pcap-win32.c revision 190225
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#ifndef lint 35static const char rcsid[] _U_ = 36 "@(#) $Header: /tcpdump/master/libpcap/pcap-win32.c,v 1.34.2.8 2008-05-21 22:11:26 gianluca Exp $ (LBL)"; 37#endif 38 39#include <pcap-int.h> 40#include <Packet32.h> 41#ifdef __MINGW32__ 42#include <ddk/ndis.h> 43#else /*__MINGW32__*/ 44#include <ntddndis.h> 45#endif /*__MINGW32__*/ 46#ifdef HAVE_DAG_API 47#include <dagnew.h> 48#include <dagapi.h> 49#endif /* HAVE_DAG_API */ 50#ifdef __MINGW32__ 51int* _errno(); 52#define errno (*_errno()) 53#endif /* __MINGW32__ */ 54 55static int pcap_setfilter_win32_npf(pcap_t *, struct bpf_program *); 56static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *); 57static int pcap_getnonblock_win32(pcap_t *, char *); 58static 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 * Header that the WinPcap driver associates to the packets. 71 * Once was in bpf.h 72 */ 73struct bpf_hdr { 74 struct timeval bh_tstamp; /* time stamp */ 75 bpf_u_int32 bh_caplen; /* length of captured portion */ 76 bpf_u_int32 bh_datalen; /* original length of packet */ 77 u_short bh_hdrlen; /* length of bpf header (this struct 78 plus alignment padding) */ 79}; 80 81/* Start winsock */ 82int 83wsockinit() 84{ 85 WORD wVersionRequested; 86 WSADATA wsaData; 87 int err; 88 wVersionRequested = MAKEWORD( 1, 1); 89 err = WSAStartup( wVersionRequested, &wsaData ); 90 if ( err != 0 ) 91 { 92 return -1; 93 } 94 return 0; 95} 96 97 98static int 99pcap_stats_win32(pcap_t *p, struct pcap_stat *ps) 100{ 101 102 if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){ 103 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror()); 104 return -1; 105 } 106 107 return 0; 108} 109 110/* Set the dimension of the kernel-level capture buffer */ 111static int 112pcap_setbuff_win32(pcap_t *p, int dim) 113{ 114 if(PacketSetBuff(p->adapter,dim)==FALSE) 115 { 116 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer"); 117 return -1; 118 } 119 return 0; 120} 121 122/* Set the driver working mode */ 123static int 124pcap_setmode_win32(pcap_t *p, int mode) 125{ 126 if(PacketSetMode(p->adapter,mode)==FALSE) 127 { 128 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized"); 129 return -1; 130 } 131 132 return 0; 133} 134 135/*set the minimum amount of data that will release a read call*/ 136static int 137pcap_setmintocopy_win32(pcap_t *p, int size) 138{ 139 if(PacketSetMinToCopy(p->adapter, size)==FALSE) 140 { 141 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size"); 142 return -1; 143 } 144 return 0; 145} 146 147static int 148pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 149{ 150 int cc; 151 int n = 0; 152 register u_char *bp, *ep; 153 154 cc = p->cc; 155 if (p->cc == 0) { 156 /* 157 * Has "pcap_breakloop()" been called? 158 */ 159 if (p->break_loop) { 160 /* 161 * Yes - clear the flag that indicates that it 162 * has, and return -2 to indicate that we were 163 * told to break out of the loop. 164 */ 165 p->break_loop = 0; 166 return (-2); 167 } 168 169 /* capture the packets */ 170 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){ 171 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed"); 172 return (-1); 173 } 174 175 cc = p->Packet->ulBytesReceived; 176 177 bp = p->Packet->Buffer; 178 } 179 else 180 bp = p->bp; 181 182 /* 183 * Loop through each packet. 184 */ 185#define bhp ((struct bpf_hdr *)bp) 186 ep = bp + cc; 187 while (1) { 188 register int caplen, hdrlen; 189 190 /* 191 * Has "pcap_breakloop()" been called? 192 * If so, return immediately - if we haven't read any 193 * packets, clear the flag and return -2 to indicate 194 * that we were told to break out of the loop, otherwise 195 * leave the flag set, so that the *next* call will break 196 * out of the loop without having read any packets, and 197 * return the number of packets we've processed so far. 198 */ 199 if (p->break_loop) { 200 if (n == 0) { 201 p->break_loop = 0; 202 return (-2); 203 } else { 204 p->bp = bp; 205 p->cc = ep - bp; 206 return (n); 207 } 208 } 209 if (bp >= ep) 210 break; 211 212 caplen = bhp->bh_caplen; 213 hdrlen = bhp->bh_hdrlen; 214 215 /* 216 * XXX A bpf_hdr matches a pcap_pkthdr. 217 */ 218 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen); 219 bp += BPF_WORDALIGN(caplen + hdrlen); 220 if (++n >= cnt && cnt > 0) { 221 p->bp = bp; 222 p->cc = ep - bp; 223 return (n); 224 } 225 } 226#undef bhp 227 p->cc = 0; 228 return (n); 229} 230 231#ifdef HAVE_DAG_API 232static int 233pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 234{ 235 u_char *dp = NULL; 236 int packet_len = 0, caplen = 0; 237 struct pcap_pkthdr pcap_header; 238 u_char *endofbuf; 239 int n = 0; 240 dag_record_t *header; 241 unsigned erf_record_len; 242 ULONGLONG ts; 243 int cc; 244 unsigned swt; 245 unsigned dfp = p->adapter->DagFastProcess; 246 247 cc = p->cc; 248 if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */ 249 { 250 /* Get new packets from the network */ 251 if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){ 252 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed"); 253 return (-1); 254 } 255 256 cc = p->Packet->ulBytesReceived; 257 if(cc == 0) 258 /* The timeout has expired but we no packets arrived */ 259 return 0; 260 header = (dag_record_t*)p->adapter->DagBuffer; 261 } 262 else 263 header = (dag_record_t*)p->bp; 264 265 endofbuf = (char*)header + cc; 266 267 /* 268 * Cycle through the packets 269 */ 270 do 271 { 272 erf_record_len = SWAPS(header->rlen); 273 if((char*)header + erf_record_len > endofbuf) 274 break; 275 276 /* Increase the number of captured packets */ 277 p->md.stat.ps_recv++; 278 279 /* Find the beginning of the packet */ 280 dp = ((u_char *)header) + dag_record_size; 281 282 /* Determine actual packet len */ 283 switch(header->type) 284 { 285 case TYPE_ATM: 286 packet_len = ATM_SNAPLEN; 287 caplen = ATM_SNAPLEN; 288 dp += 4; 289 290 break; 291 292 case TYPE_ETH: 293 swt = SWAPS(header->wlen); 294 packet_len = swt - (p->md.dag_fcs_bits); 295 caplen = erf_record_len - dag_record_size - 2; 296 if (caplen > packet_len) 297 { 298 caplen = packet_len; 299 } 300 dp += 2; 301 302 break; 303 304 case TYPE_HDLC_POS: 305 swt = SWAPS(header->wlen); 306 packet_len = swt - (p->md.dag_fcs_bits); 307 caplen = erf_record_len - dag_record_size; 308 if (caplen > packet_len) 309 { 310 caplen = packet_len; 311 } 312 313 break; 314 } 315 316 if(caplen > p->snapshot) 317 caplen = p->snapshot; 318 319 /* 320 * Has "pcap_breakloop()" been called? 321 * If so, return immediately - if we haven't read any 322 * packets, clear the flag and return -2 to indicate 323 * that we were told to break out of the loop, otherwise 324 * leave the flag set, so that the *next* call will break 325 * out of the loop without having read any packets, and 326 * return the number of packets we've processed so far. 327 */ 328 if (p->break_loop) 329 { 330 if (n == 0) 331 { 332 p->break_loop = 0; 333 return (-2); 334 } 335 else 336 { 337 p->bp = (char*)header; 338 p->cc = endofbuf - (char*)header; 339 return (n); 340 } 341 } 342 343 if(!dfp) 344 { 345 /* convert between timestamp formats */ 346 ts = header->ts; 347 pcap_header.ts.tv_sec = (int)(ts >> 32); 348 ts = (ts & 0xffffffffi64) * 1000000; 349 ts += 0x80000000; /* rounding */ 350 pcap_header.ts.tv_usec = (int)(ts >> 32); 351 if (pcap_header.ts.tv_usec >= 1000000) { 352 pcap_header.ts.tv_usec -= 1000000; 353 pcap_header.ts.tv_sec++; 354 } 355 } 356 357 /* No underlaying filtering system. We need to filter on our own */ 358 if (p->fcode.bf_insns) 359 { 360 if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0) 361 { 362 /* Move to next packet */ 363 header = (dag_record_t*)((char*)header + erf_record_len); 364 continue; 365 } 366 } 367 368 /* Fill the header for the user suppplied callback function */ 369 pcap_header.caplen = caplen; 370 pcap_header.len = packet_len; 371 372 /* Call the callback function */ 373 (*callback)(user, &pcap_header, dp); 374 375 /* Move to next packet */ 376 header = (dag_record_t*)((char*)header + erf_record_len); 377 378 /* Stop if the number of packets requested by user has been reached*/ 379 if (++n >= cnt && cnt > 0) 380 { 381 p->bp = (char*)header; 382 p->cc = endofbuf - (char*)header; 383 return (n); 384 } 385 } 386 while((u_char*)header < endofbuf); 387 388 return 1; 389} 390#endif /* HAVE_DAG_API */ 391 392/* Send a packet to the network */ 393static int 394pcap_inject_win32(pcap_t *p, const void *buf, size_t size){ 395 LPPACKET PacketToSend; 396 397 PacketToSend=PacketAllocatePacket(); 398 399 if (PacketToSend == NULL) 400 { 401 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed"); 402 return -1; 403 } 404 405 PacketInitPacket(PacketToSend,(PVOID)buf,size); 406 if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){ 407 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed"); 408 PacketFreePacket(PacketToSend); 409 return -1; 410 } 411 412 PacketFreePacket(PacketToSend); 413 414 /* 415 * We assume it all got sent if "PacketSendPacket()" succeeded. 416 * "pcap_inject()" is expected to return the number of bytes 417 * sent. 418 */ 419 return size; 420} 421 422static void 423pcap_cleanup_win32(pcap_t *p) 424{ 425 if (p->adapter != NULL) { 426 PacketCloseAdapter(p->adapter); 427 p->adapter = NULL; 428 } 429 if (p->Packet) { 430 PacketFreePacket(p->Packet); 431 p->Packet = NULL; 432 } 433 pcap_cleanup_live_common(p); 434} 435 436static int 437pcap_activate_win32(pcap_t *p) 438{ 439 NetType type; 440 441 if (p->opt.rfmon) { 442 /* 443 * No monitor mode on Windows. It could be done on 444 * Vista with drivers that support the native 802.11 445 * mechanism and monitor mode. 446 */ 447 return (PCAP_ERROR_RFMON_NOTSUP); 448 } 449 450 /* Init WinSock */ 451 wsockinit(); 452 453 p->adapter = PacketOpenAdapter(p->opt.source); 454 455 if (p->adapter == NULL) 456 { 457 /* Adapter detected but we are not able to open it. Return failure. */ 458 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror()); 459 return PCAP_ERROR; 460 } 461 462 /*get network type*/ 463 if(PacketGetNetType (p->adapter,&type) == FALSE) 464 { 465 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror()); 466 goto bad; 467 } 468 469 /*Set the linktype*/ 470 switch (type.LinkType) 471 { 472 case NdisMediumWan: 473 p->linktype = DLT_EN10MB; 474 break; 475 476 case NdisMedium802_3: 477 p->linktype = DLT_EN10MB; 478 /* 479 * This is (presumably) a real Ethernet capture; give it a 480 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so 481 * that an application can let you choose it, in case you're 482 * capturing DOCSIS traffic that a Cisco Cable Modem 483 * Termination System is putting out onto an Ethernet (it 484 * doesn't put an Ethernet header onto the wire, it puts raw 485 * DOCSIS frames out on the wire inside the low-level 486 * Ethernet framing). 487 */ 488 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2); 489 /* 490 * If that fails, just leave the list empty. 491 */ 492 if (p->dlt_list != NULL) { 493 p->dlt_list[0] = DLT_EN10MB; 494 p->dlt_list[1] = DLT_DOCSIS; 495 p->dlt_count = 2; 496 } 497 break; 498 499 case NdisMediumFddi: 500 p->linktype = DLT_FDDI; 501 break; 502 503 case NdisMedium802_5: 504 p->linktype = DLT_IEEE802; 505 break; 506 507 case NdisMediumArcnetRaw: 508 p->linktype = DLT_ARCNET; 509 break; 510 511 case NdisMediumArcnet878_2: 512 p->linktype = DLT_ARCNET; 513 break; 514 515 case NdisMediumAtm: 516 p->linktype = DLT_ATM_RFC1483; 517 break; 518 519 case NdisMediumCHDLC: 520 p->linktype = DLT_CHDLC; 521 break; 522 523 case NdisMediumPPPSerial: 524 p->linktype = DLT_PPP_SERIAL; 525 break; 526 527 case NdisMediumNull: 528 p->linktype = DLT_NULL; 529 break; 530 531 case NdisMediumBare80211: 532 p->linktype = DLT_IEEE802_11; 533 break; 534 535 case NdisMediumRadio80211: 536 p->linktype = DLT_IEEE802_11_RADIO; 537 break; 538 539 case NdisMediumPpi: 540 p->linktype = DLT_PPI; 541 break; 542 543 default: 544 p->linktype = DLT_EN10MB; /*an unknown adapter is assumed to be ethernet*/ 545 break; 546 } 547 548 /* Set promiscuous mode */ 549 if (p->opt.promisc) 550 { 551 552 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE) 553 { 554 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode"); 555 goto bad; 556 } 557 } 558 else 559 { 560 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE) 561 { 562 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode"); 563 goto bad; 564 } 565 } 566 567 /* Set the buffer size */ 568 p->bufsize = WIN32_DEFAULT_USER_BUFFER_SIZE; 569 570 /* allocate Packet structure used during the capture */ 571 if((p->Packet = PacketAllocatePacket())==NULL) 572 { 573 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure"); 574 goto bad; 575 } 576 577 if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD)) 578 { 579 /* 580 * Traditional Adapter 581 */ 582 /* 583 * If the buffer size wasn't explicitly set, default to 584 * WIN32_DEFAULT_USER_BUFFER_SIZE. 585 */ 586 if (p->opt.buffer_size == 0) 587 p->opt.buffer_size = WIN32_DEFAULT_KERNEL_BUFFER_SIZE; 588 589 if(PacketSetBuff(p->adapter,p->opt.buffer_size)==FALSE) 590 { 591 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer"); 592 goto bad; 593 } 594 595 p->buffer = (u_char *)malloc(p->bufsize); 596 if (p->buffer == NULL) 597 { 598 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 599 goto bad; 600 } 601 602 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize); 603 604 /* tell the driver to copy the buffer only if it contains at least 16K */ 605 if(PacketSetMinToCopy(p->adapter,16000)==FALSE) 606 { 607 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror()); 608 goto bad; 609 } 610 } 611 else 612#ifdef HAVE_DAG_API 613 { 614 /* 615 * Dag Card 616 */ 617 LONG status; 618 HKEY dagkey; 619 DWORD lptype; 620 DWORD lpcbdata; 621 int postype = 0; 622 char keyname[512]; 623 624 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s", 625 "SYSTEM\\CurrentControlSet\\Services\\DAG", 626 strstr(_strlwr(p->opt.source), "dag")); 627 do 628 { 629 status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey); 630 if(status != ERROR_SUCCESS) 631 break; 632 633 status = RegQueryValueEx(dagkey, 634 "PosType", 635 NULL, 636 &lptype, 637 (char*)&postype, 638 &lpcbdata); 639 640 if(status != ERROR_SUCCESS) 641 { 642 postype = 0; 643 } 644 645 RegCloseKey(dagkey); 646 } 647 while(FALSE); 648 649 650 p->snapshot = PacketSetSnapLen(p->adapter, snaplen); 651 652 /* Set the length of the FCS associated to any packet. This value 653 * will be subtracted to the packet length */ 654 p->md.dag_fcs_bits = p->adapter->DagFcsLen; 655 } 656#else 657 goto bad; 658#endif /* HAVE_DAG_API */ 659 660 PacketSetReadTimeout(p->adapter, p->md.timeout); 661 662#ifdef HAVE_DAG_API 663 if(p->adapter->Flags & INFO_FLAG_DAG_CARD) 664 { 665 /* install dag specific handlers for read and setfilter */ 666 p->read_op = pcap_read_win32_dag; 667 p->setfilter_op = pcap_setfilter_win32_dag; 668 } 669 else 670 { 671#endif /* HAVE_DAG_API */ 672 /* install traditional npf handlers for read and setfilter */ 673 p->read_op = pcap_read_win32_npf; 674 p->setfilter_op = pcap_setfilter_win32_npf; 675#ifdef HAVE_DAG_API 676 } 677#endif /* HAVE_DAG_API */ 678 p->setdirection_op = NULL; /* Not implemented. */ 679 /* XXX - can this be implemented on some versions of Windows? */ 680 p->inject_op = pcap_inject_win32; 681 p->set_datalink_op = NULL; /* can't change data link type */ 682 p->getnonblock_op = pcap_getnonblock_win32; 683 p->setnonblock_op = pcap_setnonblock_win32; 684 p->stats_op = pcap_stats_win32; 685 p->setbuff_op = pcap_setbuff_win32; 686 p->setmode_op = pcap_setmode_win32; 687 p->setmintocopy_op = pcap_setmintocopy_win32; 688 p->cleanup_op = pcap_cleanup_win32; 689 690 return (0); 691bad: 692 pcap_cleanup_win32(p); 693 return (PCAP_ERROR); 694} 695 696pcap_t * 697pcap_create(const char *device, char *ebuf) 698{ 699 pcap_t *p; 700 701 if (strlen(device) == 1) 702 { 703 /* 704 * It's probably a unicode string 705 * Convert to ascii and pass it to pcap_create_common 706 * 707 * This wonderful hack is needed because pcap_lookupdev still returns 708 * unicode strings, and it's used by windump when no device is specified 709 * in the command line 710 */ 711 size_t length; 712 char* deviceAscii; 713 714 length = wcslen((wchar_t*)device); 715 716 deviceAscii = (char*)malloc(length + 1); 717 718 if (deviceAscii == NULL) 719 { 720 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Malloc failed"); 721 return NULL; 722 } 723 724 snprintf(deviceAscii, length + 1, "%ws", (wchar_t*)device); 725 p = pcap_create_common(deviceAscii, ebuf); 726 free(deviceAscii); 727 } 728 else 729 { 730 p = pcap_create_common(device, ebuf); 731 } 732 733 if (p == NULL) 734 return (NULL); 735 736 p->activate_op = pcap_activate_win32; 737 return (p); 738} 739 740static int 741pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp) 742{ 743 if(PacketSetBpf(p->adapter,fp)==FALSE){ 744 /* 745 * Kernel filter not installed. 746 * XXX - fall back on userland filtering, as is done 747 * on other platforms? 748 */ 749 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror()); 750 return (-1); 751 } 752 753 /* 754 * Discard any previously-received packets, as they might have 755 * passed whatever filter was formerly in effect, but might 756 * not pass this filter (BIOCSETF discards packets buffered 757 * in the kernel, so you can lose packets in any case). 758 */ 759 p->cc = 0; 760 return (0); 761} 762 763/* 764 * We filter at user level, since the kernel driver does't process the packets 765 */ 766static int 767pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) { 768 769 if(!fp) 770 { 771 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf)); 772 return -1; 773 } 774 775 /* Install a user level filter */ 776 if (install_bpf_program(p, fp) < 0) 777 { 778 snprintf(p->errbuf, sizeof(p->errbuf), 779 "setfilter, unable to install the filter: %s", pcap_strerror(errno)); 780 return -1; 781 } 782 783 p->md.use_bpf = 0; 784 785 return (0); 786} 787 788static int 789pcap_getnonblock_win32(pcap_t *p, char *errbuf) 790{ 791 /* 792 * XXX - if there were a PacketGetReadTimeout() call, we 793 * would use it, and return 1 if the timeout is -1 794 * and 0 otherwise. 795 */ 796 return (p->nonblock); 797} 798 799static int 800pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf) 801{ 802 int newtimeout; 803 804 if (nonblock) { 805 /* 806 * Set the read timeout to -1 for non-blocking mode. 807 */ 808 newtimeout = -1; 809 } else { 810 /* 811 * Restore the timeout set when the device was opened. 812 * (Note that this may be -1, in which case we're not 813 * really leaving non-blocking mode.) 814 */ 815 newtimeout = p->md.timeout; 816 } 817 if (!PacketSetReadTimeout(p->adapter, newtimeout)) { 818 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 819 "PacketSetReadTimeout: %s", pcap_win32strerror()); 820 return (-1); 821 } 822 p->nonblock = (newtimeout == -1); 823 return (0); 824} 825 826/*platform-dependent routine to add devices other than NDIS interfaces*/ 827int 828pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf) 829{ 830 return (0); 831} 832