1 /* $NetBSD: pcap.c,v 1.10 2020/03/29 19:49:26 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 #include <sys/cdefs.h> 37 __RCSID("$NetBSD: pcap.c,v 1.10 2020/03/29 19:49:26 christos Exp $"); 38 39 #ifdef HAVE_CONFIG_H 40 #include <config.h> 41 #endif 42 43 #include <pcap-types.h> 44 #ifndef _WIN32 45 #include <sys/param.h> 46 #ifndef MSDOS 47 #include <sys/file.h> 48 #endif 49 #include <sys/ioctl.h> 50 #include <sys/socket.h> 51 #ifdef HAVE_SYS_SOCKIO_H 52 #include <sys/sockio.h> 53 #endif 54 55 struct mbuf; /* Squelch compiler warnings on some platforms for */ 56 struct rtentry; /* declarations in <net/if.h> */ 57 #include <net/if.h> 58 #include <netinet/in.h> 59 #endif /* _WIN32 */ 60 61 #include <ctype.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__) 66 #include <unistd.h> 67 #endif 68 #include <fcntl.h> 69 #include <errno.h> 70 #ifdef HAVE_LIMITS_H 71 #include <limits.h> 72 #else 73 #define INT_MAX 2147483647 74 #endif 75 76 #ifdef HAVE_OS_PROTO_H 77 #include "os-proto.h" 78 #endif 79 80 #ifdef MSDOS 81 #include "pcap-dos.h" 82 #endif 83 84 #include "pcap-int.h" 85 86 #include "optimize.h" 87 88 #ifdef HAVE_DAG_API 89 #include "pcap-dag.h" 90 #endif /* HAVE_DAG_API */ 91 92 #ifdef HAVE_SEPTEL_API 93 #include "pcap-septel.h" 94 #endif /* HAVE_SEPTEL_API */ 95 96 #ifdef HAVE_SNF_API 97 #include "pcap-snf.h" 98 #endif /* HAVE_SNF_API */ 99 100 #ifdef HAVE_TC_API 101 #include "pcap-tc.h" 102 #endif /* HAVE_TC_API */ 103 104 #ifdef PCAP_SUPPORT_USB 105 #include "pcap-usb-linux.h" 106 #endif 107 108 #ifdef PCAP_SUPPORT_BT 109 #include "pcap-bt-linux.h" 110 #endif 111 112 #ifdef PCAP_SUPPORT_BT_MONITOR 113 #include "pcap-bt-monitor-linux.h" 114 #endif 115 116 #ifdef PCAP_SUPPORT_NETFILTER 117 #include "pcap-netfilter-linux.h" 118 #endif 119 120 #ifdef PCAP_SUPPORT_NETMAP 121 #include "pcap-netmap.h" 122 #endif 123 124 #ifdef PCAP_SUPPORT_DBUS 125 #include "pcap-dbus.h" 126 #endif 127 128 #ifdef PCAP_SUPPORT_RPCAP 129 #include "pcap-rpcap-unix.h" 130 #endif 131 132 #ifdef PCAP_SUPPORT_RDMASNIFF 133 #include "pcap-rdmasniff.h" 134 #endif 135 136 #ifdef _WIN32 137 /* 138 * DllMain(), required when built as a Windows DLL. 139 */ 140 BOOL WINAPI DllMain( 141 HANDLE hinstDLL, 142 DWORD dwReason, 143 LPVOID lpvReserved 144 ) 145 { 146 return (TRUE); 147 } 148 149 /* 150 * Start WinSock. 151 * Exported in case some applications using WinPcap/Npcap called it, 152 * even though it wasn't exported. 153 */ 154 int 155 wsockinit(void) 156 { 157 WORD wVersionRequested; 158 WSADATA wsaData; 159 static int err = -1; 160 static int done = 0; 161 162 if (done) 163 return (err); 164 165 wVersionRequested = MAKEWORD( 1, 1); 166 err = WSAStartup( wVersionRequested, &wsaData ); 167 atexit ((void(*)(void))WSACleanup); 168 done = 1; 169 170 if ( err != 0 ) 171 err = -1; 172 return (err); 173 } 174 175 /* 176 * This is the exported function; new programs should call this. 177 */ 178 int 179 pcap_wsockinit(void) 180 { 181 return (wsockinit()); 182 } 183 #endif /* _WIN32 */ 184 185 /* 186 * String containing the library version. 187 * Not explicitly exported via a header file - the right API to use 188 * is pcap_lib_version() - but some programs included it, so we 189 * provide it. 190 * 191 * We declare it here, right before defining it, to squelch any 192 * warnings we might get from compilers about the lack of a 193 * declaration. 194 */ 195 PCAP_API char pcap_version[]; 196 PCAP_API_DEF char pcap_version[] = PACKAGE_VERSION; 197 198 static void 199 pcap_set_not_initialized_message(pcap_t *pcap) 200 { 201 if (pcap->activated) { 202 /* A module probably forgot to set the function pointer */ 203 (void)pcap_snprintf(pcap->errbuf, sizeof(pcap->errbuf), 204 "This operation isn't properly handled by that device"); 205 return; 206 } 207 /* in case the caller doesn't check for PCAP_ERROR_NOT_ACTIVATED */ 208 (void)pcap_snprintf(pcap->errbuf, sizeof(pcap->errbuf), 209 "This handle hasn't been activated yet"); 210 } 211 212 static int 213 pcap_read_not_initialized(pcap_t *pcap, int cnt _U_, pcap_handler callback _U_, 214 u_char *user _U_) 215 { 216 pcap_set_not_initialized_message(pcap); 217 /* this means 'not initialized' */ 218 return (PCAP_ERROR_NOT_ACTIVATED); 219 } 220 221 static int 222 pcap_inject_not_initialized(pcap_t *pcap, const void * buf _U_, size_t size _U_) 223 { 224 pcap_set_not_initialized_message(pcap); 225 /* this means 'not initialized' */ 226 return (PCAP_ERROR_NOT_ACTIVATED); 227 } 228 229 static int 230 pcap_setfilter_not_initialized(pcap_t *pcap, struct bpf_program *fp _U_) 231 { 232 pcap_set_not_initialized_message(pcap); 233 /* this means 'not initialized' */ 234 return (PCAP_ERROR_NOT_ACTIVATED); 235 } 236 237 static int 238 pcap_setdirection_not_initialized(pcap_t *pcap, pcap_direction_t d _U_) 239 { 240 pcap_set_not_initialized_message(pcap); 241 /* this means 'not initialized' */ 242 return (PCAP_ERROR_NOT_ACTIVATED); 243 } 244 245 static int 246 pcap_set_datalink_not_initialized(pcap_t *pcap, int dlt _U_) 247 { 248 pcap_set_not_initialized_message(pcap); 249 /* this means 'not initialized' */ 250 return (PCAP_ERROR_NOT_ACTIVATED); 251 } 252 253 static int 254 pcap_getnonblock_not_initialized(pcap_t *pcap) 255 { 256 pcap_set_not_initialized_message(pcap); 257 /* this means 'not initialized' */ 258 return (PCAP_ERROR_NOT_ACTIVATED); 259 } 260 261 static int 262 pcap_stats_not_initialized(pcap_t *pcap, struct pcap_stat *ps _U_) 263 { 264 pcap_set_not_initialized_message(pcap); 265 /* this means 'not initialized' */ 266 return (PCAP_ERROR_NOT_ACTIVATED); 267 } 268 269 #ifdef _WIN32 270 struct pcap_stat * 271 pcap_stats_ex_not_initialized(pcap_t *pcap, int *pcap_stat_size _U_) 272 { 273 pcap_set_not_initialized_message(pcap); 274 return (NULL); 275 } 276 277 static int 278 pcap_setbuff_not_initialized(pcap_t *pcap, int dim _U_) 279 { 280 pcap_set_not_initialized_message(pcap); 281 /* this means 'not initialized' */ 282 return (PCAP_ERROR_NOT_ACTIVATED); 283 } 284 285 static int 286 pcap_setmode_not_initialized(pcap_t *pcap, int mode _U_) 287 { 288 pcap_set_not_initialized_message(pcap); 289 /* this means 'not initialized' */ 290 return (PCAP_ERROR_NOT_ACTIVATED); 291 } 292 293 static int 294 pcap_setmintocopy_not_initialized(pcap_t *pcap, int size _U_) 295 { 296 pcap_set_not_initialized_message(pcap); 297 /* this means 'not initialized' */ 298 return (PCAP_ERROR_NOT_ACTIVATED); 299 } 300 301 static HANDLE 302 pcap_getevent_not_initialized(pcap_t *pcap) 303 { 304 pcap_set_not_initialized_message(pcap); 305 return (INVALID_HANDLE_VALUE); 306 } 307 308 static int 309 pcap_oid_get_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_, 310 void *data _U_, size_t *lenp _U_) 311 { 312 pcap_set_not_initialized_message(pcap); 313 return (PCAP_ERROR_NOT_ACTIVATED); 314 } 315 316 static int 317 pcap_oid_set_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_, 318 const void *data _U_, size_t *lenp _U_) 319 { 320 pcap_set_not_initialized_message(pcap); 321 return (PCAP_ERROR_NOT_ACTIVATED); 322 } 323 324 static u_int 325 pcap_sendqueue_transmit_not_initialized(pcap_t *pcap, pcap_send_queue* queue, int sync) 326 { 327 pcap_set_not_initialized_message(pcap); 328 return (0); 329 } 330 331 static int 332 pcap_setuserbuffer_not_initialized(pcap_t *pcap, int size _U_) 333 { 334 pcap_set_not_initialized_message(pcap); 335 return (PCAP_ERROR_NOT_ACTIVATED); 336 } 337 338 static int 339 pcap_live_dump_not_initialized(pcap_t *pcap, char *filename _U_, int maxsize _U_, 340 int maxpacks _U_) 341 { 342 pcap_set_not_initialized_message(pcap); 343 return (PCAP_ERROR_NOT_ACTIVATED); 344 } 345 346 static int 347 pcap_live_dump_ended_not_initialized(pcap_t *pcap, int sync _U_) 348 { 349 pcap_set_not_initialized_message(pcap); 350 return (PCAP_ERROR_NOT_ACTIVATED); 351 } 352 353 static PAirpcapHandle 354 pcap_get_airpcap_handle_not_initialized(pcap_t *pcap) 355 { 356 pcap_set_not_initialized_message(pcap); 357 return (NULL); 358 } 359 #endif 360 361 /* 362 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't, 363 * a PCAP_ERROR value on an error. 364 */ 365 int 366 pcap_can_set_rfmon(pcap_t *p) 367 { 368 return (p->can_set_rfmon_op(p)); 369 } 370 371 /* 372 * For systems where rfmon mode is never supported. 373 */ 374 static int 375 pcap_cant_set_rfmon(pcap_t *p _U_) 376 { 377 return (0); 378 } 379 380 /* 381 * Sets *tstamp_typesp to point to an array 1 or more supported time stamp 382 * types; the return value is the number of supported time stamp types. 383 * The list should be freed by a call to pcap_free_tstamp_types() when 384 * you're done with it. 385 * 386 * A return value of 0 means "you don't get a choice of time stamp type", 387 * in which case *tstamp_typesp is set to null. 388 * 389 * PCAP_ERROR is returned on error. 390 */ 391 int 392 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp) 393 { 394 if (p->tstamp_type_count == 0) { 395 /* 396 * We don't support multiple time stamp types. 397 * That means the only type we support is PCAP_TSTAMP_HOST; 398 * set up a list containing only that type. 399 */ 400 *tstamp_typesp = (int*)malloc(sizeof(**tstamp_typesp)); 401 if (*tstamp_typesp == NULL) { 402 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 403 errno, "malloc"); 404 return (PCAP_ERROR); 405 } 406 **tstamp_typesp = PCAP_TSTAMP_HOST; 407 return (1); 408 } else { 409 *tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp), 410 p->tstamp_type_count); 411 if (*tstamp_typesp == NULL) { 412 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 413 errno, "malloc"); 414 return (PCAP_ERROR); 415 } 416 (void)memcpy(*tstamp_typesp, p->tstamp_type_list, 417 sizeof(**tstamp_typesp) * p->tstamp_type_count); 418 return (p->tstamp_type_count); 419 } 420 } 421 422 /* 423 * In Windows, you might have a library built with one version of the 424 * C runtime library and an application built with another version of 425 * the C runtime library, which means that the library might use one 426 * version of malloc() and free() and the application might use another 427 * version of malloc() and free(). If so, that means something 428 * allocated by the library cannot be freed by the application, so we 429 * need to have a pcap_free_tstamp_types() routine to free up the list 430 * allocated by pcap_list_tstamp_types(), even though it's just a wrapper 431 * around free(). 432 */ 433 void 434 pcap_free_tstamp_types(int *tstamp_type_list) 435 { 436 free(tstamp_type_list); 437 } 438 439 /* 440 * Default one-shot callback; overridden for capture types where the 441 * packet data cannot be guaranteed to be available after the callback 442 * returns, so that a copy must be made. 443 */ 444 void 445 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt) 446 { 447 struct oneshot_userdata *sp = (struct oneshot_userdata *)user; 448 449 *sp->hdr = *h; 450 *sp->pkt = pkt; 451 } 452 453 const u_char * 454 pcap_next(pcap_t *p, struct pcap_pkthdr *h) 455 { 456 struct oneshot_userdata s; 457 const u_char *pkt; 458 459 s.hdr = h; 460 s.pkt = &pkt; 461 s.pd = p; 462 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0) 463 return (0); 464 return (pkt); 465 } 466 467 int 468 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, 469 const u_char **pkt_data) 470 { 471 struct oneshot_userdata s; 472 473 s.hdr = &p->pcap_header; 474 s.pkt = pkt_data; 475 s.pd = p; 476 477 /* Saves a pointer to the packet headers */ 478 *pkt_header= &p->pcap_header; 479 480 if (p->rfile != NULL) { 481 int status; 482 483 /* We are on an offline capture */ 484 status = pcap_offline_read(p, 1, p->oneshot_callback, 485 (u_char *)&s); 486 487 /* 488 * Return codes for pcap_offline_read() are: 489 * - 0: EOF 490 * - -1: error 491 * - >1: OK 492 * The first one ('0') conflicts with the return code of 493 * 0 from pcap_read() meaning "no packets arrived before 494 * the timeout expired", so we map it to -2 so you can 495 * distinguish between an EOF from a savefile and a 496 * "no packets arrived before the timeout expired, try 497 * again" from a live capture. 498 */ 499 if (status == 0) 500 return (-2); 501 else 502 return (status); 503 } 504 505 /* 506 * Return codes for pcap_read() are: 507 * - 0: timeout 508 * - -1: error 509 * - -2: loop was broken out of with pcap_breakloop() 510 * - >1: OK 511 * The first one ('0') conflicts with the return code of 0 from 512 * pcap_offline_read() meaning "end of file". 513 */ 514 return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s)); 515 } 516 517 /* 518 * Implementation of a pcap_if_list_t. 519 */ 520 struct pcap_if_list { 521 pcap_if_t *beginning; 522 }; 523 524 static struct capture_source_type { 525 int (*findalldevs_op)(pcap_if_list_t *, char *); 526 pcap_t *(*create_op)(const char *, char *, int *); 527 } capture_source_types[] = { 528 #ifdef HAVE_DAG_API 529 { dag_findalldevs, dag_create }, 530 #endif 531 #ifdef HAVE_SEPTEL_API 532 { septel_findalldevs, septel_create }, 533 #endif 534 #ifdef HAVE_SNF_API 535 { snf_findalldevs, snf_create }, 536 #endif 537 #ifdef HAVE_TC_API 538 { TcFindAllDevs, TcCreate }, 539 #endif 540 #ifdef PCAP_SUPPORT_BT 541 { bt_findalldevs, bt_create }, 542 #endif 543 #ifdef PCAP_SUPPORT_BT_MONITOR 544 { bt_monitor_findalldevs, bt_monitor_create }, 545 #endif 546 #ifdef PCAP_SUPPORT_USB 547 { usb_findalldevs, usb_create }, 548 #endif 549 #ifdef PCAP_SUPPORT_NETFILTER 550 { netfilter_findalldevs, netfilter_create }, 551 #endif 552 #ifdef PCAP_SUPPORT_NETMAP 553 { pcap_netmap_findalldevs, pcap_netmap_create }, 554 #endif 555 #ifdef PCAP_SUPPORT_DBUS 556 { dbus_findalldevs, dbus_create }, 557 #endif 558 #ifdef PCAP_SUPPORT_RDMASNIFF 559 { rdmasniff_findalldevs, rdmasniff_create }, 560 #endif 561 #ifdef PCAP_SUPPORT_RPCAP 562 { NULL, rpcap_create }, 563 #endif 564 { NULL, NULL } 565 }; 566 567 /* 568 * Get a list of all capture sources that are up and that we can open. 569 * Returns -1 on error, 0 otherwise. 570 * The list, as returned through "alldevsp", may be null if no interfaces 571 * were up and could be opened. 572 */ 573 int 574 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) 575 { 576 size_t i; 577 pcap_if_list_t devlist; 578 579 /* 580 * Find all the local network interfaces on which we 581 * can capture. 582 */ 583 devlist.beginning = NULL; 584 if (pcap_platform_finddevs(&devlist, errbuf) == -1) { 585 /* 586 * Failed - free all of the entries we were given 587 * before we failed. 588 */ 589 if (devlist.beginning != NULL) 590 pcap_freealldevs(devlist.beginning); 591 *alldevsp = NULL; 592 return (-1); 593 } 594 595 /* 596 * Ask each of the non-local-network-interface capture 597 * source types what interfaces they have. 598 */ 599 for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) { 600 if (capture_source_types[i].findalldevs_op(&devlist, errbuf) == -1) { 601 /* 602 * We had an error; free the list we've been 603 * constructing. 604 */ 605 if (devlist.beginning != NULL) 606 pcap_freealldevs(devlist.beginning); 607 *alldevsp = NULL; 608 return (-1); 609 } 610 } 611 612 /* 613 * Return the first entry of the list of all devices. 614 */ 615 *alldevsp = devlist.beginning; 616 return (0); 617 } 618 619 static struct sockaddr * 620 dup_sockaddr(struct sockaddr *sa, size_t sa_length) 621 { 622 struct sockaddr *newsa; 623 624 if ((newsa = malloc(sa_length)) == NULL) 625 return (NULL); 626 return (memcpy(newsa, sa, sa_length)); 627 } 628 629 /* 630 * Construct a "figure of merit" for an interface, for use when sorting 631 * the list of interfaces, in which interfaces that are up are superior 632 * to interfaces that aren't up, interfaces that are up and running are 633 * superior to interfaces that are up but not running, and non-loopback 634 * interfaces that are up and running are superior to loopback interfaces, 635 * and interfaces with the same flags have a figure of merit that's higher 636 * the lower the instance number. 637 * 638 * The goal is to try to put the interfaces most likely to be useful for 639 * capture at the beginning of the list. 640 * 641 * The figure of merit, which is lower the "better" the interface is, 642 * has the uppermost bit set if the interface isn't running, the bit 643 * below that set if the interface isn't up, the bit below that set 644 * if the interface is a loopback interface, and the interface index 645 * in the 29 bits below that. (Yes, we assume u_int is 32 bits.) 646 */ 647 static u_int 648 get_figure_of_merit(pcap_if_t *dev) 649 { 650 const char *cp; 651 u_int n; 652 653 if (strcmp(dev->name, "any") == 0) { 654 /* 655 * Give the "any" device an artificially high instance 656 * number, so it shows up after all other non-loopback 657 * interfaces. 658 */ 659 n = 0x1FFFFFFF; /* 29 all-1 bits */ 660 } else { 661 /* 662 * A number at the end of the device name string is 663 * assumed to be an instance number. Add 1 to the 664 * instance number, and use 0 for "no instance 665 * number", so we don't put "no instance number" 666 * devices and "instance 0" devices together. 667 */ 668 cp = dev->name + strlen(dev->name) - 1; 669 while (cp-1 >= dev->name && *(cp-1) >= '0' && *(cp-1) <= '9') 670 cp--; 671 if (*cp >= '0' && *cp <= '9') 672 n = atoi(cp) + 1; 673 else 674 n = 0; 675 } 676 if (!(dev->flags & PCAP_IF_RUNNING)) 677 n |= 0x80000000; 678 if (!(dev->flags & PCAP_IF_UP)) 679 n |= 0x40000000; 680 681 /* 682 * Give non-wireless interfaces that aren't disconnected a better 683 * figure of merit than interfaces that are disconnected, as 684 * "disconnected" should indicate that the interface isn't 685 * plugged into a network and thus won't give you any traffic. 686 * 687 * For wireless interfaces, it means "associated with a network", 688 * which we presume not to necessarily prevent capture, as you 689 * might run the adapter in some flavor of monitor mode. 690 */ 691 if (!(dev->flags & PCAP_IF_WIRELESS) && 692 (dev->flags & PCAP_IF_CONNECTION_STATUS) == PCAP_IF_CONNECTION_STATUS_DISCONNECTED) 693 n |= 0x20000000; 694 695 /* 696 * Sort loopback devices after non-loopback devices, *except* for 697 * disconnected devices. 698 */ 699 if (dev->flags & PCAP_IF_LOOPBACK) 700 n |= 0x10000000; 701 702 return (n); 703 } 704 705 #ifndef _WIN32 706 /* 707 * Try to get a description for a given device. 708 * Returns a mallocated description if it could and NULL if it couldn't. 709 * 710 * XXX - on FreeBSDs that support it, should it get the sysctl named 711 * "dev.{adapter family name}.{adapter unit}.%desc" to get a description 712 * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800" 713 * with my Cisco 350 card, so the name isn't entirely descriptive. The 714 * "dev.an.0.%pnpinfo" has a better description, although one might argue 715 * that the problem is really a driver bug - if it can find out that it's 716 * a Cisco 340 or 350, rather than an old Aironet card, it should use 717 * that in the description. 718 * 719 * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD 720 * and OpenBSD let you get a description, but it's not generated by the OS, 721 * it's set with another ioctl that ifconfig supports; we use that to get 722 * a description in FreeBSD and OpenBSD, but if there is no such 723 * description available, it still might be nice to get some description 724 * string based on the device type or something such as that. 725 * 726 * In macOS, the System Configuration framework can apparently return 727 * names in 10.4 and later. 728 * 729 * It also appears that freedesktop.org's HAL offers an "info.product" 730 * string, but the HAL specification says it "should not be used in any 731 * UI" and "subsystem/capability specific properties" should be used 732 * instead and, in any case, I think HAL is being deprecated in 733 * favor of other stuff such as DeviceKit. DeviceKit doesn't appear 734 * to have any obvious product information for devices, but maybe 735 * I haven't looked hard enough. 736 * 737 * Using the System Configuration framework, or HAL, or DeviceKit, or 738 * whatever, would require that libpcap applications be linked with 739 * the frameworks/libraries in question. That shouldn't be a problem 740 * for programs linking with the shared version of libpcap (unless 741 * you're running on AIX - which I think is the only UN*X that doesn't 742 * support linking a shared library with other libraries on which it 743 * depends, and having an executable linked only with the first shared 744 * library automatically pick up the other libraries when started - 745 * and using HAL or whatever). Programs linked with the static 746 * version of libpcap would have to use pcap-config with the --static 747 * flag in order to get the right linker flags in order to pick up 748 * the additional libraries/frameworks; those programs need that anyway 749 * for libpcap 1.1 and beyond on Linux, as, by default, it requires 750 * -lnl. 751 * 752 * Do any other UN*Xes, or desktop environments support getting a 753 * description? 754 */ 755 static char * 756 #ifdef SIOCGIFDESCR 757 get_if_description(const char *name) 758 { 759 char *description = NULL; 760 int s; 761 struct ifreq ifrdesc; 762 #ifndef IFDESCRSIZE 763 size_t descrlen = 64; 764 #else 765 size_t descrlen = IFDESCRSIZE; 766 #endif /* IFDESCRSIZE */ 767 768 /* 769 * Get the description for the interface. 770 */ 771 memset(&ifrdesc, 0, sizeof ifrdesc); 772 pcap_strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name); 773 s = socket(AF_INET, SOCK_DGRAM, 0); 774 if (s >= 0) { 775 #ifdef __FreeBSD__ 776 /* 777 * On FreeBSD, if the buffer isn't big enough for the 778 * description, the ioctl succeeds, but the description 779 * isn't copied, ifr_buffer.length is set to the description 780 * length, and ifr_buffer.buffer is set to NULL. 781 */ 782 for (;;) { 783 free(description); 784 if ((description = malloc(descrlen)) != NULL) { 785 ifrdesc.ifr_buffer.buffer = description; 786 ifrdesc.ifr_buffer.length = descrlen; 787 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) { 788 if (ifrdesc.ifr_buffer.buffer == 789 description) 790 break; 791 else 792 descrlen = ifrdesc.ifr_buffer.length; 793 } else { 794 /* 795 * Failed to get interface description. 796 */ 797 free(description); 798 description = NULL; 799 break; 800 } 801 } else 802 break; 803 } 804 #else /* __FreeBSD__ */ 805 /* 806 * The only other OS that currently supports 807 * SIOCGIFDESCR is OpenBSD, and it has no way 808 * to get the description length - it's clamped 809 * to a maximum of IFDESCRSIZE. 810 */ 811 if ((description = malloc(descrlen)) != NULL) { 812 ifrdesc.ifr_data = (caddr_t)description; 813 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) { 814 /* 815 * Failed to get interface description. 816 */ 817 free(description); 818 description = NULL; 819 } 820 } 821 #endif /* __FreeBSD__ */ 822 close(s); 823 if (description != NULL && description[0] == '\0') { 824 /* 825 * Description is empty, so discard it. 826 */ 827 free(description); 828 description = NULL; 829 } 830 } 831 832 #ifdef __FreeBSD__ 833 /* 834 * For FreeBSD, if we didn't get a description, and this is 835 * a device with a name of the form usbusN, label it as a USB 836 * bus. 837 */ 838 if (description == NULL) { 839 if (strncmp(name, "usbus", 5) == 0) { 840 /* 841 * OK, it begins with "usbus". 842 */ 843 long busnum; 844 char *p; 845 846 errno = 0; 847 busnum = strtol(name + 5, &p, 10); 848 if (errno == 0 && p != name + 5 && *p == '\0' && 849 busnum >= 0 && busnum <= INT_MAX) { 850 /* 851 * OK, it's a valid number that's not 852 * bigger than INT_MAX. Construct 853 * a description from it. 854 * (If that fails, we don't worry about 855 * it, we just return NULL.) 856 */ 857 if (pcap_asprintf(&description, 858 "USB bus number %ld", busnum) == -1) { 859 /* Failed. */ 860 description = NULL; 861 } 862 } 863 } 864 } 865 #endif 866 return (description); 867 #else /* SIOCGIFDESCR */ 868 get_if_description(const char *name _U_) 869 { 870 return (NULL); 871 #endif /* SIOCGIFDESCR */ 872 } 873 874 /* 875 * Look for a given device in the specified list of devices. 876 * 877 * If we find it, return a pointer to its entry. 878 * 879 * If we don't find it, attempt to add an entry for it, with the specified 880 * IFF_ flags and description, and, if that succeeds, return a pointer to 881 * the new entry, otherwise return NULL and set errbuf to an error message. 882 */ 883 pcap_if_t * 884 find_or_add_if(pcap_if_list_t *devlistp, const char *name, 885 bpf_u_int32 if_flags, get_if_flags_func get_flags_func, char *errbuf) 886 { 887 bpf_u_int32 pcap_flags; 888 889 /* 890 * Convert IFF_ flags to pcap flags. 891 */ 892 pcap_flags = 0; 893 #ifdef IFF_LOOPBACK 894 if (if_flags & IFF_LOOPBACK) 895 pcap_flags |= PCAP_IF_LOOPBACK; 896 #else 897 /* 898 * We don't have IFF_LOOPBACK, so look at the device name to 899 * see if it looks like a loopback device. 900 */ 901 if (name[0] == 'l' && name[1] == 'o' && 902 (isdigit((unsigned char)(name[2])) || name[2] == '\0') 903 pcap_flags |= PCAP_IF_LOOPBACK; 904 #endif 905 #ifdef IFF_UP 906 if (if_flags & IFF_UP) 907 pcap_flags |= PCAP_IF_UP; 908 #endif 909 #ifdef IFF_RUNNING 910 if (if_flags & IFF_RUNNING) 911 pcap_flags |= PCAP_IF_RUNNING; 912 #endif 913 914 /* 915 * Attempt to find an entry for this device; if we don't find one, 916 * attempt to add one. 917 */ 918 return (find_or_add_dev(devlistp, name, pcap_flags, 919 get_flags_func, get_if_description(name), errbuf)); 920 } 921 922 /* 923 * Look for a given device in the specified list of devices. 924 * 925 * If we find it, then, if the specified address isn't null, add it to 926 * the list of addresses for the device and return 0. 927 * 928 * If we don't find it, attempt to add an entry for it, with the specified 929 * IFF_ flags and description, and, if that succeeds, add the specified 930 * address to its list of addresses if that address is non-null, and 931 * return 0, otherwise return -1 and set errbuf to an error message. 932 * 933 * (We can get called with a null address because we might get a list 934 * of interface name/address combinations from the underlying OS, with 935 * the address being absent in some cases, rather than a list of 936 * interfaces with each interface having a list of addresses, so this 937 * call may be the only call made to add to the list, and we want to 938 * add interfaces even if they have no addresses.) 939 */ 940 int 941 add_addr_to_if(pcap_if_list_t *devlistp, const char *name, 942 bpf_u_int32 if_flags, get_if_flags_func get_flags_func, 943 struct sockaddr *addr, size_t addr_size, 944 struct sockaddr *netmask, size_t netmask_size, 945 struct sockaddr *broadaddr, size_t broadaddr_size, 946 struct sockaddr *dstaddr, size_t dstaddr_size, 947 char *errbuf) 948 { 949 pcap_if_t *curdev; 950 951 /* 952 * Check whether the device exists and, if not, add it. 953 */ 954 curdev = find_or_add_if(devlistp, name, if_flags, get_flags_func, 955 errbuf); 956 if (curdev == NULL) { 957 /* 958 * Error - give up. 959 */ 960 return (-1); 961 } 962 963 if (addr == NULL) { 964 /* 965 * There's no address to add; this entry just meant 966 * "here's a new interface". 967 */ 968 return (0); 969 } 970 971 /* 972 * "curdev" is an entry for this interface, and we have an 973 * address for it; add an entry for that address to the 974 * interface's list of addresses. 975 */ 976 return (add_addr_to_dev(curdev, addr, addr_size, netmask, 977 netmask_size, broadaddr, broadaddr_size, dstaddr, 978 dstaddr_size, errbuf)); 979 } 980 #endif /* _WIN32 */ 981 982 /* 983 * Add an entry to the list of addresses for an interface. 984 * "curdev" is the entry for that interface. 985 */ 986 int 987 add_addr_to_dev(pcap_if_t *curdev, 988 struct sockaddr *addr, size_t addr_size, 989 struct sockaddr *netmask, size_t netmask_size, 990 struct sockaddr *broadaddr, size_t broadaddr_size, 991 struct sockaddr *dstaddr, size_t dstaddr_size, 992 char *errbuf) 993 { 994 pcap_addr_t *curaddr, *prevaddr, *nextaddr; 995 996 /* 997 * Allocate the new entry and fill it in. 998 */ 999 curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t)); 1000 if (curaddr == NULL) { 1001 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1002 errno, "malloc"); 1003 return (-1); 1004 } 1005 1006 curaddr->next = NULL; 1007 if (addr != NULL && addr_size != 0) { 1008 curaddr->addr = (struct sockaddr *)dup_sockaddr(addr, addr_size); 1009 if (curaddr->addr == NULL) { 1010 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1011 errno, "malloc"); 1012 free(curaddr); 1013 return (-1); 1014 } 1015 } else 1016 curaddr->addr = NULL; 1017 1018 if (netmask != NULL && netmask_size != 0) { 1019 curaddr->netmask = (struct sockaddr *)dup_sockaddr(netmask, netmask_size); 1020 if (curaddr->netmask == NULL) { 1021 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1022 errno, "malloc"); 1023 if (curaddr->addr != NULL) 1024 free(curaddr->addr); 1025 free(curaddr); 1026 return (-1); 1027 } 1028 } else 1029 curaddr->netmask = NULL; 1030 1031 if (broadaddr != NULL && broadaddr_size != 0) { 1032 curaddr->broadaddr = (struct sockaddr *)dup_sockaddr(broadaddr, broadaddr_size); 1033 if (curaddr->broadaddr == NULL) { 1034 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1035 errno, "malloc"); 1036 if (curaddr->netmask != NULL) 1037 free(curaddr->netmask); 1038 if (curaddr->addr != NULL) 1039 free(curaddr->addr); 1040 free(curaddr); 1041 return (-1); 1042 } 1043 } else 1044 curaddr->broadaddr = NULL; 1045 1046 if (dstaddr != NULL && dstaddr_size != 0) { 1047 curaddr->dstaddr = (struct sockaddr *)dup_sockaddr(dstaddr, dstaddr_size); 1048 if (curaddr->dstaddr == NULL) { 1049 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1050 errno, "malloc"); 1051 if (curaddr->broadaddr != NULL) 1052 free(curaddr->broadaddr); 1053 if (curaddr->netmask != NULL) 1054 free(curaddr->netmask); 1055 if (curaddr->addr != NULL) 1056 free(curaddr->addr); 1057 free(curaddr); 1058 return (-1); 1059 } 1060 } else 1061 curaddr->dstaddr = NULL; 1062 1063 /* 1064 * Find the end of the list of addresses. 1065 */ 1066 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) { 1067 nextaddr = prevaddr->next; 1068 if (nextaddr == NULL) { 1069 /* 1070 * This is the end of the list. 1071 */ 1072 break; 1073 } 1074 } 1075 1076 if (prevaddr == NULL) { 1077 /* 1078 * The list was empty; this is the first member. 1079 */ 1080 curdev->addresses = curaddr; 1081 } else { 1082 /* 1083 * "prevaddr" is the last member of the list; append 1084 * this member to it. 1085 */ 1086 prevaddr->next = curaddr; 1087 } 1088 1089 return (0); 1090 } 1091 1092 /* 1093 * Look for a given device in the specified list of devices. 1094 * 1095 * If we find it, return 0 and set *curdev_ret to point to it. 1096 * 1097 * If we don't find it, attempt to add an entry for it, with the specified 1098 * flags and description, and, if that succeeds, return 0, otherwise 1099 * return -1 and set errbuf to an error message. 1100 */ 1101 pcap_if_t * 1102 find_or_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags, 1103 get_if_flags_func get_flags_func, const char *description, char *errbuf) 1104 { 1105 pcap_if_t *curdev; 1106 1107 /* 1108 * Is there already an entry in the list for this device? 1109 */ 1110 curdev = find_dev(devlistp, name); 1111 if (curdev != NULL) { 1112 /* 1113 * Yes, return it. 1114 */ 1115 return (curdev); 1116 } 1117 1118 /* 1119 * No, we didn't find it. 1120 */ 1121 1122 /* 1123 * Try to get additional flags for the device. 1124 */ 1125 if ((*get_flags_func)(name, &flags, errbuf) == -1) { 1126 /* 1127 * Failed. 1128 */ 1129 return (NULL); 1130 } 1131 1132 /* 1133 * Now, try to add it to the list of devices. 1134 */ 1135 return (add_dev(devlistp, name, flags, description, errbuf)); 1136 } 1137 1138 /* 1139 * Look for a given device in the specified list of devices, and return 1140 * the entry for it if we find it or NULL if we don't. 1141 */ 1142 pcap_if_t * 1143 find_dev(pcap_if_list_t *devlistp, const char *name) 1144 { 1145 pcap_if_t *curdev; 1146 1147 /* 1148 * Is there an entry in the list for this device? 1149 */ 1150 for (curdev = devlistp->beginning; curdev != NULL; 1151 curdev = curdev->next) { 1152 if (strcmp(name, curdev->name) == 0) { 1153 /* 1154 * We found it, so, yes, there is. No need to 1155 * add it. Provide the entry we found to our 1156 * caller. 1157 */ 1158 return (curdev); 1159 } 1160 } 1161 1162 /* 1163 * No. 1164 */ 1165 return (NULL); 1166 } 1167 1168 /* 1169 * Attempt to add an entry for a device, with the specified flags 1170 * and description, and, if that succeeds, return 0 and return a pointer 1171 * to the new entry, otherwise return NULL and set errbuf to an error 1172 * message. 1173 * 1174 * If we weren't given a description, try to get one. 1175 */ 1176 pcap_if_t * 1177 add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags, 1178 const char *description, char *errbuf) 1179 { 1180 pcap_if_t *curdev, *prevdev, *nextdev; 1181 u_int this_figure_of_merit, nextdev_figure_of_merit; 1182 1183 curdev = malloc(sizeof(pcap_if_t)); 1184 if (curdev == NULL) { 1185 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1186 errno, "malloc"); 1187 return (NULL); 1188 } 1189 1190 /* 1191 * Fill in the entry. 1192 */ 1193 curdev->next = NULL; 1194 curdev->name = strdup(name); 1195 if (curdev->name == NULL) { 1196 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1197 errno, "malloc"); 1198 free(curdev); 1199 return (NULL); 1200 } 1201 if (description == NULL) { 1202 /* 1203 * We weren't handed a description for the interface. 1204 */ 1205 curdev->description = NULL; 1206 } else { 1207 /* 1208 * We were handed a description; make a copy. 1209 */ 1210 curdev->description = strdup(description); 1211 if (curdev->description == NULL) { 1212 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1213 errno, "malloc"); 1214 free(curdev->name); 1215 free(curdev); 1216 return (NULL); 1217 } 1218 } 1219 curdev->addresses = NULL; /* list starts out as empty */ 1220 curdev->flags = flags; 1221 1222 /* 1223 * Add it to the list, in the appropriate location. 1224 * First, get the "figure of merit" for this interface. 1225 */ 1226 this_figure_of_merit = get_figure_of_merit(curdev); 1227 1228 /* 1229 * Now look for the last interface with an figure of merit 1230 * less than or equal to the new interface's figure of merit. 1231 * 1232 * We start with "prevdev" being NULL, meaning we're before 1233 * the first element in the list. 1234 */ 1235 prevdev = NULL; 1236 for (;;) { 1237 /* 1238 * Get the interface after this one. 1239 */ 1240 if (prevdev == NULL) { 1241 /* 1242 * The next element is the first element. 1243 */ 1244 nextdev = devlistp->beginning; 1245 } else 1246 nextdev = prevdev->next; 1247 1248 /* 1249 * Are we at the end of the list? 1250 */ 1251 if (nextdev == NULL) { 1252 /* 1253 * Yes - we have to put the new entry after "prevdev". 1254 */ 1255 break; 1256 } 1257 1258 /* 1259 * Is the new interface's figure of merit less 1260 * than the next interface's figure of merit, 1261 * meaning that the new interface is better 1262 * than the next interface? 1263 */ 1264 nextdev_figure_of_merit = get_figure_of_merit(nextdev); 1265 if (this_figure_of_merit < nextdev_figure_of_merit) { 1266 /* 1267 * Yes - we should put the new entry 1268 * before "nextdev", i.e. after "prevdev". 1269 */ 1270 break; 1271 } 1272 1273 prevdev = nextdev; 1274 } 1275 1276 /* 1277 * Insert before "nextdev". 1278 */ 1279 curdev->next = nextdev; 1280 1281 /* 1282 * Insert after "prevdev" - unless "prevdev" is null, 1283 * in which case this is the first interface. 1284 */ 1285 if (prevdev == NULL) { 1286 /* 1287 * This is the first interface. Make it 1288 * the first element in the list of devices. 1289 */ 1290 devlistp->beginning = curdev; 1291 } else 1292 prevdev->next = curdev; 1293 return (curdev); 1294 } 1295 1296 /* 1297 * Free a list of interfaces. 1298 */ 1299 void 1300 pcap_freealldevs(pcap_if_t *alldevs) 1301 { 1302 pcap_if_t *curdev, *nextdev; 1303 pcap_addr_t *curaddr, *nextaddr; 1304 1305 for (curdev = alldevs; curdev != NULL; curdev = nextdev) { 1306 nextdev = curdev->next; 1307 1308 /* 1309 * Free all addresses. 1310 */ 1311 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) { 1312 nextaddr = curaddr->next; 1313 if (curaddr->addr) 1314 free(curaddr->addr); 1315 if (curaddr->netmask) 1316 free(curaddr->netmask); 1317 if (curaddr->broadaddr) 1318 free(curaddr->broadaddr); 1319 if (curaddr->dstaddr) 1320 free(curaddr->dstaddr); 1321 free(curaddr); 1322 } 1323 1324 /* 1325 * Free the name string. 1326 */ 1327 free(curdev->name); 1328 1329 /* 1330 * Free the description string, if any. 1331 */ 1332 if (curdev->description != NULL) 1333 free(curdev->description); 1334 1335 /* 1336 * Free the interface. 1337 */ 1338 free(curdev); 1339 } 1340 } 1341 1342 /* 1343 * pcap-npf.c has its own pcap_lookupdev(), for compatibility reasons, as 1344 * it actually returns the names of all interfaces, with a NUL separator 1345 * between them; some callers may depend on that. 1346 * 1347 * MS-DOS has its own pcap_lookupdev(), but that might be useful only 1348 * as an optimization. 1349 * 1350 * In all other cases, we just use pcap_findalldevs() to get a list of 1351 * devices, and pick from that list. 1352 */ 1353 #if !defined(HAVE_PACKET32) && !defined(MSDOS) 1354 /* 1355 * Return the name of a network interface attached to the system, or NULL 1356 * if none can be found. The interface must be configured up; the 1357 * lowest unit number is preferred; loopback is ignored. 1358 */ 1359 char * 1360 pcap_lookupdev(char *errbuf) 1361 { 1362 pcap_if_t *alldevs; 1363 #ifdef _WIN32 1364 /* 1365 * Windows - use the same size as the old WinPcap 3.1 code. 1366 * XXX - this is probably bigger than it needs to be. 1367 */ 1368 #define IF_NAMESIZE 8192 1369 #else 1370 /* 1371 * UN*X - use the system's interface name size. 1372 * XXX - that might not be large enough for capture devices 1373 * that aren't regular network interfaces. 1374 */ 1375 /* for old BSD systems, including bsdi3 */ 1376 #ifndef IF_NAMESIZE 1377 #define IF_NAMESIZE IFNAMSIZ 1378 #endif 1379 #endif 1380 static char device[IF_NAMESIZE + 1]; 1381 char *ret; 1382 1383 if (pcap_findalldevs(&alldevs, errbuf) == -1) 1384 return (NULL); 1385 1386 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) { 1387 /* 1388 * There are no devices on the list, or the first device 1389 * on the list is a loopback device, which means there 1390 * are no non-loopback devices on the list. This means 1391 * we can't return any device. 1392 * 1393 * XXX - why not return a loopback device? If we can't 1394 * capture on it, it won't be on the list, and if it's 1395 * on the list, there aren't any non-loopback devices, 1396 * so why not just supply it as the default device? 1397 */ 1398 (void)pcap_strlcpy(errbuf, "no suitable device found", 1399 PCAP_ERRBUF_SIZE); 1400 ret = NULL; 1401 } else { 1402 /* 1403 * Return the name of the first device on the list. 1404 */ 1405 (void)pcap_strlcpy(device, alldevs->name, sizeof(device)); 1406 ret = device; 1407 } 1408 1409 pcap_freealldevs(alldevs); 1410 return (ret); 1411 } 1412 #endif /* !defined(HAVE_PACKET32) && !defined(MSDOS) */ 1413 1414 #if !defined(_WIN32) && !defined(MSDOS) 1415 /* 1416 * We don't just fetch the entire list of devices, search for the 1417 * particular device, and use its first IPv4 address, as that's too 1418 * much work to get just one device's netmask. 1419 * 1420 * If we had an API to get attributes for a given device, we could 1421 * use that. 1422 */ 1423 int 1424 pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp, 1425 char *errbuf) 1426 { 1427 register int fd; 1428 register struct sockaddr_in *sin4; 1429 struct ifreq ifr; 1430 1431 /* 1432 * The pseudo-device "any" listens on all interfaces and therefore 1433 * has the network address and -mask "0.0.0.0" therefore catching 1434 * all traffic. Using NULL for the interface is the same as "any". 1435 */ 1436 if (!device || strcmp(device, "any") == 0 1437 #ifdef HAVE_DAG_API 1438 || strstr(device, "dag") != NULL 1439 #endif 1440 #ifdef HAVE_SEPTEL_API 1441 || strstr(device, "septel") != NULL 1442 #endif 1443 #ifdef PCAP_SUPPORT_BT 1444 || strstr(device, "bluetooth") != NULL 1445 #endif 1446 #ifdef PCAP_SUPPORT_USB 1447 || strstr(device, "usbmon") != NULL 1448 #endif 1449 #ifdef HAVE_SNF_API 1450 || strstr(device, "snf") != NULL 1451 #endif 1452 #ifdef PCAP_SUPPORT_NETMAP 1453 || strncmp(device, "netmap:", 7) == 0 1454 || strncmp(device, "vale", 4) == 0 1455 #endif 1456 ) { 1457 *netp = *maskp = 0; 1458 return 0; 1459 } 1460 1461 fd = socket(AF_INET, SOCK_DGRAM, 0); 1462 if (fd < 0) { 1463 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1464 errno, "socket"); 1465 return (-1); 1466 } 1467 memset(&ifr, 0, sizeof(ifr)); 1468 #ifdef linux 1469 /* XXX Work around Linux kernel bug */ 1470 ifr.ifr_addr.sa_family = AF_INET; 1471 #endif 1472 (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 1473 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { 1474 if (errno == EADDRNOTAVAIL) { 1475 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1476 "%s: no IPv4 address assigned", device); 1477 } else { 1478 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1479 errno, "SIOCGIFADDR: %s", device); 1480 } 1481 (void)close(fd); 1482 return (-1); 1483 } 1484 sin4 = (struct sockaddr_in *)&ifr.ifr_addr; 1485 *netp = sin4->sin_addr.s_addr; 1486 memset(&ifr, 0, sizeof(ifr)); 1487 #ifdef linux 1488 /* XXX Work around Linux kernel bug */ 1489 ifr.ifr_addr.sa_family = AF_INET; 1490 #endif 1491 (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 1492 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) { 1493 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1494 errno, "SIOCGIFNETMASK: %s", device); 1495 (void)close(fd); 1496 return (-1); 1497 } 1498 (void)close(fd); 1499 *maskp = sin4->sin_addr.s_addr; 1500 if (*maskp == 0) { 1501 if (IN_CLASSA(*netp)) 1502 *maskp = IN_CLASSA_NET; 1503 else if (IN_CLASSB(*netp)) 1504 *maskp = IN_CLASSB_NET; 1505 else if (IN_CLASSC(*netp)) 1506 *maskp = IN_CLASSC_NET; 1507 else { 1508 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1509 "inet class for 0x%x unknown", *netp); 1510 return (-1); 1511 } 1512 } 1513 *netp &= *maskp; 1514 return (0); 1515 } 1516 #endif /* !defined(_WIN32) && !defined(MSDOS) */ 1517 1518 #ifdef ENABLE_REMOTE 1519 #include "pcap-rpcap.h" 1520 1521 /* 1522 * Extract a substring from a string. 1523 */ 1524 static char * 1525 get_substring(const char *p, size_t len, char *ebuf) 1526 { 1527 char *token; 1528 1529 token = malloc(len + 1); 1530 if (token == NULL) { 1531 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1532 errno, "malloc"); 1533 return (NULL); 1534 } 1535 memcpy(token, p, len); 1536 token[len] = '\0'; 1537 return (token); 1538 } 1539 1540 /* 1541 * Parse a capture source that might be a URL. 1542 * 1543 * If the source is not a URL, *schemep, *userinfop, *hostp, and *portp 1544 * are set to NULL, *pathp is set to point to the source, and 0 is 1545 * returned. 1546 * 1547 * If source is a URL, and the URL refers to a local device (a special 1548 * case of rpcap:), *schemep, *userinfop, *hostp, and *portp are set 1549 * to NULL, *pathp is set to point to the device name, and 0 is returned. 1550 * 1551 * If source is a URL, and it's not a special case that refers to a local 1552 * device, and the parse succeeds: 1553 * 1554 * *schemep is set to point to an allocated string containing the scheme; 1555 * 1556 * if user information is present in the URL, *userinfop is set to point 1557 * to an allocated string containing the user information, otherwise 1558 * it's set to NULL; 1559 * 1560 * if host information is present in the URL, *hostp is set to point 1561 * to an allocated string containing the host information, otherwise 1562 * it's set to NULL; 1563 * 1564 * if a port number is present in the URL, *portp is set to point 1565 * to an allocated string containing the port number, otherwise 1566 * it's set to NULL; 1567 * 1568 * *pathp is set to point to an allocated string containing the 1569 * path; 1570 * 1571 * and 0 is returned. 1572 * 1573 * If the parse fails, ebuf is set to an error string, and -1 is returned. 1574 */ 1575 static int 1576 pcap_parse_source(const char *source, char **schemep, char **userinfop, 1577 char **hostp, char **portp, char **pathp, char *ebuf) 1578 { 1579 char *colonp; 1580 size_t scheme_len; 1581 char *scheme; 1582 const char *endp; 1583 size_t authority_len; 1584 char *authority; 1585 char *parsep, *atsignp, *bracketp; 1586 char *userinfo, *host, *port, *path; 1587 1588 /* 1589 * Start out returning nothing. 1590 */ 1591 *schemep = NULL; 1592 *userinfop = NULL; 1593 *hostp = NULL; 1594 *portp = NULL; 1595 *pathp = NULL; 1596 1597 /* 1598 * RFC 3986 says: 1599 * 1600 * URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] 1601 * 1602 * hier-part = "//" authority path-abempty 1603 * / path-absolute 1604 * / path-rootless 1605 * / path-empty 1606 * 1607 * authority = [ userinfo "@" ] host [ ":" port ] 1608 * 1609 * userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) 1610 * 1611 * Step 1: look for the ":" at the end of the scheme. 1612 * A colon in the source is *NOT* sufficient to indicate that 1613 * this is a URL, as interface names on some platforms might 1614 * include colons (e.g., I think some Solaris interfaces 1615 * might). 1616 */ 1617 colonp = strchr(source, ':'); 1618 if (colonp == NULL) { 1619 /* 1620 * The source is the device to open. 1621 * Return a NULL pointer for the scheme, user information, 1622 * host, and port, and return the device as the path. 1623 */ 1624 *pathp = strdup(source); 1625 if (*pathp == NULL) { 1626 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1627 errno, "malloc"); 1628 return (-1); 1629 } 1630 return (0); 1631 } 1632 1633 /* 1634 * All schemes must have "//" after them, i.e. we only support 1635 * hier-part = "//" authority path-abempty, not 1636 * hier-part = path-absolute 1637 * hier-part = path-rootless 1638 * hier-part = path-empty 1639 * 1640 * We need that in order to distinguish between a local device 1641 * name that happens to contain a colon and a URI. 1642 */ 1643 if (strncmp(colonp + 1, "//", 2) != 0) { 1644 /* 1645 * The source is the device to open. 1646 * Return a NULL pointer for the scheme, user information, 1647 * host, and port, and return the device as the path. 1648 */ 1649 *pathp = strdup(source); 1650 if (*pathp == NULL) { 1651 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1652 errno, "malloc"); 1653 return (-1); 1654 } 1655 return (0); 1656 } 1657 1658 /* 1659 * XXX - check whether the purported scheme could be a scheme? 1660 */ 1661 1662 /* 1663 * OK, this looks like a URL. 1664 * Get the scheme. 1665 */ 1666 scheme_len = colonp - source; 1667 scheme = malloc(scheme_len + 1); 1668 if (scheme == NULL) { 1669 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1670 errno, "malloc"); 1671 return (-1); 1672 } 1673 memcpy(scheme, source, scheme_len); 1674 scheme[scheme_len] = '\0'; 1675 1676 /* 1677 * Treat file: specially - take everything after file:// as 1678 * the pathname. 1679 */ 1680 if (pcap_strcasecmp(scheme, "file") == 0) { 1681 *pathp = strdup(colonp + 3); 1682 if (*pathp == NULL) { 1683 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1684 errno, "malloc"); 1685 free(scheme); 1686 return (-1); 1687 } 1688 *schemep = scheme; 1689 return (0); 1690 } 1691 1692 /* 1693 * The WinPcap documentation says you can specify a local 1694 * interface with "rpcap://{device}"; we special-case 1695 * that here. If the scheme is "rpcap", and there are 1696 * no slashes past the "//", we just return the device. 1697 * 1698 * XXX - %-escaping? 1699 */ 1700 if (pcap_strcasecmp(scheme, "rpcap") == 0 && 1701 strchr(colonp + 3, '/') == NULL) { 1702 /* 1703 * Local device. 1704 * 1705 * Return a NULL pointer for the scheme, user information, 1706 * host, and port, and return the device as the path. 1707 */ 1708 free(scheme); 1709 *pathp = strdup(colonp + 3); 1710 if (*pathp == NULL) { 1711 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1712 errno, "malloc"); 1713 return (-1); 1714 } 1715 return (0); 1716 } 1717 1718 /* 1719 * OK, now start parsing the authority. 1720 * Get token, terminated with / or terminated at the end of 1721 * the string. 1722 */ 1723 authority_len = strcspn(colonp + 3, "/"); 1724 authority = get_substring(colonp + 3, authority_len, ebuf); 1725 if (authority == NULL) { 1726 /* 1727 * Error. 1728 */ 1729 free(scheme); 1730 return (-1); 1731 } 1732 endp = colonp + 3 + authority_len; 1733 1734 /* 1735 * Now carve the authority field into its components. 1736 */ 1737 parsep = authority; 1738 1739 /* 1740 * Is there a userinfo field? 1741 */ 1742 atsignp = strchr(parsep, '@'); 1743 if (atsignp != NULL) { 1744 /* 1745 * Yes. 1746 */ 1747 size_t userinfo_len; 1748 1749 userinfo_len = atsignp - parsep; 1750 userinfo = get_substring(parsep, userinfo_len, ebuf); 1751 if (userinfo == NULL) { 1752 /* 1753 * Error. 1754 */ 1755 free(authority); 1756 free(scheme); 1757 return (-1); 1758 } 1759 parsep = atsignp + 1; 1760 } else { 1761 /* 1762 * No. 1763 */ 1764 userinfo = NULL; 1765 } 1766 1767 /* 1768 * Is there a host field? 1769 */ 1770 if (*parsep == '\0') { 1771 /* 1772 * No; there's no host field or port field. 1773 */ 1774 host = NULL; 1775 port = NULL; 1776 } else { 1777 /* 1778 * Yes. 1779 */ 1780 size_t host_len; 1781 1782 /* 1783 * Is it an IP-literal? 1784 */ 1785 if (*parsep == '[') { 1786 /* 1787 * Yes. 1788 * Treat verything up to the closing square 1789 * bracket as the IP-Literal; we don't worry 1790 * about whether it's a valid IPv6address or 1791 * IPvFuture (or an IPv4address, for that 1792 * matter, just in case we get handed a 1793 * URL with an IPv4 IP-Literal, of the sort 1794 * that pcap_createsrcstr() used to generate, 1795 * and that pcap_parsesrcstr(), in the original 1796 * WinPcap code, accepted). 1797 */ 1798 bracketp = strchr(parsep, ']'); 1799 if (bracketp == NULL) { 1800 /* 1801 * There's no closing square bracket. 1802 */ 1803 pcap_snprintf(ebuf, PCAP_ERRBUF_SIZE, 1804 "IP-literal in URL doesn't end with ]"); 1805 free(userinfo); 1806 free(authority); 1807 free(scheme); 1808 return (-1); 1809 } 1810 if (*(bracketp + 1) != '\0' && 1811 *(bracketp + 1) != ':') { 1812 /* 1813 * There's extra crud after the 1814 * closing square bracketn. 1815 */ 1816 pcap_snprintf(ebuf, PCAP_ERRBUF_SIZE, 1817 "Extra text after IP-literal in URL"); 1818 free(userinfo); 1819 free(authority); 1820 free(scheme); 1821 return (-1); 1822 } 1823 host_len = (bracketp - 1) - parsep; 1824 host = get_substring(parsep + 1, host_len, ebuf); 1825 if (host == NULL) { 1826 /* 1827 * Error. 1828 */ 1829 free(userinfo); 1830 free(authority); 1831 free(scheme); 1832 return (-1); 1833 } 1834 parsep = bracketp + 1; 1835 } else { 1836 /* 1837 * No. 1838 * Treat everything up to a : or the end of 1839 * the string as the host. 1840 */ 1841 host_len = strcspn(parsep, ":"); 1842 host = get_substring(parsep, host_len, ebuf); 1843 if (host == NULL) { 1844 /* 1845 * Error. 1846 */ 1847 free(userinfo); 1848 free(authority); 1849 free(scheme); 1850 return (-1); 1851 } 1852 parsep = parsep + host_len; 1853 } 1854 1855 /* 1856 * Is there a port field? 1857 */ 1858 if (*parsep == ':') { 1859 /* 1860 * Yes. It's the rest of the authority field. 1861 */ 1862 size_t port_len; 1863 1864 parsep++; 1865 port_len = strlen(parsep); 1866 port = get_substring(parsep, port_len, ebuf); 1867 if (port == NULL) { 1868 /* 1869 * Error. 1870 */ 1871 free(host); 1872 free(userinfo); 1873 free(authority); 1874 free(scheme); 1875 return (-1); 1876 } 1877 } else { 1878 /* 1879 * No. 1880 */ 1881 port = NULL; 1882 } 1883 } 1884 free(authority); 1885 1886 /* 1887 * Everything else is the path. Strip off the leading /. 1888 */ 1889 if (*endp == '\0') 1890 path = strdup(""); 1891 else 1892 path = strdup(endp + 1); 1893 if (path == NULL) { 1894 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1895 errno, "malloc"); 1896 free(port); 1897 free(host); 1898 free(userinfo); 1899 free(scheme); 1900 return (-1); 1901 } 1902 *schemep = scheme; 1903 *userinfop = userinfo; 1904 *hostp = host; 1905 *portp = port; 1906 *pathp = path; 1907 return (0); 1908 } 1909 1910 int 1911 pcap_createsrcstr(char *source, int type, const char *host, const char *port, 1912 const char *name, char *errbuf) 1913 { 1914 switch (type) { 1915 1916 case PCAP_SRC_FILE: 1917 pcap_strlcpy(source, PCAP_SRC_FILE_STRING, PCAP_BUF_SIZE); 1918 if (name != NULL && *name != '\0') { 1919 pcap_strlcat(source, name, PCAP_BUF_SIZE); 1920 return (0); 1921 } else { 1922 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1923 "The file name cannot be NULL."); 1924 return (-1); 1925 } 1926 1927 case PCAP_SRC_IFREMOTE: 1928 pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE); 1929 if (host != NULL && *host != '\0') { 1930 if (strchr(host, ':') != NULL) { 1931 /* 1932 * The host name contains a colon, so it's 1933 * probably an IPv6 address, and needs to 1934 * be included in square brackets. 1935 */ 1936 pcap_strlcat(source, "[", PCAP_BUF_SIZE); 1937 pcap_strlcat(source, host, PCAP_BUF_SIZE); 1938 pcap_strlcat(source, "]", PCAP_BUF_SIZE); 1939 } else 1940 pcap_strlcat(source, host, PCAP_BUF_SIZE); 1941 1942 if (port != NULL && *port != '\0') { 1943 pcap_strlcat(source, ":", PCAP_BUF_SIZE); 1944 pcap_strlcat(source, port, PCAP_BUF_SIZE); 1945 } 1946 1947 pcap_strlcat(source, "/", PCAP_BUF_SIZE); 1948 } else { 1949 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1950 "The host name cannot be NULL."); 1951 return (-1); 1952 } 1953 1954 if (name != NULL && *name != '\0') 1955 pcap_strlcat(source, name, PCAP_BUF_SIZE); 1956 1957 return (0); 1958 1959 case PCAP_SRC_IFLOCAL: 1960 pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE); 1961 1962 if (name != NULL && *name != '\0') 1963 pcap_strlcat(source, name, PCAP_BUF_SIZE); 1964 1965 return (0); 1966 1967 default: 1968 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1969 "The interface type is not valid."); 1970 return (-1); 1971 } 1972 } 1973 1974 int 1975 pcap_parsesrcstr(const char *source, int *type, char *host, char *port, 1976 char *name, char *errbuf) 1977 { 1978 char *scheme, *tmpuserinfo, *tmphost, *tmpport, *tmppath; 1979 1980 /* Initialization stuff */ 1981 if (host) 1982 *host = '\0'; 1983 if (port) 1984 *port = '\0'; 1985 if (name) 1986 *name = '\0'; 1987 1988 /* Parse the source string */ 1989 if (pcap_parse_source(source, &scheme, &tmpuserinfo, &tmphost, 1990 &tmpport, &tmppath, errbuf) == -1) { 1991 /* 1992 * Fail. 1993 */ 1994 return (-1); 1995 } 1996 1997 if (scheme == NULL) { 1998 /* 1999 * Local device. 2000 */ 2001 if (name && tmppath) 2002 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); 2003 if (type) 2004 *type = PCAP_SRC_IFLOCAL; 2005 free(tmppath); 2006 free(tmpport); 2007 free(tmphost); 2008 free(tmpuserinfo); 2009 return (0); 2010 } 2011 2012 if (strcmp(scheme, "rpcap") == 0) { 2013 /* 2014 * rpcap:// 2015 * 2016 * pcap_parse_source() has already handled the case of 2017 * rpcap://device 2018 */ 2019 if (host && tmphost) { 2020 if (tmpuserinfo) 2021 pcap_snprintf(host, PCAP_BUF_SIZE, "%s@%s", 2022 tmpuserinfo, tmphost); 2023 else 2024 pcap_strlcpy(host, tmphost, PCAP_BUF_SIZE); 2025 } 2026 if (port && tmpport) 2027 pcap_strlcpy(port, tmpport, PCAP_BUF_SIZE); 2028 if (name && tmppath) 2029 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); 2030 if (type) 2031 *type = PCAP_SRC_IFREMOTE; 2032 free(tmppath); 2033 free(tmpport); 2034 free(tmphost); 2035 free(tmpuserinfo); 2036 free(scheme); 2037 return (0); 2038 } 2039 2040 if (strcmp(scheme, "file") == 0) { 2041 /* 2042 * file:// 2043 */ 2044 if (name && tmppath) 2045 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); 2046 if (type) 2047 *type = PCAP_SRC_FILE; 2048 free(tmppath); 2049 free(tmpport); 2050 free(tmphost); 2051 free(tmpuserinfo); 2052 free(scheme); 2053 return (0); 2054 } 2055 2056 /* 2057 * Neither rpcap: nor file:; just treat the entire string 2058 * as a local device. 2059 */ 2060 if (name) 2061 pcap_strlcpy(name, source, PCAP_BUF_SIZE); 2062 if (type) 2063 *type = PCAP_SRC_IFLOCAL; 2064 free(tmppath); 2065 free(tmpport); 2066 free(tmphost); 2067 free(tmpuserinfo); 2068 free(scheme); 2069 return (0); 2070 } 2071 #endif 2072 2073 pcap_t * 2074 pcap_create(const char *device, char *errbuf) 2075 { 2076 size_t i; 2077 int is_theirs; 2078 pcap_t *p; 2079 char *device_str; 2080 2081 /* 2082 * A null device name is equivalent to the "any" device - 2083 * which might not be supported on this platform, but 2084 * this means that you'll get a "not supported" error 2085 * rather than, say, a crash when we try to dereference 2086 * the null pointer. 2087 */ 2088 if (device == NULL) 2089 device_str = strdup("any"); 2090 else { 2091 #ifdef _WIN32 2092 /* 2093 * On Windows, for backwards compatibility reasons, 2094 * pcap_lookupdev() returns a pointer to a sequence of 2095 * pairs of UTF-16LE device names and local code page 2096 * description strings. 2097 * 2098 * This means that if a program uses pcap_lookupdev() 2099 * to get a default device, and hands that to an API 2100 * that opens devices, we'll get handed a UTF-16LE 2101 * string, not a string in the local code page. 2102 * 2103 * To work around that, we check whether the string 2104 * looks as if it might be a UTF-16LE strinh and, if 2105 * so, convert it back to the local code page's 2106 * extended ASCII. 2107 * 2108 * XXX - you *cannot* reliably detect whether a 2109 * string is UTF-16LE or not; "a" could either 2110 * be a one-character ASCII string or the first 2111 * character of a UTF-16LE string. This particular 2112 * version of this heuristic dates back to WinPcap 2113 * 4.1.1; PacketOpenAdapter() does uses the same 2114 * heuristic, with the exact same vulnerability. 2115 */ 2116 if (device[0] != '\0' && device[1] == '\0') { 2117 size_t length; 2118 2119 length = wcslen((wchar_t *)device); 2120 device_str = (char *)malloc(length + 1); 2121 if (device_str == NULL) { 2122 pcap_fmt_errmsg_for_errno(errbuf, 2123 PCAP_ERRBUF_SIZE, errno, 2124 "malloc"); 2125 return (NULL); 2126 } 2127 2128 pcap_snprintf(device_str, length + 1, "%ws", 2129 (const wchar_t *)device); 2130 } else 2131 #endif 2132 device_str = strdup(device); 2133 } 2134 if (device_str == NULL) { 2135 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 2136 errno, "malloc"); 2137 return (NULL); 2138 } 2139 2140 /* 2141 * Try each of the non-local-network-interface capture 2142 * source types until we find one that works for this 2143 * device or run out of types. 2144 */ 2145 for (i = 0; capture_source_types[i].create_op != NULL; i++) { 2146 is_theirs = 0; 2147 p = capture_source_types[i].create_op(device_str, errbuf, 2148 &is_theirs); 2149 if (is_theirs) { 2150 /* 2151 * The device name refers to a device of the 2152 * type in question; either it succeeded, 2153 * in which case p refers to a pcap_t to 2154 * later activate for the device, or it 2155 * failed, in which case p is null and we 2156 * should return that to report the failure 2157 * to create. 2158 */ 2159 if (p == NULL) { 2160 /* 2161 * We assume the caller filled in errbuf. 2162 */ 2163 free(device_str); 2164 return (NULL); 2165 } 2166 p->opt.device = device_str; 2167 return (p); 2168 } 2169 } 2170 2171 /* 2172 * OK, try it as a regular network interface. 2173 */ 2174 p = pcap_create_interface(device_str, errbuf); 2175 if (p == NULL) { 2176 /* 2177 * We assume the caller filled in errbuf. 2178 */ 2179 free(device_str); 2180 return (NULL); 2181 } 2182 p->opt.device = device_str; 2183 return (p); 2184 } 2185 2186 /* 2187 * Set nonblocking mode on an unactivated pcap_t; this sets a flag 2188 * checked by pcap_activate(), which sets the mode after calling 2189 * the activate routine. 2190 */ 2191 static int 2192 pcap_setnonblock_unactivated(pcap_t *p, int nonblock) 2193 { 2194 p->opt.nonblock = nonblock; 2195 return (0); 2196 } 2197 2198 static void 2199 initialize_ops(pcap_t *p) 2200 { 2201 /* 2202 * Set operation pointers for operations that only work on 2203 * an activated pcap_t to point to a routine that returns 2204 * a "this isn't activated" error. 2205 */ 2206 p->read_op = pcap_read_not_initialized; 2207 p->inject_op = pcap_inject_not_initialized; 2208 p->setfilter_op = pcap_setfilter_not_initialized; 2209 p->setdirection_op = pcap_setdirection_not_initialized; 2210 p->set_datalink_op = pcap_set_datalink_not_initialized; 2211 p->getnonblock_op = pcap_getnonblock_not_initialized; 2212 p->stats_op = pcap_stats_not_initialized; 2213 #ifdef _WIN32 2214 p->stats_ex_op = pcap_stats_ex_not_initialized; 2215 p->setbuff_op = pcap_setbuff_not_initialized; 2216 p->setmode_op = pcap_setmode_not_initialized; 2217 p->setmintocopy_op = pcap_setmintocopy_not_initialized; 2218 p->getevent_op = pcap_getevent_not_initialized; 2219 p->oid_get_request_op = pcap_oid_get_request_not_initialized; 2220 p->oid_set_request_op = pcap_oid_set_request_not_initialized; 2221 p->sendqueue_transmit_op = pcap_sendqueue_transmit_not_initialized; 2222 p->setuserbuffer_op = pcap_setuserbuffer_not_initialized; 2223 p->live_dump_op = pcap_live_dump_not_initialized; 2224 p->live_dump_ended_op = pcap_live_dump_ended_not_initialized; 2225 p->get_airpcap_handle_op = pcap_get_airpcap_handle_not_initialized; 2226 #endif 2227 2228 /* 2229 * Default cleanup operation - implementations can override 2230 * this, but should call pcap_cleanup_live_common() after 2231 * doing their own additional cleanup. 2232 */ 2233 p->cleanup_op = pcap_cleanup_live_common; 2234 2235 /* 2236 * In most cases, the standard one-shot callback can 2237 * be used for pcap_next()/pcap_next_ex(). 2238 */ 2239 p->oneshot_callback = pcap_oneshot; 2240 } 2241 2242 static pcap_t * 2243 pcap_alloc_pcap_t(char *ebuf, size_t size) 2244 { 2245 char *chunk; 2246 pcap_t *p; 2247 2248 /* 2249 * Allocate a chunk of memory big enough for a pcap_t 2250 * plus a structure following it of size "size". The 2251 * structure following it is a private data structure 2252 * for the routines that handle this pcap_t. 2253 * 2254 * The structure following it must be aligned on 2255 * the appropriate alignment boundary for this platform. 2256 * We align on an 8-byte boundary as that's probably what 2257 * at least some platforms do, even with 32-bit integers, 2258 * and because we can't be sure that some values won't 2259 * require 8-byte alignment even on platforms with 32-bit 2260 * integers. 2261 */ 2262 #define PCAP_T_ALIGNED_SIZE ((sizeof(pcap_t) + 7U) & ~0x7U) 2263 chunk = malloc(PCAP_T_ALIGNED_SIZE + size); 2264 if (chunk == NULL) { 2265 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 2266 errno, "malloc"); 2267 return (NULL); 2268 } 2269 memset(chunk, 0, PCAP_T_ALIGNED_SIZE + size); 2270 2271 /* 2272 * Get a pointer to the pcap_t at the beginning. 2273 */ 2274 p = (pcap_t *)chunk; 2275 2276 #ifdef _WIN32 2277 p->handle = INVALID_HANDLE_VALUE; /* not opened yet */ 2278 #else /* _WIN32 */ 2279 p->fd = -1; /* not opened yet */ 2280 #ifndef MSDOS 2281 p->selectable_fd = -1; 2282 p->required_select_timeout = NULL; 2283 #endif /* MSDOS */ 2284 #endif /* _WIN32 */ 2285 2286 if (size == 0) { 2287 /* No private data was requested. */ 2288 p->priv = NULL; 2289 } else { 2290 /* 2291 * Set the pointer to the private data; that's the structure 2292 * of size "size" following the pcap_t. 2293 */ 2294 p->priv = (void *)(chunk + PCAP_T_ALIGNED_SIZE); 2295 } 2296 2297 return (p); 2298 } 2299 2300 pcap_t * 2301 pcap_create_common(char *ebuf, size_t size) 2302 { 2303 pcap_t *p; 2304 2305 p = pcap_alloc_pcap_t(ebuf, size); 2306 if (p == NULL) 2307 return (NULL); 2308 2309 /* 2310 * Default to "can't set rfmon mode"; if it's supported by 2311 * a platform, the create routine that called us can set 2312 * the op to its routine to check whether a particular 2313 * device supports it. 2314 */ 2315 p->can_set_rfmon_op = pcap_cant_set_rfmon; 2316 2317 /* 2318 * If pcap_setnonblock() is called on a not-yet-activated 2319 * pcap_t, default to setting a flag and turning 2320 * on non-blocking mode when activated. 2321 */ 2322 p->setnonblock_op = pcap_setnonblock_unactivated; 2323 2324 initialize_ops(p); 2325 2326 /* put in some defaults*/ 2327 p->snapshot = 0; /* max packet size unspecified */ 2328 p->opt.timeout = 0; /* no timeout specified */ 2329 p->opt.buffer_size = 0; /* use the platform's default */ 2330 p->opt.promisc = 0; 2331 p->opt.rfmon = 0; 2332 p->opt.immediate = 0; 2333 p->opt.tstamp_type = -1; /* default to not setting time stamp type */ 2334 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO; 2335 /* 2336 * Platform-dependent options. 2337 */ 2338 #ifdef __linux__ 2339 p->opt.protocol = 0; 2340 #endif 2341 #ifdef _WIN32 2342 p->opt.nocapture_local = 0; 2343 #endif 2344 2345 /* 2346 * Start out with no BPF code generation flags set. 2347 */ 2348 p->bpf_codegen_flags = 0; 2349 2350 return (p); 2351 } 2352 2353 int 2354 pcap_check_activated(pcap_t *p) 2355 { 2356 if (p->activated) { 2357 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform " 2358 " operation on activated capture"); 2359 return (-1); 2360 } 2361 return (0); 2362 } 2363 2364 int 2365 pcap_set_snaplen(pcap_t *p, int snaplen) 2366 { 2367 if (pcap_check_activated(p)) 2368 return (PCAP_ERROR_ACTIVATED); 2369 p->snapshot = snaplen; 2370 return (0); 2371 } 2372 2373 int 2374 pcap_set_promisc(pcap_t *p, int promisc) 2375 { 2376 if (pcap_check_activated(p)) 2377 return (PCAP_ERROR_ACTIVATED); 2378 p->opt.promisc = promisc; 2379 return (0); 2380 } 2381 2382 int 2383 pcap_set_rfmon(pcap_t *p, int rfmon) 2384 { 2385 if (pcap_check_activated(p)) 2386 return (PCAP_ERROR_ACTIVATED); 2387 p->opt.rfmon = rfmon; 2388 return (0); 2389 } 2390 2391 int 2392 pcap_set_timeout(pcap_t *p, int timeout_ms) 2393 { 2394 if (pcap_check_activated(p)) 2395 return (PCAP_ERROR_ACTIVATED); 2396 p->opt.timeout = timeout_ms; 2397 return (0); 2398 } 2399 2400 int 2401 pcap_set_tstamp_type(pcap_t *p, int tstamp_type) 2402 { 2403 int i; 2404 2405 if (pcap_check_activated(p)) 2406 return (PCAP_ERROR_ACTIVATED); 2407 2408 /* 2409 * The argument should have been u_int, but that's too late 2410 * to change now - it's an API. 2411 */ 2412 if (tstamp_type < 0) 2413 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP); 2414 2415 /* 2416 * If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST; 2417 * the default time stamp type is PCAP_TSTAMP_HOST. 2418 */ 2419 if (p->tstamp_type_count == 0) { 2420 if (tstamp_type == PCAP_TSTAMP_HOST) { 2421 p->opt.tstamp_type = tstamp_type; 2422 return (0); 2423 } 2424 } else { 2425 /* 2426 * Check whether we claim to support this type of time stamp. 2427 */ 2428 for (i = 0; i < p->tstamp_type_count; i++) { 2429 if (p->tstamp_type_list[i] == (u_int)tstamp_type) { 2430 /* 2431 * Yes. 2432 */ 2433 p->opt.tstamp_type = tstamp_type; 2434 return (0); 2435 } 2436 } 2437 } 2438 2439 /* 2440 * We don't support this type of time stamp. 2441 */ 2442 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP); 2443 } 2444 2445 int 2446 pcap_set_immediate_mode(pcap_t *p, int immediate) 2447 { 2448 if (pcap_check_activated(p)) 2449 return (PCAP_ERROR_ACTIVATED); 2450 p->opt.immediate = immediate; 2451 return (0); 2452 } 2453 2454 int 2455 pcap_set_buffer_size(pcap_t *p, int buffer_size) 2456 { 2457 if (pcap_check_activated(p)) 2458 return (PCAP_ERROR_ACTIVATED); 2459 if (buffer_size <= 0) { 2460 /* 2461 * Silently ignore invalid values. 2462 */ 2463 return (0); 2464 } 2465 p->opt.buffer_size = buffer_size; 2466 return (0); 2467 } 2468 2469 int 2470 pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision) 2471 { 2472 int i; 2473 2474 if (pcap_check_activated(p)) 2475 return (PCAP_ERROR_ACTIVATED); 2476 2477 /* 2478 * The argument should have been u_int, but that's too late 2479 * to change now - it's an API. 2480 */ 2481 if (tstamp_precision < 0) 2482 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP); 2483 2484 /* 2485 * If p->tstamp_precision_count is 0, we only support setting 2486 * the time stamp precision to microsecond precision; every 2487 * pcap module *MUST* support microsecond precision, even if 2488 * it does so by converting the native precision to 2489 * microseconds. 2490 */ 2491 if (p->tstamp_precision_count == 0) { 2492 if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) { 2493 p->opt.tstamp_precision = tstamp_precision; 2494 return (0); 2495 } 2496 } else { 2497 /* 2498 * Check whether we claim to support this precision of 2499 * time stamp. 2500 */ 2501 for (i = 0; i < p->tstamp_precision_count; i++) { 2502 if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) { 2503 /* 2504 * Yes. 2505 */ 2506 p->opt.tstamp_precision = tstamp_precision; 2507 return (0); 2508 } 2509 } 2510 } 2511 2512 /* 2513 * We don't support this time stamp precision. 2514 */ 2515 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP); 2516 } 2517 2518 int 2519 pcap_get_tstamp_precision(pcap_t *p) 2520 { 2521 return (p->opt.tstamp_precision); 2522 } 2523 2524 int 2525 pcap_activate(pcap_t *p) 2526 { 2527 int status; 2528 2529 /* 2530 * Catch attempts to re-activate an already-activated 2531 * pcap_t; this should, for example, catch code that 2532 * calls pcap_open_live() followed by pcap_activate(), 2533 * as some code that showed up in a Stack Exchange 2534 * question did. 2535 */ 2536 if (pcap_check_activated(p)) 2537 return (PCAP_ERROR_ACTIVATED); 2538 status = p->activate_op(p); 2539 if (status >= 0) { 2540 /* 2541 * If somebody requested non-blocking mode before 2542 * calling pcap_activate(), turn it on now. 2543 */ 2544 if (p->opt.nonblock) { 2545 status = p->setnonblock_op(p, 1); 2546 if (status < 0) { 2547 /* 2548 * Failed. Undo everything done by 2549 * the activate operation. 2550 */ 2551 p->cleanup_op(p); 2552 initialize_ops(p); 2553 return (status); 2554 } 2555 } 2556 p->activated = 1; 2557 } else { 2558 if (p->errbuf[0] == '\0') { 2559 /* 2560 * No error message supplied by the activate routine; 2561 * for the benefit of programs that don't specially 2562 * handle errors other than PCAP_ERROR, return the 2563 * error message corresponding to the status. 2564 */ 2565 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s", 2566 pcap_statustostr(status)); 2567 } 2568 2569 /* 2570 * Undo any operation pointer setting, etc. done by 2571 * the activate operation. 2572 */ 2573 initialize_ops(p); 2574 } 2575 return (status); 2576 } 2577 2578 pcap_t * 2579 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf) 2580 { 2581 pcap_t *p; 2582 int status; 2583 #ifdef ENABLE_REMOTE 2584 char host[PCAP_BUF_SIZE + 1]; 2585 char port[PCAP_BUF_SIZE + 1]; 2586 char name[PCAP_BUF_SIZE + 1]; 2587 int srctype; 2588 2589 /* 2590 * A null device name is equivalent to the "any" device - 2591 * which might not be supported on this platform, but 2592 * this means that you'll get a "not supported" error 2593 * rather than, say, a crash when we try to dereference 2594 * the null pointer. 2595 */ 2596 if (device == NULL) 2597 device = "any"; 2598 2599 /* 2600 * Retrofit - we have to make older applications compatible with 2601 * remote capture. 2602 * So we're calling pcap_open_remote() from here; this is a very 2603 * dirty hack. 2604 * Obviously, we cannot exploit all the new features; for instance, 2605 * we cannot send authentication, we cannot use a UDP data connection, 2606 * and so on. 2607 */ 2608 if (pcap_parsesrcstr(device, &srctype, host, port, name, errbuf)) 2609 return (NULL); 2610 2611 if (srctype == PCAP_SRC_IFREMOTE) { 2612 /* 2613 * Although we already have host, port and iface, we prefer 2614 * to pass only 'device' to pcap_open_rpcap(), so that it has 2615 * to call pcap_parsesrcstr() again. 2616 * This is less optimized, but much clearer. 2617 */ 2618 return (pcap_open_rpcap(device, snaplen, 2619 promisc ? PCAP_OPENFLAG_PROMISCUOUS : 0, to_ms, 2620 NULL, errbuf)); 2621 } 2622 if (srctype == PCAP_SRC_FILE) { 2623 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown URL scheme \"file\""); 2624 return (NULL); 2625 } 2626 if (srctype == PCAP_SRC_IFLOCAL) { 2627 /* 2628 * If it starts with rpcap://, that refers to a local device 2629 * (no host part in the URL). Remove the rpcap://, and 2630 * fall through to the regular open path. 2631 */ 2632 if (strncmp(device, PCAP_SRC_IF_STRING, strlen(PCAP_SRC_IF_STRING)) == 0) { 2633 size_t len = strlen(device) - strlen(PCAP_SRC_IF_STRING) + 1; 2634 2635 if (len > 0) 2636 device += strlen(PCAP_SRC_IF_STRING); 2637 } 2638 } 2639 #endif /* ENABLE_REMOTE */ 2640 2641 p = pcap_create(device, errbuf); 2642 if (p == NULL) 2643 return (NULL); 2644 status = pcap_set_snaplen(p, snaplen); 2645 if (status < 0) 2646 goto fail; 2647 status = pcap_set_promisc(p, promisc); 2648 if (status < 0) 2649 goto fail; 2650 status = pcap_set_timeout(p, to_ms); 2651 if (status < 0) 2652 goto fail; 2653 /* 2654 * Mark this as opened with pcap_open_live(), so that, for 2655 * example, we show the full list of DLT_ values, rather 2656 * than just the ones that are compatible with capturing 2657 * when not in monitor mode. That allows existing applications 2658 * to work the way they used to work, but allows new applications 2659 * that know about the new open API to, for example, find out the 2660 * DLT_ values that they can select without changing whether 2661 * the adapter is in monitor mode or not. 2662 */ 2663 p->oldstyle = 1; 2664 status = pcap_activate(p); 2665 if (status < 0) 2666 goto fail; 2667 return (p); 2668 fail: 2669 if (status == PCAP_ERROR) 2670 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %.*s", device, 2671 PCAP_ERRBUF_SIZE - 3, p->errbuf); 2672 else if (status == PCAP_ERROR_NO_SUCH_DEVICE || 2673 status == PCAP_ERROR_PERM_DENIED || 2674 status == PCAP_ERROR_PROMISC_PERM_DENIED) 2675 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%.*s)", device, 2676 pcap_statustostr(status), PCAP_ERRBUF_SIZE - 6, p->errbuf); 2677 else 2678 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device, 2679 pcap_statustostr(status)); 2680 pcap_close(p); 2681 return (NULL); 2682 } 2683 2684 pcap_t * 2685 pcap_open_offline_common(char *ebuf, size_t size) 2686 { 2687 pcap_t *p; 2688 2689 p = pcap_alloc_pcap_t(ebuf, size); 2690 if (p == NULL) 2691 return (NULL); 2692 2693 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO; 2694 2695 return (p); 2696 } 2697 2698 int 2699 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 2700 { 2701 return (p->read_op(p, cnt, callback, user)); 2702 } 2703 2704 int 2705 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 2706 { 2707 register int n; 2708 2709 for (;;) { 2710 if (p->rfile != NULL) { 2711 /* 2712 * 0 means EOF, so don't loop if we get 0. 2713 */ 2714 n = pcap_offline_read(p, cnt, callback, user); 2715 } else { 2716 /* 2717 * XXX keep reading until we get something 2718 * (or an error occurs) 2719 */ 2720 do { 2721 n = p->read_op(p, cnt, callback, user); 2722 } while (n == 0); 2723 } 2724 if (n <= 0) 2725 return (n); 2726 if (!PACKET_COUNT_IS_UNLIMITED(cnt)) { 2727 cnt -= n; 2728 if (cnt <= 0) 2729 return (0); 2730 } 2731 } 2732 } 2733 2734 /* 2735 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate. 2736 */ 2737 void 2738 pcap_breakloop(pcap_t *p) 2739 { 2740 p->break_loop = 1; 2741 } 2742 2743 int 2744 pcap_datalink(pcap_t *p) 2745 { 2746 if (!p->activated) 2747 return (PCAP_ERROR_NOT_ACTIVATED); 2748 return (p->linktype); 2749 } 2750 2751 int 2752 pcap_datalink_ext(pcap_t *p) 2753 { 2754 if (!p->activated) 2755 return (PCAP_ERROR_NOT_ACTIVATED); 2756 return (p->linktype_ext); 2757 } 2758 2759 int 2760 pcap_list_datalinks(pcap_t *p, int **dlt_buffer) 2761 { 2762 if (!p->activated) 2763 return (PCAP_ERROR_NOT_ACTIVATED); 2764 if (p->dlt_count == 0) { 2765 /* 2766 * We couldn't fetch the list of DLTs, which means 2767 * this platform doesn't support changing the 2768 * DLT for an interface. Return a list of DLTs 2769 * containing only the DLT this device supports. 2770 */ 2771 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); 2772 if (*dlt_buffer == NULL) { 2773 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 2774 errno, "malloc"); 2775 return (PCAP_ERROR); 2776 } 2777 **dlt_buffer = p->linktype; 2778 return (1); 2779 } else { 2780 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count); 2781 if (*dlt_buffer == NULL) { 2782 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 2783 errno, "malloc"); 2784 return (PCAP_ERROR); 2785 } 2786 (void)memcpy(*dlt_buffer, p->dlt_list, 2787 sizeof(**dlt_buffer) * p->dlt_count); 2788 return (p->dlt_count); 2789 } 2790 } 2791 2792 /* 2793 * In Windows, you might have a library built with one version of the 2794 * C runtime library and an application built with another version of 2795 * the C runtime library, which means that the library might use one 2796 * version of malloc() and free() and the application might use another 2797 * version of malloc() and free(). If so, that means something 2798 * allocated by the library cannot be freed by the application, so we 2799 * need to have a pcap_free_datalinks() routine to free up the list 2800 * allocated by pcap_list_datalinks(), even though it's just a wrapper 2801 * around free(). 2802 */ 2803 void 2804 pcap_free_datalinks(int *dlt_list) 2805 { 2806 free(dlt_list); 2807 } 2808 2809 int 2810 pcap_set_datalink(pcap_t *p, int dlt) 2811 { 2812 int i; 2813 const char *dlt_name; 2814 2815 if (dlt < 0) 2816 goto unsupported; 2817 2818 if (p->dlt_count == 0 || p->set_datalink_op == NULL) { 2819 /* 2820 * We couldn't fetch the list of DLTs, or we don't 2821 * have a "set datalink" operation, which means 2822 * this platform doesn't support changing the 2823 * DLT for an interface. Check whether the new 2824 * DLT is the one this interface supports. 2825 */ 2826 if (p->linktype != dlt) 2827 goto unsupported; 2828 2829 /* 2830 * It is, so there's nothing we need to do here. 2831 */ 2832 return (0); 2833 } 2834 for (i = 0; i < p->dlt_count; i++) 2835 if (p->dlt_list[i] == (u_int)dlt) 2836 break; 2837 if (i >= p->dlt_count) 2838 goto unsupported; 2839 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB && 2840 dlt == DLT_DOCSIS) { 2841 /* 2842 * This is presumably an Ethernet device, as the first 2843 * link-layer type it offers is DLT_EN10MB, and the only 2844 * other type it offers is DLT_DOCSIS. That means that 2845 * we can't tell the driver to supply DOCSIS link-layer 2846 * headers - we're just pretending that's what we're 2847 * getting, as, presumably, we're capturing on a dedicated 2848 * link to a Cisco Cable Modem Termination System, and 2849 * it's putting raw DOCSIS frames on the wire inside low-level 2850 * Ethernet framing. 2851 */ 2852 p->linktype = dlt; 2853 return (0); 2854 } 2855 if (p->set_datalink_op(p, dlt) == -1) 2856 return (-1); 2857 p->linktype = dlt; 2858 return (0); 2859 2860 unsupported: 2861 dlt_name = pcap_datalink_val_to_name(dlt); 2862 if (dlt_name != NULL) { 2863 (void) pcap_snprintf(p->errbuf, sizeof(p->errbuf), 2864 "%s is not one of the DLTs supported by this device", 2865 dlt_name); 2866 } else { 2867 (void) pcap_snprintf(p->errbuf, sizeof(p->errbuf), 2868 "DLT %d is not one of the DLTs supported by this device", 2869 dlt); 2870 } 2871 return (-1); 2872 } 2873 2874 /* 2875 * This array is designed for mapping upper and lower case letter 2876 * together for a case independent comparison. The mappings are 2877 * based upon ascii character sequences. 2878 */ 2879 static const u_char charmap[] = { 2880 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003', 2881 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007', 2882 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013', 2883 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017', 2884 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023', 2885 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027', 2886 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033', 2887 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037', 2888 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043', 2889 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047', 2890 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053', 2891 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057', 2892 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063', 2893 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067', 2894 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073', 2895 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077', 2896 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143', 2897 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 2898 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 2899 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 2900 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 2901 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 2902 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133', 2903 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137', 2904 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143', 2905 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 2906 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 2907 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 2908 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 2909 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 2910 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173', 2911 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177', 2912 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203', 2913 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207', 2914 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213', 2915 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217', 2916 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223', 2917 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227', 2918 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233', 2919 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237', 2920 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243', 2921 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247', 2922 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253', 2923 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257', 2924 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263', 2925 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267', 2926 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273', 2927 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277', 2928 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343', 2929 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 2930 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 2931 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 2932 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 2933 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 2934 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333', 2935 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337', 2936 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343', 2937 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 2938 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 2939 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 2940 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 2941 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 2942 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373', 2943 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377', 2944 }; 2945 2946 int 2947 pcap_strcasecmp(const char *s1, const char *s2) 2948 { 2949 register const u_char *cm = charmap, 2950 *us1 = (const u_char *)s1, 2951 *us2 = (const u_char *)s2; 2952 2953 while (cm[*us1] == cm[*us2++]) 2954 if (*us1++ == '\0') 2955 return(0); 2956 return (cm[*us1] - cm[*--us2]); 2957 } 2958 2959 struct dlt_choice { 2960 const char *name; 2961 const char *description; 2962 int dlt; 2963 }; 2964 2965 #define DLT_CHOICE(code, description) { #code, description, DLT_ ## code } 2966 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 } 2967 2968 static struct dlt_choice dlt_choices[] = { 2969 DLT_CHOICE(NULL, "BSD loopback"), 2970 DLT_CHOICE(EN10MB, "Ethernet"), 2971 DLT_CHOICE(IEEE802, "Token ring"), 2972 DLT_CHOICE(ARCNET, "BSD ARCNET"), 2973 DLT_CHOICE(SLIP, "SLIP"), 2974 DLT_CHOICE(PPP, "PPP"), 2975 DLT_CHOICE(FDDI, "FDDI"), 2976 DLT_CHOICE(ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"), 2977 DLT_CHOICE(RAW, "Raw IP"), 2978 DLT_CHOICE(SLIP_BSDOS, "BSD/OS SLIP"), 2979 DLT_CHOICE(PPP_BSDOS, "BSD/OS PPP"), 2980 DLT_CHOICE(ATM_CLIP, "Linux Classical IP-over-ATM"), 2981 DLT_CHOICE(PPP_SERIAL, "PPP over serial"), 2982 DLT_CHOICE(PPP_ETHER, "PPPoE"), 2983 DLT_CHOICE(SYMANTEC_FIREWALL, "Symantec Firewall"), 2984 DLT_CHOICE(C_HDLC, "Cisco HDLC"), 2985 DLT_CHOICE(IEEE802_11, "802.11"), 2986 DLT_CHOICE(FRELAY, "Frame Relay"), 2987 DLT_CHOICE(LOOP, "OpenBSD loopback"), 2988 DLT_CHOICE(ENC, "OpenBSD encapsulated IP"), 2989 DLT_CHOICE(LINUX_SLL, "Linux cooked v1"), 2990 DLT_CHOICE(LTALK, "Localtalk"), 2991 DLT_CHOICE(PFLOG, "OpenBSD pflog file"), 2992 DLT_CHOICE(PFSYNC, "Packet filter state syncing"), 2993 DLT_CHOICE(PRISM_HEADER, "802.11 plus Prism header"), 2994 DLT_CHOICE(IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"), 2995 DLT_CHOICE(SUNATM, "Sun raw ATM"), 2996 DLT_CHOICE(IEEE802_11_RADIO, "802.11 plus radiotap header"), 2997 DLT_CHOICE(ARCNET_LINUX, "Linux ARCNET"), 2998 DLT_CHOICE(JUNIPER_MLPPP, "Juniper Multi-Link PPP"), 2999 DLT_CHOICE(JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"), 3000 DLT_CHOICE(JUNIPER_ES, "Juniper Encryption Services PIC"), 3001 DLT_CHOICE(JUNIPER_GGSN, "Juniper GGSN PIC"), 3002 DLT_CHOICE(JUNIPER_MFR, "Juniper FRF.16 Frame Relay"), 3003 DLT_CHOICE(JUNIPER_ATM2, "Juniper ATM2 PIC"), 3004 DLT_CHOICE(JUNIPER_SERVICES, "Juniper Advanced Services PIC"), 3005 DLT_CHOICE(JUNIPER_ATM1, "Juniper ATM1 PIC"), 3006 DLT_CHOICE(APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"), 3007 DLT_CHOICE(MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"), 3008 DLT_CHOICE(MTP2, "SS7 MTP2"), 3009 DLT_CHOICE(MTP3, "SS7 MTP3"), 3010 DLT_CHOICE(SCCP, "SS7 SCCP"), 3011 DLT_CHOICE(DOCSIS, "DOCSIS"), 3012 DLT_CHOICE(LINUX_IRDA, "Linux IrDA"), 3013 DLT_CHOICE(IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"), 3014 DLT_CHOICE(JUNIPER_MONITOR, "Juniper Passive Monitor PIC"), 3015 DLT_CHOICE(BACNET_MS_TP, "BACnet MS/TP"), 3016 DLT_CHOICE(PPP_PPPD, "PPP for pppd, with direction flag"), 3017 DLT_CHOICE(JUNIPER_PPPOE, "Juniper PPPoE"), 3018 DLT_CHOICE(JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"), 3019 DLT_CHOICE(GPRS_LLC, "GPRS LLC"), 3020 DLT_CHOICE(GPF_T, "GPF-T"), 3021 DLT_CHOICE(GPF_F, "GPF-F"), 3022 DLT_CHOICE(JUNIPER_PIC_PEER, "Juniper PIC Peer"), 3023 DLT_CHOICE(ERF_ETH, "Ethernet with Endace ERF header"), 3024 DLT_CHOICE(ERF_POS, "Packet-over-SONET with Endace ERF header"), 3025 DLT_CHOICE(LINUX_LAPD, "Linux vISDN LAPD"), 3026 DLT_CHOICE(JUNIPER_ETHER, "Juniper Ethernet"), 3027 DLT_CHOICE(JUNIPER_PPP, "Juniper PPP"), 3028 DLT_CHOICE(JUNIPER_FRELAY, "Juniper Frame Relay"), 3029 DLT_CHOICE(JUNIPER_CHDLC, "Juniper C-HDLC"), 3030 DLT_CHOICE(MFR, "FRF.16 Frame Relay"), 3031 DLT_CHOICE(JUNIPER_VP, "Juniper Voice PIC"), 3032 DLT_CHOICE(A429, "Arinc 429"), 3033 DLT_CHOICE(A653_ICM, "Arinc 653 Interpartition Communication"), 3034 DLT_CHOICE(USB_FREEBSD, "USB with FreeBSD header"), 3035 DLT_CHOICE(BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"), 3036 DLT_CHOICE(IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"), 3037 DLT_CHOICE(USB_LINUX, "USB with Linux header"), 3038 DLT_CHOICE(CAN20B, "Controller Area Network (CAN) v. 2.0B"), 3039 DLT_CHOICE(IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"), 3040 DLT_CHOICE(PPI, "Per-Packet Information"), 3041 DLT_CHOICE(IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"), 3042 DLT_CHOICE(JUNIPER_ISM, "Juniper Integrated Service Module"), 3043 DLT_CHOICE(IEEE802_15_4, "IEEE 802.15.4 with FCS"), 3044 DLT_CHOICE(SITA, "SITA pseudo-header"), 3045 DLT_CHOICE(ERF, "Endace ERF header"), 3046 DLT_CHOICE(RAIF1, "Ethernet with u10 Networks pseudo-header"), 3047 DLT_CHOICE(IPMB_KONTRON, "IPMB with Kontron pseudo-header"), 3048 DLT_CHOICE(JUNIPER_ST, "Juniper Secure Tunnel"), 3049 DLT_CHOICE(BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"), 3050 DLT_CHOICE(AX25_KISS, "AX.25 with KISS header"), 3051 DLT_CHOICE(IPMB_LINUX, "IPMB with Linux/Pigeon Point pseudo-header"), 3052 DLT_CHOICE(IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"), 3053 DLT_CHOICE(MPLS, "MPLS with label as link-layer header"), 3054 DLT_CHOICE(LINUX_EVDEV, "Linux evdev events"), 3055 DLT_CHOICE(USB_LINUX_MMAPPED, "USB with padded Linux header"), 3056 DLT_CHOICE(DECT, "DECT"), 3057 DLT_CHOICE(AOS, "AOS Space Data Link protocol"), 3058 DLT_CHOICE(WIHART, "Wireless HART"), 3059 DLT_CHOICE(FC_2, "Fibre Channel FC-2"), 3060 DLT_CHOICE(FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"), 3061 DLT_CHOICE(IPNET, "Solaris ipnet"), 3062 DLT_CHOICE(CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"), 3063 DLT_CHOICE(IPV4, "Raw IPv4"), 3064 DLT_CHOICE(IPV6, "Raw IPv6"), 3065 DLT_CHOICE(IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"), 3066 DLT_CHOICE(DBUS, "D-Bus"), 3067 DLT_CHOICE(JUNIPER_VS, "Juniper Virtual Server"), 3068 DLT_CHOICE(JUNIPER_SRX_E2E, "Juniper SRX E2E"), 3069 DLT_CHOICE(JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"), 3070 DLT_CHOICE(DVB_CI, "DVB-CI"), 3071 DLT_CHOICE(MUX27010, "MUX27010"), 3072 DLT_CHOICE(STANAG_5066_D_PDU, "STANAG 5066 D_PDUs"), 3073 DLT_CHOICE(JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"), 3074 DLT_CHOICE(NFLOG, "Linux netfilter log messages"), 3075 DLT_CHOICE(NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"), 3076 DLT_CHOICE(NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"), 3077 DLT_CHOICE(IPOIB, "RFC 4391 IP-over-Infiniband"), 3078 DLT_CHOICE(MPEG_2_TS, "MPEG-2 transport stream"), 3079 DLT_CHOICE(NG40, "ng40 protocol tester Iub/Iur"), 3080 DLT_CHOICE(NFC_LLCP, "NFC LLCP PDUs with pseudo-header"), 3081 DLT_CHOICE(INFINIBAND, "InfiniBand"), 3082 DLT_CHOICE(SCTP, "SCTP"), 3083 DLT_CHOICE(USBPCAP, "USB with USBPcap header"), 3084 DLT_CHOICE(RTAC_SERIAL, "Schweitzer Engineering Laboratories RTAC packets"), 3085 DLT_CHOICE(BLUETOOTH_LE_LL, "Bluetooth Low Energy air interface"), 3086 DLT_CHOICE(NETLINK, "Linux netlink"), 3087 DLT_CHOICE(BLUETOOTH_LINUX_MONITOR, "Bluetooth Linux Monitor"), 3088 DLT_CHOICE(BLUETOOTH_BREDR_BB, "Bluetooth Basic Rate/Enhanced Data Rate baseband packets"), 3089 DLT_CHOICE(BLUETOOTH_LE_LL_WITH_PHDR, "Bluetooth Low Energy air interface with pseudo-header"), 3090 DLT_CHOICE(PROFIBUS_DL, "PROFIBUS data link layer"), 3091 DLT_CHOICE(PKTAP, "Apple DLT_PKTAP"), 3092 DLT_CHOICE(EPON, "Ethernet with 802.3 Clause 65 EPON preamble"), 3093 DLT_CHOICE(IPMI_HPM_2, "IPMI trace packets"), 3094 DLT_CHOICE(ZWAVE_R1_R2, "Z-Wave RF profile R1 and R2 packets"), 3095 DLT_CHOICE(ZWAVE_R3, "Z-Wave RF profile R3 packets"), 3096 DLT_CHOICE(WATTSTOPPER_DLM, "WattStopper Digital Lighting Management (DLM) and Legrand Nitoo Open protocol"), 3097 DLT_CHOICE(ISO_14443, "ISO 14443 messages"), 3098 DLT_CHOICE(RDS, "IEC 62106 Radio Data System groups"), 3099 DLT_CHOICE(USB_DARWIN, "USB with Darwin header"), 3100 DLT_CHOICE(OPENFLOW, "OpenBSD DLT_OPENFLOW"), 3101 DLT_CHOICE(SDLC, "IBM SDLC frames"), 3102 DLT_CHOICE(TI_LLN_SNIFFER, "TI LLN sniffer frames"), 3103 DLT_CHOICE(VSOCK, "Linux vsock"), 3104 DLT_CHOICE(NORDIC_BLE, "Nordic Semiconductor Bluetooth LE sniffer frames"), 3105 DLT_CHOICE(DOCSIS31_XRA31, "Excentis XRA-31 DOCSIS 3.1 RF sniffer frames"), 3106 DLT_CHOICE(ETHERNET_MPACKET, "802.3br mPackets"), 3107 DLT_CHOICE(DISPLAYPORT_AUX, "DisplayPort AUX channel monitoring data"), 3108 DLT_CHOICE(LINUX_SLL2, "Linux cooked v2"), 3109 DLT_CHOICE_SENTINEL 3110 }; 3111 3112 int 3113 pcap_datalink_name_to_val(const char *name) 3114 { 3115 int i; 3116 3117 for (i = 0; dlt_choices[i].name != NULL; i++) { 3118 if (pcap_strcasecmp(dlt_choices[i].name, name) == 0) 3119 return (dlt_choices[i].dlt); 3120 } 3121 return (-1); 3122 } 3123 3124 const char * 3125 pcap_datalink_val_to_name(int dlt) 3126 { 3127 int i; 3128 3129 for (i = 0; dlt_choices[i].name != NULL; i++) { 3130 if (dlt_choices[i].dlt == dlt) 3131 return (dlt_choices[i].name); 3132 } 3133 return (NULL); 3134 } 3135 3136 const char * 3137 pcap_datalink_val_to_description(int dlt) 3138 { 3139 int i; 3140 3141 for (i = 0; dlt_choices[i].name != NULL; i++) { 3142 if (dlt_choices[i].dlt == dlt) 3143 return (dlt_choices[i].description); 3144 } 3145 return (NULL); 3146 } 3147 3148 const char * 3149 pcap_datalink_val_to_description_or_dlt(int dlt) 3150 { 3151 static char unkbuf[40]; 3152 const char *description; 3153 3154 description = pcap_datalink_val_to_description(dlt); 3155 if (description != NULL) { 3156 return description; 3157 } else { 3158 (void)pcap_snprintf(unkbuf, sizeof(unkbuf), "DLT %u", dlt); 3159 return unkbuf; 3160 } 3161 } 3162 3163 struct tstamp_type_choice { 3164 const char *name; 3165 const char *description; 3166 int type; 3167 }; 3168 3169 static struct tstamp_type_choice tstamp_type_choices[] = { 3170 { "host", "Host", PCAP_TSTAMP_HOST }, 3171 { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC }, 3172 { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC }, 3173 { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER }, 3174 { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED }, 3175 { NULL, NULL, 0 } 3176 }; 3177 3178 int 3179 pcap_tstamp_type_name_to_val(const char *name) 3180 { 3181 int i; 3182 3183 for (i = 0; tstamp_type_choices[i].name != NULL; i++) { 3184 if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0) 3185 return (tstamp_type_choices[i].type); 3186 } 3187 return (PCAP_ERROR); 3188 } 3189 3190 const char * 3191 pcap_tstamp_type_val_to_name(int tstamp_type) 3192 { 3193 int i; 3194 3195 for (i = 0; tstamp_type_choices[i].name != NULL; i++) { 3196 if (tstamp_type_choices[i].type == tstamp_type) 3197 return (tstamp_type_choices[i].name); 3198 } 3199 return (NULL); 3200 } 3201 3202 const char * 3203 pcap_tstamp_type_val_to_description(int tstamp_type) 3204 { 3205 int i; 3206 3207 for (i = 0; tstamp_type_choices[i].name != NULL; i++) { 3208 if (tstamp_type_choices[i].type == tstamp_type) 3209 return (tstamp_type_choices[i].description); 3210 } 3211 return (NULL); 3212 } 3213 3214 int 3215 pcap_snapshot(pcap_t *p) 3216 { 3217 if (!p->activated) 3218 return (PCAP_ERROR_NOT_ACTIVATED); 3219 return (p->snapshot); 3220 } 3221 3222 int 3223 pcap_is_swapped(pcap_t *p) 3224 { 3225 if (!p->activated) 3226 return (PCAP_ERROR_NOT_ACTIVATED); 3227 return (p->swapped); 3228 } 3229 3230 int 3231 pcap_major_version(pcap_t *p) 3232 { 3233 if (!p->activated) 3234 return (PCAP_ERROR_NOT_ACTIVATED); 3235 return (p->version_major); 3236 } 3237 3238 int 3239 pcap_minor_version(pcap_t *p) 3240 { 3241 if (!p->activated) 3242 return (PCAP_ERROR_NOT_ACTIVATED); 3243 return (p->version_minor); 3244 } 3245 3246 int 3247 pcap_bufsize(pcap_t *p) 3248 { 3249 if (!p->activated) 3250 return (PCAP_ERROR_NOT_ACTIVATED); 3251 return (p->bufsize); 3252 } 3253 3254 FILE * 3255 pcap_file(pcap_t *p) 3256 { 3257 return (p->rfile); 3258 } 3259 3260 int 3261 pcap_fileno(pcap_t *p) 3262 { 3263 #ifndef _WIN32 3264 return (p->fd); 3265 #else 3266 if (p->handle != INVALID_HANDLE_VALUE) 3267 return ((int)(DWORD)p->handle); 3268 else 3269 return (PCAP_ERROR); 3270 #endif 3271 } 3272 3273 #if !defined(_WIN32) && !defined(MSDOS) 3274 int 3275 pcap_get_selectable_fd(pcap_t *p) 3276 { 3277 return (p->selectable_fd); 3278 } 3279 3280 struct timeval * 3281 pcap_get_required_select_timeout(pcap_t *p) 3282 { 3283 return (p->required_select_timeout); 3284 } 3285 #endif 3286 3287 void 3288 pcap_perror(pcap_t *p, const char *prefix) 3289 { 3290 fprintf(stderr, "%s: %s\n", prefix, p->errbuf); 3291 } 3292 3293 char * 3294 pcap_geterr(pcap_t *p) 3295 { 3296 return (p->errbuf); 3297 } 3298 3299 int 3300 pcap_getnonblock(pcap_t *p, char *errbuf) 3301 { 3302 int ret; 3303 3304 ret = p->getnonblock_op(p); 3305 if (ret == -1) { 3306 /* 3307 * The get nonblock operation sets p->errbuf; this 3308 * function *shouldn't* have had a separate errbuf 3309 * argument, as it didn't need one, but I goofed 3310 * when adding it. 3311 * 3312 * We copy the error message to errbuf, so callers 3313 * can find it in either place. 3314 */ 3315 pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE); 3316 } 3317 return (ret); 3318 } 3319 3320 /* 3321 * Get the current non-blocking mode setting, under the assumption that 3322 * it's just the standard POSIX non-blocking flag. 3323 */ 3324 #if !defined(_WIN32) && !defined(MSDOS) 3325 int 3326 pcap_getnonblock_fd(pcap_t *p) 3327 { 3328 int fdflags; 3329 3330 fdflags = fcntl(p->fd, F_GETFL, 0); 3331 if (fdflags == -1) { 3332 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 3333 errno, "F_GETFL"); 3334 return (-1); 3335 } 3336 if (fdflags & O_NONBLOCK) 3337 return (1); 3338 else 3339 return (0); 3340 } 3341 #endif 3342 3343 int 3344 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) 3345 { 3346 int ret; 3347 3348 ret = p->setnonblock_op(p, nonblock); 3349 if (ret == -1) { 3350 /* 3351 * The set nonblock operation sets p->errbuf; this 3352 * function *shouldn't* have had a separate errbuf 3353 * argument, as it didn't need one, but I goofed 3354 * when adding it. 3355 * 3356 * We copy the error message to errbuf, so callers 3357 * can find it in either place. 3358 */ 3359 pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE); 3360 } 3361 return (ret); 3362 } 3363 3364 #if !defined(_WIN32) && !defined(MSDOS) 3365 /* 3366 * Set non-blocking mode, under the assumption that it's just the 3367 * standard POSIX non-blocking flag. (This can be called by the 3368 * per-platform non-blocking-mode routine if that routine also 3369 * needs to do some additional work.) 3370 */ 3371 int 3372 pcap_setnonblock_fd(pcap_t *p, int nonblock) 3373 { 3374 int fdflags; 3375 3376 fdflags = fcntl(p->fd, F_GETFL, 0); 3377 if (fdflags == -1) { 3378 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 3379 errno, "F_GETFL"); 3380 return (-1); 3381 } 3382 if (nonblock) 3383 fdflags |= O_NONBLOCK; 3384 else 3385 fdflags &= ~O_NONBLOCK; 3386 if (fcntl(p->fd, F_SETFL, fdflags) == -1) { 3387 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 3388 errno, "F_SETFL"); 3389 return (-1); 3390 } 3391 return (0); 3392 } 3393 #endif 3394 3395 /* 3396 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values. 3397 */ 3398 const char * 3399 pcap_statustostr(int errnum) 3400 { 3401 static char ebuf[15+10+1]; 3402 3403 switch (errnum) { 3404 3405 case PCAP_WARNING: 3406 return("Generic warning"); 3407 3408 case PCAP_WARNING_TSTAMP_TYPE_NOTSUP: 3409 return ("That type of time stamp is not supported by that device"); 3410 3411 case PCAP_WARNING_PROMISC_NOTSUP: 3412 return ("That device doesn't support promiscuous mode"); 3413 3414 case PCAP_ERROR: 3415 return("Generic error"); 3416 3417 case PCAP_ERROR_BREAK: 3418 return("Loop terminated by pcap_breakloop"); 3419 3420 case PCAP_ERROR_NOT_ACTIVATED: 3421 return("The pcap_t has not been activated"); 3422 3423 case PCAP_ERROR_ACTIVATED: 3424 return ("The setting can't be changed after the pcap_t is activated"); 3425 3426 case PCAP_ERROR_NO_SUCH_DEVICE: 3427 return ("No such device exists"); 3428 3429 case PCAP_ERROR_RFMON_NOTSUP: 3430 return ("That device doesn't support monitor mode"); 3431 3432 case PCAP_ERROR_NOT_RFMON: 3433 return ("That operation is supported only in monitor mode"); 3434 3435 case PCAP_ERROR_PERM_DENIED: 3436 return ("You don't have permission to capture on that device"); 3437 3438 case PCAP_ERROR_IFACE_NOT_UP: 3439 return ("That device is not up"); 3440 3441 case PCAP_ERROR_CANTSET_TSTAMP_TYPE: 3442 return ("That device doesn't support setting the time stamp type"); 3443 3444 case PCAP_ERROR_PROMISC_PERM_DENIED: 3445 return ("You don't have permission to capture in promiscuous mode on that device"); 3446 3447 case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP: 3448 return ("That device doesn't support that time stamp precision"); 3449 } 3450 (void)pcap_snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 3451 return(ebuf); 3452 } 3453 3454 /* 3455 * Not all systems have strerror(). 3456 */ 3457 const char * 3458 pcap_strerror(int errnum) 3459 { 3460 #ifdef HAVE_STRERROR 3461 #ifdef _WIN32 3462 static char errbuf[PCAP_ERRBUF_SIZE]; 3463 errno_t err = strerror_s(errbuf, PCAP_ERRBUF_SIZE, errnum); 3464 3465 if (err != 0) /* err = 0 if successful */ 3466 pcap_strlcpy(errbuf, "strerror_s() error", PCAP_ERRBUF_SIZE); 3467 return (errbuf); 3468 #else 3469 return (strerror(errnum)); 3470 #endif /* _WIN32 */ 3471 #else 3472 extern int sys_nerr; 3473 extern const char *const sys_errlist[]; 3474 static char errbuf[PCAP_ERRBUF_SIZE]; 3475 3476 if ((unsigned int)errnum < sys_nerr) 3477 return ((char *)sys_errlist[errnum]); 3478 (void)pcap_snprintf(errbuf, sizeof errbuf, "Unknown error: %d", errnum); 3479 return (errbuf); 3480 #endif 3481 } 3482 3483 int 3484 pcap_setfilter(pcap_t *p, struct bpf_program *fp) 3485 { 3486 return (p->setfilter_op(p, fp)); 3487 } 3488 3489 /* 3490 * Set direction flag, which controls whether we accept only incoming 3491 * packets, only outgoing packets, or both. 3492 * Note that, depending on the platform, some or all direction arguments 3493 * might not be supported. 3494 */ 3495 int 3496 pcap_setdirection(pcap_t *p, pcap_direction_t d) 3497 { 3498 if (p->setdirection_op == NULL) { 3499 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3500 "Setting direction is not implemented on this platform"); 3501 return (-1); 3502 } else 3503 return (p->setdirection_op(p, d)); 3504 } 3505 3506 int 3507 pcap_stats(pcap_t *p, struct pcap_stat *ps) 3508 { 3509 return (p->stats_op(p, ps)); 3510 } 3511 3512 #ifdef _WIN32 3513 struct pcap_stat * 3514 pcap_stats_ex(pcap_t *p, int *pcap_stat_size) 3515 { 3516 return (p->stats_ex_op(p, pcap_stat_size)); 3517 } 3518 3519 int 3520 pcap_setbuff(pcap_t *p, int dim) 3521 { 3522 return (p->setbuff_op(p, dim)); 3523 } 3524 3525 int 3526 pcap_setmode(pcap_t *p, int mode) 3527 { 3528 return (p->setmode_op(p, mode)); 3529 } 3530 3531 int 3532 pcap_setmintocopy(pcap_t *p, int size) 3533 { 3534 return (p->setmintocopy_op(p, size)); 3535 } 3536 3537 HANDLE 3538 pcap_getevent(pcap_t *p) 3539 { 3540 return (p->getevent_op(p)); 3541 } 3542 3543 int 3544 pcap_oid_get_request(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp) 3545 { 3546 return (p->oid_get_request_op(p, oid, data, lenp)); 3547 } 3548 3549 int 3550 pcap_oid_set_request(pcap_t *p, bpf_u_int32 oid, const void *data, size_t *lenp) 3551 { 3552 return (p->oid_set_request_op(p, oid, data, lenp)); 3553 } 3554 3555 pcap_send_queue * 3556 pcap_sendqueue_alloc(u_int memsize) 3557 { 3558 pcap_send_queue *tqueue; 3559 3560 /* Allocate the queue */ 3561 tqueue = (pcap_send_queue *)malloc(sizeof(pcap_send_queue)); 3562 if (tqueue == NULL){ 3563 return (NULL); 3564 } 3565 3566 /* Allocate the buffer */ 3567 tqueue->buffer = (char *)malloc(memsize); 3568 if (tqueue->buffer == NULL) { 3569 free(tqueue); 3570 return (NULL); 3571 } 3572 3573 tqueue->maxlen = memsize; 3574 tqueue->len = 0; 3575 3576 return (tqueue); 3577 } 3578 3579 void 3580 pcap_sendqueue_destroy(pcap_send_queue *queue) 3581 { 3582 free(queue->buffer); 3583 free(queue); 3584 } 3585 3586 int 3587 pcap_sendqueue_queue(pcap_send_queue *queue, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data) 3588 { 3589 if (queue->len + sizeof(struct pcap_pkthdr) + pkt_header->caplen > queue->maxlen){ 3590 return (-1); 3591 } 3592 3593 /* Copy the pcap_pkthdr header*/ 3594 memcpy(queue->buffer + queue->len, pkt_header, sizeof(struct pcap_pkthdr)); 3595 queue->len += sizeof(struct pcap_pkthdr); 3596 3597 /* copy the packet */ 3598 memcpy(queue->buffer + queue->len, pkt_data, pkt_header->caplen); 3599 queue->len += pkt_header->caplen; 3600 3601 return (0); 3602 } 3603 3604 u_int 3605 pcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync) 3606 { 3607 return (p->sendqueue_transmit_op(p, queue, sync)); 3608 } 3609 3610 int 3611 pcap_setuserbuffer(pcap_t *p, int size) 3612 { 3613 return (p->setuserbuffer_op(p, size)); 3614 } 3615 3616 int 3617 pcap_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks) 3618 { 3619 return (p->live_dump_op(p, filename, maxsize, maxpacks)); 3620 } 3621 3622 int 3623 pcap_live_dump_ended(pcap_t *p, int sync) 3624 { 3625 return (p->live_dump_ended_op(p, sync)); 3626 } 3627 3628 PAirpcapHandle 3629 pcap_get_airpcap_handle(pcap_t *p) 3630 { 3631 PAirpcapHandle handle; 3632 3633 handle = p->get_airpcap_handle_op(p); 3634 if (handle == NULL) { 3635 (void)pcap_snprintf(p->errbuf, sizeof(p->errbuf), 3636 "This isn't an AirPcap device"); 3637 } 3638 return (handle); 3639 } 3640 #endif 3641 3642 /* 3643 * On some platforms, we need to clean up promiscuous or monitor mode 3644 * when we close a device - and we want that to happen even if the 3645 * application just exits without explicitl closing devices. 3646 * On those platforms, we need to register a "close all the pcaps" 3647 * routine to be called when we exit, and need to maintain a list of 3648 * pcaps that need to be closed to clean up modes. 3649 * 3650 * XXX - not thread-safe. 3651 */ 3652 3653 /* 3654 * List of pcaps on which we've done something that needs to be 3655 * cleaned up. 3656 * If there are any such pcaps, we arrange to call "pcap_close_all()" 3657 * when we exit, and have it close all of them. 3658 */ 3659 static struct pcap *pcaps_to_close; 3660 3661 /* 3662 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to 3663 * be called on exit. 3664 */ 3665 static int did_atexit; 3666 3667 static void 3668 pcap_close_all(void) 3669 { 3670 struct pcap *handle; 3671 3672 while ((handle = pcaps_to_close) != NULL) 3673 pcap_close(handle); 3674 } 3675 3676 int 3677 pcap_do_addexit(pcap_t *p) 3678 { 3679 /* 3680 * If we haven't already done so, arrange to have 3681 * "pcap_close_all()" called when we exit. 3682 */ 3683 if (!did_atexit) { 3684 if (atexit(pcap_close_all) != 0) { 3685 /* 3686 * "atexit()" failed; let our caller know. 3687 */ 3688 pcap_strlcpy(p->errbuf, "atexit failed", PCAP_ERRBUF_SIZE); 3689 return (0); 3690 } 3691 did_atexit = 1; 3692 } 3693 return (1); 3694 } 3695 3696 void 3697 pcap_add_to_pcaps_to_close(pcap_t *p) 3698 { 3699 p->next = pcaps_to_close; 3700 pcaps_to_close = p; 3701 } 3702 3703 void 3704 pcap_remove_from_pcaps_to_close(pcap_t *p) 3705 { 3706 pcap_t *pc, *prevpc; 3707 3708 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL; 3709 prevpc = pc, pc = pc->next) { 3710 if (pc == p) { 3711 /* 3712 * Found it. Remove it from the list. 3713 */ 3714 if (prevpc == NULL) { 3715 /* 3716 * It was at the head of the list. 3717 */ 3718 pcaps_to_close = pc->next; 3719 } else { 3720 /* 3721 * It was in the middle of the list. 3722 */ 3723 prevpc->next = pc->next; 3724 } 3725 break; 3726 } 3727 } 3728 } 3729 3730 void 3731 pcap_cleanup_live_common(pcap_t *p) 3732 { 3733 if (p->buffer != NULL) { 3734 free(p->buffer); 3735 p->buffer = NULL; 3736 } 3737 if (p->dlt_list != NULL) { 3738 free(p->dlt_list); 3739 p->dlt_list = NULL; 3740 p->dlt_count = 0; 3741 } 3742 if (p->tstamp_type_list != NULL) { 3743 free(p->tstamp_type_list); 3744 p->tstamp_type_list = NULL; 3745 p->tstamp_type_count = 0; 3746 } 3747 if (p->tstamp_precision_list != NULL) { 3748 free(p->tstamp_precision_list); 3749 p->tstamp_precision_list = NULL; 3750 p->tstamp_precision_count = 0; 3751 } 3752 pcap_freecode(&p->fcode); 3753 #if !defined(_WIN32) && !defined(MSDOS) 3754 if (p->fd >= 0) { 3755 close(p->fd); 3756 p->fd = -1; 3757 } 3758 p->selectable_fd = -1; 3759 #endif 3760 } 3761 3762 /* 3763 * API compatible with WinPcap's "send a packet" routine - returns -1 3764 * on error, 0 otherwise. 3765 * 3766 * XXX - what if we get a short write? 3767 */ 3768 int 3769 pcap_sendpacket(pcap_t *p, const u_char *buf, int size) 3770 { 3771 if (p->inject_op(p, buf, size) == -1) 3772 return (-1); 3773 return (0); 3774 } 3775 3776 /* 3777 * API compatible with OpenBSD's "send a packet" routine - returns -1 on 3778 * error, number of bytes written otherwise. 3779 */ 3780 int 3781 pcap_inject(pcap_t *p, const void *buf, size_t size) 3782 { 3783 return (p->inject_op(p, buf, size)); 3784 } 3785 3786 void 3787 pcap_close(pcap_t *p) 3788 { 3789 if (p->opt.device != NULL) 3790 free(p->opt.device); 3791 p->cleanup_op(p); 3792 free(p); 3793 } 3794 3795 /* 3796 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw 3797 * data for the packet, check whether the packet passes the filter. 3798 * Returns the return value of the filter program, which will be zero if 3799 * the packet doesn't pass and non-zero if the packet does pass. 3800 */ 3801 int 3802 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h, 3803 const u_char *pkt) 3804 { 3805 const struct bpf_insn *fcode = fp->bf_insns; 3806 3807 if (fcode != NULL) 3808 return (bpf_filter(fcode, pkt, h->len, h->caplen)); 3809 else 3810 return (0); 3811 } 3812 3813 static int 3814 pcap_can_set_rfmon_dead(pcap_t *p) 3815 { 3816 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3817 "Rfmon mode doesn't apply on a pcap_open_dead pcap_t"); 3818 return (PCAP_ERROR); 3819 } 3820 3821 static int 3822 pcap_read_dead(pcap_t *p, int cnt _U_, pcap_handler callback _U_, 3823 u_char *user _U_) 3824 { 3825 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3826 "Packets aren't available from a pcap_open_dead pcap_t"); 3827 return (-1); 3828 } 3829 3830 static int 3831 pcap_inject_dead(pcap_t *p, const void *buf _U_, size_t size _U_) 3832 { 3833 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3834 "Packets can't be sent on a pcap_open_dead pcap_t"); 3835 return (-1); 3836 } 3837 3838 static int 3839 pcap_setfilter_dead(pcap_t *p, struct bpf_program *fp _U_) 3840 { 3841 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3842 "A filter cannot be set on a pcap_open_dead pcap_t"); 3843 return (-1); 3844 } 3845 3846 static int 3847 pcap_setdirection_dead(pcap_t *p, pcap_direction_t d _U_) 3848 { 3849 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3850 "The packet direction cannot be set on a pcap_open_dead pcap_t"); 3851 return (-1); 3852 } 3853 3854 static int 3855 pcap_set_datalink_dead(pcap_t *p, int dlt _U_) 3856 { 3857 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3858 "The link-layer header type cannot be set on a pcap_open_dead pcap_t"); 3859 return (-1); 3860 } 3861 3862 static int 3863 pcap_getnonblock_dead(pcap_t *p) 3864 { 3865 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3866 "A pcap_open_dead pcap_t does not have a non-blocking mode setting"); 3867 return (-1); 3868 } 3869 3870 static int 3871 pcap_setnonblock_dead(pcap_t *p, int nonblock _U_) 3872 { 3873 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3874 "A pcap_open_dead pcap_t does not have a non-blocking mode setting"); 3875 return (-1); 3876 } 3877 3878 static int 3879 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_) 3880 { 3881 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3882 "Statistics aren't available from a pcap_open_dead pcap_t"); 3883 return (-1); 3884 } 3885 3886 #ifdef _WIN32 3887 struct pcap_stat * 3888 pcap_stats_ex_dead(pcap_t *p, int *pcap_stat_size _U_) 3889 { 3890 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3891 "Statistics aren't available from a pcap_open_dead pcap_t"); 3892 return (NULL); 3893 } 3894 3895 static int 3896 pcap_setbuff_dead(pcap_t *p, int dim) 3897 { 3898 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3899 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t"); 3900 return (-1); 3901 } 3902 3903 static int 3904 pcap_setmode_dead(pcap_t *p, int mode) 3905 { 3906 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3907 "impossible to set mode on a pcap_open_dead pcap_t"); 3908 return (-1); 3909 } 3910 3911 static int 3912 pcap_setmintocopy_dead(pcap_t *p, int size) 3913 { 3914 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3915 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t"); 3916 return (-1); 3917 } 3918 3919 static HANDLE 3920 pcap_getevent_dead(pcap_t *p) 3921 { 3922 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3923 "A pcap_open_dead pcap_t has no event handle"); 3924 return (INVALID_HANDLE_VALUE); 3925 } 3926 3927 static int 3928 pcap_oid_get_request_dead(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_, 3929 size_t *lenp _U_) 3930 { 3931 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3932 "An OID get request cannot be performed on a pcap_open_dead pcap_t"); 3933 return (PCAP_ERROR); 3934 } 3935 3936 static int 3937 pcap_oid_set_request_dead(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_, 3938 size_t *lenp _U_) 3939 { 3940 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3941 "An OID set request cannot be performed on a pcap_open_dead pcap_t"); 3942 return (PCAP_ERROR); 3943 } 3944 3945 static u_int 3946 pcap_sendqueue_transmit_dead(pcap_t *p, pcap_send_queue *queue, int sync) 3947 { 3948 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3949 "Packets cannot be transmitted on a pcap_open_dead pcap_t"); 3950 return (0); 3951 } 3952 3953 static int 3954 pcap_setuserbuffer_dead(pcap_t *p, int size) 3955 { 3956 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3957 "The user buffer cannot be set on a pcap_open_dead pcap_t"); 3958 return (-1); 3959 } 3960 3961 static int 3962 pcap_live_dump_dead(pcap_t *p, char *filename, int maxsize, int maxpacks) 3963 { 3964 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3965 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t"); 3966 return (-1); 3967 } 3968 3969 static int 3970 pcap_live_dump_ended_dead(pcap_t *p, int sync) 3971 { 3972 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3973 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t"); 3974 return (-1); 3975 } 3976 3977 static PAirpcapHandle 3978 pcap_get_airpcap_handle_dead(pcap_t *p) 3979 { 3980 return (NULL); 3981 } 3982 #endif /* _WIN32 */ 3983 3984 static void 3985 pcap_cleanup_dead(pcap_t *p _U_) 3986 { 3987 /* Nothing to do. */ 3988 } 3989 3990 pcap_t * 3991 pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision) 3992 { 3993 pcap_t *p; 3994 3995 switch (precision) { 3996 3997 case PCAP_TSTAMP_PRECISION_MICRO: 3998 case PCAP_TSTAMP_PRECISION_NANO: 3999 break; 4000 4001 default: 4002 /* 4003 * This doesn't really matter, but we don't have any way 4004 * to report particular errors, so the only failure we 4005 * should have is a memory allocation failure. Just 4006 * pick microsecond precision. 4007 */ 4008 precision = PCAP_TSTAMP_PRECISION_MICRO; 4009 break; 4010 } 4011 p = malloc(sizeof(*p)); 4012 if (p == NULL) 4013 return NULL; 4014 memset (p, 0, sizeof(*p)); 4015 p->snapshot = snaplen; 4016 p->linktype = linktype; 4017 p->opt.tstamp_precision = precision; 4018 p->can_set_rfmon_op = pcap_can_set_rfmon_dead; 4019 p->read_op = pcap_read_dead; 4020 p->inject_op = pcap_inject_dead; 4021 p->setfilter_op = pcap_setfilter_dead; 4022 p->setdirection_op = pcap_setdirection_dead; 4023 p->set_datalink_op = pcap_set_datalink_dead; 4024 p->getnonblock_op = pcap_getnonblock_dead; 4025 p->setnonblock_op = pcap_setnonblock_dead; 4026 p->stats_op = pcap_stats_dead; 4027 #ifdef _WIN32 4028 p->stats_ex_op = pcap_stats_ex_dead; 4029 p->setbuff_op = pcap_setbuff_dead; 4030 p->setmode_op = pcap_setmode_dead; 4031 p->setmintocopy_op = pcap_setmintocopy_dead; 4032 p->getevent_op = pcap_getevent_dead; 4033 p->oid_get_request_op = pcap_oid_get_request_dead; 4034 p->oid_set_request_op = pcap_oid_set_request_dead; 4035 p->sendqueue_transmit_op = pcap_sendqueue_transmit_dead; 4036 p->setuserbuffer_op = pcap_setuserbuffer_dead; 4037 p->live_dump_op = pcap_live_dump_dead; 4038 p->live_dump_ended_op = pcap_live_dump_ended_dead; 4039 p->get_airpcap_handle_op = pcap_get_airpcap_handle_dead; 4040 #endif 4041 p->cleanup_op = pcap_cleanup_dead; 4042 4043 /* 4044 * A "dead" pcap_t never requires special BPF code generation. 4045 */ 4046 p->bpf_codegen_flags = 0; 4047 4048 p->activated = 1; 4049 return (p); 4050 } 4051 4052 pcap_t * 4053 pcap_open_dead(int linktype, int snaplen) 4054 { 4055 return (pcap_open_dead_with_tstamp_precision(linktype, snaplen, 4056 PCAP_TSTAMP_PRECISION_MICRO)); 4057 } 4058 4059 #ifdef YYDEBUG 4060 /* 4061 * Set the internal "debug printout" flag for the filter expression parser. 4062 * The code to print that stuff is present only if YYDEBUG is defined, so 4063 * the flag, and the routine to set it, are defined only if YYDEBUG is 4064 * defined. 4065 * 4066 * This is intended for libpcap developers, not for general use. 4067 * If you want to set these in a program, you'll have to declare this 4068 * routine yourself, with the appropriate DLL import attribute on Windows; 4069 * it's not declared in any header file, and won't be declared in any 4070 * header file provided by libpcap. 4071 */ 4072 PCAP_API void pcap_set_parser_debug(int value); 4073 4074 PCAP_API_DEF void 4075 pcap_set_parser_debug(int value) 4076 { 4077 pcap_debug = value; 4078 } 4079 #endif 4080