2 * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (c) 2005 - 2008 CACE Technologies, Davis (California)
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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
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.
35 static const char rcsid[] _U_ =
36 "@(#) $Header: /tcpdump/master/libpcap/pcap-win32.c,v 1.42 2008-05-21 22:15:25 gianluca Exp $ (LBL)";
45 #endif /*__MINGW32__*/
49 #endif /* HAVE_DAG_API */
52 #define errno (*_errno())
53 #endif /* __MINGW32__ */
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 *);
60 /*dimension of the buffer in the pcap_t structure*/
61 #define WIN32_DEFAULT_USER_BUFFER_SIZE 256000
63 /*dimension of the buffer in the kernel driver NPF */
64 #define WIN32_DEFAULT_KERNEL_BUFFER_SIZE 1000000
66 /* Equivalent to ntohs(), but a lot faster under Windows */
67 #define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
70 * Header that the WinPcap driver associates to the packets.
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) */
81 CRITICAL_SECTION g_PcapCompileCriticalSection;
89 if (dwReason == DLL_PROCESS_ATTACH)
91 InitializeCriticalSection(&g_PcapCompileCriticalSection);
101 WORD wVersionRequested;
104 wVersionRequested = MAKEWORD( 1, 1);
105 err = WSAStartup( wVersionRequested, &wsaData );
115 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
118 if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
119 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
126 /* Set the dimension of the kernel-level capture buffer */
128 pcap_setbuff_win32(pcap_t *p, int dim)
130 if(PacketSetBuff(p->adapter,dim)==FALSE)
132 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
138 /* Set the driver working mode */
140 pcap_setmode_win32(pcap_t *p, int mode)
142 if(PacketSetMode(p->adapter,mode)==FALSE)
144 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
151 /*set the minimum amount of data that will release a read call*/
153 pcap_setmintocopy_win32(pcap_t *p, int size)
155 if(PacketSetMinToCopy(p->adapter, size)==FALSE)
157 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
164 pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
168 register u_char *bp, *ep;
173 * Has "pcap_breakloop()" been called?
177 * Yes - clear the flag that indicates that it
178 * has, and return -2 to indicate that we were
179 * told to break out of the loop.
185 /* capture the packets */
186 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
187 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
191 cc = p->Packet->ulBytesReceived;
193 bp = p->Packet->Buffer;
199 * Loop through each packet.
201 #define bhp ((struct bpf_hdr *)bp)
204 register int caplen, hdrlen;
207 * Has "pcap_breakloop()" been called?
208 * If so, return immediately - if we haven't read any
209 * packets, clear the flag and return -2 to indicate
210 * that we were told to break out of the loop, otherwise
211 * leave the flag set, so that the *next* call will break
212 * out of the loop without having read any packets, and
213 * return the number of packets we've processed so far.
228 caplen = bhp->bh_caplen;
229 hdrlen = bhp->bh_hdrlen;
232 * XXX A bpf_hdr matches a pcap_pkthdr.
234 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
235 bp += BPF_WORDALIGN(caplen + hdrlen);
236 if (++n >= cnt && cnt > 0) {
249 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
252 int packet_len = 0, caplen = 0;
253 struct pcap_pkthdr pcap_header;
256 dag_record_t *header;
257 unsigned erf_record_len;
261 unsigned dfp = p->adapter->DagFastProcess;
264 if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
266 /* Get new packets from the network */
267 if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){
268 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
272 cc = p->Packet->ulBytesReceived;
274 /* The timeout has expired but we no packets arrived */
276 header = (dag_record_t*)p->adapter->DagBuffer;
279 header = (dag_record_t*)p->bp;
281 endofbuf = (char*)header + cc;
284 * Cycle through the packets
288 erf_record_len = SWAPS(header->rlen);
289 if((char*)header + erf_record_len > endofbuf)
292 /* Increase the number of captured packets */
293 p->md.stat.ps_recv++;
295 /* Find the beginning of the packet */
296 dp = ((u_char *)header) + dag_record_size;
298 /* Determine actual packet len */
302 packet_len = ATM_SNAPLEN;
303 caplen = ATM_SNAPLEN;
309 swt = SWAPS(header->wlen);
310 packet_len = swt - (p->md.dag_fcs_bits);
311 caplen = erf_record_len - dag_record_size - 2;
312 if (caplen > packet_len)
321 swt = SWAPS(header->wlen);
322 packet_len = swt - (p->md.dag_fcs_bits);
323 caplen = erf_record_len - dag_record_size;
324 if (caplen > packet_len)
332 if(caplen > p->snapshot)
333 caplen = p->snapshot;
336 * Has "pcap_breakloop()" been called?
337 * If so, return immediately - if we haven't read any
338 * packets, clear the flag and return -2 to indicate
339 * that we were told to break out of the loop, otherwise
340 * leave the flag set, so that the *next* call will break
341 * out of the loop without having read any packets, and
342 * return the number of packets we've processed so far.
353 p->bp = (char*)header;
354 p->cc = endofbuf - (char*)header;
361 /* convert between timestamp formats */
363 pcap_header.ts.tv_sec = (int)(ts >> 32);
364 ts = (ts & 0xffffffffi64) * 1000000;
365 ts += 0x80000000; /* rounding */
366 pcap_header.ts.tv_usec = (int)(ts >> 32);
367 if (pcap_header.ts.tv_usec >= 1000000) {
368 pcap_header.ts.tv_usec -= 1000000;
369 pcap_header.ts.tv_sec++;
373 /* No underlaying filtering system. We need to filter on our own */
374 if (p->fcode.bf_insns)
376 if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
378 /* Move to next packet */
379 header = (dag_record_t*)((char*)header + erf_record_len);
384 /* Fill the header for the user suppplied callback function */
385 pcap_header.caplen = caplen;
386 pcap_header.len = packet_len;
388 /* Call the callback function */
389 (*callback)(user, &pcap_header, dp);
391 /* Move to next packet */
392 header = (dag_record_t*)((char*)header + erf_record_len);
394 /* Stop if the number of packets requested by user has been reached*/
395 if (++n >= cnt && cnt > 0)
397 p->bp = (char*)header;
398 p->cc = endofbuf - (char*)header;
402 while((u_char*)header < endofbuf);
406 #endif /* HAVE_DAG_API */
408 /* Send a packet to the network */
410 pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
411 LPPACKET PacketToSend;
413 PacketToSend=PacketAllocatePacket();
415 if (PacketToSend == NULL)
417 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
421 PacketInitPacket(PacketToSend,(PVOID)buf,size);
422 if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
423 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
424 PacketFreePacket(PacketToSend);
428 PacketFreePacket(PacketToSend);
431 * We assume it all got sent if "PacketSendPacket()" succeeded.
432 * "pcap_inject()" is expected to return the number of bytes
439 pcap_cleanup_win32(pcap_t *p)
441 if (p->adapter != NULL) {
442 PacketCloseAdapter(p->adapter);
446 PacketFreePacket(p->Packet);
449 pcap_cleanup_live_common(p);
453 pcap_activate_win32(pcap_t *p)
459 * No monitor mode on Windows. It could be done on
460 * Vista with drivers that support the native 802.11
461 * mechanism and monitor mode.
463 return (PCAP_ERROR_RFMON_NOTSUP);
469 p->adapter = PacketOpenAdapter(p->opt.source);
471 if (p->adapter == NULL)
473 /* Adapter detected but we are not able to open it. Return failure. */
474 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
479 if(PacketGetNetType (p->adapter,&type) == FALSE)
481 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
486 switch (type.LinkType)
489 p->linktype = DLT_EN10MB;
492 case NdisMedium802_3:
493 p->linktype = DLT_EN10MB;
495 * This is (presumably) a real Ethernet capture; give it a
496 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
497 * that an application can let you choose it, in case you're
498 * capturing DOCSIS traffic that a Cisco Cable Modem
499 * Termination System is putting out onto an Ethernet (it
500 * doesn't put an Ethernet header onto the wire, it puts raw
501 * DOCSIS frames out on the wire inside the low-level
504 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
506 * If that fails, just leave the list empty.
508 if (p->dlt_list != NULL) {
509 p->dlt_list[0] = DLT_EN10MB;
510 p->dlt_list[1] = DLT_DOCSIS;
516 p->linktype = DLT_FDDI;
519 case NdisMedium802_5:
520 p->linktype = DLT_IEEE802;
523 case NdisMediumArcnetRaw:
524 p->linktype = DLT_ARCNET;
527 case NdisMediumArcnet878_2:
528 p->linktype = DLT_ARCNET;
532 p->linktype = DLT_ATM_RFC1483;
535 case NdisMediumCHDLC:
536 p->linktype = DLT_CHDLC;
539 case NdisMediumPPPSerial:
540 p->linktype = DLT_PPP_SERIAL;
544 p->linktype = DLT_NULL;
547 case NdisMediumBare80211:
548 p->linktype = DLT_IEEE802_11;
551 case NdisMediumRadio80211:
552 p->linktype = DLT_IEEE802_11_RADIO;
556 p->linktype = DLT_PPI;
560 p->linktype = DLT_EN10MB; /*an unknown adapter is assumed to be ethernet*/
564 /* Set promiscuous mode */
568 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
570 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
576 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE)
578 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
583 /* Set the buffer size */
584 p->bufsize = WIN32_DEFAULT_USER_BUFFER_SIZE;
586 /* allocate Packet structure used during the capture */
587 if((p->Packet = PacketAllocatePacket())==NULL)
589 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
593 if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
596 * Traditional Adapter
599 * If the buffer size wasn't explicitly set, default to
600 * WIN32_DEFAULT_USER_BUFFER_SIZE.
602 if (p->opt.buffer_size == 0)
603 p->opt.buffer_size = WIN32_DEFAULT_KERNEL_BUFFER_SIZE;
605 if(PacketSetBuff(p->adapter,p->opt.buffer_size)==FALSE)
607 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
611 p->buffer = (u_char *)malloc(p->bufsize);
612 if (p->buffer == NULL)
614 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
618 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
620 /* tell the driver to copy the buffer only if it contains at least 16K */
621 if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
623 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror());
640 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
641 "SYSTEM\\CurrentControlSet\\Services\\DAG",
642 strstr(_strlwr(p->opt.source), "dag"));
645 status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
646 if(status != ERROR_SUCCESS)
649 status = RegQueryValueEx(dagkey,
656 if(status != ERROR_SUCCESS)
666 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
668 /* Set the length of the FCS associated to any packet. This value
669 * will be subtracted to the packet length */
670 p->md.dag_fcs_bits = p->adapter->DagFcsLen;
674 #endif /* HAVE_DAG_API */
676 PacketSetReadTimeout(p->adapter, p->md.timeout);
679 if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
681 /* install dag specific handlers for read and setfilter */
682 p->read_op = pcap_read_win32_dag;
683 p->setfilter_op = pcap_setfilter_win32_dag;
687 #endif /* HAVE_DAG_API */
688 /* install traditional npf handlers for read and setfilter */
689 p->read_op = pcap_read_win32_npf;
690 p->setfilter_op = pcap_setfilter_win32_npf;
693 #endif /* HAVE_DAG_API */
694 p->setdirection_op = NULL; /* Not implemented. */
695 /* XXX - can this be implemented on some versions of Windows? */
696 p->inject_op = pcap_inject_win32;
697 p->set_datalink_op = NULL; /* can't change data link type */
698 p->getnonblock_op = pcap_getnonblock_win32;
699 p->setnonblock_op = pcap_setnonblock_win32;
700 p->stats_op = pcap_stats_win32;
701 p->setbuff_op = pcap_setbuff_win32;
702 p->setmode_op = pcap_setmode_win32;
703 p->setmintocopy_op = pcap_setmintocopy_win32;
704 p->cleanup_op = pcap_cleanup_win32;
708 pcap_cleanup_win32(p);
713 pcap_create(const char *device, char *ebuf)
717 if (strlen(device) == 1)
720 * It's probably a unicode string
721 * Convert to ascii and pass it to pcap_create_common
723 * This wonderful hack is needed because pcap_lookupdev still returns
724 * unicode strings, and it's used by windump when no device is specified
725 * in the command line
730 length = wcslen((wchar_t*)device);
732 deviceAscii = (char*)malloc(length + 1);
734 if (deviceAscii == NULL)
736 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Malloc failed");
740 snprintf(deviceAscii, length + 1, "%ws", (wchar_t*)device);
741 p = pcap_create_common(deviceAscii, ebuf);
746 p = pcap_create_common(device, ebuf);
752 p->activate_op = pcap_activate_win32;
757 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
759 if(PacketSetBpf(p->adapter,fp)==FALSE){
761 * Kernel filter not installed.
762 * XXX - fall back on userland filtering, as is done
763 * on other platforms?
765 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
770 * Discard any previously-received packets, as they might have
771 * passed whatever filter was formerly in effect, but might
772 * not pass this filter (BIOCSETF discards packets buffered
773 * in the kernel, so you can lose packets in any case).
780 * We filter at user level, since the kernel driver does't process the packets
783 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
787 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
791 /* Install a user level filter */
792 if (install_bpf_program(p, fp) < 0)
794 snprintf(p->errbuf, sizeof(p->errbuf),
795 "setfilter, unable to install the filter: %s", pcap_strerror(errno));
805 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
808 * XXX - if there were a PacketGetReadTimeout() call, we
809 * would use it, and return 1 if the timeout is -1
812 return (p->nonblock);
816 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
822 * Set the read timeout to -1 for non-blocking mode.
827 * Restore the timeout set when the device was opened.
828 * (Note that this may be -1, in which case we're not
829 * really leaving non-blocking mode.)
831 newtimeout = p->md.timeout;
833 if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
834 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
835 "PacketSetReadTimeout: %s", pcap_win32strerror());
838 p->nonblock = (newtimeout == -1);
842 /*platform-dependent routine to add devices other than NDIS interfaces*/
844 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)