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

   1 /*
   2  * Copyright (c) 1999 - 2003
   3  * NetGroup, Politecnico di Torino (Italy)
   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 nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  */
  32
  33 #ifndef lint
  34 static const char rcsid[] _U_ =
  35     "@(#) $Header: /tcpdump/master/libpcap/pcap-win32.c,v 1.25 2005-02-26 21:58:06 guy Exp $ (LBL)";
  36 #endif
  37
  38 #include <pcap-int.h>
  39 #include <packet32.h>
  40 #include <Ntddndis.h>
  41 #ifdef HAVE_DAG_API
  42 #include <dagnew.h>
  43 #include <dagapi.h>
  44 #endif /* HAVE_DAG_API */
  45 #ifdef __MINGW32__
  46 int* _errno();
  47 #define errno (*_errno())
  48 #endif /* __MINGW32__ */
  49
  50 static int pcap_setfilter_win32_npf(pcap_t *, struct bpf_program *);
  51 static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *);
  52 static int pcap_getnonblock_win32(pcap_t *, char *);
  53 static int pcap_setnonblock_win32(pcap_t *, int, char *);
  54
  55 #define PcapBufSize 256000      /*dimension of the buffer in the pcap_t structure*/
  56 #define SIZE_BUF 1000000
  57
  58 /* Equivalent to ntohs(), but a lot faster under Windows */
  59 #define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
  60
  61 /*
  62  * Header that the WinPcap driver associates to the packets.
  63  * Once was in bpf.h
  64  */
  65 struct bpf_hdr {
  66         struct timeval  bh_tstamp;      /* time stamp */
  67         bpf_u_int32     bh_caplen;      /* length of captured portion */
  68         bpf_u_int32     bh_datalen;     /* original length of packet */
  69         u_short         bh_hdrlen;      /* length of bpf header (this struct
  70                                            plus alignment padding) */
  71 };
  72
  73 /* Start winsock */
  74 int
  75 wsockinit()
  76 {
  77         WORD wVersionRequested;
  78         WSADATA wsaData;
  79         int err;
  80         wVersionRequested = MAKEWORD( 1, 1);
  81         err = WSAStartup( wVersionRequested, &wsaData );
  82         if ( err != 0 )
  83         {
  84                 return -1;
  85         }
  86         return 0;
  87 }
  88
  89
  90 static int
  91 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
  92 {
  93
  94         if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
  95                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
  96                 return -1;
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int
 103 pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 104 {
 105         int cc;
 106         int n = 0;
 107         register u_char *bp, *ep;
 108
 109         cc = p->cc;
 110         if (p->cc == 0) {
 111                 /*
 112                  * Has "pcap_breakloop()" been called?
 113                  */
 114                 if (p->break_loop) {
 115                         /*
 116                          * Yes - clear the flag that indicates that it
 117                          * has, and return -2 to indicate that we were
 118                          * told to break out of the loop.
 119                          */
 120                         p->break_loop = 0;
 121                         return (-2);
 122                 }
 123
 124             /* capture the packets */
 125                 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
 126                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 127                         return (-1);
 128                 }
 129
 130                 cc = p->Packet->ulBytesReceived;
 131
 132                 bp = p->Packet->Buffer;
 133         }
 134         else
 135                 bp = p->bp;
 136
 137         /*
 138          * Loop through each packet.
 139          */
 140 #define bhp ((struct bpf_hdr *)bp)
 141         ep = bp + cc;
 142         while (1) {
 143                 register int caplen, hdrlen;
 144
 145                 /*
 146                  * Has "pcap_breakloop()" been called?
 147                  * If so, return immediately - if we haven't read any
 148                  * packets, clear the flag and return -2 to indicate
 149                  * that we were told to break out of the loop, otherwise
 150                  * leave the flag set, so that the *next* call will break
 151                  * out of the loop without having read any packets, and
 152                  * return the number of packets we've processed so far.
 153                  */
 154                 if (p->break_loop) {
 155                         if (n == 0) {
 156                                 p->break_loop = 0;
 157                                 return (-2);
 158                         } else {
 159                                 p->bp = bp;
 160                                 p->cc = ep - bp;
 161                                 return (n);
 162                         }
 163                 }
 164                 if (bp >= ep)
 165                         break;
 166
 167                 caplen = bhp->bh_caplen;
 168                 hdrlen = bhp->bh_hdrlen;
 169
 170                 /*
 171                  * XXX A bpf_hdr matches a pcap_pkthdr.
 172                  */
 173                 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
 174                 bp += BPF_WORDALIGN(caplen + hdrlen);
 175                 if (++n >= cnt && cnt > 0) {
 176                         p->bp = bp;
 177                         p->cc = ep - bp;
 178                         return (n);
 179                 }
 180         }
 181 #undef bhp
 182         p->cc = 0;
 183         return (n);
 184 }
 185
 186 #ifdef HAVE_DAG_API
 187 static int
 188 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 189 {
 190         u_char *dp = NULL;
 191         int     packet_len = 0, caplen = 0;
 192         struct pcap_pkthdr      pcap_header;
 193         u_char *endofbuf;
 194         int n = 0;
 195         dag_record_t *header;
 196         unsigned erf_record_len;
 197         ULONGLONG ts;
 198         int cc;
 199         unsigned swt;
 200         unsigned dfp = p->adapter->DagFastProcess;
 201
 202         cc = p->cc;
 203         if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
 204         {
 205             /* Get new packets from the network */
 206                 if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){
 207                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 208                         return (-1);
 209                 }
 210
 211                 cc = p->Packet->ulBytesReceived;
 212                 if(cc == 0)
 213                         /* The timeout has expired but we no packets arrived */
 214                         return 0;
 215                 header = (dag_record_t*)p->adapter->DagBuffer;
 216         }
 217         else
 218                 header = (dag_record_t*)p->bp;
 219
 220         endofbuf = (char*)header + cc;
 221
 222         /*
 223          * Cycle through the packets
 224          */
 225         do
 226         {
 227                 erf_record_len = SWAPS(header->rlen);
 228                 if((char*)header + erf_record_len > endofbuf)
 229                         break;
 230
 231                 /* Increase the number of captured packets */
 232                 p->md.stat.ps_recv++;
 233
 234                 /* Find the beginning of the packet */
 235                 dp = ((u_char *)header) + dag_record_size;
 236
 237                 /* Determine actual packet len */
 238                 switch(header->type)
 239                 {
 240                 case TYPE_ATM:
 241                         packet_len = ATM_SNAPLEN;
 242                         caplen = ATM_SNAPLEN;
 243                         dp += 4;
 244
 245                         break;
 246
 247                 case TYPE_ETH:
 248                         swt = SWAPS(header->wlen);
 249                         packet_len = swt - (p->md.dag_fcs_bits);
 250                         caplen = erf_record_len - dag_record_size - 2;
 251                         if (caplen > packet_len)
 252                         {
 253                                 caplen = packet_len;
 254                         }
 255                         dp += 2;
 256
 257                         break;
 258
 259                 case TYPE_HDLC_POS:
 260                         swt = SWAPS(header->wlen);
 261                         packet_len = swt - (p->md.dag_fcs_bits);
 262                         caplen = erf_record_len - dag_record_size;
 263                         if (caplen > packet_len)
 264                         {
 265                                 caplen = packet_len;
 266                         }
 267
 268                         break;
 269                 }
 270
 271                 if(caplen > p->snapshot)
 272                         caplen = p->snapshot;
 273
 274                 /*
 275                  * Has "pcap_breakloop()" been called?
 276                  * If so, return immediately - if we haven't read any
 277                  * packets, clear the flag and return -2 to indicate
 278                  * that we were told to break out of the loop, otherwise
 279                  * leave the flag set, so that the *next* call will break
 280                  * out of the loop without having read any packets, and
 281                  * return the number of packets we've processed so far.
 282                  */
 283                 if (p->break_loop)
 284                 {
 285                         if (n == 0)
 286                         {
 287                                 p->break_loop = 0;
 288                                 return (-2);
 289                         }
 290                         else
 291                         {
 292                                 p->bp = (char*)header;
 293                                 p->cc = endofbuf - (char*)header;
 294                                 return (n);
 295                         }
 296                 }
 297
 298                 if(!dfp)
 299                 {
 300                         /* convert between timestamp formats */
 301                         ts = header->ts;
 302                         pcap_header.ts.tv_sec = (int)(ts >> 32);
 303                         ts = (ts & 0xffffffffi64) * 1000000;
 304                         ts += 0x80000000; /* rounding */
 305                         pcap_header.ts.tv_usec = (int)(ts >> 32);
 306                         if (pcap_header.ts.tv_usec >= 1000000) {
 307                                 pcap_header.ts.tv_usec -= 1000000;
 308                                 pcap_header.ts.tv_sec++;
 309                         }
 310                 }
 311
 312                 /* No underlaying filtering system. We need to filter on our own */
 313                 if (p->fcode.bf_insns)
 314                 {
 315                         if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
 316                         {
 317                                 /* Move to next packet */
 318                                 header = (dag_record_t*)((char*)header + erf_record_len);
 319                                 continue;
 320                         }
 321                 }
 322
 323                 /* Fill the header for the user suppplied callback function */
 324                 pcap_header.caplen = caplen;
 325                 pcap_header.len = packet_len;
 326
 327                 /* Call the callback function */
 328                 (*callback)(user, &pcap_header, dp);
 329
 330                 /* Move to next packet */
 331                 header = (dag_record_t*)((char*)header + erf_record_len);
 332
 333                 /* Stop if the number of packets requested by user has been reached*/
 334                 if (++n >= cnt && cnt > 0)
 335                 {
 336                         p->bp = (char*)header;
 337                         p->cc = endofbuf - (char*)header;
 338                         return (n);
 339                 }
 340         }
 341         while((u_char*)header < endofbuf);
 342
 343   return 1;
 344 }
 345 #endif /* HAVE_DAG_API */
 346
 347 /* Send a packet to the network */
 348 static int
 349 pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
 350         LPPACKET PacketToSend;
 351
 352         PacketToSend=PacketAllocatePacket();
 353
 354         if (PacketToSend == NULL)
 355         {
 356                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
 357                 return -1;
 358         }
 359
 360         PacketInitPacket(PacketToSend,(PVOID)buf,size);
 361         if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
 362                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
 363                 PacketFreePacket(PacketToSend);
 364                 return -1;
 365         }
 366
 367         PacketFreePacket(PacketToSend);
 368
 369         /*
 370          * We assume it all got sent if "PacketSendPacket()" succeeded.
 371          * "pcap_inject()" is expected to return the number of bytes
 372          * sent.
 373          */
 374         return size;
 375 }
 376
 377 static void
 378 pcap_close_win32(pcap_t *p)
 379 {
 380         pcap_close_common(p);
 381         if (p->adapter != NULL) {
 382                 PacketCloseAdapter(p->adapter);
 383                 p->adapter = NULL;
 384         }
 385         if (p->Packet) {
 386                 PacketFreePacket(p->Packet);
 387                 p->Packet = NULL;
 388         }
 389 }
 390
 391 pcap_t *
 392 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
 393     char *ebuf)
 394 {
 395         register pcap_t *p;
 396         NetType type;
 397
 398         /* Init WinSock */
 399         wsockinit();
 400
 401         p = (pcap_t *)malloc(sizeof(*p));
 402         if (p == NULL)
 403         {
 404                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 405                 return (NULL);
 406         }
 407         memset(p, 0, sizeof(*p));
 408         p->adapter=NULL;
 409
 410         p->adapter = PacketOpenAdapter((char*)device);
 411
 412         if (p->adapter == NULL)
 413         {
 414                 /* Adapter detected but we are not able to open it. Return failure. */
 415                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
 416                 return NULL;
 417         }
 418
 419         /*get network type*/
 420         if(PacketGetNetType (p->adapter,&type) == FALSE)
 421         {
 422                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
 423                 goto bad;
 424         }
 425
 426         /*Set the linktype*/
 427         switch (type.LinkType)
 428         {
 429         case NdisMediumWan:
 430                 p->linktype = DLT_EN10MB;
 431                 break;
 432
 433         case NdisMedium802_3:
 434                 p->linktype = DLT_EN10MB;
 435                 /*
 436                  * This is (presumably) a real Ethernet capture; give it a
 437                  * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
 438                  * that an application can let you choose it, in case you're
 439                  * capturing DOCSIS traffic that a Cisco Cable Modem
 440                  * Termination System is putting out onto an Ethernet (it
 441                  * doesn't put an Ethernet header onto the wire, it puts raw
 442                  * DOCSIS frames out on the wire inside the low-level
 443                  * Ethernet framing).
 444                  */
 445                 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
 446                 /*
 447                  * If that fails, just leave the list empty.
 448                  */
 449                 if (p->dlt_list != NULL) {
 450                         p->dlt_list[0] = DLT_EN10MB;
 451                         p->dlt_list[1] = DLT_DOCSIS;
 452                         p->dlt_count = 2;
 453                 }
 454                 break;
 455
 456         case NdisMediumFddi:
 457                 p->linktype = DLT_FDDI;
 458                 break;
 459
 460         case NdisMedium802_5:
 461                 p->linktype = DLT_IEEE802;
 462                 break;
 463
 464         case NdisMediumArcnetRaw:
 465                 p->linktype = DLT_ARCNET;
 466                 break;
 467
 468         case NdisMediumArcnet878_2:
 469                 p->linktype = DLT_ARCNET;
 470                 break;
 471
 472         case NdisMediumAtm:
 473                 p->linktype = DLT_ATM_RFC1483;
 474                 break;
 475
 476         case NdisMediumCHDLC:
 477                 p->linktype = DLT_CHDLC;
 478                 break;
 479
 480         case NdisMediumPPPSerial:
 481                 p->linktype = DLT_PPP_SERIAL;
 482                 break;
 483
 484         case NdisMediumNull:
 485                 p->linktype = DLT_NULL;
 486                 break;
 487
 488         default:
 489                 p->linktype = DLT_EN10MB;                       /*an unknown adapter is assumed to be ethernet*/
 490                 break;
 491         }
 492
 493         /* Set promisquous mode */
 494         if (promisc) PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS);
 495          else PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL);
 496
 497         /* Set the buffer size */
 498         p->bufsize = PcapBufSize;
 499
 500         /* allocate Packet structure used during the capture */
 501         if((p->Packet = PacketAllocatePacket())==NULL)
 502         {
 503                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
 504                 goto bad;
 505         }
 506
 507         if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
 508         {
 509         /*
 510          * Traditional Adapter
 511          */
 512
 513                 p->buffer = (u_char *)malloc(PcapBufSize);
 514                 if (p->buffer == NULL)
 515                 {
 516                         snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 517                         goto bad;
 518                 }
 519
 520                 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
 521
 522                 p->snapshot = snaplen;
 523
 524                 /* allocate the standard buffer in the driver */
 525                 if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
 526                 {
 527                         snprintf(ebuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
 528                         goto bad;
 529                 }
 530
 531                 /* tell the driver to copy the buffer only if it contains at least 16K */
 532                 if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
 533                 {
 534                         snprintf(ebuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
 535                         goto bad;
 536                 }
 537         }
 538         else
 539 #ifdef HAVE_DAG_API
 540         {
 541         /*
 542          * Dag Card
 543          */
 544                 LONG    status;
 545                 HKEY    dagkey;
 546                 DWORD   lptype;
 547                 DWORD   lpcbdata;
 548                 int             postype = 0;
 549                 char    keyname[512];
 550
 551                 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
 552                         "SYSTEM\\CurrentControlSet\\Services\\DAG",
 553                         strstr(_strlwr((char*)device), "dag"));
 554                 do
 555                 {
 556                         status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
 557                         if(status != ERROR_SUCCESS)
 558                                 break;
 559
 560                         status = RegQueryValueEx(dagkey,
 561                                 "PosType",
 562                                 NULL,
 563                                 &lptype,
 564                                 (char*)&postype,
 565                                 &lpcbdata);
 566
 567                         if(status != ERROR_SUCCESS)
 568                         {
 569                                 postype = 0;
 570                         }
 571
 572                         RegCloseKey(dagkey);
 573                 }
 574                 while(FALSE);
 575
 576
 577                 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
 578
 579                 /* Set the length of the FCS associated to any packet. This value
 580                  * will be subtracted to the packet length */
 581                 p->md.dag_fcs_bits = p->adapter->DagFcsLen;
 582         }
 583 #else
 584         goto bad;
 585 #endif /* HAVE_DAG_API */
 586
 587         PacketSetReadTimeout(p->adapter, to_ms);
 588
 589 #ifdef HAVE_DAG_API
 590         if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
 591         {
 592                 /* install dag specific handlers for read and setfilter */
 593                 p->read_op = pcap_read_win32_dag;
 594                 p->setfilter_op = pcap_setfilter_win32_dag;
 595         }
 596         else
 597         {
 598 #endif /* HAVE_DAG_API */
 599                 /* install traditional npf handlers for read and setfilter */
 600                 p->read_op = pcap_read_win32_npf;
 601                 p->setfilter_op = pcap_setfilter_win32_npf;
 602 #ifdef HAVE_DAG_API
 603         }
 604 #endif /* HAVE_DAG_API */
 605         p->inject_op = pcap_inject_win32;
 606         p->set_datalink_op = NULL;      /* can't change data link type */
 607         p->getnonblock_op = pcap_getnonblock_win32;
 608         p->setnonblock_op = pcap_setnonblock_win32;
 609         p->stats_op = pcap_stats_win32;
 610         p->close_op = pcap_close_win32;
 611
 612         return (p);
 613 bad:
 614         if (p->adapter)
 615             PacketCloseAdapter(p->adapter);
 616         if (p->buffer != NULL)
 617                 free(p->buffer);
 618         if(p->Packet)
 619                 PacketFreePacket(p->Packet);
 620         /*
 621          * Get rid of any link-layer type list we allocated.
 622          */
 623         if (p->dlt_list != NULL)
 624                 free(p->dlt_list);
 625         free(p);
 626         return (NULL);
 627 }
 628
 629
 630 static int
 631 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
 632 {
 633         if(PacketSetBpf(p->adapter,fp)==FALSE){
 634                 /*
 635                  * Kernel filter not installed.
 636                  * XXX - fall back on userland filtering, as is done
 637                  * on other platforms?
 638                  */
 639                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
 640                 return (-1);
 641         }
 642
 643         /*
 644          * Discard any previously-received packets, as they might have
 645          * passed whatever filter was formerly in effect, but might
 646          * not pass this filter (BIOCSETF discards packets buffered
 647          * in the kernel, so you can lose packets in any case).
 648          */
 649         p->cc = 0;
 650         return (0);
 651 }
 652
 653 /*
 654  * We filter at user level, since the kernel driver does't process the packets
 655  */
 656 static int
 657 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
 658
 659         if(!fp)
 660         {
 661                 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
 662                 return -1;
 663         }
 664
 665         /* Install a user level filter */
 666         if (install_bpf_program(p, fp) < 0)
 667         {
 668                 snprintf(p->errbuf, sizeof(p->errbuf),
 669                         "setfilter, unable to install the filter: %s", pcap_strerror(errno));
 670                 return -1;
 671         }
 672
 673         p->md.use_bpf = 0;
 674
 675         return (0);
 676 }
 677
 678 static int
 679 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
 680 {
 681         /*
 682          * XXX - if there were a PacketGetReadTimeout() call, we
 683          * would use it, and return 1 if the timeout is -1
 684          * and 0 otherwise.
 685          */
 686         return (p->nonblock);
 687 }
 688
 689 static int
 690 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
 691 {
 692         int newtimeout;
 693
 694         if (nonblock) {
 695                 /*
 696                  * Set the read timeout to -1 for non-blocking mode.
 697                  */
 698                 newtimeout = -1;
 699         } else {
 700                 /*
 701                  * Restore the timeout set when the device was opened.
 702                  * (Note that this may be -1, in which case we're not
 703                  * really leaving non-blocking mode.)
 704                  */
 705                 newtimeout = p->timeout;
 706         }
 707         if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
 708                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 709                     "PacketSetReadTimeout: %s", pcap_win32strerror());
 710                 return (-1);
 711         }
 712         p->nonblock = (newtimeout == -1);
 713         return (0);
 714 }
 715
 716 /* Set the driver working mode */
 717 int
 718 pcap_setmode(pcap_t *p, int mode){
 719
 720         if (p->adapter==NULL)
 721         {
 722                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode while reading from a file");
 723                 return -1;
 724         }
 725
 726         if(PacketSetMode(p->adapter,mode)==FALSE)
 727         {
 728                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 729                 return -1;
 730         }
 731
 732         return 0;
 733 }
 734
 735 /* Set the dimension of the kernel-level capture buffer */
 736 int
 737 pcap_setbuff(pcap_t *p, int dim)
 738 {
 739         if (p->adapter==NULL)
 740         {
 741                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set while reading from a file");
 742                 return -1;
 743         }
 744
 745         if(PacketSetBuff(p->adapter,dim)==FALSE)
 746         {
 747                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 748                 return -1;
 749         }
 750         return 0;
 751 }
 752
 753 /*set the minimum amount of data that will release a read call*/
 754 int
 755 pcap_setmintocopy(pcap_t *p, int size)
 756 {
 757         if (p->adapter==NULL)
 758         {
 759                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Impossible to set the mintocopy parameter on an offline capture");
 760                 return -1;
 761         }
 762
 763         if(PacketSetMinToCopy(p->adapter, size)==FALSE)
 764         {
 765                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 766                 return -1;
 767         }
 768         return 0;
 769 }