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 - 2008 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 #include <pcap-int.h>
  35 #include <Packet32.h>
  36 #ifdef __MINGW32__
  37 #ifdef __MINGW64__
  38 #include <ntddndis.h>
  39 #else  /*__MINGW64__*/
  40 #include <ddk/ntddndis.h>
  41 #include <ddk/ndis.h>
  42 #endif /*__MINGW64__*/
  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 /*dimension of the buffer in the pcap_t structure*/
  61 #define WIN32_DEFAULT_USER_BUFFER_SIZE 256000
  62
  63 /*dimension of the buffer in the kernel driver NPF */
  64 #define WIN32_DEFAULT_KERNEL_BUFFER_SIZE 1000000
  65
  66 /* Equivalent to ntohs(), but a lot faster under Windows */
  67 #define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
  68
  69 /*
  70  * Private data for capturing on WinPcap devices.
  71  */
  72 struct pcap_win {
  73         int nonblock;
  74
  75 #ifdef HAVE_DAG_API
  76         int     dag_fcs_bits;   /* Number of checksum bits from link layer */
  77 #endif
  78 };
  79
  80 /*
  81  * Header that the WinPcap driver associates to the packets.
  82  * Once was in bpf.h
  83  */
  84 struct bpf_hdr {
  85         struct timeval  bh_tstamp;      /* time stamp */
  86         bpf_u_int32     bh_caplen;      /* length of captured portion */
  87         bpf_u_int32     bh_datalen;     /* original length of packet */
  88         u_short         bh_hdrlen;      /* length of bpf header (this struct
  89                                            plus alignment padding) */
  90 };
  91
  92 CRITICAL_SECTION g_PcapCompileCriticalSection;
  93
  94 BOOL WINAPI DllMain(
  95   HANDLE hinstDLL,
  96   DWORD dwReason,
  97   LPVOID lpvReserved
  98 )
  99 {
 100         if (dwReason == DLL_PROCESS_ATTACH)
 101         {
 102                 InitializeCriticalSection(&g_PcapCompileCriticalSection);
 103         }
 104
 105         return TRUE;
 106 }
 107
 108 /* Start winsock */
 109 int
 110 wsockinit()
 111 {
 112         WORD wVersionRequested;
 113         WSADATA wsaData;
 114         int err;
 115         wVersionRequested = MAKEWORD( 1, 1);
 116         err = WSAStartup( wVersionRequested, &wsaData );
 117         if ( err != 0 )
 118         {
 119                 return -1;
 120         }
 121         return 0;
 122 }
 123
 124
 125 static int
 126 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
 127 {
 128
 129         if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
 130                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
 131                 return -1;
 132         }
 133
 134         return 0;
 135 }
 136
 137 /* Set the dimension of the kernel-level capture buffer */
 138 static int
 139 pcap_setbuff_win32(pcap_t *p, int dim)
 140 {
 141         if(PacketSetBuff(p->adapter,dim)==FALSE)
 142         {
 143                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 144                 return -1;
 145         }
 146         return 0;
 147 }
 148
 149 /* Set the driver working mode */
 150 static int
 151 pcap_setmode_win32(pcap_t *p, int mode)
 152 {
 153         if(PacketSetMode(p->adapter,mode)==FALSE)
 154         {
 155                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 156                 return -1;
 157         }
 158
 159         return 0;
 160 }
 161
 162 /*set the minimum amount of data that will release a read call*/
 163 static int
 164 pcap_setmintocopy_win32(pcap_t *p, int size)
 165 {
 166         if(PacketSetMinToCopy(p->adapter, size)==FALSE)
 167         {
 168                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 169                 return -1;
 170         }
 171         return 0;
 172 }
 173
 174 /*return the Adapter for a pcap_t*/
 175 static Adapter *
 176 pcap_getadapter_win32(pcap_t *p)
 177 {
 178         return p->adapter;
 179 }
 180
 181 static int
 182 pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 183 {
 184         int cc;
 185         int n = 0;
 186         register u_char *bp, *ep;
 187
 188         cc = p->cc;
 189         if (p->cc == 0) {
 190                 /*
 191                  * Has "pcap_breakloop()" been called?
 192                  */
 193                 if (p->break_loop) {
 194                         /*
 195                          * Yes - clear the flag that indicates that it
 196                          * has, and return -2 to indicate that we were
 197                          * told to break out of the loop.
 198                          */
 199                         p->break_loop = 0;
 200                         return (-2);
 201                 }
 202
 203             /* capture the packets */
 204                 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
 205                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 206                         return (-1);
 207                 }
 208
 209                 cc = p->Packet->ulBytesReceived;
 210
 211                 bp = p->Packet->Buffer;
 212         }
 213         else
 214                 bp = p->bp;
 215
 216         /*
 217          * Loop through each packet.
 218          */
 219 #define bhp ((struct bpf_hdr *)bp)
 220         ep = bp + cc;
 221         while (1) {
 222                 register int caplen, hdrlen;
 223
 224                 /*
 225                  * Has "pcap_breakloop()" been called?
 226                  * If so, return immediately - if we haven't read any
 227                  * packets, clear the flag and return -2 to indicate
 228                  * that we were told to break out of the loop, otherwise
 229                  * leave the flag set, so that the *next* call will break
 230                  * out of the loop without having read any packets, and
 231                  * return the number of packets we've processed so far.
 232                  */
 233                 if (p->break_loop) {
 234                         if (n == 0) {
 235                                 p->break_loop = 0;
 236                                 return (-2);
 237                         } else {
 238                                 p->bp = bp;
 239                                 p->cc = ep - bp;
 240                                 return (n);
 241                         }
 242                 }
 243                 if (bp >= ep)
 244                         break;
 245
 246                 caplen = bhp->bh_caplen;
 247                 hdrlen = bhp->bh_hdrlen;
 248
 249                 /*
 250                  * XXX A bpf_hdr matches a pcap_pkthdr.
 251                  */
 252                 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
 253                 bp += Packet_WORDALIGN(caplen + hdrlen);
 254                 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
 255                         p->bp = bp;
 256                         p->cc = ep - bp;
 257                         return (n);
 258                 }
 259         }
 260 #undef bhp
 261         p->cc = 0;
 262         return (n);
 263 }
 264
 265 #ifdef HAVE_DAG_API
 266 static int
 267 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 268 {
 269         struct pcap_win *pw = p->priv;
 270         u_char *dp = NULL;
 271         int     packet_len = 0, caplen = 0;
 272         struct pcap_pkthdr      pcap_header;
 273         u_char *endofbuf;
 274         int n = 0;
 275         dag_record_t *header;
 276         unsigned erf_record_len;
 277         ULONGLONG ts;
 278         int cc;
 279         unsigned swt;
 280         unsigned dfp = p->adapter->DagFastProcess;
 281
 282         cc = p->cc;
 283         if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
 284         {
 285             /* Get new packets from the network */
 286                 if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){
 287                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 288                         return (-1);
 289                 }
 290
 291                 cc = p->Packet->ulBytesReceived;
 292                 if(cc == 0)
 293                         /* The timeout has expired but we no packets arrived */
 294                         return 0;
 295                 header = (dag_record_t*)p->adapter->DagBuffer;
 296         }
 297         else
 298                 header = (dag_record_t*)p->bp;
 299
 300         endofbuf = (char*)header + cc;
 301
 302         /*
 303          * Cycle through the packets
 304          */
 305         do
 306         {
 307                 erf_record_len = SWAPS(header->rlen);
 308                 if((char*)header + erf_record_len > endofbuf)
 309                         break;
 310
 311                 /* Increase the number of captured packets */
 312                 pw->stat.ps_recv++;
 313
 314                 /* Find the beginning of the packet */
 315                 dp = ((u_char *)header) + dag_record_size;
 316
 317                 /* Determine actual packet len */
 318                 switch(header->type)
 319                 {
 320                 case TYPE_ATM:
 321                         packet_len = ATM_SNAPLEN;
 322                         caplen = ATM_SNAPLEN;
 323                         dp += 4;
 324
 325                         break;
 326
 327                 case TYPE_ETH:
 328                         swt = SWAPS(header->wlen);
 329                         packet_len = swt - (pw->dag_fcs_bits);
 330                         caplen = erf_record_len - dag_record_size - 2;
 331                         if (caplen > packet_len)
 332                         {
 333                                 caplen = packet_len;
 334                         }
 335                         dp += 2;
 336
 337                         break;
 338
 339                 case TYPE_HDLC_POS:
 340                         swt = SWAPS(header->wlen);
 341                         packet_len = swt - (pw->dag_fcs_bits);
 342                         caplen = erf_record_len - dag_record_size;
 343                         if (caplen > packet_len)
 344                         {
 345                                 caplen = packet_len;
 346                         }
 347
 348                         break;
 349                 }
 350
 351                 if(caplen > p->snapshot)
 352                         caplen = p->snapshot;
 353
 354                 /*
 355                  * Has "pcap_breakloop()" been called?
 356                  * If so, return immediately - if we haven't read any
 357                  * packets, clear the flag and return -2 to indicate
 358                  * that we were told to break out of the loop, otherwise
 359                  * leave the flag set, so that the *next* call will break
 360                  * out of the loop without having read any packets, and
 361                  * return the number of packets we've processed so far.
 362                  */
 363                 if (p->break_loop)
 364                 {
 365                         if (n == 0)
 366                         {
 367                                 p->break_loop = 0;
 368                                 return (-2);
 369                         }
 370                         else
 371                         {
 372                                 p->bp = (char*)header;
 373                                 p->cc = endofbuf - (char*)header;
 374                                 return (n);
 375                         }
 376                 }
 377
 378                 if(!dfp)
 379                 {
 380                         /* convert between timestamp formats */
 381                         ts = header->ts;
 382                         pcap_header.ts.tv_sec = (int)(ts >> 32);
 383                         ts = (ts & 0xffffffffi64) * 1000000;
 384                         ts += 0x80000000; /* rounding */
 385                         pcap_header.ts.tv_usec = (int)(ts >> 32);
 386                         if (pcap_header.ts.tv_usec >= 1000000) {
 387                                 pcap_header.ts.tv_usec -= 1000000;
 388                                 pcap_header.ts.tv_sec++;
 389                         }
 390                 }
 391
 392                 /* No underlaying filtering system. We need to filter on our own */
 393                 if (p->fcode.bf_insns)
 394                 {
 395                         if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
 396                         {
 397                                 /* Move to next packet */
 398                                 header = (dag_record_t*)((char*)header + erf_record_len);
 399                                 continue;
 400                         }
 401                 }
 402
 403                 /* Fill the header for the user suppplied callback function */
 404                 pcap_header.caplen = caplen;
 405                 pcap_header.len = packet_len;
 406
 407                 /* Call the callback function */
 408                 (*callback)(user, &pcap_header, dp);
 409
 410                 /* Move to next packet */
 411                 header = (dag_record_t*)((char*)header + erf_record_len);
 412
 413                 /* Stop if the number of packets requested by user has been reached*/
 414                 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
 415                 {
 416                         p->bp = (char*)header;
 417                         p->cc = endofbuf - (char*)header;
 418                         return (n);
 419                 }
 420         }
 421         while((u_char*)header < endofbuf);
 422
 423   return 1;
 424 }
 425 #endif /* HAVE_DAG_API */
 426
 427 /* Send a packet to the network */
 428 static int
 429 pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
 430         LPPACKET PacketToSend;
 431
 432         PacketToSend=PacketAllocatePacket();
 433
 434         if (PacketToSend == NULL)
 435         {
 436                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
 437                 return -1;
 438         }
 439
 440         PacketInitPacket(PacketToSend,(PVOID)buf,size);
 441         if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
 442                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
 443                 PacketFreePacket(PacketToSend);
 444                 return -1;
 445         }
 446
 447         PacketFreePacket(PacketToSend);
 448
 449         /*
 450          * We assume it all got sent if "PacketSendPacket()" succeeded.
 451          * "pcap_inject()" is expected to return the number of bytes
 452          * sent.
 453          */
 454         return size;
 455 }
 456
 457 static void
 458 pcap_cleanup_win32(pcap_t *p)
 459 {
 460         if (p->adapter != NULL) {
 461                 PacketCloseAdapter(p->adapter);
 462                 p->adapter = NULL;
 463         }
 464         if (p->Packet) {
 465                 PacketFreePacket(p->Packet);
 466                 p->Packet = NULL;
 467         }
 468         pcap_cleanup_live_common(p);
 469 }
 470
 471 static int
 472 pcap_activate_win32(pcap_t *p)
 473 {
 474         struct pcap_win *pw = p->priv;
 475         NetType type;
 476
 477         if (p->opt.rfmon) {
 478                 /*
 479                  * No monitor mode on Windows.  It could be done on
 480                  * Vista with drivers that support the native 802.11
 481                  * mechanism and monitor mode.
 482                  */
 483                 return (PCAP_ERROR_RFMON_NOTSUP);
 484         }
 485
 486         /* Init WinSock */
 487         wsockinit();
 488
 489         p->adapter = PacketOpenAdapter(p->opt.source);
 490
 491         if (p->adapter == NULL)
 492         {
 493                 /* Adapter detected but we are not able to open it. Return failure. */
 494                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
 495                 return PCAP_ERROR;
 496         }
 497
 498         /*get network type*/
 499         if(PacketGetNetType (p->adapter,&type) == FALSE)
 500         {
 501                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
 502                 goto bad;
 503         }
 504
 505         /*Set the linktype*/
 506         switch (type.LinkType)
 507         {
 508         case NdisMediumWan:
 509                 p->linktype = DLT_EN10MB;
 510                 break;
 511
 512         case NdisMedium802_3:
 513                 p->linktype = DLT_EN10MB;
 514                 /*
 515                  * This is (presumably) a real Ethernet capture; give it a
 516                  * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
 517                  * that an application can let you choose it, in case you're
 518                  * capturing DOCSIS traffic that a Cisco Cable Modem
 519                  * Termination System is putting out onto an Ethernet (it
 520                  * doesn't put an Ethernet header onto the wire, it puts raw
 521                  * DOCSIS frames out on the wire inside the low-level
 522                  * Ethernet framing).
 523                  */
 524                 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
 525                 /*
 526                  * If that fails, just leave the list empty.
 527                  */
 528                 if (p->dlt_list != NULL) {
 529                         p->dlt_list[0] = DLT_EN10MB;
 530                         p->dlt_list[1] = DLT_DOCSIS;
 531                         p->dlt_count = 2;
 532                 }
 533                 break;
 534
 535         case NdisMediumFddi:
 536                 p->linktype = DLT_FDDI;
 537                 break;
 538
 539         case NdisMedium802_5:
 540                 p->linktype = DLT_IEEE802;
 541                 break;
 542
 543         case NdisMediumArcnetRaw:
 544                 p->linktype = DLT_ARCNET;
 545                 break;
 546
 547         case NdisMediumArcnet878_2:
 548                 p->linktype = DLT_ARCNET;
 549                 break;
 550
 551         case NdisMediumAtm:
 552                 p->linktype = DLT_ATM_RFC1483;
 553                 break;
 554
 555         case NdisMediumCHDLC:
 556                 p->linktype = DLT_CHDLC;
 557                 break;
 558
 559         case NdisMediumPPPSerial:
 560                 p->linktype = DLT_PPP_SERIAL;
 561                 break;
 562
 563         case NdisMediumNull:
 564                 p->linktype = DLT_NULL;
 565                 break;
 566
 567         case NdisMediumBare80211:
 568                 p->linktype = DLT_IEEE802_11;
 569                 break;
 570
 571         case NdisMediumRadio80211:
 572                 p->linktype = DLT_IEEE802_11_RADIO;
 573                 break;
 574
 575         case NdisMediumPpi:
 576                 p->linktype = DLT_PPI;
 577                 break;
 578
 579         default:
 580                 p->linktype = DLT_EN10MB;                       /*an unknown adapter is assumed to be ethernet*/
 581                 break;
 582         }
 583
 584         /* Set promiscuous mode */
 585         if (p->opt.promisc)
 586         {
 587
 588                 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
 589                 {
 590                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
 591                         goto bad;
 592                 }
 593         }
 594         else
 595         {
 596                 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE)
 597                 {
 598                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
 599                         goto bad;
 600                 }
 601         }
 602
 603         /* Set the buffer size */
 604         p->bufsize = WIN32_DEFAULT_USER_BUFFER_SIZE;
 605
 606         /* allocate Packet structure used during the capture */
 607         if((p->Packet = PacketAllocatePacket())==NULL)
 608         {
 609                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
 610                 goto bad;
 611         }
 612
 613         if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
 614         {
 615         /*
 616          * Traditional Adapter
 617          */
 618                 /*
 619                  * If the buffer size wasn't explicitly set, default to
 620                  * WIN32_DEFAULT_USER_BUFFER_SIZE.
 621                  */
 622                 if (p->opt.buffer_size == 0)
 623                         p->opt.buffer_size = WIN32_DEFAULT_KERNEL_BUFFER_SIZE;
 624
 625                 if(PacketSetBuff(p->adapter,p->opt.buffer_size)==FALSE)
 626                 {
 627                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 628                         goto bad;
 629                 }
 630
 631                 p->buffer = (u_char *)malloc(p->bufsize);
 632                 if (p->buffer == NULL)
 633                 {
 634                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 635                         goto bad;
 636                 }
 637
 638                 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
 639
 640                 if (p-opt.immediate)
 641                 {
 642                         /* tell the driver to copy the buffer as soon as data arrives */
 643                         if(PacketSetMinToCopy(p->adapter,0)==FALSE)
 644                         {
 645                                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror());
 646                                 goto bad;
 647                         }
 648                 }
 649                 else
 650                 {
 651                         /* tell the driver to copy the buffer only if it contains at least 16K */
 652                         if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
 653                         {
 654                                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror());
 655                                 goto bad;
 656                         }
 657                 }
 658         }
 659         else
 660 #ifdef HAVE_DAG_API
 661         {
 662         /*
 663          * Dag Card
 664          */
 665                 LONG    status;
 666                 HKEY    dagkey;
 667                 DWORD   lptype;
 668                 DWORD   lpcbdata;
 669                 int             postype = 0;
 670                 char    keyname[512];
 671
 672                 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
 673                         "SYSTEM\\CurrentControlSet\\Services\\DAG",
 674                         strstr(_strlwr(p->opt.source), "dag"));
 675                 do
 676                 {
 677                         status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
 678                         if(status != ERROR_SUCCESS)
 679                                 break;
 680
 681                         status = RegQueryValueEx(dagkey,
 682                                 "PosType",
 683                                 NULL,
 684                                 &lptype,
 685                                 (char*)&postype,
 686                                 &lpcbdata);
 687
 688                         if(status != ERROR_SUCCESS)
 689                         {
 690                                 postype = 0;
 691                         }
 692
 693                         RegCloseKey(dagkey);
 694                 }
 695                 while(FALSE);
 696
 697
 698                 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
 699
 700                 /* Set the length of the FCS associated to any packet. This value
 701                  * will be subtracted to the packet length */
 702                 pw->dag_fcs_bits = p->adapter->DagFcsLen;
 703         }
 704 #else
 705         goto bad;
 706 #endif /* HAVE_DAG_API */
 707
 708         PacketSetReadTimeout(p->adapter, p->opt.timeout);
 709
 710 #ifdef HAVE_DAG_API
 711         if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
 712         {
 713                 /* install dag specific handlers for read and setfilter */
 714                 p->read_op = pcap_read_win32_dag;
 715                 p->setfilter_op = pcap_setfilter_win32_dag;
 716         }
 717         else
 718         {
 719 #endif /* HAVE_DAG_API */
 720                 /* install traditional npf handlers for read and setfilter */
 721                 p->read_op = pcap_read_win32_npf;
 722                 p->setfilter_op = pcap_setfilter_win32_npf;
 723 #ifdef HAVE_DAG_API
 724         }
 725 #endif /* HAVE_DAG_API */
 726         p->setdirection_op = NULL;      /* Not implemented. */
 727             /* XXX - can this be implemented on some versions of Windows? */
 728         p->inject_op = pcap_inject_win32;
 729         p->set_datalink_op = NULL;      /* can't change data link type */
 730         p->getnonblock_op = pcap_getnonblock_win32;
 731         p->setnonblock_op = pcap_setnonblock_win32;
 732         p->stats_op = pcap_stats_win32;
 733         p->setbuff_op = pcap_setbuff_win32;
 734         p->setmode_op = pcap_setmode_win32;
 735         p->setmintocopy_op = pcap_setmintocopy_win32;
 736         p->getadapter_op = pcap_getadapter_win32;
 737         p->cleanup_op = pcap_cleanup_win32;
 738
 739         return (0);
 740 bad:
 741         pcap_cleanup_win32(p);
 742         return (PCAP_ERROR);
 743 }
 744
 745 pcap_t *
 746 pcap_create_interface(const char *device, char *ebuf)
 747 {
 748         pcap_t *p;
 749
 750         if (strlen(device) == 1)
 751         {
 752                 /*
 753                  * It's probably a unicode string
 754                  * Convert to ascii and pass it to pcap_create_common
 755                  *
 756                  * This wonderful hack is needed because pcap_lookupdev still returns
 757                  * unicode strings, and it's used by windump when no device is specified
 758                  * in the command line
 759                  */
 760                 size_t length;
 761                 char* deviceAscii;
 762
 763                 length = wcslen((wchar_t*)device);
 764
 765                 deviceAscii = (char*)malloc(length + 1);
 766
 767                 if (deviceAscii == NULL)
 768                 {
 769                         snprintf(ebuf, PCAP_ERRBUF_SIZE, "Malloc failed");
 770                         return NULL;
 771                 }
 772
 773                 snprintf(deviceAscii, length + 1, "%ws", (wchar_t*)device);
 774                 p = pcap_create_common(deviceAscii, ebuf, sizeof (struct pcap_win));
 775                 free(deviceAscii);
 776         }
 777         else
 778         {
 779                 p = pcap_create_common(device, ebuf, sizeof (struct pcap_win));
 780         }
 781
 782         if (p == NULL)
 783                 return (NULL);
 784
 785         p->activate_op = pcap_activate_win32;
 786         return (p);
 787 }
 788
 789 static int
 790 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
 791 {
 792         if(PacketSetBpf(p->adapter,fp)==FALSE){
 793                 /*
 794                  * Kernel filter not installed.
 795                  * XXX - fall back on userland filtering, as is done
 796                  * on other platforms?
 797                  */
 798                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
 799                 return (-1);
 800         }
 801
 802         /*
 803          * Discard any previously-received packets, as they might have
 804          * passed whatever filter was formerly in effect, but might
 805          * not pass this filter (BIOCSETF discards packets buffered
 806          * in the kernel, so you can lose packets in any case).
 807          */
 808         p->cc = 0;
 809         return (0);
 810 }
 811
 812 /*
 813  * We filter at user level, since the kernel driver does't process the packets
 814  */
 815 static int
 816 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
 817
 818         if(!fp)
 819         {
 820                 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
 821                 return -1;
 822         }
 823
 824         /* Install a user level filter */
 825         if (install_bpf_program(p, fp) < 0)
 826         {
 827                 snprintf(p->errbuf, sizeof(p->errbuf),
 828                         "setfilter, unable to install the filter: %s", pcap_strerror(errno));
 829                 return -1;
 830         }
 831
 832         return (0);
 833 }
 834
 835 static int
 836 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
 837 {
 838         struct pcap_win *pw = p->priv;
 839
 840         /*
 841          * XXX - if there were a PacketGetReadTimeout() call, we
 842          * would use it, and return 1 if the timeout is -1
 843          * and 0 otherwise.
 844          */
 845         return (pw->nonblock);
 846 }
 847
 848 static int
 849 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
 850 {
 851         struct pcap_win *pw = p->priv;
 852         int newtimeout;
 853
 854         if (nonblock) {
 855                 /*
 856                  * Set the read timeout to -1 for non-blocking mode.
 857                  */
 858                 newtimeout = -1;
 859         } else {
 860                 /*
 861                  * Restore the timeout set when the device was opened.
 862                  * (Note that this may be -1, in which case we're not
 863                  * really leaving non-blocking mode.)
 864                  */
 865                 newtimeout = p->opt.timeout;
 866         }
 867         if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
 868                 snprintf(errbuf, PCAP_ERRBUF_SIZE,
 869                     "PacketSetReadTimeout: %s", pcap_win32strerror());
 870                 return (-1);
 871         }
 872         pw->nonblock = (newtimeout == -1);
 873         return (0);
 874 }
 875
 876 /*platform-dependent routine to add devices other than NDIS interfaces*/
 877 int
 878 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
 879 {
 880         return (0);
 881 }