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 1.34.2.8 2008-05-21 22:11:26 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) */
85 WORD wVersionRequested;
88 wVersionRequested = MAKEWORD( 1, 1);
89 err = WSAStartup( wVersionRequested, &wsaData );
99 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
102 if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
103 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
110 /* Set the dimension of the kernel-level capture buffer */
112 pcap_setbuff_win32(pcap_t *p, int dim)
114 if(PacketSetBuff(p->adapter,dim)==FALSE)
116 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
122 /* Set the driver working mode */
124 pcap_setmode_win32(pcap_t *p, int mode)
126 if(PacketSetMode(p->adapter,mode)==FALSE)
128 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
135 /*set the minimum amount of data that will release a read call*/
137 pcap_setmintocopy_win32(pcap_t *p, int size)
139 if(PacketSetMinToCopy(p->adapter, size)==FALSE)
141 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
148 pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
152 register u_char *bp, *ep;
157 * Has "pcap_breakloop()" been called?
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.
169 /* capture the packets */
170 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
171 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
175 cc = p->Packet->ulBytesReceived;
177 bp = p->Packet->Buffer;
183 * Loop through each packet.
185 #define bhp ((struct bpf_hdr *)bp)
188 register int caplen, hdrlen;
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.
212 caplen = bhp->bh_caplen;
213 hdrlen = bhp->bh_hdrlen;
216 * XXX A bpf_hdr matches a pcap_pkthdr.
218 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
219 bp += BPF_WORDALIGN(caplen + hdrlen);
220 if (++n >= cnt && cnt > 0) {
233 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
236 int packet_len = 0, caplen = 0;
237 struct pcap_pkthdr pcap_header;
240 dag_record_t *header;
241 unsigned erf_record_len;
245 unsigned dfp = p->adapter->DagFastProcess;
248 if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
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");
256 cc = p->Packet->ulBytesReceived;
258 /* The timeout has expired but we no packets arrived */
260 header = (dag_record_t*)p->adapter->DagBuffer;
263 header = (dag_record_t*)p->bp;
265 endofbuf = (char*)header + cc;
268 * Cycle through the packets
272 erf_record_len = SWAPS(header->rlen);
273 if((char*)header + erf_record_len > endofbuf)
276 /* Increase the number of captured packets */
277 p->md.stat.ps_recv++;
279 /* Find the beginning of the packet */
280 dp = ((u_char *)header) + dag_record_size;
282 /* Determine actual packet len */
286 packet_len = ATM_SNAPLEN;
287 caplen = ATM_SNAPLEN;
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)
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)
316 if(caplen > p->snapshot)
317 caplen = p->snapshot;
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.
337 p->bp = (char*)header;
338 p->cc = endofbuf - (char*)header;
345 /* convert between timestamp formats */
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++;
357 /* No underlaying filtering system. We need to filter on our own */
358 if (p->fcode.bf_insns)
360 if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
362 /* Move to next packet */
363 header = (dag_record_t*)((char*)header + erf_record_len);
368 /* Fill the header for the user suppplied callback function */
369 pcap_header.caplen = caplen;
370 pcap_header.len = packet_len;
372 /* Call the callback function */
373 (*callback)(user, &pcap_header, dp);
375 /* Move to next packet */
376 header = (dag_record_t*)((char*)header + erf_record_len);
378 /* Stop if the number of packets requested by user has been reached*/
379 if (++n >= cnt && cnt > 0)
381 p->bp = (char*)header;
382 p->cc = endofbuf - (char*)header;
386 while((u_char*)header < endofbuf);
390 #endif /* HAVE_DAG_API */
392 /* Send a packet to the network */
394 pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
395 LPPACKET PacketToSend;
397 PacketToSend=PacketAllocatePacket();
399 if (PacketToSend == NULL)
401 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
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);
412 PacketFreePacket(PacketToSend);
415 * We assume it all got sent if "PacketSendPacket()" succeeded.
416 * "pcap_inject()" is expected to return the number of bytes
423 pcap_cleanup_win32(pcap_t *p)
425 if (p->adapter != NULL) {
426 PacketCloseAdapter(p->adapter);
430 PacketFreePacket(p->Packet);
433 pcap_cleanup_live_common(p);
437 pcap_activate_win32(pcap_t *p)
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.
447 return (PCAP_ERROR_RFMON_NOTSUP);
453 p->adapter = PacketOpenAdapter(p->opt.source);
455 if (p->adapter == NULL)
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());
463 if(PacketGetNetType (p->adapter,&type) == FALSE)
465 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
470 switch (type.LinkType)
473 p->linktype = DLT_EN10MB;
476 case NdisMedium802_3:
477 p->linktype = DLT_EN10MB;
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
488 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
490 * If that fails, just leave the list empty.
492 if (p->dlt_list != NULL) {
493 p->dlt_list[0] = DLT_EN10MB;
494 p->dlt_list[1] = DLT_DOCSIS;
500 p->linktype = DLT_FDDI;
503 case NdisMedium802_5:
504 p->linktype = DLT_IEEE802;
507 case NdisMediumArcnetRaw:
508 p->linktype = DLT_ARCNET;
511 case NdisMediumArcnet878_2:
512 p->linktype = DLT_ARCNET;
516 p->linktype = DLT_ATM_RFC1483;
519 case NdisMediumCHDLC:
520 p->linktype = DLT_CHDLC;
523 case NdisMediumPPPSerial:
524 p->linktype = DLT_PPP_SERIAL;
528 p->linktype = DLT_NULL;
531 case NdisMediumBare80211:
532 p->linktype = DLT_IEEE802_11;
535 case NdisMediumRadio80211:
536 p->linktype = DLT_IEEE802_11_RADIO;
540 p->linktype = DLT_PPI;
544 p->linktype = DLT_EN10MB; /*an unknown adapter is assumed to be ethernet*/
548 /* Set promiscuous mode */
552 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
554 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
560 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE)
562 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
567 /* Set the buffer size */
568 p->bufsize = WIN32_DEFAULT_USER_BUFFER_SIZE;
570 /* allocate Packet structure used during the capture */
571 if((p->Packet = PacketAllocatePacket())==NULL)
573 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
577 if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
580 * Traditional Adapter
583 * If the buffer size wasn't explicitly set, default to
584 * WIN32_DEFAULT_USER_BUFFER_SIZE.
586 if (p->opt.buffer_size == 0)
587 p->opt.buffer_size = WIN32_DEFAULT_KERNEL_BUFFER_SIZE;
589 if(PacketSetBuff(p->adapter,p->opt.buffer_size)==FALSE)
591 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
595 p->buffer = (u_char *)malloc(p->bufsize);
596 if (p->buffer == NULL)
598 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
602 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
604 /* tell the driver to copy the buffer only if it contains at least 16K */
605 if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
607 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror());
624 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
625 "SYSTEM\\CurrentControlSet\\Services\\DAG",
626 strstr(_strlwr(p->opt.source), "dag"));
629 status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
630 if(status != ERROR_SUCCESS)
633 status = RegQueryValueEx(dagkey,
640 if(status != ERROR_SUCCESS)
650 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
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;
658 #endif /* HAVE_DAG_API */
660 PacketSetReadTimeout(p->adapter, p->md.timeout);
663 if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
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;
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;
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;
692 pcap_cleanup_win32(p);
697 pcap_create(const char *device, char *ebuf)
701 if (strlen(device) == 1)
704 * It's probably a unicode string
705 * Convert to ascii and pass it to pcap_create_common
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
714 length = wcslen((wchar_t*)device);
716 deviceAscii = (char*)malloc(length + 1);
718 if (deviceAscii == NULL)
720 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Malloc failed");
724 snprintf(deviceAscii, length + 1, "%ws", (wchar_t*)device);
725 p = pcap_create_common(deviceAscii, ebuf);
730 p = pcap_create_common(device, ebuf);
736 p->activate_op = pcap_activate_win32;
741 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
743 if(PacketSetBpf(p->adapter,fp)==FALSE){
745 * Kernel filter not installed.
746 * XXX - fall back on userland filtering, as is done
747 * on other platforms?
749 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
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).
764 * We filter at user level, since the kernel driver does't process the packets
767 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
771 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
775 /* Install a user level filter */
776 if (install_bpf_program(p, fp) < 0)
778 snprintf(p->errbuf, sizeof(p->errbuf),
779 "setfilter, unable to install the filter: %s", pcap_strerror(errno));
789 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
792 * XXX - if there were a PacketGetReadTimeout() call, we
793 * would use it, and return 1 if the timeout is -1
796 return (p->nonblock);
800 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
806 * Set the read timeout to -1 for non-blocking mode.
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.)
815 newtimeout = p->md.timeout;
817 if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
818 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
819 "PacketSetReadTimeout: %s", pcap_win32strerror());
822 p->nonblock = (newtimeout == -1);
826 /*platform-dependent routine to add devices other than NDIS interfaces*/
828 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)