1 /*
2 * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (c) 2005 - 2008 CACE Technologies, Davis (California)
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the Politecnico di Torino, CACE Technologies
16 * nor the names of its contributors may be used to endorse or promote
17 * products derived from this software without specific prior written
18 * permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 *
32 */
33
34 #include <pcap-int.h>
35 #include <Packet32.h>
36 #ifdef __MINGW32__
37 #ifdef __MINGW64__
38 #include <ntddndis.h>
39 #else /*__MINGW64__*/
40 #include <ddk/ntddndis.h>
41 #include <ddk/ndis.h>
42 #endif /*__MINGW64__*/
43 #else /*__MINGW32__*/
44 #include <ntddndis.h>
45 #endif /*__MINGW32__*/
46 #ifdef HAVE_DAG_API
47 #include <dagnew.h>
48 #include <dagapi.h>
49 #endif /* HAVE_DAG_API */
50 #ifdef __MINGW32__
51 int* _errno();
52 #define errno (*_errno())
53 #endif /* __MINGW32__ */
54
55 static int pcap_setfilter_win32_npf(pcap_t *, struct bpf_program *);
56 static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *);
57 static int pcap_getnonblock_win32(pcap_t *, char *);
58 static int pcap_setnonblock_win32(pcap_t *, int, char *);
59
60 /*dimension of the buffer in the pcap_t structure*/
61 #define WIN32_DEFAULT_USER_BUFFER_SIZE 256000
62
63 /*dimension of the buffer in the kernel driver NPF */
64 #define WIN32_DEFAULT_KERNEL_BUFFER_SIZE 1000000
65
66 /* Equivalent to ntohs(), but a lot faster under Windows */
67 #define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
68
69 /*
70 * Private data for capturing on WinPcap devices.
71 */
72 struct pcap_win {
73 int nonblock;
74
75 int filtering_in_kernel; /* using kernel filter */
76
77 #ifdef HAVE_DAG_API
78 int dag_fcs_bits; /* Number of checksum bits from link layer */
79 #endif
80 };
81
82 /*
83 * Header that the WinPcap driver associates to the packets.
84 * Once was in bpf.h
85 */
86 struct bpf_hdr {
87 struct timeval bh_tstamp; /* time stamp */
88 bpf_u_int32 bh_caplen; /* length of captured portion */
89 bpf_u_int32 bh_datalen; /* original length of packet */
90 u_short bh_hdrlen; /* length of bpf header (this struct
91 plus alignment padding) */
92 };
93
94 CRITICAL_SECTION g_PcapCompileCriticalSection;
95
DllMain(HANDLE hinstDLL,DWORD dwReason,LPVOID lpvReserved)96 BOOL WINAPI DllMain(
97 HANDLE hinstDLL,
98 DWORD dwReason,
99 LPVOID lpvReserved
100 )
101 {
102 if (dwReason == DLL_PROCESS_ATTACH)
103 {
104 InitializeCriticalSection(&g_PcapCompileCriticalSection);
105 }
106
107 return TRUE;
108 }
109
110 /* Start winsock */
111 int
wsockinit()112 wsockinit()
113 {
114 WORD wVersionRequested;
115 WSADATA wsaData;
116 static int err = -1;
117 static int done = 0;
118
119 if (done)
120 return err;
121
122 wVersionRequested = MAKEWORD( 1, 1);
123 err = WSAStartup( wVersionRequested, &wsaData );
124 atexit ((void(*)(void))WSACleanup);
125 InitializeCriticalSection(&g_PcapCompileCriticalSection);
126 done = 1;
127
128 if ( err != 0 )
129 err = -1;
130 return err;
131 }
132
pcap_wsockinit()133 int pcap_wsockinit()
134 {
135 return wsockinit();
136 }
137
138 static int
pcap_stats_win32(pcap_t * p,struct pcap_stat * ps)139 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
140 {
141
142 if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
143 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
144 return -1;
145 }
146
147 return 0;
148 }
149
150 /* Set the dimension of the kernel-level capture buffer */
151 static int
pcap_setbuff_win32(pcap_t * p,int dim)152 pcap_setbuff_win32(pcap_t *p, int dim)
153 {
154 if(PacketSetBuff(p->adapter,dim)==FALSE)
155 {
156 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
157 return -1;
158 }
159 return 0;
160 }
161
162 /* Set the driver working mode */
163 static int
pcap_setmode_win32(pcap_t * p,int mode)164 pcap_setmode_win32(pcap_t *p, int mode)
165 {
166 if(PacketSetMode(p->adapter,mode)==FALSE)
167 {
168 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
169 return -1;
170 }
171
172 return 0;
173 }
174
175 /*set the minimum amount of data that will release a read call*/
176 static int
pcap_setmintocopy_win32(pcap_t * p,int size)177 pcap_setmintocopy_win32(pcap_t *p, int size)
178 {
179 if(PacketSetMinToCopy(p->adapter, size)==FALSE)
180 {
181 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
182 return -1;
183 }
184 return 0;
185 }
186
187 /*return the Adapter for a pcap_t*/
188 static Adapter *
pcap_getadapter_win32(pcap_t * p)189 pcap_getadapter_win32(pcap_t *p)
190 {
191 return p->adapter;
192 }
193
194 static int
pcap_read_win32_npf(pcap_t * p,int cnt,pcap_handler callback,u_char * user)195 pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
196 {
197 int cc;
198 int n = 0;
199 register u_char *bp, *ep;
200 u_char *datap;
201 struct pcap_win *pw = p->priv;
202
203 cc = p->cc;
204 if (p->cc == 0) {
205 /*
206 * Has "pcap_breakloop()" been called?
207 */
208 if (p->break_loop) {
209 /*
210 * Yes - clear the flag that indicates that it
211 * has, and return PCAP_ERROR_BREAK to indicate
212 * that we were told to break out of the loop.
213 */
214 p->break_loop = 0;
215 return (PCAP_ERROR_BREAK);
216 }
217
218 /* capture the packets */
219 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
220 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
221 return (PCAP_ERROR);
222 }
223
224 cc = p->Packet->ulBytesReceived;
225
226 bp = p->Packet->Buffer;
227 }
228 else
229 bp = p->bp;
230
231 /*
232 * Loop through each packet.
233 */
234 #define bhp ((struct bpf_hdr *)bp)
235 ep = bp + cc;
236 while (1) {
237 register int caplen, hdrlen;
238
239 /*
240 * Has "pcap_breakloop()" been called?
241 * If so, return immediately - if we haven't read any
242 * packets, clear the flag and return PCAP_ERROR_BREAK
243 * to indicate that we were told to break out of the loop,
244 * otherwise leave the flag set, so that the *next* call
245 * will break out of the loop without having read any
246 * packets, and return the number of packets we've
247 * processed so far.
248 */
249 if (p->break_loop) {
250 if (n == 0) {
251 p->break_loop = 0;
252 return (PCAP_ERROR_BREAK);
253 } else {
254 p->bp = bp;
255 p->cc = ep - bp;
256 return (n);
257 }
258 }
259 if (bp >= ep)
260 break;
261
262 caplen = bhp->bh_caplen;
263 hdrlen = bhp->bh_hdrlen;
264 datap = bp + hdrlen;
265
266 /*
267 * Short-circuit evaluation: if using BPF filter
268 * in kernel, no need to do it now - we already know
269 * the packet passed the filter.
270 *
271 * XXX - bpf_filter() should always return TRUE if
272 * handed a null pointer for the program, but it might
273 * just try to "run" the filter, so we check here.
274 */
275 if (pw->filtering_in_kernel ||
276 p->fcode.bf_insns == NULL ||
277 bpf_filter(p->fcode.bf_insns, datap, bhp->bh_datalen, caplen)) {
278 /*
279 * XXX A bpf_hdr matches a pcap_pkthdr.
280 */
281 (*callback)(user, (struct pcap_pkthdr*)bp, datap);
282 bp += Packet_WORDALIGN(caplen + hdrlen);
283 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
284 p->bp = bp;
285 p->cc = ep - bp;
286 return (n);
287 }
288 } else {
289 /*
290 * Skip this packet.
291 */
292 bp += Packet_WORDALIGN(caplen + hdrlen);
293 }
294 }
295 #undef bhp
296 p->cc = 0;
297 return (n);
298 }
299
300 #ifdef HAVE_DAG_API
301 static int
pcap_read_win32_dag(pcap_t * p,int cnt,pcap_handler callback,u_char * user)302 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
303 {
304 struct pcap_win *pw = p->priv;
305 u_char *dp = NULL;
306 int packet_len = 0, caplen = 0;
307 struct pcap_pkthdr pcap_header;
308 u_char *endofbuf;
309 int n = 0;
310 dag_record_t *header;
311 unsigned erf_record_len;
312 ULONGLONG ts;
313 int cc;
314 unsigned swt;
315 unsigned dfp = p->adapter->DagFastProcess;
316
317 cc = p->cc;
318 if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
319 {
320 /* Get new packets from the network */
321 if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){
322 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
323 return (-1);
324 }
325
326 cc = p->Packet->ulBytesReceived;
327 if(cc == 0)
328 /* The timeout has expired but we no packets arrived */
329 return 0;
330 header = (dag_record_t*)p->adapter->DagBuffer;
331 }
332 else
333 header = (dag_record_t*)p->bp;
334
335 endofbuf = (char*)header + cc;
336
337 /*
338 * Cycle through the packets
339 */
340 do
341 {
342 erf_record_len = SWAPS(header->rlen);
343 if((char*)header + erf_record_len > endofbuf)
344 break;
345
346 /* Increase the number of captured packets */
347 pw->stat.ps_recv++;
348
349 /* Find the beginning of the packet */
350 dp = ((u_char *)header) + dag_record_size;
351
352 /* Determine actual packet len */
353 switch(header->type)
354 {
355 case TYPE_ATM:
356 packet_len = ATM_SNAPLEN;
357 caplen = ATM_SNAPLEN;
358 dp += 4;
359
360 break;
361
362 case TYPE_ETH:
363 swt = SWAPS(header->wlen);
364 packet_len = swt - (pw->dag_fcs_bits);
365 caplen = erf_record_len - dag_record_size - 2;
366 if (caplen > packet_len)
367 {
368 caplen = packet_len;
369 }
370 dp += 2;
371
372 break;
373
374 case TYPE_HDLC_POS:
375 swt = SWAPS(header->wlen);
376 packet_len = swt - (pw->dag_fcs_bits);
377 caplen = erf_record_len - dag_record_size;
378 if (caplen > packet_len)
379 {
380 caplen = packet_len;
381 }
382
383 break;
384 }
385
386 if(caplen > p->snapshot)
387 caplen = p->snapshot;
388
389 /*
390 * Has "pcap_breakloop()" been called?
391 * If so, return immediately - if we haven't read any
392 * packets, clear the flag and return -2 to indicate
393 * that we were told to break out of the loop, otherwise
394 * leave the flag set, so that the *next* call will break
395 * out of the loop without having read any packets, and
396 * return the number of packets we've processed so far.
397 */
398 if (p->break_loop)
399 {
400 if (n == 0)
401 {
402 p->break_loop = 0;
403 return (-2);
404 }
405 else
406 {
407 p->bp = (char*)header;
408 p->cc = endofbuf - (char*)header;
409 return (n);
410 }
411 }
412
413 if(!dfp)
414 {
415 /* convert between timestamp formats */
416 ts = header->ts;
417 pcap_header.ts.tv_sec = (int)(ts >> 32);
418 ts = (ts & 0xffffffffi64) * 1000000;
419 ts += 0x80000000; /* rounding */
420 pcap_header.ts.tv_usec = (int)(ts >> 32);
421 if (pcap_header.ts.tv_usec >= 1000000) {
422 pcap_header.ts.tv_usec -= 1000000;
423 pcap_header.ts.tv_sec++;
424 }
425 }
426
427 /* No underlaying filtering system. We need to filter on our own */
428 if (p->fcode.bf_insns)
429 {
430 if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
431 {
432 /* Move to next packet */
433 header = (dag_record_t*)((char*)header + erf_record_len);
434 continue;
435 }
436 }
437
438 /* Fill the header for the user suppplied callback function */
439 pcap_header.caplen = caplen;
440 pcap_header.len = packet_len;
441
442 /* Call the callback function */
443 (*callback)(user, &pcap_header, dp);
444
445 /* Move to next packet */
446 header = (dag_record_t*)((char*)header + erf_record_len);
447
448 /* Stop if the number of packets requested by user has been reached*/
449 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
450 {
451 p->bp = (char*)header;
452 p->cc = endofbuf - (char*)header;
453 return (n);
454 }
455 }
456 while((u_char*)header < endofbuf);
457
458 return 1;
459 }
460 #endif /* HAVE_DAG_API */
461
462 /* Send a packet to the network */
463 static int
pcap_inject_win32(pcap_t * p,const void * buf,size_t size)464 pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
465 LPPACKET PacketToSend;
466
467 PacketToSend=PacketAllocatePacket();
468
469 if (PacketToSend == NULL)
470 {
471 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
472 return -1;
473 }
474
475 PacketInitPacket(PacketToSend,(PVOID)buf,size);
476 if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
477 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
478 PacketFreePacket(PacketToSend);
479 return -1;
480 }
481
482 PacketFreePacket(PacketToSend);
483
484 /*
485 * We assume it all got sent if "PacketSendPacket()" succeeded.
486 * "pcap_inject()" is expected to return the number of bytes
487 * sent.
488 */
489 return size;
490 }
491
492 static void
pcap_cleanup_win32(pcap_t * p)493 pcap_cleanup_win32(pcap_t *p)
494 {
495 if (p->adapter != NULL) {
496 PacketCloseAdapter(p->adapter);
497 p->adapter = NULL;
498 }
499 if (p->Packet) {
500 PacketFreePacket(p->Packet);
501 p->Packet = NULL;
502 }
503 pcap_cleanup_live_common(p);
504 }
505
506 static int
pcap_activate_win32(pcap_t * p)507 pcap_activate_win32(pcap_t *p)
508 {
509 struct pcap_win *pw = p->priv;
510 NetType type;
511
512 if (p->opt.rfmon) {
513 /*
514 * No monitor mode on Windows. It could be done on
515 * Vista with drivers that support the native 802.11
516 * mechanism and monitor mode.
517 */
518 return (PCAP_ERROR_RFMON_NOTSUP);
519 }
520
521 /* Init WinSock */
522 wsockinit();
523
524 p->adapter = PacketOpenAdapter(p->opt.source);
525
526 if (p->adapter == NULL)
527 {
528 /* Adapter detected but we are not able to open it. Return failure. */
529 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
530 return PCAP_ERROR;
531 }
532
533 /*get network type*/
534 if(PacketGetNetType (p->adapter,&type) == FALSE)
535 {
536 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
537 goto bad;
538 }
539
540 /*Set the linktype*/
541 switch (type.LinkType)
542 {
543 case NdisMediumWan:
544 p->linktype = DLT_EN10MB;
545 break;
546
547 case NdisMedium802_3:
548 p->linktype = DLT_EN10MB;
549 /*
550 * This is (presumably) a real Ethernet capture; give it a
551 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
552 * that an application can let you choose it, in case you're
553 * capturing DOCSIS traffic that a Cisco Cable Modem
554 * Termination System is putting out onto an Ethernet (it
555 * doesn't put an Ethernet header onto the wire, it puts raw
556 * DOCSIS frames out on the wire inside the low-level
557 * Ethernet framing).
558 */
559 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
560 /*
561 * If that fails, just leave the list empty.
562 */
563 if (p->dlt_list != NULL) {
564 p->dlt_list[0] = DLT_EN10MB;
565 p->dlt_list[1] = DLT_DOCSIS;
566 p->dlt_count = 2;
567 }
568 break;
569
570 case NdisMediumFddi:
571 p->linktype = DLT_FDDI;
572 break;
573
574 case NdisMedium802_5:
575 p->linktype = DLT_IEEE802;
576 break;
577
578 case NdisMediumArcnetRaw:
579 p->linktype = DLT_ARCNET;
580 break;
581
582 case NdisMediumArcnet878_2:
583 p->linktype = DLT_ARCNET;
584 break;
585
586 case NdisMediumAtm:
587 p->linktype = DLT_ATM_RFC1483;
588 break;
589
590 case NdisMediumCHDLC:
591 p->linktype = DLT_CHDLC;
592 break;
593
594 case NdisMediumPPPSerial:
595 p->linktype = DLT_PPP_SERIAL;
596 break;
597
598 case NdisMediumNull:
599 p->linktype = DLT_NULL;
600 break;
601
602 case NdisMediumBare80211:
603 p->linktype = DLT_IEEE802_11;
604 break;
605
606 case NdisMediumRadio80211:
607 p->linktype = DLT_IEEE802_11_RADIO;
608 break;
609
610 case NdisMediumPpi:
611 p->linktype = DLT_PPI;
612 break;
613
614 default:
615 p->linktype = DLT_EN10MB; /*an unknown adapter is assumed to be ethernet*/
616 break;
617 }
618
619 /* Set promiscuous mode */
620 if (p->opt.promisc)
621 {
622
623 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
624 {
625 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
626 goto bad;
627 }
628 }
629 else
630 {
631 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE)
632 {
633 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
634 goto bad;
635 }
636 }
637
638 /* Set the buffer size */
639 p->bufsize = WIN32_DEFAULT_USER_BUFFER_SIZE;
640
641 /* allocate Packet structure used during the capture */
642 if((p->Packet = PacketAllocatePacket())==NULL)
643 {
644 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
645 goto bad;
646 }
647
648 if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
649 {
650 /*
651 * Traditional Adapter
652 */
653 /*
654 * If the buffer size wasn't explicitly set, default to
655 * WIN32_DEFAULT_USER_BUFFER_SIZE.
656 */
657 if (p->opt.buffer_size == 0)
658 p->opt.buffer_size = WIN32_DEFAULT_KERNEL_BUFFER_SIZE;
659
660 if(PacketSetBuff(p->adapter,p->opt.buffer_size)==FALSE)
661 {
662 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
663 goto bad;
664 }
665
666 p->buffer = (u_char *)malloc(p->bufsize);
667 if (p->buffer == NULL)
668 {
669 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
670 goto bad;
671 }
672
673 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
674
675 if (p->opt.immediate)
676 {
677 /* tell the driver to copy the buffer as soon as data arrives */
678 if(PacketSetMinToCopy(p->adapter,0)==FALSE)
679 {
680 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror());
681 goto bad;
682 }
683 }
684 else
685 {
686 /* tell the driver to copy the buffer only if it contains at least 16K */
687 if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
688 {
689 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror());
690 goto bad;
691 }
692 }
693 }
694 else
695 #ifdef HAVE_DAG_API
696 {
697 /*
698 * Dag Card
699 */
700 LONG status;
701 HKEY dagkey;
702 DWORD lptype;
703 DWORD lpcbdata;
704 int postype = 0;
705 char keyname[512];
706
707 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
708 "SYSTEM\\CurrentControlSet\\Services\\DAG",
709 strstr(_strlwr(p->opt.source), "dag"));
710 do
711 {
712 status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
713 if(status != ERROR_SUCCESS)
714 break;
715
716 status = RegQueryValueEx(dagkey,
717 "PosType",
718 NULL,
719 &lptype,
720 (char*)&postype,
721 &lpcbdata);
722
723 if(status != ERROR_SUCCESS)
724 {
725 postype = 0;
726 }
727
728 RegCloseKey(dagkey);
729 }
730 while(FALSE);
731
732
733 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
734
735 /* Set the length of the FCS associated to any packet. This value
736 * will be subtracted to the packet length */
737 pw->dag_fcs_bits = p->adapter->DagFcsLen;
738 }
739 #else
740 goto bad;
741 #endif /* HAVE_DAG_API */
742
743 PacketSetReadTimeout(p->adapter, p->opt.timeout);
744
745 #ifdef HAVE_DAG_API
746 if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
747 {
748 /* install dag specific handlers for read and setfilter */
749 p->read_op = pcap_read_win32_dag;
750 p->setfilter_op = pcap_setfilter_win32_dag;
751 }
752 else
753 {
754 #endif /* HAVE_DAG_API */
755 /* install traditional npf handlers for read and setfilter */
756 p->read_op = pcap_read_win32_npf;
757 p->setfilter_op = pcap_setfilter_win32_npf;
758 #ifdef HAVE_DAG_API
759 }
760 #endif /* HAVE_DAG_API */
761 p->setdirection_op = NULL; /* Not implemented. */
762 /* XXX - can this be implemented on some versions of Windows? */
763 p->inject_op = pcap_inject_win32;
764 p->set_datalink_op = NULL; /* can't change data link type */
765 p->getnonblock_op = pcap_getnonblock_win32;
766 p->setnonblock_op = pcap_setnonblock_win32;
767 p->stats_op = pcap_stats_win32;
768 p->setbuff_op = pcap_setbuff_win32;
769 p->setmode_op = pcap_setmode_win32;
770 p->setmintocopy_op = pcap_setmintocopy_win32;
771 p->getadapter_op = pcap_getadapter_win32;
772 p->cleanup_op = pcap_cleanup_win32;
773
774 return (0);
775 bad:
776 pcap_cleanup_win32(p);
777 return (PCAP_ERROR);
778 }
779
780 pcap_t *
pcap_create_interface(const char * device,char * ebuf)781 pcap_create_interface(const char *device, char *ebuf)
782 {
783 pcap_t *p;
784
785 if (strlen(device) == 1)
786 {
787 /*
788 * It's probably a unicode string
789 * Convert to ascii and pass it to pcap_create_common
790 *
791 * This wonderful hack is needed because pcap_lookupdev still returns
792 * unicode strings, and it's used by windump when no device is specified
793 * in the command line
794 */
795 size_t length;
796 char* deviceAscii;
797
798 length = wcslen((wchar_t*)device);
799
800 deviceAscii = (char*)malloc(length + 1);
801
802 if (deviceAscii == NULL)
803 {
804 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Malloc failed");
805 return NULL;
806 }
807
808 snprintf(deviceAscii, length + 1, "%ws", (wchar_t*)device);
809 p = pcap_create_common(deviceAscii, ebuf, sizeof (struct pcap_win));
810 free(deviceAscii);
811 }
812 else
813 {
814 p = pcap_create_common(device, ebuf, sizeof (struct pcap_win));
815 }
816
817 if (p == NULL)
818 return (NULL);
819
820 p->activate_op = pcap_activate_win32;
821 return (p);
822 }
823
824 static int
pcap_setfilter_win32_npf(pcap_t * p,struct bpf_program * fp)825 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
826 {
827 struct pcap_win *pw = p->priv;
828
829 if(PacketSetBpf(p->adapter,fp)==FALSE){
830 /*
831 * Kernel filter not installed.
832 *
833 * XXX - we don't know whether this failed because:
834 *
835 * the kernel rejected the filter program as invalid,
836 * in which case we should fall back on userland
837 * filtering;
838 *
839 * the kernel rejected the filter program as too big,
840 * in which case we should again fall back on
841 * userland filtering;
842 *
843 * there was some other problem, in which case we
844 * should probably report an error.
845 *
846 * For NPF devices, the Win32 status will be
847 * STATUS_INVALID_DEVICE_REQUEST for invalid
848 * filters, but I don't know what it'd be for
849 * other problems, and for some other devices
850 * it might not be set at all.
851 *
852 * So we just fall back on userland filtering in
853 * all cases.
854 */
855
856 /*
857 * install_bpf_program() validates the program.
858 *
859 * XXX - what if we already have a filter in the kernel?
860 */
861 if (install_bpf_program(p, fp) < 0)
862 return (-1);
863 pw->filtering_in_kernel = 0; /* filtering in userland */
864 return (0);
865 }
866
867 /*
868 * It worked.
869 */
870 pw->filtering_in_kernel = 1; /* filtering in the kernel */
871
872 /*
873 * Discard any previously-received packets, as they might have
874 * passed whatever filter was formerly in effect, but might
875 * not pass this filter (BIOCSETF discards packets buffered
876 * in the kernel, so you can lose packets in any case).
877 */
878 p->cc = 0;
879 return (0);
880 }
881
882 /*
883 * We filter at user level, since the kernel driver does't process the packets
884 */
885 static int
pcap_setfilter_win32_dag(pcap_t * p,struct bpf_program * fp)886 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
887
888 if(!fp)
889 {
890 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
891 return -1;
892 }
893
894 /* Install a user level filter */
895 if (install_bpf_program(p, fp) < 0)
896 {
897 snprintf(p->errbuf, sizeof(p->errbuf),
898 "setfilter, unable to install the filter: %s", pcap_strerror(errno));
899 return -1;
900 }
901
902 return (0);
903 }
904
905 static int
pcap_getnonblock_win32(pcap_t * p,char * errbuf)906 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
907 {
908 struct pcap_win *pw = p->priv;
909
910 /*
911 * XXX - if there were a PacketGetReadTimeout() call, we
912 * would use it, and return 1 if the timeout is -1
913 * and 0 otherwise.
914 */
915 return (pw->nonblock);
916 }
917
918 static int
pcap_setnonblock_win32(pcap_t * p,int nonblock,char * errbuf)919 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
920 {
921 struct pcap_win *pw = p->priv;
922 int newtimeout;
923
924 if (nonblock) {
925 /*
926 * Set the read timeout to -1 for non-blocking mode.
927 */
928 newtimeout = -1;
929 } else {
930 /*
931 * Restore the timeout set when the device was opened.
932 * (Note that this may be -1, in which case we're not
933 * really leaving non-blocking mode.)
934 */
935 newtimeout = p->opt.timeout;
936 }
937 if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
938 snprintf(errbuf, PCAP_ERRBUF_SIZE,
939 "PacketSetReadTimeout: %s", pcap_win32strerror());
940 return (-1);
941 }
942 pw->nonblock = (newtimeout == -1);
943 return (0);
944 }
945
946 /*platform-dependent routine to add devices other than NDIS interfaces*/
947 int
pcap_platform_finddevs(pcap_if_t ** alldevsp,char * errbuf)948 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
949 {
950 return (0);
951 }
952