contrib/libpcap/pcap-npf.c

   1 /*
   2  * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
   3  * Copyright (c) 2005 - 2010 CACE Technologies, Davis (California)
   4  * 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  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  * notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the Politecnico di Torino, CACE Technologies
  16  * nor the names of its contributors may be used to endorse or promote
  17  * products derived from this software without specific prior written
  18  * permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <errno.h>
  39 #define PCAP_DONT_INCLUDE_PCAP_BPF_H
  40 #include <Packet32.h>
  41 #include <pcap-int.h>
  42 #include <pcap/dlt.h>
  43
  44 /* Old-school MinGW have these headers in a different place.
  45  */
  46 #if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
  47   #include <ddk/ntddndis.h>
  48   #include <ddk/ndis.h>
  49 #else
  50   #include <ntddndis.h>  /* MSVC/TDM-MinGW/MinGW64 */
  51 #endif
  52
  53 #ifdef HAVE_DAG_API
  54   #include <dagnew.h>
  55   #include <dagapi.h>
  56 #endif /* HAVE_DAG_API */
  57
  58 static int pcap_setfilter_npf(pcap_t *, struct bpf_program *);
  59 static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *);
  60 static int pcap_getnonblock_npf(pcap_t *);
  61 static int pcap_setnonblock_npf(pcap_t *, int);
  62
  63 /*dimension of the buffer in the pcap_t structure*/
  64 #define WIN32_DEFAULT_USER_BUFFER_SIZE 256000
  65
  66 /*dimension of the buffer in the kernel driver NPF */
  67 #define WIN32_DEFAULT_KERNEL_BUFFER_SIZE 1000000
  68
  69 /* Equivalent to ntohs(), but a lot faster under Windows */
  70 #define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
  71
  72 /*
  73  * Private data for capturing on WinPcap/Npcap devices.
  74  */
  75 struct pcap_win {
  76         ADAPTER *adapter;               /* the packet32 ADAPTER for the device */
  77         int nonblock;
  78         int rfmon_selfstart;            /* a flag tells whether the monitor mode is set by itself */
  79         int filtering_in_kernel;        /* using kernel filter */
  80
  81 #ifdef HAVE_DAG_API
  82         int     dag_fcs_bits;           /* Number of checksum bits from link layer */
  83 #endif
  84
  85 #ifdef ENABLE_REMOTE
  86         int samp_npkt;                  /* parameter needed for sampling, with '1 out of N' method has been requested */
  87         struct timeval samp_time;       /* parameter needed for sampling, with '1 every N ms' method has been requested */
  88 #endif
  89 };
  90
  91 /*
  92  * Define stub versions of the monitor-mode support routines if this
  93  * isn't Npcap. HAVE_NPCAP_PACKET_API is defined by Npcap but not
  94  * WinPcap.
  95  */
  96 #ifndef HAVE_NPCAP_PACKET_API
  97 static int
  98 PacketIsMonitorModeSupported(PCHAR AdapterName _U_)
  99 {
 100         /*
 101          * We don't support monitor mode.
 102          */
 103         return (0);
 104 }
 105
 106 static int
 107 PacketSetMonitorMode(PCHAR AdapterName _U_, int mode _U_)
 108 {
 109         /*
 110          * This should never be called, as PacketIsMonitorModeSupported()
 111          * will return 0, meaning "we don't support monitor mode, so
 112          * don't try to turn it on or off".
 113          */
 114         return (0);
 115 }
 116
 117 static int
 118 PacketGetMonitorMode(PCHAR AdapterName _U_)
 119 {
 120         /*
 121          * This should fail, so that pcap_activate_npf() returns
 122          * PCAP_ERROR_RFMON_NOTSUP if our caller requested monitor
 123          * mode.
 124          */
 125         return (-1);
 126 }
 127 #endif
 128
 129 /*
 130  * Sigh.  PacketRequest() will have made a DeviceIoControl()
 131  * call to the NPF driver to perform the OID request, with a
 132  * BIOCQUERYOID ioctl.  The kernel code should get back one
 133  * of NDIS_STATUS_INVALID_OID, NDIS_STATUS_NOT_SUPPORTED,
 134  * or NDIS_STATUS_NOT_RECOGNIZED if the OID request isn't
 135  * supported by the OS or the driver, but that doesn't seem
 136  * to make it to the caller of PacketRequest() in a
 137  * reliable fashion.
 138  */
 139 #define NDIS_STATUS_INVALID_OID         0xc0010017
 140 #define NDIS_STATUS_NOT_SUPPORTED       0xc00000bb      /* STATUS_NOT_SUPPORTED */
 141 #define NDIS_STATUS_NOT_RECOGNIZED      0x00010001
 142
 143 static int
 144 oid_get_request(ADAPTER *adapter, bpf_u_int32 oid, void *data, size_t *lenp,
 145     char *errbuf)
 146 {
 147         PACKET_OID_DATA *oid_data_arg;
 148
 149         /*
 150          * Allocate a PACKET_OID_DATA structure to hand to PacketRequest().
 151          * It should be big enough to hold "*lenp" bytes of data; it
 152          * will actually be slightly larger, as PACKET_OID_DATA has a
 153          * 1-byte data array at the end, standing in for the variable-length
 154          * data that's actually there.
 155          */
 156         oid_data_arg = malloc(sizeof (PACKET_OID_DATA) + *lenp);
 157         if (oid_data_arg == NULL) {
 158                 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
 159                     "Couldn't allocate argument buffer for PacketRequest");
 160                 return (PCAP_ERROR);
 161         }
 162
 163         /*
 164          * No need to copy the data - we're doing a fetch.
 165          */
 166         oid_data_arg->Oid = oid;
 167         oid_data_arg->Length = (ULONG)(*lenp);  /* XXX - check for ridiculously large value? */
 168         if (!PacketRequest(adapter, FALSE, oid_data_arg)) {
 169                 pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE,
 170                     GetLastError(), "Error calling PacketRequest");
 171                 free(oid_data_arg);
 172                 return (-1);
 173         }
 174
 175         /*
 176          * Get the length actually supplied.
 177          */
 178         *lenp = oid_data_arg->Length;
 179
 180         /*
 181          * Copy back the data we fetched.
 182          */
 183         memcpy(data, oid_data_arg->Data, *lenp);
 184         free(oid_data_arg);
 185         return (0);
 186 }
 187
 188 static int
 189 pcap_stats_npf(pcap_t *p, struct pcap_stat *ps)
 190 {
 191         struct pcap_win *pw = p->priv;
 192         struct bpf_stat bstats;
 193
 194         /*
 195          * Try to get statistics.
 196          *
 197          * (Please note - "struct pcap_stat" is *not* the same as
 198          * WinPcap's "struct bpf_stat". It might currently have the
 199          * same layout, but let's not cheat.
 200          *
 201          * Note also that we don't fill in ps_capt, as we might have
 202          * been called by code compiled against an earlier version of
 203          * WinPcap that didn't have ps_capt, in which case filling it
 204          * in would stomp on whatever comes after the structure passed
 205          * to us.
 206          */
 207         if (!PacketGetStats(pw->adapter, &bstats)) {
 208                 pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE,
 209                     GetLastError(), "PacketGetStats error");
 210                 return (-1);
 211         }
 212         ps->ps_recv = bstats.bs_recv;
 213         ps->ps_drop = bstats.bs_drop;
 214
 215         /*
 216          * XXX - PacketGetStats() doesn't fill this in, so we just
 217          * return 0.
 218          */
 219 #if 0
 220         ps->ps_ifdrop = bstats.ps_ifdrop;
 221 #else
 222         ps->ps_ifdrop = 0;
 223 #endif
 224
 225         return (0);
 226 }
 227
 228 /*
 229  * Win32-only routine for getting statistics.
 230  *
 231  * This way is definitely safer than passing the pcap_stat * from the userland.
 232  * In fact, there could happen than the user allocates a variable which is not
 233  * big enough for the new structure, and the library will write in a zone
 234  * which is not allocated to this variable.
 235  *
 236  * In this way, we're pretty sure we are writing on memory allocated to this
 237  * variable.
 238  *
 239  * XXX - but this is the wrong way to handle statistics.  Instead, we should
 240  * have an API that returns data in a form like the Options section of a
 241  * pcapng Interface Statistics Block:
 242  *
 243  *    http://xml2rfc.tools.ietf.org/cgi-bin/xml2rfc.cgi?url=https://raw.githubusercontent.com/pcapng/pcapng/master/draft-tuexen-opsawg-pcapng.xml&modeAsFormat=html/ascii&type=ascii#rfc.section.4.6
 244  *
 245  * which would let us add new statistics straightforwardly and indicate which
 246  * statistics we are and are *not* providing, rather than having to provide
 247  * possibly-bogus values for statistics we can't provide.
 248  */
 249 struct pcap_stat *
 250 pcap_stats_ex_npf(pcap_t *p, int *pcap_stat_size)
 251 {
 252         struct pcap_win *pw = p->priv;
 253         struct bpf_stat bstats;
 254
 255         *pcap_stat_size = sizeof (p->stat);
 256
 257         /*
 258          * Try to get statistics.
 259          *
 260          * (Please note - "struct pcap_stat" is *not* the same as
 261          * WinPcap's "struct bpf_stat". It might currently have the
 262          * same layout, but let's not cheat.)
 263          */
 264         if (!PacketGetStatsEx(pw->adapter, &bstats)) {
 265                 pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE,
 266                     GetLastError(), "PacketGetStatsEx error");
 267                 return (NULL);
 268         }
 269         p->stat.ps_recv = bstats.bs_recv;
 270         p->stat.ps_drop = bstats.bs_drop;
 271         p->stat.ps_ifdrop = bstats.ps_ifdrop;
 272 #ifdef ENABLE_REMOTE
 273         p->stat.ps_capt = bstats.bs_capt;
 274 #endif
 275         return (&p->stat);
 276 }
 277
 278 /* Set the dimension of the kernel-level capture buffer */
 279 static int
 280 pcap_setbuff_npf(pcap_t *p, int dim)
 281 {
 282         struct pcap_win *pw = p->priv;
 283
 284         if(PacketSetBuff(pw->adapter,dim)==FALSE)
 285         {
 286                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 287                 return (-1);
 288         }
 289         return (0);
 290 }
 291
 292 /* Set the driver working mode */
 293 static int
 294 pcap_setmode_npf(pcap_t *p, int mode)
 295 {
 296         struct pcap_win *pw = p->priv;
 297
 298         if(PacketSetMode(pw->adapter,mode)==FALSE)
 299         {
 300                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 301                 return (-1);
 302         }
 303
 304         return (0);
 305 }
 306
 307 /*set the minimum amount of data that will release a read call*/
 308 static int
 309 pcap_setmintocopy_npf(pcap_t *p, int size)
 310 {
 311         struct pcap_win *pw = p->priv;
 312
 313         if(PacketSetMinToCopy(pw->adapter, size)==FALSE)
 314         {
 315                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 316                 return (-1);
 317         }
 318         return (0);
 319 }
 320
 321 static HANDLE
 322 pcap_getevent_npf(pcap_t *p)
 323 {
 324         struct pcap_win *pw = p->priv;
 325
 326         return (PacketGetReadEvent(pw->adapter));
 327 }
 328
 329 static int
 330 pcap_oid_get_request_npf(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp)
 331 {
 332         struct pcap_win *pw = p->priv;
 333
 334         return (oid_get_request(pw->adapter, oid, data, lenp, p->errbuf));
 335 }
 336
 337 static int
 338 pcap_oid_set_request_npf(pcap_t *p, bpf_u_int32 oid, const void *data,
 339     size_t *lenp)
 340 {
 341         struct pcap_win *pw = p->priv;
 342         PACKET_OID_DATA *oid_data_arg;
 343
 344         /*
 345          * Allocate a PACKET_OID_DATA structure to hand to PacketRequest().
 346          * It should be big enough to hold "*lenp" bytes of data; it
 347          * will actually be slightly larger, as PACKET_OID_DATA has a
 348          * 1-byte data array at the end, standing in for the variable-length
 349          * data that's actually there.
 350          */
 351         oid_data_arg = malloc(sizeof (PACKET_OID_DATA) + *lenp);
 352         if (oid_data_arg == NULL) {
 353                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 354                     "Couldn't allocate argument buffer for PacketRequest");
 355                 return (PCAP_ERROR);
 356         }
 357
 358         oid_data_arg->Oid = oid;
 359         oid_data_arg->Length = (ULONG)(*lenp);  /* XXX - check for ridiculously large value? */
 360         memcpy(oid_data_arg->Data, data, *lenp);
 361         if (!PacketRequest(pw->adapter, TRUE, oid_data_arg)) {
 362                 pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE,
 363                     GetLastError(), "Error calling PacketRequest");
 364                 free(oid_data_arg);
 365                 return (PCAP_ERROR);
 366         }
 367
 368         /*
 369          * Get the length actually copied.
 370          */
 371         *lenp = oid_data_arg->Length;
 372
 373         /*
 374          * No need to copy the data - we're doing a set.
 375          */
 376         free(oid_data_arg);
 377         return (0);
 378 }
 379
 380 static u_int
 381 pcap_sendqueue_transmit_npf(pcap_t *p, pcap_send_queue *queue, int sync)
 382 {
 383         struct pcap_win *pw = p->priv;
 384         u_int res;
 385
 386         if (pw->adapter==NULL) {
 387                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 388                     "Cannot transmit a queue to an offline capture or to a TurboCap port");
 389                 return (0);
 390         }
 391
 392         res = PacketSendPackets(pw->adapter,
 393                 queue->buffer,
 394                 queue->len,
 395                 (BOOLEAN)sync);
 396
 397         if(res != queue->len){
 398                 pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE,
 399                     GetLastError(), "Error opening adapter");
 400         }
 401
 402         return (res);
 403 }
 404
 405 static int
 406 pcap_setuserbuffer_npf(pcap_t *p, int size)
 407 {
 408         unsigned char *new_buff;
 409
 410         if (size<=0) {
 411                 /* Bogus parameter */
 412                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 413                     "Error: invalid size %d",size);
 414                 return (-1);
 415         }
 416
 417         /* Allocate the buffer */
 418         new_buff=(unsigned char*)malloc(sizeof(char)*size);
 419
 420         if (!new_buff) {
 421                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 422                     "Error: not enough memory");
 423                 return (-1);
 424         }
 425
 426         free(p->buffer);
 427
 428         p->buffer=new_buff;
 429         p->bufsize=size;
 430
 431         return (0);
 432 }
 433
 434 static int
 435 pcap_live_dump_npf(pcap_t *p, char *filename, int maxsize, int maxpacks)
 436 {
 437         struct pcap_win *pw = p->priv;
 438         BOOLEAN res;
 439
 440         /* Set the packet driver in dump mode */
 441         res = PacketSetMode(pw->adapter, PACKET_MODE_DUMP);
 442         if(res == FALSE){
 443                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 444                     "Error setting dump mode");
 445                 return (-1);
 446         }
 447
 448         /* Set the name of the dump file */
 449         res = PacketSetDumpName(pw->adapter, filename, (int)strlen(filename));
 450         if(res == FALSE){
 451                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 452                     "Error setting kernel dump file name");
 453                 return (-1);
 454         }
 455
 456         /* Set the limits of the dump file */
 457         res = PacketSetDumpLimits(pw->adapter, maxsize, maxpacks);
 458         if(res == FALSE) {
 459                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 460                                 "Error setting dump limit");
 461                 return (-1);
 462         }
 463
 464         return (0);
 465 }
 466
 467 static int
 468 pcap_live_dump_ended_npf(pcap_t *p, int sync)
 469 {
 470         struct pcap_win *pw = p->priv;
 471
 472         return (PacketIsDumpEnded(pw->adapter, (BOOLEAN)sync));
 473 }
 474
 475 static PAirpcapHandle
 476 pcap_get_airpcap_handle_npf(pcap_t *p)
 477 {
 478 #ifdef HAVE_AIRPCAP_API
 479         struct pcap_win *pw = p->priv;
 480
 481         return (PacketGetAirPcapHandle(pw->adapter));
 482 #else
 483         return (NULL);
 484 #endif /* HAVE_AIRPCAP_API */
 485 }
 486
 487 static int
 488 pcap_read_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 489 {
 490         PACKET Packet;
 491         int cc;
 492         int n = 0;
 493         register u_char *bp, *ep;
 494         u_char *datap;
 495         struct pcap_win *pw = p->priv;
 496
 497         cc = p->cc;
 498         if (p->cc == 0) {
 499                 /*
 500                  * Has "pcap_breakloop()" been called?
 501                  */
 502                 if (p->break_loop) {
 503                         /*
 504                          * Yes - clear the flag that indicates that it
 505                          * has, and return PCAP_ERROR_BREAK to indicate
 506                          * that we were told to break out of the loop.
 507                          */
 508                         p->break_loop = 0;
 509                         return (PCAP_ERROR_BREAK);
 510                 }
 511
 512                 /*
 513                  * Capture the packets.
 514                  *
 515                  * The PACKET structure had a bunch of extra stuff for
 516                  * Windows 9x/Me, but the only interesting data in it
 517                  * in the versions of Windows that we support is just
 518                  * a copy of p->buffer, a copy of p->buflen, and the
 519                  * actual number of bytes read returned from
 520                  * PacketReceivePacket(), none of which has to be
 521                  * retained from call to call, so we just keep one on
 522                  * the stack.
 523                  */
 524                 PacketInitPacket(&Packet, (BYTE *)p->buffer, p->bufsize);
 525                 if (!PacketReceivePacket(pw->adapter, &Packet, TRUE)) {
 526                         /*
 527                          * Did the device go away?
 528                          * If so, the error we get is ERROR_GEN_FAILURE.
 529                          */
 530                         DWORD errcode = GetLastError();
 531
 532                         if (errcode == ERROR_GEN_FAILURE) {
 533                                 /*
 534                                  * The device on which we're capturing
 535                                  * went away, or it became unusable
 536                                  * by NPF due to a suspend/resume.
 537                                  *
 538                                  * XXX - hopefully no other error
 539                                  * conditions are indicated by this.
 540                                  *
 541                                  * XXX - we really should return an
 542                                  * appropriate error for that, but
 543                                  * pcap_dispatch() etc. aren't
 544                                  * documented as having error returns
 545                                  * other than PCAP_ERROR or PCAP_ERROR_BREAK.
 546                                  */
 547                                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 548                                     "The interface disappeared");
 549                         } else {
 550                                 pcap_fmt_errmsg_for_win32_err(p->errbuf,
 551                                     PCAP_ERRBUF_SIZE, errcode,
 552                                     "PacketReceivePacket error");
 553                         }
 554                         return (PCAP_ERROR);
 555                 }
 556
 557                 cc = Packet.ulBytesReceived;
 558
 559                 bp = p->buffer;
 560         }
 561         else
 562                 bp = p->bp;
 563
 564         /*
 565          * Loop through each packet.
 566          */
 567 #define bhp ((struct bpf_hdr *)bp)
 568         ep = bp + cc;
 569         for (;;) {
 570                 register int caplen, hdrlen;
 571
 572                 /*
 573                  * Has "pcap_breakloop()" been called?
 574                  * If so, return immediately - if we haven't read any
 575                  * packets, clear the flag and return PCAP_ERROR_BREAK
 576                  * to indicate that we were told to break out of the loop,
 577                  * otherwise leave the flag set, so that the *next* call
 578                  * will break out of the loop without having read any
 579                  * packets, and return the number of packets we've
 580                  * processed so far.
 581                  */
 582                 if (p->break_loop) {
 583                         if (n == 0) {
 584                                 p->break_loop = 0;
 585                                 return (PCAP_ERROR_BREAK);
 586                         } else {
 587                                 p->bp = bp;
 588                                 p->cc = (int) (ep - bp);
 589                                 return (n);
 590                         }
 591                 }
 592                 if (bp >= ep)
 593                         break;
 594
 595                 caplen = bhp->bh_caplen;
 596                 hdrlen = bhp->bh_hdrlen;
 597                 datap = bp + hdrlen;
 598
 599                 /*
 600                  * Short-circuit evaluation: if using BPF filter
 601                  * in kernel, no need to do it now - we already know
 602                  * the packet passed the filter.
 603                  *
 604                  * XXX - bpf_filter() should always return TRUE if
 605                  * handed a null pointer for the program, but it might
 606                  * just try to "run" the filter, so we check here.
 607                  */
 608                 if (pw->filtering_in_kernel ||
 609                     p->fcode.bf_insns == NULL ||
 610                     bpf_filter(p->fcode.bf_insns, datap, bhp->bh_datalen, caplen)) {
 611 #ifdef ENABLE_REMOTE
 612                         switch (p->rmt_samp.method) {
 613
 614                         case PCAP_SAMP_1_EVERY_N:
 615                                 pw->samp_npkt = (pw->samp_npkt + 1) % p->rmt_samp.value;
 616
 617                                 /* Discard all packets that are not '1 out of N' */
 618                                 if (pw->samp_npkt != 0) {
 619                                         bp += Packet_WORDALIGN(caplen + hdrlen);
 620                                         continue;
 621                                 }
 622                                 break;
 623
 624                         case PCAP_SAMP_FIRST_AFTER_N_MS:
 625                             {
 626                                 struct pcap_pkthdr *pkt_header = (struct pcap_pkthdr*) bp;
 627
 628                                 /*
 629                                  * Check if the timestamp of the arrived
 630                                  * packet is smaller than our target time.
 631                                  */
 632                                 if (pkt_header->ts.tv_sec < pw->samp_time.tv_sec ||
 633                                    (pkt_header->ts.tv_sec == pw->samp_time.tv_sec && pkt_header->ts.tv_usec < pw->samp_time.tv_usec)) {
 634                                         bp += Packet_WORDALIGN(caplen + hdrlen);
 635                                         continue;
 636                                 }
 637
 638                                 /*
 639                                  * The arrived packet is suitable for being
 640                                  * delivered to our caller, so let's update
 641                                  * the target time.
 642                                  */
 643                                 pw->samp_time.tv_usec = pkt_header->ts.tv_usec + p->rmt_samp.value * 1000;
 644                                 if (pw->samp_time.tv_usec > 1000000) {
 645                                         pw->samp_time.tv_sec = pkt_header->ts.tv_sec + pw->samp_time.tv_usec / 1000000;
 646                                         pw->samp_time.tv_usec = pw->samp_time.tv_usec % 1000000;
 647                                 }
 648                             }
 649                         }
 650 #endif  /* ENABLE_REMOTE */
 651
 652                         /*
 653                          * XXX A bpf_hdr matches a pcap_pkthdr.
 654                          */
 655                         (*callback)(user, (struct pcap_pkthdr*)bp, datap);
 656                         bp += Packet_WORDALIGN(caplen + hdrlen);
 657                         if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
 658                                 p->bp = bp;
 659                                 p->cc = (int) (ep - bp);
 660                                 return (n);
 661                         }
 662                 } else {
 663                         /*
 664                          * Skip this packet.
 665                          */
 666                         bp += Packet_WORDALIGN(caplen + hdrlen);
 667                 }
 668         }
 669 #undef bhp
 670         p->cc = 0;
 671         return (n);
 672 }
 673
 674 #ifdef HAVE_DAG_API
 675 static int
 676 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 677 {
 678         struct pcap_win *pw = p->priv;
 679         PACKET Packet;
 680         u_char *dp = NULL;
 681         int     packet_len = 0, caplen = 0;
 682         struct pcap_pkthdr      pcap_header;
 683         u_char *endofbuf;
 684         int n = 0;
 685         dag_record_t *header;
 686         unsigned erf_record_len;
 687         ULONGLONG ts;
 688         int cc;
 689         unsigned swt;
 690         unsigned dfp = pw->adapter->DagFastProcess;
 691
 692         cc = p->cc;
 693         if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
 694         {
 695                 /*
 696                  * Get new packets from the network.
 697                  *
 698                  * The PACKET structure had a bunch of extra stuff for
 699                  * Windows 9x/Me, but the only interesting data in it
 700                  * in the versions of Windows that we support is just
 701                  * a copy of p->buffer, a copy of p->buflen, and the
 702                  * actual number of bytes read returned from
 703                  * PacketReceivePacket(), none of which has to be
 704                  * retained from call to call, so we just keep one on
 705                  * the stack.
 706                  */
 707                 PacketInitPacket(&Packet, (BYTE *)p->buffer, p->bufsize);
 708                 if (!PacketReceivePacket(pw->adapter, &Packet, TRUE)) {
 709                         pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 710                         return (-1);
 711                 }
 712
 713                 cc = Packet.ulBytesReceived;
 714                 if(cc == 0)
 715                         /* The timeout has expired but we no packets arrived */
 716                         return (0);
 717                 header = (dag_record_t*)pw->adapter->DagBuffer;
 718         }
 719         else
 720                 header = (dag_record_t*)p->bp;
 721
 722         endofbuf = (char*)header + cc;
 723
 724         /*
 725          * Cycle through the packets
 726          */
 727         do
 728         {
 729                 erf_record_len = SWAPS(header->rlen);
 730                 if((char*)header + erf_record_len > endofbuf)
 731                         break;
 732
 733                 /* Increase the number of captured packets */
 734                 p->stat.ps_recv++;
 735
 736                 /* Find the beginning of the packet */
 737                 dp = ((u_char *)header) + dag_record_size;
 738
 739                 /* Determine actual packet len */
 740                 switch(header->type)
 741                 {
 742                 case TYPE_ATM:
 743                         packet_len = ATM_SNAPLEN;
 744                         caplen = ATM_SNAPLEN;
 745                         dp += 4;
 746
 747                         break;
 748
 749                 case TYPE_ETH:
 750                         swt = SWAPS(header->wlen);
 751                         packet_len = swt - (pw->dag_fcs_bits);
 752                         caplen = erf_record_len - dag_record_size - 2;
 753                         if (caplen > packet_len)
 754                         {
 755                                 caplen = packet_len;
 756                         }
 757                         dp += 2;
 758
 759                         break;
 760
 761                 case TYPE_HDLC_POS:
 762                         swt = SWAPS(header->wlen);
 763                         packet_len = swt - (pw->dag_fcs_bits);
 764                         caplen = erf_record_len - dag_record_size;
 765                         if (caplen > packet_len)
 766                         {
 767                                 caplen = packet_len;
 768                         }
 769
 770                         break;
 771                 }
 772
 773                 if(caplen > p->snapshot)
 774                         caplen = p->snapshot;
 775
 776                 /*
 777                  * Has "pcap_breakloop()" been called?
 778                  * If so, return immediately - if we haven't read any
 779                  * packets, clear the flag and return -2 to indicate
 780                  * that we were told to break out of the loop, otherwise
 781                  * leave the flag set, so that the *next* call will break
 782                  * out of the loop without having read any packets, and
 783                  * return the number of packets we've processed so far.
 784                  */
 785                 if (p->break_loop)
 786                 {
 787                         if (n == 0)
 788                         {
 789                                 p->break_loop = 0;
 790                                 return (-2);
 791                         }
 792                         else
 793                         {
 794                                 p->bp = (char*)header;
 795                                 p->cc = endofbuf - (char*)header;
 796                                 return (n);
 797                         }
 798                 }
 799
 800                 if(!dfp)
 801                 {
 802                         /* convert between timestamp formats */
 803                         ts = header->ts;
 804                         pcap_header.ts.tv_sec = (int)(ts >> 32);
 805                         ts = (ts & 0xffffffffi64) * 1000000;
 806                         ts += 0x80000000; /* rounding */
 807                         pcap_header.ts.tv_usec = (int)(ts >> 32);
 808                         if (pcap_header.ts.tv_usec >= 1000000) {
 809                                 pcap_header.ts.tv_usec -= 1000000;
 810                                 pcap_header.ts.tv_sec++;
 811                         }
 812                 }
 813
 814                 /* No underlaying filtering system. We need to filter on our own */
 815                 if (p->fcode.bf_insns)
 816                 {
 817                         if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
 818                         {
 819                                 /* Move to next packet */
 820                                 header = (dag_record_t*)((char*)header + erf_record_len);
 821                                 continue;
 822                         }
 823                 }
 824
 825                 /* Fill the header for the user suppplied callback function */
 826                 pcap_header.caplen = caplen;
 827                 pcap_header.len = packet_len;
 828
 829                 /* Call the callback function */
 830                 (*callback)(user, &pcap_header, dp);
 831
 832                 /* Move to next packet */
 833                 header = (dag_record_t*)((char*)header + erf_record_len);
 834
 835                 /* Stop if the number of packets requested by user has been reached*/
 836                 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
 837                 {
 838                         p->bp = (char*)header;
 839                         p->cc = endofbuf - (char*)header;
 840                         return (n);
 841                 }
 842         }
 843         while((u_char*)header < endofbuf);
 844
 845         return (1);
 846 }
 847 #endif /* HAVE_DAG_API */
 848
 849 /* Send a packet to the network */
 850 static int
 851 pcap_inject_npf(pcap_t *p, const void *buf, size_t size)
 852 {
 853         struct pcap_win *pw = p->priv;
 854         PACKET pkt;
 855
 856         PacketInitPacket(&pkt, (PVOID)buf, size);
 857         if(PacketSendPacket(pw->adapter,&pkt,TRUE) == FALSE) {
 858                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
 859                 return (-1);
 860         }
 861
 862         /*
 863          * We assume it all got sent if "PacketSendPacket()" succeeded.
 864          * "pcap_inject()" is expected to return the number of bytes
 865          * sent.
 866          */
 867         return ((int)size);
 868 }
 869
 870 static void
 871 pcap_cleanup_npf(pcap_t *p)
 872 {
 873         struct pcap_win *pw = p->priv;
 874
 875         if (pw->adapter != NULL) {
 876                 PacketCloseAdapter(pw->adapter);
 877                 pw->adapter = NULL;
 878         }
 879         if (pw->rfmon_selfstart)
 880         {
 881                 PacketSetMonitorMode(p->opt.device, 0);
 882         }
 883         pcap_cleanup_live_common(p);
 884 }
 885
 886 static int
 887 pcap_activate_npf(pcap_t *p)
 888 {
 889         struct pcap_win *pw = p->priv;
 890         NetType type;
 891         int res;
 892         int status = 0;
 893
 894         if (p->opt.rfmon) {
 895                 /*
 896                  * Monitor mode is supported on Windows Vista and later.
 897                  */
 898                 if (PacketGetMonitorMode(p->opt.device) == 1)
 899                 {
 900                         pw->rfmon_selfstart = 0;
 901                 }
 902                 else
 903                 {
 904                         if ((res = PacketSetMonitorMode(p->opt.device, 1)) != 1)
 905                         {
 906                                 pw->rfmon_selfstart = 0;
 907                                 // Monitor mode is not supported.
 908                                 if (res == 0)
 909                                 {
 910                                         return PCAP_ERROR_RFMON_NOTSUP;
 911                                 }
 912                                 else
 913                                 {
 914                                         return PCAP_ERROR;
 915                                 }
 916                         }
 917                         else
 918                         {
 919                                 pw->rfmon_selfstart = 1;
 920                         }
 921                 }
 922         }
 923
 924         /* Init WinSock */
 925         pcap_wsockinit();
 926
 927         pw->adapter = PacketOpenAdapter(p->opt.device);
 928
 929         if (pw->adapter == NULL)
 930         {
 931                 DWORD errcode = GetLastError();
 932
 933                 /*
 934                  * What error did we get when trying to open the adapter?
 935                  */
 936                 if (errcode == ERROR_BAD_UNIT) {
 937                         /*
 938                          * There's no such device.
 939                          */
 940                         return (PCAP_ERROR_NO_SUCH_DEVICE);
 941                 } else {
 942                         /*
 943                          * Unknown - report details.
 944                          */
 945                         pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE,
 946                             errcode, "Error opening adapter");
 947                         if (pw->rfmon_selfstart)
 948                         {
 949                                 PacketSetMonitorMode(p->opt.device, 0);
 950                         }
 951                         return (PCAP_ERROR);
 952                 }
 953         }
 954
 955         /*get network type*/
 956         if(PacketGetNetType (pw->adapter,&type) == FALSE)
 957         {
 958                 pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE,
 959                     GetLastError(), "Cannot determine the network type");
 960                 goto bad;
 961         }
 962
 963         /*Set the linktype*/
 964         switch (type.LinkType)
 965         {
 966         case NdisMediumWan:
 967                 p->linktype = DLT_EN10MB;
 968                 break;
 969
 970         case NdisMedium802_3:
 971                 p->linktype = DLT_EN10MB;
 972                 /*
 973                  * This is (presumably) a real Ethernet capture; give it a
 974                  * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
 975                  * that an application can let you choose it, in case you're
 976                  * capturing DOCSIS traffic that a Cisco Cable Modem
 977                  * Termination System is putting out onto an Ethernet (it
 978                  * doesn't put an Ethernet header onto the wire, it puts raw
 979                  * DOCSIS frames out on the wire inside the low-level
 980                  * Ethernet framing).
 981                  */
 982                 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
 983                 /*
 984                  * If that fails, just leave the list empty.
 985                  */
 986                 if (p->dlt_list != NULL) {
 987                         p->dlt_list[0] = DLT_EN10MB;
 988                         p->dlt_list[1] = DLT_DOCSIS;
 989                         p->dlt_count = 2;
 990                 }
 991                 break;
 992
 993         case NdisMediumFddi:
 994                 p->linktype = DLT_FDDI;
 995                 break;
 996
 997         case NdisMedium802_5:
 998                 p->linktype = DLT_IEEE802;
 999                 break;
1000
1001         case NdisMediumArcnetRaw:
1002                 p->linktype = DLT_ARCNET;
1003                 break;
1004
1005         case NdisMediumArcnet878_2:
1006                 p->linktype = DLT_ARCNET;
1007                 break;
1008
1009         case NdisMediumAtm:
1010                 p->linktype = DLT_ATM_RFC1483;
1011                 break;
1012
1013         case NdisMediumCHDLC:
1014                 p->linktype = DLT_CHDLC;
1015                 break;
1016
1017         case NdisMediumPPPSerial:
1018                 p->linktype = DLT_PPP_SERIAL;
1019                 break;
1020
1021         case NdisMediumNull:
1022                 p->linktype = DLT_NULL;
1023                 break;
1024
1025         case NdisMediumBare80211:
1026                 p->linktype = DLT_IEEE802_11;
1027                 break;
1028
1029         case NdisMediumRadio80211:
1030                 p->linktype = DLT_IEEE802_11_RADIO;
1031                 break;
1032
1033         case NdisMediumPpi:
1034                 p->linktype = DLT_PPI;
1035                 break;
1036
1037 #ifdef NdisMediumWirelessWan
1038         case NdisMediumWirelessWan:
1039                 p->linktype = DLT_RAW;
1040                 break;
1041 #endif
1042
1043         default:
1044                 /*
1045                  * An unknown medium type is assumed to supply Ethernet
1046                  * headers; if not, the user will have to report it,
1047                  * so that the medium type and link-layer header type
1048                  * can be determined.  If we were to fail here, we
1049                  * might get the link-layer type in the error, but
1050                  * the user wouldn't get a capture, so we wouldn't
1051                  * be able to determine the link-layer type; we report
1052                  * a warning with the link-layer type, so at least
1053                  * some programs will report the warning.
1054                  */
1055                 p->linktype = DLT_EN10MB;
1056                 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1057                     "Unknown NdisMedium value %d, defaulting to DLT_EN10MB",
1058                     type.LinkType);
1059                 status = PCAP_WARNING;
1060                 break;
1061         }
1062
1063         /*
1064          * Turn a negative snapshot value (invalid), a snapshot value of
1065          * 0 (unspecified), or a value bigger than the normal maximum
1066          * value, into the maximum allowed value.
1067          *
1068          * If some application really *needs* a bigger snapshot
1069          * length, we should just increase MAXIMUM_SNAPLEN.
1070          */
1071         if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
1072                 p->snapshot = MAXIMUM_SNAPLEN;
1073
1074         /* Set promiscuous mode */
1075         if (p->opt.promisc)
1076         {
1077
1078                 if (PacketSetHwFilter(pw->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
1079                 {
1080                         pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
1081                         goto bad;
1082                 }
1083         }
1084         else
1085         {
1086                 /* NDIS_PACKET_TYPE_ALL_LOCAL selects "All packets sent by installed
1087                  * protocols and all packets indicated by the NIC" but if no protocol
1088                  * drivers (like TCP/IP) are installed, NDIS_PACKET_TYPE_DIRECTED,
1089                  * NDIS_PACKET_TYPE_BROADCAST, and NDIS_PACKET_TYPE_MULTICAST are needed to
1090                  * capture incoming frames.
1091                  */
1092                 if (PacketSetHwFilter(pw->adapter,
1093                         NDIS_PACKET_TYPE_ALL_LOCAL |
1094                         NDIS_PACKET_TYPE_DIRECTED |
1095                         NDIS_PACKET_TYPE_BROADCAST |
1096                         NDIS_PACKET_TYPE_MULTICAST) == FALSE)
1097                 {
1098                         pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
1099                         goto bad;
1100                 }
1101         }
1102
1103         /* Set the buffer size */
1104         p->bufsize = WIN32_DEFAULT_USER_BUFFER_SIZE;
1105
1106         if(!(pw->adapter->Flags & INFO_FLAG_DAG_CARD))
1107         {
1108         /*
1109          * Traditional Adapter
1110          */
1111                 /*
1112                  * If the buffer size wasn't explicitly set, default to
1113                  * WIN32_DEFAULT_KERNEL_BUFFER_SIZE.
1114                  */
1115                 if (p->opt.buffer_size == 0)
1116                         p->opt.buffer_size = WIN32_DEFAULT_KERNEL_BUFFER_SIZE;
1117
1118                 if(PacketSetBuff(pw->adapter,p->opt.buffer_size)==FALSE)
1119                 {
1120                         pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
1121                         goto bad;
1122                 }
1123
1124                 p->buffer = malloc(p->bufsize);
1125                 if (p->buffer == NULL)
1126                 {
1127                         pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
1128                             errno, "malloc");
1129                         goto bad;
1130                 }
1131
1132                 if (p->opt.immediate)
1133                 {
1134                         /* tell the driver to copy the buffer as soon as data arrives */
1135                         if(PacketSetMinToCopy(pw->adapter,0)==FALSE)
1136                         {
1137                                 pcap_fmt_errmsg_for_win32_err(p->errbuf,
1138                                     PCAP_ERRBUF_SIZE, GetLastError(),
1139                                     "Error calling PacketSetMinToCopy");
1140                                 goto bad;
1141                         }
1142                 }
1143                 else
1144                 {
1145                         /* tell the driver to copy the buffer only if it contains at least 16K */
1146                         if(PacketSetMinToCopy(pw->adapter,16000)==FALSE)
1147                         {
1148                                 pcap_fmt_errmsg_for_win32_err(p->errbuf,
1149                                     PCAP_ERRBUF_SIZE, GetLastError(),
1150                                     "Error calling PacketSetMinToCopy");
1151                                 goto bad;
1152                         }
1153                 }
1154         } else {
1155                 /*
1156                  * Dag Card
1157                  */
1158 #ifdef HAVE_DAG_API
1159                 /*
1160                  * We have DAG support.
1161                  */
1162                 LONG    status;
1163                 HKEY    dagkey;
1164                 DWORD   lptype;
1165                 DWORD   lpcbdata;
1166                 int             postype = 0;
1167                 char    keyname[512];
1168
1169                 pcap_snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
1170                         "SYSTEM\\CurrentControlSet\\Services\\DAG",
1171                         strstr(_strlwr(p->opt.device), "dag"));
1172                 do
1173                 {
1174                         status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
1175                         if(status != ERROR_SUCCESS)
1176                                 break;
1177
1178                         status = RegQueryValueEx(dagkey,
1179                                 "PosType",
1180                                 NULL,
1181                                 &lptype,
1182                                 (char*)&postype,
1183                                 &lpcbdata);
1184
1185                         if(status != ERROR_SUCCESS)
1186                         {
1187                                 postype = 0;
1188                         }
1189
1190                         RegCloseKey(dagkey);
1191                 }
1192                 while(FALSE);
1193
1194
1195                 p->snapshot = PacketSetSnapLen(pw->adapter, p->snapshot);
1196
1197                 /* Set the length of the FCS associated to any packet. This value
1198                  * will be subtracted to the packet length */
1199                 pw->dag_fcs_bits = pw->adapter->DagFcsLen;
1200 #else /* HAVE_DAG_API */
1201                 /*
1202                  * No DAG support.
1203                  */
1204                 goto bad;
1205 #endif /* HAVE_DAG_API */
1206         }
1207
1208         PacketSetReadTimeout(pw->adapter, p->opt.timeout);
1209
1210         /* disable loopback capture if requested */
1211         if (p->opt.nocapture_local)
1212         {
1213                 if (!PacketSetLoopbackBehavior(pw->adapter, NPF_DISABLE_LOOPBACK))
1214                 {
1215                         pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1216                             "Unable to disable the capture of loopback packets.");
1217                         goto bad;
1218                 }
1219         }
1220
1221 #ifdef HAVE_DAG_API
1222         if(pw->adapter->Flags & INFO_FLAG_DAG_CARD)
1223         {
1224                 /* install dag specific handlers for read and setfilter */
1225                 p->read_op = pcap_read_win32_dag;
1226                 p->setfilter_op = pcap_setfilter_win32_dag;
1227         }
1228         else
1229         {
1230 #endif /* HAVE_DAG_API */
1231                 /* install traditional npf handlers for read and setfilter */
1232                 p->read_op = pcap_read_npf;
1233                 p->setfilter_op = pcap_setfilter_npf;
1234 #ifdef HAVE_DAG_API
1235         }
1236 #endif /* HAVE_DAG_API */
1237         p->setdirection_op = NULL;      /* Not implemented. */
1238             /* XXX - can this be implemented on some versions of Windows? */
1239         p->inject_op = pcap_inject_npf;
1240         p->set_datalink_op = NULL;      /* can't change data link type */
1241         p->getnonblock_op = pcap_getnonblock_npf;
1242         p->setnonblock_op = pcap_setnonblock_npf;
1243         p->stats_op = pcap_stats_npf;
1244         p->stats_ex_op = pcap_stats_ex_npf;
1245         p->setbuff_op = pcap_setbuff_npf;
1246         p->setmode_op = pcap_setmode_npf;
1247         p->setmintocopy_op = pcap_setmintocopy_npf;
1248         p->getevent_op = pcap_getevent_npf;
1249         p->oid_get_request_op = pcap_oid_get_request_npf;
1250         p->oid_set_request_op = pcap_oid_set_request_npf;
1251         p->sendqueue_transmit_op = pcap_sendqueue_transmit_npf;
1252         p->setuserbuffer_op = pcap_setuserbuffer_npf;
1253         p->live_dump_op = pcap_live_dump_npf;
1254         p->live_dump_ended_op = pcap_live_dump_ended_npf;
1255         p->get_airpcap_handle_op = pcap_get_airpcap_handle_npf;
1256         p->cleanup_op = pcap_cleanup_npf;
1257
1258         /*
1259          * XXX - this is only done because WinPcap supported
1260          * pcap_fileno() returning the hFile HANDLE from the
1261          * ADAPTER structure.  We make no general guarantees
1262          * that the caller can do anything useful with it.
1263          *
1264          * (Not that we make any general guarantee of that
1265          * sort on UN*X, either, any more, given that not
1266          * all capture devices are regular OS network
1267          * interfaces.)
1268          */
1269         p->handle = pw->adapter->hFile;
1270
1271         return (status);
1272 bad:
1273         pcap_cleanup_npf(p);
1274         return (PCAP_ERROR);
1275 }
1276
1277 /*
1278 * Check if rfmon mode is supported on the pcap_t for Windows systems.
1279 */
1280 static int
1281 pcap_can_set_rfmon_npf(pcap_t *p)
1282 {
1283         return (PacketIsMonitorModeSupported(p->opt.device) == 1);
1284 }
1285
1286 pcap_t *
1287 pcap_create_interface(const char *device _U_, char *ebuf)
1288 {
1289         pcap_t *p;
1290
1291         p = pcap_create_common(ebuf, sizeof(struct pcap_win));
1292         if (p == NULL)
1293                 return (NULL);
1294
1295         p->activate_op = pcap_activate_npf;
1296         p->can_set_rfmon_op = pcap_can_set_rfmon_npf;
1297         return (p);
1298 }
1299
1300 static int
1301 pcap_setfilter_npf(pcap_t *p, struct bpf_program *fp)
1302 {
1303         struct pcap_win *pw = p->priv;
1304
1305         if(PacketSetBpf(pw->adapter,fp)==FALSE){
1306                 /*
1307                  * Kernel filter not installed.
1308                  *
1309                  * XXX - we don't know whether this failed because:
1310                  *
1311                  *  the kernel rejected the filter program as invalid,
1312                  *  in which case we should fall back on userland
1313                  *  filtering;
1314                  *
1315                  *  the kernel rejected the filter program as too big,
1316                  *  in which case we should again fall back on
1317                  *  userland filtering;
1318                  *
1319                  *  there was some other problem, in which case we
1320                  *  should probably report an error.
1321                  *
1322                  * For NPF devices, the Win32 status will be
1323                  * STATUS_INVALID_DEVICE_REQUEST for invalid
1324                  * filters, but I don't know what it'd be for
1325                  * other problems, and for some other devices
1326                  * it might not be set at all.
1327                  *
1328                  * So we just fall back on userland filtering in
1329                  * all cases.
1330                  */
1331
1332                 /*
1333                  * install_bpf_program() validates the program.
1334                  *
1335                  * XXX - what if we already have a filter in the kernel?
1336                  */
1337                 if (install_bpf_program(p, fp) < 0)
1338                         return (-1);
1339                 pw->filtering_in_kernel = 0;    /* filtering in userland */
1340                 return (0);
1341         }
1342
1343         /*
1344          * It worked.
1345          */
1346         pw->filtering_in_kernel = 1;    /* filtering in the kernel */
1347
1348         /*
1349          * Discard any previously-received packets, as they might have
1350          * passed whatever filter was formerly in effect, but might
1351          * not pass this filter (BIOCSETF discards packets buffered
1352          * in the kernel, so you can lose packets in any case).
1353          */
1354         p->cc = 0;
1355         return (0);
1356 }
1357
1358 /*
1359  * We filter at user level, since the kernel driver does't process the packets
1360  */
1361 static int
1362 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
1363
1364         if(!fp)
1365         {
1366                 pcap_strlcpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
1367                 return (-1);
1368         }
1369
1370         /* Install a user level filter */
1371         if (install_bpf_program(p, fp) < 0)
1372                 return (-1);
1373
1374         return (0);
1375 }
1376
1377 static int
1378 pcap_getnonblock_npf(pcap_t *p)
1379 {
1380         struct pcap_win *pw = p->priv;
1381
1382         /*
1383          * XXX - if there were a PacketGetReadTimeout() call, we
1384          * would use it, and return 1 if the timeout is -1
1385          * and 0 otherwise.
1386          */
1387         return (pw->nonblock);
1388 }
1389
1390 static int
1391 pcap_setnonblock_npf(pcap_t *p, int nonblock)
1392 {
1393         struct pcap_win *pw = p->priv;
1394         int newtimeout;
1395
1396         if (nonblock) {
1397                 /*
1398                  * Set the packet buffer timeout to -1 for non-blocking
1399                  * mode.
1400                  */
1401                 newtimeout = -1;
1402         } else {
1403                 /*
1404                  * Restore the timeout set when the device was opened.
1405                  * (Note that this may be -1, in which case we're not
1406                  * really leaving non-blocking mode.  However, although
1407                  * the timeout argument to pcap_set_timeout() and
1408                  * pcap_open_live() is an int, you're not supposed to
1409                  * supply a negative value, so that "shouldn't happen".)
1410                  */
1411                 newtimeout = p->opt.timeout;
1412         }
1413         if (!PacketSetReadTimeout(pw->adapter, newtimeout)) {
1414                 pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE,
1415                     GetLastError(), "PacketSetReadTimeout");
1416                 return (-1);
1417         }
1418         pw->nonblock = (newtimeout == -1);
1419         return (0);
1420 }
1421
1422 static int
1423 pcap_add_if_npf(pcap_if_list_t *devlistp, char *name, bpf_u_int32 flags,
1424     const char *description, char *errbuf)
1425 {
1426         pcap_if_t *curdev;
1427         npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
1428         LONG if_addr_size;
1429         int res = 0;
1430
1431         if_addr_size = MAX_NETWORK_ADDRESSES;
1432
1433         /*
1434          * Add an entry for this interface, with no addresses.
1435          */
1436         curdev = add_dev(devlistp, name, flags, description, errbuf);
1437         if (curdev == NULL) {
1438                 /*
1439                  * Failure.
1440                  */
1441                 return (-1);
1442         }
1443
1444         /*
1445          * Get the list of addresses for the interface.
1446          */
1447         if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) {
1448                 /*
1449                  * Failure.
1450                  *
1451                  * We don't return an error, because this can happen with
1452                  * NdisWan interfaces, and we want to supply them even
1453                  * if we can't supply their addresses.
1454                  *
1455                  * We return an entry with an empty address list.
1456                  */
1457                 return (0);
1458         }
1459
1460         /*
1461          * Now add the addresses.
1462          */
1463         while (if_addr_size-- > 0) {
1464                 /*
1465                  * "curdev" is an entry for this interface; add an entry for
1466                  * this address to its list of addresses.
1467                  */
1468                 res = add_addr_to_dev(curdev,
1469                     (struct sockaddr *)&if_addrs[if_addr_size].IPAddress,
1470                     sizeof (struct sockaddr_storage),
1471                     (struct sockaddr *)&if_addrs[if_addr_size].SubnetMask,
1472                     sizeof (struct sockaddr_storage),
1473                     (struct sockaddr *)&if_addrs[if_addr_size].Broadcast,
1474                     sizeof (struct sockaddr_storage),
1475                     NULL,
1476                     0,
1477                     errbuf);
1478                 if (res == -1) {
1479                         /*
1480                          * Failure.
1481                          */
1482                         break;
1483                 }
1484         }
1485
1486         return (res);
1487 }
1488
1489 static int
1490 get_if_flags(const char *name, bpf_u_int32 *flags, char *errbuf)
1491 {
1492         char *name_copy;
1493         ADAPTER *adapter;
1494         int status;
1495         size_t len;
1496         NDIS_HARDWARE_STATUS hardware_status;
1497 #ifdef OID_GEN_PHYSICAL_MEDIUM
1498         NDIS_PHYSICAL_MEDIUM phys_medium;
1499         bpf_u_int32 gen_physical_medium_oids[] = {
1500   #ifdef OID_GEN_PHYSICAL_MEDIUM_EX
1501                 OID_GEN_PHYSICAL_MEDIUM_EX,
1502   #endif
1503                 OID_GEN_PHYSICAL_MEDIUM
1504         };
1505 #define N_GEN_PHYSICAL_MEDIUM_OIDS      (sizeof gen_physical_medium_oids / sizeof gen_physical_medium_oids[0])
1506         size_t i;
1507 #endif /* OID_GEN_PHYSICAL_MEDIUM */
1508 #ifdef OID_GEN_LINK_STATE
1509         NDIS_LINK_STATE link_state;
1510 #endif
1511         int connect_status;
1512
1513         if (*flags & PCAP_IF_LOOPBACK) {
1514                 /*
1515                  * Loopback interface, so the connection status doesn't
1516                  * apply. and it's not wireless (or wired, for that
1517                  * matter...).  We presume it's up and running.
1518                  */
1519                 *flags |= PCAP_IF_UP | PCAP_IF_RUNNING | PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE;
1520                 return (0);
1521         }
1522
1523         /*
1524          * We need to open the adapter to get this information.
1525          *
1526          * XXX - PacketOpenAdapter() takes a non-const pointer
1527          * as an argument, so we make a copy of the argument and
1528          * pass that to it.
1529          */
1530         name_copy = strdup(name);
1531         adapter = PacketOpenAdapter(name_copy);
1532         free(name_copy);
1533         if (adapter == NULL) {
1534                 /*
1535                  * Give up; if they try to open this device, it'll fail.
1536                  */
1537                 return (0);
1538         }
1539
1540 #ifdef HAVE_AIRPCAP_API
1541         /*
1542          * Airpcap.sys do not support the below 'OID_GEN_x' values.
1543          * Just set these flags (and none of the '*flags' entered with).
1544          */
1545         if (PacketGetAirPcapHandle(adapter)) {
1546                 /*
1547                  * Must be "up" and "running" if the above if succeeded.
1548                  */
1549                 *flags = PCAP_IF_UP | PCAP_IF_RUNNING;
1550
1551                 /*
1552                  * An airpcap device is a wireless device (duh!)
1553                  */
1554                 *flags |= PCAP_IF_WIRELESS;
1555
1556                 /*
1557                  * A "network assosiation state" makes no sense for airpcap.
1558                  */
1559                 *flags |= PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE;
1560                 PacketCloseAdapter(adapter);
1561                 return (0);
1562         }
1563 #endif
1564
1565         /*
1566          * Get the hardware status, and derive "up" and "running" from
1567          * that.
1568          */
1569         len = sizeof (hardware_status);
1570         status = oid_get_request(adapter, OID_GEN_HARDWARE_STATUS,
1571             &hardware_status, &len, errbuf);
1572         if (status == 0) {
1573                 switch (hardware_status) {
1574
1575                 case NdisHardwareStatusReady:
1576                         /*
1577                          * "Available and capable of sending and receiving
1578                          * data over the wire", so up and running.
1579                          */
1580                         *flags |= PCAP_IF_UP | PCAP_IF_RUNNING;
1581                         break;
1582
1583                 case NdisHardwareStatusInitializing:
1584                 case NdisHardwareStatusReset:
1585                         /*
1586                          * "Initializing" or "Resetting", so up, but
1587                          * not running.
1588                          */
1589                         *flags |= PCAP_IF_UP;
1590                         break;
1591
1592                 case NdisHardwareStatusClosing:
1593                 case NdisHardwareStatusNotReady:
1594                         /*
1595                          * "Closing" or "Not ready", so neither up nor
1596                          * running.
1597                          */
1598                         break;
1599                 }
1600         } else {
1601                 /*
1602                  * Can't get the hardware status, so assume both up and
1603                  * running.
1604                  */
1605                 *flags |= PCAP_IF_UP | PCAP_IF_RUNNING;
1606         }
1607
1608         /*
1609          * Get the network type.
1610          */
1611 #ifdef OID_GEN_PHYSICAL_MEDIUM
1612         /*
1613          * Try the OIDs we have for this, in order.
1614          */
1615         for (i = 0; i < N_GEN_PHYSICAL_MEDIUM_OIDS; i++) {
1616                 len = sizeof (phys_medium);
1617                 status = oid_get_request(adapter, gen_physical_medium_oids[i],
1618                     &phys_medium, &len, errbuf);
1619                 if (status == 0) {
1620                         /*
1621                          * Success.
1622                          */
1623                         break;
1624                 }
1625                 /*
1626                  * Failed.  We can't determine whether it failed
1627                  * because that particular OID isn't supported
1628                  * or because some other problem occurred, so we
1629                  * just drive on and try the next OID.
1630                  */
1631         }
1632         if (status == 0) {
1633                 /*
1634                  * We got the physical medium.
1635                  */
1636                 switch (phys_medium) {
1637
1638                 case NdisPhysicalMediumWirelessLan:
1639                 case NdisPhysicalMediumWirelessWan:
1640                 case NdisPhysicalMediumNative802_11:
1641                 case NdisPhysicalMediumBluetooth:
1642                 case NdisPhysicalMediumUWB:
1643                 case NdisPhysicalMediumIrda:
1644                         /*
1645                          * Wireless.
1646                          */
1647                         *flags |= PCAP_IF_WIRELESS;
1648                         break;
1649
1650                 default:
1651                         /*
1652                          * Not wireless.
1653                          */
1654                         break;
1655                 }
1656         }
1657 #endif
1658
1659         /*
1660          * Get the connection status.
1661          */
1662 #ifdef OID_GEN_LINK_STATE
1663         len = sizeof(link_state);
1664         status = oid_get_request(adapter, OID_GEN_LINK_STATE, &link_state,
1665             &len, errbuf);
1666         if (status == 0) {
1667                 /*
1668                  * NOTE: this also gives us the receive and transmit
1669                  * link state.
1670                  */
1671                 switch (link_state.MediaConnectState) {
1672
1673                 case MediaConnectStateConnected:
1674                         /*
1675                          * It's connected.
1676                          */
1677                         *flags |= PCAP_IF_CONNECTION_STATUS_CONNECTED;
1678                         break;
1679
1680                 case MediaConnectStateDisconnected:
1681                         /*
1682                          * It's disconnected.
1683                          */
1684                         *flags |= PCAP_IF_CONNECTION_STATUS_DISCONNECTED;
1685                         break;
1686                 }
1687         }
1688 #else
1689         /*
1690          * OID_GEN_LINK_STATE isn't supported because it's not in our SDK.
1691          */
1692         status = -1;
1693 #endif
1694         if (status == -1) {
1695                 /*
1696                  * OK, OID_GEN_LINK_STATE didn't work, try
1697                  * OID_GEN_MEDIA_CONNECT_STATUS.
1698                  */
1699                 status = oid_get_request(adapter, OID_GEN_MEDIA_CONNECT_STATUS,
1700                     &connect_status, &len, errbuf);
1701                 if (status == 0) {
1702                         switch (connect_status) {
1703
1704                         case NdisMediaStateConnected:
1705                                 /*
1706                                  * It's connected.
1707                                  */
1708                                 *flags |= PCAP_IF_CONNECTION_STATUS_CONNECTED;
1709                                 break;
1710
1711                         case NdisMediaStateDisconnected:
1712                                 /*
1713                                  * It's disconnected.
1714                                  */
1715                                 *flags |= PCAP_IF_CONNECTION_STATUS_DISCONNECTED;
1716                                 break;
1717                         }
1718                 }
1719         }
1720         PacketCloseAdapter(adapter);
1721         return (0);
1722 }
1723
1724 int
1725 pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
1726 {
1727         int ret = 0;
1728         const char *desc;
1729         char *AdaptersName;
1730         ULONG NameLength;
1731         char *name;
1732
1733         /*
1734          * Find out how big a buffer we need.
1735          *
1736          * This call should always return FALSE; if the error is
1737          * ERROR_INSUFFICIENT_BUFFER, NameLength will be set to
1738          * the size of the buffer we need, otherwise there's a
1739          * problem, and NameLength should be set to 0.
1740          *
1741          * It shouldn't require NameLength to be set, but,
1742          * at least as of WinPcap 4.1.3, it checks whether
1743          * NameLength is big enough before it checks for a
1744          * NULL buffer argument, so, while it'll still do
1745          * the right thing if NameLength is uninitialized and
1746          * whatever junk happens to be there is big enough
1747          * (because the pointer argument will be null), it's
1748          * still reading an uninitialized variable.
1749          */
1750         NameLength = 0;
1751         if (!PacketGetAdapterNames(NULL, &NameLength))
1752         {
1753                 DWORD last_error = GetLastError();
1754
1755                 if (last_error != ERROR_INSUFFICIENT_BUFFER)
1756                 {
1757                         pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE,
1758                             last_error, "PacketGetAdapterNames");
1759                         return (-1);
1760                 }
1761         }
1762
1763         if (NameLength <= 0)
1764                 return 0;
1765         AdaptersName = (char*) malloc(NameLength);
1766         if (AdaptersName == NULL)
1767         {
1768                 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
1769                 return (-1);
1770         }
1771
1772         if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
1773                 pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE,
1774                     GetLastError(), "PacketGetAdapterNames");
1775                 free(AdaptersName);
1776                 return (-1);
1777         }
1778
1779         /*
1780          * "PacketGetAdapterNames()" returned a list of
1781          * null-terminated ASCII interface name strings,
1782          * terminated by a null string, followed by a list
1783          * of null-terminated ASCII interface description
1784          * strings, terminated by a null string.
1785          * This means there are two ASCII nulls at the end
1786          * of the first list.
1787          *
1788          * Find the end of the first list; that's the
1789          * beginning of the second list.
1790          */
1791         desc = &AdaptersName[0];
1792         while (*desc != '\0' || *(desc + 1) != '\0')
1793                 desc++;
1794
1795         /*
1796          * Found it - "desc" points to the first of the two
1797          * nulls at the end of the list of names, so the
1798          * first byte of the list of descriptions is two bytes
1799          * after it.
1800          */
1801         desc += 2;
1802
1803         /*
1804          * Loop over the elements in the first list.
1805          */
1806         name = &AdaptersName[0];
1807         while (*name != '\0') {
1808                 bpf_u_int32 flags = 0;
1809 #ifdef HAVE_PACKET_IS_LOOPBACK_ADAPTER
1810                 /*
1811                  * Is this a loopback interface?
1812                  */
1813                 if (PacketIsLoopbackAdapter(name)) {
1814                         /* Yes */
1815                         flags |= PCAP_IF_LOOPBACK;
1816                 }
1817 #endif
1818                 /*
1819                  * Get additional flags.
1820                  */
1821                 if (get_if_flags(name, &flags, errbuf) == -1) {
1822                         /*
1823                          * Failure.
1824                          */
1825                         ret = -1;
1826                         break;
1827                 }
1828
1829                 /*
1830                  * Add an entry for this interface.
1831                  */
1832                 if (pcap_add_if_npf(devlistp, name, flags, desc,
1833                     errbuf) == -1) {
1834                         /*
1835                          * Failure.
1836                          */
1837                         ret = -1;
1838                         break;
1839                 }
1840                 name += strlen(name) + 1;
1841                 desc += strlen(desc) + 1;
1842         }
1843
1844         free(AdaptersName);
1845         return (ret);
1846 }
1847
1848 /*
1849  * Return the name of a network interface attached to the system, or NULL
1850  * if none can be found.  The interface must be configured up; the
1851  * lowest unit number is preferred; loopback is ignored.
1852  *
1853  * In the best of all possible worlds, this would be the same as on
1854  * UN*X, but there may be software that expects this to return a
1855  * full list of devices after the first device.
1856  */
1857 #define ADAPTERSNAME_LEN        8192
1858 char *
1859 pcap_lookupdev(char *errbuf)
1860 {
1861         DWORD dwVersion;
1862         DWORD dwWindowsMajorVersion;
1863
1864 #pragma warning (push)
1865 #pragma warning (disable: 4996) /* disable MSVC's GetVersion() deprecated warning here */
1866         dwVersion = GetVersion();       /* get the OS version */
1867 #pragma warning (pop)
1868         dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
1869
1870         if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) {
1871                 /*
1872                  * Windows 95, 98, ME.
1873                  */
1874                 ULONG NameLength = ADAPTERSNAME_LEN;
1875                 static char AdaptersName[ADAPTERSNAME_LEN];
1876
1877                 if (PacketGetAdapterNames(AdaptersName,&NameLength) )
1878                         return (AdaptersName);
1879                 else
1880                         return NULL;
1881         } else {
1882                 /*
1883                  * Windows NT (NT 4.0 and later).
1884                  * Convert the names to Unicode for backward compatibility.
1885                  */
1886                 ULONG NameLength = ADAPTERSNAME_LEN;
1887                 static WCHAR AdaptersName[ADAPTERSNAME_LEN];
1888                 size_t BufferSpaceLeft;
1889                 char *tAstr;
1890                 WCHAR *Unameptr;
1891                 char *Adescptr;
1892                 size_t namelen, i;
1893                 WCHAR *TAdaptersName = (WCHAR*)malloc(ADAPTERSNAME_LEN * sizeof(WCHAR));
1894                 int NAdapts = 0;
1895
1896                 if(TAdaptersName == NULL)
1897                 {
1898                         (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure");
1899                         return NULL;
1900                 }
1901
1902                 if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) )
1903                 {
1904                         pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE,
1905                             GetLastError(), "PacketGetAdapterNames");
1906                         free(TAdaptersName);
1907                         return NULL;
1908                 }
1909
1910
1911                 BufferSpaceLeft = ADAPTERSNAME_LEN * sizeof(WCHAR);
1912                 tAstr = (char*)TAdaptersName;
1913                 Unameptr = AdaptersName;
1914
1915                 /*
1916                  * Convert the device names to Unicode into AdapterName.
1917                  */
1918                 do {
1919                         /*
1920                          * Length of the name, including the terminating
1921                          * NUL.
1922                          */
1923                         namelen = strlen(tAstr) + 1;
1924
1925                         /*
1926                          * Do we have room for the name in the Unicode
1927                          * buffer?
1928                          */
1929                         if (BufferSpaceLeft < namelen * sizeof(WCHAR)) {
1930                                 /*
1931                                  * No.
1932                                  */
1933                                 goto quit;
1934                         }
1935                         BufferSpaceLeft -= namelen * sizeof(WCHAR);
1936
1937                         /*
1938                          * Copy the name, converting ASCII to Unicode.
1939                          * namelen includes the NUL, so we copy it as
1940                          * well.
1941                          */
1942                         for (i = 0; i < namelen; i++)
1943                                 *Unameptr++ = *tAstr++;
1944
1945                         /*
1946                          * Count this adapter.
1947                          */
1948                         NAdapts++;
1949                 } while (namelen != 1);
1950
1951                 /*
1952                  * Copy the descriptions, but don't convert them from
1953                  * ASCII to Unicode.
1954                  */
1955                 Adescptr = (char *)Unameptr;
1956                 while(NAdapts--)
1957                 {
1958                         size_t desclen;
1959
1960                         desclen = strlen(tAstr) + 1;
1961
1962                         /*
1963                          * Do we have room for the name in the Unicode
1964                          * buffer?
1965                          */
1966                         if (BufferSpaceLeft < desclen) {
1967                                 /*
1968                                  * No.
1969                                  */
1970                                 goto quit;
1971                         }
1972
1973                         /*
1974                          * Just copy the ASCII string.
1975                          * namelen includes the NUL, so we copy it as
1976                          * well.
1977                          */
1978                         memcpy(Adescptr, tAstr, desclen);
1979                         Adescptr += desclen;
1980                         tAstr += desclen;
1981                         BufferSpaceLeft -= desclen;
1982                 }
1983
1984         quit:
1985                 free(TAdaptersName);
1986                 return (char *)(AdaptersName);
1987         }
1988 }
1989
1990 /*
1991  * We can't use the same code that we use on UN*X, as that's doing
1992  * UN*X-specific calls.
1993  *
1994  * We don't just fetch the entire list of devices, search for the
1995  * particular device, and use its first IPv4 address, as that's too
1996  * much work to get just one device's netmask.
1997  */
1998 int
1999 pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp,
2000     char *errbuf)
2001 {
2002         /*
2003          * We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo()
2004          * in order to skip non IPv4 (i.e. IPv6 addresses)
2005          */
2006         npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
2007         LONG if_addr_size = MAX_NETWORK_ADDRESSES;
2008         struct sockaddr_in *t_addr;
2009         LONG i;
2010
2011         if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) {
2012                 *netp = *maskp = 0;
2013                 return (0);
2014         }
2015
2016         for(i = 0; i < if_addr_size; i++)
2017         {
2018                 if(if_addrs[i].IPAddress.ss_family == AF_INET)
2019                 {
2020                         t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress);
2021                         *netp = t_addr->sin_addr.S_un.S_addr;
2022                         t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask);
2023                         *maskp = t_addr->sin_addr.S_un.S_addr;
2024
2025                         *netp &= *maskp;
2026                         return (0);
2027                 }
2028
2029         }
2030
2031         *netp = *maskp = 0;
2032         return (0);
2033 }
2034
2035 static const char *pcap_lib_version_string;
2036
2037 #ifdef HAVE_VERSION_H
2038 /*
2039  * libpcap being built for Windows, as part of a WinPcap/Npcap source
2040  * tree.  Include version.h from that source tree to get the WinPcap/Npcap
2041  * version.
2042  *
2043  * XXX - it'd be nice if we could somehow generate the WinPcap/Npcap version
2044  * number when building as part of WinPcap/Npcap.  (It'd be nice to do so
2045  * for the packet.dll version number as well.)
2046  */
2047 #include "../../version.h"
2048
2049 static const char pcap_version_string[] =
2050         WINPCAP_PRODUCT_NAME " version " WINPCAP_VER_STRING ", based on " PCAP_VERSION_STRING;
2051
2052 const char *
2053 pcap_lib_version(void)
2054 {
2055         if (pcap_lib_version_string == NULL) {
2056                 /*
2057                  * Generate the version string.
2058                  */
2059                 char *packet_version_string = PacketGetVersion();
2060
2061                 if (strcmp(WINPCAP_VER_STRING, packet_version_string) == 0) {
2062                         /*
2063                          * WinPcap/Npcap version string and packet.dll version
2064                          * string are the same; just report the WinPcap/Npcap
2065                          * version.
2066                          */
2067                         pcap_lib_version_string = pcap_version_string;
2068                 } else {
2069                         /*
2070                          * WinPcap/Npcap version string and packet.dll version
2071                          * string are different; that shouldn't be the
2072                          * case (the two libraries should come from the
2073                          * same version of WinPcap/Npcap), so we report both
2074                          * versions.
2075                          */
2076                         char *full_pcap_version_string;
2077
2078                         if (pcap_asprintf(&full_pcap_version_string,
2079                             WINPCAP_PRODUCT_NAME " version " WINPCAP_VER_STRING " (packet.dll version %s), based on " PCAP_VERSION_STRING,
2080                             packet_version_string) != -1) {
2081                                 /* Success */
2082                                 pcap_lib_version_string = full_pcap_version_string;
2083                         }
2084                 }
2085         }
2086         return (pcap_lib_version_string);
2087 }
2088
2089 #else /* HAVE_VERSION_H */
2090
2091 /*
2092  * libpcap being built for Windows, not as part of a WinPcap/Npcap source
2093  * tree.
2094  */
2095 const char *
2096 pcap_lib_version(void)
2097 {
2098         if (pcap_lib_version_string == NULL) {
2099                 /*
2100                  * Generate the version string.  Report the packet.dll
2101                  * version.
2102                  */
2103                 char *full_pcap_version_string;
2104
2105                 if (pcap_asprintf(&full_pcap_version_string,
2106                     PCAP_VERSION_STRING " (packet.dll version %s)",
2107                     PacketGetVersion()) != -1) {
2108                         /* Success */
2109                         pcap_lib_version_string = full_pcap_version_string;
2110                 }
2111         }
2112         return (pcap_lib_version_string);
2113 }
2114 #endif /* HAVE_VERSION_H */