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