1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ 2 /* 3 * Copyright (c) 1994, 1995, 1996, 1997, 1998 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the Computer Systems 17 * Engineering Group at Lawrence Berkeley Laboratory. 18 * 4. Neither the name of the University nor of the Laboratory may be used 19 * to endorse or promote products derived from this software without 20 * specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 static const char rcsid[] _U_ = 37 "@(#) $Header: /tcpdump/master/libpcap/inet.c,v 1.66.2.6 2007/06/11 09:52:04 guy Exp $ (LBL)"; 38 #endif 39 40 #ifdef HAVE_CONFIG_H 41 #include "config.h" 42 #endif 43 44 #ifdef WIN32 45 #include <pcap-stdinc.h> 46 #else /* WIN32 */ 47 48 #include <sys/param.h> 49 #ifndef MSDOS 50 #include <sys/file.h> 51 #endif 52 #include <sys/ioctl.h> 53 #include <sys/socket.h> 54 #ifdef HAVE_SYS_SOCKIO_H 55 #include <sys/sockio.h> 56 #endif 57 58 struct mbuf; /* Squelch compiler warnings on some platforms for */ 59 struct rtentry; /* declarations in <net/if.h> */ 60 #include <net/if.h> 61 #include <netinet/in.h> 62 #endif /* WIN32 */ 63 64 #include <ctype.h> 65 #include <errno.h> 66 #include <memory.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #if !defined(WIN32) && !defined(__BORLANDC__) 71 #include <unistd.h> 72 #endif /* !WIN32 && !__BORLANDC__ */ 73 #ifdef HAVE_LIMITS_H 74 #include <limits.h> 75 #else 76 #define INT_MAX 2147483647 77 #endif 78 79 #include "pcap-int.h" 80 81 #ifdef HAVE_OS_PROTO_H 82 #include "os-proto.h" 83 #endif 84 85 /* Not all systems have IFF_LOOPBACK */ 86 #ifdef IFF_LOOPBACK 87 #define ISLOOPBACK(name, flags) ((flags) & IFF_LOOPBACK) 88 #else 89 #define ISLOOPBACK(name, flags) ((name)[0] == 'l' && (name)[1] == 'o' && \ 90 (isdigit((unsigned char)((name)[2])) || (name)[2] == '\0')) 91 #endif 92 93 struct sockaddr * 94 dup_sockaddr(struct sockaddr *sa, size_t sa_length) 95 { 96 struct sockaddr *newsa; 97 98 if ((newsa = malloc(sa_length)) == NULL) 99 return (NULL); 100 return (memcpy(newsa, sa, sa_length)); 101 } 102 103 static int 104 get_instance(const char *name) 105 { 106 const char *cp, *endcp; 107 int n; 108 109 if (strcmp(name, "any") == 0) { 110 /* 111 * Give the "any" device an artificially high instance 112 * number, so it shows up after all other non-loopback 113 * interfaces. 114 */ 115 return INT_MAX; 116 } 117 118 endcp = name + strlen(name); 119 for (cp = name; cp < endcp && !isdigit((unsigned char)*cp); ++cp) 120 continue; 121 122 if (isdigit((unsigned char)*cp)) 123 n = atoi(cp); 124 else 125 n = 0; 126 return (n); 127 } 128 129 int 130 add_or_find_if(pcap_if_t **curdev_ret, pcap_if_t **alldevs, const char *name, 131 u_int flags, const char *description, char *errbuf) 132 { 133 pcap_t *p; 134 pcap_if_t *curdev, *prevdev, *nextdev; 135 int this_instance; 136 137 /* 138 * Is there already an entry in the list for this interface? 139 */ 140 for (curdev = *alldevs; curdev != NULL; curdev = curdev->next) { 141 if (strcmp(name, curdev->name) == 0) 142 break; /* yes, we found it */ 143 } 144 145 if (curdev == NULL) { 146 /* 147 * No, we didn't find it. 148 * 149 * Can we open this interface for live capture? 150 * 151 * We do this check so that interfaces that are 152 * supplied by the interface enumeration mechanism 153 * we're using but that don't support packet capture 154 * aren't included in the list. Loopback interfaces 155 * on Solaris are an example of this; we don't just 156 * omit loopback interfaces on all platforms because 157 * you *can* capture on loopback interfaces on some 158 * OSes. 159 * 160 * On OS X, we don't do this check if the device 161 * name begins with "wlt"; at least some versions 162 * of OS X offer monitor mode capturing by having 163 * a separate "monitor mode" device for each wireless 164 * adapter, rather than by implementing the ioctls 165 * that {Free,Net,Open,DragonFly}BSD provide. 166 * Opening that device puts the adapter into monitor 167 * mode, which, at least for some adapters, causes 168 * them to deassociate from the network with which 169 * they're associated. 170 * 171 * Instead, we try to open the corresponding "en" 172 * device (so that we don't end up with, for users 173 * without sufficient privilege to open capture 174 * devices, a list of adapters that only includes 175 * the wlt devices). 176 */ 177 #ifdef __APPLE__ 178 if (strncmp(name, "wlt", 3) == 0) { 179 char *en_name; 180 size_t en_name_len; 181 182 /* 183 * Try to allocate a buffer for the "en" 184 * device's name. 185 */ 186 en_name_len = strlen(name) - 1; 187 en_name = malloc(en_name_len + 1); 188 if (en_name == NULL) { 189 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 190 "malloc: %s", pcap_strerror(errno)); 191 return (-1); 192 } 193 strcpy(en_name, "en"); 194 strcat(en_name, name + 3); 195 p = pcap_open_live(en_name, 68, 0, 0, errbuf); 196 free(en_name); 197 } else 198 #endif /* __APPLE */ 199 p = pcap_open_live(name, 68, 0, 0, errbuf); 200 if (p == NULL) { 201 /* 202 * No. Don't bother including it. 203 * Don't treat this as an error, though. 204 */ 205 *curdev_ret = NULL; 206 return (0); 207 } 208 pcap_close(p); 209 210 /* 211 * Yes, we can open it. 212 * Allocate a new entry. 213 */ 214 curdev = malloc(sizeof(pcap_if_t)); 215 if (curdev == NULL) { 216 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 217 "malloc: %s", pcap_strerror(errno)); 218 return (-1); 219 } 220 221 /* 222 * Fill in the entry. 223 */ 224 curdev->next = NULL; 225 curdev->name = strdup(name); 226 if (curdev->name == NULL) { 227 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 228 "malloc: %s", pcap_strerror(errno)); 229 free(curdev); 230 return (-1); 231 } 232 if (description != NULL) { 233 /* 234 * We have a description for this interface. 235 */ 236 curdev->description = strdup(description); 237 if (curdev->description == NULL) { 238 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 239 "malloc: %s", pcap_strerror(errno)); 240 free(curdev->name); 241 free(curdev); 242 return (-1); 243 } 244 } else { 245 /* 246 * We don't. 247 */ 248 curdev->description = NULL; 249 } 250 curdev->addresses = NULL; /* list starts out as empty */ 251 curdev->flags = 0; 252 if (ISLOOPBACK(name, flags)) 253 curdev->flags |= PCAP_IF_LOOPBACK; 254 255 /* 256 * Add it to the list, in the appropriate location. 257 * First, get the instance number of this interface. 258 */ 259 this_instance = get_instance(name); 260 261 /* 262 * Now look for the last interface with an instance number 263 * less than or equal to the new interface's instance 264 * number - except that non-loopback interfaces are 265 * arbitrarily treated as having interface numbers less 266 * than those of loopback interfaces, so the loopback 267 * interfaces are put at the end of the list. 268 * 269 * We start with "prevdev" being NULL, meaning we're before 270 * the first element in the list. 271 */ 272 prevdev = NULL; 273 for (;;) { 274 /* 275 * Get the interface after this one. 276 */ 277 if (prevdev == NULL) { 278 /* 279 * The next element is the first element. 280 */ 281 nextdev = *alldevs; 282 } else 283 nextdev = prevdev->next; 284 285 /* 286 * Are we at the end of the list? 287 */ 288 if (nextdev == NULL) { 289 /* 290 * Yes - we have to put the new entry 291 * after "prevdev". 292 */ 293 break; 294 } 295 296 /* 297 * Is the new interface a non-loopback interface 298 * and the next interface a loopback interface? 299 */ 300 if (!(curdev->flags & PCAP_IF_LOOPBACK) && 301 (nextdev->flags & PCAP_IF_LOOPBACK)) { 302 /* 303 * Yes, we should put the new entry 304 * before "nextdev", i.e. after "prevdev". 305 */ 306 break; 307 } 308 309 /* 310 * Is the new interface's instance number less 311 * than the next interface's instance number, 312 * and is it the case that the new interface is a 313 * non-loopback interface or the next interface is 314 * a loopback interface? 315 * 316 * (The goal of both loopback tests is to make 317 * sure that we never put a loopback interface 318 * before any non-loopback interface and that we 319 * always put a non-loopback interface before all 320 * loopback interfaces.) 321 */ 322 if (this_instance < get_instance(nextdev->name) && 323 (!(curdev->flags & PCAP_IF_LOOPBACK) || 324 (nextdev->flags & PCAP_IF_LOOPBACK))) { 325 /* 326 * Yes - we should put the new entry 327 * before "nextdev", i.e. after "prevdev". 328 */ 329 break; 330 } 331 332 prevdev = nextdev; 333 } 334 335 /* 336 * Insert before "nextdev". 337 */ 338 curdev->next = nextdev; 339 340 /* 341 * Insert after "prevdev" - unless "prevdev" is null, 342 * in which case this is the first interface. 343 */ 344 if (prevdev == NULL) { 345 /* 346 * This is the first interface. Pass back a 347 * pointer to it, and put "curdev" before 348 * "nextdev". 349 */ 350 *alldevs = curdev; 351 } else 352 prevdev->next = curdev; 353 } 354 355 *curdev_ret = curdev; 356 return (0); 357 } 358 359 int 360 add_addr_to_iflist(pcap_if_t **alldevs, const char *name, u_int flags, 361 struct sockaddr *addr, size_t addr_size, 362 struct sockaddr *netmask, size_t netmask_size, 363 struct sockaddr *broadaddr, size_t broadaddr_size, 364 struct sockaddr *dstaddr, size_t dstaddr_size, 365 char *errbuf) 366 { 367 pcap_if_t *curdev; 368 pcap_addr_t *curaddr, *prevaddr, *nextaddr; 369 370 if (add_or_find_if(&curdev, alldevs, name, flags, NULL, errbuf) == -1) { 371 /* 372 * Error - give up. 373 */ 374 return (-1); 375 } 376 if (curdev == NULL) { 377 /* 378 * Device wasn't added because it can't be opened. 379 * Not a fatal error. 380 */ 381 return (0); 382 } 383 384 /* 385 * "curdev" is an entry for this interface; add an entry for this 386 * address to its list of addresses. 387 * 388 * Allocate the new entry and fill it in. 389 */ 390 curaddr = malloc(sizeof(pcap_addr_t)); 391 if (curaddr == NULL) { 392 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 393 "malloc: %s", pcap_strerror(errno)); 394 return (-1); 395 } 396 397 curaddr->next = NULL; 398 if (addr != NULL) { 399 curaddr->addr = dup_sockaddr(addr, addr_size); 400 if (curaddr->addr == NULL) { 401 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 402 "malloc: %s", pcap_strerror(errno)); 403 free(curaddr); 404 return (-1); 405 } 406 } else 407 curaddr->addr = NULL; 408 409 if (netmask != NULL) { 410 curaddr->netmask = dup_sockaddr(netmask, netmask_size); 411 if (curaddr->netmask == NULL) { 412 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 413 "malloc: %s", pcap_strerror(errno)); 414 if (curaddr->addr != NULL) 415 free(curaddr->addr); 416 free(curaddr); 417 return (-1); 418 } 419 } else 420 curaddr->netmask = NULL; 421 422 if (broadaddr != NULL) { 423 curaddr->broadaddr = dup_sockaddr(broadaddr, broadaddr_size); 424 if (curaddr->broadaddr == NULL) { 425 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 426 "malloc: %s", pcap_strerror(errno)); 427 if (curaddr->netmask != NULL) 428 free(curaddr->netmask); 429 if (curaddr->addr != NULL) 430 free(curaddr->addr); 431 free(curaddr); 432 return (-1); 433 } 434 } else 435 curaddr->broadaddr = NULL; 436 437 if (dstaddr != NULL) { 438 curaddr->dstaddr = dup_sockaddr(dstaddr, dstaddr_size); 439 if (curaddr->dstaddr == NULL) { 440 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 441 "malloc: %s", pcap_strerror(errno)); 442 if (curaddr->broadaddr != NULL) 443 free(curaddr->broadaddr); 444 if (curaddr->netmask != NULL) 445 free(curaddr->netmask); 446 if (curaddr->addr != NULL) 447 free(curaddr->addr); 448 free(curaddr); 449 return (-1); 450 } 451 } else 452 curaddr->dstaddr = NULL; 453 454 /* 455 * Find the end of the list of addresses. 456 */ 457 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) { 458 nextaddr = prevaddr->next; 459 if (nextaddr == NULL) { 460 /* 461 * This is the end of the list. 462 */ 463 break; 464 } 465 } 466 467 if (prevaddr == NULL) { 468 /* 469 * The list was empty; this is the first member. 470 */ 471 curdev->addresses = curaddr; 472 } else { 473 /* 474 * "prevaddr" is the last member of the list; append 475 * this member to it. 476 */ 477 prevaddr->next = curaddr; 478 } 479 480 return (0); 481 } 482 483 int 484 pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags, 485 const char *description, char *errbuf) 486 { 487 pcap_if_t *curdev; 488 489 return (add_or_find_if(&curdev, devlist, name, flags, description, 490 errbuf)); 491 } 492 493 494 /* 495 * Free a list of interfaces. 496 */ 497 void 498 pcap_freealldevs(pcap_if_t *alldevs) 499 { 500 pcap_if_t *curdev, *nextdev; 501 pcap_addr_t *curaddr, *nextaddr; 502 503 for (curdev = alldevs; curdev != NULL; curdev = nextdev) { 504 nextdev = curdev->next; 505 506 /* 507 * Free all addresses. 508 */ 509 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) { 510 nextaddr = curaddr->next; 511 if (curaddr->addr) 512 free(curaddr->addr); 513 if (curaddr->netmask) 514 free(curaddr->netmask); 515 if (curaddr->broadaddr) 516 free(curaddr->broadaddr); 517 if (curaddr->dstaddr) 518 free(curaddr->dstaddr); 519 free(curaddr); 520 } 521 522 /* 523 * Free the name string. 524 */ 525 free(curdev->name); 526 527 /* 528 * Free the description string, if any. 529 */ 530 if (curdev->description != NULL) 531 free(curdev->description); 532 533 /* 534 * Free the interface. 535 */ 536 free(curdev); 537 } 538 } 539 540 #if !defined(WIN32) && !defined(MSDOS) 541 542 /* 543 * Return the name of a network interface attached to the system, or NULL 544 * if none can be found. The interface must be configured up; the 545 * lowest unit number is preferred; loopback is ignored. 546 */ 547 char * 548 pcap_lookupdev(errbuf) 549 register char *errbuf; 550 { 551 pcap_if_t *alldevs; 552 /* for old BSD systems, including bsdi3 */ 553 #ifndef IF_NAMESIZE 554 #define IF_NAMESIZE IFNAMSIZ 555 #endif 556 static char device[IF_NAMESIZE + 1]; 557 char *ret; 558 559 if (pcap_findalldevs(&alldevs, errbuf) == -1) 560 return (NULL); 561 562 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) { 563 /* 564 * There are no devices on the list, or the first device 565 * on the list is a loopback device, which means there 566 * are no non-loopback devices on the list. This means 567 * we can't return any device. 568 * 569 * XXX - why not return a loopback device? If we can't 570 * capture on it, it won't be on the list, and if it's 571 * on the list, there aren't any non-loopback devices, 572 * so why not just supply it as the default device? 573 */ 574 (void)strlcpy(errbuf, "no suitable device found", 575 PCAP_ERRBUF_SIZE); 576 ret = NULL; 577 } else { 578 /* 579 * Return the name of the first device on the list. 580 */ 581 (void)strlcpy(device, alldevs->name, sizeof(device)); 582 ret = device; 583 } 584 585 pcap_freealldevs(alldevs); 586 return (ret); 587 } 588 589 int 590 pcap_lookupnet(device, netp, maskp, errbuf) 591 register const char *device; 592 register bpf_u_int32 *netp, *maskp; 593 register char *errbuf; 594 { 595 register int fd; 596 register struct sockaddr_in *sin4; 597 struct ifreq ifr; 598 599 /* 600 * The pseudo-device "any" listens on all interfaces and therefore 601 * has the network address and -mask "0.0.0.0" therefore catching 602 * all traffic. Using NULL for the interface is the same as "any". 603 */ 604 if (!device || strcmp(device, "any") == 0 605 #ifdef HAVE_DAG_API 606 || strstr(device, "dag") != NULL 607 #endif 608 #ifdef HAVE_SEPTEL_API 609 || strstr(device, "septel") != NULL 610 #endif 611 ) { 612 *netp = *maskp = 0; 613 return 0; 614 } 615 616 fd = socket(AF_INET, SOCK_DGRAM, 0); 617 if (fd < 0) { 618 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s", 619 pcap_strerror(errno)); 620 return (-1); 621 } 622 memset(&ifr, 0, sizeof(ifr)); 623 #ifdef linux 624 /* XXX Work around Linux kernel bug */ 625 ifr.ifr_addr.sa_family = AF_INET; 626 #endif 627 (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 628 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { 629 if (errno == EADDRNOTAVAIL) { 630 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 631 "%s: no IPv4 address assigned", device); 632 } else { 633 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 634 "SIOCGIFADDR: %s: %s", 635 device, pcap_strerror(errno)); 636 } 637 (void)close(fd); 638 return (-1); 639 } 640 sin4 = (struct sockaddr_in *)&ifr.ifr_addr; 641 *netp = sin4->sin_addr.s_addr; 642 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) { 643 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 644 "SIOCGIFNETMASK: %s: %s", device, pcap_strerror(errno)); 645 (void)close(fd); 646 return (-1); 647 } 648 (void)close(fd); 649 *maskp = sin4->sin_addr.s_addr; 650 if (*maskp == 0) { 651 if (IN_CLASSA(*netp)) 652 *maskp = IN_CLASSA_NET; 653 else if (IN_CLASSB(*netp)) 654 *maskp = IN_CLASSB_NET; 655 else if (IN_CLASSC(*netp)) 656 *maskp = IN_CLASSC_NET; 657 else { 658 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 659 "inet class for 0x%x unknown", *netp); 660 return (-1); 661 } 662 } 663 *netp &= *maskp; 664 return (0); 665 } 666 667 #elif defined(WIN32) 668 669 /* 670 * Return the name of a network interface attached to the system, or NULL 671 * if none can be found. The interface must be configured up; the 672 * lowest unit number is preferred; loopback is ignored. 673 */ 674 char * 675 pcap_lookupdev(errbuf) 676 register char *errbuf; 677 { 678 DWORD dwVersion; 679 DWORD dwWindowsMajorVersion; 680 dwVersion = GetVersion(); /* get the OS version */ 681 dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion))); 682 683 if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) { 684 /* 685 * Windows 95, 98, ME. 686 */ 687 ULONG NameLength = 8192; 688 static char AdaptersName[8192]; 689 690 if (PacketGetAdapterNames(AdaptersName,&NameLength) ) 691 return (AdaptersName); 692 else 693 return NULL; 694 } else { 695 /* 696 * Windows NT (NT 4.0, W2K, WXP). Convert the names to UNICODE for backward compatibility 697 */ 698 ULONG NameLength = 8192; 699 static WCHAR AdaptersName[8192]; 700 char *tAstr; 701 WCHAR *tUstr; 702 WCHAR *TAdaptersName = (WCHAR*)malloc(8192 * sizeof(WCHAR)); 703 int NAdapts = 0; 704 705 if(TAdaptersName == NULL) 706 { 707 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure"); 708 return NULL; 709 } 710 711 if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) ) 712 { 713 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 714 "PacketGetAdapterNames: %s", 715 pcap_win32strerror()); 716 free(TAdaptersName); 717 return NULL; 718 } 719 720 721 tAstr = (char*)TAdaptersName; 722 tUstr = (WCHAR*)AdaptersName; 723 724 /* 725 * Convert and copy the device names 726 */ 727 while(sscanf(tAstr, "%S", tUstr) > 0) 728 { 729 tAstr += strlen(tAstr) + 1; 730 tUstr += wcslen(tUstr) + 1; 731 NAdapts ++; 732 } 733 734 tAstr++; 735 *tUstr = 0; 736 tUstr++; 737 738 /* 739 * Copy the descriptions 740 */ 741 while(NAdapts--) 742 { 743 strcpy((char*)tUstr, tAstr); 744 (char*)tUstr += strlen(tAstr) + 1;; 745 tAstr += strlen(tAstr) + 1; 746 } 747 748 free(TAdaptersName); 749 return (char *)(AdaptersName); 750 } 751 } 752 753 754 int 755 pcap_lookupnet(device, netp, maskp, errbuf) 756 register const char *device; 757 register bpf_u_int32 *netp, *maskp; 758 register char *errbuf; 759 { 760 /* 761 * We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo() 762 * in order to skip non IPv4 (i.e. IPv6 addresses) 763 */ 764 npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES]; 765 LONG if_addr_size = 1; 766 struct sockaddr_in *t_addr; 767 unsigned int i; 768 769 if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) { 770 *netp = *maskp = 0; 771 return (0); 772 } 773 774 for(i=0; i<MAX_NETWORK_ADDRESSES; i++) 775 { 776 if(if_addrs[i].IPAddress.ss_family == AF_INET) 777 { 778 t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress); 779 *netp = t_addr->sin_addr.S_un.S_addr; 780 t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask); 781 *maskp = t_addr->sin_addr.S_un.S_addr; 782 783 *netp &= *maskp; 784 return (0); 785 } 786 787 } 788 789 *netp = *maskp = 0; 790 return (0); 791 } 792 793 #endif /* !WIN32 && !MSDOS */ 794
