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 1.21 2004-03-23 19:18:07 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         PacketInitPacket(PacketToSend,buf,size);
 354         if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
 355                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
 356                 PacketFreePacket(PacketToSend);
 357                 return -1;
 358         }
 359
 360         PacketFreePacket(PacketToSend);
 361
 362         /*
 363          * We assume it all got sent if "PacketSendPacket()" succeeded.
 364          * "pcap_inject()" is expected to return the number of bytes
 365          * sent.
 366          */
 367         return size;
 368 }
 369
 370 static void
 371 pcap_close_win32(pcap_t *p)
 372 {
 373         if (p->buffer != NULL)
 374                 free(p->buffer);
 375         if (p->adapter != NULL) {
 376                 PacketCloseAdapter(p->adapter);
 377                 p->adapter = NULL;
 378         }
 379 }
 380
 381 pcap_t *
 382 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
 383     char *ebuf)
 384 {
 385         register pcap_t *p;
 386         NetType type;
 387
 388         /* Init WinSock */
 389         wsockinit();
 390
 391         p = (pcap_t *)malloc(sizeof(*p));
 392         if (p == NULL)
 393         {
 394                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 395                 return (NULL);
 396         }
 397         memset(p, 0, sizeof(*p));
 398         p->adapter=NULL;
 399
 400         p->adapter = PacketOpenAdapter((char*)device);
 401
 402         if (p->adapter == NULL)
 403         {
 404                 /* Adapter detected but we are not able to open it. Return failure. */
 405                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
 406                 return NULL;
 407         }
 408
 409         /*get network type*/
 410         if(PacketGetNetType (p->adapter,&type) == FALSE)
 411         {
 412                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
 413                 goto bad;
 414         }
 415
 416         /*Set the linktype*/
 417         switch (type.LinkType)
 418         {
 419         case NdisMediumWan:
 420                 p->linktype = DLT_EN10MB;
 421                 break;
 422
 423         case NdisMedium802_3:
 424                 p->linktype = DLT_EN10MB;
 425                 /*
 426                  * This is (presumably) a real Ethernet capture; give it a
 427                  * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
 428                  * that an application can let you choose it, in case you're
 429                  * capturing DOCSIS traffic that a Cisco Cable Modem
 430                  * Termination System is putting out onto an Ethernet (it
 431                  * doesn't put an Ethernet header onto the wire, it puts raw
 432                  * DOCSIS frames out on the wire inside the low-level
 433                  * Ethernet framing).
 434                  */
 435                 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
 436                 /*
 437                  * If that fails, just leave the list empty.
 438                  */
 439                 if (p->dlt_list != NULL) {
 440                         p->dlt_list[0] = DLT_EN10MB;
 441                         p->dlt_list[1] = DLT_DOCSIS;
 442                         p->dlt_count = 2;
 443                 }
 444                 break;
 445
 446         case NdisMediumFddi:
 447                 p->linktype = DLT_FDDI;
 448                 break;
 449
 450         case NdisMedium802_5:
 451                 p->linktype = DLT_IEEE802;
 452                 break;
 453
 454         case NdisMediumArcnetRaw:
 455                 p->linktype = DLT_ARCNET;
 456                 break;
 457
 458         case NdisMediumArcnet878_2:
 459                 p->linktype = DLT_ARCNET;
 460                 break;
 461
 462         case NdisMediumAtm:
 463                 p->linktype = DLT_ATM_RFC1483;
 464                 break;
 465
 466         case NdisMediumCHDLC:
 467                 p->linktype = DLT_CHDLC;
 468                 break;
 469
 470         case NdisMediumPPPSerial:
 471                 p->linktype = DLT_PPP_SERIAL;
 472                 break;
 473
 474         case NdisMediumNull:
 475                 p->linktype = DLT_NULL;
 476                 break;
 477
 478         default:
 479                 p->linktype = DLT_EN10MB;                       /*an unknown adapter is assumed to be ethernet*/
 480                 break;
 481         }
 482
 483         /* Set promisquous mode */
 484         if (promisc) PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS);
 485          else PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL);
 486
 487         /* Set the buffer size */
 488         p->bufsize = PcapBufSize;
 489
 490         /* allocate Packet structure used during the capture */
 491         if((p->Packet = PacketAllocatePacket())==NULL)
 492         {
 493                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
 494                 goto bad;
 495         }
 496
 497         if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
 498         {
 499         /*
 500          * Traditional Adapter
 501          */
 502
 503                 p->buffer = (u_char *)malloc(PcapBufSize);
 504                 if (p->buffer == NULL)
 505                 {
 506                         snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 507                         goto bad;
 508                 }
 509
 510                 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
 511
 512                 p->snapshot = snaplen;
 513
 514                 /* allocate the standard buffer in the driver */
 515                 if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
 516                 {
 517                         snprintf(ebuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
 518                         goto bad;
 519                 }
 520
 521                 /* tell the driver to copy the buffer only if it contains at least 16K */
 522                 if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
 523                 {
 524                         snprintf(ebuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
 525                         goto bad;
 526                 }
 527         }
 528         else
 529 #ifdef HAVE_DAG_API
 530         {
 531         /*
 532          * Dag Card
 533          */
 534                 LONG    status;
 535                 HKEY    dagkey;
 536                 DWORD   lptype;
 537                 DWORD   lpcbdata;
 538                 int             postype = 0;
 539                 char    keyname[512];
 540
 541                 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
 542                         "SYSTEM\\CurrentControlSet\\Services\\DAG",
 543                         strstr(_strlwr((char*)device), "dag"));
 544                 do
 545                 {
 546                         status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
 547                         if(status != ERROR_SUCCESS)
 548                                 break;
 549
 550                         status = RegQueryValueEx(dagkey,
 551                                 "PosType",
 552                                 NULL,
 553                                 &lptype,
 554                                 (char*)&postype,
 555                                 &lpcbdata);
 556
 557                         if(status != ERROR_SUCCESS)
 558                         {
 559                                 postype = 0;
 560                         }
 561
 562                         RegCloseKey(dagkey);
 563                 }
 564                 while(FALSE);
 565
 566
 567                 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
 568
 569                 /* Set the length of the FCS associated to any packet. This value
 570                  * will be subtracted to the packet length */
 571                 p->md.dag_fcs_bits = p->adapter->DagFcsLen;
 572         }
 573 #else
 574         goto bad;
 575 #endif /* HAVE_DAG_API */
 576
 577         PacketSetReadTimeout(p->adapter, to_ms);
 578
 579 #ifdef HAVE_DAG_API
 580         if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
 581         {
 582                 /* install dag specific handlers for read and setfilter */
 583                 p->read_op = pcap_read_win32_dag;
 584                 p->setfilter_op = pcap_setfilter_win32_dag;
 585         }
 586         else
 587         {
 588 #endif /* HAVE_DAG_API */
 589                 /* install traditional npf handlers for read and setfilter */
 590                 p->read_op = pcap_read_win32_npf;
 591                 p->setfilter_op = pcap_setfilter_win32_npf;
 592 #ifdef HAVE_DAG_API
 593         }
 594 #endif /* HAVE_DAG_API */
 595         p->inject_op = pcap_inject_win32;
 596         p->set_datalink_op = NULL;      /* can't change data link type */
 597         p->getnonblock_op = pcap_getnonblock_win32;
 598         p->setnonblock_op = pcap_setnonblock_win32;
 599         p->stats_op = pcap_stats_win32;
 600         p->close_op = pcap_close_win32;
 601
 602         return (p);
 603 bad:
 604         if (p->adapter)
 605             PacketCloseAdapter(p->adapter);
 606         if (p->buffer != NULL)
 607                 free(p->buffer);
 608         if(p->Packet)
 609                 PacketFreePacket(p->Packet);
 610         /*
 611          * Get rid of any link-layer type list we allocated.
 612          */
 613         if (p->dlt_list != NULL)
 614                 free(p->dlt_list);
 615         free(p);
 616         return (NULL);
 617 }
 618
 619
 620 static int
 621 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
 622 {
 623         if(PacketSetBpf(p->adapter,fp)==FALSE){
 624                 /* kernel filter not installed. */
 625                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
 626                 return (-1);
 627         }
 628         return (0);
 629 }
 630
 631 /*
 632  * We filter at user level, since the kernel driver does't process the packets
 633  */
 634 static int
 635 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
 636
 637         if(!fp)
 638         {
 639                 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
 640                 return -1;
 641         }
 642
 643         /* Install a user level filter */
 644         if (install_bpf_program(p, fp) < 0)
 645         {
 646                 snprintf(p->errbuf, sizeof(p->errbuf),
 647                         "setfilter, unable to install the filter: %s", pcap_strerror(errno));
 648                 return -1;
 649         }
 650
 651         p->md.use_bpf = 0;
 652
 653         return (0);
 654 }
 655
 656 static int
 657 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
 658 {
 659         /*
 660          * XXX - if there were a PacketGetReadTimeout() call, we
 661          * would use it, and return 1 if the timeout is -1
 662          * and 0 otherwise.
 663          */
 664         return (p->nonblock);
 665 }
 666
 667 static int
 668 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
 669 {
 670         int newtimeout;
 671
 672         if (nonblock) {
 673                 /*
 674                  * Set the read timeout to -1 for non-blocking mode.
 675                  */
 676                 newtimeout = -1;
 677         } else {
 678                 /*
 679                  * Restore the timeout set when the device was opened.
 680                  * (Note that this may be -1, in which case we're not
 681                  * really leaving non-blocking mode.)
 682                  */
 683                 newtimeout = p->timeout;
 684         }
 685         if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
 686                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 687                     "PacketSetReadTimeout: %s", pcap_win32strerror());
 688                 return (-1);
 689         }
 690         p->nonblock = (newtimeout == -1);
 691         return (0);
 692 }
 693
 694 /* Set the driver working mode */
 695 int
 696 pcap_setmode(pcap_t *p, int mode){
 697
 698         if (p->adapter==NULL)
 699         {
 700                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode while reading from a file");
 701                 return -1;
 702         }
 703
 704         if(PacketSetMode(p->adapter,mode)==FALSE)
 705         {
 706                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 707                 return -1;
 708         }
 709
 710         return 0;
 711 }
 712
 713 /* Set the dimension of the kernel-level capture buffer */
 714 int
 715 pcap_setbuff(pcap_t *p, int dim)
 716 {
 717         if (p->adapter==NULL)
 718         {
 719                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set while reading from a file");
 720                 return -1;
 721         }
 722
 723         if(PacketSetBuff(p->adapter,dim)==FALSE)
 724         {
 725                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 726                 return -1;
 727         }
 728         return 0;
 729 }
 730
 731 /*set the minimum amount of data that will release a read call*/
 732 int
 733 pcap_setmintocopy(pcap_t *p, int size)
 734 {
 735         if (p->adapter==NULL)
 736         {
 737                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Impossible to set the mintocopy parameter on an offline capture");
 738                 return -1;
 739         }
 740
 741         if(PacketSetMinToCopy(p->adapter, size)==FALSE)
 742         {
 743                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 744                 return -1;
 745         }
 746         return 0;
 747 }