2 * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (c) 2005 - 2007 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 1.25.2.7 2007/06/14 22:07:14 gianluca Exp $ (LBL)";
45 #endif /* HAVE_DAG_API */
48 #define errno (*_errno())
49 #endif /* __MINGW32__ */
51 static int pcap_setfilter_win32_npf(pcap_t *, struct bpf_program *);
52 static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *);
53 static int pcap_getnonblock_win32(pcap_t *, char *);
54 static int pcap_setnonblock_win32(pcap_t *, int, char *);
56 #define PcapBufSize 256000 /*dimension of the buffer in the pcap_t structure*/
57 #define SIZE_BUF 1000000
59 /* Equivalent to ntohs(), but a lot faster under Windows */
60 #define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
63 * Header that the WinPcap driver associates to the packets.
67 struct timeval bh_tstamp; /* time stamp */
68 bpf_u_int32 bh_caplen; /* length of captured portion */
69 bpf_u_int32 bh_datalen; /* original length of packet */
70 u_short bh_hdrlen; /* length of bpf header (this struct
71 plus alignment padding) */
78 WORD wVersionRequested;
81 wVersionRequested = MAKEWORD( 1, 1);
82 err = WSAStartup( wVersionRequested, &wsaData );
92 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
95 if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
96 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
104 pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
108 register u_char *bp, *ep;
113 * Has "pcap_breakloop()" been called?
117 * Yes - clear the flag that indicates that it
118 * has, and return -2 to indicate that we were
119 * told to break out of the loop.
125 /* capture the packets */
126 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
127 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
131 cc = p->Packet->ulBytesReceived;
133 bp = p->Packet->Buffer;
139 * Loop through each packet.
141 #define bhp ((struct bpf_hdr *)bp)
144 register int caplen, hdrlen;
147 * Has "pcap_breakloop()" been called?
148 * If so, return immediately - if we haven't read any
149 * packets, clear the flag and return -2 to indicate
150 * that we were told to break out of the loop, otherwise
151 * leave the flag set, so that the *next* call will break
152 * out of the loop without having read any packets, and
153 * return the number of packets we've processed so far.
168 caplen = bhp->bh_caplen;
169 hdrlen = bhp->bh_hdrlen;
172 * XXX A bpf_hdr matches a pcap_pkthdr.
174 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
175 bp += BPF_WORDALIGN(caplen + hdrlen);
176 if (++n >= cnt && cnt > 0) {
189 pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
192 int packet_len = 0, caplen = 0;
193 struct pcap_pkthdr pcap_header;
196 dag_record_t *header;
197 unsigned erf_record_len;
201 unsigned dfp = p->adapter->DagFastProcess;
204 if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
206 /* Get new packets from the network */
207 if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){
208 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
212 cc = p->Packet->ulBytesReceived;
214 /* The timeout has expired but we no packets arrived */
216 header = (dag_record_t*)p->adapter->DagBuffer;
219 header = (dag_record_t*)p->bp;
221 endofbuf = (char*)header + cc;
224 * Cycle through the packets
228 erf_record_len = SWAPS(header->rlen);
229 if((char*)header + erf_record_len > endofbuf)
232 /* Increase the number of captured packets */
233 p->md.stat.ps_recv++;
235 /* Find the beginning of the packet */
236 dp = ((u_char *)header) + dag_record_size;
238 /* Determine actual packet len */
242 packet_len = ATM_SNAPLEN;
243 caplen = ATM_SNAPLEN;
249 swt = SWAPS(header->wlen);
250 packet_len = swt - (p->md.dag_fcs_bits);
251 caplen = erf_record_len - dag_record_size - 2;
252 if (caplen > packet_len)
261 swt = SWAPS(header->wlen);
262 packet_len = swt - (p->md.dag_fcs_bits);
263 caplen = erf_record_len - dag_record_size;
264 if (caplen > packet_len)
272 if(caplen > p->snapshot)
273 caplen = p->snapshot;
276 * Has "pcap_breakloop()" been called?
277 * If so, return immediately - if we haven't read any
278 * packets, clear the flag and return -2 to indicate
279 * that we were told to break out of the loop, otherwise
280 * leave the flag set, so that the *next* call will break
281 * out of the loop without having read any packets, and
282 * return the number of packets we've processed so far.
293 p->bp = (char*)header;
294 p->cc = endofbuf - (char*)header;
301 /* convert between timestamp formats */
303 pcap_header.ts.tv_sec = (int)(ts >> 32);
304 ts = (ts & 0xffffffffi64) * 1000000;
305 ts += 0x80000000; /* rounding */
306 pcap_header.ts.tv_usec = (int)(ts >> 32);
307 if (pcap_header.ts.tv_usec >= 1000000) {
308 pcap_header.ts.tv_usec -= 1000000;
309 pcap_header.ts.tv_sec++;
313 /* No underlaying filtering system. We need to filter on our own */
314 if (p->fcode.bf_insns)
316 if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
318 /* Move to next packet */
319 header = (dag_record_t*)((char*)header + erf_record_len);
324 /* Fill the header for the user suppplied callback function */
325 pcap_header.caplen = caplen;
326 pcap_header.len = packet_len;
328 /* Call the callback function */
329 (*callback)(user, &pcap_header, dp);
331 /* Move to next packet */
332 header = (dag_record_t*)((char*)header + erf_record_len);
334 /* Stop if the number of packets requested by user has been reached*/
335 if (++n >= cnt && cnt > 0)
337 p->bp = (char*)header;
338 p->cc = endofbuf - (char*)header;
342 while((u_char*)header < endofbuf);
346 #endif /* HAVE_DAG_API */
348 /* Send a packet to the network */
350 pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
351 LPPACKET PacketToSend;
353 PacketToSend=PacketAllocatePacket();
355 if (PacketToSend == NULL)
357 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
361 PacketInitPacket(PacketToSend,(PVOID)buf,size);
362 if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
363 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
364 PacketFreePacket(PacketToSend);
368 PacketFreePacket(PacketToSend);
371 * We assume it all got sent if "PacketSendPacket()" succeeded.
372 * "pcap_inject()" is expected to return the number of bytes
379 pcap_close_win32(pcap_t *p)
381 pcap_close_common(p);
382 if (p->adapter != NULL) {
383 PacketCloseAdapter(p->adapter);
387 PacketFreePacket(p->Packet);
393 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
402 p = (pcap_t *)malloc(sizeof(*p));
405 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
408 memset(p, 0, sizeof(*p));
411 p->adapter = PacketOpenAdapter((char*)device);
413 if (p->adapter == NULL)
416 /* Adapter detected but we are not able to open it. Return failure. */
417 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
422 if(PacketGetNetType (p->adapter,&type) == FALSE)
424 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
429 switch (type.LinkType)
432 p->linktype = DLT_EN10MB;
435 case NdisMedium802_3:
436 p->linktype = DLT_EN10MB;
438 * This is (presumably) a real Ethernet capture; give it a
439 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
440 * that an application can let you choose it, in case you're
441 * capturing DOCSIS traffic that a Cisco Cable Modem
442 * Termination System is putting out onto an Ethernet (it
443 * doesn't put an Ethernet header onto the wire, it puts raw
444 * DOCSIS frames out on the wire inside the low-level
447 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
449 * If that fails, just leave the list empty.
451 if (p->dlt_list != NULL) {
452 p->dlt_list[0] = DLT_EN10MB;
453 p->dlt_list[1] = DLT_DOCSIS;
459 p->linktype = DLT_FDDI;
462 case NdisMedium802_5:
463 p->linktype = DLT_IEEE802;
466 case NdisMediumArcnetRaw:
467 p->linktype = DLT_ARCNET;
470 case NdisMediumArcnet878_2:
471 p->linktype = DLT_ARCNET;
475 p->linktype = DLT_ATM_RFC1483;
478 case NdisMediumCHDLC:
479 p->linktype = DLT_CHDLC;
482 case NdisMediumPPPSerial:
483 p->linktype = DLT_PPP_SERIAL;
487 p->linktype = DLT_NULL;
490 case NdisMediumBare80211:
491 p->linktype = DLT_IEEE802_11;
494 case NdisMediumRadio80211:
495 p->linktype = DLT_IEEE802_11_RADIO;
499 p->linktype = DLT_PPI;
503 p->linktype = DLT_EN10MB; /*an unknown adapter is assumed to be ethernet*/
507 /* Set promiscuous mode */
511 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
513 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
519 if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE)
521 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
526 /* Set the buffer size */
527 p->bufsize = PcapBufSize;
529 /* Store the timeout. Used by pcap_setnonblock() */
532 /* allocate Packet structure used during the capture */
533 if((p->Packet = PacketAllocatePacket())==NULL)
535 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
539 if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
542 * Traditional Adapter
545 p->buffer = (u_char *)malloc(PcapBufSize);
546 if (p->buffer == NULL)
548 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
552 PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
554 p->snapshot = snaplen;
556 /* allocate the standard buffer in the driver */
557 if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
559 snprintf(ebuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
563 /* tell the driver to copy the buffer only if it contains at least 16K */
564 if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
566 snprintf(ebuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
583 snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
584 "SYSTEM\\CurrentControlSet\\Services\\DAG",
585 strstr(_strlwr((char*)device), "dag"));
588 status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
589 if(status != ERROR_SUCCESS)
592 status = RegQueryValueEx(dagkey,
599 if(status != ERROR_SUCCESS)
609 p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
611 /* Set the length of the FCS associated to any packet. This value
612 * will be subtracted to the packet length */
613 p->md.dag_fcs_bits = p->adapter->DagFcsLen;
617 #endif /* HAVE_DAG_API */
619 PacketSetReadTimeout(p->adapter, to_ms);
622 if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
624 /* install dag specific handlers for read and setfilter */
625 p->read_op = pcap_read_win32_dag;
626 p->setfilter_op = pcap_setfilter_win32_dag;
630 #endif /* HAVE_DAG_API */
631 /* install traditional npf handlers for read and setfilter */
632 p->read_op = pcap_read_win32_npf;
633 p->setfilter_op = pcap_setfilter_win32_npf;
636 #endif /* HAVE_DAG_API */
637 p->setdirection_op = NULL; /* Not implemented. */
638 /* XXX - can this be implemented on some versions of Windows? */
639 p->inject_op = pcap_inject_win32;
640 p->set_datalink_op = NULL; /* can't change data link type */
641 p->getnonblock_op = pcap_getnonblock_win32;
642 p->setnonblock_op = pcap_setnonblock_win32;
643 p->stats_op = pcap_stats_win32;
644 p->close_op = pcap_close_win32;
649 PacketCloseAdapter(p->adapter);
650 if (p->buffer != NULL)
653 PacketFreePacket(p->Packet);
655 * Get rid of any link-layer type list we allocated.
657 if (p->dlt_list != NULL)
665 pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
667 if(PacketSetBpf(p->adapter,fp)==FALSE){
669 * Kernel filter not installed.
670 * XXX - fall back on userland filtering, as is done
671 * on other platforms?
673 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
678 * Discard any previously-received packets, as they might have
679 * passed whatever filter was formerly in effect, but might
680 * not pass this filter (BIOCSETF discards packets buffered
681 * in the kernel, so you can lose packets in any case).
688 * We filter at user level, since the kernel driver does't process the packets
691 pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
695 strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
699 /* Install a user level filter */
700 if (install_bpf_program(p, fp) < 0)
702 snprintf(p->errbuf, sizeof(p->errbuf),
703 "setfilter, unable to install the filter: %s", pcap_strerror(errno));
713 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
716 * XXX - if there were a PacketGetReadTimeout() call, we
717 * would use it, and return 1 if the timeout is -1
720 return (p->nonblock);
724 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
730 * Set the read timeout to -1 for non-blocking mode.
735 * Restore the timeout set when the device was opened.
736 * (Note that this may be -1, in which case we're not
737 * really leaving non-blocking mode.)
739 newtimeout = p->timeout;
741 if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
742 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
743 "PacketSetReadTimeout: %s", pcap_win32strerror());
746 p->nonblock = (newtimeout == -1);
750 /* Set the driver working mode */
752 pcap_setmode(pcap_t *p, int mode){
754 if (p->adapter==NULL)
756 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode while reading from a file");
760 if(PacketSetMode(p->adapter,mode)==FALSE)
762 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
769 /* Set the dimension of the kernel-level capture buffer */
771 pcap_setbuff(pcap_t *p, int dim)
773 if (p->adapter==NULL)
775 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set while reading from a file");
779 if(PacketSetBuff(p->adapter,dim)==FALSE)
781 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
787 /*set the minimum amount of data that will release a read call*/
789 pcap_setmintocopy(pcap_t *p, int size)
791 if (p->adapter==NULL)
793 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Impossible to set the mintocopy parameter on an offline capture");
797 if(PacketSetMinToCopy(p->adapter, size)==FALSE)
799 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");