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 * $FreeBSD$ 34 * @(#) $Header: /tcpdump/master/libpcap/pcap-int.h,v 1.85.2.9 2008-09-16 00:21:08 guy Exp $ (LBL) 35 */ 36 37 #ifndef pcap_int_h 38 #define pcap_int_h 39 40 #include <pcap/pcap.h> 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 #ifdef HAVE_LIBDLPI 47 #include <libdlpi.h> 48 #endif 49 50 #ifdef WIN32 51 #include <Packet32.h> 52 #endif /* WIN32 */ 53 54 #ifdef MSDOS 55 #include <fcntl.h> 56 #include <io.h> 57 #endif 58 59 #if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/ 60 61 /* 62 * Swap byte ordering of unsigned long long timestamp on a big endian 63 * machine. 64 */ 65 #define SWAPLL(ull) ((ull & 0xff00000000000000) >> 56) | \ 66 ((ull & 0x00ff000000000000) >> 40) | \ 67 ((ull & 0x0000ff0000000000) >> 24) | \ 68 ((ull & 0x000000ff00000000) >> 8) | \ 69 ((ull & 0x00000000ff000000) << 8) | \ 70 ((ull & 0x0000000000ff0000) << 24) | \ 71 ((ull & 0x000000000000ff00) << 40) | \ 72 ((ull & 0x00000000000000ff) << 56) 73 74 #else /* A recent Visual studio compiler or not VC */ 75 76 /* 77 * Swap byte ordering of unsigned long long timestamp on a big endian 78 * machine. 79 */ 80 #define SWAPLL(ull) ((ull & 0xff00000000000000LL) >> 56) | \ 81 ((ull & 0x00ff000000000000LL) >> 40) | \ 82 ((ull & 0x0000ff0000000000LL) >> 24) | \ 83 ((ull & 0x000000ff00000000LL) >> 8) | \ 84 ((ull & 0x00000000ff000000LL) << 8) | \ 85 ((ull & 0x0000000000ff0000LL) << 24) | \ 86 ((ull & 0x000000000000ff00LL) << 40) | \ 87 ((ull & 0x00000000000000ffLL) << 56) 88 89 #endif /* _MSC_VER */ 90 91 /* 92 * Savefile 93 */ 94 typedef enum { 95 NOT_SWAPPED, 96 SWAPPED, 97 MAYBE_SWAPPED 98 } swapped_type_t; 99 100 /* 101 * Used when reading a savefile. 102 */ 103 struct pcap_sf { 104 FILE *rfile; 105 int swapped; 106 size_t hdrsize; 107 swapped_type_t lengths_swapped; 108 int version_major; 109 int version_minor; 110 u_char *base; 111 }; 112 113 /* 114 * Used when doing a live capture. 115 */ 116 struct pcap_md { 117 struct pcap_stat stat; 118 /*XXX*/ 119 int use_bpf; /* using kernel filter */ 120 u_long TotPkts; /* can't oflow for 79 hrs on ether */ 121 u_long TotAccepted; /* count accepted by filter */ 122 u_long TotDrops; /* count of dropped packets */ 123 long TotMissed; /* missed by i/f during this run */ 124 long OrigMissed; /* missed by i/f before this run */ 125 char *device; /* device name */ 126 int timeout; /* timeout for buffering */ 127 int must_clear; /* stuff we must clear when we close */ 128 struct pcap *next; /* list of open pcaps that need stuff cleared on close */ 129 #ifdef linux 130 int sock_packet; /* using Linux 2.0 compatible interface */ 131 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */ 132 int ifindex; /* interface index of device we're bound to */ 133 int lo_ifindex; /* interface index of the loopback device */ 134 u_int packets_read; /* count of packets read with recvfrom() */ 135 bpf_u_int32 oldmode; /* mode to restore when turning monitor mode off */ 136 u_int tp_version; /* version of tpacket_hdr for mmaped ring */ 137 u_int tp_hdrlen; /* hdrlen of tpacket_hdr for mmaped ring */ 138 #endif /* linux */ 139 140 #ifdef HAVE_DAG_API 141 #ifdef HAVE_DAG_STREAMS_API 142 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */ 143 u_char *dag_mem_top; /* DAG card current memory top pointer */ 144 #else /* HAVE_DAG_STREAMS_API */ 145 void *dag_mem_base; /* DAG card memory base address */ 146 u_int dag_mem_bottom; /* DAG card current memory bottom offset */ 147 u_int dag_mem_top; /* DAG card current memory top offset */ 148 #endif /* HAVE_DAG_STREAMS_API */ 149 int dag_fcs_bits; /* Number of checksum bits from link layer */ 150 int dag_offset_flags; /* Flags to pass to dag_offset(). */ 151 int dag_stream; /* DAG stream number */ 152 int dag_timeout; /* timeout specified to pcap_open_live. 153 * Same as in linux above, introduce 154 * generally? */ 155 #endif /* HAVE_DAG_API */ 156 #ifdef HAVE_ZEROCOPY_BPF 157 /* 158 * Zero-copy read buffer -- for zero-copy BPF. 'buffer' above will 159 * alternative between these two actual mmap'd buffers as required. 160 * As there is a header on the front size of the mmap'd buffer, only 161 * some of the buffer is exposed to libpcap as a whole via bufsize; 162 * zbufsize is the true size. zbuffer tracks the current zbuf 163 * assocated with buffer so that it can be used to decide which the 164 * next buffer to read will be. 165 */ 166 u_char *zbuf1, *zbuf2, *zbuffer; 167 u_int zbufsize; 168 u_int zerocopy; 169 u_int interrupted; 170 struct timespec firstsel; 171 /* 172 * If there's currently a buffer being actively processed, then it is 173 * referenced here; 'buffer' is also pointed at it, but offset by the 174 * size of the header. 175 */ 176 struct bpf_zbuf_header *bzh; 177 #endif /* HAVE_ZEROCOPY_BPF */ 178 }; 179 180 /* 181 * Stuff to clear when we close. 182 */ 183 #define MUST_CLEAR_PROMISC 0x00000001 /* promiscuous mode */ 184 #define MUST_CLEAR_RFMON 0x00000002 /* rfmon (monitor) mode */ 185 186 struct pcap_opt { 187 int buffer_size; 188 char *source; 189 int promisc; 190 int rfmon; 191 }; 192 193 /* 194 * 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 195 * Tru64 UNIX, and some versions of NetBSD pad FDDI packets to make everything 196 * line up on a nice boundary. 197 */ 198 #ifdef __NetBSD__ 199 #include <sys/param.h> /* needed to declare __NetBSD_Version__ */ 200 #endif 201 202 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000) 203 #define PCAP_FDDIPAD 3 204 #endif 205 206 typedef int (*activate_op_t)(pcap_t *); 207 typedef int (*can_set_rfmon_op_t)(pcap_t *); 208 typedef int (*read_op_t)(pcap_t *, int cnt, pcap_handler, u_char *); 209 typedef int (*inject_op_t)(pcap_t *, const void *, size_t); 210 typedef int (*setfilter_op_t)(pcap_t *, struct bpf_program *); 211 typedef int (*setdirection_op_t)(pcap_t *, pcap_direction_t); 212 typedef int (*set_datalink_op_t)(pcap_t *, int); 213 typedef int (*getnonblock_op_t)(pcap_t *, char *); 214 typedef int (*setnonblock_op_t)(pcap_t *, int, char *); 215 typedef int (*stats_op_t)(pcap_t *, struct pcap_stat *); 216 #ifdef WIN32 217 typedef int (*setbuff_op_t)(pcap_t *, int); 218 typedef int (*setmode_op_t)(pcap_t *, int); 219 typedef int (*setmintocopy_op_t)(pcap_t *, int); 220 #endif 221 typedef void (*cleanup_op_t)(pcap_t *); 222 223 struct pcap { 224 #ifdef WIN32 225 ADAPTER *adapter; 226 LPPACKET Packet; 227 int nonblock; 228 #else 229 int fd; 230 int selectable_fd; 231 int send_fd; 232 #endif /* WIN32 */ 233 234 #ifdef HAVE_LIBDLPI 235 dlpi_handle_t dlpi_hd; 236 #endif 237 int snapshot; 238 int linktype; /* Network linktype */ 239 int linktype_ext; /* Extended information stored in the linktype field of a file */ 240 int tzoff; /* timezone offset */ 241 int offset; /* offset for proper alignment */ 242 int activated; /* true if the capture is really started */ 243 int oldstyle; /* if we're opening with pcap_open_live() */ 244 245 int break_loop; /* flag set to force break from packet-reading loop */ 246 247 #ifdef PCAP_FDDIPAD 248 int fddipad; 249 #endif 250 251 #ifdef MSDOS 252 void (*wait_proc)(void); /* call proc while waiting */ 253 #endif 254 255 struct pcap_sf sf; 256 struct pcap_md md; 257 struct pcap_opt opt; 258 259 /* 260 * Read buffer -- for file descriptor read buffer model. 261 */ 262 int bufsize; 263 u_char *buffer; 264 u_char *bp; 265 int cc; 266 int to_ms; 267 268 /* 269 * Zero-copy read buffer -- for zero-copy BPF. 'buffer' above will 270 * alternative between these two actual mmap'd buffers as required. 271 * As there is a header on the front size of the mmap'd buffer, only 272 * some of the buffer is exposed to libpcap as a whole via bufsize; 273 * zbufsize is the true size. zbuffer tracks the current zbuf 274 * assocated with buffer so that it can be used to decide which the 275 * next buffer to read will be. 276 */ 277 u_char *zbuf1, *zbuf2, *zbuffer; 278 u_int zbufsize; 279 u_int timeout; 280 u_int zerocopy; 281 u_int interrupted; 282 struct timespec firstsel; 283 284 /* 285 * If there's currently a buffer being actively processed, then it is 286 * referenced here; 'buffer' is also pointed at it, but offset by the 287 * size of the header. 288 */ 289 struct bpf_zbuf_header *bzh; 290 291 /* 292 * Place holder for pcap_next(). 293 */ 294 u_char *pkt; 295 296 /* We're accepting only packets in this direction/these directions. */ 297 pcap_direction_t direction; 298 299 /* 300 * Methods. 301 */ 302 activate_op_t activate_op; 303 can_set_rfmon_op_t can_set_rfmon_op; 304 read_op_t read_op; 305 inject_op_t inject_op; 306 setfilter_op_t setfilter_op; 307 setdirection_op_t setdirection_op; 308 set_datalink_op_t set_datalink_op; 309 getnonblock_op_t getnonblock_op; 310 setnonblock_op_t setnonblock_op; 311 stats_op_t stats_op; 312 313 #ifdef WIN32 314 /* 315 * These are, at least currently, specific to the Win32 NPF 316 * driver. 317 */ 318 setbuff_op_t setbuff_op; 319 setmode_op_t setmode_op; 320 setmintocopy_op_t setmintocopy_op; 321 #endif 322 cleanup_op_t cleanup_op; 323 324 /* 325 * Placeholder for filter code if bpf not in kernel. 326 */ 327 struct bpf_program fcode; 328 329 char errbuf[PCAP_ERRBUF_SIZE + 1]; 330 int dlt_count; 331 u_int *dlt_list; 332 333 struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */ 334 }; 335 336 /* 337 * This is a timeval as stored in a savefile. 338 * It has to use the same types everywhere, independent of the actual 339 * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some 340 * platforms and 64-bit tv_sec values on other platforms, and writing 341 * out native `struct timeval' values would mean files could only be 342 * read on systems with the same tv_sec size as the system on which 343 * the file was written. 344 */ 345 346 struct pcap_timeval { 347 bpf_int32 tv_sec; /* seconds */ 348 bpf_int32 tv_usec; /* microseconds */ 349 }; 350 351 /* 352 * This is a `pcap_pkthdr' as actually stored in a savefile. 353 * 354 * Do not change the format of this structure, in any way (this includes 355 * changes that only affect the length of fields in this structure), 356 * and do not make the time stamp anything other than seconds and 357 * microseconds (e.g., seconds and nanoseconds). Instead: 358 * 359 * introduce a new structure for the new format; 360 * 361 * send mail to "tcpdump-workers@lists.tcpdump.org", requesting 362 * a new magic number for your new capture file format, and, when 363 * you get the new magic number, put it in "savefile.c"; 364 * 365 * use that magic number for save files with the changed record 366 * header; 367 * 368 * make the code in "savefile.c" capable of reading files with 369 * the old record header as well as files with the new record header 370 * (using the magic number to determine the header format). 371 * 372 * Then supply the changes as a patch at 373 * 374 * http://sourceforge.net/projects/libpcap/ 375 * 376 * so that future versions of libpcap and programs that use it (such as 377 * tcpdump) will be able to read your new capture file format. 378 */ 379 380 struct pcap_sf_pkthdr { 381 struct pcap_timeval ts; /* time stamp */ 382 bpf_u_int32 caplen; /* length of portion present */ 383 bpf_u_int32 len; /* length this packet (off wire) */ 384 }; 385 386 /* 387 * How a `pcap_pkthdr' is actually stored in savefiles written 388 * by some patched versions of libpcap (e.g. the ones in Red 389 * Hat Linux 6.1 and 6.2). 390 * 391 * Do not change the format of this structure, in any way (this includes 392 * changes that only affect the length of fields in this structure). 393 * Instead, introduce a new structure, as per the above. 394 */ 395 396 struct pcap_sf_patched_pkthdr { 397 struct pcap_timeval ts; /* time stamp */ 398 bpf_u_int32 caplen; /* length of portion present */ 399 bpf_u_int32 len; /* length this packet (off wire) */ 400 int index; 401 unsigned short protocol; 402 unsigned char pkt_type; 403 }; 404 405 int yylex(void); 406 407 #ifndef min 408 #define min(a, b) ((a) > (b) ? (b) : (a)) 409 #endif 410 411 /* XXX should these be in pcap.h? */ 412 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *); 413 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *); 414 415 #ifndef HAVE_STRLCPY 416 #define strlcpy(x, y, z) \ 417 (strncpy((x), (y), (z)), \ 418 ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \ 419 strlen((y))) 420 #endif 421 422 #include <stdarg.h> 423 424 /* 425 * Routines that most pcap implementations can use for non-blocking mode. 426 */ 427 #if !defined(WIN32) && !defined(MSDOS) 428 int pcap_getnonblock_fd(pcap_t *, char *); 429 int pcap_setnonblock_fd(pcap_t *p, int, char *); 430 #endif 431 432 pcap_t *pcap_create_common(const char *, char *); 433 int pcap_do_addexit(pcap_t *); 434 void pcap_add_to_pcaps_to_close(pcap_t *); 435 void pcap_remove_from_pcaps_to_close(pcap_t *); 436 void pcap_cleanup_live_common(pcap_t *); 437 int pcap_not_initialized(pcap_t *); 438 int pcap_check_activated(pcap_t *); 439 440 /* 441 * Internal interfaces for "pcap_findalldevs()". 442 * 443 * "pcap_platform_finddevs()" is a platform-dependent routine to 444 * add devices not found by the "standard" mechanisms (SIOCGIFCONF, 445 * "getifaddrs()", etc.. 446 * 447 * "pcap_add_if()" adds an interface to the list of interfaces. 448 */ 449 int pcap_platform_finddevs(pcap_if_t **, char *); 450 int add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *, 451 size_t, struct sockaddr *, size_t, struct sockaddr *, size_t, 452 struct sockaddr *, size_t, char *); 453 int pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *); 454 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t); 455 int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int, 456 const char *, char *); 457 458 #ifdef WIN32 459 char *pcap_win32strerror(void); 460 #endif 461 462 int install_bpf_program(pcap_t *, struct bpf_program *); 463 464 int pcap_strcasecmp(const char *, const char *); 465 466 #ifdef __cplusplus 467 } 468 #endif 469 470 #endif 471