1 /* $NetBSD: pcap.c,v 1.4 2013/12/31 17:08:23 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the Computer Systems 18 * Engineering Group at Lawrence Berkeley Laboratory. 19 * 4. Neither the name of the University nor of the Laboratory may be used 20 * to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static const char rcsid[] _U_ = 38 "@(#) Header: /tcpdump/master/libpcap/pcap.c,v 1.128 2008-12-23 20:13:29 guy Exp (LBL)"; 39 #endif 40 41 #ifdef HAVE_CONFIG_H 42 #include "config.h" 43 #endif 44 45 #ifdef WIN32 46 #include <pcap-stdinc.h> 47 #else /* WIN32 */ 48 #if HAVE_INTTYPES_H 49 #include <inttypes.h> 50 #elif HAVE_STDINT_H 51 #include <stdint.h> 52 #endif 53 #ifdef HAVE_SYS_BITYPES_H 54 #include <sys/bitypes.h> 55 #endif 56 #include <sys/types.h> 57 #endif /* WIN32 */ 58 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__) 63 #include <unistd.h> 64 #endif 65 #include <fcntl.h> 66 #include <errno.h> 67 68 #ifdef HAVE_OS_PROTO_H 69 #include "os-proto.h" 70 #endif 71 72 #ifdef MSDOS 73 #include "pcap-dos.h" 74 #endif 75 76 #include "pcap-int.h" 77 78 #ifdef HAVE_DAG_API 79 #include "pcap-dag.h" 80 #endif /* HAVE_DAG_API */ 81 82 #ifdef HAVE_SEPTEL_API 83 #include "pcap-septel.h" 84 #endif /* HAVE_SEPTEL_API */ 85 86 #ifdef HAVE_SNF_API 87 #include "pcap-snf.h" 88 #endif /* HAVE_SNF_API */ 89 90 #ifdef PCAP_SUPPORT_USB 91 #include "pcap-usb-linux.h" 92 #endif 93 94 #ifdef PCAP_SUPPORT_BT 95 #include "pcap-bt-linux.h" 96 #endif 97 98 #ifdef PCAP_SUPPORT_CAN 99 #include "pcap-can-linux.h" 100 #endif 101 102 #ifdef PCAP_SUPPORT_CANUSB 103 #include "pcap-canusb-linux.h" 104 #endif 105 106 #ifdef PCAP_SUPPORT_NETFILTER 107 #include "pcap-netfilter-linux.h" 108 #endif 109 110 #ifdef PCAP_SUPPORT_DBUS 111 #include "pcap-dbus.h" 112 #endif 113 114 int 115 pcap_not_initialized(pcap_t *pcap _U_) 116 { 117 /* this means 'not initialized' */ 118 return (PCAP_ERROR_NOT_ACTIVATED); 119 } 120 121 #ifdef WIN32 122 Adapter * 123 pcap_no_adapter(pcap_t *pcap _U_) 124 { 125 return (NULL); 126 } 127 #endif 128 129 /* 130 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't, 131 * a PCAP_ERROR value on an error. 132 */ 133 int 134 pcap_can_set_rfmon(pcap_t *p) 135 { 136 return (p->can_set_rfmon_op(p)); 137 } 138 139 /* 140 * For systems where rfmon mode is never supported. 141 */ 142 static int 143 pcap_cant_set_rfmon(pcap_t *p _U_) 144 { 145 return (0); 146 } 147 148 /* 149 * Sets *tstamp_typesp to point to an array 1 or more supported time stamp 150 * types; the return value is the number of supported time stamp types. 151 * The list should be freed by a call to pcap_free_tstamp_types() when 152 * you're done with it. 153 * 154 * A return value of 0 means "you don't get a choice of time stamp type", 155 * in which case *tstamp_typesp is set to null. 156 * 157 * PCAP_ERROR is returned on error. 158 */ 159 int 160 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp) 161 { 162 if (p->tstamp_type_count == 0) { 163 /* 164 * We don't support multiple time stamp types. 165 */ 166 *tstamp_typesp = NULL; 167 } else { 168 *tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp), 169 p->tstamp_type_count); 170 if (*tstamp_typesp == NULL) { 171 (void)snprintf(p->errbuf, sizeof(p->errbuf), 172 "malloc: %s", pcap_strerror(errno)); 173 return (PCAP_ERROR); 174 } 175 (void)memcpy(*tstamp_typesp, p->tstamp_type_list, 176 sizeof(**tstamp_typesp) * p->tstamp_type_count); 177 } 178 return (p->tstamp_type_count); 179 } 180 181 /* 182 * In Windows, you might have a library built with one version of the 183 * C runtime library and an application built with another version of 184 * the C runtime library, which means that the library might use one 185 * version of malloc() and free() and the application might use another 186 * version of malloc() and free(). If so, that means something 187 * allocated by the library cannot be freed by the application, so we 188 * need to have a pcap_free_tstamp_types() routine to free up the list 189 * allocated by pcap_list_tstamp_types(), even though it's just a wrapper 190 * around free(). 191 */ 192 void 193 pcap_free_tstamp_types(int *tstamp_type_list) 194 { 195 free(tstamp_type_list); 196 } 197 198 /* 199 * Default one-shot callback; overridden for capture types where the 200 * packet data cannot be guaranteed to be available after the callback 201 * returns, so that a copy must be made. 202 */ 203 void 204 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt) 205 { 206 struct oneshot_userdata *sp = (struct oneshot_userdata *)user; 207 208 *sp->hdr = *h; 209 *sp->pkt = pkt; 210 } 211 212 const u_char * 213 pcap_next(pcap_t *p, struct pcap_pkthdr *h) 214 { 215 struct oneshot_userdata s; 216 const u_char *pkt; 217 218 s.hdr = h; 219 s.pkt = &pkt; 220 s.pd = p; 221 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0) 222 return (0); 223 return (pkt); 224 } 225 226 int 227 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, 228 const u_char **pkt_data) 229 { 230 struct oneshot_userdata s; 231 232 s.hdr = &p->pcap_header; 233 s.pkt = pkt_data; 234 s.pd = p; 235 236 /* Saves a pointer to the packet headers */ 237 *pkt_header= &p->pcap_header; 238 239 if (p->rfile != NULL) { 240 int status; 241 242 /* We are on an offline capture */ 243 status = pcap_offline_read(p, 1, p->oneshot_callback, 244 (u_char *)&s); 245 246 /* 247 * Return codes for pcap_offline_read() are: 248 * - 0: EOF 249 * - -1: error 250 * - >1: OK 251 * The first one ('0') conflicts with the return code of 252 * 0 from pcap_read() meaning "no packets arrived before 253 * the timeout expired", so we map it to -2 so you can 254 * distinguish between an EOF from a savefile and a 255 * "no packets arrived before the timeout expired, try 256 * again" from a live capture. 257 */ 258 if (status == 0) 259 return (-2); 260 else 261 return (status); 262 } 263 264 /* 265 * Return codes for pcap_read() are: 266 * - 0: timeout 267 * - -1: error 268 * - -2: loop was broken out of with pcap_breakloop() 269 * - >1: OK 270 * The first one ('0') conflicts with the return code of 0 from 271 * pcap_offline_read() meaning "end of file". 272 */ 273 return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s)); 274 } 275 276 #if defined(DAG_ONLY) 277 int 278 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) 279 { 280 return (dag_findalldevs(alldevsp, errbuf)); 281 } 282 283 pcap_t * 284 pcap_create(const char *source, char *errbuf) 285 { 286 return (dag_create(source, errbuf)); 287 } 288 #elif defined(SEPTEL_ONLY) 289 int 290 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) 291 { 292 return (septel_findalldevs(alldevsp, errbuf)); 293 } 294 295 pcap_t * 296 pcap_create(const char *source, char *errbuf) 297 { 298 return (septel_create(source, errbuf)); 299 } 300 #elif defined(SNF_ONLY) 301 int 302 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) 303 { 304 return (snf_findalldevs(alldevsp, errbuf)); 305 } 306 307 pcap_t * 308 pcap_create(const char *source, char *errbuf) 309 { 310 return (snf_create(source, errbuf)); 311 } 312 #else /* regular pcap */ 313 struct capture_source_type { 314 int (*findalldevs_op)(pcap_if_t **, char *); 315 pcap_t *(*create_op)(const char *, char *, int *); 316 } capture_source_types[] = { 317 #ifdef HAVE_DAG_API 318 { dag_findalldevs, dag_create }, 319 #endif 320 #ifdef HAVE_SEPTEL_API 321 { septel_findalldevs, septel_create }, 322 #endif 323 #ifdef HAVE_SNF_API 324 { snf_findalldevs, snf_create }, 325 #endif 326 #ifdef PCAP_SUPPORT_BT 327 { bt_findalldevs, bt_create }, 328 #endif 329 #if PCAP_SUPPORT_CANUSB 330 { canusb_findalldevs, canusb_create }, 331 #endif 332 #ifdef PCAP_SUPPORT_CAN 333 { can_findalldevs, can_create }, 334 #endif 335 #ifdef PCAP_SUPPORT_USB 336 { usb_findalldevs, usb_create }, 337 #endif 338 #ifdef PCAP_SUPPORT_NETFILTER 339 { netfilter_findalldevs, netfilter_create }, 340 #endif 341 #ifdef PCAP_SUPPORT_DBUS 342 { dbus_findalldevs, dbus_create }, 343 #endif 344 { NULL, NULL } 345 }; 346 347 /* 348 * Get a list of all capture sources that are up and that we can open. 349 * Returns -1 on error, 0 otherwise. 350 * The list, as returned through "alldevsp", may be null if no interfaces 351 * were up and could be opened. 352 */ 353 int 354 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) 355 { 356 size_t i; 357 358 /* 359 * Get the list of regular interfaces first. 360 */ 361 if (pcap_findalldevs_interfaces(alldevsp, errbuf) == -1) 362 return (-1); /* failure */ 363 364 /* 365 * Add any interfaces that need a platform-specific mechanism 366 * to find. 367 */ 368 if (pcap_platform_finddevs(alldevsp, errbuf) == -1) { 369 /* 370 * We had an error; free the list we've been 371 * constructing. 372 */ 373 if (*alldevsp != NULL) { 374 pcap_freealldevs(*alldevsp); 375 *alldevsp = NULL; 376 } 377 return (-1); 378 } 379 380 /* 381 * Ask each of the non-local-network-interface capture 382 * source types what interfaces they have. 383 */ 384 for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) { 385 if (capture_source_types[i].findalldevs_op(alldevsp, errbuf) == -1) { 386 /* 387 * We had an error; free the list we've been 388 * constructing. 389 */ 390 if (*alldevsp != NULL) { 391 pcap_freealldevs(*alldevsp); 392 *alldevsp = NULL; 393 } 394 return (-1); 395 } 396 } 397 return (0); 398 } 399 400 pcap_t * 401 pcap_create(const char *source, char *errbuf) 402 { 403 size_t i; 404 int is_theirs; 405 pcap_t *p; 406 407 /* 408 * A null source name is equivalent to the "any" device - 409 * which might not be supported on this platform, but 410 * this means that you'll get a "not supported" error 411 * rather than, say, a crash when we try to dereference 412 * the null pointer. 413 */ 414 if (source == NULL) 415 source = "any"; 416 417 /* 418 * Try each of the non-local-network-interface capture 419 * source types until we find one that works for this 420 * device or run out of types. 421 */ 422 for (i = 0; capture_source_types[i].create_op != NULL; i++) { 423 is_theirs = 0; 424 p = capture_source_types[i].create_op(source, errbuf, &is_theirs); 425 if (is_theirs) { 426 /* 427 * The device name refers to a device of the 428 * type in question; either it succeeded, 429 * in which case p refers to a pcap_t to 430 * later activate for the device, or it 431 * failed, in which case p is null and we 432 * should return that to report the failure 433 * to create. 434 */ 435 return (p); 436 } 437 } 438 439 /* 440 * OK, try it as a regular network interface. 441 */ 442 return (pcap_create_interface(source, errbuf)); 443 } 444 #endif 445 446 static void 447 initialize_ops(pcap_t *p) 448 { 449 /* 450 * Set operation pointers for operations that only work on 451 * an activated pcap_t to point to a routine that returns 452 * a "this isn't activated" error. 453 */ 454 p->read_op = (read_op_t)pcap_not_initialized; 455 p->inject_op = (inject_op_t)pcap_not_initialized; 456 p->setfilter_op = (setfilter_op_t)pcap_not_initialized; 457 p->setdirection_op = (setdirection_op_t)pcap_not_initialized; 458 p->set_datalink_op = (set_datalink_op_t)pcap_not_initialized; 459 p->getnonblock_op = (getnonblock_op_t)pcap_not_initialized; 460 p->setnonblock_op = (setnonblock_op_t)pcap_not_initialized; 461 p->stats_op = (stats_op_t)pcap_not_initialized; 462 #ifdef WIN32 463 p->setbuff_op = (setbuff_op_t)pcap_not_initialized; 464 p->setmode_op = (setmode_op_t)pcap_not_initialized; 465 p->setmintocopy_op = (setmintocopy_op_t)pcap_not_initialized; 466 p->getadapter_op = pcap_no_adapter; 467 #endif 468 469 /* 470 * Default cleanup operation - implementations can override 471 * this, but should call pcap_cleanup_live_common() after 472 * doing their own additional cleanup. 473 */ 474 p->cleanup_op = pcap_cleanup_live_common; 475 476 /* 477 * In most cases, the standard one-shot callback can 478 * be used for pcap_next()/pcap_next_ex(). 479 */ 480 p->oneshot_callback = pcap_oneshot; 481 } 482 483 static pcap_t * 484 pcap_alloc_pcap_t(char *ebuf, size_t size) 485 { 486 char *chunk; 487 pcap_t *p; 488 489 /* 490 * Allocate a chunk of memory big enough for a pcap_t 491 * plus a structure following it of size "size". The 492 * structure following it is a private data structure 493 * for the routines that handle this pcap_t. 494 */ 495 chunk = malloc(sizeof (pcap_t) + size); 496 if (chunk == NULL) { 497 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 498 pcap_strerror(errno)); 499 return (NULL); 500 } 501 memset(chunk, 0, sizeof (pcap_t) + size); 502 503 /* 504 * Get a pointer to the pcap_t at the beginning. 505 */ 506 p = (pcap_t *)chunk; 507 508 #ifndef WIN32 509 p->fd = -1; /* not opened yet */ 510 p->selectable_fd = -1; 511 #endif 512 513 if (size == 0) { 514 /* No private data was requested. */ 515 p->priv = NULL; 516 } else { 517 /* 518 * Set the pointer to the private data; that's the structure 519 * of size "size" following the pcap_t. 520 */ 521 p->priv = (void *)(chunk + sizeof (pcap_t)); 522 } 523 524 return (p); 525 } 526 527 pcap_t * 528 pcap_create_common(const char *source, char *ebuf, size_t size) 529 { 530 pcap_t *p; 531 532 p = pcap_alloc_pcap_t(ebuf, size); 533 if (p == NULL) 534 return (NULL); 535 536 p->opt.source = strdup(source); 537 if (p->opt.source == NULL) { 538 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 539 pcap_strerror(errno)); 540 free(p); 541 return (NULL); 542 } 543 544 /* 545 * Default to "can't set rfmon mode"; if it's supported by 546 * a platform, the create routine that called us can set 547 * the op to its routine to check whether a particular 548 * device supports it. 549 */ 550 p->can_set_rfmon_op = pcap_cant_set_rfmon; 551 552 initialize_ops(p); 553 554 /* put in some defaults*/ 555 pcap_set_snaplen(p, 65535); /* max packet size */ 556 p->opt.timeout = 0; /* no timeout specified */ 557 p->opt.buffer_size = 0; /* use the platform's default */ 558 p->opt.promisc = 0; 559 p->opt.rfmon = 0; 560 p->opt.immediate = 0; 561 p->opt.tstamp_type = -1; /* default to not setting time stamp type */ 562 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO; 563 return (p); 564 } 565 566 int 567 pcap_check_activated(pcap_t *p) 568 { 569 if (p->activated) { 570 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform " 571 " operation on activated capture"); 572 return (-1); 573 } 574 return (0); 575 } 576 577 int 578 pcap_set_snaplen(pcap_t *p, int snaplen) 579 { 580 if (pcap_check_activated(p)) 581 return (PCAP_ERROR_ACTIVATED); 582 p->snapshot = snaplen; 583 return (0); 584 } 585 586 int 587 pcap_set_promisc(pcap_t *p, int promisc) 588 { 589 if (pcap_check_activated(p)) 590 return (PCAP_ERROR_ACTIVATED); 591 p->opt.promisc = promisc; 592 return (0); 593 } 594 595 int 596 pcap_set_rfmon(pcap_t *p, int rfmon) 597 { 598 if (pcap_check_activated(p)) 599 return (PCAP_ERROR_ACTIVATED); 600 p->opt.rfmon = rfmon; 601 return (0); 602 } 603 604 int 605 pcap_set_timeout(pcap_t *p, int timeout_ms) 606 { 607 if (pcap_check_activated(p)) 608 return (PCAP_ERROR_ACTIVATED); 609 p->opt.timeout = timeout_ms; 610 return (0); 611 } 612 613 int 614 pcap_set_tstamp_type(pcap_t *p, int tstamp_type) 615 { 616 int i; 617 618 if (pcap_check_activated(p)) 619 return (PCAP_ERROR_ACTIVATED); 620 621 /* 622 * If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST; 623 * the default time stamp type is PCAP_TSTAMP_HOST. 624 */ 625 if (p->tstamp_type_count == 0) { 626 if (tstamp_type == PCAP_TSTAMP_HOST) { 627 p->opt.tstamp_type = tstamp_type; 628 return (0); 629 } 630 } else { 631 /* 632 * Check whether we claim to support this type of time stamp. 633 */ 634 for (i = 0; i < p->tstamp_type_count; i++) { 635 if (p->tstamp_type_list[i] == (u_int)tstamp_type) { 636 /* 637 * Yes. 638 */ 639 p->opt.tstamp_type = tstamp_type; 640 return (0); 641 } 642 } 643 } 644 645 /* 646 * We don't support this type of time stamp. 647 */ 648 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP); 649 } 650 651 int 652 pcap_set_immediate_mode(pcap_t *p, int immediate) 653 { 654 if (pcap_check_activated(p)) 655 return (PCAP_ERROR_ACTIVATED); 656 p->opt.immediate = immediate; 657 return (0); 658 } 659 660 int 661 pcap_set_buffer_size(pcap_t *p, int buffer_size) 662 { 663 if (pcap_check_activated(p)) 664 return (PCAP_ERROR_ACTIVATED); 665 p->opt.buffer_size = buffer_size; 666 return (0); 667 } 668 669 int 670 pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision) 671 { 672 int i; 673 674 if (pcap_check_activated(p)) 675 return (PCAP_ERROR_ACTIVATED); 676 677 /* 678 * If p->tstamp_precision_count is 0, we only support setting 679 * the time stamp precision to microsecond precision; every 680 * pcap module *MUST* support microsecond precision, even if 681 * it does so by converting the native precision to 682 * microseconds. 683 */ 684 if (p->tstamp_precision_count == 0) { 685 if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) { 686 p->opt.tstamp_precision = tstamp_precision; 687 return (0); 688 } 689 } else { 690 /* 691 * Check whether we claim to support this precision of 692 * time stamp. 693 */ 694 for (i = 0; i < p->tstamp_precision_count; i++) { 695 if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) { 696 /* 697 * Yes. 698 */ 699 p->opt.tstamp_precision = tstamp_precision; 700 return (0); 701 } 702 } 703 } 704 705 /* 706 * We don't support this time stamp precision. 707 */ 708 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP); 709 } 710 711 int 712 pcap_get_tstamp_precision(pcap_t *p) 713 { 714 return (p->opt.tstamp_precision); 715 } 716 717 int 718 pcap_activate(pcap_t *p) 719 { 720 int status; 721 722 /* 723 * Catch attempts to re-activate an already-activated 724 * pcap_t; this should, for example, catch code that 725 * calls pcap_open_live() followed by pcap_activate(), 726 * as some code that showed up in a Stack Exchange 727 * question did. 728 */ 729 if (pcap_check_activated(p)) 730 return (PCAP_ERROR_ACTIVATED); 731 status = p->activate_op(p); 732 if (status >= 0) 733 p->activated = 1; 734 else { 735 if (p->errbuf[0] == '\0') { 736 /* 737 * No error message supplied by the activate routine; 738 * for the benefit of programs that don't specially 739 * handle errors other than PCAP_ERROR, return the 740 * error message corresponding to the status. 741 */ 742 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s", 743 pcap_statustostr(status)); 744 } 745 746 /* 747 * Undo any operation pointer setting, etc. done by 748 * the activate operation. 749 */ 750 initialize_ops(p); 751 } 752 return (status); 753 } 754 755 pcap_t * 756 pcap_open_live(const char *source, int snaplen, int promisc, int to_ms, char *errbuf) 757 { 758 pcap_t *p; 759 int status; 760 761 p = pcap_create(source, errbuf); 762 if (p == NULL) 763 return (NULL); 764 status = pcap_set_snaplen(p, snaplen); 765 if (status < 0) 766 goto fail; 767 status = pcap_set_promisc(p, promisc); 768 if (status < 0) 769 goto fail; 770 status = pcap_set_timeout(p, to_ms); 771 if (status < 0) 772 goto fail; 773 /* 774 * Mark this as opened with pcap_open_live(), so that, for 775 * example, we show the full list of DLT_ values, rather 776 * than just the ones that are compatible with capturing 777 * when not in monitor mode. That allows existing applications 778 * to work the way they used to work, but allows new applications 779 * that know about the new open API to, for example, find out the 780 * DLT_ values that they can select without changing whether 781 * the adapter is in monitor mode or not. 782 */ 783 p->oldstyle = 1; 784 status = pcap_activate(p); 785 if (status < 0) 786 goto fail; 787 return (p); 788 fail: 789 if (status == PCAP_ERROR) 790 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source, 791 p->errbuf); 792 else if (status == PCAP_ERROR_NO_SUCH_DEVICE || 793 status == PCAP_ERROR_PERM_DENIED || 794 status == PCAP_ERROR_PROMISC_PERM_DENIED) 795 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%s)", source, 796 pcap_statustostr(status), p->errbuf); 797 else 798 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source, 799 pcap_statustostr(status)); 800 pcap_close(p); 801 return (NULL); 802 } 803 804 pcap_t * 805 pcap_open_offline_common(char *ebuf, size_t size) 806 { 807 pcap_t *p; 808 809 p = pcap_alloc_pcap_t(ebuf, size); 810 if (p == NULL) 811 return (NULL); 812 813 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO; 814 p->opt.source = strdup("(savefile)"); 815 if (p->opt.source == NULL) { 816 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 817 pcap_strerror(errno)); 818 free(p); 819 return (NULL); 820 } 821 822 return (p); 823 } 824 825 int 826 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 827 { 828 return (p->read_op(p, cnt, callback, user)); 829 } 830 831 /* 832 * XXX - is this necessary? 833 */ 834 int 835 pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 836 { 837 838 return (p->read_op(p, cnt, callback, user)); 839 } 840 841 int 842 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 843 { 844 register int n; 845 846 for (;;) { 847 if (p->rfile != NULL) { 848 /* 849 * 0 means EOF, so don't loop if we get 0. 850 */ 851 n = pcap_offline_read(p, cnt, callback, user); 852 } else { 853 /* 854 * XXX keep reading until we get something 855 * (or an error occurs) 856 */ 857 do { 858 n = p->read_op(p, cnt, callback, user); 859 } while (n == 0); 860 } 861 if (n <= 0) 862 return (n); 863 if (cnt > 0) { 864 cnt -= n; 865 if (cnt <= 0) 866 return (0); 867 } 868 } 869 } 870 871 /* 872 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate. 873 */ 874 void 875 pcap_breakloop(pcap_t *p) 876 { 877 p->break_loop = 1; 878 } 879 880 int 881 pcap_datalink(pcap_t *p) 882 { 883 if (!p->activated) 884 return (PCAP_ERROR_NOT_ACTIVATED); 885 return (p->linktype); 886 } 887 888 int 889 pcap_datalink_ext(pcap_t *p) 890 { 891 if (!p->activated) 892 return (PCAP_ERROR_NOT_ACTIVATED); 893 return (p->linktype_ext); 894 } 895 896 int 897 pcap_list_datalinks(pcap_t *p, int **dlt_buffer) 898 { 899 if (!p->activated) 900 return (PCAP_ERROR_NOT_ACTIVATED); 901 if (p->dlt_count == 0) { 902 /* 903 * We couldn't fetch the list of DLTs, which means 904 * this platform doesn't support changing the 905 * DLT for an interface. Return a list of DLTs 906 * containing only the DLT this device supports. 907 */ 908 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); 909 if (*dlt_buffer == NULL) { 910 (void)snprintf(p->errbuf, sizeof(p->errbuf), 911 "malloc: %s", pcap_strerror(errno)); 912 return (PCAP_ERROR); 913 } 914 **dlt_buffer = p->linktype; 915 return (1); 916 } else { 917 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count); 918 if (*dlt_buffer == NULL) { 919 (void)snprintf(p->errbuf, sizeof(p->errbuf), 920 "malloc: %s", pcap_strerror(errno)); 921 return (PCAP_ERROR); 922 } 923 (void)memcpy(*dlt_buffer, p->dlt_list, 924 sizeof(**dlt_buffer) * p->dlt_count); 925 return (p->dlt_count); 926 } 927 } 928 929 /* 930 * In Windows, you might have a library built with one version of the 931 * C runtime library and an application built with another version of 932 * the C runtime library, which means that the library might use one 933 * version of malloc() and free() and the application might use another 934 * version of malloc() and free(). If so, that means something 935 * allocated by the library cannot be freed by the application, so we 936 * need to have a pcap_free_datalinks() routine to free up the list 937 * allocated by pcap_list_datalinks(), even though it's just a wrapper 938 * around free(). 939 */ 940 void 941 pcap_free_datalinks(int *dlt_list) 942 { 943 free(dlt_list); 944 } 945 946 int 947 pcap_set_datalink(pcap_t *p, int dlt) 948 { 949 int i; 950 const char *dlt_name; 951 952 if (p->dlt_count == 0 || p->set_datalink_op == NULL) { 953 /* 954 * We couldn't fetch the list of DLTs, or we don't 955 * have a "set datalink" operation, which means 956 * this platform doesn't support changing the 957 * DLT for an interface. Check whether the new 958 * DLT is the one this interface supports. 959 */ 960 if (p->linktype != dlt) 961 goto unsupported; 962 963 /* 964 * It is, so there's nothing we need to do here. 965 */ 966 return (0); 967 } 968 for (i = 0; i < p->dlt_count; i++) 969 if (p->dlt_list[i] == (u_int)dlt) 970 break; 971 if (i >= p->dlt_count) 972 goto unsupported; 973 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB && 974 dlt == DLT_DOCSIS) { 975 /* 976 * This is presumably an Ethernet device, as the first 977 * link-layer type it offers is DLT_EN10MB, and the only 978 * other type it offers is DLT_DOCSIS. That means that 979 * we can't tell the driver to supply DOCSIS link-layer 980 * headers - we're just pretending that's what we're 981 * getting, as, presumably, we're capturing on a dedicated 982 * link to a Cisco Cable Modem Termination System, and 983 * it's putting raw DOCSIS frames on the wire inside low-level 984 * Ethernet framing. 985 */ 986 p->linktype = dlt; 987 return (0); 988 } 989 if (p->set_datalink_op(p, dlt) == -1) 990 return (-1); 991 p->linktype = dlt; 992 return (0); 993 994 unsupported: 995 dlt_name = pcap_datalink_val_to_name(dlt); 996 if (dlt_name != NULL) { 997 (void) snprintf(p->errbuf, sizeof(p->errbuf), 998 "%s is not one of the DLTs supported by this device", 999 dlt_name); 1000 } else { 1001 (void) snprintf(p->errbuf, sizeof(p->errbuf), 1002 "DLT %d is not one of the DLTs supported by this device", 1003 dlt); 1004 } 1005 return (-1); 1006 } 1007 1008 /* 1009 * This array is designed for mapping upper and lower case letter 1010 * together for a case independent comparison. The mappings are 1011 * based upon ascii character sequences. 1012 */ 1013 static const u_char charmap[] = { 1014 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003', 1015 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007', 1016 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013', 1017 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017', 1018 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023', 1019 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027', 1020 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033', 1021 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037', 1022 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043', 1023 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047', 1024 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053', 1025 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057', 1026 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063', 1027 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067', 1028 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073', 1029 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077', 1030 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143', 1031 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 1032 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 1033 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 1034 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 1035 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 1036 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133', 1037 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137', 1038 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143', 1039 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 1040 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 1041 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 1042 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 1043 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 1044 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173', 1045 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177', 1046 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203', 1047 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207', 1048 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213', 1049 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217', 1050 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223', 1051 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227', 1052 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233', 1053 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237', 1054 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243', 1055 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247', 1056 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253', 1057 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257', 1058 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263', 1059 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267', 1060 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273', 1061 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277', 1062 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343', 1063 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 1064 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 1065 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 1066 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 1067 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 1068 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333', 1069 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337', 1070 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343', 1071 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 1072 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 1073 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 1074 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 1075 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 1076 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373', 1077 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377', 1078 }; 1079 1080 int 1081 pcap_strcasecmp(const char *s1, const char *s2) 1082 { 1083 register const u_char *cm = charmap, 1084 *us1 = (const u_char *)s1, 1085 *us2 = (const u_char *)s2; 1086 1087 while (cm[*us1] == cm[*us2++]) 1088 if (*us1++ == '\0') 1089 return(0); 1090 return (cm[*us1] - cm[*--us2]); 1091 } 1092 1093 struct dlt_choice { 1094 const char *name; 1095 const char *description; 1096 int dlt; 1097 }; 1098 1099 #define DLT_CHOICE(code, description) { #code, description, code } 1100 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 } 1101 1102 static struct dlt_choice dlt_choices[] = { 1103 DLT_CHOICE(DLT_NULL, "BSD loopback"), 1104 DLT_CHOICE(DLT_EN10MB, "Ethernet"), 1105 DLT_CHOICE(DLT_IEEE802, "Token ring"), 1106 DLT_CHOICE(DLT_ARCNET, "BSD ARCNET"), 1107 DLT_CHOICE(DLT_SLIP, "SLIP"), 1108 DLT_CHOICE(DLT_PPP, "PPP"), 1109 DLT_CHOICE(DLT_FDDI, "FDDI"), 1110 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"), 1111 DLT_CHOICE(DLT_RAW, "Raw IP"), 1112 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"), 1113 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"), 1114 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"), 1115 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"), 1116 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"), 1117 DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"), 1118 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"), 1119 DLT_CHOICE(DLT_IEEE802_11, "802.11"), 1120 DLT_CHOICE(DLT_FRELAY, "Frame Relay"), 1121 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"), 1122 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"), 1123 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"), 1124 DLT_CHOICE(DLT_LTALK, "Localtalk"), 1125 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"), 1126 DLT_CHOICE(DLT_PFSYNC, "Packet filter state syncing"), 1127 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"), 1128 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"), 1129 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"), 1130 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radiotap header"), 1131 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"), 1132 DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"), 1133 DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"), 1134 DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"), 1135 DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"), 1136 DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"), 1137 DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"), 1138 DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"), 1139 DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"), 1140 DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"), 1141 DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"), 1142 DLT_CHOICE(DLT_MTP2, "SS7 MTP2"), 1143 DLT_CHOICE(DLT_MTP3, "SS7 MTP3"), 1144 DLT_CHOICE(DLT_SCCP, "SS7 SCCP"), 1145 DLT_CHOICE(DLT_DOCSIS, "DOCSIS"), 1146 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"), 1147 DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"), 1148 DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"), 1149 DLT_CHOICE(DLT_BACNET_MS_TP, "BACnet MS/TP"), 1150 DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"), 1151 DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"), 1152 DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"), 1153 DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"), 1154 DLT_CHOICE(DLT_GPF_T, "GPF-T"), 1155 DLT_CHOICE(DLT_GPF_F, "GPF-F"), 1156 DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"), 1157 DLT_CHOICE(DLT_ERF_ETH, "Ethernet with Endace ERF header"), 1158 DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"), 1159 DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"), 1160 DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"), 1161 DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"), 1162 DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"), 1163 DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"), 1164 DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"), 1165 DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"), 1166 DLT_CHOICE(DLT_A429, "Arinc 429"), 1167 DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"), 1168 DLT_CHOICE(DLT_USB, "USB"), 1169 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"), 1170 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"), 1171 DLT_CHOICE(DLT_USB_LINUX, "USB with Linux header"), 1172 DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"), 1173 DLT_CHOICE(DLT_IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"), 1174 DLT_CHOICE(DLT_PPI, "Per-Packet Information"), 1175 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"), 1176 DLT_CHOICE(DLT_JUNIPER_ISM, "Juniper Integrated Service Module"), 1177 DLT_CHOICE(DLT_IEEE802_15_4, "IEEE 802.15.4 with FCS"), 1178 DLT_CHOICE(DLT_SITA, "SITA pseudo-header"), 1179 DLT_CHOICE(DLT_ERF, "Endace ERF header"), 1180 DLT_CHOICE(DLT_RAIF1, "Ethernet with u10 Networks pseudo-header"), 1181 DLT_CHOICE(DLT_IPMB, "IPMB"), 1182 DLT_CHOICE(DLT_JUNIPER_ST, "Juniper Secure Tunnel"), 1183 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"), 1184 DLT_CHOICE(DLT_AX25_KISS, "AX.25 with KISS header"), 1185 DLT_CHOICE(DLT_IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"), 1186 DLT_CHOICE(DLT_MPLS, "MPLS with label as link-layer header"), 1187 DLT_CHOICE(DLT_USB_LINUX_MMAPPED, "USB with padded Linux header"), 1188 DLT_CHOICE(DLT_DECT, "DECT"), 1189 DLT_CHOICE(DLT_AOS, "AOS Space Data Link protocol"), 1190 DLT_CHOICE(DLT_WIHART, "Wireless HART"), 1191 DLT_CHOICE(DLT_FC_2, "Fibre Channel FC-2"), 1192 DLT_CHOICE(DLT_FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"), 1193 DLT_CHOICE(DLT_IPNET, "Solaris ipnet"), 1194 DLT_CHOICE(DLT_CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"), 1195 DLT_CHOICE(DLT_IPV4, "Raw IPv4"), 1196 DLT_CHOICE(DLT_IPV6, "Raw IPv6"), 1197 DLT_CHOICE(DLT_IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"), 1198 DLT_CHOICE(DLT_JUNIPER_VS, "Juniper Virtual Server"), 1199 DLT_CHOICE(DLT_JUNIPER_SRX_E2E, "Juniper SRX E2E"), 1200 DLT_CHOICE(DLT_JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"), 1201 DLT_CHOICE(DLT_DVB_CI, "DVB-CI"), 1202 DLT_CHOICE(DLT_JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"), 1203 DLT_CHOICE(DLT_NFLOG, "Linux netfilter log messages"), 1204 DLT_CHOICE(DLT_NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"), 1205 DLT_CHOICE(DLT_NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"), 1206 DLT_CHOICE(DLT_IPOIB, "RFC 4391 IP-over-Infiniband"), 1207 DLT_CHOICE(DLT_DBUS, "D-Bus"), 1208 DLT_CHOICE_SENTINEL 1209 }; 1210 1211 int 1212 pcap_datalink_name_to_val(const char *name) 1213 { 1214 int i; 1215 1216 for (i = 0; dlt_choices[i].name != NULL; i++) { 1217 if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1, 1218 name) == 0) 1219 return (dlt_choices[i].dlt); 1220 } 1221 return (-1); 1222 } 1223 1224 const char * 1225 pcap_datalink_val_to_name(int dlt) 1226 { 1227 int i; 1228 1229 for (i = 0; dlt_choices[i].name != NULL; i++) { 1230 if (dlt_choices[i].dlt == dlt) 1231 return (dlt_choices[i].name + sizeof("DLT_") - 1); 1232 } 1233 return (NULL); 1234 } 1235 1236 const char * 1237 pcap_datalink_val_to_description(int dlt) 1238 { 1239 int i; 1240 1241 for (i = 0; dlt_choices[i].name != NULL; i++) { 1242 if (dlt_choices[i].dlt == dlt) 1243 return (dlt_choices[i].description); 1244 } 1245 return (NULL); 1246 } 1247 1248 struct tstamp_type_choice { 1249 const char *name; 1250 const char *description; 1251 int type; 1252 }; 1253 1254 static struct tstamp_type_choice tstamp_type_choices[] = { 1255 { "host", "Host", PCAP_TSTAMP_HOST }, 1256 { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC }, 1257 { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC }, 1258 { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER }, 1259 { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED }, 1260 { NULL, NULL, 0 } 1261 }; 1262 1263 int 1264 pcap_tstamp_type_name_to_val(const char *name) 1265 { 1266 int i; 1267 1268 for (i = 0; tstamp_type_choices[i].name != NULL; i++) { 1269 if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0) 1270 return (tstamp_type_choices[i].type); 1271 } 1272 return (PCAP_ERROR); 1273 } 1274 1275 const char * 1276 pcap_tstamp_type_val_to_name(int tstamp_type) 1277 { 1278 int i; 1279 1280 for (i = 0; tstamp_type_choices[i].name != NULL; i++) { 1281 if (tstamp_type_choices[i].type == tstamp_type) 1282 return (tstamp_type_choices[i].name); 1283 } 1284 return (NULL); 1285 } 1286 1287 const char * 1288 pcap_tstamp_type_val_to_description(int tstamp_type) 1289 { 1290 int i; 1291 1292 for (i = 0; tstamp_type_choices[i].name != NULL; i++) { 1293 if (tstamp_type_choices[i].type == tstamp_type) 1294 return (tstamp_type_choices[i].description); 1295 } 1296 return (NULL); 1297 } 1298 1299 int 1300 pcap_snapshot(pcap_t *p) 1301 { 1302 if (!p->activated) 1303 return (PCAP_ERROR_NOT_ACTIVATED); 1304 return (p->snapshot); 1305 } 1306 1307 int 1308 pcap_is_swapped(pcap_t *p) 1309 { 1310 if (!p->activated) 1311 return (PCAP_ERROR_NOT_ACTIVATED); 1312 return (p->swapped); 1313 } 1314 1315 int 1316 pcap_major_version(pcap_t *p) 1317 { 1318 if (!p->activated) 1319 return (PCAP_ERROR_NOT_ACTIVATED); 1320 return (p->version_major); 1321 } 1322 1323 int 1324 pcap_minor_version(pcap_t *p) 1325 { 1326 if (!p->activated) 1327 return (PCAP_ERROR_NOT_ACTIVATED); 1328 return (p->version_minor); 1329 } 1330 1331 FILE * 1332 pcap_file(pcap_t *p) 1333 { 1334 return (p->rfile); 1335 } 1336 1337 int 1338 pcap_fileno(pcap_t *p) 1339 { 1340 #ifndef WIN32 1341 return (p->fd); 1342 #else 1343 if (p->adapter != NULL) 1344 return ((int)(DWORD)p->adapter->hFile); 1345 else 1346 return (PCAP_ERROR); 1347 #endif 1348 } 1349 1350 #if !defined(WIN32) && !defined(MSDOS) 1351 int 1352 pcap_get_selectable_fd(pcap_t *p) 1353 { 1354 return (p->selectable_fd); 1355 } 1356 #endif 1357 1358 void 1359 pcap_perror(pcap_t *p, char *prefix) 1360 { 1361 fprintf(stderr, "%s: %s\n", prefix, p->errbuf); 1362 } 1363 1364 char * 1365 pcap_geterr(pcap_t *p) 1366 { 1367 return (p->errbuf); 1368 } 1369 1370 int 1371 pcap_getnonblock(pcap_t *p, char *errbuf) 1372 { 1373 int ret; 1374 1375 ret = p->getnonblock_op(p, errbuf); 1376 if (ret == -1) { 1377 /* 1378 * In case somebody depended on the bug wherein 1379 * the error message was put into p->errbuf 1380 * by pcap_getnonblock_fd(). 1381 */ 1382 strlcpy(p->errbuf, errbuf, PCAP_ERRBUF_SIZE); 1383 } 1384 return (ret); 1385 } 1386 1387 /* 1388 * Get the current non-blocking mode setting, under the assumption that 1389 * it's just the standard POSIX non-blocking flag. 1390 * 1391 * We don't look at "p->nonblock", in case somebody tweaked the FD 1392 * directly. 1393 */ 1394 #if !defined(WIN32) && !defined(MSDOS) 1395 int 1396 pcap_getnonblock_fd(pcap_t *p, char *errbuf) 1397 { 1398 int fdflags; 1399 1400 fdflags = fcntl(p->fd, F_GETFL, 0); 1401 if (fdflags == -1) { 1402 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 1403 pcap_strerror(errno)); 1404 return (-1); 1405 } 1406 if (fdflags & O_NONBLOCK) 1407 return (1); 1408 else 1409 return (0); 1410 } 1411 #endif 1412 1413 int 1414 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) 1415 { 1416 int ret; 1417 1418 ret = p->setnonblock_op(p, nonblock, errbuf); 1419 if (ret == -1) { 1420 /* 1421 * In case somebody depended on the bug wherein 1422 * the error message was put into p->errbuf 1423 * by pcap_setnonblock_fd(). 1424 */ 1425 strlcpy(p->errbuf, errbuf, PCAP_ERRBUF_SIZE); 1426 } 1427 return (ret); 1428 } 1429 1430 #if !defined(WIN32) && !defined(MSDOS) 1431 /* 1432 * Set non-blocking mode, under the assumption that it's just the 1433 * standard POSIX non-blocking flag. (This can be called by the 1434 * per-platform non-blocking-mode routine if that routine also 1435 * needs to do some additional work.) 1436 */ 1437 int 1438 pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf) 1439 { 1440 int fdflags; 1441 1442 fdflags = fcntl(p->fd, F_GETFL, 0); 1443 if (fdflags == -1) { 1444 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 1445 pcap_strerror(errno)); 1446 return (-1); 1447 } 1448 if (nonblock) 1449 fdflags |= O_NONBLOCK; 1450 else 1451 fdflags &= ~O_NONBLOCK; 1452 if (fcntl(p->fd, F_SETFL, fdflags) == -1) { 1453 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s", 1454 pcap_strerror(errno)); 1455 return (-1); 1456 } 1457 return (0); 1458 } 1459 #endif 1460 1461 #ifdef WIN32 1462 /* 1463 * Generate a string for the last Win32-specific error (i.e. an error generated when 1464 * calling a Win32 API). 1465 * For errors occurred during standard C calls, we still use pcap_strerror() 1466 */ 1467 char * 1468 pcap_win32strerror(void) 1469 { 1470 DWORD error; 1471 static char errbuf[PCAP_ERRBUF_SIZE+1]; 1472 int errlen; 1473 char *p; 1474 1475 error = GetLastError(); 1476 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf, 1477 PCAP_ERRBUF_SIZE, NULL); 1478 1479 /* 1480 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the 1481 * message. Get rid of it. 1482 */ 1483 errlen = strlen(errbuf); 1484 if (errlen >= 2) { 1485 errbuf[errlen - 1] = '\0'; 1486 errbuf[errlen - 2] = '\0'; 1487 } 1488 p = strchr(errbuf, '\0'); 1489 snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error); 1490 return (errbuf); 1491 } 1492 #endif 1493 1494 /* 1495 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values. 1496 */ 1497 const char * 1498 pcap_statustostr(int errnum) 1499 { 1500 static char ebuf[15+10+1]; 1501 1502 switch (errnum) { 1503 1504 case PCAP_WARNING: 1505 return("Generic warning"); 1506 1507 case PCAP_WARNING_TSTAMP_TYPE_NOTSUP: 1508 return ("That type of time stamp is not supported by that device"); 1509 1510 case PCAP_WARNING_PROMISC_NOTSUP: 1511 return ("That device doesn't support promiscuous mode"); 1512 1513 case PCAP_ERROR: 1514 return("Generic error"); 1515 1516 case PCAP_ERROR_BREAK: 1517 return("Loop terminated by pcap_breakloop"); 1518 1519 case PCAP_ERROR_NOT_ACTIVATED: 1520 return("The pcap_t has not been activated"); 1521 1522 case PCAP_ERROR_ACTIVATED: 1523 return ("The setting can't be changed after the pcap_t is activated"); 1524 1525 case PCAP_ERROR_NO_SUCH_DEVICE: 1526 return ("No such device exists"); 1527 1528 case PCAP_ERROR_RFMON_NOTSUP: 1529 return ("That device doesn't support monitor mode"); 1530 1531 case PCAP_ERROR_NOT_RFMON: 1532 return ("That operation is supported only in monitor mode"); 1533 1534 case PCAP_ERROR_PERM_DENIED: 1535 return ("You don't have permission to capture on that device"); 1536 1537 case PCAP_ERROR_IFACE_NOT_UP: 1538 return ("That device is not up"); 1539 1540 case PCAP_ERROR_CANTSET_TSTAMP_TYPE: 1541 return ("That device doesn't support setting the time stamp type"); 1542 1543 case PCAP_ERROR_PROMISC_PERM_DENIED: 1544 return ("You don't have permission to capture in promiscuous mode on that device"); 1545 1546 case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP: 1547 return ("That device doesn't support that time stamp precision"); 1548 } 1549 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 1550 return(ebuf); 1551 } 1552 1553 /* 1554 * Not all systems have strerror(). 1555 */ 1556 const char * 1557 pcap_strerror(int errnum) 1558 { 1559 #ifdef HAVE_STRERROR 1560 return (strerror(errnum)); 1561 #else 1562 extern int sys_nerr; 1563 extern const char *const sys_errlist[]; 1564 static char ebuf[15+10+1]; 1565 1566 if ((unsigned int)errnum < sys_nerr) 1567 return ((char *)sys_errlist[errnum]); 1568 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 1569 return(ebuf); 1570 #endif 1571 } 1572 1573 int 1574 pcap_setfilter(pcap_t *p, struct bpf_program *fp) 1575 { 1576 return (p->setfilter_op(p, fp)); 1577 } 1578 1579 /* 1580 * Set direction flag, which controls whether we accept only incoming 1581 * packets, only outgoing packets, or both. 1582 * Note that, depending on the platform, some or all direction arguments 1583 * might not be supported. 1584 */ 1585 int 1586 pcap_setdirection(pcap_t *p, pcap_direction_t d) 1587 { 1588 if (p->setdirection_op == NULL) { 1589 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1590 "Setting direction is not implemented on this platform"); 1591 return (-1); 1592 } else 1593 return (p->setdirection_op(p, d)); 1594 } 1595 1596 int 1597 pcap_stats(pcap_t *p, struct pcap_stat *ps) 1598 { 1599 return (p->stats_op(p, ps)); 1600 } 1601 1602 static int 1603 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_) 1604 { 1605 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1606 "Statistics aren't available from a pcap_open_dead pcap_t"); 1607 return (-1); 1608 } 1609 1610 #ifdef WIN32 1611 int 1612 pcap_setbuff(pcap_t *p, int dim) 1613 { 1614 return (p->setbuff_op(p, dim)); 1615 } 1616 1617 static int 1618 pcap_setbuff_dead(pcap_t *p, int dim) 1619 { 1620 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1621 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t"); 1622 return (-1); 1623 } 1624 1625 int 1626 pcap_setmode(pcap_t *p, int mode) 1627 { 1628 return (p->setmode_op(p, mode)); 1629 } 1630 1631 static int 1632 pcap_setmode_dead(pcap_t *p, int mode) 1633 { 1634 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1635 "impossible to set mode on a pcap_open_dead pcap_t"); 1636 return (-1); 1637 } 1638 1639 int 1640 pcap_setmintocopy(pcap_t *p, int size) 1641 { 1642 return (p->setmintocopy_op(p, size)); 1643 } 1644 1645 Adapter * 1646 pcap_get_adapter(pcap_t *p) 1647 { 1648 return (p->getadapter_op(p)); 1649 } 1650 1651 static int 1652 pcap_setmintocopy_dead(pcap_t *p, int size) 1653 { 1654 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1655 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t"); 1656 return (-1); 1657 } 1658 #endif 1659 1660 /* 1661 * On some platforms, we need to clean up promiscuous or monitor mode 1662 * when we close a device - and we want that to happen even if the 1663 * application just exits without explicitl closing devices. 1664 * On those platforms, we need to register a "close all the pcaps" 1665 * routine to be called when we exit, and need to maintain a list of 1666 * pcaps that need to be closed to clean up modes. 1667 * 1668 * XXX - not thread-safe. 1669 */ 1670 1671 /* 1672 * List of pcaps on which we've done something that needs to be 1673 * cleaned up. 1674 * If there are any such pcaps, we arrange to call "pcap_close_all()" 1675 * when we exit, and have it close all of them. 1676 */ 1677 static struct pcap *pcaps_to_close; 1678 1679 /* 1680 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to 1681 * be called on exit. 1682 */ 1683 static int did_atexit; 1684 1685 static void 1686 pcap_close_all(void) 1687 { 1688 struct pcap *handle; 1689 1690 while ((handle = pcaps_to_close) != NULL) 1691 pcap_close(handle); 1692 } 1693 1694 int 1695 pcap_do_addexit(pcap_t *p) 1696 { 1697 /* 1698 * If we haven't already done so, arrange to have 1699 * "pcap_close_all()" called when we exit. 1700 */ 1701 if (!did_atexit) { 1702 if (atexit(pcap_close_all) == -1) { 1703 /* 1704 * "atexit()" failed; let our caller know. 1705 */ 1706 strncpy(p->errbuf, "atexit failed", 1707 PCAP_ERRBUF_SIZE); 1708 return (0); 1709 } 1710 did_atexit = 1; 1711 } 1712 return (1); 1713 } 1714 1715 void 1716 pcap_add_to_pcaps_to_close(pcap_t *p) 1717 { 1718 p->next = pcaps_to_close; 1719 pcaps_to_close = p; 1720 } 1721 1722 void 1723 pcap_remove_from_pcaps_to_close(pcap_t *p) 1724 { 1725 pcap_t *pc, *prevpc; 1726 1727 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL; 1728 prevpc = pc, pc = pc->next) { 1729 if (pc == p) { 1730 /* 1731 * Found it. Remove it from the list. 1732 */ 1733 if (prevpc == NULL) { 1734 /* 1735 * It was at the head of the list. 1736 */ 1737 pcaps_to_close = pc->next; 1738 } else { 1739 /* 1740 * It was in the middle of the list. 1741 */ 1742 prevpc->next = pc->next; 1743 } 1744 break; 1745 } 1746 } 1747 } 1748 1749 void 1750 pcap_cleanup_live_common(pcap_t *p) 1751 { 1752 if (p->buffer != NULL) { 1753 free(p->buffer); 1754 p->buffer = NULL; 1755 } 1756 if (p->dlt_list != NULL) { 1757 free(p->dlt_list); 1758 p->dlt_list = NULL; 1759 p->dlt_count = 0; 1760 } 1761 if (p->tstamp_type_list != NULL) { 1762 free(p->tstamp_type_list); 1763 p->tstamp_type_list = NULL; 1764 p->tstamp_type_count = 0; 1765 } 1766 if (p->tstamp_precision_list != NULL) { 1767 free(p->tstamp_precision_list); 1768 p->tstamp_precision_list = NULL; 1769 p->tstamp_precision_count = 0; 1770 } 1771 pcap_freecode(&p->fcode); 1772 #if !defined(WIN32) && !defined(MSDOS) 1773 if (p->fd >= 0) { 1774 close(p->fd); 1775 p->fd = -1; 1776 } 1777 p->selectable_fd = -1; 1778 #endif 1779 } 1780 1781 static void 1782 pcap_cleanup_dead(pcap_t *p _U_) 1783 { 1784 /* Nothing to do. */ 1785 } 1786 1787 pcap_t * 1788 pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision) 1789 { 1790 pcap_t *p; 1791 1792 switch (precision) { 1793 1794 case PCAP_TSTAMP_PRECISION_MICRO: 1795 case PCAP_TSTAMP_PRECISION_NANO: 1796 break; 1797 1798 default: 1799 return NULL; 1800 } 1801 p = malloc(sizeof(*p)); 1802 if (p == NULL) 1803 return NULL; 1804 memset (p, 0, sizeof(*p)); 1805 p->snapshot = snaplen; 1806 p->linktype = linktype; 1807 p->opt.tstamp_precision = precision; 1808 p->stats_op = pcap_stats_dead; 1809 #ifdef WIN32 1810 p->setbuff_op = pcap_setbuff_dead; 1811 p->setmode_op = pcap_setmode_dead; 1812 p->setmintocopy_op = pcap_setmintocopy_dead; 1813 #endif 1814 p->cleanup_op = pcap_cleanup_dead; 1815 p->activated = 1; 1816 return (p); 1817 } 1818 1819 pcap_t * 1820 pcap_open_dead(int linktype, int snaplen) 1821 { 1822 return (pcap_open_dead_with_tstamp_precision(linktype, snaplen, 1823 PCAP_TSTAMP_PRECISION_MICRO)); 1824 } 1825 1826 /* 1827 * API compatible with WinPcap's "send a packet" routine - returns -1 1828 * on error, 0 otherwise. 1829 * 1830 * XXX - what if we get a short write? 1831 */ 1832 int 1833 pcap_sendpacket(pcap_t *p, const u_char *buf, int size) 1834 { 1835 if (p->inject_op(p, buf, size) == -1) 1836 return (-1); 1837 return (0); 1838 } 1839 1840 /* 1841 * API compatible with OpenBSD's "send a packet" routine - returns -1 on 1842 * error, number of bytes written otherwise. 1843 */ 1844 int 1845 pcap_inject(pcap_t *p, const void *buf, size_t size) 1846 { 1847 return (p->inject_op(p, buf, size)); 1848 } 1849 1850 void 1851 pcap_close(pcap_t *p) 1852 { 1853 if (p->opt.source != NULL) 1854 free(p->opt.source); 1855 p->cleanup_op(p); 1856 free(p); 1857 } 1858 1859 /* 1860 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw 1861 * data for the packet, check whether the packet passes the filter. 1862 * Returns the return value of the filter program, which will be zero if 1863 * the packet doesn't pass and non-zero if the packet does pass. 1864 */ 1865 int 1866 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h, 1867 const u_char *pkt) 1868 { 1869 const struct bpf_insn *fcode = fp->bf_insns; 1870 1871 if (fcode != NULL) 1872 return (bpf_filter(fcode, pkt, h->len, h->caplen)); 1873 else 1874 return (0); 1875 } 1876 1877 /* 1878 * We make the version string static, and return a pointer to it, rather 1879 * than exporting the version string directly. On at least some UNIXes, 1880 * if you import data from a shared library into an program, the data is 1881 * bound into the program binary, so if the string in the version of the 1882 * library with which the program was linked isn't the same as the 1883 * string in the version of the library with which the program is being 1884 * run, various undesirable things may happen (warnings, the string 1885 * being the one from the version of the library with which the program 1886 * was linked, or even weirder things, such as the string being the one 1887 * from the library but being truncated). 1888 */ 1889 #ifdef HAVE_VERSION_H 1890 #include "version.h" 1891 #else 1892 static const char pcap_version_string[] = "libpcap version 1.x.y"; 1893 #endif 1894 1895 #ifdef WIN32 1896 /* 1897 * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap 1898 * version numbers when building WinPcap. (It'd be nice to do so for 1899 * the packet.dll version number as well.) 1900 */ 1901 static const char wpcap_version_string[] = "4.0"; 1902 static const char pcap_version_string_fmt[] = 1903 "WinPcap version %s, based on %s"; 1904 static const char pcap_version_string_packet_dll_fmt[] = 1905 "WinPcap version %s (packet.dll version %s), based on %s"; 1906 static char *full_pcap_version_string; 1907 1908 const char * 1909 pcap_lib_version(void) 1910 { 1911 char *packet_version_string; 1912 size_t full_pcap_version_string_len; 1913 1914 if (full_pcap_version_string == NULL) { 1915 /* 1916 * Generate the version string. 1917 */ 1918 packet_version_string = PacketGetVersion(); 1919 if (strcmp(wpcap_version_string, packet_version_string) == 0) { 1920 /* 1921 * WinPcap version string and packet.dll version 1922 * string are the same; just report the WinPcap 1923 * version. 1924 */ 1925 full_pcap_version_string_len = 1926 (sizeof pcap_version_string_fmt - 4) + 1927 strlen(wpcap_version_string) + 1928 strlen(pcap_version_string); 1929 full_pcap_version_string = 1930 malloc(full_pcap_version_string_len); 1931 if (full_pcap_version_string == NULL) 1932 return (NULL); 1933 sprintf(full_pcap_version_string, 1934 pcap_version_string_fmt, wpcap_version_string, 1935 pcap_version_string); 1936 } else { 1937 /* 1938 * WinPcap version string and packet.dll version 1939 * string are different; that shouldn't be the 1940 * case (the two libraries should come from the 1941 * same version of WinPcap), so we report both 1942 * versions. 1943 */ 1944 full_pcap_version_string_len = 1945 (sizeof pcap_version_string_packet_dll_fmt - 6) + 1946 strlen(wpcap_version_string) + 1947 strlen(packet_version_string) + 1948 strlen(pcap_version_string); 1949 full_pcap_version_string = malloc(full_pcap_version_string_len); 1950 if (full_pcap_version_string == NULL) 1951 return (NULL); 1952 sprintf(full_pcap_version_string, 1953 pcap_version_string_packet_dll_fmt, 1954 wpcap_version_string, packet_version_string, 1955 pcap_version_string); 1956 } 1957 } 1958 return (full_pcap_version_string); 1959 } 1960 1961 #elif defined(MSDOS) 1962 1963 static char *full_pcap_version_string; 1964 1965 const char * 1966 pcap_lib_version (void) 1967 { 1968 char *packet_version_string; 1969 size_t full_pcap_version_string_len; 1970 static char dospfx[] = "DOS-"; 1971 1972 if (full_pcap_version_string == NULL) { 1973 /* 1974 * Generate the version string. 1975 */ 1976 full_pcap_version_string_len = 1977 sizeof dospfx + strlen(pcap_version_string); 1978 full_pcap_version_string = 1979 malloc(full_pcap_version_string_len); 1980 if (full_pcap_version_string == NULL) 1981 return (NULL); 1982 strcpy(full_pcap_version_string, dospfx); 1983 strcat(full_pcap_version_string, pcap_version_string); 1984 } 1985 return (full_pcap_version_string); 1986 } 1987 1988 #else /* UN*X */ 1989 1990 const char * 1991 pcap_lib_version(void) 1992 { 1993 return (pcap_version_string); 1994 } 1995 #endif 1996