1 /* 2 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the Computer Systems 16 * Engineering Group at Lawrence Berkeley Laboratory. 17 * 4. Neither the name of the University nor of the Laboratory may be used 18 * to endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 #endif 37 38 #include <pcap-types.h> 39 #ifndef _WIN32 40 #include <sys/param.h> 41 #ifndef MSDOS 42 #include <sys/file.h> 43 #endif 44 #include <sys/ioctl.h> 45 #include <sys/socket.h> 46 #ifdef HAVE_SYS_SOCKIO_H 47 #include <sys/sockio.h> 48 #endif 49 50 struct mbuf; /* Squelch compiler warnings on some platforms for */ 51 struct rtentry; /* declarations in <net/if.h> */ 52 #include <net/if.h> 53 #include <netinet/in.h> 54 #endif /* _WIN32 */ 55 56 #include <ctype.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__) 61 #include <unistd.h> 62 #endif 63 #include <fcntl.h> 64 #include <errno.h> 65 #ifdef HAVE_LIMITS_H 66 #include <limits.h> 67 #else 68 #define INT_MAX 2147483647 69 #endif 70 71 #ifdef HAVE_OS_PROTO_H 72 #include "os-proto.h" 73 #endif 74 75 #ifdef MSDOS 76 #include "pcap-dos.h" 77 #endif 78 79 #include "pcap-int.h" 80 81 #include "optimize.h" 82 83 #ifdef HAVE_DAG_API 84 #include "pcap-dag.h" 85 #endif /* HAVE_DAG_API */ 86 87 #ifdef HAVE_SEPTEL_API 88 #include "pcap-septel.h" 89 #endif /* HAVE_SEPTEL_API */ 90 91 #ifdef HAVE_SNF_API 92 #include "pcap-snf.h" 93 #endif /* HAVE_SNF_API */ 94 95 #ifdef HAVE_TC_API 96 #include "pcap-tc.h" 97 #endif /* HAVE_TC_API */ 98 99 #ifdef PCAP_SUPPORT_USB 100 #include "pcap-usb-linux.h" 101 #endif 102 103 #ifdef PCAP_SUPPORT_BT 104 #include "pcap-bt-linux.h" 105 #endif 106 107 #ifdef PCAP_SUPPORT_BT_MONITOR 108 #include "pcap-bt-monitor-linux.h" 109 #endif 110 111 #ifdef PCAP_SUPPORT_NETFILTER 112 #include "pcap-netfilter-linux.h" 113 #endif 114 115 #ifdef PCAP_SUPPORT_NETMAP 116 #include "pcap-netmap.h" 117 #endif 118 119 #ifdef PCAP_SUPPORT_DBUS 120 #include "pcap-dbus.h" 121 #endif 122 123 #ifdef PCAP_SUPPORT_RDMASNIFF 124 #include "pcap-rdmasniff.h" 125 #endif 126 127 #ifdef _WIN32 128 /* 129 * DllMain(), required when built as a Windows DLL. 130 */ 131 BOOL WINAPI DllMain( 132 HANDLE hinstDLL, 133 DWORD dwReason, 134 LPVOID lpvReserved 135 ) 136 { 137 return (TRUE); 138 } 139 140 /* 141 * Start WinSock. 142 * Exported in case some applications using WinPcap/Npcap called it, 143 * even though it wasn't exported. 144 */ 145 int 146 wsockinit(void) 147 { 148 WORD wVersionRequested; 149 WSADATA wsaData; 150 static int err = -1; 151 static int done = 0; 152 153 if (done) 154 return (err); 155 156 wVersionRequested = MAKEWORD( 1, 1); 157 err = WSAStartup( wVersionRequested, &wsaData ); 158 atexit ((void(*)(void))WSACleanup); 159 done = 1; 160 161 if ( err != 0 ) 162 err = -1; 163 return (err); 164 } 165 166 /* 167 * This is the exported function; new programs should call this. 168 */ 169 int 170 pcap_wsockinit(void) 171 { 172 return (wsockinit()); 173 } 174 #endif /* _WIN32 */ 175 176 /* 177 * String containing the library version. 178 * Not explicitly exported via a header file - the right API to use 179 * is pcap_lib_version() - but some programs included it, so we 180 * provide it. 181 * 182 * We declare it here, right before defining it, to squelch any 183 * warnings we might get from compilers about the lack of a 184 * declaration. 185 */ 186 PCAP_API char pcap_version[]; 187 PCAP_API_DEF char pcap_version[] = PACKAGE_VERSION; 188 189 static void 190 pcap_set_not_initialized_message(pcap_t *pcap) 191 { 192 if (pcap->activated) { 193 /* A module probably forgot to set the function pointer */ 194 (void)pcap_snprintf(pcap->errbuf, sizeof(pcap->errbuf), 195 "This operation isn't properly handled by that device"); 196 return; 197 } 198 /* in case the caller doesn't check for PCAP_ERROR_NOT_ACTIVATED */ 199 (void)pcap_snprintf(pcap->errbuf, sizeof(pcap->errbuf), 200 "This handle hasn't been activated yet"); 201 } 202 203 static int 204 pcap_read_not_initialized(pcap_t *pcap, int cnt _U_, pcap_handler callback _U_, 205 u_char *user _U_) 206 { 207 pcap_set_not_initialized_message(pcap); 208 /* this means 'not initialized' */ 209 return (PCAP_ERROR_NOT_ACTIVATED); 210 } 211 212 static int 213 pcap_inject_not_initialized(pcap_t *pcap, const void * buf _U_, size_t size _U_) 214 { 215 pcap_set_not_initialized_message(pcap); 216 /* this means 'not initialized' */ 217 return (PCAP_ERROR_NOT_ACTIVATED); 218 } 219 220 static int 221 pcap_setfilter_not_initialized(pcap_t *pcap, struct bpf_program *fp _U_) 222 { 223 pcap_set_not_initialized_message(pcap); 224 /* this means 'not initialized' */ 225 return (PCAP_ERROR_NOT_ACTIVATED); 226 } 227 228 static int 229 pcap_setdirection_not_initialized(pcap_t *pcap, pcap_direction_t d _U_) 230 { 231 pcap_set_not_initialized_message(pcap); 232 /* this means 'not initialized' */ 233 return (PCAP_ERROR_NOT_ACTIVATED); 234 } 235 236 static int 237 pcap_set_datalink_not_initialized(pcap_t *pcap, int dlt _U_) 238 { 239 pcap_set_not_initialized_message(pcap); 240 /* this means 'not initialized' */ 241 return (PCAP_ERROR_NOT_ACTIVATED); 242 } 243 244 static int 245 pcap_getnonblock_not_initialized(pcap_t *pcap) 246 { 247 pcap_set_not_initialized_message(pcap); 248 /* this means 'not initialized' */ 249 return (PCAP_ERROR_NOT_ACTIVATED); 250 } 251 252 static int 253 pcap_stats_not_initialized(pcap_t *pcap, struct pcap_stat *ps _U_) 254 { 255 pcap_set_not_initialized_message(pcap); 256 /* this means 'not initialized' */ 257 return (PCAP_ERROR_NOT_ACTIVATED); 258 } 259 260 #ifdef _WIN32 261 struct pcap_stat * 262 pcap_stats_ex_not_initialized(pcap_t *pcap, int *pcap_stat_size _U_) 263 { 264 pcap_set_not_initialized_message(pcap); 265 return (NULL); 266 } 267 268 static int 269 pcap_setbuff_not_initialized(pcap_t *pcap, int dim _U_) 270 { 271 pcap_set_not_initialized_message(pcap); 272 /* this means 'not initialized' */ 273 return (PCAP_ERROR_NOT_ACTIVATED); 274 } 275 276 static int 277 pcap_setmode_not_initialized(pcap_t *pcap, int mode _U_) 278 { 279 pcap_set_not_initialized_message(pcap); 280 /* this means 'not initialized' */ 281 return (PCAP_ERROR_NOT_ACTIVATED); 282 } 283 284 static int 285 pcap_setmintocopy_not_initialized(pcap_t *pcap, int size _U_) 286 { 287 pcap_set_not_initialized_message(pcap); 288 /* this means 'not initialized' */ 289 return (PCAP_ERROR_NOT_ACTIVATED); 290 } 291 292 static HANDLE 293 pcap_getevent_not_initialized(pcap_t *pcap) 294 { 295 pcap_set_not_initialized_message(pcap); 296 return (INVALID_HANDLE_VALUE); 297 } 298 299 static int 300 pcap_oid_get_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_, 301 void *data _U_, size_t *lenp _U_) 302 { 303 pcap_set_not_initialized_message(pcap); 304 return (PCAP_ERROR_NOT_ACTIVATED); 305 } 306 307 static int 308 pcap_oid_set_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_, 309 const void *data _U_, size_t *lenp _U_) 310 { 311 pcap_set_not_initialized_message(pcap); 312 return (PCAP_ERROR_NOT_ACTIVATED); 313 } 314 315 static u_int 316 pcap_sendqueue_transmit_not_initialized(pcap_t *pcap, pcap_send_queue* queue, int sync) 317 { 318 pcap_set_not_initialized_message(pcap); 319 return (0); 320 } 321 322 static int 323 pcap_setuserbuffer_not_initialized(pcap_t *pcap, int size _U_) 324 { 325 pcap_set_not_initialized_message(pcap); 326 return (PCAP_ERROR_NOT_ACTIVATED); 327 } 328 329 static int 330 pcap_live_dump_not_initialized(pcap_t *pcap, char *filename _U_, int maxsize _U_, 331 int maxpacks _U_) 332 { 333 pcap_set_not_initialized_message(pcap); 334 return (PCAP_ERROR_NOT_ACTIVATED); 335 } 336 337 static int 338 pcap_live_dump_ended_not_initialized(pcap_t *pcap, int sync _U_) 339 { 340 pcap_set_not_initialized_message(pcap); 341 return (PCAP_ERROR_NOT_ACTIVATED); 342 } 343 344 static PAirpcapHandle 345 pcap_get_airpcap_handle_not_initialized(pcap_t *pcap) 346 { 347 pcap_set_not_initialized_message(pcap); 348 return (NULL); 349 } 350 #endif 351 352 /* 353 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't, 354 * a PCAP_ERROR value on an error. 355 */ 356 int 357 pcap_can_set_rfmon(pcap_t *p) 358 { 359 return (p->can_set_rfmon_op(p)); 360 } 361 362 /* 363 * For systems where rfmon mode is never supported. 364 */ 365 static int 366 pcap_cant_set_rfmon(pcap_t *p _U_) 367 { 368 return (0); 369 } 370 371 /* 372 * Sets *tstamp_typesp to point to an array 1 or more supported time stamp 373 * types; the return value is the number of supported time stamp types. 374 * The list should be freed by a call to pcap_free_tstamp_types() when 375 * you're done with it. 376 * 377 * A return value of 0 means "you don't get a choice of time stamp type", 378 * in which case *tstamp_typesp is set to null. 379 * 380 * PCAP_ERROR is returned on error. 381 */ 382 int 383 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp) 384 { 385 if (p->tstamp_type_count == 0) { 386 /* 387 * We don't support multiple time stamp types. 388 * That means the only type we support is PCAP_TSTAMP_HOST; 389 * set up a list containing only that type. 390 */ 391 *tstamp_typesp = (int*)malloc(sizeof(**tstamp_typesp)); 392 if (*tstamp_typesp == NULL) { 393 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 394 errno, "malloc"); 395 return (PCAP_ERROR); 396 } 397 **tstamp_typesp = PCAP_TSTAMP_HOST; 398 return (1); 399 } else { 400 *tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp), 401 p->tstamp_type_count); 402 if (*tstamp_typesp == NULL) { 403 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 404 errno, "malloc"); 405 return (PCAP_ERROR); 406 } 407 (void)memcpy(*tstamp_typesp, p->tstamp_type_list, 408 sizeof(**tstamp_typesp) * p->tstamp_type_count); 409 return (p->tstamp_type_count); 410 } 411 } 412 413 /* 414 * In Windows, you might have a library built with one version of the 415 * C runtime library and an application built with another version of 416 * the C runtime library, which means that the library might use one 417 * version of malloc() and free() and the application might use another 418 * version of malloc() and free(). If so, that means something 419 * allocated by the library cannot be freed by the application, so we 420 * need to have a pcap_free_tstamp_types() routine to free up the list 421 * allocated by pcap_list_tstamp_types(), even though it's just a wrapper 422 * around free(). 423 */ 424 void 425 pcap_free_tstamp_types(int *tstamp_type_list) 426 { 427 free(tstamp_type_list); 428 } 429 430 /* 431 * Default one-shot callback; overridden for capture types where the 432 * packet data cannot be guaranteed to be available after the callback 433 * returns, so that a copy must be made. 434 */ 435 void 436 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt) 437 { 438 struct oneshot_userdata *sp = (struct oneshot_userdata *)user; 439 440 *sp->hdr = *h; 441 *sp->pkt = pkt; 442 } 443 444 const u_char * 445 pcap_next(pcap_t *p, struct pcap_pkthdr *h) 446 { 447 struct oneshot_userdata s; 448 const u_char *pkt; 449 450 s.hdr = h; 451 s.pkt = &pkt; 452 s.pd = p; 453 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0) 454 return (0); 455 return (pkt); 456 } 457 458 int 459 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, 460 const u_char **pkt_data) 461 { 462 struct oneshot_userdata s; 463 464 s.hdr = &p->pcap_header; 465 s.pkt = pkt_data; 466 s.pd = p; 467 468 /* Saves a pointer to the packet headers */ 469 *pkt_header= &p->pcap_header; 470 471 if (p->rfile != NULL) { 472 int status; 473 474 /* We are on an offline capture */ 475 status = pcap_offline_read(p, 1, p->oneshot_callback, 476 (u_char *)&s); 477 478 /* 479 * Return codes for pcap_offline_read() are: 480 * - 0: EOF 481 * - -1: error 482 * - >1: OK 483 * The first one ('0') conflicts with the return code of 484 * 0 from pcap_read() meaning "no packets arrived before 485 * the timeout expired", so we map it to -2 so you can 486 * distinguish between an EOF from a savefile and a 487 * "no packets arrived before the timeout expired, try 488 * again" from a live capture. 489 */ 490 if (status == 0) 491 return (-2); 492 else 493 return (status); 494 } 495 496 /* 497 * Return codes for pcap_read() are: 498 * - 0: timeout 499 * - -1: error 500 * - -2: loop was broken out of with pcap_breakloop() 501 * - >1: OK 502 * The first one ('0') conflicts with the return code of 0 from 503 * pcap_offline_read() meaning "end of file". 504 */ 505 return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s)); 506 } 507 508 /* 509 * Implementation of a pcap_if_list_t. 510 */ 511 struct pcap_if_list { 512 pcap_if_t *beginning; 513 }; 514 515 static struct capture_source_type { 516 int (*findalldevs_op)(pcap_if_list_t *, char *); 517 pcap_t *(*create_op)(const char *, char *, int *); 518 } capture_source_types[] = { 519 #ifdef HAVE_DAG_API 520 { dag_findalldevs, dag_create }, 521 #endif 522 #ifdef HAVE_SEPTEL_API 523 { septel_findalldevs, septel_create }, 524 #endif 525 #ifdef HAVE_SNF_API 526 { snf_findalldevs, snf_create }, 527 #endif 528 #ifdef HAVE_TC_API 529 { TcFindAllDevs, TcCreate }, 530 #endif 531 #ifdef PCAP_SUPPORT_BT 532 { bt_findalldevs, bt_create }, 533 #endif 534 #ifdef PCAP_SUPPORT_BT_MONITOR 535 { bt_monitor_findalldevs, bt_monitor_create }, 536 #endif 537 #ifdef PCAP_SUPPORT_USB 538 { usb_findalldevs, usb_create }, 539 #endif 540 #ifdef PCAP_SUPPORT_NETFILTER 541 { netfilter_findalldevs, netfilter_create }, 542 #endif 543 #ifdef PCAP_SUPPORT_NETMAP 544 { pcap_netmap_findalldevs, pcap_netmap_create }, 545 #endif 546 #ifdef PCAP_SUPPORT_DBUS 547 { dbus_findalldevs, dbus_create }, 548 #endif 549 #ifdef PCAP_SUPPORT_RDMASNIFF 550 { rdmasniff_findalldevs, rdmasniff_create }, 551 #endif 552 { NULL, NULL } 553 }; 554 555 /* 556 * Get a list of all capture sources that are up and that we can open. 557 * Returns -1 on error, 0 otherwise. 558 * The list, as returned through "alldevsp", may be null if no interfaces 559 * were up and could be opened. 560 */ 561 int 562 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) 563 { 564 size_t i; 565 pcap_if_list_t devlist; 566 567 /* 568 * Find all the local network interfaces on which we 569 * can capture. 570 */ 571 devlist.beginning = NULL; 572 if (pcap_platform_finddevs(&devlist, errbuf) == -1) { 573 /* 574 * Failed - free all of the entries we were given 575 * before we failed. 576 */ 577 if (devlist.beginning != NULL) 578 pcap_freealldevs(devlist.beginning); 579 *alldevsp = NULL; 580 return (-1); 581 } 582 583 /* 584 * Ask each of the non-local-network-interface capture 585 * source types what interfaces they have. 586 */ 587 for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) { 588 if (capture_source_types[i].findalldevs_op(&devlist, errbuf) == -1) { 589 /* 590 * We had an error; free the list we've been 591 * constructing. 592 */ 593 if (devlist.beginning != NULL) 594 pcap_freealldevs(devlist.beginning); 595 *alldevsp = NULL; 596 return (-1); 597 } 598 } 599 600 /* 601 * Return the first entry of the list of all devices. 602 */ 603 *alldevsp = devlist.beginning; 604 return (0); 605 } 606 607 static struct sockaddr * 608 dup_sockaddr(struct sockaddr *sa, size_t sa_length) 609 { 610 struct sockaddr *newsa; 611 612 if ((newsa = malloc(sa_length)) == NULL) 613 return (NULL); 614 return (memcpy(newsa, sa, sa_length)); 615 } 616 617 /* 618 * Construct a "figure of merit" for an interface, for use when sorting 619 * the list of interfaces, in which interfaces that are up are superior 620 * to interfaces that aren't up, interfaces that are up and running are 621 * superior to interfaces that are up but not running, and non-loopback 622 * interfaces that are up and running are superior to loopback interfaces, 623 * and interfaces with the same flags have a figure of merit that's higher 624 * the lower the instance number. 625 * 626 * The goal is to try to put the interfaces most likely to be useful for 627 * capture at the beginning of the list. 628 * 629 * The figure of merit, which is lower the "better" the interface is, 630 * has the uppermost bit set if the interface isn't running, the bit 631 * below that set if the interface isn't up, the bit below that set 632 * if the interface is a loopback interface, and the interface index 633 * in the 29 bits below that. (Yes, we assume u_int is 32 bits.) 634 */ 635 static u_int 636 get_figure_of_merit(pcap_if_t *dev) 637 { 638 const char *cp; 639 u_int n; 640 641 if (strcmp(dev->name, "any") == 0) { 642 /* 643 * Give the "any" device an artificially high instance 644 * number, so it shows up after all other non-loopback 645 * interfaces. 646 */ 647 n = 0x1FFFFFFF; /* 29 all-1 bits */ 648 } else { 649 /* 650 * A number at the end of the device name string is 651 * assumed to be an instance number. Add 1 to the 652 * instance number, and use 0 for "no instance 653 * number", so we don't put "no instance number" 654 * devices and "instance 0" devices together. 655 */ 656 cp = dev->name + strlen(dev->name) - 1; 657 while (cp-1 >= dev->name && *(cp-1) >= '0' && *(cp-1) <= '9') 658 cp--; 659 if (*cp >= '0' && *cp <= '9') 660 n = atoi(cp) + 1; 661 else 662 n = 0; 663 } 664 if (!(dev->flags & PCAP_IF_RUNNING)) 665 n |= 0x80000000; 666 if (!(dev->flags & PCAP_IF_UP)) 667 n |= 0x40000000; 668 669 /* 670 * Give non-wireless interfaces that aren't disconnected a better 671 * figure of merit than interfaces that are disconnected, as 672 * "disconnected" should indicate that the interface isn't 673 * plugged into a network and thus won't give you any traffic. 674 * 675 * For wireless interfaces, it means "associated with a network", 676 * which we presume not to necessarily prevent capture, as you 677 * might run the adapter in some flavor of monitor mode. 678 */ 679 if (!(dev->flags & PCAP_IF_WIRELESS) && 680 (dev->flags & PCAP_IF_CONNECTION_STATUS) == PCAP_IF_CONNECTION_STATUS_DISCONNECTED) 681 n |= 0x20000000; 682 683 /* 684 * Sort loopback devices after non-loopback devices, *except* for 685 * disconnected devices. 686 */ 687 if (dev->flags & PCAP_IF_LOOPBACK) 688 n |= 0x10000000; 689 690 return (n); 691 } 692 693 #ifndef _WIN32 694 /* 695 * Try to get a description for a given device. 696 * Returns a mallocated description if it could and NULL if it couldn't. 697 * 698 * XXX - on FreeBSDs that support it, should it get the sysctl named 699 * "dev.{adapter family name}.{adapter unit}.%desc" to get a description 700 * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800" 701 * with my Cisco 350 card, so the name isn't entirely descriptive. The 702 * "dev.an.0.%pnpinfo" has a better description, although one might argue 703 * that the problem is really a driver bug - if it can find out that it's 704 * a Cisco 340 or 350, rather than an old Aironet card, it should use 705 * that in the description. 706 * 707 * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD 708 * and OpenBSD let you get a description, but it's not generated by the OS, 709 * it's set with another ioctl that ifconfig supports; we use that to get 710 * a description in FreeBSD and OpenBSD, but if there is no such 711 * description available, it still might be nice to get some description 712 * string based on the device type or something such as that. 713 * 714 * In macOS, the System Configuration framework can apparently return 715 * names in 10.4 and later. 716 * 717 * It also appears that freedesktop.org's HAL offers an "info.product" 718 * string, but the HAL specification says it "should not be used in any 719 * UI" and "subsystem/capability specific properties" should be used 720 * instead and, in any case, I think HAL is being deprecated in 721 * favor of other stuff such as DeviceKit. DeviceKit doesn't appear 722 * to have any obvious product information for devices, but maybe 723 * I haven't looked hard enough. 724 * 725 * Using the System Configuration framework, or HAL, or DeviceKit, or 726 * whatever, would require that libpcap applications be linked with 727 * the frameworks/libraries in question. That shouldn't be a problem 728 * for programs linking with the shared version of libpcap (unless 729 * you're running on AIX - which I think is the only UN*X that doesn't 730 * support linking a shared library with other libraries on which it 731 * depends, and having an executable linked only with the first shared 732 * library automatically pick up the other libraries when started - 733 * and using HAL or whatever). Programs linked with the static 734 * version of libpcap would have to use pcap-config with the --static 735 * flag in order to get the right linker flags in order to pick up 736 * the additional libraries/frameworks; those programs need that anyway 737 * for libpcap 1.1 and beyond on Linux, as, by default, it requires 738 * -lnl. 739 * 740 * Do any other UN*Xes, or desktop environments support getting a 741 * description? 742 */ 743 static char * 744 #ifdef SIOCGIFDESCR 745 get_if_description(const char *name) 746 { 747 char *description = NULL; 748 int s; 749 struct ifreq ifrdesc; 750 #ifndef IFDESCRSIZE 751 size_t descrlen = 64; 752 #else 753 size_t descrlen = IFDESCRSIZE; 754 #endif /* IFDESCRSIZE */ 755 756 /* 757 * Get the description for the interface. 758 */ 759 memset(&ifrdesc, 0, sizeof ifrdesc); 760 pcap_strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name); 761 s = socket(AF_INET, SOCK_DGRAM, 0); 762 if (s >= 0) { 763 #ifdef __FreeBSD__ 764 /* 765 * On FreeBSD, if the buffer isn't big enough for the 766 * description, the ioctl succeeds, but the description 767 * isn't copied, ifr_buffer.length is set to the description 768 * length, and ifr_buffer.buffer is set to NULL. 769 */ 770 for (;;) { 771 free(description); 772 if ((description = malloc(descrlen)) != NULL) { 773 ifrdesc.ifr_buffer.buffer = description; 774 ifrdesc.ifr_buffer.length = descrlen; 775 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) { 776 if (ifrdesc.ifr_buffer.buffer == 777 description) 778 break; 779 else 780 descrlen = ifrdesc.ifr_buffer.length; 781 } else { 782 /* 783 * Failed to get interface description. 784 */ 785 free(description); 786 description = NULL; 787 break; 788 } 789 } else 790 break; 791 } 792 #else /* __FreeBSD__ */ 793 /* 794 * The only other OS that currently supports 795 * SIOCGIFDESCR is OpenBSD, and it has no way 796 * to get the description length - it's clamped 797 * to a maximum of IFDESCRSIZE. 798 */ 799 if ((description = malloc(descrlen)) != NULL) { 800 ifrdesc.ifr_data = (caddr_t)description; 801 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) { 802 /* 803 * Failed to get interface description. 804 */ 805 free(description); 806 description = NULL; 807 } 808 } 809 #endif /* __FreeBSD__ */ 810 close(s); 811 if (description != NULL && description[0] == '\0') { 812 /* 813 * Description is empty, so discard it. 814 */ 815 free(description); 816 description = NULL; 817 } 818 } 819 820 #ifdef __FreeBSD__ 821 /* 822 * For FreeBSD, if we didn't get a description, and this is 823 * a device with a name of the form usbusN, label it as a USB 824 * bus. 825 */ 826 if (description == NULL) { 827 if (strncmp(name, "usbus", 5) == 0) { 828 /* 829 * OK, it begins with "usbus". 830 */ 831 long busnum; 832 char *p; 833 834 errno = 0; 835 busnum = strtol(name + 5, &p, 10); 836 if (errno == 0 && p != name + 5 && *p == '\0' && 837 busnum >= 0 && busnum <= INT_MAX) { 838 /* 839 * OK, it's a valid number that's not 840 * bigger than INT_MAX. Construct 841 * a description from it. 842 * (If that fails, we don't worry about 843 * it, we just return NULL.) 844 */ 845 if (pcap_asprintf(&description, 846 "USB bus number %ld", busnum) == -1) { 847 /* Failed. */ 848 description = NULL; 849 } 850 } 851 } 852 } 853 #endif 854 return (description); 855 #else /* SIOCGIFDESCR */ 856 get_if_description(const char *name _U_) 857 { 858 return (NULL); 859 #endif /* SIOCGIFDESCR */ 860 } 861 862 /* 863 * Look for a given device in the specified list of devices. 864 * 865 * If we find it, return a pointer to its entry. 866 * 867 * If we don't find it, attempt to add an entry for it, with the specified 868 * IFF_ flags and description, and, if that succeeds, return a pointer to 869 * the new entry, otherwise return NULL and set errbuf to an error message. 870 */ 871 pcap_if_t * 872 find_or_add_if(pcap_if_list_t *devlistp, const char *name, 873 bpf_u_int32 if_flags, get_if_flags_func get_flags_func, char *errbuf) 874 { 875 bpf_u_int32 pcap_flags; 876 877 /* 878 * Convert IFF_ flags to pcap flags. 879 */ 880 pcap_flags = 0; 881 #ifdef IFF_LOOPBACK 882 if (if_flags & IFF_LOOPBACK) 883 pcap_flags |= PCAP_IF_LOOPBACK; 884 #else 885 /* 886 * We don't have IFF_LOOPBACK, so look at the device name to 887 * see if it looks like a loopback device. 888 */ 889 if (name[0] == 'l' && name[1] == 'o' && 890 (isdigit((unsigned char)(name[2])) || name[2] == '\0') 891 pcap_flags |= PCAP_IF_LOOPBACK; 892 #endif 893 #ifdef IFF_UP 894 if (if_flags & IFF_UP) 895 pcap_flags |= PCAP_IF_UP; 896 #endif 897 #ifdef IFF_RUNNING 898 if (if_flags & IFF_RUNNING) 899 pcap_flags |= PCAP_IF_RUNNING; 900 #endif 901 902 /* 903 * Attempt to find an entry for this device; if we don't find one, 904 * attempt to add one. 905 */ 906 return (find_or_add_dev(devlistp, name, pcap_flags, 907 get_flags_func, get_if_description(name), errbuf)); 908 } 909 910 /* 911 * Look for a given device in the specified list of devices. 912 * 913 * If we find it, then, if the specified address isn't null, add it to 914 * the list of addresses for the device and return 0. 915 * 916 * If we don't find it, attempt to add an entry for it, with the specified 917 * IFF_ flags and description, and, if that succeeds, add the specified 918 * address to its list of addresses if that address is non-null, and 919 * return 0, otherwise return -1 and set errbuf to an error message. 920 * 921 * (We can get called with a null address because we might get a list 922 * of interface name/address combinations from the underlying OS, with 923 * the address being absent in some cases, rather than a list of 924 * interfaces with each interface having a list of addresses, so this 925 * call may be the only call made to add to the list, and we want to 926 * add interfaces even if they have no addresses.) 927 */ 928 int 929 add_addr_to_if(pcap_if_list_t *devlistp, const char *name, 930 bpf_u_int32 if_flags, get_if_flags_func get_flags_func, 931 struct sockaddr *addr, size_t addr_size, 932 struct sockaddr *netmask, size_t netmask_size, 933 struct sockaddr *broadaddr, size_t broadaddr_size, 934 struct sockaddr *dstaddr, size_t dstaddr_size, 935 char *errbuf) 936 { 937 pcap_if_t *curdev; 938 939 /* 940 * Check whether the device exists and, if not, add it. 941 */ 942 curdev = find_or_add_if(devlistp, name, if_flags, get_flags_func, 943 errbuf); 944 if (curdev == NULL) { 945 /* 946 * Error - give up. 947 */ 948 return (-1); 949 } 950 951 if (addr == NULL) { 952 /* 953 * There's no address to add; this entry just meant 954 * "here's a new interface". 955 */ 956 return (0); 957 } 958 959 /* 960 * "curdev" is an entry for this interface, and we have an 961 * address for it; add an entry for that address to the 962 * interface's list of addresses. 963 */ 964 return (add_addr_to_dev(curdev, addr, addr_size, netmask, 965 netmask_size, broadaddr, broadaddr_size, dstaddr, 966 dstaddr_size, errbuf)); 967 } 968 #endif /* _WIN32 */ 969 970 /* 971 * Add an entry to the list of addresses for an interface. 972 * "curdev" is the entry for that interface. 973 */ 974 int 975 add_addr_to_dev(pcap_if_t *curdev, 976 struct sockaddr *addr, size_t addr_size, 977 struct sockaddr *netmask, size_t netmask_size, 978 struct sockaddr *broadaddr, size_t broadaddr_size, 979 struct sockaddr *dstaddr, size_t dstaddr_size, 980 char *errbuf) 981 { 982 pcap_addr_t *curaddr, *prevaddr, *nextaddr; 983 984 /* 985 * Allocate the new entry and fill it in. 986 */ 987 curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t)); 988 if (curaddr == NULL) { 989 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 990 errno, "malloc"); 991 return (-1); 992 } 993 994 curaddr->next = NULL; 995 if (addr != NULL && addr_size != 0) { 996 curaddr->addr = (struct sockaddr *)dup_sockaddr(addr, addr_size); 997 if (curaddr->addr == NULL) { 998 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 999 errno, "malloc"); 1000 free(curaddr); 1001 return (-1); 1002 } 1003 } else 1004 curaddr->addr = NULL; 1005 1006 if (netmask != NULL && netmask_size != 0) { 1007 curaddr->netmask = (struct sockaddr *)dup_sockaddr(netmask, netmask_size); 1008 if (curaddr->netmask == NULL) { 1009 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1010 errno, "malloc"); 1011 if (curaddr->addr != NULL) 1012 free(curaddr->addr); 1013 free(curaddr); 1014 return (-1); 1015 } 1016 } else 1017 curaddr->netmask = NULL; 1018 1019 if (broadaddr != NULL && broadaddr_size != 0) { 1020 curaddr->broadaddr = (struct sockaddr *)dup_sockaddr(broadaddr, broadaddr_size); 1021 if (curaddr->broadaddr == NULL) { 1022 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1023 errno, "malloc"); 1024 if (curaddr->netmask != NULL) 1025 free(curaddr->netmask); 1026 if (curaddr->addr != NULL) 1027 free(curaddr->addr); 1028 free(curaddr); 1029 return (-1); 1030 } 1031 } else 1032 curaddr->broadaddr = NULL; 1033 1034 if (dstaddr != NULL && dstaddr_size != 0) { 1035 curaddr->dstaddr = (struct sockaddr *)dup_sockaddr(dstaddr, dstaddr_size); 1036 if (curaddr->dstaddr == NULL) { 1037 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1038 errno, "malloc"); 1039 if (curaddr->broadaddr != NULL) 1040 free(curaddr->broadaddr); 1041 if (curaddr->netmask != NULL) 1042 free(curaddr->netmask); 1043 if (curaddr->addr != NULL) 1044 free(curaddr->addr); 1045 free(curaddr); 1046 return (-1); 1047 } 1048 } else 1049 curaddr->dstaddr = NULL; 1050 1051 /* 1052 * Find the end of the list of addresses. 1053 */ 1054 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) { 1055 nextaddr = prevaddr->next; 1056 if (nextaddr == NULL) { 1057 /* 1058 * This is the end of the list. 1059 */ 1060 break; 1061 } 1062 } 1063 1064 if (prevaddr == NULL) { 1065 /* 1066 * The list was empty; this is the first member. 1067 */ 1068 curdev->addresses = curaddr; 1069 } else { 1070 /* 1071 * "prevaddr" is the last member of the list; append 1072 * this member to it. 1073 */ 1074 prevaddr->next = curaddr; 1075 } 1076 1077 return (0); 1078 } 1079 1080 /* 1081 * Look for a given device in the specified list of devices. 1082 * 1083 * If we find it, return 0 and set *curdev_ret to point to it. 1084 * 1085 * If we don't find it, attempt to add an entry for it, with the specified 1086 * flags and description, and, if that succeeds, return 0, otherwise 1087 * return -1 and set errbuf to an error message. 1088 */ 1089 pcap_if_t * 1090 find_or_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags, 1091 get_if_flags_func get_flags_func, const char *description, char *errbuf) 1092 { 1093 pcap_if_t *curdev; 1094 1095 /* 1096 * Is there already an entry in the list for this device? 1097 */ 1098 curdev = find_dev(devlistp, name); 1099 if (curdev != NULL) { 1100 /* 1101 * Yes, return it. 1102 */ 1103 return (curdev); 1104 } 1105 1106 /* 1107 * No, we didn't find it. 1108 */ 1109 1110 /* 1111 * Try to get additional flags for the device. 1112 */ 1113 if ((*get_flags_func)(name, &flags, errbuf) == -1) { 1114 /* 1115 * Failed. 1116 */ 1117 return (NULL); 1118 } 1119 1120 /* 1121 * Now, try to add it to the list of devices. 1122 */ 1123 return (add_dev(devlistp, name, flags, description, errbuf)); 1124 } 1125 1126 /* 1127 * Look for a given device in the specified list of devices, and return 1128 * the entry for it if we find it or NULL if we don't. 1129 */ 1130 pcap_if_t * 1131 find_dev(pcap_if_list_t *devlistp, const char *name) 1132 { 1133 pcap_if_t *curdev; 1134 1135 /* 1136 * Is there an entry in the list for this device? 1137 */ 1138 for (curdev = devlistp->beginning; curdev != NULL; 1139 curdev = curdev->next) { 1140 if (strcmp(name, curdev->name) == 0) { 1141 /* 1142 * We found it, so, yes, there is. No need to 1143 * add it. Provide the entry we found to our 1144 * caller. 1145 */ 1146 return (curdev); 1147 } 1148 } 1149 1150 /* 1151 * No. 1152 */ 1153 return (NULL); 1154 } 1155 1156 /* 1157 * Attempt to add an entry for a device, with the specified flags 1158 * and description, and, if that succeeds, return 0 and return a pointer 1159 * to the new entry, otherwise return NULL and set errbuf to an error 1160 * message. 1161 * 1162 * If we weren't given a description, try to get one. 1163 */ 1164 pcap_if_t * 1165 add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags, 1166 const char *description, char *errbuf) 1167 { 1168 pcap_if_t *curdev, *prevdev, *nextdev; 1169 u_int this_figure_of_merit, nextdev_figure_of_merit; 1170 1171 curdev = malloc(sizeof(pcap_if_t)); 1172 if (curdev == NULL) { 1173 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1174 errno, "malloc"); 1175 return (NULL); 1176 } 1177 1178 /* 1179 * Fill in the entry. 1180 */ 1181 curdev->next = NULL; 1182 curdev->name = strdup(name); 1183 if (curdev->name == NULL) { 1184 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1185 errno, "malloc"); 1186 free(curdev); 1187 return (NULL); 1188 } 1189 if (description == NULL) { 1190 /* 1191 * We weren't handed a description for the interface. 1192 */ 1193 curdev->description = NULL; 1194 } else { 1195 /* 1196 * We were handed a description; make a copy. 1197 */ 1198 curdev->description = strdup(description); 1199 if (curdev->description == NULL) { 1200 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1201 errno, "malloc"); 1202 free(curdev->name); 1203 free(curdev); 1204 return (NULL); 1205 } 1206 } 1207 curdev->addresses = NULL; /* list starts out as empty */ 1208 curdev->flags = flags; 1209 1210 /* 1211 * Add it to the list, in the appropriate location. 1212 * First, get the "figure of merit" for this interface. 1213 */ 1214 this_figure_of_merit = get_figure_of_merit(curdev); 1215 1216 /* 1217 * Now look for the last interface with an figure of merit 1218 * less than or equal to the new interface's figure of merit. 1219 * 1220 * We start with "prevdev" being NULL, meaning we're before 1221 * the first element in the list. 1222 */ 1223 prevdev = NULL; 1224 for (;;) { 1225 /* 1226 * Get the interface after this one. 1227 */ 1228 if (prevdev == NULL) { 1229 /* 1230 * The next element is the first element. 1231 */ 1232 nextdev = devlistp->beginning; 1233 } else 1234 nextdev = prevdev->next; 1235 1236 /* 1237 * Are we at the end of the list? 1238 */ 1239 if (nextdev == NULL) { 1240 /* 1241 * Yes - we have to put the new entry after "prevdev". 1242 */ 1243 break; 1244 } 1245 1246 /* 1247 * Is the new interface's figure of merit less 1248 * than the next interface's figure of merit, 1249 * meaning that the new interface is better 1250 * than the next interface? 1251 */ 1252 nextdev_figure_of_merit = get_figure_of_merit(nextdev); 1253 if (this_figure_of_merit < nextdev_figure_of_merit) { 1254 /* 1255 * Yes - we should put the new entry 1256 * before "nextdev", i.e. after "prevdev". 1257 */ 1258 break; 1259 } 1260 1261 prevdev = nextdev; 1262 } 1263 1264 /* 1265 * Insert before "nextdev". 1266 */ 1267 curdev->next = nextdev; 1268 1269 /* 1270 * Insert after "prevdev" - unless "prevdev" is null, 1271 * in which case this is the first interface. 1272 */ 1273 if (prevdev == NULL) { 1274 /* 1275 * This is the first interface. Make it 1276 * the first element in the list of devices. 1277 */ 1278 devlistp->beginning = curdev; 1279 } else 1280 prevdev->next = curdev; 1281 return (curdev); 1282 } 1283 1284 /* 1285 * Free a list of interfaces. 1286 */ 1287 void 1288 pcap_freealldevs(pcap_if_t *alldevs) 1289 { 1290 pcap_if_t *curdev, *nextdev; 1291 pcap_addr_t *curaddr, *nextaddr; 1292 1293 for (curdev = alldevs; curdev != NULL; curdev = nextdev) { 1294 nextdev = curdev->next; 1295 1296 /* 1297 * Free all addresses. 1298 */ 1299 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) { 1300 nextaddr = curaddr->next; 1301 if (curaddr->addr) 1302 free(curaddr->addr); 1303 if (curaddr->netmask) 1304 free(curaddr->netmask); 1305 if (curaddr->broadaddr) 1306 free(curaddr->broadaddr); 1307 if (curaddr->dstaddr) 1308 free(curaddr->dstaddr); 1309 free(curaddr); 1310 } 1311 1312 /* 1313 * Free the name string. 1314 */ 1315 free(curdev->name); 1316 1317 /* 1318 * Free the description string, if any. 1319 */ 1320 if (curdev->description != NULL) 1321 free(curdev->description); 1322 1323 /* 1324 * Free the interface. 1325 */ 1326 free(curdev); 1327 } 1328 } 1329 1330 /* 1331 * pcap-npf.c has its own pcap_lookupdev(), for compatibility reasons, as 1332 * it actually returns the names of all interfaces, with a NUL separator 1333 * between them; some callers may depend on that. 1334 * 1335 * MS-DOS has its own pcap_lookupdev(), but that might be useful only 1336 * as an optimization. 1337 * 1338 * In all other cases, we just use pcap_findalldevs() to get a list of 1339 * devices, and pick from that list. 1340 */ 1341 #if !defined(HAVE_PACKET32) && !defined(MSDOS) 1342 /* 1343 * Return the name of a network interface attached to the system, or NULL 1344 * if none can be found. The interface must be configured up; the 1345 * lowest unit number is preferred; loopback is ignored. 1346 */ 1347 char * 1348 pcap_lookupdev(char *errbuf) 1349 { 1350 pcap_if_t *alldevs; 1351 #ifdef _WIN32 1352 /* 1353 * Windows - use the same size as the old WinPcap 3.1 code. 1354 * XXX - this is probably bigger than it needs to be. 1355 */ 1356 #define IF_NAMESIZE 8192 1357 #else 1358 /* 1359 * UN*X - use the system's interface name size. 1360 * XXX - that might not be large enough for capture devices 1361 * that aren't regular network interfaces. 1362 */ 1363 /* for old BSD systems, including bsdi3 */ 1364 #ifndef IF_NAMESIZE 1365 #define IF_NAMESIZE IFNAMSIZ 1366 #endif 1367 #endif 1368 static char device[IF_NAMESIZE + 1]; 1369 char *ret; 1370 1371 if (pcap_findalldevs(&alldevs, errbuf) == -1) 1372 return (NULL); 1373 1374 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) { 1375 /* 1376 * There are no devices on the list, or the first device 1377 * on the list is a loopback device, which means there 1378 * are no non-loopback devices on the list. This means 1379 * we can't return any device. 1380 * 1381 * XXX - why not return a loopback device? If we can't 1382 * capture on it, it won't be on the list, and if it's 1383 * on the list, there aren't any non-loopback devices, 1384 * so why not just supply it as the default device? 1385 */ 1386 (void)pcap_strlcpy(errbuf, "no suitable device found", 1387 PCAP_ERRBUF_SIZE); 1388 ret = NULL; 1389 } else { 1390 /* 1391 * Return the name of the first device on the list. 1392 */ 1393 (void)pcap_strlcpy(device, alldevs->name, sizeof(device)); 1394 ret = device; 1395 } 1396 1397 pcap_freealldevs(alldevs); 1398 return (ret); 1399 } 1400 #endif /* !defined(HAVE_PACKET32) && !defined(MSDOS) */ 1401 1402 #if !defined(_WIN32) && !defined(MSDOS) 1403 /* 1404 * We don't just fetch the entire list of devices, search for the 1405 * particular device, and use its first IPv4 address, as that's too 1406 * much work to get just one device's netmask. 1407 * 1408 * If we had an API to get attributes for a given device, we could 1409 * use that. 1410 */ 1411 int 1412 pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp, 1413 char *errbuf) 1414 { 1415 register int fd; 1416 register struct sockaddr_in *sin4; 1417 struct ifreq ifr; 1418 1419 /* 1420 * The pseudo-device "any" listens on all interfaces and therefore 1421 * has the network address and -mask "0.0.0.0" therefore catching 1422 * all traffic. Using NULL for the interface is the same as "any". 1423 */ 1424 if (!device || strcmp(device, "any") == 0 1425 #ifdef HAVE_DAG_API 1426 || strstr(device, "dag") != NULL 1427 #endif 1428 #ifdef HAVE_SEPTEL_API 1429 || strstr(device, "septel") != NULL 1430 #endif 1431 #ifdef PCAP_SUPPORT_BT 1432 || strstr(device, "bluetooth") != NULL 1433 #endif 1434 #ifdef PCAP_SUPPORT_USB 1435 || strstr(device, "usbmon") != NULL 1436 #endif 1437 #ifdef HAVE_SNF_API 1438 || strstr(device, "snf") != NULL 1439 #endif 1440 #ifdef PCAP_SUPPORT_NETMAP 1441 || strncmp(device, "netmap:", 7) == 0 1442 || strncmp(device, "vale", 4) == 0 1443 #endif 1444 ) { 1445 *netp = *maskp = 0; 1446 return 0; 1447 } 1448 1449 fd = socket(AF_INET, SOCK_DGRAM, 0); 1450 if (fd < 0) { 1451 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1452 errno, "socket"); 1453 return (-1); 1454 } 1455 memset(&ifr, 0, sizeof(ifr)); 1456 #ifdef linux 1457 /* XXX Work around Linux kernel bug */ 1458 ifr.ifr_addr.sa_family = AF_INET; 1459 #endif 1460 (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 1461 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { 1462 if (errno == EADDRNOTAVAIL) { 1463 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1464 "%s: no IPv4 address assigned", device); 1465 } else { 1466 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1467 errno, "SIOCGIFADDR: %s", device); 1468 } 1469 (void)close(fd); 1470 return (-1); 1471 } 1472 sin4 = (struct sockaddr_in *)&ifr.ifr_addr; 1473 *netp = sin4->sin_addr.s_addr; 1474 memset(&ifr, 0, sizeof(ifr)); 1475 #ifdef linux 1476 /* XXX Work around Linux kernel bug */ 1477 ifr.ifr_addr.sa_family = AF_INET; 1478 #endif 1479 (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 1480 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) { 1481 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 1482 errno, "SIOCGIFNETMASK: %s", device); 1483 (void)close(fd); 1484 return (-1); 1485 } 1486 (void)close(fd); 1487 *maskp = sin4->sin_addr.s_addr; 1488 if (*maskp == 0) { 1489 if (IN_CLASSA(*netp)) 1490 *maskp = IN_CLASSA_NET; 1491 else if (IN_CLASSB(*netp)) 1492 *maskp = IN_CLASSB_NET; 1493 else if (IN_CLASSC(*netp)) 1494 *maskp = IN_CLASSC_NET; 1495 else { 1496 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1497 "inet class for 0x%x unknown", *netp); 1498 return (-1); 1499 } 1500 } 1501 *netp &= *maskp; 1502 return (0); 1503 } 1504 #endif /* !defined(_WIN32) && !defined(MSDOS) */ 1505 1506 #ifdef ENABLE_REMOTE 1507 #include "pcap-rpcap.h" 1508 1509 /* 1510 * Extract a substring from a string. 1511 */ 1512 static char * 1513 get_substring(const char *p, size_t len, char *ebuf) 1514 { 1515 char *token; 1516 1517 token = malloc(len + 1); 1518 if (token == NULL) { 1519 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1520 errno, "malloc"); 1521 return (NULL); 1522 } 1523 memcpy(token, p, len); 1524 token[len] = '\0'; 1525 return (token); 1526 } 1527 1528 /* 1529 * Parse a capture source that might be a URL. 1530 * 1531 * If the source is not a URL, *schemep, *userinfop, *hostp, and *portp 1532 * are set to NULL, *pathp is set to point to the source, and 0 is 1533 * returned. 1534 * 1535 * If source is a URL, and the URL refers to a local device (a special 1536 * case of rpcap:), *schemep, *userinfop, *hostp, and *portp are set 1537 * to NULL, *pathp is set to point to the device name, and 0 is returned. 1538 * 1539 * If source is a URL, and it's not a special case that refers to a local 1540 * device, and the parse succeeds: 1541 * 1542 * *schemep is set to point to an allocated string containing the scheme; 1543 * 1544 * if user information is present in the URL, *userinfop is set to point 1545 * to an allocated string containing the user information, otherwise 1546 * it's set to NULL; 1547 * 1548 * if host information is present in the URL, *hostp is set to point 1549 * to an allocated string containing the host information, otherwise 1550 * it's set to NULL; 1551 * 1552 * if a port number is present in the URL, *portp is set to point 1553 * to an allocated string containing the port number, otherwise 1554 * it's set to NULL; 1555 * 1556 * *pathp is set to point to an allocated string containing the 1557 * path; 1558 * 1559 * and 0 is returned. 1560 * 1561 * If the parse fails, ebuf is set to an error string, and -1 is returned. 1562 */ 1563 static int 1564 pcap_parse_source(const char *source, char **schemep, char **userinfop, 1565 char **hostp, char **portp, char **pathp, char *ebuf) 1566 { 1567 char *colonp; 1568 size_t scheme_len; 1569 char *scheme; 1570 const char *endp; 1571 size_t authority_len; 1572 char *authority; 1573 char *parsep, *atsignp, *bracketp; 1574 char *userinfo, *host, *port, *path; 1575 1576 /* 1577 * Start out returning nothing. 1578 */ 1579 *schemep = NULL; 1580 *userinfop = NULL; 1581 *hostp = NULL; 1582 *portp = NULL; 1583 *pathp = NULL; 1584 1585 /* 1586 * RFC 3986 says: 1587 * 1588 * URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] 1589 * 1590 * hier-part = "//" authority path-abempty 1591 * / path-absolute 1592 * / path-rootless 1593 * / path-empty 1594 * 1595 * authority = [ userinfo "@" ] host [ ":" port ] 1596 * 1597 * userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) 1598 * 1599 * Step 1: look for the ":" at the end of the scheme. 1600 * A colon in the source is *NOT* sufficient to indicate that 1601 * this is a URL, as interface names on some platforms might 1602 * include colons (e.g., I think some Solaris interfaces 1603 * might). 1604 */ 1605 colonp = strchr(source, ':'); 1606 if (colonp == NULL) { 1607 /* 1608 * The source is the device to open. 1609 * Return a NULL pointer for the scheme, user information, 1610 * host, and port, and return the device as the path. 1611 */ 1612 *pathp = strdup(source); 1613 if (*pathp == NULL) { 1614 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1615 errno, "malloc"); 1616 return (-1); 1617 } 1618 return (0); 1619 } 1620 1621 /* 1622 * All schemes must have "//" after them, i.e. we only support 1623 * hier-part = "//" authority path-abempty, not 1624 * hier-part = path-absolute 1625 * hier-part = path-rootless 1626 * hier-part = path-empty 1627 * 1628 * We need that in order to distinguish between a local device 1629 * name that happens to contain a colon and a URI. 1630 */ 1631 if (strncmp(colonp + 1, "//", 2) != 0) { 1632 /* 1633 * The source is the device to open. 1634 * Return a NULL pointer for the scheme, user information, 1635 * host, and port, and return the device as the path. 1636 */ 1637 *pathp = strdup(source); 1638 if (*pathp == NULL) { 1639 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1640 errno, "malloc"); 1641 return (-1); 1642 } 1643 return (0); 1644 } 1645 1646 /* 1647 * XXX - check whether the purported scheme could be a scheme? 1648 */ 1649 1650 /* 1651 * OK, this looks like a URL. 1652 * Get the scheme. 1653 */ 1654 scheme_len = colonp - source; 1655 scheme = malloc(scheme_len + 1); 1656 if (scheme == NULL) { 1657 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1658 errno, "malloc"); 1659 return (-1); 1660 } 1661 memcpy(scheme, source, scheme_len); 1662 scheme[scheme_len] = '\0'; 1663 1664 /* 1665 * Treat file: specially - take everything after file:// as 1666 * the pathname. 1667 */ 1668 if (pcap_strcasecmp(scheme, "file") == 0) { 1669 *pathp = strdup(colonp + 3); 1670 if (*pathp == NULL) { 1671 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1672 errno, "malloc"); 1673 free(scheme); 1674 return (-1); 1675 } 1676 *schemep = scheme; 1677 return (0); 1678 } 1679 1680 /* 1681 * The WinPcap documentation says you can specify a local 1682 * interface with "rpcap://{device}"; we special-case 1683 * that here. If the scheme is "rpcap", and there are 1684 * no slashes past the "//", we just return the device. 1685 * 1686 * XXX - %-escaping? 1687 */ 1688 if (pcap_strcasecmp(scheme, "rpcap") == 0 && 1689 strchr(colonp + 3, '/') == NULL) { 1690 /* 1691 * Local device. 1692 * 1693 * Return a NULL pointer for the scheme, user information, 1694 * host, and port, and return the device as the path. 1695 */ 1696 free(scheme); 1697 *pathp = strdup(colonp + 3); 1698 if (*pathp == NULL) { 1699 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1700 errno, "malloc"); 1701 return (-1); 1702 } 1703 return (0); 1704 } 1705 1706 /* 1707 * OK, now start parsing the authority. 1708 * Get token, terminated with / or terminated at the end of 1709 * the string. 1710 */ 1711 authority_len = strcspn(colonp + 3, "/"); 1712 authority = get_substring(colonp + 3, authority_len, ebuf); 1713 if (authority == NULL) { 1714 /* 1715 * Error. 1716 */ 1717 free(scheme); 1718 return (-1); 1719 } 1720 endp = colonp + 3 + authority_len; 1721 1722 /* 1723 * Now carve the authority field into its components. 1724 */ 1725 parsep = authority; 1726 1727 /* 1728 * Is there a userinfo field? 1729 */ 1730 atsignp = strchr(parsep, '@'); 1731 if (atsignp != NULL) { 1732 /* 1733 * Yes. 1734 */ 1735 size_t userinfo_len; 1736 1737 userinfo_len = atsignp - parsep; 1738 userinfo = get_substring(parsep, userinfo_len, ebuf); 1739 if (userinfo == NULL) { 1740 /* 1741 * Error. 1742 */ 1743 free(authority); 1744 free(scheme); 1745 return (-1); 1746 } 1747 parsep = atsignp + 1; 1748 } else { 1749 /* 1750 * No. 1751 */ 1752 userinfo = NULL; 1753 } 1754 1755 /* 1756 * Is there a host field? 1757 */ 1758 if (*parsep == '\0') { 1759 /* 1760 * No; there's no host field or port field. 1761 */ 1762 host = NULL; 1763 port = NULL; 1764 } else { 1765 /* 1766 * Yes. 1767 */ 1768 size_t host_len; 1769 1770 /* 1771 * Is it an IP-literal? 1772 */ 1773 if (*parsep == '[') { 1774 /* 1775 * Yes. 1776 * Treat verything up to the closing square 1777 * bracket as the IP-Literal; we don't worry 1778 * about whether it's a valid IPv6address or 1779 * IPvFuture (or an IPv4address, for that 1780 * matter, just in case we get handed a 1781 * URL with an IPv4 IP-Literal, of the sort 1782 * that pcap_createsrcstr() used to generate, 1783 * and that pcap_parsesrcstr(), in the original 1784 * WinPcap code, accepted). 1785 */ 1786 bracketp = strchr(parsep, ']'); 1787 if (bracketp == NULL) { 1788 /* 1789 * There's no closing square bracket. 1790 */ 1791 pcap_snprintf(ebuf, PCAP_ERRBUF_SIZE, 1792 "IP-literal in URL doesn't end with ]"); 1793 free(userinfo); 1794 free(authority); 1795 free(scheme); 1796 return (-1); 1797 } 1798 if (*(bracketp + 1) != '\0' && 1799 *(bracketp + 1) != ':') { 1800 /* 1801 * There's extra crud after the 1802 * closing square bracketn. 1803 */ 1804 pcap_snprintf(ebuf, PCAP_ERRBUF_SIZE, 1805 "Extra text after IP-literal in URL"); 1806 free(userinfo); 1807 free(authority); 1808 free(scheme); 1809 return (-1); 1810 } 1811 host_len = (bracketp - 1) - parsep; 1812 host = get_substring(parsep + 1, host_len, ebuf); 1813 if (host == NULL) { 1814 /* 1815 * Error. 1816 */ 1817 free(userinfo); 1818 free(authority); 1819 free(scheme); 1820 return (-1); 1821 } 1822 parsep = bracketp + 1; 1823 } else { 1824 /* 1825 * No. 1826 * Treat everything up to a : or the end of 1827 * the string as the host. 1828 */ 1829 host_len = strcspn(parsep, ":"); 1830 host = get_substring(parsep, host_len, ebuf); 1831 if (host == NULL) { 1832 /* 1833 * Error. 1834 */ 1835 free(userinfo); 1836 free(authority); 1837 free(scheme); 1838 return (-1); 1839 } 1840 parsep = parsep + host_len; 1841 } 1842 1843 /* 1844 * Is there a port field? 1845 */ 1846 if (*parsep == ':') { 1847 /* 1848 * Yes. It's the rest of the authority field. 1849 */ 1850 size_t port_len; 1851 1852 parsep++; 1853 port_len = strlen(parsep); 1854 port = get_substring(parsep, port_len, ebuf); 1855 if (port == NULL) { 1856 /* 1857 * Error. 1858 */ 1859 free(host); 1860 free(userinfo); 1861 free(authority); 1862 free(scheme); 1863 return (-1); 1864 } 1865 } else { 1866 /* 1867 * No. 1868 */ 1869 port = NULL; 1870 } 1871 } 1872 free(authority); 1873 1874 /* 1875 * Everything else is the path. Strip off the leading /. 1876 */ 1877 if (*endp == '\0') 1878 path = strdup(""); 1879 else 1880 path = strdup(endp + 1); 1881 if (path == NULL) { 1882 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1883 errno, "malloc"); 1884 free(port); 1885 free(host); 1886 free(userinfo); 1887 free(scheme); 1888 return (-1); 1889 } 1890 *schemep = scheme; 1891 *userinfop = userinfo; 1892 *hostp = host; 1893 *portp = port; 1894 *pathp = path; 1895 return (0); 1896 } 1897 1898 int 1899 pcap_createsrcstr(char *source, int type, const char *host, const char *port, 1900 const char *name, char *errbuf) 1901 { 1902 switch (type) { 1903 1904 case PCAP_SRC_FILE: 1905 pcap_strlcpy(source, PCAP_SRC_FILE_STRING, PCAP_BUF_SIZE); 1906 if (name != NULL && *name != '\0') { 1907 pcap_strlcat(source, name, PCAP_BUF_SIZE); 1908 return (0); 1909 } else { 1910 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1911 "The file name cannot be NULL."); 1912 return (-1); 1913 } 1914 1915 case PCAP_SRC_IFREMOTE: 1916 pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE); 1917 if (host != NULL && *host != '\0') { 1918 if (strchr(host, ':') != NULL) { 1919 /* 1920 * The host name contains a colon, so it's 1921 * probably an IPv6 address, and needs to 1922 * be included in square brackets. 1923 */ 1924 pcap_strlcat(source, "[", PCAP_BUF_SIZE); 1925 pcap_strlcat(source, host, PCAP_BUF_SIZE); 1926 pcap_strlcat(source, "]", PCAP_BUF_SIZE); 1927 } else 1928 pcap_strlcat(source, host, PCAP_BUF_SIZE); 1929 1930 if (port != NULL && *port != '\0') { 1931 pcap_strlcat(source, ":", PCAP_BUF_SIZE); 1932 pcap_strlcat(source, port, PCAP_BUF_SIZE); 1933 } 1934 1935 pcap_strlcat(source, "/", PCAP_BUF_SIZE); 1936 } else { 1937 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1938 "The host name cannot be NULL."); 1939 return (-1); 1940 } 1941 1942 if (name != NULL && *name != '\0') 1943 pcap_strlcat(source, name, PCAP_BUF_SIZE); 1944 1945 return (0); 1946 1947 case PCAP_SRC_IFLOCAL: 1948 pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE); 1949 1950 if (name != NULL && *name != '\0') 1951 pcap_strlcat(source, name, PCAP_BUF_SIZE); 1952 1953 return (0); 1954 1955 default: 1956 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1957 "The interface type is not valid."); 1958 return (-1); 1959 } 1960 } 1961 1962 int 1963 pcap_parsesrcstr(const char *source, int *type, char *host, char *port, 1964 char *name, char *errbuf) 1965 { 1966 char *scheme, *tmpuserinfo, *tmphost, *tmpport, *tmppath; 1967 1968 /* Initialization stuff */ 1969 if (host) 1970 *host = '\0'; 1971 if (port) 1972 *port = '\0'; 1973 if (name) 1974 *name = '\0'; 1975 1976 /* Parse the source string */ 1977 if (pcap_parse_source(source, &scheme, &tmpuserinfo, &tmphost, 1978 &tmpport, &tmppath, errbuf) == -1) { 1979 /* 1980 * Fail. 1981 */ 1982 return (-1); 1983 } 1984 1985 if (scheme == NULL) { 1986 /* 1987 * Local device. 1988 */ 1989 if (name && tmppath) 1990 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); 1991 if (type) 1992 *type = PCAP_SRC_IFLOCAL; 1993 free(tmppath); 1994 free(tmpport); 1995 free(tmphost); 1996 free(tmpuserinfo); 1997 return (0); 1998 } 1999 2000 if (strcmp(scheme, "rpcap") == 0) { 2001 /* 2002 * rpcap:// 2003 * 2004 * pcap_parse_source() has already handled the case of 2005 * rpcap://device 2006 */ 2007 if (host && tmphost) { 2008 if (tmpuserinfo) 2009 pcap_snprintf(host, PCAP_BUF_SIZE, "%s@%s", 2010 tmpuserinfo, tmphost); 2011 else 2012 pcap_strlcpy(host, tmphost, PCAP_BUF_SIZE); 2013 } 2014 if (port && tmpport) 2015 pcap_strlcpy(port, tmpport, PCAP_BUF_SIZE); 2016 if (name && tmppath) 2017 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); 2018 if (type) 2019 *type = PCAP_SRC_IFREMOTE; 2020 free(tmppath); 2021 free(tmpport); 2022 free(tmphost); 2023 free(tmpuserinfo); 2024 free(scheme); 2025 return (0); 2026 } 2027 2028 if (strcmp(scheme, "file") == 0) { 2029 /* 2030 * file:// 2031 */ 2032 if (name && tmppath) 2033 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); 2034 if (type) 2035 *type = PCAP_SRC_FILE; 2036 free(tmppath); 2037 free(tmpport); 2038 free(tmphost); 2039 free(tmpuserinfo); 2040 free(scheme); 2041 return (0); 2042 } 2043 2044 /* 2045 * Neither rpcap: nor file:; just treat the entire string 2046 * as a local device. 2047 */ 2048 if (name) 2049 pcap_strlcpy(name, source, PCAP_BUF_SIZE); 2050 if (type) 2051 *type = PCAP_SRC_IFLOCAL; 2052 free(tmppath); 2053 free(tmpport); 2054 free(tmphost); 2055 free(tmpuserinfo); 2056 free(scheme); 2057 return (0); 2058 } 2059 #endif 2060 2061 pcap_t * 2062 pcap_create(const char *device, char *errbuf) 2063 { 2064 size_t i; 2065 int is_theirs; 2066 pcap_t *p; 2067 char *device_str; 2068 2069 /* 2070 * A null device name is equivalent to the "any" device - 2071 * which might not be supported on this platform, but 2072 * this means that you'll get a "not supported" error 2073 * rather than, say, a crash when we try to dereference 2074 * the null pointer. 2075 */ 2076 if (device == NULL) 2077 device_str = strdup("any"); 2078 else { 2079 #ifdef _WIN32 2080 /* 2081 * On Windows, for backwards compatibility reasons, 2082 * pcap_lookupdev() returns a pointer to a sequence of 2083 * pairs of UTF-16LE device names and local code page 2084 * description strings. 2085 * 2086 * This means that if a program uses pcap_lookupdev() 2087 * to get a default device, and hands that to an API 2088 * that opens devices, we'll get handed a UTF-16LE 2089 * string, not a string in the local code page. 2090 * 2091 * To work around that, we check whether the string 2092 * looks as if it might be a UTF-16LE strinh and, if 2093 * so, convert it back to the local code page's 2094 * extended ASCII. 2095 * 2096 * XXX - you *cannot* reliably detect whether a 2097 * string is UTF-16LE or not; "a" could either 2098 * be a one-character ASCII string or the first 2099 * character of a UTF-16LE string. This particular 2100 * version of this heuristic dates back to WinPcap 2101 * 4.1.1; PacketOpenAdapter() does uses the same 2102 * heuristic, with the exact same vulnerability. 2103 */ 2104 if (device[0] != '\0' && device[1] == '\0') { 2105 size_t length; 2106 2107 length = wcslen((wchar_t *)device); 2108 device_str = (char *)malloc(length + 1); 2109 if (device_str == NULL) { 2110 pcap_fmt_errmsg_for_errno(errbuf, 2111 PCAP_ERRBUF_SIZE, errno, 2112 "malloc"); 2113 return (NULL); 2114 } 2115 2116 pcap_snprintf(device_str, length + 1, "%ws", 2117 (const wchar_t *)device); 2118 } else 2119 #endif 2120 device_str = strdup(device); 2121 } 2122 if (device_str == NULL) { 2123 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 2124 errno, "malloc"); 2125 return (NULL); 2126 } 2127 2128 /* 2129 * Try each of the non-local-network-interface capture 2130 * source types until we find one that works for this 2131 * device or run out of types. 2132 */ 2133 for (i = 0; capture_source_types[i].create_op != NULL; i++) { 2134 is_theirs = 0; 2135 p = capture_source_types[i].create_op(device_str, errbuf, 2136 &is_theirs); 2137 if (is_theirs) { 2138 /* 2139 * The device name refers to a device of the 2140 * type in question; either it succeeded, 2141 * in which case p refers to a pcap_t to 2142 * later activate for the device, or it 2143 * failed, in which case p is null and we 2144 * should return that to report the failure 2145 * to create. 2146 */ 2147 if (p == NULL) { 2148 /* 2149 * We assume the caller filled in errbuf. 2150 */ 2151 free(device_str); 2152 return (NULL); 2153 } 2154 p->opt.device = device_str; 2155 return (p); 2156 } 2157 } 2158 2159 /* 2160 * OK, try it as a regular network interface. 2161 */ 2162 p = pcap_create_interface(device_str, errbuf); 2163 if (p == NULL) { 2164 /* 2165 * We assume the caller filled in errbuf. 2166 */ 2167 free(device_str); 2168 return (NULL); 2169 } 2170 p->opt.device = device_str; 2171 return (p); 2172 } 2173 2174 /* 2175 * Set nonblocking mode on an unactivated pcap_t; this sets a flag 2176 * checked by pcap_activate(), which sets the mode after calling 2177 * the activate routine. 2178 */ 2179 static int 2180 pcap_setnonblock_unactivated(pcap_t *p, int nonblock) 2181 { 2182 p->opt.nonblock = nonblock; 2183 return (0); 2184 } 2185 2186 static void 2187 initialize_ops(pcap_t *p) 2188 { 2189 /* 2190 * Set operation pointers for operations that only work on 2191 * an activated pcap_t to point to a routine that returns 2192 * a "this isn't activated" error. 2193 */ 2194 p->read_op = pcap_read_not_initialized; 2195 p->inject_op = pcap_inject_not_initialized; 2196 p->setfilter_op = pcap_setfilter_not_initialized; 2197 p->setdirection_op = pcap_setdirection_not_initialized; 2198 p->set_datalink_op = pcap_set_datalink_not_initialized; 2199 p->getnonblock_op = pcap_getnonblock_not_initialized; 2200 p->stats_op = pcap_stats_not_initialized; 2201 #ifdef _WIN32 2202 p->stats_ex_op = pcap_stats_ex_not_initialized; 2203 p->setbuff_op = pcap_setbuff_not_initialized; 2204 p->setmode_op = pcap_setmode_not_initialized; 2205 p->setmintocopy_op = pcap_setmintocopy_not_initialized; 2206 p->getevent_op = pcap_getevent_not_initialized; 2207 p->oid_get_request_op = pcap_oid_get_request_not_initialized; 2208 p->oid_set_request_op = pcap_oid_set_request_not_initialized; 2209 p->sendqueue_transmit_op = pcap_sendqueue_transmit_not_initialized; 2210 p->setuserbuffer_op = pcap_setuserbuffer_not_initialized; 2211 p->live_dump_op = pcap_live_dump_not_initialized; 2212 p->live_dump_ended_op = pcap_live_dump_ended_not_initialized; 2213 p->get_airpcap_handle_op = pcap_get_airpcap_handle_not_initialized; 2214 #endif 2215 2216 /* 2217 * Default cleanup operation - implementations can override 2218 * this, but should call pcap_cleanup_live_common() after 2219 * doing their own additional cleanup. 2220 */ 2221 p->cleanup_op = pcap_cleanup_live_common; 2222 2223 /* 2224 * In most cases, the standard one-shot callback can 2225 * be used for pcap_next()/pcap_next_ex(). 2226 */ 2227 p->oneshot_callback = pcap_oneshot; 2228 } 2229 2230 static pcap_t * 2231 pcap_alloc_pcap_t(char *ebuf, size_t size) 2232 { 2233 char *chunk; 2234 pcap_t *p; 2235 2236 /* 2237 * Allocate a chunk of memory big enough for a pcap_t 2238 * plus a structure following it of size "size". The 2239 * structure following it is a private data structure 2240 * for the routines that handle this pcap_t. 2241 * 2242 * The structure following it must be aligned on 2243 * the appropriate alignment boundary for this platform. 2244 * We align on an 8-byte boundary as that's probably what 2245 * at least some platforms do, even with 32-bit integers, 2246 * and because we can't be sure that some values won't 2247 * require 8-byte alignment even on platforms with 32-bit 2248 * integers. 2249 */ 2250 #define PCAP_T_ALIGNED_SIZE ((sizeof(pcap_t) + 7U) & ~0x7U) 2251 chunk = malloc(PCAP_T_ALIGNED_SIZE + size); 2252 if (chunk == NULL) { 2253 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 2254 errno, "malloc"); 2255 return (NULL); 2256 } 2257 memset(chunk, 0, PCAP_T_ALIGNED_SIZE + size); 2258 2259 /* 2260 * Get a pointer to the pcap_t at the beginning. 2261 */ 2262 p = (pcap_t *)chunk; 2263 2264 #ifdef _WIN32 2265 p->handle = INVALID_HANDLE_VALUE; /* not opened yet */ 2266 #else /* _WIN32 */ 2267 p->fd = -1; /* not opened yet */ 2268 #ifndef MSDOS 2269 p->selectable_fd = -1; 2270 p->required_select_timeout = NULL; 2271 #endif /* MSDOS */ 2272 #endif /* _WIN32 */ 2273 2274 if (size == 0) { 2275 /* No private data was requested. */ 2276 p->priv = NULL; 2277 } else { 2278 /* 2279 * Set the pointer to the private data; that's the structure 2280 * of size "size" following the pcap_t. 2281 */ 2282 p->priv = (void *)(chunk + PCAP_T_ALIGNED_SIZE); 2283 } 2284 2285 return (p); 2286 } 2287 2288 pcap_t * 2289 pcap_create_common(char *ebuf, size_t size) 2290 { 2291 pcap_t *p; 2292 2293 p = pcap_alloc_pcap_t(ebuf, size); 2294 if (p == NULL) 2295 return (NULL); 2296 2297 /* 2298 * Default to "can't set rfmon mode"; if it's supported by 2299 * a platform, the create routine that called us can set 2300 * the op to its routine to check whether a particular 2301 * device supports it. 2302 */ 2303 p->can_set_rfmon_op = pcap_cant_set_rfmon; 2304 2305 /* 2306 * If pcap_setnonblock() is called on a not-yet-activated 2307 * pcap_t, default to setting a flag and turning 2308 * on non-blocking mode when activated. 2309 */ 2310 p->setnonblock_op = pcap_setnonblock_unactivated; 2311 2312 initialize_ops(p); 2313 2314 /* put in some defaults*/ 2315 p->snapshot = 0; /* max packet size unspecified */ 2316 p->opt.timeout = 0; /* no timeout specified */ 2317 p->opt.buffer_size = 0; /* use the platform's default */ 2318 p->opt.promisc = 0; 2319 p->opt.rfmon = 0; 2320 p->opt.immediate = 0; 2321 p->opt.tstamp_type = -1; /* default to not setting time stamp type */ 2322 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO; 2323 /* 2324 * Platform-dependent options. 2325 */ 2326 #ifdef __linux__ 2327 p->opt.protocol = 0; 2328 #endif 2329 #ifdef _WIN32 2330 p->opt.nocapture_local = 0; 2331 #endif 2332 2333 /* 2334 * Start out with no BPF code generation flags set. 2335 */ 2336 p->bpf_codegen_flags = 0; 2337 2338 return (p); 2339 } 2340 2341 int 2342 pcap_check_activated(pcap_t *p) 2343 { 2344 if (p->activated) { 2345 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform " 2346 " operation on activated capture"); 2347 return (-1); 2348 } 2349 return (0); 2350 } 2351 2352 int 2353 pcap_set_snaplen(pcap_t *p, int snaplen) 2354 { 2355 if (pcap_check_activated(p)) 2356 return (PCAP_ERROR_ACTIVATED); 2357 p->snapshot = snaplen; 2358 return (0); 2359 } 2360 2361 int 2362 pcap_set_promisc(pcap_t *p, int promisc) 2363 { 2364 if (pcap_check_activated(p)) 2365 return (PCAP_ERROR_ACTIVATED); 2366 p->opt.promisc = promisc; 2367 return (0); 2368 } 2369 2370 int 2371 pcap_set_rfmon(pcap_t *p, int rfmon) 2372 { 2373 if (pcap_check_activated(p)) 2374 return (PCAP_ERROR_ACTIVATED); 2375 p->opt.rfmon = rfmon; 2376 return (0); 2377 } 2378 2379 int 2380 pcap_set_timeout(pcap_t *p, int timeout_ms) 2381 { 2382 if (pcap_check_activated(p)) 2383 return (PCAP_ERROR_ACTIVATED); 2384 p->opt.timeout = timeout_ms; 2385 return (0); 2386 } 2387 2388 int 2389 pcap_set_tstamp_type(pcap_t *p, int tstamp_type) 2390 { 2391 int i; 2392 2393 if (pcap_check_activated(p)) 2394 return (PCAP_ERROR_ACTIVATED); 2395 2396 /* 2397 * The argument should have been u_int, but that's too late 2398 * to change now - it's an API. 2399 */ 2400 if (tstamp_type < 0) 2401 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP); 2402 2403 /* 2404 * If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST; 2405 * the default time stamp type is PCAP_TSTAMP_HOST. 2406 */ 2407 if (p->tstamp_type_count == 0) { 2408 if (tstamp_type == PCAP_TSTAMP_HOST) { 2409 p->opt.tstamp_type = tstamp_type; 2410 return (0); 2411 } 2412 } else { 2413 /* 2414 * Check whether we claim to support this type of time stamp. 2415 */ 2416 for (i = 0; i < p->tstamp_type_count; i++) { 2417 if (p->tstamp_type_list[i] == (u_int)tstamp_type) { 2418 /* 2419 * Yes. 2420 */ 2421 p->opt.tstamp_type = tstamp_type; 2422 return (0); 2423 } 2424 } 2425 } 2426 2427 /* 2428 * We don't support this type of time stamp. 2429 */ 2430 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP); 2431 } 2432 2433 int 2434 pcap_set_immediate_mode(pcap_t *p, int immediate) 2435 { 2436 if (pcap_check_activated(p)) 2437 return (PCAP_ERROR_ACTIVATED); 2438 p->opt.immediate = immediate; 2439 return (0); 2440 } 2441 2442 int 2443 pcap_set_buffer_size(pcap_t *p, int buffer_size) 2444 { 2445 if (pcap_check_activated(p)) 2446 return (PCAP_ERROR_ACTIVATED); 2447 if (buffer_size <= 0) { 2448 /* 2449 * Silently ignore invalid values. 2450 */ 2451 return (0); 2452 } 2453 p->opt.buffer_size = buffer_size; 2454 return (0); 2455 } 2456 2457 int 2458 pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision) 2459 { 2460 int i; 2461 2462 if (pcap_check_activated(p)) 2463 return (PCAP_ERROR_ACTIVATED); 2464 2465 /* 2466 * The argument should have been u_int, but that's too late 2467 * to change now - it's an API. 2468 */ 2469 if (tstamp_precision < 0) 2470 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP); 2471 2472 /* 2473 * If p->tstamp_precision_count is 0, we only support setting 2474 * the time stamp precision to microsecond precision; every 2475 * pcap module *MUST* support microsecond precision, even if 2476 * it does so by converting the native precision to 2477 * microseconds. 2478 */ 2479 if (p->tstamp_precision_count == 0) { 2480 if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) { 2481 p->opt.tstamp_precision = tstamp_precision; 2482 return (0); 2483 } 2484 } else { 2485 /* 2486 * Check whether we claim to support this precision of 2487 * time stamp. 2488 */ 2489 for (i = 0; i < p->tstamp_precision_count; i++) { 2490 if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) { 2491 /* 2492 * Yes. 2493 */ 2494 p->opt.tstamp_precision = tstamp_precision; 2495 return (0); 2496 } 2497 } 2498 } 2499 2500 /* 2501 * We don't support this time stamp precision. 2502 */ 2503 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP); 2504 } 2505 2506 int 2507 pcap_get_tstamp_precision(pcap_t *p) 2508 { 2509 return (p->opt.tstamp_precision); 2510 } 2511 2512 int 2513 pcap_activate(pcap_t *p) 2514 { 2515 int status; 2516 2517 /* 2518 * Catch attempts to re-activate an already-activated 2519 * pcap_t; this should, for example, catch code that 2520 * calls pcap_open_live() followed by pcap_activate(), 2521 * as some code that showed up in a Stack Exchange 2522 * question did. 2523 */ 2524 if (pcap_check_activated(p)) 2525 return (PCAP_ERROR_ACTIVATED); 2526 status = p->activate_op(p); 2527 if (status >= 0) { 2528 /* 2529 * If somebody requested non-blocking mode before 2530 * calling pcap_activate(), turn it on now. 2531 */ 2532 if (p->opt.nonblock) { 2533 status = p->setnonblock_op(p, 1); 2534 if (status < 0) { 2535 /* 2536 * Failed. Undo everything done by 2537 * the activate operation. 2538 */ 2539 p->cleanup_op(p); 2540 initialize_ops(p); 2541 return (status); 2542 } 2543 } 2544 p->activated = 1; 2545 } else { 2546 if (p->errbuf[0] == '\0') { 2547 /* 2548 * No error message supplied by the activate routine; 2549 * for the benefit of programs that don't specially 2550 * handle errors other than PCAP_ERROR, return the 2551 * error message corresponding to the status. 2552 */ 2553 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s", 2554 pcap_statustostr(status)); 2555 } 2556 2557 /* 2558 * Undo any operation pointer setting, etc. done by 2559 * the activate operation. 2560 */ 2561 initialize_ops(p); 2562 } 2563 return (status); 2564 } 2565 2566 pcap_t * 2567 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf) 2568 { 2569 pcap_t *p; 2570 int status; 2571 #ifdef ENABLE_REMOTE 2572 char host[PCAP_BUF_SIZE + 1]; 2573 char port[PCAP_BUF_SIZE + 1]; 2574 char name[PCAP_BUF_SIZE + 1]; 2575 int srctype; 2576 2577 /* 2578 * A null device name is equivalent to the "any" device - 2579 * which might not be supported on this platform, but 2580 * this means that you'll get a "not supported" error 2581 * rather than, say, a crash when we try to dereference 2582 * the null pointer. 2583 */ 2584 if (device == NULL) 2585 device = "any"; 2586 2587 /* 2588 * Retrofit - we have to make older applications compatible with 2589 * remote capture. 2590 * So we're calling pcap_open_remote() from here; this is a very 2591 * dirty hack. 2592 * Obviously, we cannot exploit all the new features; for instance, 2593 * we cannot send authentication, we cannot use a UDP data connection, 2594 * and so on. 2595 */ 2596 if (pcap_parsesrcstr(device, &srctype, host, port, name, errbuf)) 2597 return (NULL); 2598 2599 if (srctype == PCAP_SRC_IFREMOTE) { 2600 /* 2601 * Although we already have host, port and iface, we prefer 2602 * to pass only 'device' to pcap_open_rpcap(), so that it has 2603 * to call pcap_parsesrcstr() again. 2604 * This is less optimized, but much clearer. 2605 */ 2606 return (pcap_open_rpcap(device, snaplen, 2607 promisc ? PCAP_OPENFLAG_PROMISCUOUS : 0, to_ms, 2608 NULL, errbuf)); 2609 } 2610 if (srctype == PCAP_SRC_FILE) { 2611 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown URL scheme \"file\""); 2612 return (NULL); 2613 } 2614 if (srctype == PCAP_SRC_IFLOCAL) { 2615 /* 2616 * If it starts with rpcap://, that refers to a local device 2617 * (no host part in the URL). Remove the rpcap://, and 2618 * fall through to the regular open path. 2619 */ 2620 if (strncmp(device, PCAP_SRC_IF_STRING, strlen(PCAP_SRC_IF_STRING)) == 0) { 2621 size_t len = strlen(device) - strlen(PCAP_SRC_IF_STRING) + 1; 2622 2623 if (len > 0) 2624 device += strlen(PCAP_SRC_IF_STRING); 2625 } 2626 } 2627 #endif /* ENABLE_REMOTE */ 2628 2629 p = pcap_create(device, errbuf); 2630 if (p == NULL) 2631 return (NULL); 2632 status = pcap_set_snaplen(p, snaplen); 2633 if (status < 0) 2634 goto fail; 2635 status = pcap_set_promisc(p, promisc); 2636 if (status < 0) 2637 goto fail; 2638 status = pcap_set_timeout(p, to_ms); 2639 if (status < 0) 2640 goto fail; 2641 /* 2642 * Mark this as opened with pcap_open_live(), so that, for 2643 * example, we show the full list of DLT_ values, rather 2644 * than just the ones that are compatible with capturing 2645 * when not in monitor mode. That allows existing applications 2646 * to work the way they used to work, but allows new applications 2647 * that know about the new open API to, for example, find out the 2648 * DLT_ values that they can select without changing whether 2649 * the adapter is in monitor mode or not. 2650 */ 2651 p->oldstyle = 1; 2652 status = pcap_activate(p); 2653 if (status < 0) 2654 goto fail; 2655 return (p); 2656 fail: 2657 if (status == PCAP_ERROR) 2658 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %.*s", device, 2659 PCAP_ERRBUF_SIZE - 3, p->errbuf); 2660 else if (status == PCAP_ERROR_NO_SUCH_DEVICE || 2661 status == PCAP_ERROR_PERM_DENIED || 2662 status == PCAP_ERROR_PROMISC_PERM_DENIED) 2663 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%.*s)", device, 2664 pcap_statustostr(status), PCAP_ERRBUF_SIZE - 6, p->errbuf); 2665 else 2666 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device, 2667 pcap_statustostr(status)); 2668 pcap_close(p); 2669 return (NULL); 2670 } 2671 2672 pcap_t * 2673 pcap_open_offline_common(char *ebuf, size_t size) 2674 { 2675 pcap_t *p; 2676 2677 p = pcap_alloc_pcap_t(ebuf, size); 2678 if (p == NULL) 2679 return (NULL); 2680 2681 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO; 2682 2683 return (p); 2684 } 2685 2686 int 2687 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 2688 { 2689 return (p->read_op(p, cnt, callback, user)); 2690 } 2691 2692 int 2693 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 2694 { 2695 register int n; 2696 2697 for (;;) { 2698 if (p->rfile != NULL) { 2699 /* 2700 * 0 means EOF, so don't loop if we get 0. 2701 */ 2702 n = pcap_offline_read(p, cnt, callback, user); 2703 } else { 2704 /* 2705 * XXX keep reading until we get something 2706 * (or an error occurs) 2707 */ 2708 do { 2709 n = p->read_op(p, cnt, callback, user); 2710 } while (n == 0); 2711 } 2712 if (n <= 0) 2713 return (n); 2714 if (!PACKET_COUNT_IS_UNLIMITED(cnt)) { 2715 cnt -= n; 2716 if (cnt <= 0) 2717 return (0); 2718 } 2719 } 2720 } 2721 2722 /* 2723 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate. 2724 */ 2725 void 2726 pcap_breakloop(pcap_t *p) 2727 { 2728 p->break_loop = 1; 2729 } 2730 2731 int 2732 pcap_datalink(pcap_t *p) 2733 { 2734 if (!p->activated) 2735 return (PCAP_ERROR_NOT_ACTIVATED); 2736 return (p->linktype); 2737 } 2738 2739 int 2740 pcap_datalink_ext(pcap_t *p) 2741 { 2742 if (!p->activated) 2743 return (PCAP_ERROR_NOT_ACTIVATED); 2744 return (p->linktype_ext); 2745 } 2746 2747 int 2748 pcap_list_datalinks(pcap_t *p, int **dlt_buffer) 2749 { 2750 if (!p->activated) 2751 return (PCAP_ERROR_NOT_ACTIVATED); 2752 if (p->dlt_count == 0) { 2753 /* 2754 * We couldn't fetch the list of DLTs, which means 2755 * this platform doesn't support changing the 2756 * DLT for an interface. Return a list of DLTs 2757 * containing only the DLT this device supports. 2758 */ 2759 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); 2760 if (*dlt_buffer == NULL) { 2761 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 2762 errno, "malloc"); 2763 return (PCAP_ERROR); 2764 } 2765 **dlt_buffer = p->linktype; 2766 return (1); 2767 } else { 2768 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count); 2769 if (*dlt_buffer == NULL) { 2770 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 2771 errno, "malloc"); 2772 return (PCAP_ERROR); 2773 } 2774 (void)memcpy(*dlt_buffer, p->dlt_list, 2775 sizeof(**dlt_buffer) * p->dlt_count); 2776 return (p->dlt_count); 2777 } 2778 } 2779 2780 /* 2781 * In Windows, you might have a library built with one version of the 2782 * C runtime library and an application built with another version of 2783 * the C runtime library, which means that the library might use one 2784 * version of malloc() and free() and the application might use another 2785 * version of malloc() and free(). If so, that means something 2786 * allocated by the library cannot be freed by the application, so we 2787 * need to have a pcap_free_datalinks() routine to free up the list 2788 * allocated by pcap_list_datalinks(), even though it's just a wrapper 2789 * around free(). 2790 */ 2791 void 2792 pcap_free_datalinks(int *dlt_list) 2793 { 2794 free(dlt_list); 2795 } 2796 2797 int 2798 pcap_set_datalink(pcap_t *p, int dlt) 2799 { 2800 int i; 2801 const char *dlt_name; 2802 2803 if (dlt < 0) 2804 goto unsupported; 2805 2806 if (p->dlt_count == 0 || p->set_datalink_op == NULL) { 2807 /* 2808 * We couldn't fetch the list of DLTs, or we don't 2809 * have a "set datalink" operation, which means 2810 * this platform doesn't support changing the 2811 * DLT for an interface. Check whether the new 2812 * DLT is the one this interface supports. 2813 */ 2814 if (p->linktype != dlt) 2815 goto unsupported; 2816 2817 /* 2818 * It is, so there's nothing we need to do here. 2819 */ 2820 return (0); 2821 } 2822 for (i = 0; i < p->dlt_count; i++) 2823 if (p->dlt_list[i] == (u_int)dlt) 2824 break; 2825 if (i >= p->dlt_count) 2826 goto unsupported; 2827 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB && 2828 dlt == DLT_DOCSIS) { 2829 /* 2830 * This is presumably an Ethernet device, as the first 2831 * link-layer type it offers is DLT_EN10MB, and the only 2832 * other type it offers is DLT_DOCSIS. That means that 2833 * we can't tell the driver to supply DOCSIS link-layer 2834 * headers - we're just pretending that's what we're 2835 * getting, as, presumably, we're capturing on a dedicated 2836 * link to a Cisco Cable Modem Termination System, and 2837 * it's putting raw DOCSIS frames on the wire inside low-level 2838 * Ethernet framing. 2839 */ 2840 p->linktype = dlt; 2841 return (0); 2842 } 2843 if (p->set_datalink_op(p, dlt) == -1) 2844 return (-1); 2845 p->linktype = dlt; 2846 return (0); 2847 2848 unsupported: 2849 dlt_name = pcap_datalink_val_to_name(dlt); 2850 if (dlt_name != NULL) { 2851 (void) pcap_snprintf(p->errbuf, sizeof(p->errbuf), 2852 "%s is not one of the DLTs supported by this device", 2853 dlt_name); 2854 } else { 2855 (void) pcap_snprintf(p->errbuf, sizeof(p->errbuf), 2856 "DLT %d is not one of the DLTs supported by this device", 2857 dlt); 2858 } 2859 return (-1); 2860 } 2861 2862 /* 2863 * This array is designed for mapping upper and lower case letter 2864 * together for a case independent comparison. The mappings are 2865 * based upon ascii character sequences. 2866 */ 2867 static const u_char charmap[] = { 2868 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003', 2869 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007', 2870 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013', 2871 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017', 2872 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023', 2873 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027', 2874 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033', 2875 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037', 2876 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043', 2877 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047', 2878 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053', 2879 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057', 2880 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063', 2881 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067', 2882 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073', 2883 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077', 2884 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143', 2885 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 2886 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 2887 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 2888 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 2889 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 2890 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133', 2891 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137', 2892 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143', 2893 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 2894 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 2895 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 2896 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 2897 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 2898 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173', 2899 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177', 2900 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203', 2901 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207', 2902 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213', 2903 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217', 2904 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223', 2905 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227', 2906 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233', 2907 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237', 2908 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243', 2909 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247', 2910 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253', 2911 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257', 2912 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263', 2913 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267', 2914 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273', 2915 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277', 2916 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343', 2917 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 2918 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 2919 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 2920 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 2921 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 2922 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333', 2923 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337', 2924 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343', 2925 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 2926 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 2927 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 2928 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 2929 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 2930 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373', 2931 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377', 2932 }; 2933 2934 int 2935 pcap_strcasecmp(const char *s1, const char *s2) 2936 { 2937 register const u_char *cm = charmap, 2938 *us1 = (const u_char *)s1, 2939 *us2 = (const u_char *)s2; 2940 2941 while (cm[*us1] == cm[*us2++]) 2942 if (*us1++ == '\0') 2943 return(0); 2944 return (cm[*us1] - cm[*--us2]); 2945 } 2946 2947 struct dlt_choice { 2948 const char *name; 2949 const char *description; 2950 int dlt; 2951 }; 2952 2953 #define DLT_CHOICE(code, description) { #code, description, DLT_ ## code } 2954 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 } 2955 2956 static struct dlt_choice dlt_choices[] = { 2957 DLT_CHOICE(NULL, "BSD loopback"), 2958 DLT_CHOICE(EN10MB, "Ethernet"), 2959 DLT_CHOICE(IEEE802, "Token ring"), 2960 DLT_CHOICE(ARCNET, "BSD ARCNET"), 2961 DLT_CHOICE(SLIP, "SLIP"), 2962 DLT_CHOICE(PPP, "PPP"), 2963 DLT_CHOICE(FDDI, "FDDI"), 2964 DLT_CHOICE(ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"), 2965 DLT_CHOICE(RAW, "Raw IP"), 2966 DLT_CHOICE(SLIP_BSDOS, "BSD/OS SLIP"), 2967 DLT_CHOICE(PPP_BSDOS, "BSD/OS PPP"), 2968 DLT_CHOICE(ATM_CLIP, "Linux Classical IP-over-ATM"), 2969 DLT_CHOICE(PPP_SERIAL, "PPP over serial"), 2970 DLT_CHOICE(PPP_ETHER, "PPPoE"), 2971 DLT_CHOICE(SYMANTEC_FIREWALL, "Symantec Firewall"), 2972 DLT_CHOICE(C_HDLC, "Cisco HDLC"), 2973 DLT_CHOICE(IEEE802_11, "802.11"), 2974 DLT_CHOICE(FRELAY, "Frame Relay"), 2975 DLT_CHOICE(LOOP, "OpenBSD loopback"), 2976 DLT_CHOICE(ENC, "OpenBSD encapsulated IP"), 2977 DLT_CHOICE(LINUX_SLL, "Linux cooked v1"), 2978 DLT_CHOICE(LTALK, "Localtalk"), 2979 DLT_CHOICE(PFLOG, "OpenBSD pflog file"), 2980 DLT_CHOICE(PFSYNC, "Packet filter state syncing"), 2981 DLT_CHOICE(PRISM_HEADER, "802.11 plus Prism header"), 2982 DLT_CHOICE(IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"), 2983 DLT_CHOICE(SUNATM, "Sun raw ATM"), 2984 DLT_CHOICE(IEEE802_11_RADIO, "802.11 plus radiotap header"), 2985 DLT_CHOICE(ARCNET_LINUX, "Linux ARCNET"), 2986 DLT_CHOICE(JUNIPER_MLPPP, "Juniper Multi-Link PPP"), 2987 DLT_CHOICE(JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"), 2988 DLT_CHOICE(JUNIPER_ES, "Juniper Encryption Services PIC"), 2989 DLT_CHOICE(JUNIPER_GGSN, "Juniper GGSN PIC"), 2990 DLT_CHOICE(JUNIPER_MFR, "Juniper FRF.16 Frame Relay"), 2991 DLT_CHOICE(JUNIPER_ATM2, "Juniper ATM2 PIC"), 2992 DLT_CHOICE(JUNIPER_SERVICES, "Juniper Advanced Services PIC"), 2993 DLT_CHOICE(JUNIPER_ATM1, "Juniper ATM1 PIC"), 2994 DLT_CHOICE(APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"), 2995 DLT_CHOICE(MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"), 2996 DLT_CHOICE(MTP2, "SS7 MTP2"), 2997 DLT_CHOICE(MTP3, "SS7 MTP3"), 2998 DLT_CHOICE(SCCP, "SS7 SCCP"), 2999 DLT_CHOICE(DOCSIS, "DOCSIS"), 3000 DLT_CHOICE(LINUX_IRDA, "Linux IrDA"), 3001 DLT_CHOICE(IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"), 3002 DLT_CHOICE(JUNIPER_MONITOR, "Juniper Passive Monitor PIC"), 3003 DLT_CHOICE(BACNET_MS_TP, "BACnet MS/TP"), 3004 DLT_CHOICE(PPP_PPPD, "PPP for pppd, with direction flag"), 3005 DLT_CHOICE(JUNIPER_PPPOE, "Juniper PPPoE"), 3006 DLT_CHOICE(JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"), 3007 DLT_CHOICE(GPRS_LLC, "GPRS LLC"), 3008 DLT_CHOICE(GPF_T, "GPF-T"), 3009 DLT_CHOICE(GPF_F, "GPF-F"), 3010 DLT_CHOICE(JUNIPER_PIC_PEER, "Juniper PIC Peer"), 3011 DLT_CHOICE(ERF_ETH, "Ethernet with Endace ERF header"), 3012 DLT_CHOICE(ERF_POS, "Packet-over-SONET with Endace ERF header"), 3013 DLT_CHOICE(LINUX_LAPD, "Linux vISDN LAPD"), 3014 DLT_CHOICE(JUNIPER_ETHER, "Juniper Ethernet"), 3015 DLT_CHOICE(JUNIPER_PPP, "Juniper PPP"), 3016 DLT_CHOICE(JUNIPER_FRELAY, "Juniper Frame Relay"), 3017 DLT_CHOICE(JUNIPER_CHDLC, "Juniper C-HDLC"), 3018 DLT_CHOICE(MFR, "FRF.16 Frame Relay"), 3019 DLT_CHOICE(JUNIPER_VP, "Juniper Voice PIC"), 3020 DLT_CHOICE(A429, "Arinc 429"), 3021 DLT_CHOICE(A653_ICM, "Arinc 653 Interpartition Communication"), 3022 DLT_CHOICE(USB_FREEBSD, "USB with FreeBSD header"), 3023 DLT_CHOICE(BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"), 3024 DLT_CHOICE(IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"), 3025 DLT_CHOICE(USB_LINUX, "USB with Linux header"), 3026 DLT_CHOICE(CAN20B, "Controller Area Network (CAN) v. 2.0B"), 3027 DLT_CHOICE(IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"), 3028 DLT_CHOICE(PPI, "Per-Packet Information"), 3029 DLT_CHOICE(IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"), 3030 DLT_CHOICE(JUNIPER_ISM, "Juniper Integrated Service Module"), 3031 DLT_CHOICE(IEEE802_15_4, "IEEE 802.15.4 with FCS"), 3032 DLT_CHOICE(SITA, "SITA pseudo-header"), 3033 DLT_CHOICE(ERF, "Endace ERF header"), 3034 DLT_CHOICE(RAIF1, "Ethernet with u10 Networks pseudo-header"), 3035 DLT_CHOICE(IPMB_KONTRON, "IPMB with Kontron pseudo-header"), 3036 DLT_CHOICE(JUNIPER_ST, "Juniper Secure Tunnel"), 3037 DLT_CHOICE(BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"), 3038 DLT_CHOICE(AX25_KISS, "AX.25 with KISS header"), 3039 DLT_CHOICE(IPMB_LINUX, "IPMB with Linux/Pigeon Point pseudo-header"), 3040 DLT_CHOICE(IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"), 3041 DLT_CHOICE(MPLS, "MPLS with label as link-layer header"), 3042 DLT_CHOICE(LINUX_EVDEV, "Linux evdev events"), 3043 DLT_CHOICE(USB_LINUX_MMAPPED, "USB with padded Linux header"), 3044 DLT_CHOICE(DECT, "DECT"), 3045 DLT_CHOICE(AOS, "AOS Space Data Link protocol"), 3046 DLT_CHOICE(WIHART, "Wireless HART"), 3047 DLT_CHOICE(FC_2, "Fibre Channel FC-2"), 3048 DLT_CHOICE(FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"), 3049 DLT_CHOICE(IPNET, "Solaris ipnet"), 3050 DLT_CHOICE(CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"), 3051 DLT_CHOICE(IPV4, "Raw IPv4"), 3052 DLT_CHOICE(IPV6, "Raw IPv6"), 3053 DLT_CHOICE(IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"), 3054 DLT_CHOICE(DBUS, "D-Bus"), 3055 DLT_CHOICE(JUNIPER_VS, "Juniper Virtual Server"), 3056 DLT_CHOICE(JUNIPER_SRX_E2E, "Juniper SRX E2E"), 3057 DLT_CHOICE(JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"), 3058 DLT_CHOICE(DVB_CI, "DVB-CI"), 3059 DLT_CHOICE(MUX27010, "MUX27010"), 3060 DLT_CHOICE(STANAG_5066_D_PDU, "STANAG 5066 D_PDUs"), 3061 DLT_CHOICE(JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"), 3062 DLT_CHOICE(NFLOG, "Linux netfilter log messages"), 3063 DLT_CHOICE(NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"), 3064 DLT_CHOICE(NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"), 3065 DLT_CHOICE(IPOIB, "RFC 4391 IP-over-Infiniband"), 3066 DLT_CHOICE(MPEG_2_TS, "MPEG-2 transport stream"), 3067 DLT_CHOICE(NG40, "ng40 protocol tester Iub/Iur"), 3068 DLT_CHOICE(NFC_LLCP, "NFC LLCP PDUs with pseudo-header"), 3069 DLT_CHOICE(INFINIBAND, "InfiniBand"), 3070 DLT_CHOICE(SCTP, "SCTP"), 3071 DLT_CHOICE(USBPCAP, "USB with USBPcap header"), 3072 DLT_CHOICE(RTAC_SERIAL, "Schweitzer Engineering Laboratories RTAC packets"), 3073 DLT_CHOICE(BLUETOOTH_LE_LL, "Bluetooth Low Energy air interface"), 3074 DLT_CHOICE(NETLINK, "Linux netlink"), 3075 DLT_CHOICE(BLUETOOTH_LINUX_MONITOR, "Bluetooth Linux Monitor"), 3076 DLT_CHOICE(BLUETOOTH_BREDR_BB, "Bluetooth Basic Rate/Enhanced Data Rate baseband packets"), 3077 DLT_CHOICE(BLUETOOTH_LE_LL_WITH_PHDR, "Bluetooth Low Energy air interface with pseudo-header"), 3078 DLT_CHOICE(PROFIBUS_DL, "PROFIBUS data link layer"), 3079 DLT_CHOICE(PKTAP, "Apple DLT_PKTAP"), 3080 DLT_CHOICE(EPON, "Ethernet with 802.3 Clause 65 EPON preamble"), 3081 DLT_CHOICE(IPMI_HPM_2, "IPMI trace packets"), 3082 DLT_CHOICE(ZWAVE_R1_R2, "Z-Wave RF profile R1 and R2 packets"), 3083 DLT_CHOICE(ZWAVE_R3, "Z-Wave RF profile R3 packets"), 3084 DLT_CHOICE(WATTSTOPPER_DLM, "WattStopper Digital Lighting Management (DLM) and Legrand Nitoo Open protocol"), 3085 DLT_CHOICE(ISO_14443, "ISO 14443 messages"), 3086 DLT_CHOICE(RDS, "IEC 62106 Radio Data System groups"), 3087 DLT_CHOICE(USB_DARWIN, "USB with Darwin header"), 3088 DLT_CHOICE(OPENFLOW, "OpenBSD DLT_OPENFLOW"), 3089 DLT_CHOICE(SDLC, "IBM SDLC frames"), 3090 DLT_CHOICE(TI_LLN_SNIFFER, "TI LLN sniffer frames"), 3091 DLT_CHOICE(VSOCK, "Linux vsock"), 3092 DLT_CHOICE(NORDIC_BLE, "Nordic Semiconductor Bluetooth LE sniffer frames"), 3093 DLT_CHOICE(DOCSIS31_XRA31, "Excentis XRA-31 DOCSIS 3.1 RF sniffer frames"), 3094 DLT_CHOICE(ETHERNET_MPACKET, "802.3br mPackets"), 3095 DLT_CHOICE(DISPLAYPORT_AUX, "DisplayPort AUX channel monitoring data"), 3096 DLT_CHOICE(LINUX_SLL2, "Linux cooked v2"), 3097 DLT_CHOICE_SENTINEL 3098 }; 3099 3100 int 3101 pcap_datalink_name_to_val(const char *name) 3102 { 3103 int i; 3104 3105 for (i = 0; dlt_choices[i].name != NULL; i++) { 3106 if (pcap_strcasecmp(dlt_choices[i].name, name) == 0) 3107 return (dlt_choices[i].dlt); 3108 } 3109 return (-1); 3110 } 3111 3112 const char * 3113 pcap_datalink_val_to_name(int dlt) 3114 { 3115 int i; 3116 3117 for (i = 0; dlt_choices[i].name != NULL; i++) { 3118 if (dlt_choices[i].dlt == dlt) 3119 return (dlt_choices[i].name); 3120 } 3121 return (NULL); 3122 } 3123 3124 const char * 3125 pcap_datalink_val_to_description(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].description); 3132 } 3133 return (NULL); 3134 } 3135 3136 const char * 3137 pcap_datalink_val_to_description_or_dlt(int dlt) 3138 { 3139 static char unkbuf[40]; 3140 const char *description; 3141 3142 description = pcap_datalink_val_to_description(dlt); 3143 if (description != NULL) { 3144 return description; 3145 } else { 3146 (void)pcap_snprintf(unkbuf, sizeof(unkbuf), "DLT %u", dlt); 3147 return unkbuf; 3148 } 3149 } 3150 3151 struct tstamp_type_choice { 3152 const char *name; 3153 const char *description; 3154 int type; 3155 }; 3156 3157 static struct tstamp_type_choice tstamp_type_choices[] = { 3158 { "host", "Host", PCAP_TSTAMP_HOST }, 3159 { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC }, 3160 { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC }, 3161 { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER }, 3162 { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED }, 3163 { NULL, NULL, 0 } 3164 }; 3165 3166 int 3167 pcap_tstamp_type_name_to_val(const char *name) 3168 { 3169 int i; 3170 3171 for (i = 0; tstamp_type_choices[i].name != NULL; i++) { 3172 if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0) 3173 return (tstamp_type_choices[i].type); 3174 } 3175 return (PCAP_ERROR); 3176 } 3177 3178 const char * 3179 pcap_tstamp_type_val_to_name(int tstamp_type) 3180 { 3181 int i; 3182 3183 for (i = 0; tstamp_type_choices[i].name != NULL; i++) { 3184 if (tstamp_type_choices[i].type == tstamp_type) 3185 return (tstamp_type_choices[i].name); 3186 } 3187 return (NULL); 3188 } 3189 3190 const char * 3191 pcap_tstamp_type_val_to_description(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].description); 3198 } 3199 return (NULL); 3200 } 3201 3202 int 3203 pcap_snapshot(pcap_t *p) 3204 { 3205 if (!p->activated) 3206 return (PCAP_ERROR_NOT_ACTIVATED); 3207 return (p->snapshot); 3208 } 3209 3210 int 3211 pcap_is_swapped(pcap_t *p) 3212 { 3213 if (!p->activated) 3214 return (PCAP_ERROR_NOT_ACTIVATED); 3215 return (p->swapped); 3216 } 3217 3218 int 3219 pcap_major_version(pcap_t *p) 3220 { 3221 if (!p->activated) 3222 return (PCAP_ERROR_NOT_ACTIVATED); 3223 return (p->version_major); 3224 } 3225 3226 int 3227 pcap_minor_version(pcap_t *p) 3228 { 3229 if (!p->activated) 3230 return (PCAP_ERROR_NOT_ACTIVATED); 3231 return (p->version_minor); 3232 } 3233 3234 int 3235 pcap_bufsize(pcap_t *p) 3236 { 3237 if (!p->activated) 3238 return (PCAP_ERROR_NOT_ACTIVATED); 3239 return (p->bufsize); 3240 } 3241 3242 FILE * 3243 pcap_file(pcap_t *p) 3244 { 3245 return (p->rfile); 3246 } 3247 3248 int 3249 pcap_fileno(pcap_t *p) 3250 { 3251 #ifndef _WIN32 3252 return (p->fd); 3253 #else 3254 if (p->handle != INVALID_HANDLE_VALUE) 3255 return ((int)(DWORD)p->handle); 3256 else 3257 return (PCAP_ERROR); 3258 #endif 3259 } 3260 3261 #if !defined(_WIN32) && !defined(MSDOS) 3262 int 3263 pcap_get_selectable_fd(pcap_t *p) 3264 { 3265 return (p->selectable_fd); 3266 } 3267 3268 struct timeval * 3269 pcap_get_required_select_timeout(pcap_t *p) 3270 { 3271 return (p->required_select_timeout); 3272 } 3273 #endif 3274 3275 void 3276 pcap_perror(pcap_t *p, const char *prefix) 3277 { 3278 fprintf(stderr, "%s: %s\n", prefix, p->errbuf); 3279 } 3280 3281 char * 3282 pcap_geterr(pcap_t *p) 3283 { 3284 return (p->errbuf); 3285 } 3286 3287 int 3288 pcap_getnonblock(pcap_t *p, char *errbuf) 3289 { 3290 int ret; 3291 3292 ret = p->getnonblock_op(p); 3293 if (ret == -1) { 3294 /* 3295 * The get nonblock operation sets p->errbuf; this 3296 * function *shouldn't* have had a separate errbuf 3297 * argument, as it didn't need one, but I goofed 3298 * when adding it. 3299 * 3300 * We copy the error message to errbuf, so callers 3301 * can find it in either place. 3302 */ 3303 pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE); 3304 } 3305 return (ret); 3306 } 3307 3308 /* 3309 * Get the current non-blocking mode setting, under the assumption that 3310 * it's just the standard POSIX non-blocking flag. 3311 */ 3312 #if !defined(_WIN32) && !defined(MSDOS) 3313 int 3314 pcap_getnonblock_fd(pcap_t *p) 3315 { 3316 int fdflags; 3317 3318 fdflags = fcntl(p->fd, F_GETFL, 0); 3319 if (fdflags == -1) { 3320 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 3321 errno, "F_GETFL"); 3322 return (-1); 3323 } 3324 if (fdflags & O_NONBLOCK) 3325 return (1); 3326 else 3327 return (0); 3328 } 3329 #endif 3330 3331 int 3332 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) 3333 { 3334 int ret; 3335 3336 ret = p->setnonblock_op(p, nonblock); 3337 if (ret == -1) { 3338 /* 3339 * The set nonblock operation sets p->errbuf; this 3340 * function *shouldn't* have had a separate errbuf 3341 * argument, as it didn't need one, but I goofed 3342 * when adding it. 3343 * 3344 * We copy the error message to errbuf, so callers 3345 * can find it in either place. 3346 */ 3347 pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE); 3348 } 3349 return (ret); 3350 } 3351 3352 #if !defined(_WIN32) && !defined(MSDOS) 3353 /* 3354 * Set non-blocking mode, under the assumption that it's just the 3355 * standard POSIX non-blocking flag. (This can be called by the 3356 * per-platform non-blocking-mode routine if that routine also 3357 * needs to do some additional work.) 3358 */ 3359 int 3360 pcap_setnonblock_fd(pcap_t *p, int nonblock) 3361 { 3362 int fdflags; 3363 3364 fdflags = fcntl(p->fd, F_GETFL, 0); 3365 if (fdflags == -1) { 3366 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 3367 errno, "F_GETFL"); 3368 return (-1); 3369 } 3370 if (nonblock) 3371 fdflags |= O_NONBLOCK; 3372 else 3373 fdflags &= ~O_NONBLOCK; 3374 if (fcntl(p->fd, F_SETFL, fdflags) == -1) { 3375 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 3376 errno, "F_SETFL"); 3377 return (-1); 3378 } 3379 return (0); 3380 } 3381 #endif 3382 3383 /* 3384 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values. 3385 */ 3386 const char * 3387 pcap_statustostr(int errnum) 3388 { 3389 static char ebuf[15+10+1]; 3390 3391 switch (errnum) { 3392 3393 case PCAP_WARNING: 3394 return("Generic warning"); 3395 3396 case PCAP_WARNING_TSTAMP_TYPE_NOTSUP: 3397 return ("That type of time stamp is not supported by that device"); 3398 3399 case PCAP_WARNING_PROMISC_NOTSUP: 3400 return ("That device doesn't support promiscuous mode"); 3401 3402 case PCAP_ERROR: 3403 return("Generic error"); 3404 3405 case PCAP_ERROR_BREAK: 3406 return("Loop terminated by pcap_breakloop"); 3407 3408 case PCAP_ERROR_NOT_ACTIVATED: 3409 return("The pcap_t has not been activated"); 3410 3411 case PCAP_ERROR_ACTIVATED: 3412 return ("The setting can't be changed after the pcap_t is activated"); 3413 3414 case PCAP_ERROR_NO_SUCH_DEVICE: 3415 return ("No such device exists"); 3416 3417 case PCAP_ERROR_RFMON_NOTSUP: 3418 return ("That device doesn't support monitor mode"); 3419 3420 case PCAP_ERROR_NOT_RFMON: 3421 return ("That operation is supported only in monitor mode"); 3422 3423 case PCAP_ERROR_PERM_DENIED: 3424 return ("You don't have permission to capture on that device"); 3425 3426 case PCAP_ERROR_IFACE_NOT_UP: 3427 return ("That device is not up"); 3428 3429 case PCAP_ERROR_CANTSET_TSTAMP_TYPE: 3430 return ("That device doesn't support setting the time stamp type"); 3431 3432 case PCAP_ERROR_PROMISC_PERM_DENIED: 3433 return ("You don't have permission to capture in promiscuous mode on that device"); 3434 3435 case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP: 3436 return ("That device doesn't support that time stamp precision"); 3437 } 3438 (void)pcap_snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 3439 return(ebuf); 3440 } 3441 3442 /* 3443 * Not all systems have strerror(). 3444 */ 3445 const char * 3446 pcap_strerror(int errnum) 3447 { 3448 #ifdef HAVE_STRERROR 3449 #ifdef _WIN32 3450 static char errbuf[PCAP_ERRBUF_SIZE]; 3451 errno_t err = strerror_s(errbuf, PCAP_ERRBUF_SIZE, errnum); 3452 3453 if (err != 0) /* err = 0 if successful */ 3454 pcap_strlcpy(errbuf, "strerror_s() error", PCAP_ERRBUF_SIZE); 3455 return (errbuf); 3456 #else 3457 return (strerror(errnum)); 3458 #endif /* _WIN32 */ 3459 #else 3460 extern int sys_nerr; 3461 extern const char *const sys_errlist[]; 3462 static char errbuf[PCAP_ERRBUF_SIZE]; 3463 3464 if ((unsigned int)errnum < sys_nerr) 3465 return ((char *)sys_errlist[errnum]); 3466 (void)pcap_snprintf(errbuf, sizeof errbuf, "Unknown error: %d", errnum); 3467 return (errbuf); 3468 #endif 3469 } 3470 3471 int 3472 pcap_setfilter(pcap_t *p, struct bpf_program *fp) 3473 { 3474 return (p->setfilter_op(p, fp)); 3475 } 3476 3477 /* 3478 * Set direction flag, which controls whether we accept only incoming 3479 * packets, only outgoing packets, or both. 3480 * Note that, depending on the platform, some or all direction arguments 3481 * might not be supported. 3482 */ 3483 int 3484 pcap_setdirection(pcap_t *p, pcap_direction_t d) 3485 { 3486 if (p->setdirection_op == NULL) { 3487 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3488 "Setting direction is not implemented on this platform"); 3489 return (-1); 3490 } else 3491 return (p->setdirection_op(p, d)); 3492 } 3493 3494 int 3495 pcap_stats(pcap_t *p, struct pcap_stat *ps) 3496 { 3497 return (p->stats_op(p, ps)); 3498 } 3499 3500 #ifdef _WIN32 3501 struct pcap_stat * 3502 pcap_stats_ex(pcap_t *p, int *pcap_stat_size) 3503 { 3504 return (p->stats_ex_op(p, pcap_stat_size)); 3505 } 3506 3507 int 3508 pcap_setbuff(pcap_t *p, int dim) 3509 { 3510 return (p->setbuff_op(p, dim)); 3511 } 3512 3513 int 3514 pcap_setmode(pcap_t *p, int mode) 3515 { 3516 return (p->setmode_op(p, mode)); 3517 } 3518 3519 int 3520 pcap_setmintocopy(pcap_t *p, int size) 3521 { 3522 return (p->setmintocopy_op(p, size)); 3523 } 3524 3525 HANDLE 3526 pcap_getevent(pcap_t *p) 3527 { 3528 return (p->getevent_op(p)); 3529 } 3530 3531 int 3532 pcap_oid_get_request(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp) 3533 { 3534 return (p->oid_get_request_op(p, oid, data, lenp)); 3535 } 3536 3537 int 3538 pcap_oid_set_request(pcap_t *p, bpf_u_int32 oid, const void *data, size_t *lenp) 3539 { 3540 return (p->oid_set_request_op(p, oid, data, lenp)); 3541 } 3542 3543 pcap_send_queue * 3544 pcap_sendqueue_alloc(u_int memsize) 3545 { 3546 pcap_send_queue *tqueue; 3547 3548 /* Allocate the queue */ 3549 tqueue = (pcap_send_queue *)malloc(sizeof(pcap_send_queue)); 3550 if (tqueue == NULL){ 3551 return (NULL); 3552 } 3553 3554 /* Allocate the buffer */ 3555 tqueue->buffer = (char *)malloc(memsize); 3556 if (tqueue->buffer == NULL) { 3557 free(tqueue); 3558 return (NULL); 3559 } 3560 3561 tqueue->maxlen = memsize; 3562 tqueue->len = 0; 3563 3564 return (tqueue); 3565 } 3566 3567 void 3568 pcap_sendqueue_destroy(pcap_send_queue *queue) 3569 { 3570 free(queue->buffer); 3571 free(queue); 3572 } 3573 3574 int 3575 pcap_sendqueue_queue(pcap_send_queue *queue, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data) 3576 { 3577 if (queue->len + sizeof(struct pcap_pkthdr) + pkt_header->caplen > queue->maxlen){ 3578 return (-1); 3579 } 3580 3581 /* Copy the pcap_pkthdr header*/ 3582 memcpy(queue->buffer + queue->len, pkt_header, sizeof(struct pcap_pkthdr)); 3583 queue->len += sizeof(struct pcap_pkthdr); 3584 3585 /* copy the packet */ 3586 memcpy(queue->buffer + queue->len, pkt_data, pkt_header->caplen); 3587 queue->len += pkt_header->caplen; 3588 3589 return (0); 3590 } 3591 3592 u_int 3593 pcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync) 3594 { 3595 return (p->sendqueue_transmit_op(p, queue, sync)); 3596 } 3597 3598 int 3599 pcap_setuserbuffer(pcap_t *p, int size) 3600 { 3601 return (p->setuserbuffer_op(p, size)); 3602 } 3603 3604 int 3605 pcap_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks) 3606 { 3607 return (p->live_dump_op(p, filename, maxsize, maxpacks)); 3608 } 3609 3610 int 3611 pcap_live_dump_ended(pcap_t *p, int sync) 3612 { 3613 return (p->live_dump_ended_op(p, sync)); 3614 } 3615 3616 PAirpcapHandle 3617 pcap_get_airpcap_handle(pcap_t *p) 3618 { 3619 PAirpcapHandle handle; 3620 3621 handle = p->get_airpcap_handle_op(p); 3622 if (handle == NULL) { 3623 (void)pcap_snprintf(p->errbuf, sizeof(p->errbuf), 3624 "This isn't an AirPcap device"); 3625 } 3626 return (handle); 3627 } 3628 #endif 3629 3630 /* 3631 * On some platforms, we need to clean up promiscuous or monitor mode 3632 * when we close a device - and we want that to happen even if the 3633 * application just exits without explicitl closing devices. 3634 * On those platforms, we need to register a "close all the pcaps" 3635 * routine to be called when we exit, and need to maintain a list of 3636 * pcaps that need to be closed to clean up modes. 3637 * 3638 * XXX - not thread-safe. 3639 */ 3640 3641 /* 3642 * List of pcaps on which we've done something that needs to be 3643 * cleaned up. 3644 * If there are any such pcaps, we arrange to call "pcap_close_all()" 3645 * when we exit, and have it close all of them. 3646 */ 3647 static struct pcap *pcaps_to_close; 3648 3649 /* 3650 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to 3651 * be called on exit. 3652 */ 3653 static int did_atexit; 3654 3655 static void 3656 pcap_close_all(void) 3657 { 3658 struct pcap *handle; 3659 3660 while ((handle = pcaps_to_close) != NULL) 3661 pcap_close(handle); 3662 } 3663 3664 int 3665 pcap_do_addexit(pcap_t *p) 3666 { 3667 /* 3668 * If we haven't already done so, arrange to have 3669 * "pcap_close_all()" called when we exit. 3670 */ 3671 if (!did_atexit) { 3672 if (atexit(pcap_close_all) != 0) { 3673 /* 3674 * "atexit()" failed; let our caller know. 3675 */ 3676 pcap_strlcpy(p->errbuf, "atexit failed", PCAP_ERRBUF_SIZE); 3677 return (0); 3678 } 3679 did_atexit = 1; 3680 } 3681 return (1); 3682 } 3683 3684 void 3685 pcap_add_to_pcaps_to_close(pcap_t *p) 3686 { 3687 p->next = pcaps_to_close; 3688 pcaps_to_close = p; 3689 } 3690 3691 void 3692 pcap_remove_from_pcaps_to_close(pcap_t *p) 3693 { 3694 pcap_t *pc, *prevpc; 3695 3696 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL; 3697 prevpc = pc, pc = pc->next) { 3698 if (pc == p) { 3699 /* 3700 * Found it. Remove it from the list. 3701 */ 3702 if (prevpc == NULL) { 3703 /* 3704 * It was at the head of the list. 3705 */ 3706 pcaps_to_close = pc->next; 3707 } else { 3708 /* 3709 * It was in the middle of the list. 3710 */ 3711 prevpc->next = pc->next; 3712 } 3713 break; 3714 } 3715 } 3716 } 3717 3718 void 3719 pcap_cleanup_live_common(pcap_t *p) 3720 { 3721 if (p->buffer != NULL) { 3722 free(p->buffer); 3723 p->buffer = NULL; 3724 } 3725 if (p->dlt_list != NULL) { 3726 free(p->dlt_list); 3727 p->dlt_list = NULL; 3728 p->dlt_count = 0; 3729 } 3730 if (p->tstamp_type_list != NULL) { 3731 free(p->tstamp_type_list); 3732 p->tstamp_type_list = NULL; 3733 p->tstamp_type_count = 0; 3734 } 3735 if (p->tstamp_precision_list != NULL) { 3736 free(p->tstamp_precision_list); 3737 p->tstamp_precision_list = NULL; 3738 p->tstamp_precision_count = 0; 3739 } 3740 pcap_freecode(&p->fcode); 3741 #if !defined(_WIN32) && !defined(MSDOS) 3742 if (p->fd >= 0) { 3743 close(p->fd); 3744 p->fd = -1; 3745 } 3746 p->selectable_fd = -1; 3747 #endif 3748 } 3749 3750 /* 3751 * API compatible with WinPcap's "send a packet" routine - returns -1 3752 * on error, 0 otherwise. 3753 * 3754 * XXX - what if we get a short write? 3755 */ 3756 int 3757 pcap_sendpacket(pcap_t *p, const u_char *buf, int size) 3758 { 3759 if (p->inject_op(p, buf, size) == -1) 3760 return (-1); 3761 return (0); 3762 } 3763 3764 /* 3765 * API compatible with OpenBSD's "send a packet" routine - returns -1 on 3766 * error, number of bytes written otherwise. 3767 */ 3768 int 3769 pcap_inject(pcap_t *p, const void *buf, size_t size) 3770 { 3771 return (p->inject_op(p, buf, size)); 3772 } 3773 3774 void 3775 pcap_close(pcap_t *p) 3776 { 3777 if (p->opt.device != NULL) 3778 free(p->opt.device); 3779 p->cleanup_op(p); 3780 free(p); 3781 } 3782 3783 /* 3784 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw 3785 * data for the packet, check whether the packet passes the filter. 3786 * Returns the return value of the filter program, which will be zero if 3787 * the packet doesn't pass and non-zero if the packet does pass. 3788 */ 3789 int 3790 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h, 3791 const u_char *pkt) 3792 { 3793 const struct bpf_insn *fcode = fp->bf_insns; 3794 3795 if (fcode != NULL) 3796 return (bpf_filter(fcode, pkt, h->len, h->caplen)); 3797 else 3798 return (0); 3799 } 3800 3801 static int 3802 pcap_can_set_rfmon_dead(pcap_t *p) 3803 { 3804 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3805 "Rfmon mode doesn't apply on a pcap_open_dead pcap_t"); 3806 return (PCAP_ERROR); 3807 } 3808 3809 static int 3810 pcap_read_dead(pcap_t *p, int cnt _U_, pcap_handler callback _U_, 3811 u_char *user _U_) 3812 { 3813 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3814 "Packets aren't available from a pcap_open_dead pcap_t"); 3815 return (-1); 3816 } 3817 3818 static int 3819 pcap_inject_dead(pcap_t *p, const void *buf _U_, size_t size _U_) 3820 { 3821 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3822 "Packets can't be sent on a pcap_open_dead pcap_t"); 3823 return (-1); 3824 } 3825 3826 static int 3827 pcap_setfilter_dead(pcap_t *p, struct bpf_program *fp _U_) 3828 { 3829 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3830 "A filter cannot be set on a pcap_open_dead pcap_t"); 3831 return (-1); 3832 } 3833 3834 static int 3835 pcap_setdirection_dead(pcap_t *p, pcap_direction_t d _U_) 3836 { 3837 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3838 "The packet direction cannot be set on a pcap_open_dead pcap_t"); 3839 return (-1); 3840 } 3841 3842 static int 3843 pcap_set_datalink_dead(pcap_t *p, int dlt _U_) 3844 { 3845 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3846 "The link-layer header type cannot be set on a pcap_open_dead pcap_t"); 3847 return (-1); 3848 } 3849 3850 static int 3851 pcap_getnonblock_dead(pcap_t *p) 3852 { 3853 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3854 "A pcap_open_dead pcap_t does not have a non-blocking mode setting"); 3855 return (-1); 3856 } 3857 3858 static int 3859 pcap_setnonblock_dead(pcap_t *p, int nonblock _U_) 3860 { 3861 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3862 "A pcap_open_dead pcap_t does not have a non-blocking mode setting"); 3863 return (-1); 3864 } 3865 3866 static int 3867 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_) 3868 { 3869 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3870 "Statistics aren't available from a pcap_open_dead pcap_t"); 3871 return (-1); 3872 } 3873 3874 #ifdef _WIN32 3875 struct pcap_stat * 3876 pcap_stats_ex_dead(pcap_t *p, int *pcap_stat_size _U_) 3877 { 3878 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3879 "Statistics aren't available from a pcap_open_dead pcap_t"); 3880 return (NULL); 3881 } 3882 3883 static int 3884 pcap_setbuff_dead(pcap_t *p, int dim) 3885 { 3886 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3887 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t"); 3888 return (-1); 3889 } 3890 3891 static int 3892 pcap_setmode_dead(pcap_t *p, int mode) 3893 { 3894 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3895 "impossible to set mode on a pcap_open_dead pcap_t"); 3896 return (-1); 3897 } 3898 3899 static int 3900 pcap_setmintocopy_dead(pcap_t *p, int size) 3901 { 3902 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3903 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t"); 3904 return (-1); 3905 } 3906 3907 static HANDLE 3908 pcap_getevent_dead(pcap_t *p) 3909 { 3910 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3911 "A pcap_open_dead pcap_t has no event handle"); 3912 return (INVALID_HANDLE_VALUE); 3913 } 3914 3915 static int 3916 pcap_oid_get_request_dead(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_, 3917 size_t *lenp _U_) 3918 { 3919 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3920 "An OID get request cannot be performed on a pcap_open_dead pcap_t"); 3921 return (PCAP_ERROR); 3922 } 3923 3924 static int 3925 pcap_oid_set_request_dead(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_, 3926 size_t *lenp _U_) 3927 { 3928 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3929 "An OID set request cannot be performed on a pcap_open_dead pcap_t"); 3930 return (PCAP_ERROR); 3931 } 3932 3933 static u_int 3934 pcap_sendqueue_transmit_dead(pcap_t *p, pcap_send_queue *queue, int sync) 3935 { 3936 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3937 "Packets cannot be transmitted on a pcap_open_dead pcap_t"); 3938 return (0); 3939 } 3940 3941 static int 3942 pcap_setuserbuffer_dead(pcap_t *p, int size) 3943 { 3944 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3945 "The user buffer cannot be set on a pcap_open_dead pcap_t"); 3946 return (-1); 3947 } 3948 3949 static int 3950 pcap_live_dump_dead(pcap_t *p, char *filename, int maxsize, int maxpacks) 3951 { 3952 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3953 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t"); 3954 return (-1); 3955 } 3956 3957 static int 3958 pcap_live_dump_ended_dead(pcap_t *p, int sync) 3959 { 3960 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 3961 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t"); 3962 return (-1); 3963 } 3964 3965 static PAirpcapHandle 3966 pcap_get_airpcap_handle_dead(pcap_t *p) 3967 { 3968 return (NULL); 3969 } 3970 #endif /* _WIN32 */ 3971 3972 static void 3973 pcap_cleanup_dead(pcap_t *p _U_) 3974 { 3975 /* Nothing to do. */ 3976 } 3977 3978 pcap_t * 3979 pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision) 3980 { 3981 pcap_t *p; 3982 3983 switch (precision) { 3984 3985 case PCAP_TSTAMP_PRECISION_MICRO: 3986 case PCAP_TSTAMP_PRECISION_NANO: 3987 break; 3988 3989 default: 3990 /* 3991 * This doesn't really matter, but we don't have any way 3992 * to report particular errors, so the only failure we 3993 * should have is a memory allocation failure. Just 3994 * pick microsecond precision. 3995 */ 3996 precision = PCAP_TSTAMP_PRECISION_MICRO; 3997 break; 3998 } 3999 p = malloc(sizeof(*p)); 4000 if (p == NULL) 4001 return NULL; 4002 memset (p, 0, sizeof(*p)); 4003 p->snapshot = snaplen; 4004 p->linktype = linktype; 4005 p->opt.tstamp_precision = precision; 4006 p->can_set_rfmon_op = pcap_can_set_rfmon_dead; 4007 p->read_op = pcap_read_dead; 4008 p->inject_op = pcap_inject_dead; 4009 p->setfilter_op = pcap_setfilter_dead; 4010 p->setdirection_op = pcap_setdirection_dead; 4011 p->set_datalink_op = pcap_set_datalink_dead; 4012 p->getnonblock_op = pcap_getnonblock_dead; 4013 p->setnonblock_op = pcap_setnonblock_dead; 4014 p->stats_op = pcap_stats_dead; 4015 #ifdef _WIN32 4016 p->stats_ex_op = pcap_stats_ex_dead; 4017 p->setbuff_op = pcap_setbuff_dead; 4018 p->setmode_op = pcap_setmode_dead; 4019 p->setmintocopy_op = pcap_setmintocopy_dead; 4020 p->getevent_op = pcap_getevent_dead; 4021 p->oid_get_request_op = pcap_oid_get_request_dead; 4022 p->oid_set_request_op = pcap_oid_set_request_dead; 4023 p->sendqueue_transmit_op = pcap_sendqueue_transmit_dead; 4024 p->setuserbuffer_op = pcap_setuserbuffer_dead; 4025 p->live_dump_op = pcap_live_dump_dead; 4026 p->live_dump_ended_op = pcap_live_dump_ended_dead; 4027 p->get_airpcap_handle_op = pcap_get_airpcap_handle_dead; 4028 #endif 4029 p->cleanup_op = pcap_cleanup_dead; 4030 4031 /* 4032 * A "dead" pcap_t never requires special BPF code generation. 4033 */ 4034 p->bpf_codegen_flags = 0; 4035 4036 p->activated = 1; 4037 return (p); 4038 } 4039 4040 pcap_t * 4041 pcap_open_dead(int linktype, int snaplen) 4042 { 4043 return (pcap_open_dead_with_tstamp_precision(linktype, snaplen, 4044 PCAP_TSTAMP_PRECISION_MICRO)); 4045 } 4046 4047 #ifdef YYDEBUG 4048 /* 4049 * Set the internal "debug printout" flag for the filter expression parser. 4050 * The code to print that stuff is present only if YYDEBUG is defined, so 4051 * the flag, and the routine to set it, are defined only if YYDEBUG is 4052 * defined. 4053 * 4054 * This is intended for libpcap developers, not for general use. 4055 * If you want to set these in a program, you'll have to declare this 4056 * routine yourself, with the appropriate DLL import attribute on Windows; 4057 * it's not declared in any header file, and won't be declared in any 4058 * header file provided by libpcap. 4059 */ 4060 PCAP_API void pcap_set_parser_debug(int value); 4061 4062 PCAP_API_DEF void 4063 pcap_set_parser_debug(int value) 4064 { 4065 pcap_debug = value; 4066 } 4067 #endif 4068