The Tcpdump Group git mirrors - libpcap/blob - inet.c

   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 2005-02-10 19:38:06 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          * Can we open this interface for live capture?
 139          *
 140          * We do this check so that interfaces that ae supplied
 141          * by the interface enumeration mechanism we're using
 142          * but that don't support packet capture aren't included
 143          * in the list.  An example of this is loopback interfaces
 144          * on Solaris; we don't just omit loopback interfaces
 145          * becaue you *can* capture on loopback interfaces on some
 146          * OSes.
 147          */
 148         p = pcap_open_live(name, 68, 0, 0, errbuf);
 149         if (p == NULL) {
 150                 /*
 151                  * No.  Don't bother including it.
 152                  * Don't treat this as an error, though.
 153                  */
 154                 *curdev_ret = NULL;
 155                 return (0);
 156         }
 157         pcap_close(p);
 158
 159         /*
 160          * Is there already an entry in the list for this interface?
 161          */
 162         for (curdev = *alldevs; curdev != NULL; curdev = curdev->next) {
 163                 if (strcmp(name, curdev->name) == 0)
 164                         break;  /* yes, we found it */
 165         }
 166         if (curdev == NULL) {
 167                 /*
 168                  * No, we didn't find it.
 169                  * Allocate a new entry.
 170                  */
 171                 curdev = malloc(sizeof(pcap_if_t));
 172                 if (curdev == NULL) {
 173                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 174                             "malloc: %s", pcap_strerror(errno));
 175                         return (-1);
 176                 }
 177
 178                 /*
 179                  * Fill in the entry.
 180                  */
 181                 curdev->next = NULL;
 182                 curdev->name = malloc(strlen(name) + 1);
 183                 strcpy(curdev->name, name);
 184                 if (description != NULL) {
 185                         /*
 186                          * We have a description for this interface.
 187                          */
 188                         curdev->description = malloc(strlen(description) + 1);
 189                         strcpy(curdev->description, description);
 190                 } else {
 191                         /*
 192                          * We don't.
 193                          */
 194                         curdev->description = NULL;
 195                 }
 196                 curdev->addresses = NULL;       /* list starts out as empty */
 197                 curdev->flags = 0;
 198                 if (ISLOOPBACK(name, flags))
 199                         curdev->flags |= PCAP_IF_LOOPBACK;
 200
 201                 /*
 202                  * Add it to the list, in the appropriate location.
 203                  * First, get the instance number of this interface.
 204                  */
 205                 this_instance = get_instance(name);
 206
 207                 /*
 208                  * Now look for the last interface with an instance number
 209                  * less than or equal to the new interface's instance
 210                  * number - except that non-loopback interfaces are
 211                  * arbitrarily treated as having interface numbers less
 212                  * than those of loopback interfaces, so the loopback
 213                  * interfaces are put at the end of the list.
 214                  *
 215                  * We start with "prevdev" being NULL, meaning we're before
 216                  * the first element in the list.
 217                  */
 218                 prevdev = NULL;
 219                 for (;;) {
 220                         /*
 221                          * Get the interface after this one.
 222                          */
 223                         if (prevdev == NULL) {
 224                                 /*
 225                                  * The next element is the first element.
 226                                  */
 227                                 nextdev = *alldevs;
 228                         } else
 229                                 nextdev = prevdev->next;
 230
 231                         /*
 232                          * Are we at the end of the list?
 233                          */
 234                         if (nextdev == NULL) {
 235                                 /*
 236                                  * Yes - we have to put the new entry
 237                                  * after "prevdev".
 238                                  */
 239                                 break;
 240                         }
 241
 242                         /*
 243                          * Is the new interface a non-loopback interface
 244                          * and the next interface a loopback interface?
 245                          */
 246                         if (!(curdev->flags & PCAP_IF_LOOPBACK) &&
 247                             (nextdev->flags & PCAP_IF_LOOPBACK)) {
 248                                 /*
 249                                  * Yes, we should put the new entry
 250                                  * before "nextdev", i.e. after "prevdev".
 251                                  */
 252                                 break;
 253                         }
 254
 255                         /*
 256                          * Is the new interface's instance number less
 257                          * than the next interface's instance number,
 258                          * and is it the case that the new interface is a
 259                          * non-loopback interface or the next interface is
 260                          * a loopback interface?
 261                          *
 262                          * (The goal of both loopback tests is to make
 263                          * sure that we never put a loopback interface
 264                          * before any non-loopback interface and that we
 265                          * always put a non-loopback interface before all
 266                          * loopback interfaces.)
 267                          */
 268                         if (this_instance < get_instance(nextdev->name) &&
 269                             (!(curdev->flags & PCAP_IF_LOOPBACK) ||
 270                                (nextdev->flags & PCAP_IF_LOOPBACK))) {
 271                                 /*
 272                                  * Yes - we should put the new entry
 273                                  * before "nextdev", i.e. after "prevdev".
 274                                  */
 275                                 break;
 276                         }
 277
 278                         prevdev = nextdev;
 279                 }
 280
 281                 /*
 282                  * Insert before "nextdev".
 283                  */
 284                 curdev->next = nextdev;
 285
 286                 /*
 287                  * Insert after "prevdev" - unless "prevdev" is null,
 288                  * in which case this is the first interface.
 289                  */
 290                 if (prevdev == NULL) {
 291                         /*
 292                          * This is the first interface.  Pass back a
 293                          * pointer to it, and put "curdev" before
 294                          * "nextdev".
 295                          */
 296                         *alldevs = curdev;
 297                 } else
 298                         prevdev->next = curdev;
 299         }
 300
 301         *curdev_ret = curdev;
 302         return (0);
 303 }
 304
 305 int
 306 add_addr_to_iflist(pcap_if_t **alldevs, const char *name, u_int flags,
 307     struct sockaddr *addr, size_t addr_size,
 308     struct sockaddr *netmask, size_t netmask_size,
 309     struct sockaddr *broadaddr, size_t broadaddr_size,
 310     struct sockaddr *dstaddr, size_t dstaddr_size,
 311     char *errbuf)
 312 {
 313         pcap_if_t *curdev;
 314         pcap_addr_t *curaddr, *prevaddr, *nextaddr;
 315
 316         if (add_or_find_if(&curdev, alldevs, name, flags, NULL, errbuf) == -1) {
 317                 /*
 318                  * Error - give up.
 319                  */
 320                 return (-1);
 321         }
 322         if (curdev == NULL) {
 323                 /*
 324                  * Device wasn't added because it can't be opened.
 325                  * Not a fatal error.
 326                  */
 327                 return (0);
 328         }
 329
 330         /*
 331          * "curdev" is an entry for this interface; add an entry for this
 332          * address to its list of addresses.
 333          *
 334          * Allocate the new entry and fill it in.
 335          */
 336         curaddr = malloc(sizeof(pcap_addr_t));
 337         if (curaddr == NULL) {
 338                 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 339                     "malloc: %s", pcap_strerror(errno));
 340                 return (-1);
 341         }
 342
 343         curaddr->next = NULL;
 344         if (addr != NULL) {
 345                 curaddr->addr = dup_sockaddr(addr, addr_size);
 346                 if (curaddr->addr == NULL) {
 347                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 348                             "malloc: %s", pcap_strerror(errno));
 349                         free(curaddr);
 350                         return (-1);
 351                 }
 352         } else
 353                 curaddr->addr = NULL;
 354
 355         if (netmask != NULL) {
 356                 curaddr->netmask = dup_sockaddr(netmask, netmask_size);
 357                 if (curaddr->netmask == NULL) {
 358                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 359                             "malloc: %s", pcap_strerror(errno));
 360                         free(curaddr);
 361                         return (-1);
 362                 }
 363         } else
 364                 curaddr->netmask = NULL;
 365
 366         if (broadaddr != NULL) {
 367                 curaddr->broadaddr = dup_sockaddr(broadaddr, broadaddr_size);
 368                 if (curaddr->broadaddr == NULL) {
 369                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 370                             "malloc: %s", pcap_strerror(errno));
 371                         free(curaddr);
 372                         return (-1);
 373                 }
 374         } else
 375                 curaddr->broadaddr = NULL;
 376
 377         if (dstaddr != NULL) {
 378                 curaddr->dstaddr = dup_sockaddr(dstaddr, dstaddr_size);
 379                 if (curaddr->dstaddr == NULL) {
 380                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 381                             "malloc: %s", pcap_strerror(errno));
 382                         free(curaddr);
 383                         return (-1);
 384                 }
 385         } else
 386                 curaddr->dstaddr = NULL;
 387
 388         /*
 389          * Find the end of the list of addresses.
 390          */
 391         for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
 392                 nextaddr = prevaddr->next;
 393                 if (nextaddr == NULL) {
 394                         /*
 395                          * This is the end of the list.
 396                          */
 397                         break;
 398                 }
 399         }
 400
 401         if (prevaddr == NULL) {
 402                 /*
 403                  * The list was empty; this is the first member.
 404                  */
 405                 curdev->addresses = curaddr;
 406         } else {
 407                 /*
 408                  * "prevaddr" is the last member of the list; append
 409                  * this member to it.
 410                  */
 411                 prevaddr->next = curaddr;
 412         }
 413
 414         return (0);
 415 }
 416
 417 int
 418 pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags,
 419     const char *description, char *errbuf)
 420 {
 421         pcap_if_t *curdev;
 422
 423         return (add_or_find_if(&curdev, devlist, name, flags, description,
 424             errbuf));
 425 }
 426
 427
 428 /*
 429  * Free a list of interfaces.
 430  */
 431 void
 432 pcap_freealldevs(pcap_if_t *alldevs)
 433 {
 434         pcap_if_t *curdev, *nextdev;
 435         pcap_addr_t *curaddr, *nextaddr;
 436
 437         for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
 438                 nextdev = curdev->next;
 439
 440                 /*
 441                  * Free all addresses.
 442                  */
 443                 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
 444                         nextaddr = curaddr->next;
 445                         if (curaddr->addr)
 446                                 free(curaddr->addr);
 447                         if (curaddr->netmask)
 448                                 free(curaddr->netmask);
 449                         if (curaddr->broadaddr)
 450                                 free(curaddr->broadaddr);
 451                         if (curaddr->dstaddr)
 452                                 free(curaddr->dstaddr);
 453                         free(curaddr);
 454                 }
 455
 456                 /*
 457                  * Free the name string.
 458                  */
 459                 free(curdev->name);
 460
 461                 /*
 462                  * Free the description string, if any.
 463                  */
 464                 if (curdev->description != NULL)
 465                         free(curdev->description);
 466
 467                 /*
 468                  * Free the interface.
 469                  */
 470                 free(curdev);
 471         }
 472 }
 473
 474 #if !defined(WIN32) && !defined(MSDOS)
 475
 476 /*
 477  * Return the name of a network interface attached to the system, or NULL
 478  * if none can be found.  The interface must be configured up; the
 479  * lowest unit number is preferred; loopback is ignored.
 480  */
 481 char *
 482 pcap_lookupdev(errbuf)
 483         register char *errbuf;
 484 {
 485         pcap_if_t *alldevs;
 486 /* for old BSD systems, including bsdi3 */
 487 #ifndef IF_NAMESIZE
 488 #define IF_NAMESIZE IFNAMSIZ
 489 #endif
 490         static char device[IF_NAMESIZE + 1];
 491         char *ret;
 492
 493         if (pcap_findalldevs(&alldevs, errbuf) == -1)
 494                 return (NULL);
 495
 496         if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
 497                 /*
 498                  * There are no devices on the list, or the first device
 499                  * on the list is a loopback device, which means there
 500                  * are no non-loopback devices on the list.  This means
 501                  * we can't return any device.
 502                  *
 503                  * XXX - why not return a loopback device?  If we can't
 504                  * capture on it, it won't be on the list, and if it's
 505                  * on the list, there aren't any non-loopback devices,
 506                  * so why not just supply it as the default device?
 507                  */
 508                 (void)strlcpy(errbuf, "no suitable device found",
 509                     PCAP_ERRBUF_SIZE);
 510                 ret = NULL;
 511         } else {
 512                 /*
 513                  * Return the name of the first device on the list.
 514                  */
 515                 (void)strlcpy(device, alldevs->name, sizeof(device));
 516                 ret = device;
 517         }
 518
 519         pcap_freealldevs(alldevs);
 520         return (ret);
 521 }
 522
 523 int
 524 pcap_lookupnet(device, netp, maskp, errbuf)
 525         register const char *device;
 526         register bpf_u_int32 *netp, *maskp;
 527         register char *errbuf;
 528 {
 529         register int fd;
 530         register struct sockaddr_in *sin;
 531         struct ifreq ifr;
 532
 533         /*
 534          * The pseudo-device "any" listens on all interfaces and therefore
 535          * has the network address and -mask "0.0.0.0" therefore catching
 536          * all traffic. Using NULL for the interface is the same as "any".
 537          */
 538         if (!device || strcmp(device, "any") == 0
 539 #ifdef HAVE_DAG_API
 540             || strstr(device, "dag") != NULL
 541 #endif
 542             ) {
 543                 *netp = *maskp = 0;
 544                 return 0;
 545         }
 546
 547         fd = socket(AF_INET, SOCK_DGRAM, 0);
 548         if (fd < 0) {
 549                 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
 550                     pcap_strerror(errno));
 551                 return (-1);
 552         }
 553         memset(&ifr, 0, sizeof(ifr));
 554 #ifdef linux
 555         /* XXX Work around Linux kernel bug */
 556         ifr.ifr_addr.sa_family = AF_INET;
 557 #endif
 558         (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
 559         if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
 560                 if (errno == EADDRNOTAVAIL) {
 561                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 562                             "%s: no IPv4 address assigned", device);
 563                 } else {
 564                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 565                             "SIOCGIFADDR: %s: %s",
 566                             device, pcap_strerror(errno));
 567                 }
 568                 (void)close(fd);
 569                 return (-1);
 570         }
 571         sin = (struct sockaddr_in *)&ifr.ifr_addr;
 572         *netp = sin->sin_addr.s_addr;
 573         if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
 574                 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 575                     "SIOCGIFNETMASK: %s: %s", device, pcap_strerror(errno));
 576                 (void)close(fd);
 577                 return (-1);
 578         }
 579         (void)close(fd);
 580         *maskp = sin->sin_addr.s_addr;
 581         if (*maskp == 0) {
 582                 if (IN_CLASSA(*netp))
 583                         *maskp = IN_CLASSA_NET;
 584                 else if (IN_CLASSB(*netp))
 585                         *maskp = IN_CLASSB_NET;
 586                 else if (IN_CLASSC(*netp))
 587                         *maskp = IN_CLASSC_NET;
 588                 else {
 589                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 590                             "inet class for 0x%x unknown", *netp);
 591                         return (-1);
 592                 }
 593         }
 594         *netp &= *maskp;
 595         return (0);
 596 }
 597
 598 #elif defined(WIN32)
 599
 600 /*
 601  * Return the name of a network interface attached to the system, or NULL
 602  * if none can be found.  The interface must be configured up; the
 603  * lowest unit number is preferred; loopback is ignored.
 604  */
 605 char *
 606 pcap_lookupdev(errbuf)
 607         register char *errbuf;
 608 {
 609         DWORD dwVersion;
 610         DWORD dwWindowsMajorVersion;
 611         dwVersion = GetVersion();       /* get the OS version */
 612         dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
 613
 614         if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) {
 615                 /*
 616                  * Windows 95, 98, ME.
 617                  */
 618                 ULONG NameLength = 8192;
 619                 static char AdaptersName[8192];
 620
 621                 if (PacketGetAdapterNames(AdaptersName,&NameLength) )
 622                         return (AdaptersName);
 623                 else
 624                         return NULL;
 625         } else {
 626                 /*
 627                  * Windows NT (NT 4.0, W2K, WXP). Convert the names to UNICODE for backward compatibility
 628                  */
 629                 ULONG NameLength = 8192;
 630                 static WCHAR AdaptersName[8192];
 631                 char *tAstr;
 632                 WCHAR *tUstr;
 633                 WCHAR *TAdaptersName = (WCHAR*)malloc(8192 * sizeof(WCHAR));
 634                 int NAdapts = 0;
 635
 636                 if(TAdaptersName == NULL)
 637                 {
 638                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure");
 639                         return NULL;
 640                 }
 641
 642                 if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) )
 643                 {
 644                         (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
 645                                 "PacketGetAdapterNames: %s",
 646                                 pcap_win32strerror());
 647                         free(TAdaptersName);
 648                         return NULL;
 649                 }
 650
 651
 652                 tAstr = (char*)TAdaptersName;
 653                 tUstr = (WCHAR*)AdaptersName;
 654
 655                 /*
 656                  * Convert and copy the device names
 657                  */
 658                 while(sscanf(tAstr, "%S", tUstr) > 0)
 659                 {
 660                         tAstr += strlen(tAstr) + 1;
 661                         tUstr += wcslen(tUstr) + 1;
 662                         NAdapts ++;
 663                 }
 664
 665                 tAstr++;
 666                 *tUstr = 0;
 667                 tUstr++;
 668
 669                 /*
 670                  * Copy the descriptions
 671                  */
 672                 while(NAdapts--)
 673                 {
 674                         strcpy((char*)tUstr, tAstr);
 675                         (char*)tUstr += strlen(tAstr) + 1;;
 676                         tAstr += strlen(tAstr) + 1;
 677                 }
 678
 679                 free(TAdaptersName);
 680                 return (char *)(AdaptersName);
 681         }
 682 }
 683
 684
 685 int
 686 pcap_lookupnet(device, netp, maskp, errbuf)
 687         register const char *device;
 688         register bpf_u_int32 *netp, *maskp;
 689         register char *errbuf;
 690 {
 691         /*
 692          * We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo()
 693          * in order to skip non IPv4 (i.e. IPv6 addresses)
 694          */
 695         npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
 696         LONG if_addr_size = 1;
 697         struct sockaddr_in *t_addr;
 698         unsigned int i;
 699
 700         if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) {
 701                 *netp = *maskp = 0;
 702                 return (0);
 703         }
 704
 705         for(i=0; i<MAX_NETWORK_ADDRESSES; i++)
 706         {
 707                 if(if_addrs[i].IPAddress.ss_family == AF_INET)
 708                 {
 709                         t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress);
 710                         *netp = t_addr->sin_addr.S_un.S_addr;
 711                         t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask);
 712                         *maskp = t_addr->sin_addr.S_un.S_addr;
 713
 714                         *netp &= *maskp;
 715                         return (0);
 716                 }
 717
 718         }
 719
 720         *netp = *maskp = 0;
 721         return (0);
 722 }
 723
 724 #endif /* !WIN32 && !MSDOS */