The Tcpdump Group git mirrors - libpcap/blob - pcap-win32.c

   1 /*
   2  * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
   3  * Copyright (c) 2005 - 2007 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 #ifndef lint
  35 static const char rcsid[] _U_ =
  36     "@(#) $Header: /tcpdump/master/libpcap/pcap-win32.c,v 1.34.2.6 2008-04-14 20:41:52 guy Exp $ (LBL)";
  37 #endif
  38
  39 #include <pcap-int.h>
  40 #include <Packet32.h>
  41 #ifdef __MINGW32__
  42 #include <ddk/ndis.h>
  43 #else /*__MINGW32__*/
  44 #include <ntddndis.h>
  45 #endif /*__MINGW32__*/
  46 #ifdef HAVE_DAG_API
  47 #include <dagnew.h>
  48 #include <dagapi.h>
  49 #endif /* HAVE_DAG_API */
  50 #ifdef __MINGW32__
  51 int* _errno();
  52 #define errno (*_errno())
  53 #endif /* __MINGW32__ */
  54
  55 static int pcap_setfilter_win32_npf(pcap_t *, struct bpf_program *);
  56 static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *);
  57 static int pcap_getnonblock_win32(pcap_t *, char *);
  58 static int pcap_setnonblock_win32(pcap_t *, int, char *);
  59
  60 #define PcapBufSize 256000      /*dimension of the buffer in the pcap_t structure*/
  61 #define SIZE_BUF 1000000
  62
  63 /* Equivalent to ntohs(), but a lot faster under Windows */
  64 #define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
  65
  66 /*
  67  * Header that the WinPcap driver associates to the packets.
  68  * Once was in bpf.h
  69  */
  70 struct bpf_hdr {
  71         struct timeval  bh_tstamp;      /* time stamp */
  72         bpf_u_int32     bh_caplen;      /* length of captured portion */
  73         bpf_u_int32     bh_datalen;     /* original length of packet */
  74         u_short         bh_hdrlen;      /* length of bpf header (this struct
  75                                            plus alignment padding) */
  76 };
  77
  78 /* Start winsock */
  79 int
  80 wsockinit()
  81 {
  82         WORD wVersionRequested;
  83         WSADATA wsaData;
  84         int err;
  85         wVersionRequested = MAKEWORD( 1, 1);
  86         err = WSAStartup( wVersionRequested, &wsaData );
  87         if ( err != 0 )
  88         {
  89                 return -1;
  90         }
  91         return 0;
  92 }
  93
  94
  95 static int
  96 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
  97 {
  98
  99         if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
 100                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
 101                 return -1;
 102         }
 103
 104         return 0;
 105 }
 106
 107 /* Set the dimension of the kernel-level capture buffer */
 108 static int
 109 pcap_setbuff_win32(pcap_t *p, int dim)
 110 {
 111         if(PacketSetBuff(p->adapter,dim)==FALSE)
 112         {
 113                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 114                 return -1;
 115         }
 116         return 0;
 117 }
 118
 119 /* Set the driver working mode */
 120 static int
 121 pcap_setmode_win32(pcap_t *p, int mode)
 122 {
 123         if(PacketSetMode(p->adapter,mode)==FALSE)
 124         {
 125                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 126                 return -1;
 127         }
 128
 129         return 0;
 130 }
 131
 132 /*set the minimum amount of data that will release a read call*/
 133 static int
 134 pcap_setmintocopy_win32(pcap_t *p, int size)
 135 {
 136         if(PacketSetMinToCopy(p->adapter, size)==FALSE)
 137         {
 138                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 139                 return -1;
 140         }
 141         return 0;
 142 }
 143
 144 static int
 145 pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 146 {
 147         int cc;
 148         int n = 0;
 149         register u_char *bp, *ep;
 150
 151         cc = p->cc;
 152         if (p->cc == 0) {
 153                 /*
 154                  * Has "pcap_breakloop()" been called?
 155                  */
 156                 if (p->break_loop) {
 157                         /*
 158                          * Yes - clear the flag that indicates that it
 159                          * has, and return -2 to indicate that we were
 160                          * told to break out of the loop.
 161                          */
 162                         p->break_loop = 0;
 163                         return (-2);
 164                 }
 165
 166             /* capture the packets */
 167                 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
 168                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 169                         return (-1);
 170                 }
 171
 172                 cc = p->Packet->ulBytesReceived;
 173
 174                 bp = p->Packet->Buffer;
 175         }
 176         else
 177                 bp = p->bp;
 178
 179         /*
 180          * Loop through each packet.
 181          */
 182 #define bhp ((struct bpf_hdr *)bp)
 183         ep = bp + cc;
 184         while (1) {
 185                 register int caplen, hdrlen;
 186
 187                 /*
 188                  * Has "pcap_breakloop()" been called?
 189                  * If so, return immediately - if we haven't read any
 190                  * packets, clear the flag and return -2 to indicate
 191                  * that we were told to break out of the loop, otherwise
 192                  * leave the flag set, so that the *next* call will break
 193                  * out of the loop without having read any packets, and
 194                  * return the number of packets we've processed so far.
 195                  */
 196                 if (p->break_loop) {
 197                         if (n == 0) {
 198                                 p->break_loop = 0;
 199                                 return (-2);
 200                         } else {
 201                                 p->bp = bp;
 202                                 p->cc = ep - bp;
 203                                 return (n);
 204                         }
 205                 }
 206                 if (bp >= ep)
 207                         break;
 208
 209                 caplen = bhp->bh_caplen;
 210                 hdrlen = bhp->bh_hdrlen;
 211
 212                 /*
 213                  * XXX A bpf_hdr matches a pcap_pkthdr.
 214                  */
 215                 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
 216                 bp += BPF_WORDALIGN(caplen + hdrlen);
 217                 if (++n >= cnt && cnt > 0) {
 218                         p->bp = bp;
 219                         p->cc = ep - bp;
 220                         return (n);
 221                 }
 222         }
 223 #undef bhp
 224         p->cc = 0;
 225         return (n);
 226 }
 227
 228 #ifdef HAVE_DAG_API
 229 static int
 230 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 231 {
 232         u_char *dp = NULL;
 233         int     packet_len = 0, caplen = 0;
 234         struct pcap_pkthdr      pcap_header;
 235         u_char *endofbuf;
 236         int n = 0;
 237         dag_record_t *header;
 238         unsigned erf_record_len;
 239         ULONGLONG ts;
 240         int cc;
 241         unsigned swt;
 242         unsigned dfp = p->adapter->DagFastProcess;
 243
 244         cc = p->cc;
 245         if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
 246         {
 247             /* Get new packets from the network */
 248                 if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){
 249                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 250                         return (-1);
 251                 }
 252
 253                 cc = p->Packet->ulBytesReceived;
 254                 if(cc == 0)
 255                         /* The timeout has expired but we no packets arrived */
 256                         return 0;
 257                 header = (dag_record_t*)p->adapter->DagBuffer;
 258         }
 259         else
 260                 header = (dag_record_t*)p->bp;
 261
 262         endofbuf = (char*)header + cc;
 263
 264         /*
 265          * Cycle through the packets
 266          */
 267         do
 268         {
 269                 erf_record_len = SWAPS(header->rlen);
 270                 if((char*)header + erf_record_len > endofbuf)
 271                         break;
 272
 273                 /* Increase the number of captured packets */
 274                 p->md.stat.ps_recv++;
 275
 276                 /* Find the beginning of the packet */
 277                 dp = ((u_char *)header) + dag_record_size;
 278
 279                 /* Determine actual packet len */
 280                 switch(header->type)
 281                 {
 282                 case TYPE_ATM:
 283                         packet_len = ATM_SNAPLEN;
 284                         caplen = ATM_SNAPLEN;
 285                         dp += 4;
 286
 287                         break;
 288
 289                 case TYPE_ETH:
 290                         swt = SWAPS(header->wlen);
 291                         packet_len = swt - (p->md.dag_fcs_bits);
 292                         caplen = erf_record_len - dag_record_size - 2;
 293                         if (caplen > packet_len)
 294                         {
 295                                 caplen = packet_len;
 296                         }
 297                         dp += 2;
 298
 299                         break;
 300
 301                 case TYPE_HDLC_POS:
 302                         swt = SWAPS(header->wlen);
 303                         packet_len = swt - (p->md.dag_fcs_bits);
 304                         caplen = erf_record_len - dag_record_size;
 305                         if (caplen > packet_len)
 306                         {
 307                                 caplen = packet_len;
 308                         }
 309
 310                         break;
 311                 }
 312
 313                 if(caplen > p->snapshot)
 314                         caplen = p->snapshot;
 315
 316                 /*
 317                  * Has "pcap_breakloop()" been called?
 318                  * If so, return immediately - if we haven't read any
 319                  * packets, clear the flag and return -2 to indicate
 320                  * that we were told to break out of the loop, otherwise
 321                  * leave the flag set, so that the *next* call will break
 322                  * out of the loop without having read any packets, and
 323                  * return the number of packets we've processed so far.
 324                  */
 325                 if (p->break_loop)
 326                 {
 327                         if (n == 0)
 328                         {
 329                                 p->break_loop = 0;
 330                                 return (-2);
 331                         }
 332                         else
 333                         {
 334                                 p->bp = (char*)header;
 335                                 p->cc = endofbuf - (char*)header;
 336                                 return (n);
 337                         }
 338                 }
 339
 340                 if(!dfp)
 341                 {
 342                         /* convert between timestamp formats */
 343                         ts = header->ts;
 344                         pcap_header.ts.tv_sec = (int)(ts >> 32);
 345                         ts = (ts & 0xffffffffi64) * 1000000;
 346                         ts += 0x80000000; /* rounding */
 347                         pcap_header.ts.tv_usec = (int)(ts >> 32);
 348                         if (pcap_header.ts.tv_usec >= 1000000) {
 349                                 pcap_header.ts.tv_usec -= 1000000;
 350                                 pcap_header.ts.tv_sec++;
 351                         }
 352                 }
 353
 354                 /* No underlaying filtering system. We need to filter on our own */
 355                 if (p->fcode.bf_insns)
 356                 {
 357                         if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
 358                         {
 359                                 /* Move to next packet */
 360                                 header = (dag_record_t*)((char*)header + erf_record_len);
 361                                 continue;
 362                         }
 363                 }
 364
 365                 /* Fill the header for the user suppplied callback function */
 366                 pcap_header.caplen = caplen;
 367                 pcap_header.len = packet_len;
 368
 369                 /* Call the callback function */
 370                 (*callback)(user, &pcap_header, dp);
 371
 372                 /* Move to next packet */
 373                 header = (dag_record_t*)((char*)header + erf_record_len);
 374
 375                 /* Stop if the number of packets requested by user has been reached*/
 376                 if (++n >= cnt && cnt > 0)
 377                 {
 378                         p->bp = (char*)header;
 379                         p->cc = endofbuf - (char*)header;
 380                         return (n);
 381                 }
 382         }
 383         while((u_char*)header < endofbuf);
 384
 385   return 1;
 386 }
 387 #endif /* HAVE_DAG_API */
 388
 389 /* Send a packet to the network */
 390 static int
 391 pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
 392         LPPACKET PacketToSend;
 393
 394         PacketToSend=PacketAllocatePacket();
 395
 396         if (PacketToSend == NULL)
 397         {
 398                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
 399                 return -1;
 400         }
 401
 402         PacketInitPacket(PacketToSend,(PVOID)buf,size);
 403         if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
 404                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
 405                 PacketFreePacket(PacketToSend);
 406                 return -1;
 407         }
 408
 409         PacketFreePacket(PacketToSend);
 410
 411         /*
 412          * We assume it all got sent if "PacketSendPacket()" succeeded.
 413          * "pcap_inject()" is expected to return the number of bytes
 414          * sent.
 415          */
 416         return size;
 417 }
 418
 419 static void
 420 pcap_cleanup_win32(pcap_t *p)
 421 {
 422         if (p->adapter != NULL) {
 423                 PacketCloseAdapter(p->adapter);
 424                 p->adapter = NULL;
 425         }
 426         if (p->Packet) {
 427                 PacketFreePacket(p->Packet);
 428                 p->Packet = NULL;
 429         }
 430         pcap_cleanup_live_common(p);
 431 }
 432
 433 static int
 434 pcap_activate_win32(pcap_t *p)
 435 {
 436         NetType type;
 437
 438         if (p->opt.rfmon) {
 439                 /*
 440                  * No monitor mode on Windows.  It could be done on
 441                  * Vista with drivers that support the native 802.11
 442                  * mechanism and monitor mode.
 443                  */
 444                 return (PCAP_ERROR_RFMON_NOTSUP);
 445         }
 446
 447         /* Init WinSock */
 448         wsockinit();
 449
 450         p->adapter = PacketOpenAdapter(p->opt.source);
 451
 452         if (p->adapter == NULL)
 453         {
 454                 /* Adapter detected but we are not able to open it. Return failure. */
 455                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
 456                 return PCAP_ERROR;
 457         }
 458
 459         /*get network type*/
 460         if(PacketGetNetType (p->adapter,&type) == FALSE)
 461         {
 462                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
 463                 goto bad;
 464         }
 465
 466         /*Set the linktype*/
 467         switch (type.LinkType)
 468         {
 469         case NdisMediumWan:
 470                 p->linktype = DLT_EN10MB;
 471                 break;
 472
 473         case NdisMedium802_3:
 474                 p->linktype = DLT_EN10MB;
 475                 /*
 476                  * This is (presumably) a real Ethernet capture; give it a
 477                  * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
 478                  * that an application can let you choose it, in case you're
 479                  * capturing DOCSIS traffic that a Cisco Cable Modem
 480                  * Termination System is putting out onto an Ethernet (it
 481                  * doesn't put an Ethernet header onto the wire, it puts raw
 482                  * DOCSIS frames out on the wire inside the low-level
 483                  * Ethernet framing).
 484                  */
 485                 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
 486                 /*
 487                  * If that fails, just leave the list empty.
 488                  */
 489                 if (p->dlt_list != NULL) {
 490                         p->dlt_list[0] = DLT_EN10MB;
 491                         p->dlt_list[1] = DLT_DOCSIS;
 492                         p->dlt_count = 2;
 493                 }
 494                 break;
 495
 496         case NdisMediumFddi:
 497                 p->linktype = DLT_FDDI;
 498                 break;
 499
 500         case NdisMedium802_5:
 501                 p->linktype = DLT_IEEE802;
 502                 break;
 503
 504         case NdisMediumArcnetRaw:
 505                 p->linktype = DLT_ARCNET;
 506                 break;
 507
 508         case NdisMediumArcnet878_2:
 509                 p->linktype = DLT_ARCNET;
 510                 break;
 511
 512         case NdisMediumAtm:
 513                 p->linktype = DLT_ATM_RFC1483;
 514                 break;
 515
 516         case NdisMediumCHDLC:
 517                 p->linktype = DLT_CHDLC;
 518                 break;
 519
 520         case NdisMediumPPPSerial:
 521                 p->linktype = DLT_PPP_SERIAL;
 522                 break;
 523
 524         case NdisMediumNull:
 525                 p->linktype = DLT_NULL;
 526                 break;
 527
 528         case NdisMediumBare80211:
 529                 p->linktype = DLT_IEEE802_11;
 530                 break;
 531
 532         case NdisMediumRadio80211:
 533                 p->linktype = DLT_IEEE802_11_RADIO;
 534                 break;
 535
 536         case NdisMediumPpi:
 537                 p->linktype = DLT_PPI;
 538                 break;
 539
 540         default:
 541                 p->linktype = DLT_EN10MB;                       /*an unknown adapter is assumed to be ethernet*/
 542                 break;
 543         }
 544
 545         /* Set promiscuous mode */
 546         if (p->opt.promisc)
 547         {
 548
 549                 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
 550                 {
 551                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
 552                         goto bad;
 553                 }
 554         }
 555         else
 556         {
 557                 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE)
 558                 {
 559                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
 560                         goto bad;
 561                 }
 562         }
 563
 564         /* Set the buffer size */
 565         p->bufsize = PcapBufSize;
 566
 567         /* allocate Packet structure used during the capture */
 568         if((p->Packet = PacketAllocatePacket())==NULL)
 569         {
 570                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
 571                 goto bad;
 572         }
 573
 574         if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
 575         {
 576         /*
 577          * Traditional Adapter
 578          */
 579                 /*
 580                  * If the buffer size wasn't explicitly set, default to
 581                  * SIZE_BUF.
 582                  */
 583                 if (p->opt.buffer_size == 0)
 584                         p->opt.buffer_size = SIZE_BUF;
 585                 if(PacketSetBuff(p->adapter,p->opt.buffer_size)==FALSE)
 586                 {
 587                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 588                         goto bad;
 589                 }
 590
 591                 p->buffer = (u_char *)malloc(PcapBufSize);
 592                 if (p->buffer == NULL)
 593                 {
 594                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 595                         goto bad;
 596                 }
 597
 598                 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
 599
 600                 /* allocate the standard buffer in the driver */
 601                 if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
 602                 {
 603                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
 604                         goto bad;
 605                 }
 606
 607                 /* tell the driver to copy the buffer only if it contains at least 16K */
 608                 if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
 609                 {
 610                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
 611                         goto bad;
 612                 }
 613         }
 614         else
 615 #ifdef HAVE_DAG_API
 616         {
 617         /*
 618          * Dag Card
 619          */
 620                 LONG    status;
 621                 HKEY    dagkey;
 622                 DWORD   lptype;
 623                 DWORD   lpcbdata;
 624                 int             postype = 0;
 625                 char    keyname[512];
 626
 627                 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
 628                         "SYSTEM\\CurrentControlSet\\Services\\DAG",
 629                         strstr(_strlwr(p->opt.source), "dag"));
 630                 do
 631                 {
 632                         status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
 633                         if(status != ERROR_SUCCESS)
 634                                 break;
 635
 636                         status = RegQueryValueEx(dagkey,
 637                                 "PosType",
 638                                 NULL,
 639                                 &lptype,
 640                                 (char*)&postype,
 641                                 &lpcbdata);
 642
 643                         if(status != ERROR_SUCCESS)
 644                         {
 645                                 postype = 0;
 646                         }
 647
 648                         RegCloseKey(dagkey);
 649                 }
 650                 while(FALSE);
 651
 652
 653                 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
 654
 655                 /* Set the length of the FCS associated to any packet. This value
 656                  * will be subtracted to the packet length */
 657                 p->md.dag_fcs_bits = p->adapter->DagFcsLen;
 658         }
 659 #else
 660         goto bad;
 661 #endif /* HAVE_DAG_API */
 662
 663         PacketSetReadTimeout(p->adapter, p->md.timeout);
 664
 665 #ifdef HAVE_DAG_API
 666         if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
 667         {
 668                 /* install dag specific handlers for read and setfilter */
 669                 p->read_op = pcap_read_win32_dag;
 670                 p->setfilter_op = pcap_setfilter_win32_dag;
 671         }
 672         else
 673         {
 674 #endif /* HAVE_DAG_API */
 675                 /* install traditional npf handlers for read and setfilter */
 676                 p->read_op = pcap_read_win32_npf;
 677                 p->setfilter_op = pcap_setfilter_win32_npf;
 678 #ifdef HAVE_DAG_API
 679         }
 680 #endif /* HAVE_DAG_API */
 681         p->setdirection_op = NULL;      /* Not implemented. */
 682             /* XXX - can this be implemented on some versions of Windows? */
 683         p->inject_op = pcap_inject_win32;
 684         p->set_datalink_op = NULL;      /* can't change data link type */
 685         p->getnonblock_op = pcap_getnonblock_win32;
 686         p->setnonblock_op = pcap_setnonblock_win32;
 687         p->stats_op = pcap_stats_win32;
 688         p->setbuff_op = pcap_setbuff_win32;
 689         p->setmode_op = pcap_setmode_win32;
 690         p->setmintocopy_op = pcap_setmintocopy_win32;
 691         p->cleanup_op = pcap_cleanup_win32;
 692
 693         return (0);
 694 bad:
 695         pcap_cleanup_win32(p);
 696         return (PCAP_ERROR);
 697 }
 698
 699 pcap_t *
 700 pcap_create(const char *device, char *ebuf)
 701 {
 702         pcap_t *p;
 703
 704         p = pcap_create_common(device, ebuf);
 705         if (p == NULL)
 706                 return (NULL);
 707
 708         p->activate_op = pcap_activate_win32;
 709         return (p);
 710 }
 711
 712 static int
 713 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
 714 {
 715         if(PacketSetBpf(p->adapter,fp)==FALSE){
 716                 /*
 717                  * Kernel filter not installed.
 718                  * XXX - fall back on userland filtering, as is done
 719                  * on other platforms?
 720                  */
 721                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
 722                 return (-1);
 723         }
 724
 725         /*
 726          * Discard any previously-received packets, as they might have
 727          * passed whatever filter was formerly in effect, but might
 728          * not pass this filter (BIOCSETF discards packets buffered
 729          * in the kernel, so you can lose packets in any case).
 730          */
 731         p->cc = 0;
 732         return (0);
 733 }
 734
 735 /*
 736  * We filter at user level, since the kernel driver does't process the packets
 737  */
 738 static int
 739 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
 740
 741         if(!fp)
 742         {
 743                 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
 744                 return -1;
 745         }
 746
 747         /* Install a user level filter */
 748         if (install_bpf_program(p, fp) < 0)
 749         {
 750                 snprintf(p->errbuf, sizeof(p->errbuf),
 751                         "setfilter, unable to install the filter: %s", pcap_strerror(errno));
 752                 return -1;
 753         }
 754
 755         p->md.use_bpf = 0;
 756
 757         return (0);
 758 }
 759
 760 static int
 761 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
 762 {
 763         /*
 764          * XXX - if there were a PacketGetReadTimeout() call, we
 765          * would use it, and return 1 if the timeout is -1
 766          * and 0 otherwise.
 767          */
 768         return (p->nonblock);
 769 }
 770
 771 static int
 772 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
 773 {
 774         int newtimeout;
 775
 776         if (nonblock) {
 777                 /*
 778                  * Set the read timeout to -1 for non-blocking mode.
 779                  */
 780                 newtimeout = -1;
 781         } else {
 782                 /*
 783                  * Restore the timeout set when the device was opened.
 784                  * (Note that this may be -1, in which case we're not
 785                  * really leaving non-blocking mode.)
 786                  */
 787                 newtimeout = p->md.timeout;
 788         }
 789         if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
 790                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 791                     "PacketSetReadTimeout: %s", pcap_win32strerror());
 792                 return (-1);
 793         }
 794         p->nonblock = (newtimeout == -1);
 795         return (0);
 796 }
 797
 798 /*platform-dependent routine to add devices other than NDIS interfaces*/
 799 int
 800 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
 801 {
 802         return (0);
 803 }