1 /* 2 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the Computer Systems 16 * Engineering Group at Lawrence Berkeley Laboratory. 17 * 4. Neither the name of the University nor of the Laboratory may be used 18 * to endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char rcsid[] _U_ = 36 "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.112.2.12 2008-09-22 20:16:01 guy Exp $ (LBL)"; 37 #endif 38 39 #ifdef HAVE_CONFIG_H 40 #include "config.h" 41 #endif 42 43 #ifdef WIN32 44 #include <pcap-stdinc.h> 45 #else /* WIN32 */ 46 #include <sys/types.h> 47 #endif /* WIN32 */ 48 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #if !defined(_MSC_VER) && !defined(__BORLANDC__) 53 #include <unistd.h> 54 #endif 55 #include <fcntl.h> 56 #include <errno.h> 57 58 #ifdef HAVE_OS_PROTO_H 59 #include "os-proto.h" 60 #endif 61 62 #ifdef MSDOS 63 #include "pcap-dos.h" 64 #endif 65 66 #include "pcap-int.h" 67 68 #ifdef HAVE_DAG_API 69 #include <dagnew.h> 70 #include <dagapi.h> 71 #endif 72 73 int 74 pcap_not_initialized(pcap_t *pcap) 75 { 76 /* this means 'not initialized' */ 77 return PCAP_ERROR_NOT_ACTIVATED; 78 } 79 80 /* 81 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't, 82 * a PCAP_ERROR value on an error. 83 */ 84 int 85 pcap_can_set_rfmon(pcap_t *p) 86 { 87 return (p->can_set_rfmon_op(p)); 88 } 89 90 /* 91 * For systems where rfmon mode is never supported. 92 */ 93 static int 94 pcap_cant_set_rfmon(pcap_t *p _U_) 95 { 96 return (0); 97 } 98 99 pcap_t * 100 pcap_create_common(const char *source, char *ebuf) 101 { 102 pcap_t *p; 103 104 p = malloc(sizeof(*p)); 105 if (p == NULL) { 106 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 107 pcap_strerror(errno)); 108 return (NULL); 109 } 110 memset(p, 0, sizeof(*p)); 111 #ifndef WIN32 112 p->fd = -1; /* not opened yet */ 113 #endif 114 115 p->opt.source = strdup(source); 116 if (p->opt.source == NULL) { 117 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 118 pcap_strerror(errno)); 119 free(p); 120 return (NULL); 121 } 122 123 /* 124 * Default to "can't set rfmon mode"; if it's supported by 125 * a platform, it can set the op to its routine to check 126 * whether a particular device supports it. 127 */ 128 p->can_set_rfmon_op = pcap_cant_set_rfmon; 129 130 /* 131 * Some operations can be performed only on activated pcap_t's; 132 * have those operations handled by a "not supported" handler 133 * until the pcap_t is activated. 134 */ 135 p->read_op = (read_op_t)pcap_not_initialized; 136 p->inject_op = (inject_op_t)pcap_not_initialized; 137 p->setfilter_op = (setfilter_op_t)pcap_not_initialized; 138 p->setdirection_op = (setdirection_op_t)pcap_not_initialized; 139 p->set_datalink_op = (set_datalink_op_t)pcap_not_initialized; 140 p->getnonblock_op = (getnonblock_op_t)pcap_not_initialized; 141 p->setnonblock_op = (setnonblock_op_t)pcap_not_initialized; 142 p->stats_op = (stats_op_t)pcap_not_initialized; 143 #ifdef WIN32 144 p->setbuff_op = (setbuff_op_t)pcap_not_initialized; 145 p->setmode_op = (setmode_op_t)pcap_not_initialized; 146 p->setmintocopy_op = (setmintocopy_op_t)pcap_not_initialized; 147 #endif 148 p->cleanup_op = pcap_cleanup_live_common; 149 150 /* put in some defaults*/ 151 pcap_set_timeout(p, 0); 152 pcap_set_snaplen(p, 65535); /* max packet size */ 153 p->opt.promisc = 0; 154 p->opt.buffer_size = 0; 155 return (p); 156 } 157 158 int 159 pcap_check_activated(pcap_t *p) 160 { 161 if (p->activated) { 162 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform " 163 " operation on activated capture"); 164 return -1; 165 } 166 return 0; 167 } 168 169 int 170 pcap_set_snaplen(pcap_t *p, int snaplen) 171 { 172 if (pcap_check_activated(p)) 173 return PCAP_ERROR_ACTIVATED; 174 p->snapshot = snaplen; 175 return 0; 176 } 177 178 int 179 pcap_set_promisc(pcap_t *p, int promisc) 180 { 181 if (pcap_check_activated(p)) 182 return PCAP_ERROR_ACTIVATED; 183 p->opt.promisc = promisc; 184 return 0; 185 } 186 187 int 188 pcap_set_rfmon(pcap_t *p, int rfmon) 189 { 190 if (pcap_check_activated(p)) 191 return PCAP_ERROR_ACTIVATED; 192 p->opt.rfmon = rfmon; 193 return 0; 194 } 195 196 int 197 pcap_set_timeout(pcap_t *p, int timeout_ms) 198 { 199 if (pcap_check_activated(p)) 200 return PCAP_ERROR_ACTIVATED; 201 p->md.timeout = timeout_ms; 202 return 0; 203 } 204 205 int 206 pcap_set_buffer_size(pcap_t *p, int buffer_size) 207 { 208 if (pcap_check_activated(p)) 209 return PCAP_ERROR_ACTIVATED; 210 p->opt.buffer_size = buffer_size; 211 return 0; 212 } 213 214 int 215 pcap_activate(pcap_t *p) 216 { 217 int status; 218 219 status = p->activate_op(p); 220 if (status >= 0) 221 p->activated = 1; 222 return (status); 223 } 224 225 pcap_t * 226 pcap_open_live(const char *source, int snaplen, int promisc, int to_ms, char *errbuf) 227 { 228 pcap_t *p; 229 int status; 230 231 p = pcap_create(source, errbuf); 232 if (p == NULL) 233 return (NULL); 234 status = pcap_set_snaplen(p, snaplen); 235 if (status < 0) 236 goto fail; 237 status = pcap_set_promisc(p, promisc); 238 if (status < 0) 239 goto fail; 240 status = pcap_set_timeout(p, to_ms); 241 if (status < 0) 242 goto fail; 243 /* 244 * Mark this as opened with pcap_open_live(), so that, for 245 * example, we show the full list of DLT_ values, rather 246 * than just the ones that are compatible with capturing 247 * when not in monitor mode. That allows existing applications 248 * to work the way they used to work, but allows new applications 249 * that know about the new open API to, for example, find out the 250 * DLT_ values that they can select without changing whether 251 * the adapter is in monitor mode or not. 252 */ 253 p->oldstyle = 1; 254 status = pcap_activate(p); 255 if (status < 0) 256 goto fail; 257 return (p); 258 fail: 259 if (status == PCAP_ERROR || status == PCAP_ERROR_NO_SUCH_DEVICE || 260 status == PCAP_ERROR_PERM_DENIED) 261 strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE); 262 else 263 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source, 264 pcap_statustostr(status)); 265 pcap_close(p); 266 return (NULL); 267 } 268 269 int 270 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 271 { 272 return p->read_op(p, cnt, callback, user); 273 } 274 275 /* 276 * XXX - is this necessary? 277 */ 278 int 279 pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 280 { 281 282 return p->read_op(p, cnt, callback, user); 283 } 284 285 int 286 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 287 { 288 register int n; 289 290 for (;;) { 291 if (p->sf.rfile != NULL) { 292 /* 293 * 0 means EOF, so don't loop if we get 0. 294 */ 295 n = pcap_offline_read(p, cnt, callback, user); 296 } else { 297 /* 298 * XXX keep reading until we get something 299 * (or an error occurs) 300 */ 301 do { 302 n = p->read_op(p, cnt, callback, user); 303 } while (n == 0); 304 } 305 if (n <= 0) 306 return (n); 307 if (cnt > 0) { 308 cnt -= n; 309 if (cnt <= 0) 310 return (0); 311 } 312 } 313 } 314 315 struct singleton { 316 struct pcap_pkthdr *hdr; 317 const u_char *pkt; 318 }; 319 320 321 static void 322 pcap_oneshot(u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt) 323 { 324 struct singleton *sp = (struct singleton *)userData; 325 *sp->hdr = *h; 326 sp->pkt = pkt; 327 } 328 329 const u_char * 330 pcap_next(pcap_t *p, struct pcap_pkthdr *h) 331 { 332 struct singleton s; 333 334 s.hdr = h; 335 if (pcap_dispatch(p, 1, pcap_oneshot, (u_char*)&s) <= 0) 336 return (0); 337 return (s.pkt); 338 } 339 340 struct pkt_for_fakecallback { 341 struct pcap_pkthdr *hdr; 342 const u_char **pkt; 343 }; 344 345 static void 346 pcap_fakecallback(u_char *userData, const struct pcap_pkthdr *h, 347 const u_char *pkt) 348 { 349 struct pkt_for_fakecallback *sp = (struct pkt_for_fakecallback *)userData; 350 351 *sp->hdr = *h; 352 *sp->pkt = pkt; 353 } 354 355 int 356 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, 357 const u_char **pkt_data) 358 { 359 struct pkt_for_fakecallback s; 360 361 s.hdr = &p->pcap_header; 362 s.pkt = pkt_data; 363 364 /* Saves a pointer to the packet headers */ 365 *pkt_header= &p->pcap_header; 366 367 if (p->sf.rfile != NULL) { 368 int status; 369 370 /* We are on an offline capture */ 371 status = pcap_offline_read(p, 1, pcap_fakecallback, 372 (u_char *)&s); 373 374 /* 375 * Return codes for pcap_offline_read() are: 376 * - 0: EOF 377 * - -1: error 378 * - >1: OK 379 * The first one ('0') conflicts with the return code of 380 * 0 from pcap_read() meaning "no packets arrived before 381 * the timeout expired", so we map it to -2 so you can 382 * distinguish between an EOF from a savefile and a 383 * "no packets arrived before the timeout expired, try 384 * again" from a live capture. 385 */ 386 if (status == 0) 387 return (-2); 388 else 389 return (status); 390 } 391 392 /* 393 * Return codes for pcap_read() are: 394 * - 0: timeout 395 * - -1: error 396 * - -2: loop was broken out of with pcap_breakloop() 397 * - >1: OK 398 * The first one ('0') conflicts with the return code of 0 from 399 * pcap_offline_read() meaning "end of file". 400 */ 401 return (p->read_op(p, 1, pcap_fakecallback, (u_char *)&s)); 402 } 403 404 /* 405 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate. 406 */ 407 void 408 pcap_breakloop(pcap_t *p) 409 { 410 p->break_loop = 1; 411 } 412 413 int 414 pcap_datalink(pcap_t *p) 415 { 416 return (p->linktype); 417 } 418 419 int 420 pcap_datalink_ext(pcap_t *p) 421 { 422 return (p->linktype_ext); 423 } 424 425 int 426 pcap_list_datalinks(pcap_t *p, int **dlt_buffer) 427 { 428 if (p->dlt_count == 0) { 429 /* 430 * We couldn't fetch the list of DLTs, which means 431 * this platform doesn't support changing the 432 * DLT for an interface. Return a list of DLTs 433 * containing only the DLT this device supports. 434 */ 435 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); 436 if (*dlt_buffer == NULL) { 437 (void)snprintf(p->errbuf, sizeof(p->errbuf), 438 "malloc: %s", pcap_strerror(errno)); 439 return (-1); 440 } 441 **dlt_buffer = p->linktype; 442 return (1); 443 } else { 444 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count); 445 if (*dlt_buffer == NULL) { 446 (void)snprintf(p->errbuf, sizeof(p->errbuf), 447 "malloc: %s", pcap_strerror(errno)); 448 return (-1); 449 } 450 (void)memcpy(*dlt_buffer, p->dlt_list, 451 sizeof(**dlt_buffer) * p->dlt_count); 452 return (p->dlt_count); 453 } 454 } 455 456 /* 457 * In Windows, you might have a library built with one version of the 458 * C runtime library and an application built with another version of 459 * the C runtime library, which means that the library might use one 460 * version of malloc() and free() and the application might use another 461 * version of malloc() and free(). If so, that means something 462 * allocated by the library cannot be freed by the application, so we 463 * need to have a pcap_free_datalinks() routine to free up the list 464 * allocated by pcap_list_datalinks(), even though it's just a wrapper 465 * around free(). 466 */ 467 void 468 pcap_free_datalinks(int *dlt_list) 469 { 470 free(dlt_list); 471 } 472 473 int 474 pcap_set_datalink(pcap_t *p, int dlt) 475 { 476 int i; 477 const char *dlt_name; 478 479 if (p->dlt_count == 0 || p->set_datalink_op == NULL) { 480 /* 481 * We couldn't fetch the list of DLTs, or we don't 482 * have a "set datalink" operation, which means 483 * this platform doesn't support changing the 484 * DLT for an interface. Check whether the new 485 * DLT is the one this interface supports. 486 */ 487 if (p->linktype != dlt) 488 goto unsupported; 489 490 /* 491 * It is, so there's nothing we need to do here. 492 */ 493 return (0); 494 } 495 for (i = 0; i < p->dlt_count; i++) 496 if (p->dlt_list[i] == dlt) 497 break; 498 if (i >= p->dlt_count) 499 goto unsupported; 500 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB && 501 dlt == DLT_DOCSIS) { 502 /* 503 * This is presumably an Ethernet device, as the first 504 * link-layer type it offers is DLT_EN10MB, and the only 505 * other type it offers is DLT_DOCSIS. That means that 506 * we can't tell the driver to supply DOCSIS link-layer 507 * headers - we're just pretending that's what we're 508 * getting, as, presumably, we're capturing on a dedicated 509 * link to a Cisco Cable Modem Termination System, and 510 * it's putting raw DOCSIS frames on the wire inside low-level 511 * Ethernet framing. 512 */ 513 p->linktype = dlt; 514 return (0); 515 } 516 if (p->set_datalink_op(p, dlt) == -1) 517 return (-1); 518 p->linktype = dlt; 519 return (0); 520 521 unsupported: 522 dlt_name = pcap_datalink_val_to_name(dlt); 523 if (dlt_name != NULL) { 524 (void) snprintf(p->errbuf, sizeof(p->errbuf), 525 "%s is not one of the DLTs supported by this device", 526 dlt_name); 527 } else { 528 (void) snprintf(p->errbuf, sizeof(p->errbuf), 529 "DLT %d is not one of the DLTs supported by this device", 530 dlt); 531 } 532 return (-1); 533 } 534 535 struct dlt_choice { 536 const char *name; 537 const char *description; 538 int dlt; 539 }; 540 541 #define DLT_CHOICE(code, description) { #code, description, code } 542 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 } 543 544 static struct dlt_choice dlt_choices[] = { 545 DLT_CHOICE(DLT_NULL, "BSD loopback"), 546 DLT_CHOICE(DLT_EN10MB, "Ethernet"), 547 DLT_CHOICE(DLT_IEEE802, "Token ring"), 548 DLT_CHOICE(DLT_ARCNET, "BSD ARCNET"), 549 DLT_CHOICE(DLT_SLIP, "SLIP"), 550 DLT_CHOICE(DLT_PPP, "PPP"), 551 DLT_CHOICE(DLT_FDDI, "FDDI"), 552 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"), 553 DLT_CHOICE(DLT_RAW, "Raw IP"), 554 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"), 555 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"), 556 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"), 557 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"), 558 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"), 559 DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"), 560 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"), 561 DLT_CHOICE(DLT_IEEE802_11, "802.11"), 562 DLT_CHOICE(DLT_FRELAY, "Frame Relay"), 563 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"), 564 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"), 565 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"), 566 DLT_CHOICE(DLT_LTALK, "Localtalk"), 567 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"), 568 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"), 569 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"), 570 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"), 571 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radiotap header"), 572 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"), 573 DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"), 574 DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"), 575 DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"), 576 DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"), 577 DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"), 578 DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"), 579 DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"), 580 DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"), 581 DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"), 582 DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"), 583 DLT_CHOICE(DLT_MTP2, "SS7 MTP2"), 584 DLT_CHOICE(DLT_MTP3, "SS7 MTP3"), 585 DLT_CHOICE(DLT_SCCP, "SS7 SCCP"), 586 DLT_CHOICE(DLT_DOCSIS, "DOCSIS"), 587 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"), 588 DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"), 589 DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"), 590 DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"), 591 DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"), 592 DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"), 593 DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"), 594 DLT_CHOICE(DLT_GPF_T, "GPF-T"), 595 DLT_CHOICE(DLT_GPF_F, "GPF-F"), 596 DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"), 597 DLT_CHOICE(DLT_ERF_ETH, "Ethernet with Endace ERF header"), 598 DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"), 599 DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"), 600 DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"), 601 DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"), 602 DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"), 603 DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"), 604 DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"), 605 DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"), 606 DLT_CHOICE(DLT_A429, "Arinc 429"), 607 DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"), 608 DLT_CHOICE(DLT_USB, "USB"), 609 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"), 610 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"), 611 DLT_CHOICE(DLT_USB_LINUX, "USB with Linux header"), 612 DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"), 613 DLT_CHOICE(DLT_IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"), 614 DLT_CHOICE(DLT_PPI, "Per-Packet Information"), 615 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"), 616 DLT_CHOICE(DLT_JUNIPER_ISM, "Juniper Integrated Service Module"), 617 DLT_CHOICE(DLT_IEEE802_15_4, "IEEE 802.15.4"), 618 DLT_CHOICE(DLT_SITA, "SITA pseudo-header"), 619 DLT_CHOICE(DLT_ERF, "Endace ERF header"), 620 DLT_CHOICE(DLT_RAIF1, "Ethernet with u10 Networks pseudo-header"), 621 DLT_CHOICE(DLT_IPMB, "IPMB"), 622 DLT_CHOICE(DLT_JUNIPER_ST, "Juniper Secure Tunnel"), 623 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"), 624 DLT_CHOICE(DLT_AX25_KISS, "AX.25 with KISS header"), 625 DLT_CHOICE(DLT_IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"), 626 DLT_CHOICE_SENTINEL 627 }; 628 629 /* 630 * This array is designed for mapping upper and lower case letter 631 * together for a case independent comparison. The mappings are 632 * based upon ascii character sequences. 633 */ 634 static const u_char charmap[] = { 635 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003', 636 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007', 637 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013', 638 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017', 639 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023', 640 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027', 641 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033', 642 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037', 643 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043', 644 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047', 645 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053', 646 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057', 647 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063', 648 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067', 649 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073', 650 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077', 651 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143', 652 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 653 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 654 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 655 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 656 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 657 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133', 658 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137', 659 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143', 660 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 661 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 662 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 663 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 664 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 665 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173', 666 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177', 667 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203', 668 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207', 669 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213', 670 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217', 671 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223', 672 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227', 673 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233', 674 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237', 675 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243', 676 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247', 677 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253', 678 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257', 679 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263', 680 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267', 681 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273', 682 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277', 683 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343', 684 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 685 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 686 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 687 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 688 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 689 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333', 690 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337', 691 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343', 692 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 693 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 694 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 695 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 696 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 697 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373', 698 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377', 699 }; 700 701 int 702 pcap_strcasecmp(const char *s1, const char *s2) 703 { 704 register const u_char *cm = charmap, 705 *us1 = (const u_char *)s1, 706 *us2 = (const u_char *)s2; 707 708 while (cm[*us1] == cm[*us2++]) 709 if (*us1++ == '\0') 710 return(0); 711 return (cm[*us1] - cm[*--us2]); 712 } 713 714 int 715 pcap_datalink_name_to_val(const char *name) 716 { 717 int i; 718 719 for (i = 0; dlt_choices[i].name != NULL; i++) { 720 if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1, 721 name) == 0) 722 return (dlt_choices[i].dlt); 723 } 724 return (-1); 725 } 726 727 const char * 728 pcap_datalink_val_to_name(int dlt) 729 { 730 int i; 731 732 for (i = 0; dlt_choices[i].name != NULL; i++) { 733 if (dlt_choices[i].dlt == dlt) 734 return (dlt_choices[i].name + sizeof("DLT_") - 1); 735 } 736 return (NULL); 737 } 738 739 const char * 740 pcap_datalink_val_to_description(int dlt) 741 { 742 int i; 743 744 for (i = 0; dlt_choices[i].name != NULL; i++) { 745 if (dlt_choices[i].dlt == dlt) 746 return (dlt_choices[i].description); 747 } 748 return (NULL); 749 } 750 751 int 752 pcap_snapshot(pcap_t *p) 753 { 754 return (p->snapshot); 755 } 756 757 int 758 pcap_is_swapped(pcap_t *p) 759 { 760 return (p->sf.swapped); 761 } 762 763 int 764 pcap_major_version(pcap_t *p) 765 { 766 return (p->sf.version_major); 767 } 768 769 int 770 pcap_minor_version(pcap_t *p) 771 { 772 return (p->sf.version_minor); 773 } 774 775 FILE * 776 pcap_file(pcap_t *p) 777 { 778 return (p->sf.rfile); 779 } 780 781 int 782 pcap_fileno(pcap_t *p) 783 { 784 #ifndef WIN32 785 return (p->fd); 786 #else 787 if (p->adapter != NULL) 788 return ((int)(DWORD)p->adapter->hFile); 789 else 790 return (-1); 791 #endif 792 } 793 794 #if !defined(WIN32) && !defined(MSDOS) 795 int 796 pcap_get_selectable_fd(pcap_t *p) 797 { 798 return (p->selectable_fd); 799 } 800 #endif 801 802 void 803 pcap_perror(pcap_t *p, char *prefix) 804 { 805 fprintf(stderr, "%s: %s\n", prefix, p->errbuf); 806 } 807 808 char * 809 pcap_geterr(pcap_t *p) 810 { 811 return (p->errbuf); 812 } 813 814 int 815 pcap_getnonblock(pcap_t *p, char *errbuf) 816 { 817 return p->getnonblock_op(p, errbuf); 818 } 819 820 /* 821 * Get the current non-blocking mode setting, under the assumption that 822 * it's just the standard POSIX non-blocking flag. 823 * 824 * We don't look at "p->nonblock", in case somebody tweaked the FD 825 * directly. 826 */ 827 #if !defined(WIN32) && !defined(MSDOS) 828 int 829 pcap_getnonblock_fd(pcap_t *p, char *errbuf) 830 { 831 int fdflags; 832 833 fdflags = fcntl(p->fd, F_GETFL, 0); 834 if (fdflags == -1) { 835 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 836 pcap_strerror(errno)); 837 return (-1); 838 } 839 if (fdflags & O_NONBLOCK) 840 return (1); 841 else 842 return (0); 843 } 844 #endif 845 846 int 847 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) 848 { 849 return p->setnonblock_op(p, nonblock, errbuf); 850 } 851 852 #if !defined(WIN32) && !defined(MSDOS) 853 /* 854 * Set non-blocking mode, under the assumption that it's just the 855 * standard POSIX non-blocking flag. (This can be called by the 856 * per-platform non-blocking-mode routine if that routine also 857 * needs to do some additional work.) 858 */ 859 int 860 pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf) 861 { 862 int fdflags; 863 864 fdflags = fcntl(p->fd, F_GETFL, 0); 865 if (fdflags == -1) { 866 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 867 pcap_strerror(errno)); 868 return (-1); 869 } 870 if (nonblock) 871 fdflags |= O_NONBLOCK; 872 else 873 fdflags &= ~O_NONBLOCK; 874 if (fcntl(p->fd, F_SETFL, fdflags) == -1) { 875 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s", 876 pcap_strerror(errno)); 877 return (-1); 878 } 879 return (0); 880 } 881 #endif 882 883 #ifdef WIN32 884 /* 885 * Generate a string for the last Win32-specific error (i.e. an error generated when 886 * calling a Win32 API). 887 * For errors occurred during standard C calls, we still use pcap_strerror() 888 */ 889 char * 890 pcap_win32strerror(void) 891 { 892 DWORD error; 893 static char errbuf[PCAP_ERRBUF_SIZE+1]; 894 int errlen; 895 char *p; 896 897 error = GetLastError(); 898 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf, 899 PCAP_ERRBUF_SIZE, NULL); 900 901 /* 902 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the 903 * message. Get rid of it. 904 */ 905 errlen = strlen(errbuf); 906 if (errlen >= 2) { 907 errbuf[errlen - 1] = '\0'; 908 errbuf[errlen - 2] = '\0'; 909 } 910 p = strchr(errbuf, '\0'); 911 snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error); 912 return (errbuf); 913 } 914 #endif 915 916 /* 917 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values. 918 */ 919 const char * 920 pcap_statustostr(int errnum) 921 { 922 static char ebuf[15+10+1]; 923 924 switch (errnum) { 925 926 case PCAP_WARNING: 927 return("Generic warning"); 928 929 case PCAP_WARNING_PROMISC_NOTSUP: 930 return ("That device doesn't support promiscuous mode"); 931 932 case PCAP_ERROR: 933 return("Generic error"); 934 935 case PCAP_ERROR_BREAK: 936 return("Loop terminated by pcap_breakloop"); 937 938 case PCAP_ERROR_NOT_ACTIVATED: 939 return("The pcap_t has not been activated"); 940 941 case PCAP_ERROR_ACTIVATED: 942 return ("The setting can't be changed after the pcap_t is activated"); 943 944 case PCAP_ERROR_NO_SUCH_DEVICE: 945 return ("No such device exists"); 946 947 case PCAP_ERROR_RFMON_NOTSUP: 948 return ("That device doesn't support monitor mode"); 949 950 case PCAP_ERROR_NOT_RFMON: 951 return ("That operation is supported only in monitor mode"); 952 953 case PCAP_ERROR_PERM_DENIED: 954 return ("You don't have permission to capture on that device"); 955 956 case PCAP_ERROR_IFACE_NOT_UP: 957 return ("That device is not up"); 958 } 959 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 960 return(ebuf); 961 } 962 963 /* 964 * Not all systems have strerror(). 965 */ 966 const char * 967 pcap_strerror(int errnum) 968 { 969 #ifdef HAVE_STRERROR 970 return (strerror(errnum)); 971 #else 972 extern int sys_nerr; 973 extern const char *const sys_errlist[]; 974 static char ebuf[15+10+1]; 975 976 if ((unsigned int)errnum < sys_nerr) 977 return ((char *)sys_errlist[errnum]); 978 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 979 return(ebuf); 980 #endif 981 } 982 983 int 984 pcap_setfilter(pcap_t *p, struct bpf_program *fp) 985 { 986 return p->setfilter_op(p, fp); 987 } 988 989 /* 990 * Set direction flag, which controls whether we accept only incoming 991 * packets, only outgoing packets, or both. 992 * Note that, depending on the platform, some or all direction arguments 993 * might not be supported. 994 */ 995 int 996 pcap_setdirection(pcap_t *p, pcap_direction_t d) 997 { 998 if (p->setdirection_op == NULL) { 999 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1000 "Setting direction is not implemented on this platform"); 1001 return -1; 1002 } else 1003 return p->setdirection_op(p, d); 1004 } 1005 1006 int 1007 pcap_stats(pcap_t *p, struct pcap_stat *ps) 1008 { 1009 return p->stats_op(p, ps); 1010 } 1011 1012 static int 1013 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_) 1014 { 1015 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1016 "Statistics aren't available from a pcap_open_dead pcap_t"); 1017 return (-1); 1018 } 1019 1020 #ifdef WIN32 1021 int 1022 pcap_setbuff(pcap_t *p, int dim) 1023 { 1024 return p->setbuff_op(p, dim); 1025 } 1026 1027 static int 1028 pcap_setbuff_dead(pcap_t *p, int dim) 1029 { 1030 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1031 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t"); 1032 return (-1); 1033 } 1034 1035 int 1036 pcap_setmode(pcap_t *p, int mode) 1037 { 1038 return p->setmode_op(p, mode); 1039 } 1040 1041 static int 1042 pcap_setmode_dead(pcap_t *p, int mode) 1043 { 1044 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1045 "impossible to set mode on a pcap_open_dead pcap_t"); 1046 return (-1); 1047 } 1048 1049 int 1050 pcap_setmintocopy(pcap_t *p, int size) 1051 { 1052 return p->setmintocopy_op(p, size); 1053 } 1054 1055 static int 1056 pcap_setmintocopy_dead(pcap_t *p, int size) 1057 { 1058 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1059 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t"); 1060 return (-1); 1061 } 1062 #endif 1063 1064 /* 1065 * On some platforms, we need to clean up promiscuous or monitor mode 1066 * when we close a device - and we want that to happen even if the 1067 * application just exits without explicitl closing devices. 1068 * On those platforms, we need to register a "close all the pcaps" 1069 * routine to be called when we exit, and need to maintain a list of 1070 * pcaps that need to be closed to clean up modes. 1071 * 1072 * XXX - not thread-safe. 1073 */ 1074 1075 /* 1076 * List of pcaps on which we've done something that needs to be 1077 * cleaned up. 1078 * If there are any such pcaps, we arrange to call "pcap_close_all()" 1079 * when we exit, and have it close all of them. 1080 */ 1081 static struct pcap *pcaps_to_close; 1082 1083 /* 1084 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to 1085 * be called on exit. 1086 */ 1087 static int did_atexit; 1088 1089 static void 1090 pcap_close_all(void) 1091 { 1092 struct pcap *handle; 1093 1094 while ((handle = pcaps_to_close) != NULL) 1095 pcap_close(handle); 1096 } 1097 1098 int 1099 pcap_do_addexit(pcap_t *p) 1100 { 1101 /* 1102 * If we haven't already done so, arrange to have 1103 * "pcap_close_all()" called when we exit. 1104 */ 1105 if (!did_atexit) { 1106 if (atexit(pcap_close_all) == -1) { 1107 /* 1108 * "atexit()" failed; let our caller know. 1109 */ 1110 strncpy(p->errbuf, "atexit failed", 1111 PCAP_ERRBUF_SIZE); 1112 return (0); 1113 } 1114 did_atexit = 1; 1115 } 1116 return (1); 1117 } 1118 1119 void 1120 pcap_add_to_pcaps_to_close(pcap_t *p) 1121 { 1122 p->md.next = pcaps_to_close; 1123 pcaps_to_close = p; 1124 } 1125 1126 void 1127 pcap_remove_from_pcaps_to_close(pcap_t *p) 1128 { 1129 pcap_t *pc, *prevpc; 1130 1131 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL; 1132 prevpc = pc, pc = pc->md.next) { 1133 if (pc == p) { 1134 /* 1135 * Found it. Remove it from the list. 1136 */ 1137 if (prevpc == NULL) { 1138 /* 1139 * It was at the head of the list. 1140 */ 1141 pcaps_to_close = pc->md.next; 1142 } else { 1143 /* 1144 * It was in the middle of the list. 1145 */ 1146 prevpc->md.next = pc->md.next; 1147 } 1148 break; 1149 } 1150 } 1151 } 1152 1153 void 1154 pcap_cleanup_live_common(pcap_t *p) 1155 { 1156 if (p->buffer != NULL) { 1157 free(p->buffer); 1158 p->buffer = NULL; 1159 } 1160 if (p->dlt_list != NULL) { 1161 free(p->dlt_list); 1162 p->dlt_list = NULL; 1163 p->dlt_count = 0; 1164 } 1165 pcap_freecode(&p->fcode); 1166 #if !defined(WIN32) && !defined(MSDOS) 1167 if (p->fd >= 0) { 1168 close(p->fd); 1169 p->fd = -1; 1170 } 1171 #endif 1172 } 1173 1174 static void 1175 pcap_cleanup_dead(pcap_t *p _U_) 1176 { 1177 /* Nothing to do. */ 1178 } 1179 1180 pcap_t * 1181 pcap_open_dead(int linktype, int snaplen) 1182 { 1183 pcap_t *p; 1184 1185 p = malloc(sizeof(*p)); 1186 if (p == NULL) 1187 return NULL; 1188 memset (p, 0, sizeof(*p)); 1189 p->snapshot = snaplen; 1190 p->linktype = linktype; 1191 p->stats_op = pcap_stats_dead; 1192 #ifdef WIN32 1193 p->setbuff_op = pcap_setbuff_dead; 1194 p->setmode_op = pcap_setmode_dead; 1195 p->setmintocopy_op = pcap_setmintocopy_dead; 1196 #endif 1197 p->cleanup_op = pcap_cleanup_dead; 1198 p->activated = 1; 1199 return p; 1200 } 1201 1202 /* 1203 * API compatible with WinPcap's "send a packet" routine - returns -1 1204 * on error, 0 otherwise. 1205 * 1206 * XXX - what if we get a short write? 1207 */ 1208 int 1209 pcap_sendpacket(pcap_t *p, const u_char *buf, int size) 1210 { 1211 if (p->inject_op(p, buf, size) == -1) 1212 return (-1); 1213 return (0); 1214 } 1215 1216 /* 1217 * API compatible with OpenBSD's "send a packet" routine - returns -1 on 1218 * error, number of bytes written otherwise. 1219 */ 1220 int 1221 pcap_inject(pcap_t *p, const void *buf, size_t size) 1222 { 1223 return (p->inject_op(p, buf, size)); 1224 } 1225 1226 void 1227 pcap_close(pcap_t *p) 1228 { 1229 if (p->opt.source != NULL) 1230 free(p->opt.source); 1231 p->cleanup_op(p); 1232 free(p); 1233 } 1234 1235 /* 1236 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw 1237 * data for the packet, check whether the packet passes the filter. 1238 * Returns the return value of the filter program, which will be zero if 1239 * the packet doesn't pass and non-zero if the packet does pass. 1240 */ 1241 int 1242 pcap_offline_filter(struct bpf_program *fp, const struct pcap_pkthdr *h, 1243 const u_char *pkt) 1244 { 1245 struct bpf_insn *fcode = fp->bf_insns; 1246 1247 if (fcode != NULL) 1248 return (bpf_filter(fcode, pkt, h->len, h->caplen)); 1249 else 1250 return (0); 1251 } 1252 1253 /* 1254 * We make the version string static, and return a pointer to it, rather 1255 * than exporting the version string directly. On at least some UNIXes, 1256 * if you import data from a shared library into an program, the data is 1257 * bound into the program binary, so if the string in the version of the 1258 * library with which the program was linked isn't the same as the 1259 * string in the version of the library with which the program is being 1260 * run, various undesirable things may happen (warnings, the string 1261 * being the one from the version of the library with which the program 1262 * was linked, or even weirder things, such as the string being the one 1263 * from the library but being truncated). 1264 */ 1265 #ifdef HAVE_VERSION_H 1266 #include "version.h" 1267 #else 1268 static const char pcap_version_string[] = "libpcap version 0.9[.x]"; 1269 #endif 1270 1271 #ifdef WIN32 1272 /* 1273 * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap 1274 * version numbers when building WinPcap. (It'd be nice to do so for 1275 * the packet.dll version number as well.) 1276 */ 1277 static const char wpcap_version_string[] = "4.0"; 1278 static const char pcap_version_string_fmt[] = 1279 "WinPcap version %s, based on %s"; 1280 static const char pcap_version_string_packet_dll_fmt[] = 1281 "WinPcap version %s (packet.dll version %s), based on %s"; 1282 static char *full_pcap_version_string; 1283 1284 const char * 1285 pcap_lib_version(void) 1286 { 1287 char *packet_version_string; 1288 size_t full_pcap_version_string_len; 1289 1290 if (full_pcap_version_string == NULL) { 1291 /* 1292 * Generate the version string. 1293 */ 1294 packet_version_string = PacketGetVersion(); 1295 if (strcmp(wpcap_version_string, packet_version_string) == 0) { 1296 /* 1297 * WinPcap version string and packet.dll version 1298 * string are the same; just report the WinPcap 1299 * version. 1300 */ 1301 full_pcap_version_string_len = 1302 (sizeof pcap_version_string_fmt - 4) + 1303 strlen(wpcap_version_string) + 1304 strlen(pcap_version_string); 1305 full_pcap_version_string = 1306 malloc(full_pcap_version_string_len); 1307 sprintf(full_pcap_version_string, 1308 pcap_version_string_fmt, wpcap_version_string, 1309 pcap_version_string); 1310 } else { 1311 /* 1312 * WinPcap version string and packet.dll version 1313 * string are different; that shouldn't be the 1314 * case (the two libraries should come from the 1315 * same version of WinPcap), so we report both 1316 * versions. 1317 */ 1318 full_pcap_version_string_len = 1319 (sizeof pcap_version_string_packet_dll_fmt - 6) + 1320 strlen(wpcap_version_string) + 1321 strlen(packet_version_string) + 1322 strlen(pcap_version_string); 1323 full_pcap_version_string = malloc(full_pcap_version_string_len); 1324 1325 sprintf(full_pcap_version_string, 1326 pcap_version_string_packet_dll_fmt, 1327 wpcap_version_string, packet_version_string, 1328 pcap_version_string); 1329 } 1330 } 1331 return (full_pcap_version_string); 1332 } 1333 1334 #elif defined(MSDOS) 1335 1336 static char *full_pcap_version_string; 1337 1338 const char * 1339 pcap_lib_version (void) 1340 { 1341 char *packet_version_string; 1342 size_t full_pcap_version_string_len; 1343 static char dospfx[] = "DOS-"; 1344 1345 if (full_pcap_version_string == NULL) { 1346 /* 1347 * Generate the version string. 1348 */ 1349 full_pcap_version_string_len = 1350 sizeof dospfx + strlen(pcap_version_string); 1351 full_pcap_version_string = 1352 malloc(full_pcap_version_string_len); 1353 strcpy(full_pcap_version_string, dospfx); 1354 strcat(full_pcap_version_string, pcap_version_string); 1355 } 1356 return (full_pcap_version_string); 1357 } 1358 1359 #else /* UN*X */ 1360 1361 const char * 1362 pcap_lib_version(void) 1363 { 1364 return (pcap_version_string); 1365 } 1366 #endif 1367