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 1.94 2008-09-16 00:20:23 guy Exp (LBL) 34 */ 35 36 #ifndef pcap_int_h 37 #define pcap_int_h 38 39 #include <pcap/pcap.h> 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 #ifdef HAVE_LIBDLPI 46 #include <libdlpi.h> 47 #endif 48 49 #ifdef WIN32 50 #include <Packet32.h> 51 extern CRITICAL_SECTION g_PcapCompileCriticalSection; 52 #endif /* WIN32 */ 53 54 #ifdef MSDOS 55 #include <fcntl.h> 56 #include <io.h> 57 #endif 58 59 #ifdef HAVE_SNF_API 60 #include <snf.h> 61 #endif 62 63 #if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/ 64 65 /* 66 * Swap byte ordering of unsigned long long timestamp on a big endian 67 * machine. 68 */ 69 #define SWAPLL(ull) ((ull & 0xff00000000000000) >> 56) | \ 70 ((ull & 0x00ff000000000000) >> 40) | \ 71 ((ull & 0x0000ff0000000000) >> 24) | \ 72 ((ull & 0x000000ff00000000) >> 8) | \ 73 ((ull & 0x00000000ff000000) << 8) | \ 74 ((ull & 0x0000000000ff0000) << 24) | \ 75 ((ull & 0x000000000000ff00) << 40) | \ 76 ((ull & 0x00000000000000ff) << 56) 77 78 #else /* A recent Visual studio compiler or not VC */ 79 80 /* 81 * Swap byte ordering of unsigned long long timestamp on a big endian 82 * machine. 83 */ 84 #define SWAPLL(ull) ((ull & 0xff00000000000000LL) >> 56) | \ 85 ((ull & 0x00ff000000000000LL) >> 40) | \ 86 ((ull & 0x0000ff0000000000LL) >> 24) | \ 87 ((ull & 0x000000ff00000000LL) >> 8) | \ 88 ((ull & 0x00000000ff000000LL) << 8) | \ 89 ((ull & 0x0000000000ff0000LL) << 24) | \ 90 ((ull & 0x000000000000ff00LL) << 40) | \ 91 ((ull & 0x00000000000000ffLL) << 56) 92 93 #endif /* _MSC_VER */ 94 95 /* 96 * Savefile 97 */ 98 typedef enum { 99 NOT_SWAPPED, 100 SWAPPED, 101 MAYBE_SWAPPED 102 } swapped_type_t; 103 104 /* 105 * Used when reading a savefile. 106 */ 107 struct pcap_sf { 108 FILE *rfile; 109 int (*next_packet_op)(pcap_t *, struct pcap_pkthdr *, u_char **); 110 int swapped; 111 size_t hdrsize; 112 swapped_type_t lengths_swapped; 113 int version_major; 114 int version_minor; 115 bpf_u_int32 ifcount; /* number of interfaces seen in this capture */ 116 u_int tsresol; /* time stamp resolution */ 117 u_int tsscale; /* scaling factor for resolution -> microseconds */ 118 u_int64_t tsoffset; /* time stamp offset */ 119 }; 120 121 /* 122 * Used when doing a live capture. 123 */ 124 struct pcap_md { 125 struct pcap_stat stat; 126 /*XXX*/ 127 int use_bpf; /* using kernel filter */ 128 u_long TotPkts; /* can't oflow for 79 hrs on ether */ 129 u_long TotAccepted; /* count accepted by filter */ 130 u_long TotDrops; /* count of dropped packets */ 131 long TotMissed; /* missed by i/f during this run */ 132 long OrigMissed; /* missed by i/f before this run */ 133 char *device; /* device name */ 134 int timeout; /* timeout for buffering */ 135 int must_do_on_close; /* stuff we must do when we close */ 136 struct pcap *next; /* list of open pcaps that need stuff cleared on close */ 137 #ifdef linux 138 int sock_packet; /* using Linux 2.0 compatible interface */ 139 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */ 140 int ifindex; /* interface index of device we're bound to */ 141 int lo_ifindex; /* interface index of the loopback device */ 142 u_int packets_read; /* count of packets read with recvfrom() */ 143 bpf_u_int32 oldmode; /* mode to restore when turning monitor mode off */ 144 char *mondevice; /* mac80211 monitor device we created */ 145 u_char *mmapbuf; /* memory-mapped region pointer */ 146 size_t mmapbuflen; /* size of region */ 147 u_int tp_version; /* version of tpacket_hdr for mmaped ring */ 148 u_int tp_hdrlen; /* hdrlen of tpacket_hdr for mmaped ring */ 149 u_char *oneshot_buffer; /* buffer for copy of packet */ 150 long proc_dropped; /* packets reported dropped by /proc/net/dev */ 151 #endif /* linux */ 152 153 #ifdef HAVE_DAG_API 154 #ifdef HAVE_DAG_STREAMS_API 155 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */ 156 u_char *dag_mem_top; /* DAG card current memory top pointer */ 157 #else /* HAVE_DAG_STREAMS_API */ 158 void *dag_mem_base; /* DAG card memory base address */ 159 u_int dag_mem_bottom; /* DAG card current memory bottom offset */ 160 u_int dag_mem_top; /* DAG card current memory top offset */ 161 #endif /* HAVE_DAG_STREAMS_API */ 162 int dag_fcs_bits; /* Number of checksum bits from link layer */ 163 int dag_offset_flags; /* Flags to pass to dag_offset(). */ 164 int dag_stream; /* DAG stream number */ 165 int dag_timeout; /* timeout specified to pcap_open_live. 166 * Same as in linux above, introduce 167 * generally? */ 168 #endif /* HAVE_DAG_API */ 169 #ifdef HAVE_SNF_API 170 snf_handle_t snf_handle; /* opaque device handle */ 171 snf_ring_t snf_ring; /* opaque device ring handle */ 172 int snf_timeout; 173 int snf_boardnum; 174 #endif /*HAVE_SNF_API*/ 175 176 #ifdef HAVE_ZEROCOPY_BPF 177 /* 178 * Zero-copy read buffer -- for zero-copy BPF. 'buffer' above will 179 * alternative between these two actual mmap'd buffers as required. 180 * As there is a header on the front size of the mmap'd buffer, only 181 * some of the buffer is exposed to libpcap as a whole via bufsize; 182 * zbufsize is the true size. zbuffer tracks the current zbuf 183 * assocated with buffer so that it can be used to decide which the 184 * next buffer to read will be. 185 */ 186 u_char *zbuf1, *zbuf2, *zbuffer; 187 u_int zbufsize; 188 u_int zerocopy; 189 u_int interrupted; 190 struct timespec firstsel; 191 /* 192 * If there's currently a buffer being actively processed, then it is 193 * referenced here; 'buffer' is also pointed at it, but offset by the 194 * size of the header. 195 */ 196 struct bpf_zbuf_header *bzh; 197 #endif /* HAVE_ZEROCOPY_BPF */ 198 }; 199 200 /* 201 * Stuff to do when we close. 202 */ 203 #define MUST_CLEAR_PROMISC 0x00000001 /* clear promiscuous mode */ 204 #define MUST_CLEAR_RFMON 0x00000002 /* clear rfmon (monitor) mode */ 205 #define MUST_DELETE_MONIF 0x00000004 /* delete monitor-mode interface */ 206 207 struct pcap_opt { 208 int buffer_size; 209 char *source; 210 int promisc; 211 int rfmon; 212 }; 213 214 /* 215 * 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 216 * Tru64 UNIX, and some versions of NetBSD pad FDDI packets to make everything 217 * line up on a nice boundary. 218 */ 219 #ifdef __NetBSD__ 220 #include <sys/param.h> /* needed to declare __NetBSD_Version__ */ 221 #endif 222 223 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000) 224 #define PCAP_FDDIPAD 3 225 #endif 226 227 typedef int (*activate_op_t)(pcap_t *); 228 typedef int (*can_set_rfmon_op_t)(pcap_t *); 229 typedef int (*read_op_t)(pcap_t *, int cnt, pcap_handler, u_char *); 230 typedef int (*inject_op_t)(pcap_t *, const void *, size_t); 231 typedef int (*setfilter_op_t)(pcap_t *, struct bpf_program *); 232 typedef int (*setdirection_op_t)(pcap_t *, pcap_direction_t); 233 typedef int (*set_datalink_op_t)(pcap_t *, int); 234 typedef int (*getnonblock_op_t)(pcap_t *, char *); 235 typedef int (*setnonblock_op_t)(pcap_t *, int, char *); 236 typedef int (*stats_op_t)(pcap_t *, struct pcap_stat *); 237 #ifdef WIN32 238 typedef int (*setbuff_op_t)(pcap_t *, int); 239 typedef int (*setmode_op_t)(pcap_t *, int); 240 typedef int (*setmintocopy_op_t)(pcap_t *, int); 241 #endif 242 typedef void (*cleanup_op_t)(pcap_t *); 243 244 struct pcap { 245 #ifdef WIN32 246 ADAPTER *adapter; 247 LPPACKET Packet; 248 int nonblock; 249 #else 250 int fd; 251 int selectable_fd; 252 int send_fd; 253 #endif /* WIN32 */ 254 255 #ifdef HAVE_LIBDLPI 256 dlpi_handle_t dlpi_hd; 257 #endif 258 int snapshot; 259 int linktype; /* Network linktype */ 260 int linktype_ext; /* Extended information stored in the linktype field of a file */ 261 int tzoff; /* timezone offset */ 262 int offset; /* offset for proper alignment */ 263 int activated; /* true if the capture is really started */ 264 int oldstyle; /* if we're opening with pcap_open_live() */ 265 266 int break_loop; /* flag set to force break from packet-reading loop */ 267 268 #ifdef PCAP_FDDIPAD 269 int fddipad; 270 #endif 271 272 #ifdef MSDOS 273 void (*wait_proc)(void); /* call proc while waiting */ 274 #endif 275 276 struct pcap_sf sf; 277 struct pcap_md md; 278 struct pcap_opt opt; 279 280 /* 281 * Read buffer. 282 */ 283 int bufsize; 284 u_char *buffer; 285 u_char *bp; 286 int cc; 287 288 /* 289 * Place holder for pcap_next(). 290 */ 291 u_char *pkt; 292 293 /* We're accepting only packets in this direction/these directions. */ 294 pcap_direction_t direction; 295 296 /* 297 * Methods. 298 */ 299 activate_op_t activate_op; 300 can_set_rfmon_op_t can_set_rfmon_op; 301 read_op_t read_op; 302 inject_op_t inject_op; 303 setfilter_op_t setfilter_op; 304 setdirection_op_t setdirection_op; 305 set_datalink_op_t set_datalink_op; 306 getnonblock_op_t getnonblock_op; 307 setnonblock_op_t setnonblock_op; 308 stats_op_t stats_op; 309 310 /* 311 * Routine to use as callback for pcap_next()/pcap_next_ex(). 312 */ 313 pcap_handler oneshot_callback; 314 315 #ifdef WIN32 316 /* 317 * These are, at least currently, specific to the Win32 NPF 318 * driver. 319 */ 320 setbuff_op_t setbuff_op; 321 setmode_op_t setmode_op; 322 setmintocopy_op_t setmintocopy_op; 323 #endif 324 cleanup_op_t cleanup_op; 325 326 /* 327 * Placeholder for filter code if bpf not in kernel. 328 */ 329 struct bpf_program fcode; 330 331 char errbuf[PCAP_ERRBUF_SIZE + 1]; 332 int dlt_count; 333 u_int *dlt_list; 334 335 struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */ 336 }; 337 338 /* 339 * This is a timeval as stored in a savefile. 340 * It has to use the same types everywhere, independent of the actual 341 * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some 342 * platforms and 64-bit tv_sec values on other platforms, and writing 343 * out native `struct timeval' values would mean files could only be 344 * read on systems with the same tv_sec size as the system on which 345 * the file was written. 346 */ 347 348 struct pcap_timeval { 349 bpf_int32 tv_sec; /* seconds */ 350 bpf_int32 tv_usec; /* microseconds */ 351 }; 352 353 /* 354 * This is a `pcap_pkthdr' as actually stored in a savefile. 355 * 356 * Do not change the format of this structure, in any way (this includes 357 * changes that only affect the length of fields in this structure), 358 * and do not make the time stamp anything other than seconds and 359 * microseconds (e.g., seconds and nanoseconds). Instead: 360 * 361 * introduce a new structure for the new format; 362 * 363 * send mail to "tcpdump-workers@lists.tcpdump.org", requesting 364 * a new magic number for your new capture file format, and, when 365 * you get the new magic number, put it in "savefile.c"; 366 * 367 * use that magic number for save files with the changed record 368 * header; 369 * 370 * make the code in "savefile.c" capable of reading files with 371 * the old record header as well as files with the new record header 372 * (using the magic number to determine the header format). 373 * 374 * Then supply the changes as a patch at 375 * 376 * http://sourceforge.net/projects/libpcap/ 377 * 378 * so that future versions of libpcap and programs that use it (such as 379 * tcpdump) will be able to read your new capture file format. 380 */ 381 382 struct pcap_sf_pkthdr { 383 struct pcap_timeval ts; /* time stamp */ 384 bpf_u_int32 caplen; /* length of portion present */ 385 bpf_u_int32 len; /* length this packet (off wire) */ 386 }; 387 388 /* 389 * How a `pcap_pkthdr' is actually stored in savefiles written 390 * by some patched versions of libpcap (e.g. the ones in Red 391 * Hat Linux 6.1 and 6.2). 392 * 393 * Do not change the format of this structure, in any way (this includes 394 * changes that only affect the length of fields in this structure). 395 * Instead, introduce a new structure, as per the above. 396 */ 397 398 struct pcap_sf_patched_pkthdr { 399 struct pcap_timeval ts; /* time stamp */ 400 bpf_u_int32 caplen; /* length of portion present */ 401 bpf_u_int32 len; /* length this packet (off wire) */ 402 int index; 403 unsigned short protocol; 404 unsigned char pkt_type; 405 }; 406 407 /* 408 * User data structure for the one-shot callback used for pcap_next() 409 * and pcap_next_ex(). 410 */ 411 struct oneshot_userdata { 412 struct pcap_pkthdr *hdr; 413 const u_char **pkt; 414 pcap_t *pd; 415 }; 416 417 int yylex(void); 418 419 #ifndef min 420 #define min(a, b) ((a) > (b) ? (b) : (a)) 421 #endif 422 423 /* XXX should these be in pcap.h? */ 424 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *); 425 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *); 426 427 #ifndef HAVE_STRLCPY 428 #define strlcpy(x, y, z) \ 429 (strncpy((x), (y), (z)), \ 430 ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \ 431 strlen((y))) 432 #endif 433 434 #include <stdarg.h> 435 436 #if !defined(HAVE_SNPRINTF) 437 #define snprintf pcap_snprintf 438 extern int snprintf (char *, size_t, const char *, ...); 439 #endif 440 441 #if !defined(HAVE_VSNPRINTF) 442 #define vsnprintf pcap_vsnprintf 443 extern int vsnprintf (char *, size_t, const char *, va_list ap); 444 #endif 445 446 /* 447 * Routines that most pcap implementations can use for non-blocking mode. 448 */ 449 #if !defined(WIN32) && !defined(MSDOS) 450 int pcap_getnonblock_fd(pcap_t *, char *); 451 int pcap_setnonblock_fd(pcap_t *p, int, char *); 452 #endif 453 454 pcap_t *pcap_create_common(const char *, char *); 455 int pcap_do_addexit(pcap_t *); 456 void pcap_add_to_pcaps_to_close(pcap_t *); 457 void pcap_remove_from_pcaps_to_close(pcap_t *); 458 void pcap_cleanup_live_common(pcap_t *); 459 int pcap_not_initialized(pcap_t *); 460 int pcap_check_activated(pcap_t *); 461 462 /* 463 * Internal interfaces for "pcap_findalldevs()". 464 * 465 * "pcap_platform_finddevs()" is a platform-dependent routine to 466 * add devices not found by the "standard" mechanisms (SIOCGIFCONF, 467 * "getifaddrs()", etc.. 468 * 469 * "pcap_add_if()" adds an interface to the list of interfaces. 470 */ 471 int pcap_platform_finddevs(pcap_if_t **, char *); 472 int add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *, 473 size_t, struct sockaddr *, size_t, struct sockaddr *, size_t, 474 struct sockaddr *, size_t, char *); 475 int pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *); 476 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t); 477 int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int, 478 const char *, char *); 479 480 #ifdef WIN32 481 char *pcap_win32strerror(void); 482 #endif 483 484 int install_bpf_program(pcap_t *, struct bpf_program *); 485 486 int pcap_strcasecmp(const char *, const char *); 487 488 #ifdef __cplusplus 489 } 490 #endif 491 492 #endif 493