_program fcode;
 151
 152         char errbuf[PCAP_ERRBUF_SIZE + 1];
 153         int dlt_count;
 154         u_int *dlt_list;
 155
 156         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 157 };
 158
 159 /*
 160  * This is a timeval as stored in disk in a dumpfile.
 161  * It has to use the same types everywhere, independent of the actual
 162  * `struct timeval'
 163  */
 164
 165 struct pcap_timeval {
 166     bpf_int32 tv_sec;           /* seconds */
 167     bpf_int32 tv_usec;          /* microseconds */
 168 };
 169
 170 /*
 171  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 172  *
 173  * Do not change the format of this structure, in any way (this includes
 174  * changes that only affect the length of fields in this structure),
 175  * and do not make the time stamp anything other than seconds and
 176  * microseconds (e.g., seconds and nanoseconds).  Instead:
 177  *
 178  *      introduce a new structure for the new format;
 179  *
 180  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 181  *      magic number for your new capture file format, and, when
 182  *      you get the new magic number, put it in "savefile.c";
 183  *
 184  *      use that magic number for save files with the changed record
 185  *      header;
 186  *
 187  *      make the code in "savefile.c" capable of reading files with
 188  *      the old record header as well as files with the new record header
 189  *      (using the magic number to determine the header format).
 190  *
 191  * Then supply the changes to "patches@tcpdump.org", so that future
 192  * versions of libpcap and programs that use it (such as tcpdump) will
 193  * be able to read your new capture file format.
 194  */
 195
 196 struct pcap_sf_pkthdr {
 197     struct pcap_timeval ts;     /* time stamp */
 198     bpf_u_int32 caplen;         /* length of portion present */
 199     bpf_u_int32 len;            /* length this packet (off wire) */
 200 };
 201
 202 /*
 203  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 204  * by some patched versions of libpcap (e.g. the ones in Red
 205  * Hat Linux 6.1 and 6.2).
 206  *
 207  * Do not change the format of this structure, in any way (this includes
 208  * changes that only affect the length of fields in this structure).
 209  * Instead, introduce a new structure, as per the above.
 210  */
 211
 212 struct pcap_sf_patched_pkthdr {
 213     struct pcap_timeval ts;     /* time stamp */
 214     bpf_u_int32 caplen;         /* length of portion present */
 215     bpf_u_int32 len;            /* length this packet (off wire) */
 216     int         index;
 217     unsigned short protocol;
 218     unsigned char pkt_type;
 219 };
 220
 221 int     yylex(void);
 222
 223 #ifndef min
 224 #define min(a, b) ((a) > (b) ? (b) : (a))
 225 #endif
 226
 227 /* XXX should these be in pcap.h? */
 228 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 229 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 230
 231
 232 /*
 233  * 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
 234  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 235  */
 236 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
 237 #define       PCAP_FDDIPAD 3
 238 #endif
 239
 240 #ifndef HAVE_STRLCPY
 241 #define strlcpy(x, y, z) \
 242         (strncpy((x), (y), (z)), \
 243          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 244          strlen((y)))
 245 #endif
 246
 247 #include <stdarg.h>
 248
 249 #if !defined(HAVE_SNPRINTF)
 250 #define snprintf pcap_snprintf
 251 extern int snprintf (char *, size_t, const char *, ...);
 252 #endif
 253
 254 #if !defined(HAVE_VSNPRINTF)
 255 #define vsnprintf pcap_vsnprintf
 256 extern int vsnprintf (char *, size_t, const char *, va_list ap);
 257 #endif
 258
 259 /*
 260  * Routines that most pcap implementations can use for non-blocking mode.
 261  */
 262 #ifndef WIN32
 263 int     pcap_getnonblock_fd(pcap_t *, char *);
 264 int     pcap_setnonblock_fd(pcap_t *p, int, char *);
 265 #endif
 266
 267 void    pcap_close_common(pcap_t *);
 268
 269 /*
 270  * Internal interfaces for "pcap_findalldevs()".
 271  *
 272  * "pcap_platform_finddevs()" is a platform-dependent routine to
 273  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 274  * "getifaddrs()", etc..
 275  *
 276  * "pcap_add_if()" adds an interface to the list of interfaces.
 277  */
 278 int     pcap_platform_finddevs(pcap_if_t **, char *);
 279 int     add_addr_to_iflist(pcap_if_t **, char *, u_int, struct sockaddr *,
 280             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 281             struct sockaddr *, size_t, char *);
 282 int     pcap_add_if(pcap_if_t **, char *, u_int, const char *, char *);
 283 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 284 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 285             const char *, char *);
 286
 287 #ifdef WIN32
 288 char    *pcap_win32strerror(void);
 289 #endif
 290
 291 int     install_bpf_program(pcap_t *, struct bpf_program *);
 292
 293 int     pcap_strcasecmp(const char *, const char *);
 294
 295 #ifdef __cplusplus
 296 }
 297 #endif
 298
 299 #endif