2 * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (c) 2005 - 2010 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.
42 #include "pcap-airpcap.h"
44 /* Default size of the buffer we allocate in userland. */
45 #define AIRPCAP_DEFAULT_USER_BUFFER_SIZE 256000
47 /* Default size of the buffer for the AirPcap adapter. */
48 #define AIRPCAP_DEFAULT_KERNEL_BUFFER_SIZE 1000000
51 // We load the AirPcap DLL dynamically, so that the code will
52 // work whether you have it installed or not, and there don't
53 // have to be two different versions of the library, one linked
54 // to the AirPcap library and one not linked to it.
56 static pcap_code_handle_t airpcap_lib;
58 typedef PCHAR (*AirpcapGetLastErrorHandler)(PAirpcapHandle);
59 typedef BOOL (*AirpcapGetDeviceListHandler)(PAirpcapDeviceDescription *, PCHAR);
60 typedef VOID (*AirpcapFreeDeviceListHandler)(PAirpcapDeviceDescription);
61 typedef PAirpcapHandle (*AirpcapOpenHandler)(PCHAR, PCHAR);
62 typedef VOID (*AirpcapCloseHandler)(PAirpcapHandle);
63 typedef BOOL (*AirpcapSetDeviceMacFlagsHandler)(PAirpcapHandle, UINT);
64 typedef BOOL (*AirpcapSetLinkTypeHandler)(PAirpcapHandle, AirpcapLinkType);
65 typedef BOOL (*AirpcapGetLinkTypeHandler)(PAirpcapHandle, PAirpcapLinkType);
66 typedef BOOL (*AirpcapSetKernelBufferHandler)(PAirpcapHandle, UINT);
67 typedef BOOL (*AirpcapSetFilterHandler)(PAirpcapHandle, PVOID, UINT);
68 typedef BOOL (*AirpcapSetMinToCopyHandler)(PAirpcapHandle, UINT);
69 typedef BOOL (*AirpcapGetReadEventHandler)(PAirpcapHandle, HANDLE *);
70 typedef BOOL (*AirpcapReadHandler)(PAirpcapHandle, PBYTE, UINT, PUINT);
71 typedef BOOL (*AirpcapWriteHandler)(PAirpcapHandle, PCHAR, ULONG);
72 typedef BOOL (*AirpcapGetStatsHandler)(PAirpcapHandle, PAirpcapStats);
74 static AirpcapGetLastErrorHandler p_AirpcapGetLastError;
75 static AirpcapGetDeviceListHandler p_AirpcapGetDeviceList;
76 static AirpcapFreeDeviceListHandler p_AirpcapFreeDeviceList;
77 static AirpcapOpenHandler p_AirpcapOpen;
78 static AirpcapCloseHandler p_AirpcapClose;
79 static AirpcapSetDeviceMacFlagsHandler p_AirpcapSetDeviceMacFlags;
80 static AirpcapSetLinkTypeHandler p_AirpcapSetLinkType;
81 static AirpcapGetLinkTypeHandler p_AirpcapGetLinkType;
82 static AirpcapSetKernelBufferHandler p_AirpcapSetKernelBuffer;
83 static AirpcapSetFilterHandler p_AirpcapSetFilter;
84 static AirpcapSetMinToCopyHandler p_AirpcapSetMinToCopy;
85 static AirpcapGetReadEventHandler p_AirpcapGetReadEvent;
86 static AirpcapReadHandler p_AirpcapRead;
87 static AirpcapWriteHandler p_AirpcapWrite;
88 static AirpcapGetStatsHandler p_AirpcapGetStats;
92 AIRPCAP_API_UNLOADED = 0,
94 AIRPCAP_API_CANNOT_LOAD,
96 } AIRPCAP_API_LOAD_STATUS;
98 static AIRPCAP_API_LOAD_STATUS airpcap_load_status;
101 * NOTE: this function should be called by the pcap functions that can
102 * theoretically deal with the AirPcap library for the first time,
103 * namely listing the adapters and creating a pcap_t for an adapter.
104 * All the other ones (activate, close, read, write, set parameters)
105 * work on a pcap_t for an AirPcap device, meaning we've already
106 * created the pcap_t and thus have loaded the functions, so we do
107 * not need to call this function.
109 static AIRPCAP_API_LOAD_STATUS
110 load_airpcap_functions(void)
112 AIRPCAP_API_LOAD_STATUS current_status;
115 * We don't use a mutex because there's no place that
116 * we can guarantee we'll be called before any threads
117 * other than the main thread exists. (For example,
118 * this might be a static library, so we can't arrange
119 * to be called by DllMain(), and there's no guarantee
120 * that the application called pcap_init() - which is
121 * supposed to be called only from one thread - so
122 * we can't arrange to be called from it.)
124 * If nobody's tried to load it yet, mark it as
125 * loading; in any case, return the status before
128 current_status = InterlockedCompareExchange((LONG *)&airpcap_load_status,
129 AIRPCAP_API_LOADING, AIRPCAP_API_UNLOADED);
132 * If the status was AIRPCAP_API_UNLOADED, we've set it
133 * to AIRPCAP_API_LOADING, because we're going to be
134 * the ones to load the library but current_status is
135 * AIRPCAP_API_UNLOADED.
137 * if it was AIRPCAP_API_LOADING, meaning somebody else
138 * was trying to load it, spin until they finish and
139 * set the status to a value reflecting whether they
142 while (current_status == AIRPCAP_API_LOADING) {
143 current_status = InterlockedCompareExchange((LONG*)&airpcap_load_status,
144 AIRPCAP_API_LOADING, AIRPCAP_API_LOADING);
149 * At this point, current_status is either:
151 * AIRPCAP_API_LOADED, in which case another thread
152 * loaded the library, so we're done;
154 * AIRPCAP_API_CANNOT_LOAD, in which another thread
155 * tried and failed to load the library, so we're
156 * done - we won't try it ourselves;
158 * AIRPCAP_API_LOADING, in which case *we're* the
159 * ones loading it, and should now try to do so.
161 if (current_status == AIRPCAP_API_LOADED)
162 return AIRPCAP_API_LOADED;
164 if (current_status == AIRPCAP_API_CANNOT_LOAD)
165 return AIRPCAP_API_CANNOT_LOAD;
168 * Start out assuming we can't load it.
170 current_status = AIRPCAP_API_CANNOT_LOAD;
172 airpcap_lib = pcap_load_code("airpcap.dll");
173 if (airpcap_lib != NULL) {
175 * OK, we've loaded the library; now try to find the
176 * functions we need in it.
178 p_AirpcapGetLastError = (AirpcapGetLastErrorHandler) pcap_find_function(airpcap_lib, "AirpcapGetLastError");
179 p_AirpcapGetDeviceList = (AirpcapGetDeviceListHandler) pcap_find_function(airpcap_lib, "AirpcapGetDeviceList");
180 p_AirpcapFreeDeviceList = (AirpcapFreeDeviceListHandler) pcap_find_function(airpcap_lib, "AirpcapFreeDeviceList");
181 p_AirpcapOpen = (AirpcapOpenHandler) pcap_find_function(airpcap_lib, "AirpcapOpen");
182 p_AirpcapClose = (AirpcapCloseHandler) pcap_find_function(airpcap_lib, "AirpcapClose");
183 p_AirpcapSetDeviceMacFlags = (AirpcapSetDeviceMacFlagsHandler) pcap_find_function(airpcap_lib, "AirpcapSetDeviceMacFlags");
184 p_AirpcapSetLinkType = (AirpcapSetLinkTypeHandler) pcap_find_function(airpcap_lib, "AirpcapSetLinkType");
185 p_AirpcapGetLinkType = (AirpcapGetLinkTypeHandler) pcap_find_function(airpcap_lib, "AirpcapGetLinkType");
186 p_AirpcapSetKernelBuffer = (AirpcapSetKernelBufferHandler) pcap_find_function(airpcap_lib, "AirpcapSetKernelBuffer");
187 p_AirpcapSetFilter = (AirpcapSetFilterHandler) pcap_find_function(airpcap_lib, "AirpcapSetFilter");
188 p_AirpcapSetMinToCopy = (AirpcapSetMinToCopyHandler) pcap_find_function(airpcap_lib, "AirpcapSetMinToCopy");
189 p_AirpcapGetReadEvent = (AirpcapGetReadEventHandler) pcap_find_function(airpcap_lib, "AirpcapGetReadEvent");
190 p_AirpcapRead = (AirpcapReadHandler) pcap_find_function(airpcap_lib, "AirpcapRead");
191 p_AirpcapWrite = (AirpcapWriteHandler) pcap_find_function(airpcap_lib, "AirpcapWrite");
192 p_AirpcapGetStats = (AirpcapGetStatsHandler) pcap_find_function(airpcap_lib, "AirpcapGetStats");
195 // Make sure that we found everything
197 if (p_AirpcapGetLastError != NULL &&
198 p_AirpcapGetDeviceList != NULL &&
199 p_AirpcapFreeDeviceList != NULL &&
200 p_AirpcapOpen != NULL &&
201 p_AirpcapClose != NULL &&
202 p_AirpcapSetDeviceMacFlags != NULL &&
203 p_AirpcapSetLinkType != NULL &&
204 p_AirpcapGetLinkType != NULL &&
205 p_AirpcapSetKernelBuffer != NULL &&
206 p_AirpcapSetFilter != NULL &&
207 p_AirpcapSetMinToCopy != NULL &&
208 p_AirpcapGetReadEvent != NULL &&
209 p_AirpcapRead != NULL &&
210 p_AirpcapWrite != NULL &&
211 p_AirpcapGetStats != NULL) {
213 * We have all we need.
215 current_status = AIRPCAP_API_LOADED;
219 if (current_status != AIRPCAP_API_LOADED) {
221 * We failed; if we found the DLL, close the
224 if (airpcap_lib != NULL) {
225 FreeLibrary(airpcap_lib);
231 * Now set the status appropriately - and atomically.
233 InterlockedExchange((LONG *)&airpcap_load_status, current_status);
235 return current_status;
239 * Private data for capturing on AirPcap devices.
241 struct pcap_airpcap {
242 PAirpcapHandle adapter;
243 int filtering_in_kernel;
247 struct pcap_stat stat;
251 airpcap_setfilter(pcap_t *p, struct bpf_program *fp)
253 struct pcap_airpcap *pa = p->priv;
255 if (!p_AirpcapSetFilter(pa->adapter, fp->bf_insns,
256 fp->bf_len * sizeof(struct bpf_insn))) {
258 * Kernel filter not installed.
260 * XXX - we don't know whether this failed because:
262 * the kernel rejected the filter program as invalid,
263 * in which case we should fall back on userland
266 * the kernel rejected the filter program as too big,
267 * in which case we should again fall back on
268 * userland filtering;
270 * there was some other problem, in which case we
271 * should probably report an error;
273 * So we just fall back on userland filtering in
278 * install_bpf_program() validates the program.
280 * XXX - what if we already have a filter in the kernel?
282 if (install_bpf_program(p, fp) < 0)
284 pa->filtering_in_kernel = 0; /* filtering in userland */
291 pa->filtering_in_kernel = 1; /* filtering in the kernel */
294 * Discard any previously-received packets, as they might have
295 * passed whatever filter was formerly in effect, but might
296 * not pass this filter (BIOCSETF discards packets buffered
297 * in the kernel, so you can lose packets in any case).
304 airpcap_set_datalink(pcap_t *p, int dlt)
306 struct pcap_airpcap *pa = p->priv;
307 AirpcapLinkType type;
311 case DLT_IEEE802_11_RADIO:
312 type = AIRPCAP_LT_802_11_PLUS_RADIO;
316 type = AIRPCAP_LT_802_11_PLUS_PPI;
320 type = AIRPCAP_LT_802_11;
324 /* This can't happen; just return. */
327 if (!p_AirpcapSetLinkType(pa->adapter, type)) {
328 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
329 "AirpcapSetLinkType() failed: %s",
330 p_AirpcapGetLastError(pa->adapter));
338 airpcap_getnonblock(pcap_t *p)
340 struct pcap_airpcap *pa = p->priv;
342 return (pa->nonblock);
346 airpcap_setnonblock(pcap_t *p, int nonblock)
348 struct pcap_airpcap *pa = p->priv;
353 * Set the packet buffer timeout to -1 for non-blocking
359 * Restore the timeout set when the device was opened.
360 * (Note that this may be -1, in which case we're not
361 * really leaving non-blocking mode. However, although
362 * the timeout argument to pcap_set_timeout() and
363 * pcap_open_live() is an int, you're not supposed to
364 * supply a negative value, so that "shouldn't happen".)
366 newtimeout = p->opt.timeout;
368 pa->read_timeout = newtimeout;
369 pa->nonblock = (newtimeout == -1);
374 airpcap_stats(pcap_t *p, struct pcap_stat *ps)
376 struct pcap_airpcap *pa = p->priv;
380 * Try to get statistics.
382 if (!p_AirpcapGetStats(pa->adapter, &tas)) {
383 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
384 "AirpcapGetStats() failed: %s",
385 p_AirpcapGetLastError(pa->adapter));
389 ps->ps_drop = tas.Drops;
390 ps->ps_recv = tas.Recvs;
391 ps->ps_ifdrop = tas.IfDrops;
397 * Win32-only routine for getting statistics.
399 * This way is definitely safer than passing the pcap_stat * from the userland.
400 * In fact, there could happen than the user allocates a variable which is not
401 * big enough for the new structure, and the library will write in a zone
402 * which is not allocated to this variable.
404 * In this way, we're pretty sure we are writing on memory allocated to this
407 * XXX - but this is the wrong way to handle statistics. Instead, we should
408 * have an API that returns data in a form like the Options section of a
409 * pcapng Interface Statistics Block:
411 * https://xml2rfc.tools.ietf.org/cgi-bin/xml2rfc.cgi?url=https://raw.githubusercontent.com/pcapng/pcapng/master/draft-tuexen-opsawg-pcapng.xml&modeAsFormat=html/ascii&type=ascii#rfc.section.4.6
413 * which would let us add new statistics straightforwardly and indicate which
414 * statistics we are and are *not* providing, rather than having to provide
415 * possibly-bogus values for statistics we can't provide.
417 static struct pcap_stat *
418 airpcap_stats_ex(pcap_t *p, int *pcap_stat_size)
420 struct pcap_airpcap *pa = p->priv;
423 *pcap_stat_size = sizeof (p->stat);
426 * Try to get statistics.
428 if (!p_AirpcapGetStats(pa->adapter, &tas)) {
429 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
430 "AirpcapGetStats() failed: %s",
431 p_AirpcapGetLastError(pa->adapter));
435 p->stat.ps_recv = tas.Recvs;
436 p->stat.ps_drop = tas.Drops;
437 p->stat.ps_ifdrop = tas.IfDrops;
439 * Just in case this is ever compiled for a target other than
440 * Windows, which is extremely unlikely at best.
443 p->stat.ps_capt = tas.Capt;
448 /* Set the dimension of the kernel-level capture buffer */
450 airpcap_setbuff(pcap_t *p, int dim)
452 struct pcap_airpcap *pa = p->priv;
454 if (!p_AirpcapSetKernelBuffer(pa->adapter, dim)) {
455 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
456 "AirpcapSetKernelBuffer() failed: %s",
457 p_AirpcapGetLastError(pa->adapter));
463 /* Set the driver working mode */
465 airpcap_setmode(pcap_t *p, int mode)
467 if (mode != MODE_CAPT) {
468 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
469 "Only MODE_CAPT is supported on an AirPcap adapter");
475 /*set the minimum amount of data that will release a read call*/
477 airpcap_setmintocopy(pcap_t *p, int size)
479 struct pcap_airpcap *pa = p->priv;
481 if (!p_AirpcapSetMinToCopy(pa->adapter, size)) {
482 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
483 "AirpcapSetMinToCopy() failed: %s",
484 p_AirpcapGetLastError(pa->adapter));
491 airpcap_getevent(pcap_t *p)
493 struct pcap_airpcap *pa = p->priv;
495 return (pa->read_event);
499 airpcap_oid_get_request(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_,
502 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
503 "Getting OID values is not supported on an AirPcap adapter");
508 airpcap_oid_set_request(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_,
511 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
512 "Setting OID values is not supported on an AirPcap adapter");
517 airpcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue _U_, int sync _U_)
519 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
520 "Cannot queue packets for transmission on an AirPcap adapter");
525 airpcap_setuserbuffer(pcap_t *p, int size)
527 unsigned char *new_buff;
530 /* Bogus parameter */
531 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
532 "Error: invalid size %d",size);
536 /* Allocate the buffer */
537 new_buff = (unsigned char *)malloc(sizeof(char)*size);
540 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
541 "Error: not enough memory");
547 p->buffer = new_buff;
554 airpcap_live_dump(pcap_t *p, char *filename _U_, int maxsize _U_,
557 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
558 "AirPcap adapters don't support live dump");
563 airpcap_live_dump_ended(pcap_t *p, int sync _U_)
565 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
566 "AirPcap adapters don't support live dump");
570 static PAirpcapHandle
571 airpcap_get_airpcap_handle(pcap_t *p)
573 struct pcap_airpcap *pa = p->priv;
575 return (pa->adapter);
579 airpcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
581 struct pcap_airpcap *pa = p->priv;
584 register u_char *bp, *ep;
591 * Has "pcap_breakloop()" been called?
595 * Yes - clear the flag that indicates that it
596 * has, and return PCAP_ERROR_BREAK to indicate
597 * that we were told to break out of the loop.
600 return (PCAP_ERROR_BREAK);
604 // If we're not in non-blocking mode, wait for data to
607 if (pa->read_timeout != -1) {
608 WaitForSingleObject(pa->read_event,
609 (pa->read_timeout ==0 )? INFINITE: pa->read_timeout);
614 // p_AirpcapRead doesn't block.
616 if (!p_AirpcapRead(pa->adapter, (PBYTE)p->buffer,
617 p->bufsize, &bytes_read)) {
618 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
619 "AirpcapRead() failed: %s",
620 p_AirpcapGetLastError(pa->adapter));
624 bp = (u_char *)p->buffer;
629 * Loop through each packet.
631 * This assumes that a single buffer of packets will have
632 * <= INT_MAX packets, so the packet count doesn't overflow.
634 #define bhp ((AirpcapBpfHeader *)bp)
638 register u_int caplen, hdrlen;
641 * Has "pcap_breakloop()" been called?
642 * If so, return immediately - if we haven't read any
643 * packets, clear the flag and return PCAP_ERROR_BREAK
644 * to indicate that we were told to break out of the loop,
645 * otherwise leave the flag set, so that the *next* call
646 * will break out of the loop without having read any
647 * packets, and return the number of packets we've
653 return (PCAP_ERROR_BREAK);
656 p->cc = (int) (ep - bp);
663 caplen = bhp->Caplen;
664 hdrlen = bhp->Hdrlen;
667 * Short-circuit evaluation: if using BPF filter
668 * in the AirPcap adapter, no need to do it now -
669 * we already know the packet passed the filter.
671 if (pa->filtering_in_kernel ||
672 p->fcode.bf_insns == NULL ||
673 pcap_filter(p->fcode.bf_insns, datap, bhp->Originallen, caplen)) {
674 struct pcap_pkthdr pkthdr;
676 pkthdr.ts.tv_sec = bhp->TsSec;
677 pkthdr.ts.tv_usec = bhp->TsUsec;
678 pkthdr.caplen = caplen;
679 pkthdr.len = bhp->Originallen;
680 (*callback)(user, &pkthdr, datap);
681 bp += AIRPCAP_WORDALIGN(caplen + hdrlen);
682 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
684 p->cc = (int)(ep - bp);
691 bp += AIRPCAP_WORDALIGN(caplen + hdrlen);
700 airpcap_inject(pcap_t *p, const void *buf, int size)
702 struct pcap_airpcap *pa = p->priv;
705 * XXX - the second argument to AirpcapWrite() *should* have
706 * been declared as a const pointer - a write function that
707 * stomps on what it writes is *extremely* rude - but such
708 * is life. We assume it is, in fact, not going to write on
711 if (!p_AirpcapWrite(pa->adapter, (void *)buf, size)) {
712 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
713 "AirpcapWrite() failed: %s",
714 p_AirpcapGetLastError(pa->adapter));
719 * We assume it all got sent if "AirpcapWrite()" succeeded.
720 * "pcap_inject()" is expected to return the number of bytes
727 airpcap_cleanup(pcap_t *p)
729 struct pcap_airpcap *pa = p->priv;
731 if (pa->adapter != NULL) {
732 p_AirpcapClose(pa->adapter);
735 pcap_cleanup_live_common(p);
739 airpcap_breakloop(pcap_t *p)
743 pcap_breakloop_common(p);
744 struct pcap_airpcap *pa = p->priv;
746 /* XXX - what if either of these fail? */
748 * XXX - will SetEvent() force a wakeup and, if so, will
749 * the AirPcap read code handle that sanely?
751 if (!p_AirpcapGetReadEvent(pa->adapter, &read_event))
753 SetEvent(read_event);
757 airpcap_activate(pcap_t *p)
759 struct pcap_airpcap *pa = p->priv;
760 char *device = p->opt.device;
761 char airpcap_errbuf[AIRPCAP_ERRBUF_SIZE];
763 AirpcapLinkType link_type;
765 pa->adapter = p_AirpcapOpen(device, airpcap_errbuf);
766 if (pa->adapter == NULL) {
767 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s", airpcap_errbuf);
772 * Set monitor mode appropriately.
773 * Always turn off the "ACK frames sent to the card" mode.
776 status = p_AirpcapSetDeviceMacFlags(pa->adapter,
777 AIRPCAP_MF_MONITOR_MODE_ON);
779 status = p_AirpcapSetDeviceMacFlags(pa->adapter,
780 AIRPCAP_MF_ACK_FRAMES_ON);
782 p_AirpcapClose(pa->adapter);
783 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
784 "AirpcapSetDeviceMacFlags() failed: %s",
785 p_AirpcapGetLastError(pa->adapter));
790 * Turn a negative snapshot value (invalid), a snapshot value of
791 * 0 (unspecified), or a value bigger than the normal maximum
792 * value, into the maximum allowed value.
794 * If some application really *needs* a bigger snapshot
795 * length, we should just increase MAXIMUM_SNAPLEN.
797 if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
798 p->snapshot = MAXIMUM_SNAPLEN;
801 * If the buffer size wasn't explicitly set, default to
802 * AIRPCAP_DEFAULT_KERNEL_BUFFER_SIZE.
804 if (p->opt.buffer_size == 0)
805 p->opt.buffer_size = AIRPCAP_DEFAULT_KERNEL_BUFFER_SIZE;
807 if (!p_AirpcapSetKernelBuffer(pa->adapter, p->opt.buffer_size)) {
808 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
809 "AirpcapSetKernelBuffer() failed: %s",
810 p_AirpcapGetLastError(pa->adapter));
814 if(!p_AirpcapGetReadEvent(pa->adapter, &pa->read_event)) {
815 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
816 "AirpcapGetReadEvent() failed: %s",
817 p_AirpcapGetLastError(pa->adapter));
821 /* Set the buffer size */
822 p->bufsize = AIRPCAP_DEFAULT_USER_BUFFER_SIZE;
823 p->buffer = malloc(p->bufsize);
824 if (p->buffer == NULL) {
825 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
830 if (p->opt.immediate) {
831 /* Tell the driver to copy the buffer as soon as data arrives. */
832 if (!p_AirpcapSetMinToCopy(pa->adapter, 0)) {
833 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
834 "AirpcapSetMinToCopy() failed: %s",
835 p_AirpcapGetLastError(pa->adapter));
840 * Tell the driver to copy the buffer only if it contains
843 if (!p_AirpcapSetMinToCopy(pa->adapter, 16000)) {
844 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
845 "AirpcapSetMinToCopy() failed: %s",
846 p_AirpcapGetLastError(pa->adapter));
852 * Find out what the default link-layer header type is,
853 * and set p->datalink to that.
855 * We don't force it to another value because there
856 * might be some programs using WinPcap/Npcap that,
857 * when capturing on AirPcap devices, assume the
858 * default value set with the AirPcap configuration
859 * program is what you get.
861 * The out-of-the-box default appears to be radiotap.
863 if (!p_AirpcapGetLinkType(pa->adapter, &link_type)) {
865 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
866 "AirpcapGetLinkType() failed: %s",
867 p_AirpcapGetLastError(pa->adapter));
872 case AIRPCAP_LT_802_11_PLUS_RADIO:
873 p->linktype = DLT_IEEE802_11_RADIO;
876 case AIRPCAP_LT_802_11_PLUS_PPI:
877 p->linktype = DLT_PPI;
880 case AIRPCAP_LT_802_11:
881 p->linktype = DLT_IEEE802_11;
884 case AIRPCAP_LT_UNKNOWN:
887 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
888 "AirpcapGetLinkType() returned unknown link type %u",
894 * Now provide a list of all the supported types; we
895 * assume they all work. We put radiotap at the top,
896 * followed by PPI, followed by "no radio metadata".
898 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 3);
899 if (p->dlt_list == NULL)
901 p->dlt_list[0] = DLT_IEEE802_11_RADIO;
902 p->dlt_list[1] = DLT_PPI;
903 p->dlt_list[2] = DLT_IEEE802_11;
906 p->read_op = airpcap_read;
907 p->inject_op = airpcap_inject;
908 p->setfilter_op = airpcap_setfilter;
909 p->setdirection_op = NULL; /* Not implemented. */
910 p->set_datalink_op = airpcap_set_datalink;
911 p->getnonblock_op = airpcap_getnonblock;
912 p->setnonblock_op = airpcap_setnonblock;
913 p->breakloop_op = airpcap_breakloop;
914 p->stats_op = airpcap_stats;
915 p->stats_ex_op = airpcap_stats_ex;
916 p->setbuff_op = airpcap_setbuff;
917 p->setmode_op = airpcap_setmode;
918 p->setmintocopy_op = airpcap_setmintocopy;
919 p->getevent_op = airpcap_getevent;
920 p->oid_get_request_op = airpcap_oid_get_request;
921 p->oid_set_request_op = airpcap_oid_set_request;
922 p->sendqueue_transmit_op = airpcap_sendqueue_transmit;
923 p->setuserbuffer_op = airpcap_setuserbuffer;
924 p->live_dump_op = airpcap_live_dump;
925 p->live_dump_ended_op = airpcap_live_dump_ended;
926 p->get_airpcap_handle_op = airpcap_get_airpcap_handle;
927 p->cleanup_op = airpcap_cleanup;
936 * Monitor mode is supported.
939 airpcap_can_set_rfmon(pcap_t *p)
945 device_is_airpcap(const char *device, char *ebuf)
947 static const char airpcap_prefix[] = "\\\\.\\airpcap";
950 * We don't determine this by calling AirpcapGetDeviceList()
951 * and looking at the list, as that appears to be a costly
954 * Instead, we just check whether it begins with "\\.\airpcap".
956 if (strncmp(device, airpcap_prefix, sizeof airpcap_prefix - 1) == 0) {
958 * Yes, it's an AirPcap device.
964 * No, it's not an AirPcap device.
970 airpcap_create(const char *device, char *ebuf, int *is_ours)
976 * This can be called before we've tried loading the library,
977 * so do so if we haven't already tried to do so.
979 if (load_airpcap_functions() != AIRPCAP_API_LOADED) {
981 * We assume this means that we don't have the AirPcap
982 * software installed, which probably means we don't
983 * have an AirPcap device.
985 * Don't treat that as an error.
992 * Is this an AirPcap device?
994 ret = device_is_airpcap(device, ebuf);
1005 p = PCAP_CREATE_COMMON(ebuf, struct pcap_airpcap);
1009 p->activate_op = airpcap_activate;
1010 p->can_set_rfmon_op = airpcap_can_set_rfmon;
1015 * Add all AirPcap devices.
1018 airpcap_findalldevs(pcap_if_list_t *devlistp, char *errbuf)
1020 AirpcapDeviceDescription *airpcap_devices, *airpcap_device;
1021 char airpcap_errbuf[AIRPCAP_ERRBUF_SIZE];
1024 * This can be called before we've tried loading the library,
1025 * so do so if we haven't already tried to do so.
1027 if (load_airpcap_functions() != AIRPCAP_API_LOADED) {
1029 * XXX - unless the error is "no such DLL", report this
1030 * as an error rather than as "no AirPcap devices"?
1035 if (!p_AirpcapGetDeviceList(&airpcap_devices, airpcap_errbuf)) {
1036 snprintf(errbuf, PCAP_ERRBUF_SIZE,
1037 "AirpcapGetDeviceList() failed: %s", airpcap_errbuf);
1041 for (airpcap_device = airpcap_devices; airpcap_device != NULL;
1042 airpcap_device = airpcap_device->next) {
1043 if (add_dev(devlistp, airpcap_device->Name, 0,
1044 airpcap_device->Description, errbuf) == NULL) {
1048 p_AirpcapFreeDeviceList(airpcap_devices);
1052 p_AirpcapFreeDeviceList(airpcap_devices);