The Tcpdump Group git mirrors - libpcap/blob - pcap1.h

   1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
   2 /*
   3  * Copyright (c) 1993, 1994, 1995, 1996, 1997
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the Computer Systems
  17  *      Engineering Group at Lawrence Berkeley Laboratory.
  18  * 4. Neither the name of the University nor of the Laboratory may be used
  19  *    to endorse or promote products derived from this software without
  20  *    specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #ifndef lib_pcap_h
  36 #define lib_pcap_h
  37
  38 #ifdef WIN32
  39 #include <pcap-stdinc.h>
  40 #else /* WIN32 */
  41 #include <sys/types.h>
  42 #include <sys/time.h>
  43 #endif /* WIN32 */
  44
  45 #ifndef PCAP_DONT_INCLUDE_PCAP_BPF_H
  46 #include <pcap/bpf.h>
  47 #endif
  48
  49 #include <stdio.h>
  50
  51 #ifdef __cplusplus
  52 extern "C" {
  53 #endif
  54
  55 #define PCAP_VERSION_MAJOR 3
  56 #define PCAP_VERSION_MINOR 0
  57
  58 #define PCAP_ERRBUF_SIZE 256
  59
  60 /*
  61  * Compatibility for systems that have a bpf.h that
  62  * predates the bpf typedefs for 64-bit support.
  63  */
  64 #if BPF_RELEASE - 0 < 199406
  65 typedef int bpf_int32;
  66 typedef u_int bpf_u_int32;
  67 #endif
  68
  69 typedef struct pcap pcap_t;
  70 typedef struct pcap_dumper pcap_dumper_t;
  71 typedef struct pcap_if pcap_if_t;
  72 typedef struct pcap_addr pcap_addr_t;
  73
  74 /*
  75  * The first record in the file contains saved values for some
  76  * of the flags used in the printout phases of tcpdump.
  77  * Many fields here are 32 bit ints so compilers won't insert unwanted
  78  * padding; these files need to be interchangeable across architectures.
  79  *
  80  * Do not change the layout of this structure, in any way (this includes
  81  * changes that only affect the length of fields in this structure).
  82  *
  83  * Also, do not change the interpretation of any of the members of this
  84  * structure, in any way (this includes using values other than
  85  * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
  86  * field).
  87  *
  88  * Instead:
  89  *
  90  *      introduce a new structure for the new format, if the layout
  91  *      of the structure changed;
  92  *
  93  *      send mail to "tcpdump-workers@lists.tcpdump.org", requesting
  94  *      a new magic number for your new capture file format, and, when
  95  *      you get the new magic number, put it in "savefile.c";
  96  *
  97  *      use that magic number for save files with the changed file
  98  *      header;
  99  *
 100  *      make the code in "savefile.c" capable of reading files with
 101  *      the old file header as well as files with the new file header
 102  *      (using the magic number to determine the header format).
 103  *
 104  * Then supply the changes by forking the branch at
 105  *
 106  *      https://github.com/the-tcpdump-group/libpcap/issues
 107  *
 108  * and issuing a pull request, so that future versions of libpcap and
 109  * programs that use it (such as tcpdump) will be able to read your new
 110  * capture file format.
 111  */
 112
 113 enum pcap1_info_types {
 114         PCAP_DATACAPTURE,
 115         PCAP_TIMESTAMP,
 116         PCAP_WALLTIME,
 117         PCAP_TIMESKEW,
 118         PCAP_PROBEPLACE,              /* aka direction */
 119         PCAP_COMMENT,                 /* comment */
 120 };
 121
 122 struct pcap1_info_container {
 123         bpf_u_int32 info_len;         /* in bytes */
 124         bpf_u_int32 info_type;        /* enum pcap1_info_types */
 125         unsigned char info_data[0];
 126 };
 127
 128 struct pcap1_info_timestamp {
 129         struct pcap1_info_container pic;
 130         bpf_u_int32    nanoseconds;   /* 10^-9 of seconds */
 131         bpf_u_int32    seconds;       /* seconds since Unix epoch - GMT */
 132         bpf_u_int16    macroseconds;  /* 16 bits more of MSB of time */
 133         bpf_u_int16    sigfigs;       /* accuracy of timestamps - LSB bits */
 134 };
 135
 136 struct pcap1_info_packet {
 137         struct pcap1_info_container pic;
 138         bpf_u_int32 caplen;     /* length of portion present */
 139         bpf_u_int32 len;        /* length this packet (off wire) */
 140         bpf_u_int32 linktype;   /* data link type (LINKTYPE_*) */
 141         bpf_u_int32 ifIndex;    /* abstracted interface index */
 142         unsigned char packet_data[0];
 143 };
 144
 145 enum pcap1_probe {
 146         INBOUND  =1,
 147         OUTBOUND =2,
 148         FORWARD  =3,
 149         PREENCAP =4,
 150         POSTDECAP=5,
 151 };
 152
 153 struct pcap1_info_probe {
 154         struct pcap1_info_container pic;
 155         bpf_u_int32                 probeloc;   /* enum pcap1_probe */
 156         unsigned char               probe_desc[0];
 157 };
 158
 159 struct pcap1_info_comment {
 160         struct pcap1_info_container pic;
 161         unsigned char               comment[0];
 162 };
 163
 164 struct pcap1_packet_header {
 165         bpf_u_int32 magic;
 166         u_short     version_major;
 167         u_short     version_minor;
 168         bpf_u_int32 block_len;
 169         struct pcap1_info_container pics[0];
 170 };
 171
 172 /*
 173  * Each packet in the dump file is prepended with this generic header.
 174  * This gets around the problem of different headers for different
 175  * packet interfaces.
 176  */
 177
 178 /*
 179  * As returned by the pcap_stats()
 180  */
 181 struct pcap_stat {
 182         u_int ps_recv;          /* number of packets received */
 183         u_int ps_drop;          /* number of packets dropped */
 184         u_int ps_ifdrop;        /* drops by interface XXX not yet supported */
 185 #ifdef WIN32
 186         u_int bs_capt;          /* number of packets that reach the application */
 187 #endif /* WIN32 */
 188 };
 189
 190 /*
 191  * Item in a list of interfaces.
 192  */
 193 struct pcap_if {
 194         struct pcap_if *next;
 195         char *name;             /* name to hand to "pcap_open_live()" */
 196         char *description;      /* textual description of interface, or NULL */
 197         struct pcap_addr *addresses;
 198         bpf_u_int32 flags;      /* PCAP_IF_ interface flags */
 199 };
 200
 201 #define PCAP_IF_LOOPBACK        0x00000001      /* interface is loopback */
 202
 203 /*
 204  * Representation of an interface address.
 205  */
 206 struct pcap_addr {
 207         struct pcap_addr *next;
 208         struct sockaddr *addr;          /* address */
 209         struct sockaddr *netmask;       /* netmask for that address */
 210         struct sockaddr *broadaddr;     /* broadcast address for that address */
 211         struct sockaddr *dstaddr;       /* P2P destination address for that address */
 212 };
 213
 214 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
 215                              const u_char *);
 216
 217 char    *pcap_lookupdev(char *);
 218 int     pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
 219 pcap_t  *pcap_open_live(const char *, int, int, int, char *);
 220 pcap_t  *pcap_open_dead(int, int);
 221 pcap_t  *pcap_open_offline(const char *, char *);
 222 void    pcap_close(pcap_t *);
 223 int     pcap_loop(pcap_t *, int, pcap_handler, u_char *);
 224 int     pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
 225 const u_char*
 226         pcap_next(pcap_t *, struct pcap_pkthdr *);
 227 int     pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **);
 228 void    pcap_breakloop(pcap_t *);
 229 int     pcap_stats(pcap_t *, struct pcap_stat *);
 230 int     pcap_setfilter(pcap_t *, struct bpf_program *);
 231 int     pcap_getnonblock(pcap_t *, char *);
 232 int     pcap_setnonblock(pcap_t *, int, char *);
 233 void    pcap_perror(pcap_t *, char *);
 234 char    *pcap_strerror(int);
 235 char    *pcap_geterr(pcap_t *);
 236 int     pcap_compile(pcap_t *, struct bpf_program *, char *, int,
 237             bpf_u_int32);
 238 int     pcap_compile_nopcap(int, int, struct bpf_program *,
 239             char *, int, bpf_u_int32);
 240 void    pcap_freecode(struct bpf_program *);
 241 int     pcap_datalink(pcap_t *);
 242 int     pcap_list_datalinks(pcap_t *, int **);
 243 int     pcap_set_datalink(pcap_t *, int);
 244 int     pcap_datalink_name_to_val(const char *);
 245 const char *pcap_datalink_val_to_name(int);
 246 const char *pcap_datalink_val_to_description(int);
 247 int     pcap_snapshot(pcap_t *);
 248 int     pcap_is_swapped(pcap_t *);
 249 int     pcap_major_version(pcap_t *);
 250 int     pcap_minor_version(pcap_t *);
 251
 252 /* XXX */
 253 FILE    *pcap_file(pcap_t *);
 254 int     pcap_fileno(pcap_t *);
 255
 256 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
 257 int     pcap_dump_flush(pcap_dumper_t *);
 258 void    pcap_dump_close(pcap_dumper_t *);
 259 void    pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
 260 FILE    *pcap_dump_file(pcap_dumper_t *);
 261
 262 int     pcap_findalldevs(pcap_if_t **, char *);
 263 void    pcap_freealldevs(pcap_if_t *);
 264
 265 const char *pcap_lib_version(void);
 266
 267 /* XXX this guy lives in the bpf tree */
 268 u_int   bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
 269 int     bpf_validate(struct bpf_insn *f, int len);
 270 char    *bpf_image(struct bpf_insn *, int);
 271 void    bpf_dump(struct bpf_program *, int);
 272
 273 #ifdef WIN32
 274 /*
 275  * Win32 definitions
 276  */
 277
 278 int pcap_setbuff(pcap_t *p, int dim);
 279 int pcap_setmode(pcap_t *p, int mode);
 280 int pcap_sendpacket(pcap_t *p, u_char *buf, int size);
 281 int pcap_setmintocopy(pcap_t *p, int size);
 282
 283 #ifdef WPCAP
 284 /* Include file with the wpcap-specific extensions */
 285 #include <Win32-Extensions.h>
 286 #endif
 287
 288 #define MODE_CAPT 0
 289 #define MODE_STAT 1
 290
 291 #else
 292 /*
 293  * UN*X definitions
 294  */
 295
 296 int     pcap_get_selectable_fd(pcap_t *);
 297
 298 #endif /* WIN32 */
 299
 300 #ifdef __cplusplus
 301 }
 302 #endif
 303
 304 #endif