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