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 #include <sys/mman.h> 48 #endif /* WIN32 */ 49 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #if !defined(_MSC_VER) && !defined(__BORLANDC__) 54 #include <unistd.h> 55 #endif 56 #include <fcntl.h> 57 #include <errno.h> 58 59 #ifdef HAVE_OS_PROTO_H 60 #include "os-proto.h" 61 #endif 62 63 #ifdef MSDOS 64 #include "pcap-dos.h" 65 #endif 66 67 #include "pcap-int.h" 68 69 #ifdef HAVE_DAG_API 70 #include <dagnew.h> 71 #include <dagapi.h> 72 #endif 73 74 int 75 pcap_not_initialized(pcap_t *pcap) 76 { 77 /* this means 'not initialized' */ 78 return PCAP_ERROR_NOT_ACTIVATED; 79 } 80 81 /* 82 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't, 83 * a PCAP_ERROR value on an error. 84 */ 85 int 86 pcap_can_set_rfmon(pcap_t *p) 87 { 88 return (p->can_set_rfmon_op(p)); 89 } 90 91 /* 92 * For systems where rfmon mode is never supported. 93 */ 94 static int 95 pcap_cant_set_rfmon(pcap_t *p _U_) 96 { 97 return (0); 98 } 99 100 pcap_t * 101 pcap_create_common(const char *source, char *ebuf) 102 { 103 pcap_t *p; 104 105 p = malloc(sizeof(*p)); 106 if (p == NULL) { 107 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 108 pcap_strerror(errno)); 109 return (NULL); 110 } 111 memset(p, 0, sizeof(*p)); 112 #ifndef WIN32 113 p->fd = -1; /* not opened yet */ 114 #endif 115 116 p->opt.source = strdup(source); 117 if (p->opt.source == NULL) { 118 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 119 pcap_strerror(errno)); 120 free(p); 121 return (NULL); 122 } 123 124 /* 125 * Default to "can't set rfmon mode"; if it's supported by 126 * a platform, it can set the op to its routine to check 127 * whether a particular device supports it. 128 */ 129 p->can_set_rfmon_op = pcap_cant_set_rfmon; 130 131 /* 132 * Some operations can be performed only on activated pcap_t's; 133 * have those operations handled by a "not supported" handler 134 * until the pcap_t is activated. 135 */ 136 p->read_op = (read_op_t)pcap_not_initialized; 137 p->inject_op = (inject_op_t)pcap_not_initialized; 138 p->setfilter_op = (setfilter_op_t)pcap_not_initialized; 139 p->setdirection_op = (setdirection_op_t)pcap_not_initialized; 140 p->set_datalink_op = (set_datalink_op_t)pcap_not_initialized; 141 p->getnonblock_op = (getnonblock_op_t)pcap_not_initialized; 142 p->setnonblock_op = (setnonblock_op_t)pcap_not_initialized; 143 p->stats_op = (stats_op_t)pcap_not_initialized; 144 #ifdef WIN32 145 p->setbuff_op = (setbuff_op_t)pcap_not_initialized; 146 p->setmode_op = (setmode_op_t)pcap_not_initialized; 147 p->setmintocopy_op = (setmintocopy_op_t)pcap_not_initialized; 148 #endif 149 p->cleanup_op = pcap_cleanup_live_common; 150 151 /* put in some defaults*/ 152 pcap_set_timeout(p, 0); 153 pcap_set_snaplen(p, 65535); /* max packet size */ 154 p->opt.promisc = 0; 155 p->opt.buffer_size = 0; 156 return (p); 157 } 158 159 int 160 pcap_check_activated(pcap_t *p) 161 { 162 if (p->activated) { 163 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform " 164 " operation on activated capture"); 165 return -1; 166 } 167 return 0; 168 } 169 170 int 171 pcap_set_snaplen(pcap_t *p, int snaplen) 172 { 173 if (pcap_check_activated(p)) 174 return PCAP_ERROR_ACTIVATED; 175 p->snapshot = snaplen; 176 return 0; 177 } 178 179 int 180 pcap_set_promisc(pcap_t *p, int promisc) 181 { 182 if (pcap_check_activated(p)) 183 return PCAP_ERROR_ACTIVATED; 184 p->opt.promisc = promisc; 185 return 0; 186 } 187 188 int 189 pcap_set_rfmon(pcap_t *p, int rfmon) 190 { 191 if (pcap_check_activated(p)) 192 return PCAP_ERROR_ACTIVATED; 193 p->opt.rfmon = rfmon; 194 return 0; 195 } 196 197 int 198 pcap_set_timeout(pcap_t *p, int timeout_ms) 199 { 200 if (pcap_check_activated(p)) 201 return PCAP_ERROR_ACTIVATED; 202 p->md.timeout = timeout_ms; 203 return 0; 204 } 205 206 int 207 pcap_set_buffer_size(pcap_t *p, int buffer_size) 208 { 209 if (pcap_check_activated(p)) 210 return PCAP_ERROR_ACTIVATED; 211 p->opt.buffer_size = buffer_size; 212 return 0; 213 } 214 215 int 216 pcap_activate(pcap_t *p) 217 { 218 int status; 219 220 status = p->activate_op(p); 221 if (status >= 0) 222 p->activated = 1; 223 return (status); 224 } 225 226 pcap_t * 227 pcap_open_live(const char *source, int snaplen, int promisc, int to_ms, char *errbuf) 228 { 229 pcap_t *p; 230 int status; 231 232 p = pcap_create(source, errbuf); 233 if (p == NULL) 234 return (NULL); 235 status = pcap_set_snaplen(p, snaplen); 236 if (status < 0) 237 goto fail; 238 status = pcap_set_promisc(p, promisc); 239 if (status < 0) 240 goto fail; 241 status = pcap_set_timeout(p, to_ms); 242 if (status < 0) 243 goto fail; 244 /* 245 * Mark this as opened with pcap_open_live(), so that, for 246 * example, we show the full list of DLT_ values, rather 247 * than just the ones that are compatible with capturing 248 * when not in monitor mode. That allows existing applications 249 * to work the way they used to work, but allows new applications 250 * that know about the new open API to, for example, find out the 251 * DLT_ values that they can select without changing whether 252 * the adapter is in monitor mode or not. 253 */ 254 p->oldstyle = 1; 255 status = pcap_activate(p); 256 if (status < 0) 257 goto fail; 258 return (p); 259 fail: 260 if (status == PCAP_ERROR || status == PCAP_ERROR_NO_SUCH_DEVICE || 261 status == PCAP_ERROR_PERM_DENIED) 262 strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE); 263 else 264 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source, 265 pcap_statustostr(status)); 266 pcap_close(p); 267 return (NULL); 268 } 269 270 int 271 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 272 { 273 return p->read_op(p, cnt, callback, user); 274 } 275 276 /* 277 * XXX - is this necessary? 278 */ 279 int 280 pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 281 { 282 283 return p->read_op(p, cnt, callback, user); 284 } 285 286 int 287 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 288 { 289 register int n; 290 291 for (;;) { 292 if (p->sf.rfile != NULL) { 293 /* 294 * 0 means EOF, so don't loop if we get 0. 295 */ 296 n = pcap_offline_read(p, cnt, callback, user); 297 } else { 298 /* 299 * XXX keep reading until we get something 300 * (or an error occurs) 301 */ 302 do { 303 n = p->read_op(p, cnt, callback, user); 304 } while (n == 0); 305 } 306 if (n <= 0) 307 return (n); 308 if (cnt > 0) { 309 cnt -= n; 310 if (cnt <= 0) 311 return (0); 312 } 313 } 314 } 315 316 struct singleton { 317 struct pcap_pkthdr *hdr; 318 const u_char *pkt; 319 }; 320 321 322 static void 323 pcap_oneshot(u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt) 324 { 325 struct singleton *sp = (struct singleton *)userData; 326 *sp->hdr = *h; 327 sp->pkt = pkt; 328 } 329 330 const u_char * 331 pcap_next(pcap_t *p, struct pcap_pkthdr *h) 332 { 333 struct singleton s; 334 335 s.hdr = h; 336 if (pcap_dispatch(p, 1, pcap_oneshot, (u_char*)&s) <= 0) 337 return (0); 338 return (s.pkt); 339 } 340 341 struct pkt_for_fakecallback { 342 struct pcap_pkthdr *hdr; 343 const u_char **pkt; 344 }; 345 346 static void 347 pcap_fakecallback(u_char *userData, const struct pcap_pkthdr *h, 348 const u_char *pkt) 349 { 350 struct pkt_for_fakecallback *sp = (struct pkt_for_fakecallback *)userData; 351 352 *sp->hdr = *h; 353 *sp->pkt = pkt; 354 } 355 356 int 357 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, 358 const u_char **pkt_data) 359 { 360 struct pkt_for_fakecallback s; 361 362 s.hdr = &p->pcap_header; 363 s.pkt = pkt_data; 364 365 /* Saves a pointer to the packet headers */ 366 *pkt_header= &p->pcap_header; 367 368 if (p->sf.rfile != NULL) { 369 int status; 370 371 /* We are on an offline capture */ 372 status = pcap_offline_read(p, 1, pcap_fakecallback, 373 (u_char *)&s); 374 375 /* 376 * Return codes for pcap_offline_read() are: 377 * - 0: EOF 378 * - -1: error 379 * - >1: OK 380 * The first one ('0') conflicts with the return code of 381 * 0 from pcap_read() meaning "no packets arrived before 382 * the timeout expired", so we map it to -2 so you can 383 * distinguish between an EOF from a savefile and a 384 * "no packets arrived before the timeout expired, try 385 * again" from a live capture. 386 */ 387 if (status == 0) 388 return (-2); 389 else 390 return (status); 391 } 392 393 /* 394 * Return codes for pcap_read() are: 395 * - 0: timeout 396 * - -1: error 397 * - -2: loop was broken out of with pcap_breakloop() 398 * - >1: OK 399 * The first one ('0') conflicts with the return code of 0 from 400 * pcap_offline_read() meaning "end of file". 401 */ 402 return (p->read_op(p, 1, pcap_fakecallback, (u_char *)&s)); 403 } 404 405 /* 406 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate. 407 */ 408 void 409 pcap_breakloop(pcap_t *p) 410 { 411 p->break_loop = 1; 412 } 413 414 int 415 pcap_datalink(pcap_t *p) 416 { 417 return (p->linktype); 418 } 419 420 int 421 pcap_datalink_ext(pcap_t *p) 422 { 423 return (p->linktype_ext); 424 } 425 426 int 427 pcap_list_datalinks(pcap_t *p, int **dlt_buffer) 428 { 429 if (p->dlt_count == 0) { 430 /* 431 * We couldn't fetch the list of DLTs, which means 432 * this platform doesn't support changing the 433 * DLT for an interface. Return a list of DLTs 434 * containing only the DLT this device supports. 435 */ 436 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); 437 if (*dlt_buffer == NULL) { 438 (void)snprintf(p->errbuf, sizeof(p->errbuf), 439 "malloc: %s", pcap_strerror(errno)); 440 return (-1); 441 } 442 **dlt_buffer = p->linktype; 443 return (1); 444 } else { 445 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count); 446 if (*dlt_buffer == NULL) { 447 (void)snprintf(p->errbuf, sizeof(p->errbuf), 448 "malloc: %s", pcap_strerror(errno)); 449 return (-1); 450 } 451 (void)memcpy(*dlt_buffer, p->dlt_list, 452 sizeof(**dlt_buffer) * p->dlt_count); 453 return (p->dlt_count); 454 } 455 } 456 457 /* 458 * In Windows, you might have a library built with one version of the 459 * C runtime library and an application built with another version of 460 * the C runtime library, which means that the library might use one 461 * version of malloc() and free() and the application might use another 462 * version of malloc() and free(). If so, that means something 463 * allocated by the library cannot be freed by the application, so we 464 * need to have a pcap_free_datalinks() routine to free up the list 465 * allocated by pcap_list_datalinks(), even though it's just a wrapper 466 * around free(). 467 */ 468 void 469 pcap_free_datalinks(int *dlt_list) 470 { 471 free(dlt_list); 472 } 473 474 int 475 pcap_set_datalink(pcap_t *p, int dlt) 476 { 477 int i; 478 const char *dlt_name; 479 480 if (p->dlt_count == 0 || p->set_datalink_op == NULL) { 481 /* 482 * We couldn't fetch the list of DLTs, or we don't 483 * have a "set datalink" operation, which means 484 * this platform doesn't support changing the 485 * DLT for an interface. Check whether the new 486 * DLT is the one this interface supports. 487 */ 488 if (p->linktype != dlt) 489 goto unsupported; 490 491 /* 492 * It is, so there's nothing we need to do here. 493 */ 494 return (0); 495 } 496 for (i = 0; i < p->dlt_count; i++) 497 if (p->dlt_list[i] == dlt) 498 break; 499 if (i >= p->dlt_count) 500 goto unsupported; 501 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB && 502 dlt == DLT_DOCSIS) { 503 /* 504 * This is presumably an Ethernet device, as the first 505 * link-layer type it offers is DLT_EN10MB, and the only 506 * other type it offers is DLT_DOCSIS. That means that 507 * we can't tell the driver to supply DOCSIS link-layer 508 * headers - we're just pretending that's what we're 509 * getting, as, presumably, we're capturing on a dedicated 510 * link to a Cisco Cable Modem Termination System, and 511 * it's putting raw DOCSIS frames on the wire inside low-level 512 * Ethernet framing. 513 */ 514 p->linktype = dlt; 515 return (0); 516 } 517 if (p->set_datalink_op(p, dlt) == -1) 518 return (-1); 519 p->linktype = dlt; 520 return (0); 521 522 unsupported: 523 dlt_name = pcap_datalink_val_to_name(dlt); 524 if (dlt_name != NULL) { 525 (void) snprintf(p->errbuf, sizeof(p->errbuf), 526 "%s is not one of the DLTs supported by this device", 527 dlt_name); 528 } else { 529 (void) snprintf(p->errbuf, sizeof(p->errbuf), 530 "DLT %d is not one of the DLTs supported by this device", 531 dlt); 532 } 533 return (-1); 534 } 535 536 struct dlt_choice { 537 const char *name; 538 const char *description; 539 int dlt; 540 }; 541 542 #define DLT_CHOICE(code, description) { #code, description, code } 543 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 } 544 545 static struct dlt_choice dlt_choices[] = { 546 DLT_CHOICE(DLT_NULL, "BSD loopback"), 547 DLT_CHOICE(DLT_EN10MB, "Ethernet"), 548 DLT_CHOICE(DLT_IEEE802, "Token ring"), 549 DLT_CHOICE(DLT_ARCNET, "BSD ARCNET"), 550 DLT_CHOICE(DLT_SLIP, "SLIP"), 551 DLT_CHOICE(DLT_PPP, "PPP"), 552 DLT_CHOICE(DLT_FDDI, "FDDI"), 553 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"), 554 DLT_CHOICE(DLT_RAW, "Raw IP"), 555 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"), 556 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"), 557 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"), 558 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"), 559 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"), 560 DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"), 561 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"), 562 DLT_CHOICE(DLT_IEEE802_11, "802.11"), 563 DLT_CHOICE(DLT_FRELAY, "Frame Relay"), 564 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"), 565 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"), 566 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"), 567 DLT_CHOICE(DLT_LTALK, "Localtalk"), 568 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"), 569 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"), 570 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"), 571 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"), 572 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radiotap header"), 573 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"), 574 DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"), 575 DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"), 576 DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"), 577 DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"), 578 DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"), 579 DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"), 580 DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"), 581 DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"), 582 DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"), 583 DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"), 584 DLT_CHOICE(DLT_MTP2, "SS7 MTP2"), 585 DLT_CHOICE(DLT_MTP3, "SS7 MTP3"), 586 DLT_CHOICE(DLT_SCCP, "SS7 SCCP"), 587 DLT_CHOICE(DLT_DOCSIS, "DOCSIS"), 588 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"), 589 DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"), 590 DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"), 591 DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"), 592 DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"), 593 DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"), 594 DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"), 595 DLT_CHOICE(DLT_GPF_T, "GPF-T"), 596 DLT_CHOICE(DLT_GPF_F, "GPF-F"), 597 DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"), 598 DLT_CHOICE(DLT_ERF_ETH, "Ethernet with Endace ERF header"), 599 DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"), 600 DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"), 601 DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"), 602 DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"), 603 DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"), 604 DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"), 605 DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"), 606 DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"), 607 DLT_CHOICE(DLT_A429, "Arinc 429"), 608 DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"), 609 DLT_CHOICE(DLT_USB, "USB"), 610 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"), 611 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"), 612 DLT_CHOICE(DLT_USB_LINUX, "USB with Linux header"), 613 DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"), 614 DLT_CHOICE(DLT_IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"), 615 DLT_CHOICE(DLT_PPI, "Per-Packet Information"), 616 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"), 617 DLT_CHOICE(DLT_JUNIPER_ISM, "Juniper Integrated Service Module"), 618 DLT_CHOICE(DLT_IEEE802_15_4, "IEEE 802.15.4"), 619 DLT_CHOICE(DLT_SITA, "SITA pseudo-header"), 620 DLT_CHOICE(DLT_ERF, "Endace ERF header"), 621 DLT_CHOICE(DLT_RAIF1, "Ethernet with u10 Networks pseudo-header"), 622 DLT_CHOICE(DLT_IPMB, "IPMB"), 623 DLT_CHOICE(DLT_JUNIPER_ST, "Juniper Secure Tunnel"), 624 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"), 625 DLT_CHOICE(DLT_AX25_KISS, "AX.25 with KISS header"), 626 DLT_CHOICE(DLT_IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"), 627 DLT_CHOICE_SENTINEL 628 }; 629 630 /* 631 * This array is designed for mapping upper and lower case letter 632 * together for a case independent comparison. The mappings are 633 * based upon ascii character sequences. 634 */ 635 static const u_char charmap[] = { 636 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003', 637 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007', 638 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013', 639 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017', 640 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023', 641 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027', 642 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033', 643 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037', 644 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043', 645 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047', 646 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053', 647 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057', 648 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063', 649 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067', 650 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073', 651 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077', 652 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143', 653 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 654 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 655 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 656 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 657 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 658 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133', 659 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137', 660 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143', 661 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 662 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 663 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 664 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 665 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 666 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173', 667 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177', 668 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203', 669 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207', 670 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213', 671 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217', 672 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223', 673 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227', 674 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233', 675 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237', 676 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243', 677 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247', 678 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253', 679 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257', 680 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263', 681 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267', 682 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273', 683 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277', 684 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343', 685 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 686 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 687 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 688 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 689 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 690 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333', 691 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337', 692 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343', 693 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 694 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 695 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 696 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 697 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 698 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373', 699 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377', 700 }; 701 702 int 703 pcap_strcasecmp(const char *s1, const char *s2) 704 { 705 register const u_char *cm = charmap, 706 *us1 = (const u_char *)s1, 707 *us2 = (const u_char *)s2; 708 709 while (cm[*us1] == cm[*us2++]) 710 if (*us1++ == '\0') 711 return(0); 712 return (cm[*us1] - cm[*--us2]); 713 } 714 715 int 716 pcap_datalink_name_to_val(const char *name) 717 { 718 int i; 719 720 for (i = 0; dlt_choices[i].name != NULL; i++) { 721 if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1, 722 name) == 0) 723 return (dlt_choices[i].dlt); 724 } 725 return (-1); 726 } 727 728 const char * 729 pcap_datalink_val_to_name(int dlt) 730 { 731 int i; 732 733 for (i = 0; dlt_choices[i].name != NULL; i++) { 734 if (dlt_choices[i].dlt == dlt) 735 return (dlt_choices[i].name + sizeof("DLT_") - 1); 736 } 737 return (NULL); 738 } 739 740 const char * 741 pcap_datalink_val_to_description(int dlt) 742 { 743 int i; 744 745 for (i = 0; dlt_choices[i].name != NULL; i++) { 746 if (dlt_choices[i].dlt == dlt) 747 return (dlt_choices[i].description); 748 } 749 return (NULL); 750 } 751 752 int 753 pcap_snapshot(pcap_t *p) 754 { 755 return (p->snapshot); 756 } 757 758 int 759 pcap_is_swapped(pcap_t *p) 760 { 761 return (p->sf.swapped); 762 } 763 764 int 765 pcap_major_version(pcap_t *p) 766 { 767 return (p->sf.version_major); 768 } 769 770 int 771 pcap_minor_version(pcap_t *p) 772 { 773 return (p->sf.version_minor); 774 } 775 776 FILE * 777 pcap_file(pcap_t *p) 778 { 779 return (p->sf.rfile); 780 } 781 782 int 783 pcap_fileno(pcap_t *p) 784 { 785 #ifndef WIN32 786 return (p->fd); 787 #else 788 if (p->adapter != NULL) 789 return ((int)(DWORD)p->adapter->hFile); 790 else 791 return (-1); 792 #endif 793 } 794 795 #if !defined(WIN32) && !defined(MSDOS) 796 int 797 pcap_get_selectable_fd(pcap_t *p) 798 { 799 return (p->selectable_fd); 800 } 801 #endif 802 803 void 804 pcap_perror(pcap_t *p, char *prefix) 805 { 806 fprintf(stderr, "%s: %s\n", prefix, p->errbuf); 807 } 808 809 char * 810 pcap_geterr(pcap_t *p) 811 { 812 return (p->errbuf); 813 } 814 815 int 816 pcap_getnonblock(pcap_t *p, char *errbuf) 817 { 818 return p->getnonblock_op(p, errbuf); 819 } 820 821 /* 822 * Get the current non-blocking mode setting, under the assumption that 823 * it's just the standard POSIX non-blocking flag. 824 * 825 * We don't look at "p->nonblock", in case somebody tweaked the FD 826 * directly. 827 */ 828 #if !defined(WIN32) && !defined(MSDOS) 829 int 830 pcap_getnonblock_fd(pcap_t *p, char *errbuf) 831 { 832 int fdflags; 833 834 fdflags = fcntl(p->fd, F_GETFL, 0); 835 if (fdflags == -1) { 836 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 837 pcap_strerror(errno)); 838 return (-1); 839 } 840 if (fdflags & O_NONBLOCK) 841 return (1); 842 else 843 return (0); 844 } 845 #endif 846 847 int 848 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) 849 { 850 return p->setnonblock_op(p, nonblock, errbuf); 851 } 852 853 #if !defined(WIN32) && !defined(MSDOS) 854 /* 855 * Set non-blocking mode, under the assumption that it's just the 856 * standard POSIX non-blocking flag. (This can be called by the 857 * per-platform non-blocking-mode routine if that routine also 858 * needs to do some additional work.) 859 */ 860 int 861 pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf) 862 { 863 int fdflags; 864 865 fdflags = fcntl(p->fd, F_GETFL, 0); 866 if (fdflags == -1) { 867 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 868 pcap_strerror(errno)); 869 return (-1); 870 } 871 if (nonblock) 872 fdflags |= O_NONBLOCK; 873 else 874 fdflags &= ~O_NONBLOCK; 875 if (fcntl(p->fd, F_SETFL, fdflags) == -1) { 876 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s", 877 pcap_strerror(errno)); 878 return (-1); 879 } 880 return (0); 881 } 882 #endif 883 884 #ifdef WIN32 885 /* 886 * Generate a string for the last Win32-specific error (i.e. an error generated when 887 * calling a Win32 API). 888 * For errors occurred during standard C calls, we still use pcap_strerror() 889 */ 890 char * 891 pcap_win32strerror(void) 892 { 893 DWORD error; 894 static char errbuf[PCAP_ERRBUF_SIZE+1]; 895 int errlen; 896 char *p; 897 898 error = GetLastError(); 899 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf, 900 PCAP_ERRBUF_SIZE, NULL); 901 902 /* 903 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the 904 * message. Get rid of it. 905 */ 906 errlen = strlen(errbuf); 907 if (errlen >= 2) { 908 errbuf[errlen - 1] = '\0'; 909 errbuf[errlen - 2] = '\0'; 910 } 911 p = strchr(errbuf, '\0'); 912 snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error); 913 return (errbuf); 914 } 915 #endif 916 917 /* 918 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values. 919 */ 920 const char * 921 pcap_statustostr(int errnum) 922 { 923 static char ebuf[15+10+1]; 924 925 switch (errnum) { 926 927 case PCAP_WARNING: 928 return("Generic warning"); 929 930 case PCAP_WARNING_PROMISC_NOTSUP: 931 return ("That device doesn't support promiscuous mode"); 932 933 case PCAP_ERROR: 934 return("Generic error"); 935 936 case PCAP_ERROR_BREAK: 937 return("Loop terminated by pcap_breakloop"); 938 939 case PCAP_ERROR_NOT_ACTIVATED: 940 return("The pcap_t has not been activated"); 941 942 case PCAP_ERROR_ACTIVATED: 943 return ("The setting can't be changed after the pcap_t is activated"); 944 945 case PCAP_ERROR_NO_SUCH_DEVICE: 946 return ("No such device exists"); 947 948 case PCAP_ERROR_RFMON_NOTSUP: 949 return ("That device doesn't support monitor mode"); 950 951 case PCAP_ERROR_NOT_RFMON: 952 return ("That operation is supported only in monitor mode"); 953 954 case PCAP_ERROR_PERM_DENIED: 955 return ("You don't have permission to capture on that device"); 956 957 case PCAP_ERROR_IFACE_NOT_UP: 958 return ("That device is not up"); 959 } 960 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 961 return(ebuf); 962 } 963 964 /* 965 * Not all systems have strerror(). 966 */ 967 const char * 968 pcap_strerror(int errnum) 969 { 970 #ifdef HAVE_STRERROR 971 return (strerror(errnum)); 972 #else 973 extern int sys_nerr; 974 extern const char *const sys_errlist[]; 975 static char ebuf[15+10+1]; 976 977 if ((unsigned int)errnum < sys_nerr) 978 return ((char *)sys_errlist[errnum]); 979 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 980 return(ebuf); 981 #endif 982 } 983 984 int 985 pcap_setfilter(pcap_t *p, struct bpf_program *fp) 986 { 987 return p->setfilter_op(p, fp); 988 } 989 990 /* 991 * Set direction flag, which controls whether we accept only incoming 992 * packets, only outgoing packets, or both. 993 * Note that, depending on the platform, some or all direction arguments 994 * might not be supported. 995 */ 996 int 997 pcap_setdirection(pcap_t *p, pcap_direction_t d) 998 { 999 if (p->setdirection_op == NULL) { 1000 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1001 "Setting direction is not implemented on this platform"); 1002 return -1; 1003 } else 1004 return p->setdirection_op(p, d); 1005 } 1006 1007 int 1008 pcap_stats(pcap_t *p, struct pcap_stat *ps) 1009 { 1010 return p->stats_op(p, ps); 1011 } 1012 1013 static int 1014 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_) 1015 { 1016 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1017 "Statistics aren't available from a pcap_open_dead pcap_t"); 1018 return (-1); 1019 } 1020 1021 #ifdef WIN32 1022 int 1023 pcap_setbuff(pcap_t *p, int dim) 1024 { 1025 return p->setbuff_op(p, dim); 1026 } 1027 1028 static int 1029 pcap_setbuff_dead(pcap_t *p, int dim) 1030 { 1031 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1032 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t"); 1033 return (-1); 1034 } 1035 1036 int 1037 pcap_setmode(pcap_t *p, int mode) 1038 { 1039 return p->setmode_op(p, mode); 1040 } 1041 1042 static int 1043 pcap_setmode_dead(pcap_t *p, int mode) 1044 { 1045 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1046 "impossible to set mode on a pcap_open_dead pcap_t"); 1047 return (-1); 1048 } 1049 1050 int 1051 pcap_setmintocopy(pcap_t *p, int size) 1052 { 1053 return p->setmintocopy_op(p, size); 1054 } 1055 1056 static int 1057 pcap_setmintocopy_dead(pcap_t *p, int size) 1058 { 1059 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1060 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t"); 1061 return (-1); 1062 } 1063 #endif 1064 1065 /* 1066 * On some platforms, we need to clean up promiscuous or monitor mode 1067 * when we close a device - and we want that to happen even if the 1068 * application just exits without explicitl closing devices. 1069 * On those platforms, we need to register a "close all the pcaps" 1070 * routine to be called when we exit, and need to maintain a list of 1071 * pcaps that need to be closed to clean up modes. 1072 * 1073 * XXX - not thread-safe. 1074 */ 1075 1076 /* 1077 * List of pcaps on which we've done something that needs to be 1078 * cleaned up. 1079 * If there are any such pcaps, we arrange to call "pcap_close_all()" 1080 * when we exit, and have it close all of them. 1081 */ 1082 static struct pcap *pcaps_to_close; 1083 1084 /* 1085 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to 1086 * be called on exit. 1087 */ 1088 static int did_atexit; 1089 1090 static void 1091 pcap_close_all(void) 1092 { 1093 struct pcap *handle; 1094 1095 while ((handle = pcaps_to_close) != NULL) 1096 pcap_close(handle); 1097 } 1098 1099 int 1100 pcap_do_addexit(pcap_t *p) 1101 { 1102 /* 1103 * If we haven't already done so, arrange to have 1104 * "pcap_close_all()" called when we exit. 1105 */ 1106 if (!did_atexit) { 1107 if (atexit(pcap_close_all) == -1) { 1108 /* 1109 * "atexit()" failed; let our caller know. 1110 */ 1111 strncpy(p->errbuf, "atexit failed", 1112 PCAP_ERRBUF_SIZE); 1113 return (0); 1114 } 1115 did_atexit = 1; 1116 } 1117 return (1); 1118 } 1119 1120 void 1121 pcap_add_to_pcaps_to_close(pcap_t *p) 1122 { 1123 p->md.next = pcaps_to_close; 1124 pcaps_to_close = p; 1125 } 1126 1127 void 1128 pcap_remove_from_pcaps_to_close(pcap_t *p) 1129 { 1130 pcap_t *pc, *prevpc; 1131 1132 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL; 1133 prevpc = pc, pc = pc->md.next) { 1134 if (pc == p) { 1135 /* 1136 * Found it. Remove it from the list. 1137 */ 1138 if (prevpc == NULL) { 1139 /* 1140 * It was at the head of the list. 1141 */ 1142 pcaps_to_close = pc->md.next; 1143 } else { 1144 /* 1145 * It was in the middle of the list. 1146 */ 1147 prevpc->md.next = pc->md.next; 1148 } 1149 break; 1150 } 1151 } 1152 } 1153 1154 void 1155 pcap_cleanup_live_common(pcap_t *p) 1156 { 1157 if (p->buffer != NULL) { 1158 free(p->buffer); 1159 p->buffer = NULL; 1160 } 1161 if (p->dlt_list != NULL) { 1162 free(p->dlt_list); 1163 p->dlt_list = NULL; 1164 p->dlt_count = 0; 1165 } 1166 pcap_freecode(&p->fcode); 1167 #if !defined(WIN32) && !defined(MSDOS) 1168 if (p->fd >= 0) { 1169 close(p->fd); 1170 p->fd = -1; 1171 } 1172 #endif 1173 } 1174 1175 static void 1176 pcap_cleanup_dead(pcap_t *p _U_) 1177 { 1178 /* Nothing to do. */ 1179 } 1180 1181 pcap_t * 1182 pcap_open_dead(int linktype, int snaplen) 1183 { 1184 pcap_t *p; 1185 1186 p = malloc(sizeof(*p)); 1187 if (p == NULL) 1188 return NULL; 1189 memset (p, 0, sizeof(*p)); 1190 p->snapshot = snaplen; 1191 p->linktype = linktype; 1192 p->stats_op = pcap_stats_dead; 1193 #ifdef WIN32 1194 p->setbuff_op = pcap_setbuff_dead; 1195 p->setmode_op = pcap_setmode_dead; 1196 p->setmintocopy_op = pcap_setmintocopy_dead; 1197 #endif 1198 p->cleanup_op = pcap_cleanup_dead; 1199 p->activated = 1; 1200 return p; 1201 } 1202 1203 /* 1204 * API compatible with WinPcap's "send a packet" routine - returns -1 1205 * on error, 0 otherwise. 1206 * 1207 * XXX - what if we get a short write? 1208 */ 1209 int 1210 pcap_sendpacket(pcap_t *p, const u_char *buf, int size) 1211 { 1212 if (p->inject_op(p, buf, size) == -1) 1213 return (-1); 1214 return (0); 1215 } 1216 1217 /* 1218 * API compatible with OpenBSD's "send a packet" routine - returns -1 on 1219 * error, number of bytes written otherwise. 1220 */ 1221 int 1222 pcap_inject(pcap_t *p, const void *buf, size_t size) 1223 { 1224 return (p->inject_op(p, buf, size)); 1225 } 1226 1227 void 1228 pcap_close(pcap_t *p) 1229 { 1230 if (p->opt.source != NULL) 1231 free(p->opt.source); 1232 p->cleanup_op(p); 1233 free(p); 1234 } 1235 1236 /* 1237 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw 1238 * data for the packet, check whether the packet passes the filter. 1239 * Returns the return value of the filter program, which will be zero if 1240 * the packet doesn't pass and non-zero if the packet does pass. 1241 */ 1242 int 1243 pcap_offline_filter(struct bpf_program *fp, const struct pcap_pkthdr *h, 1244 const u_char *pkt) 1245 { 1246 struct bpf_insn *fcode = fp->bf_insns; 1247 1248 if (fcode != NULL) 1249 return (bpf_filter(fcode, pkt, h->len, h->caplen)); 1250 else 1251 return (0); 1252 } 1253 1254 /* 1255 * We make the version string static, and return a pointer to it, rather 1256 * than exporting the version string directly. On at least some UNIXes, 1257 * if you import data from a shared library into an program, the data is 1258 * bound into the program binary, so if the string in the version of the 1259 * library with which the program was linked isn't the same as the 1260 * string in the version of the library with which the program is being 1261 * run, various undesirable things may happen (warnings, the string 1262 * being the one from the version of the library with which the program 1263 * was linked, or even weirder things, such as the string being the one 1264 * from the library but being truncated). 1265 */ 1266 #ifdef HAVE_VERSION_H 1267 #include "version.h" 1268 #else 1269 static const char pcap_version_string[] = "libpcap version 0.9[.x]"; 1270 #endif 1271 1272 #ifdef WIN32 1273 /* 1274 * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap 1275 * version numbers when building WinPcap. (It'd be nice to do so for 1276 * the packet.dll version number as well.) 1277 */ 1278 static const char wpcap_version_string[] = "4.0"; 1279 static const char pcap_version_string_fmt[] = 1280 "WinPcap version %s, based on %s"; 1281 static const char pcap_version_string_packet_dll_fmt[] = 1282 "WinPcap version %s (packet.dll version %s), based on %s"; 1283 static char *full_pcap_version_string; 1284 1285 const char * 1286 pcap_lib_version(void) 1287 { 1288 char *packet_version_string; 1289 size_t full_pcap_version_string_len; 1290 1291 if (full_pcap_version_string == NULL) { 1292 /* 1293 * Generate the version string. 1294 */ 1295 packet_version_string = PacketGetVersion(); 1296 if (strcmp(wpcap_version_string, packet_version_string) == 0) { 1297 /* 1298 * WinPcap version string and packet.dll version 1299 * string are the same; just report the WinPcap 1300 * version. 1301 */ 1302 full_pcap_version_string_len = 1303 (sizeof pcap_version_string_fmt - 4) + 1304 strlen(wpcap_version_string) + 1305 strlen(pcap_version_string); 1306 full_pcap_version_string = 1307 malloc(full_pcap_version_string_len); 1308 sprintf(full_pcap_version_string, 1309 pcap_version_string_fmt, wpcap_version_string, 1310 pcap_version_string); 1311 } else { 1312 /* 1313 * WinPcap version string and packet.dll version 1314 * string are different; that shouldn't be the 1315 * case (the two libraries should come from the 1316 * same version of WinPcap), so we report both 1317 * versions. 1318 */ 1319 full_pcap_version_string_len = 1320 (sizeof pcap_version_string_packet_dll_fmt - 6) + 1321 strlen(wpcap_version_string) + 1322 strlen(packet_version_string) + 1323 strlen(pcap_version_string); 1324 full_pcap_version_string = malloc(full_pcap_version_string_len); 1325 1326 sprintf(full_pcap_version_string, 1327 pcap_version_string_packet_dll_fmt, 1328 wpcap_version_string, packet_version_string, 1329 pcap_version_string); 1330 } 1331 } 1332 return (full_pcap_version_string); 1333 } 1334 1335 #elif defined(MSDOS) 1336 1337 static char *full_pcap_version_string; 1338 1339 const char * 1340 pcap_lib_version (void) 1341 { 1342 char *packet_version_string; 1343 size_t full_pcap_version_string_len; 1344 static char dospfx[] = "DOS-"; 1345 1346 if (full_pcap_version_string == NULL) { 1347 /* 1348 * Generate the version string. 1349 */ 1350 full_pcap_version_string_len = 1351 sizeof dospfx + strlen(pcap_version_string); 1352 full_pcap_version_string = 1353 malloc(full_pcap_version_string_len); 1354 strcpy(full_pcap_version_string, dospfx); 1355 strcat(full_pcap_version_string, pcap_version_string); 1356 } 1357 return (full_pcap_version_string); 1358 } 1359 1360 #else /* UN*X */ 1361 1362 const char * 1363 pcap_lib_version(void) 1364 { 1365 return (pcap_version_string); 1366 } 1367 #endif 1368