contrib/libpcap/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 1.25.2.7 2007/06/14 22:07:14 gianluca Exp $ (LBL)";
  37 #endif
  38
  39 #include <pcap-int.h>
  40 #include <Packet32.h>
  41 #include <Ntddndis.h>
  42 #ifdef HAVE_DAG_API
  43 #include <dagnew.h>
  44 #include <dagapi.h>
  45 #endif /* HAVE_DAG_API */
  46 #ifdef __MINGW32__
  47 int* _errno();
  48 #define errno (*_errno())
  49 #endif /* __MINGW32__ */
  50
  51 static int pcap_setfilter_win32_npf(pcap_t *, struct bpf_program *);
  52 static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *);
  53 static int pcap_getnonblock_win32(pcap_t *, char *);
  54 static int pcap_setnonblock_win32(pcap_t *, int, char *);
  55
  56 #define PcapBufSize 256000      /*dimension of the buffer in the pcap_t structure*/
  57 #define SIZE_BUF 1000000
  58
  59 /* Equivalent to ntohs(), but a lot faster under Windows */
  60 #define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
  61
  62 /*
  63  * Header that the WinPcap driver associates to the packets.
  64  * Once was in bpf.h
  65  */
  66 struct bpf_hdr {
  67         struct timeval  bh_tstamp;      /* time stamp */
  68         bpf_u_int32     bh_caplen;      /* length of captured portion */
  69         bpf_u_int32     bh_datalen;     /* original length of packet */
  70         u_short         bh_hdrlen;      /* length of bpf header (this struct
  71                                            plus alignment padding) */
  72 };
  73
  74 /* Start winsock */
  75 int
  76 wsockinit()
  77 {
  78         WORD wVersionRequested;
  79         WSADATA wsaData;
  80         int err;
  81         wVersionRequested = MAKEWORD( 1, 1);
  82         err = WSAStartup( wVersionRequested, &wsaData );
  83         if ( err != 0 )
  84         {
  85                 return -1;
  86         }
  87         return 0;
  88 }
  89
  90
  91 static int
  92 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
  93 {
  94
  95         if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
  96                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
  97                 return -1;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static int
 104 pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 105 {
 106         int cc;
 107         int n = 0;
 108         register u_char *bp, *ep;
 109
 110         cc = p->cc;
 111         if (p->cc == 0) {
 112                 /*
 113                  * Has "pcap_breakloop()" been called?
 114                  */
 115                 if (p->break_loop) {
 116                         /*
 117                          * Yes - clear the flag that indicates that it
 118                          * has, and return -2 to indicate that we were
 119                          * told to break out of the loop.
 120                          */
 121                         p->break_loop = 0;
 122                         return (-2);
 123                 }
 124
 125             /* capture the packets */
 126                 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
 127                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 128                         return (-1);
 129                 }
 130
 131                 cc = p->Packet->ulBytesReceived;
 132
 133                 bp = p->Packet->Buffer;
 134         }
 135         else
 136                 bp = p->bp;
 137
 138         /*
 139          * Loop through each packet.
 140          */
 141 #define bhp ((struct bpf_hdr *)bp)
 142         ep = bp + cc;
 143         while (1) {
 144                 register int caplen, hdrlen;
 145
 146                 /*
 147                  * Has "pcap_breakloop()" been called?
 148                  * If so, return immediately - if we haven't read any
 149                  * packets, clear the flag and return -2 to indicate
 150                  * that we were told to break out of the loop, otherwise
 151                  * leave the flag set, so that the *next* call will break
 152                  * out of the loop without having read any packets, and
 153                  * return the number of packets we've processed so far.
 154                  */
 155                 if (p->break_loop) {
 156                         if (n == 0) {
 157                                 p->break_loop = 0;
 158                                 return (-2);
 159                         } else {
 160                                 p->bp = bp;
 161                                 p->cc = ep - bp;
 162                                 return (n);
 163                         }
 164                 }
 165                 if (bp >= ep)
 166                         break;
 167
 168                 caplen = bhp->bh_caplen;
 169                 hdrlen = bhp->bh_hdrlen;
 170
 171                 /*
 172                  * XXX A bpf_hdr matches a pcap_pkthdr.
 173                  */
 174                 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
 175                 bp += BPF_WORDALIGN(caplen + hdrlen);
 176                 if (++n >= cnt && cnt > 0) {
 177                         p->bp = bp;
 178                         p->cc = ep - bp;
 179                         return (n);
 180                 }
 181         }
 182 #undef bhp
 183         p->cc = 0;
 184         return (n);
 185 }
 186
 187 #ifdef HAVE_DAG_API
 188 static int
 189 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 190 {
 191         u_char *dp = NULL;
 192         int     packet_len = 0, caplen = 0;
 193         struct pcap_pkthdr      pcap_header;
 194         u_char *endofbuf;
 195         int n = 0;
 196         dag_record_t *header;
 197         unsigned erf_record_len;
 198         ULONGLONG ts;
 199         int cc;
 200         unsigned swt;
 201         unsigned dfp = p->adapter->DagFastProcess;
 202
 203         cc = p->cc;
 204         if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
 205         {
 206             /* Get new packets from the network */
 207                 if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){
 208                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 209                         return (-1);
 210                 }
 211
 212                 cc = p->Packet->ulBytesReceived;
 213                 if(cc == 0)
 214                         /* The timeout has expired but we no packets arrived */
 215                         return 0;
 216                 header = (dag_record_t*)p->adapter->DagBuffer;
 217         }
 218         else
 219                 header = (dag_record_t*)p->bp;
 220
 221         endofbuf = (char*)header + cc;
 222
 223         /*
 224          * Cycle through the packets
 225          */
 226         do
 227         {
 228                 erf_record_len = SWAPS(header->rlen);
 229                 if((char*)header + erf_record_len > endofbuf)
 230                         break;
 231
 232                 /* Increase the number of captured packets */
 233                 p->md.stat.ps_recv++;
 234
 235                 /* Find the beginning of the packet */
 236                 dp = ((u_char *)header) + dag_record_size;
 237
 238                 /* Determine actual packet len */
 239                 switch(header->type)
 240                 {
 241                 case TYPE_ATM:
 242                         packet_len = ATM_SNAPLEN;
 243                         caplen = ATM_SNAPLEN;
 244                         dp += 4;
 245
 246                         break;
 247
 248                 case TYPE_ETH:
 249                         swt = SWAPS(header->wlen);
 250                         packet_len = swt - (p->md.dag_fcs_bits);
 251                         caplen = erf_record_len - dag_record_size - 2;
 252                         if (caplen > packet_len)
 253                         {
 254                                 caplen = packet_len;
 255                         }
 256                         dp += 2;
 257
 258                         break;
 259
 260                 case TYPE_HDLC_POS:
 261                         swt = SWAPS(header->wlen);
 262                         packet_len = swt - (p->md.dag_fcs_bits);
 263                         caplen = erf_record_len - dag_record_size;
 264                         if (caplen > packet_len)
 265                         {
 266                                 caplen = packet_len;
 267                         }
 268
 269                         break;
 270                 }
 271
 272                 if(caplen > p->snapshot)
 273                         caplen = p->snapshot;
 274
 275                 /*
 276                  * Has "pcap_breakloop()" been called?
 277                  * If so, return immediately - if we haven't read any
 278                  * packets, clear the flag and return -2 to indicate
 279                  * that we were told to break out of the loop, otherwise
 280                  * leave the flag set, so that the *next* call will break
 281                  * out of the loop without having read any packets, and
 282                  * return the number of packets we've processed so far.
 283                  */
 284                 if (p->break_loop)
 285                 {
 286                         if (n == 0)
 287                         {
 288                                 p->break_loop = 0;
 289                                 return (-2);
 290                         }
 291                         else
 292                         {
 293                                 p->bp = (char*)header;
 294                                 p->cc = endofbuf - (char*)header;
 295                                 return (n);
 296                         }
 297                 }
 298
 299                 if(!dfp)
 300                 {
 301                         /* convert between timestamp formats */
 302                         ts = header->ts;
 303                         pcap_header.ts.tv_sec = (int)(ts >> 32);
 304                         ts = (ts & 0xffffffffi64) * 1000000;
 305                         ts += 0x80000000; /* rounding */
 306                         pcap_header.ts.tv_usec = (int)(ts >> 32);
 307                         if (pcap_header.ts.tv_usec >= 1000000) {
 308                                 pcap_header.ts.tv_usec -= 1000000;
 309                                 pcap_header.ts.tv_sec++;
 310                         }
 311                 }
 312
 313                 /* No underlaying filtering system. We need to filter on our own */
 314                 if (p->fcode.bf_insns)
 315                 {
 316                         if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
 317                         {
 318                                 /* Move to next packet */
 319                                 header = (dag_record_t*)((char*)header + erf_record_len);
 320                                 continue;
 321                         }
 322                 }
 323
 324                 /* Fill the header for the user suppplied callback function */
 325                 pcap_header.caplen = caplen;
 326                 pcap_header.len = packet_len;
 327
 328                 /* Call the callback function */
 329                 (*callback)(user, &pcap_header, dp);
 330
 331                 /* Move to next packet */
 332                 header = (dag_record_t*)((char*)header + erf_record_len);
 333
 334                 /* Stop if the number of packets requested by user has been reached*/
 335                 if (++n >= cnt && cnt > 0)
 336                 {
 337                         p->bp = (char*)header;
 338                         p->cc = endofbuf - (char*)header;
 339                         return (n);
 340                 }
 341         }
 342         while((u_char*)header < endofbuf);
 343
 344   return 1;
 345 }
 346 #endif /* HAVE_DAG_API */
 347
 348 /* Send a packet to the network */
 349 static int
 350 pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
 351         LPPACKET PacketToSend;
 352
 353         PacketToSend=PacketAllocatePacket();
 354
 355         if (PacketToSend == NULL)
 356         {
 357                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
 358                 return -1;
 359         }
 360
 361         PacketInitPacket(PacketToSend,(PVOID)buf,size);
 362         if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
 363                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
 364                 PacketFreePacket(PacketToSend);
 365                 return -1;
 366         }
 367
 368         PacketFreePacket(PacketToSend);
 369
 370         /*
 371          * We assume it all got sent if "PacketSendPacket()" succeeded.
 372          * "pcap_inject()" is expected to return the number of bytes
 373          * sent.
 374          */
 375         return size;
 376 }
 377
 378 static void
 379 pcap_close_win32(pcap_t *p)
 380 {
 381         pcap_close_common(p);
 382         if (p->adapter != NULL) {
 383                 PacketCloseAdapter(p->adapter);
 384                 p->adapter = NULL;
 385         }
 386         if (p->Packet) {
 387                 PacketFreePacket(p->Packet);
 388                 p->Packet = NULL;
 389         }
 390 }
 391
 392 pcap_t *
 393 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
 394     char *ebuf)
 395 {
 396         register pcap_t *p;
 397         NetType type;
 398
 399         /* Init WinSock */
 400         wsockinit();
 401
 402         p = (pcap_t *)malloc(sizeof(*p));
 403         if (p == NULL)
 404         {
 405                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 406                 return (NULL);
 407         }
 408         memset(p, 0, sizeof(*p));
 409         p->adapter=NULL;
 410
 411         p->adapter = PacketOpenAdapter((char*)device);
 412
 413         if (p->adapter == NULL)
 414         {
 415                 free(p);
 416                 /* Adapter detected but we are not able to open it. Return failure. */
 417                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
 418                 return NULL;
 419         }
 420
 421         /*get network type*/
 422         if(PacketGetNetType (p->adapter,&type) == FALSE)
 423         {
 424                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
 425                 goto bad;
 426         }
 427
 428         /*Set the linktype*/
 429         switch (type.LinkType)
 430         {
 431         case NdisMediumWan:
 432                 p->linktype = DLT_EN10MB;
 433                 break;
 434
 435         case NdisMedium802_3:
 436                 p->linktype = DLT_EN10MB;
 437                 /*
 438                  * This is (presumably) a real Ethernet capture; give it a
 439                  * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
 440                  * that an application can let you choose it, in case you're
 441                  * capturing DOCSIS traffic that a Cisco Cable Modem
 442                  * Termination System is putting out onto an Ethernet (it
 443                  * doesn't put an Ethernet header onto the wire, it puts raw
 444                  * DOCSIS frames out on the wire inside the low-level
 445                  * Ethernet framing).
 446                  */
 447                 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
 448                 /*
 449                  * If that fails, just leave the list empty.
 450                  */
 451                 if (p->dlt_list != NULL) {
 452                         p->dlt_list[0] = DLT_EN10MB;
 453                         p->dlt_list[1] = DLT_DOCSIS;
 454                         p->dlt_count = 2;
 455                 }
 456                 break;
 457
 458         case NdisMediumFddi:
 459                 p->linktype = DLT_FDDI;
 460                 break;
 461
 462         case NdisMedium802_5:
 463                 p->linktype = DLT_IEEE802;
 464                 break;
 465
 466         case NdisMediumArcnetRaw:
 467                 p->linktype = DLT_ARCNET;
 468                 break;
 469
 470         case NdisMediumArcnet878_2:
 471                 p->linktype = DLT_ARCNET;
 472                 break;
 473
 474         case NdisMediumAtm:
 475                 p->linktype = DLT_ATM_RFC1483;
 476                 break;
 477
 478         case NdisMediumCHDLC:
 479                 p->linktype = DLT_CHDLC;
 480                 break;
 481
 482         case NdisMediumPPPSerial:
 483                 p->linktype = DLT_PPP_SERIAL;
 484                 break;
 485
 486         case NdisMediumNull:
 487                 p->linktype = DLT_NULL;
 488                 break;
 489
 490         case NdisMediumBare80211:
 491                 p->linktype = DLT_IEEE802_11;
 492                 break;
 493
 494         case NdisMediumRadio80211:
 495                 p->linktype = DLT_IEEE802_11_RADIO;
 496                 break;
 497
 498         case NdisMediumPpi:
 499                 p->linktype = DLT_PPI;
 500                 break;
 501
 502         default:
 503                 p->linktype = DLT_EN10MB;                       /*an unknown adapter is assumed to be ethernet*/
 504                 break;
 505         }
 506
 507         /* Set promiscuous mode */
 508         if (promisc)
 509         {
 510
 511                 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
 512                 {
 513                         snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
 514                         goto bad;
 515                 }
 516         }
 517         else
 518         {
 519                 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE)
 520                 {
 521                         snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
 522                         goto bad;
 523                 }
 524         }
 525
 526         /* Set the buffer size */
 527         p->bufsize = PcapBufSize;
 528
 529         /* Store the timeout. Used by pcap_setnonblock() */
 530         p->timeout= to_ms;
 531
 532         /* allocate Packet structure used during the capture */
 533         if((p->Packet = PacketAllocatePacket())==NULL)
 534         {
 535                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
 536                 goto bad;
 537         }
 538
 539         if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
 540         {
 541         /*
 542          * Traditional Adapter
 543          */
 544
 545                 p->buffer = (u_char *)malloc(PcapBufSize);
 546                 if (p->buffer == NULL)
 547                 {
 548                         snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 549                         goto bad;
 550                 }
 551
 552                 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
 553
 554                 p->snapshot = snaplen;
 555
 556                 /* allocate the standard buffer in the driver */
 557                 if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
 558                 {
 559                         snprintf(ebuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
 560                         goto bad;
 561                 }
 562
 563                 /* tell the driver to copy the buffer only if it contains at least 16K */
 564                 if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
 565                 {
 566                         snprintf(ebuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
 567                         goto bad;
 568                 }
 569         }
 570         else
 571 #ifdef HAVE_DAG_API
 572         {
 573         /*
 574          * Dag Card
 575          */
 576                 LONG    status;
 577                 HKEY    dagkey;
 578                 DWORD   lptype;
 579                 DWORD   lpcbdata;
 580                 int             postype = 0;
 581                 char    keyname[512];
 582
 583                 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
 584                         "SYSTEM\\CurrentControlSet\\Services\\DAG",
 585                         strstr(_strlwr((char*)device), "dag"));
 586                 do
 587                 {
 588                         status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
 589                         if(status != ERROR_SUCCESS)
 590                                 break;
 591
 592                         status = RegQueryValueEx(dagkey,
 593                                 "PosType",
 594                                 NULL,
 595                                 &lptype,
 596                                 (char*)&postype,
 597                                 &lpcbdata);
 598
 599                         if(status != ERROR_SUCCESS)
 600                         {
 601                                 postype = 0;
 602                         }
 603
 604                         RegCloseKey(dagkey);
 605                 }
 606                 while(FALSE);
 607
 608
 609                 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
 610
 611                 /* Set the length of the FCS associated to any packet. This value
 612                  * will be subtracted to the packet length */
 613                 p->md.dag_fcs_bits = p->adapter->DagFcsLen;
 614         }
 615 #else
 616         goto bad;
 617 #endif /* HAVE_DAG_API */
 618
 619         PacketSetReadTimeout(p->adapter, to_ms);
 620
 621 #ifdef HAVE_DAG_API
 622         if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
 623         {
 624                 /* install dag specific handlers for read and setfilter */
 625                 p->read_op = pcap_read_win32_dag;
 626                 p->setfilter_op = pcap_setfilter_win32_dag;
 627         }
 628         else
 629         {
 630 #endif /* HAVE_DAG_API */
 631                 /* install traditional npf handlers for read and setfilter */
 632                 p->read_op = pcap_read_win32_npf;
 633                 p->setfilter_op = pcap_setfilter_win32_npf;
 634 #ifdef HAVE_DAG_API
 635         }
 636 #endif /* HAVE_DAG_API */
 637         p->setdirection_op = NULL;      /* Not implemented. */
 638             /* XXX - can this be implemented on some versions of Windows? */
 639         p->inject_op = pcap_inject_win32;
 640         p->set_datalink_op = NULL;      /* can't change data link type */
 641         p->getnonblock_op = pcap_getnonblock_win32;
 642         p->setnonblock_op = pcap_setnonblock_win32;
 643         p->stats_op = pcap_stats_win32;
 644         p->close_op = pcap_close_win32;
 645
 646         return (p);
 647 bad:
 648         if (p->adapter)
 649             PacketCloseAdapter(p->adapter);
 650         if (p->buffer != NULL)
 651                 free(p->buffer);
 652         if(p->Packet)
 653                 PacketFreePacket(p->Packet);
 654         /*
 655          * Get rid of any link-layer type list we allocated.
 656          */
 657         if (p->dlt_list != NULL)
 658                 free(p->dlt_list);
 659         free(p);
 660         return (NULL);
 661 }
 662
 663
 664 static int
 665 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
 666 {
 667         if(PacketSetBpf(p->adapter,fp)==FALSE){
 668                 /*
 669                  * Kernel filter not installed.
 670                  * XXX - fall back on userland filtering, as is done
 671                  * on other platforms?
 672                  */
 673                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
 674                 return (-1);
 675         }
 676
 677         /*
 678          * Discard any previously-received packets, as they might have
 679          * passed whatever filter was formerly in effect, but might
 680          * not pass this filter (BIOCSETF discards packets buffered
 681          * in the kernel, so you can lose packets in any case).
 682          */
 683         p->cc = 0;
 684         return (0);
 685 }
 686
 687 /*
 688  * We filter at user level, since the kernel driver does't process the packets
 689  */
 690 static int
 691 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
 692
 693         if(!fp)
 694         {
 695                 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
 696                 return -1;
 697         }
 698
 699         /* Install a user level filter */
 700         if (install_bpf_program(p, fp) < 0)
 701         {
 702                 snprintf(p->errbuf, sizeof(p->errbuf),
 703                         "setfilter, unable to install the filter: %s", pcap_strerror(errno));
 704                 return -1;
 705         }
 706
 707         p->md.use_bpf = 0;
 708
 709         return (0);
 710 }
 711
 712 static int
 713 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
 714 {
 715         /*
 716          * XXX - if there were a PacketGetReadTimeout() call, we
 717          * would use it, and return 1 if the timeout is -1
 718          * and 0 otherwise.
 719          */
 720         return (p->nonblock);
 721 }
 722
 723 static int
 724 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
 725 {
 726         int newtimeout;
 727
 728         if (nonblock) {
 729                 /*
 730                  * Set the read timeout to -1 for non-blocking mode.
 731                  */
 732                 newtimeout = -1;
 733         } else {
 734                 /*
 735                  * Restore the timeout set when the device was opened.
 736                  * (Note that this may be -1, in which case we're not
 737                  * really leaving non-blocking mode.)
 738                  */
 739                 newtimeout = p->timeout;
 740         }
 741         if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
 742                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 743                     "PacketSetReadTimeout: %s", pcap_win32strerror());
 744                 return (-1);
 745         }
 746         p->nonblock = (newtimeout == -1);
 747         return (0);
 748 }
 749
 750 /* Set the driver working mode */
 751 int
 752 pcap_setmode(pcap_t *p, int mode){
 753
 754         if (p->adapter==NULL)
 755         {
 756                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode while reading from a file");
 757                 return -1;
 758         }
 759
 760         if(PacketSetMode(p->adapter,mode)==FALSE)
 761         {
 762                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 763                 return -1;
 764         }
 765
 766         return 0;
 767 }
 768
 769 /* Set the dimension of the kernel-level capture buffer */
 770 int
 771 pcap_setbuff(pcap_t *p, int dim)
 772 {
 773         if (p->adapter==NULL)
 774         {
 775                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set while reading from a file");
 776                 return -1;
 777         }
 778
 779         if(PacketSetBuff(p->adapter,dim)==FALSE)
 780         {
 781                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 782                 return -1;
 783         }
 784         return 0;
 785 }
 786
 787 /*set the minimum amount of data that will release a read call*/
 788 int
 789 pcap_setmintocopy(pcap_t *p, int size)
 790 {
 791         if (p->adapter==NULL)
 792         {
 793                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Impossible to set the mintocopy parameter on an offline capture");
 794                 return -1;
 795         }
 796
 797         if(PacketSetMinToCopy(p->adapter, size)==FALSE)
 798         {
 799                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 800                 return -1;
 801         }
 802         return 0;
 803 }