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 * @(#) $Header: /tcpdump/master/libpcap/pcap/pcap.h,v 1.15 2008-10-06 15:27:32 gianluca Exp $ (LBL) 35 */ 36 37 #ifndef lib_pcap_pcap_h 38 #define lib_pcap_pcap_h 39 40 #if defined(WIN32) 41 #include <pcap-stdinc.h> 42 #elif defined(MSDOS) 43 #include <sys/types.h> 44 #include <sys/socket.h> /* u_int, u_char etc. */ 45 #else /* UN*X */ 46 #include <sys/types.h> 47 #include <sys/time.h> 48 #endif /* WIN32/MSDOS/UN*X */ 49 50 #ifndef PCAP_DONT_INCLUDE_PCAP_BPF_H 51 #include <pcap/bpf.h> 52 #endif 53 54 #include <stdio.h> 55 56 #ifdef __cplusplus 57 extern "C" { 58 #endif 59 60 /* 61 * Version number of the current version of the pcap file format. 62 * 63 * NOTE: this is *NOT* the version number of the libpcap library. 64 * To fetch the version information for the version of libpcap 65 * you're using, use pcap_lib_version(). 66 */ 67 #define PCAP_VERSION_MAJOR 2 68 #define PCAP_VERSION_MINOR 4 69 70 #define PCAP_ERRBUF_SIZE 256 71 72 /* 73 * Compatibility for systems that have a bpf.h that 74 * predates the bpf typedefs for 64-bit support. 75 */ 76 #if BPF_RELEASE - 0 < 199406 77 typedef int bpf_int32; 78 typedef u_int bpf_u_int32; 79 #endif 80 81 typedef struct pcap pcap_t; 82 typedef struct pcap_dumper pcap_dumper_t; 83 typedef struct pcap_if pcap_if_t; 84 typedef struct pcap_addr pcap_addr_t; 85 86 /* 87 * The first record in the file contains saved values for some 88 * of the flags used in the printout phases of tcpdump. 89 * Many fields here are 32 bit ints so compilers won't insert unwanted 90 * padding; these files need to be interchangeable across architectures. 91 * 92 * Do not change the layout of this structure, in any way (this includes 93 * changes that only affect the length of fields in this structure). 94 * 95 * Also, do not change the interpretation of any of the members of this 96 * structure, in any way (this includes using values other than 97 * LINKTYPE_ values, as defined in "savefile.c", in the "linktype" 98 * field). 99 * 100 * Instead: 101 * 102 * introduce a new structure for the new format, if the layout 103 * of the structure changed; 104 * 105 * send mail to "tcpdump-workers@lists.tcpdump.org", requesting 106 * a new magic number for your new capture file format, and, when 107 * you get the new magic number, put it in "savefile.c"; 108 * 109 * use that magic number for save files with the changed file 110 * header; 111 * 112 * make the code in "savefile.c" capable of reading files with 113 * the old file header as well as files with the new file header 114 * (using the magic number to determine the header format). 115 * 116 * Then supply the changes by forking the branch at 117 * 118 * https://github.com/mcr/libpcap/issues 119 * 120 * and issuing a pull request, so that future versions of libpcap and 121 * programs that use it (such as tcpdump) will be able to read your new 122 * capture file format. 123 */ 124 struct pcap_file_header { 125 bpf_u_int32 magic; 126 u_short version_major; 127 u_short version_minor; 128 bpf_int32 thiszone; /* gmt to local correction */ 129 bpf_u_int32 sigfigs; /* accuracy of timestamps */ 130 bpf_u_int32 snaplen; /* max length saved portion of each pkt */ 131 bpf_u_int32 linktype; /* data link type (LINKTYPE_*) */ 132 }; 133 134 /* 135 * Macros for the value returned by pcap_datalink_ext(). 136 * 137 * If LT_FCS_LENGTH_PRESENT(x) is true, the LT_FCS_LENGTH(x) macro 138 * gives the FCS length of packets in the capture. 139 */ 140 #define LT_FCS_LENGTH_PRESENT(x) ((x) & 0x04000000) 141 #define LT_FCS_LENGTH(x) (((x) & 0xF0000000) >> 28) 142 #define LT_FCS_DATALINK_EXT(x) ((((x) & 0xF) << 28) | 0x04000000) 143 144 typedef enum { 145 PCAP_D_INOUT = 0, 146 PCAP_D_IN, 147 PCAP_D_OUT 148 } pcap_direction_t; 149 150 /* 151 * Generic per-packet information, as supplied by libpcap. 152 * 153 * The time stamp can and should be a "struct timeval", regardless of 154 * whether your system supports 32-bit tv_sec in "struct timeval", 155 * 64-bit tv_sec in "struct timeval", or both if it supports both 32-bit 156 * and 64-bit applications. The on-disk format of savefiles uses 32-bit 157 * tv_sec (and tv_usec); this structure is irrelevant to that. 32-bit 158 * and 64-bit versions of libpcap, even if they're on the same platform, 159 * should supply the appropriate version of "struct timeval", even if 160 * that's not what the underlying packet capture mechanism supplies. 161 */ 162 struct pcap_pkthdr { 163 struct timeval ts; /* time stamp */ 164 bpf_u_int32 caplen; /* length of portion present */ 165 bpf_u_int32 len; /* length this packet (off wire) */ 166 }; 167 168 /* 169 * As returned by the pcap_stats() 170 */ 171 struct pcap_stat { 172 u_int ps_recv; /* number of packets received */ 173 u_int ps_drop; /* number of packets dropped */ 174 u_int ps_ifdrop; /* drops by interface -- only supported on some platforms */ 175 #ifdef WIN32 176 u_int bs_capt; /* number of packets that reach the application */ 177 #endif /* WIN32 */ 178 }; 179 180 #ifdef MSDOS 181 /* 182 * As returned by the pcap_stats_ex() 183 */ 184 struct pcap_stat_ex { 185 u_long rx_packets; /* total packets received */ 186 u_long tx_packets; /* total packets transmitted */ 187 u_long rx_bytes; /* total bytes received */ 188 u_long tx_bytes; /* total bytes transmitted */ 189 u_long rx_errors; /* bad packets received */ 190 u_long tx_errors; /* packet transmit problems */ 191 u_long rx_dropped; /* no space in Rx buffers */ 192 u_long tx_dropped; /* no space available for Tx */ 193 u_long multicast; /* multicast packets received */ 194 u_long collisions; 195 196 /* detailed rx_errors: */ 197 u_long rx_length_errors; 198 u_long rx_over_errors; /* receiver ring buff overflow */ 199 u_long rx_crc_errors; /* recv'd pkt with crc error */ 200 u_long rx_frame_errors; /* recv'd frame alignment error */ 201 u_long rx_fifo_errors; /* recv'r fifo overrun */ 202 u_long rx_missed_errors; /* recv'r missed packet */ 203 204 /* detailed tx_errors */ 205 u_long tx_aborted_errors; 206 u_long tx_carrier_errors; 207 u_long tx_fifo_errors; 208 u_long tx_heartbeat_errors; 209 u_long tx_window_errors; 210 }; 211 #endif 212 213 /* 214 * Item in a list of interfaces. 215 */ 216 struct pcap_if { 217 struct pcap_if *next; 218 char *name; /* name to hand to "pcap_open_live()" */ 219 char *description; /* textual description of interface, or NULL */ 220 struct pcap_addr *addresses; 221 bpf_u_int32 flags; /* PCAP_IF_ interface flags */ 222 }; 223 224 #define PCAP_IF_LOOPBACK 0x00000001 /* interface is loopback */ 225 226 /* 227 * Representation of an interface address. 228 */ 229 struct pcap_addr { 230 struct pcap_addr *next; 231 struct sockaddr *addr; /* address */ 232 struct sockaddr *netmask; /* netmask for that address */ 233 struct sockaddr *broadaddr; /* broadcast address for that address */ 234 struct sockaddr *dstaddr; /* P2P destination address for that address */ 235 }; 236 237 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *, 238 const u_char *); 239 240 /* 241 * Error codes for the pcap API. 242 * These will all be negative, so you can check for the success or 243 * failure of a call that returns these codes by checking for a 244 * negative value. 245 */ 246 #define PCAP_ERROR -1 /* generic error code */ 247 #define PCAP_ERROR_BREAK -2 /* loop terminated by pcap_breakloop */ 248 #define PCAP_ERROR_NOT_ACTIVATED -3 /* the capture needs to be activated */ 249 #define PCAP_ERROR_ACTIVATED -4 /* the operation can't be performed on already activated captures */ 250 #define PCAP_ERROR_NO_SUCH_DEVICE -5 /* no such device exists */ 251 #define PCAP_ERROR_RFMON_NOTSUP -6 /* this device doesn't support rfmon (monitor) mode */ 252 #define PCAP_ERROR_NOT_RFMON -7 /* operation supported only in monitor mode */ 253 #define PCAP_ERROR_PERM_DENIED -8 /* no permission to open the device */ 254 #define PCAP_ERROR_IFACE_NOT_UP -9 /* interface isn't up */ 255 #define PCAP_ERROR_CANTSET_TSTAMP_TYPE -10 /* this device doesn't support setting the time stamp type */ 256 #define PCAP_ERROR_PROMISC_PERM_DENIED -11 /* you don't have permission to capture in promiscuous mode */ 257 258 /* 259 * Warning codes for the pcap API. 260 * These will all be positive and non-zero, so they won't look like 261 * errors. 262 */ 263 #define PCAP_WARNING 1 /* generic warning code */ 264 #define PCAP_WARNING_PROMISC_NOTSUP 2 /* this device doesn't support promiscuous mode */ 265 #define PCAP_WARNING_TSTAMP_TYPE_NOTSUP 3 /* the requested time stamp type is not supported */ 266 267 /* 268 * Value to pass to pcap_compile() as the netmask if you don't know what 269 * the netmask is. 270 */ 271 #define PCAP_NETMASK_UNKNOWN 0xffffffff 272 273 char *pcap_lookupdev(char *); 274 int pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *); 275 276 pcap_t *pcap_create(const char *, char *); 277 int pcap_set_snaplen(pcap_t *, int); 278 int pcap_set_promisc(pcap_t *, int); 279 int pcap_can_set_rfmon(pcap_t *); 280 int pcap_set_rfmon(pcap_t *, int); 281 int pcap_set_timeout(pcap_t *, int); 282 int pcap_set_tstamp_type(pcap_t *, int); 283 int pcap_set_buffer_size(pcap_t *, int); 284 int pcap_activate(pcap_t *); 285 286 int pcap_list_tstamp_types(pcap_t *, int **); 287 void pcap_free_tstamp_types(int *); 288 int pcap_tstamp_type_name_to_val(const char *); 289 const char *pcap_tstamp_type_val_to_name(int); 290 const char *pcap_tstamp_type_val_to_description(int); 291 292 /* 293 * Time stamp types. 294 * Not all systems and interfaces will necessarily support all of these. 295 * 296 * A system that supports PCAP_TSTAMP_HOST is offering time stamps 297 * provided by the host machine, rather than by the capture device, 298 * but not committing to any characteristics of the time stamp; 299 * it will not offer any of the PCAP_TSTAMP_HOST_ subtypes. 300 * 301 * PCAP_TSTAMP_HOST_LOWPREC is a time stamp, provided by the host machine, 302 * that's low-precision but relatively cheap to fetch; it's normally done 303 * using the system clock, so it's normally synchronized with times you'd 304 * fetch from system calls. 305 * 306 * PCAP_TSTAMP_HOST_HIPREC is a time stamp, provided by the host machine, 307 * that's high-precision; it might be more expensive to fetch. It might 308 * or might not be synchronized with the system clock, and might have 309 * problems with time stamps for packets received on different CPUs, 310 * depending on the platform. 311 * 312 * PCAP_TSTAMP_ADAPTER is a high-precision time stamp supplied by the 313 * capture device; it's synchronized with the system clock. 314 * 315 * PCAP_TSTAMP_ADAPTER_UNSYNCED is a high-precision time stamp supplied by 316 * the capture device; it's not synchronized with the system clock. 317 * 318 * Note that time stamps synchronized with the system clock can go 319 * backwards, as the system clock can go backwards. If a clock is 320 * not in sync with the system clock, that could be because the 321 * system clock isn't keeping accurate time, because the other 322 * clock isn't keeping accurate time, or both. 323 * 324 * Note that host-provided time stamps generally correspond to the 325 * time when the time-stamping code sees the packet; this could 326 * be some unknown amount of time after the first or last bit of 327 * the packet is received by the network adapter, due to batching 328 * of interrupts for packet arrival, queueing delays, etc.. 329 */ 330 #define PCAP_TSTAMP_HOST 0 /* host-provided, unknown characteristics */ 331 #define PCAP_TSTAMP_HOST_LOWPREC 1 /* host-provided, low precision */ 332 #define PCAP_TSTAMP_HOST_HIPREC 2 /* host-provided, high precision */ 333 #define PCAP_TSTAMP_ADAPTER 3 /* device-provided, synced with the system clock */ 334 #define PCAP_TSTAMP_ADAPTER_UNSYNCED 4 /* device-provided, not synced with the system clock */ 335 336 pcap_t *pcap_open_live(const char *, int, int, int, char *); 337 pcap_t *pcap_open_dead(int, int); 338 pcap_t *pcap_open_offline(const char *, char *); 339 #if defined(WIN32) 340 pcap_t *pcap_hopen_offline(intptr_t, char *); 341 #if !defined(LIBPCAP_EXPORTS) 342 #define pcap_fopen_offline(f,b) \ 343 pcap_hopen_offline(_get_osfhandle(_fileno(f)), b) 344 #else /*LIBPCAP_EXPORTS*/ 345 static pcap_t *pcap_fopen_offline(FILE *, char *); 346 #endif 347 #else /*WIN32*/ 348 pcap_t *pcap_fopen_offline(FILE *, char *); 349 #endif /*WIN32*/ 350 351 void pcap_close(pcap_t *); 352 int pcap_loop(pcap_t *, int, pcap_handler, u_char *); 353 int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *); 354 const u_char* 355 pcap_next(pcap_t *, struct pcap_pkthdr *); 356 int pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **); 357 void pcap_breakloop(pcap_t *); 358 int pcap_stats(pcap_t *, struct pcap_stat *); 359 int pcap_setfilter(pcap_t *, struct bpf_program *); 360 int pcap_setdirection(pcap_t *, pcap_direction_t); 361 int pcap_getnonblock(pcap_t *, char *); 362 int pcap_setnonblock(pcap_t *, int, char *); 363 int pcap_inject(pcap_t *, const void *, size_t); 364 int pcap_sendpacket(pcap_t *, const u_char *, int); 365 const char *pcap_statustostr(int); 366 const char *pcap_strerror(int); 367 char *pcap_geterr(pcap_t *); 368 void pcap_perror(pcap_t *, char *); 369 int pcap_compile(pcap_t *, struct bpf_program *, const char *, int, 370 bpf_u_int32); 371 int pcap_compile_nopcap(int, int, struct bpf_program *, 372 const char *, int, bpf_u_int32); 373 void pcap_freecode(struct bpf_program *); 374 int pcap_offline_filter(const struct bpf_program *, 375 const struct pcap_pkthdr *, const u_char *); 376 int pcap_datalink(pcap_t *); 377 int pcap_datalink_ext(pcap_t *); 378 int pcap_list_datalinks(pcap_t *, int **); 379 int pcap_set_datalink(pcap_t *, int); 380 void pcap_free_datalinks(int *); 381 int pcap_datalink_name_to_val(const char *); 382 const char *pcap_datalink_val_to_name(int); 383 const char *pcap_datalink_val_to_description(int); 384 int pcap_snapshot(pcap_t *); 385 int pcap_is_swapped(pcap_t *); 386 int pcap_major_version(pcap_t *); 387 int pcap_minor_version(pcap_t *); 388 389 /* XXX */ 390 FILE *pcap_file(pcap_t *); 391 int pcap_fileno(pcap_t *); 392 393 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *); 394 pcap_dumper_t *pcap_dump_fopen(pcap_t *, FILE *fp); 395 FILE *pcap_dump_file(pcap_dumper_t *); 396 long pcap_dump_ftell(pcap_dumper_t *); 397 int pcap_dump_flush(pcap_dumper_t *); 398 void pcap_dump_close(pcap_dumper_t *); 399 void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *); 400 401 int pcap_findalldevs(pcap_if_t **, char *); 402 void pcap_freealldevs(pcap_if_t *); 403 404 const char *pcap_lib_version(void); 405 406 /* 407 * On at least some versions of NetBSD, we don't want to declare 408 * bpf_filter() here, as it's also be declared in <net/bpf.h>, with a 409 * different signature, but, on other BSD-flavored UN*Xes, it's not 410 * declared in <net/bpf.h>, so we *do* want to declare it here, so it's 411 * declared when we build pcap-bpf.c. 412 */ 413 #ifndef __NetBSD__ 414 u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int); 415 #endif 416 int bpf_validate(const struct bpf_insn *f, int len); 417 char *bpf_image(const struct bpf_insn *, int); 418 void bpf_dump(const struct bpf_program *, int); 419 420 #if defined(WIN32) 421 422 /* 423 * Win32 definitions 424 */ 425 426 int pcap_setbuff(pcap_t *p, int dim); 427 int pcap_setmode(pcap_t *p, int mode); 428 int pcap_setmintocopy(pcap_t *p, int size); 429 430 #ifdef WPCAP 431 /* Include file with the wpcap-specific extensions */ 432 #include <Win32-Extensions.h> 433 #endif /* WPCAP */ 434 435 #define MODE_CAPT 0 436 #define MODE_STAT 1 437 #define MODE_MON 2 438 439 #elif defined(MSDOS) 440 441 /* 442 * MS-DOS definitions 443 */ 444 445 int pcap_stats_ex (pcap_t *, struct pcap_stat_ex *); 446 void pcap_set_wait (pcap_t *p, void (*yield)(void), int wait); 447 u_long pcap_mac_packets (void); 448 449 #else /* UN*X */ 450 451 /* 452 * UN*X definitions 453 */ 454 455 int pcap_get_selectable_fd(pcap_t *); 456 457 #endif /* WIN32/MSDOS/UN*X */ 458 459 #ifdef __cplusplus 460 } 461 #endif 462 463 #endif /* lib_pcap_pcap_h */ 464