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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 1.53 2003-07-25 06:36:23 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 #ifdef HAVE_DAG_API
  81         void    *dag_mem_base;  /* DAG card memory base address */
  82         u_int   dag_mem_bottom; /* DAG card current memory bottom pointer */
  83         u_int   dag_mem_top;    /* DAG card current memory top pointer */
  84         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
  85 #endif
  86 };
  87
  88 struct pcap {
  89 #ifdef WIN32
  90         ADAPTER *adapter;
  91         LPPACKET Packet;
  92         int timeout;
  93         int nonblock;
  94 #else
  95         int fd;
  96 #endif /* WIN32 */
  97         int snapshot;
  98         int linktype;
  99         int tzoff;              /* timezone offset */
 100         int offset;             /* offset for proper alignment */
 101
 102         struct pcap_sf sf;
 103         struct pcap_md md;
 104
 105         /*
 106          * Read buffer.
 107          */
 108         int bufsize;
 109         u_char *buffer;
 110         u_char *bp;
 111         int cc;
 112
 113         /*
 114          * Place holder for pcap_next().
 115          */
 116         u_char *pkt;
 117
 118         /*
 119          * Methods.
 120          */
 121         int     (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
 122         int     (*setfilter_op)(pcap_t *, struct bpf_program *);
 123         int     (*set_datalink_op)(pcap_t *, int);
 124         int     (*stats_op)(pcap_t *, struct pcap_stat *);
 125         void    (*close_op)(pcap_t *);
 126
 127         /*
 128          * Placeholder for filter code if bpf not in kernel.
 129          */
 130         struct bpf_program fcode;
 131
 132         char errbuf[PCAP_ERRBUF_SIZE + 1];
 133         int dlt_count;
 134         int *dlt_list;
 135
 136         struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
 137 };
 138
 139 /*
 140  * This is a timeval as stored in disk in a dumpfile.
 141  * It has to use the same types everywhere, independent of the actual
 142  * `struct timeval'
 143  */
 144
 145 struct pcap_timeval {
 146     bpf_int32 tv_sec;           /* seconds */
 147     bpf_int32 tv_usec;          /* microseconds */
 148 };
 149
 150 /*
 151  * How a `pcap_pkthdr' is actually stored in the dumpfile.
 152  *
 153  * Do not change the format of this structure, in any way (this includes
 154  * changes that only affect the length of fields in this structure),
 155  * and do not make the time stamp anything other than seconds and
 156  * microseconds (e.g., seconds and nanoseconds).  Instead:
 157  *
 158  *      introduce a new structure for the new format;
 159  *
 160  *      send mail to "tcpdump-workers@tcpdump.org", requesting a new
 161  *      magic number for your new capture file format, and, when
 162  *      you get the new magic number, put it in "savefile.c";
 163  *
 164  *      use that magic number for save files with the changed record
 165  *      header;
 166  *
 167  *      make the code in "savefile.c" capable of reading files with
 168  *      the old record header as well as files with the new record header
 169  *      (using the magic number to determine the header format).
 170  *
 171  * Then supply the changes to "patches@tcpdump.org", so that future
 172  * versions of libpcap and programs that use it (such as tcpdump) will
 173  * be able to read your new capture file format.
 174  */
 175
 176 struct pcap_sf_pkthdr {
 177     struct pcap_timeval ts;     /* time stamp */
 178     bpf_u_int32 caplen;         /* length of portion present */
 179     bpf_u_int32 len;            /* length this packet (off wire) */
 180 };
 181
 182 /*
 183  * How a `pcap_pkthdr' is actually stored in dumpfiles written
 184  * by some patched versions of libpcap (e.g. the ones in Red
 185  * Hat Linux 6.1 and 6.2).
 186  *
 187  * Do not change the format of this structure, in any way (this includes
 188  * changes that only affect the length of fields in this structure).
 189  * Instead, introduce a new structure, as per the above.
 190  */
 191
 192 struct pcap_sf_patched_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     int         index;
 197     unsigned short protocol;
 198     unsigned char pkt_type;
 199 };
 200
 201 int     yylex(void);
 202
 203 #ifndef min
 204 #define min(a, b) ((a) > (b) ? (b) : (a))
 205 #endif
 206
 207 /* XXX should these be in pcap.h? */
 208 int     pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
 209 int     pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
 210
 211
 212 /*
 213  * 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
 214  * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
 215  */
 216 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
 217 #define       PCAP_FDDIPAD 3
 218 #endif
 219
 220 #ifndef HAVE_STRLCPY
 221 #define strlcpy(x, y, z) \
 222         (strncpy((x), (y), (z)), \
 223          ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
 224          strlen((y)))
 225 #endif
 226
 227 /*
 228  * Internal interface for "pcap_set_datalink()".  Attempts to set the
 229  * link-layer type to the specified type; if that fails, returns -1.
 230  * (On platforms that don't support setting it at all, this can just
 231  * return 0 - on those platforms, "pcap_set_datalink()" has already
 232  * checked whether the DLT_ value is the one the device supports.
 233  */
 234 int     pcap_set_datalink_platform(pcap_t *, int);
 235
 236 /*
 237  * Internal interfaces for "pcap_findalldevs()".
 238  *
 239  * "pcap_platform_finddevs()" is a platform-dependent routine to
 240  * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
 241  * "getifaddrs()", etc..
 242  *
 243  * "pcap_add_if()" adds an interface to the list of interfaces.
 244  */
 245 int     pcap_platform_finddevs(pcap_if_t **, char *);
 246 int     add_addr_to_iflist(pcap_if_t **, char *, u_int, struct sockaddr *,
 247             size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
 248             struct sockaddr *, size_t, char *);
 249 int     pcap_add_if(pcap_if_t **, char *, u_int, const char *, char *);
 250 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
 251 int     add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
 252             const char *, char *);
 253
 254 #ifdef WIN32
 255 char    *pcap_win32strerror(void);
 256 #endif
 257
 258 /* XXX */
 259 extern  int pcap_fddipad;
 260
 261 int     install_bpf_program(pcap_t *, struct bpf_program *);
 262
 263 int     pcap_strcasecmp(const char *, const char *);
 264
 265 #ifdef __cplusplus
 266 }
 267 #endif
 268
 269 #endif