2 * Copyright (c) 2006-2007 CACE Technologies, Davis (California)
5 * SPDX-License-Identifier: BSD-3-Clause
8 #if !defined(AIRPCAP_H__EAE405F5_0171_9592_B3C2_C19EC426AD34__INCLUDED_)
9 #define AIRPCAP_H__EAE405F5_0171_9592_B3C2_C19EC426AD34__INCLUDED_
12 /* This stops VS2005 ranting against stdio. */
13 #pragma warning( disable : 4996)
25 \mainpage AirPcap interface documentation
29 This document describes the data structures and the functions exported by the CACE Technologies AirPcap library.
30 The AirPcap library provides low-level access to the AirPcap driver including advanced capabilities such as channel setting,
31 link type control and WEP configuration.<br>
32 This manual includes the following sections:
34 \note throughout this documentation, \e device refers to a physical USB AirPcap device, while \e adapter is an open API
35 instance. Most of the AirPcap API operations are adapter-specific but some of them, like setting the channel, are
36 per-device and will be reflected on all the open adapters. These functions will have "Device" in their name, e.g.
37 AirpcapSetDeviceChannel().
46 /** @defgroup airpcapdefs AirPcap definitions and data structures
51 \brief This string is the fixed prefix in the airpcap adapter name.
52 It can be used to parse the name field in an AirpcapDeviceDescription structure.
54 #define AIRPCAP_DEVICE_NAME_PREFIX "\\\\.\\airpcap"
57 \brief This string is the scanf modifier to extract the adapter number from an adapter name.
58 It can be used to parse the name field in an AirpcapDeviceDescription structure with scanf.
60 #define AIRPCAP_DEVICE_NUMBER_EXTRACT_STRING "\\\\.\\airpcap%u"
62 #define AIRPCAP_DEVICE_ANY_EXTRACT_STRING "\\\\.\\airpcap_any"
65 \brief Entry in the list returned by \ref AirpcapGetDeviceList();
67 typedef struct _AirpcapDeviceDescription
69 struct _AirpcapDeviceDescription *next; /* < Next element in the list */
70 gchar * Name; /* < Device name */
71 gchar * Description; /* < Device description */
72 } AirpcapDeviceDescription, *PAirpcapDeviceDescription;
74 #define MAX_ENCRYPTION_KEYS 64
76 #define WEP_KEY_MAX_SIZE 32 /* < Maximum size of a WEP key, in bytes. This is the size of an entry in the
77 < AirpcapWepKeysCollection structure. */
86 #define AIRPCAP_KEYTYPE_WEP 0 /* < Key type: WEP. The key can have an arbitrary length smaller than 32 bytes. */
87 #define AIRPCAP_KEYTYPE_TKIP 1 /* < Key type: TKIP (WPA). NOT SUPPORTED YET. */
88 #define AIRPCAP_KEYTYPE_CCMP 2 /* < Key type: CCMP (WPA2). NOT SUPPORTED YET. */
91 \brief WEP key container
93 typedef struct _AirpcapKey
95 guint KeyType; /* < Type of key, can be on of: \ref AIRPCAP_KEYTYPE_WEP, \ref AIRPCAP_KEYTYPE_TKIP, \ref AIRPCAP_KEYTYPE_CCMP. Only AIRPCAP_KEYTYPE_WEP is supported by the driver at the moment. */
96 guint KeyLen; /* < Length of the key, in bytes */
97 guint8 KeyData[WEP_KEY_MAX_SIZE]; /* < Key Data */
100 __attribute__((__packed__))
102 AirpcapKey, *PAirpcapKey;
105 \brief frequency Band.
106 802.11 adapters can support different frequency bands, the most important of which are: 2.4GHz (802.11b/g/n)
107 and 5GHz (802.11a/n).
109 typedef enum _AirpcapChannelBand
111 AIRPCAP_CB_AUTO = 1, /* < Automatically pick the best frequency band */
112 AIRPCAP_CB_2_4_GHZ = 2, /* < 2.4 GHz frequency band */
113 AIRPCAP_CB_4_GHZ = 4, /* < 4 GHz frequency band */
114 AIRPCAP_CB_5_GHZ = 5 /* < 5 GHz frequency band */
115 }AirpcapChannelBand, *PAirpcapChannelBand;
118 \brief Type of frame validation the adapter performs.
119 An adapter can be instructed to accept different kind of frames: correct frames only, frames with wrong Frame Check Sequence (FCS) only, all frames.
121 typedef enum _AirpcapValidationType
123 AIRPCAP_VT_ACCEPT_EVERYTHING = 1, /* < Accept all the frames the device captures */
124 AIRPCAP_VT_ACCEPT_CORRECT_FRAMES = 2, /* < Accept correct frames only, i.e. frames with correct Frame Check Sequence (FCS). */
125 AIRPCAP_VT_ACCEPT_CORRUPT_FRAMES = 3, /* < Accept corrupt frames only, i.e. frames with wrong Frame Check Sequence (FCS). */
126 AIRPCAP_VT_UNKNOWN = 4 /* < Unknown validation type. You should see it only in case of error. */
127 }AirpcapValidationType, *PAirpcapValidationType;
130 \brief Type of decryption the adapter performs.
131 An adapter can be instructed to turn decryption (based on the device-configured keys configured
132 with \ref AirpcapSetDeviceKeys()) on or off.
134 typedef enum _AirpcapDecryptionState
136 AIRPCAP_DECRYPTION_ON = 1, /* < This adapter performs decryption */
137 AIRPCAP_DECRYPTION_OFF = 2 /* < This adapter does not perform decryption */
138 }AirpcapDecryptionState, *PAirpcapDecryptionState;
142 \brief Storage for a MAC address
144 typedef struct _AirpcapMacAddress
146 guint8 Address[6]; /* < MAC address bytes */
149 __attribute__((__packed__))
151 AirpcapMacAddress, *PAirpcapMacAddress;
154 \brief This structure is used to store a collection of WEP keys.
155 Note that the definition of the structure has one key in it
156 (so that this code can be compiled by compilers that don't
157 support zero-length arrays), so be careful to allocate a buffer
158 with the size of the set of keys, as per the following example:
161 PAirpcapKeysCollection KeysCollection;
162 guint KeysCollectionSize;
164 KeysCollectionSize = AirpcapKeysCollectionSize(NumKeys);
166 KeysCollection = (PAirpcapKeysCollection)malloc(KeysCollectionSize);
173 typedef struct _AirpcapKeysCollection
175 guint nKeys; /* < Number of keys in the collection */
176 AirpcapKey Keys[1]; /* < Array of nKeys keys. */
177 } AirpcapKeysCollection, *PAirpcapKeysCollection;
179 #define AirpcapKeysCollectionSize(nKeys) \
180 ((sizeof(AirpcapKeysCollection) - sizeof(AirpcapKey)) + ((nKeys) * sizeof(AirpcapKey)))
181 #define AirpcapKeysCollectionSizeToKeyCount(size) \
182 (guint)(((size) - AirpcapKeysCollectionSize(0))/sizeof(AirpcapKey))
185 \brief Packet header.
187 This structure defines the BPF that precedes every packet delivered to the application.
189 typedef struct _AirpcapBpfHeader
191 guint TsSec; /* < Timestamp associated with the captured packet. SECONDS. */
192 guint TsUsec; /* < Timestamp associated with the captured packet. MICROSECONDS. */
193 guint Caplen; /* < Length of captured portion. The captured portion <b>can be different</b> from the original packet, because it is possible (with a proper filter) to instruct the driver to capture only a portion of the packets. */
194 guint Originallen; /* < Original length of packet */
195 guint16 Hdrlen; /* < Length of bpf header (this struct plus alignment padding). In some cases, a padding could be added between the end of this structure and the packet data for performance reasons. This field can be used to retrieve the actual data of the packet. */
198 __attribute__((__packed__))
200 AirpcapBpfHeader, *PAirpcapBpfHeader;
202 /* Helper macros to extract packets coming from the driver. Rounds up to the next even multiple of AIRPCAP_ALIGNMENT. */
203 #define AIRPCAP_ALIGNMENT sizeof(int)
204 #define AIRPCAP_WORDALIGN(x) (((x)+(AIRPCAP_ALIGNMENT-1))&~(AIRPCAP_ALIGNMENT-1))
212 #define AIRPCAP_ERRBUF_SIZE 512 /* < Size of the error buffer, in bytes */
214 #ifndef __AIRPCAP_DRIVER__
218 AirPcap supports two kind of 802.11 linktypes: plain 802.11 and radiotap.
220 #undef _AirpcapLinkType
221 typedef enum _AirpcapLinkType
223 AIRPCAP_LT_802_11 = 1, /* < plain 802.11 linktype. Every packet in the buffer contains the raw 802.11 frame, including MAC FCS. */
224 AIRPCAP_LT_802_11_PLUS_RADIO = 2, /* < 802.11 plus radiotap linktype. Every packet in the buffer contains a radiotap header followed by the 802.11 frame. MAC FCS is included. */
225 AIRPCAP_LT_UNKNOWN = 3, /* < Unknown linktype. You should see it only in case of error. */
226 AIRPCAP_LT_802_11_PLUS_PPI = 4 /* < 802.11 plus PPI header linktype. Every packet in the buffer contains a PPI header followed by the 802.11 frame. MAC FCS is included. */
227 }AirpcapLinkType, *PAirpcapLinkType;
229 #if !defined(AIRPCAP_HANDLE__EAE405F5_0171_9592_B3C2_C19EC426AD34__DEFINED_)
230 #define AIRPCAP_HANDLE__EAE405F5_0171_9592_B3C2_C19EC426AD34__DEFINED_
232 \brief Adapter handle.
234 typedef struct _AirpcapHandle AirpcapHandle, *PAirpcapHandle;
238 \brief Capture statistics.
239 Returned by \ref AirpcapGetStats();
241 typedef struct _AirpcapStats
243 guint Recvs; /* < Number of packets that the driver received by the adapter */
244 /* < from the beginning of the current capture. This value includes the packets */
245 /* < dropped because of buffer full. */
246 guint Drops; /* < number of packets that the driver dropped from the beginning of a capture. */
247 /* < A packet is lost when the the buffer of the driver is full. */
248 guint IfDrops; /* < Packets dropped by the card before going to the USB bus. */
249 /* < Not supported at the moment. */
250 guint Capt; /* < number of packets that pass the BPF filter, find place in the kernel buffer and */
251 /* < therefore reach the application. */
252 }AirpcapStats, *PAirpcapStats;
255 \brief Channel information.
256 Used by \ref AirpcapSetDeviceChannelEx(), \ref AirpcapGetDeviceChannelEx(), \ref AirpcapGetDeviceSupportedChannels()
258 typedef struct _AirpcapChannelInfo
260 guint Frequency; /* < Channel frequency, in MHz. */
262 \brief 802.11n specific. Offset of the extension channel in case of 40MHz channels.
264 Possible values are -1, 0 +1:
265 - -1 means that the extension channel should be below the control channel (e.g. Control = 5 and Extension = 1)
266 - 0 means that no extension channel should be used (20MHz channels or legacy mode)
267 - +1 means that the extension channel should be above the control channel (e.g. Control = 1 and Extension = 5)
269 In case of 802.11a/b/g channels (802.11n legacy mode), this field should be set to 0.
272 guint8 Reserved[3]; /* < Reserved. It should be set to {0,0,0}. */
274 AirpcapChannelInfo, *PAirpcapChannelInfo;
279 /** @defgroup airpcapfuncs AirPcap functions
284 \brief Return a string with the API version
285 \param VersionMajor Pointer to a variable that will be filled with the major version number.
286 \param VersionMinor Pointer to a variable that will be filled with the minor version number.
287 \param VersionRev Pointer to a variable that will be filled with the revision number.
288 \param VersionBuild Pointer to a variable that will be filled with the build number.
290 void AirpcapGetVersion(guint * VersionMajor, guint * VersionMinor, guint * VersionRev, guint * VersionBuild);
293 \brief Return the last error related to the specified handle
294 \param AdapterHandle Handle to an open adapter.
295 \return The string with the last error.
297 gchar * AirpcapGetLastError(PAirpcapHandle AdapterHandle);
300 \brief Return the list of available devices
301 \param PPAllDevs Address to a caller allocated pointer. On success this pointer will receive the head of a list of available devices.
302 \param Ebuf String that will contain error information if FALSE is returned. The size of the string must be AIRPCAP_ERRBUF_SIZE bytes.
303 \return TRUE on success. FALSE is returned on failure, in which case Ebuf is filled in with an appropriate error message.
305 Here's a snippet of code that shows how to use AirpcapGetDeviceList():
308 gchar Ebuf[AIRPCAP_ERRBUF_SIZE];
309 AirpcapDeviceDescription *Desc, *tDesc;
311 if(AirpcapGetDeviceList(&Desc, Ebuf) == -1)
313 printf("Unable to get the list of devices: %s\n", Ebuf);
317 for(tDesc = Desc; tDesc; tDesc = tDesc->next)
319 printf("%u) %s (%s)\n",
325 AirpcapFreeDeviceList(Desc);
328 gboolean AirpcapGetDeviceList(PAirpcapDeviceDescription *PPAllDevs, gchar * Ebuf);
331 \brief Free a list of devices returned by AirpcapGetDeviceList()
332 \param PAllDevs Head of the list of devices returned by \ref AirpcapGetDeviceList().
334 void AirpcapFreeDeviceList(PAirpcapDeviceDescription PAllDevs);
337 \brief Open an adapter
338 \param DeviceName Name of the device to open. Use \ref AirpcapGetDeviceList() to get the list of devices.
339 \param Ebuf String that will contain error information in case of failure. The size of the string must be AIRPCAP_ERRBUF_SIZE bytes.
340 \return A PAirpcapHandle handle on success. NULL is returned on failure, in which case Ebuf is filled in with an appropriate error message.
342 PAirpcapHandle AirpcapOpen(gchar * DeviceName, gchar * Ebuf);
345 \brief Close an adapter
346 \param AdapterHandle Handle to the adapter to close.
348 void AirpcapClose(PAirpcapHandle AdapterHandle);
351 \brief Sets the monitor mode for the specified adapter
352 \param AdapterHandle Handle to the adapter.
353 \param MonitorModeEnabled If TRUE, the adapter will be put in monitor mode. If FALSE, the adapter will be configured
354 for normal operation.
355 \return TRUE on success.
357 When monitor mode is on, the adapter captures all the packets transmitted on the channel. This includes:
362 - control and management packets
364 When monitor mode is off, the adapter has a filter on unicast packets to capture only the packets whose MAC
365 destination address equals to the adapter's address. This means the following frames will be received:
367 - unicast packets with the address of the adapter
370 - beacons and probe requests
372 The main reason to turn monitor mode off is that, when not in monitor mode, the adapter will acknowledge the
373 data frames sent to its address. This is useful when the adapter needs to interact with other devices on the
374 802.11 network, because handling the ACKs in software is too slow.
376 \note When an adapter is plugged into the system, it's always configured with monitor mode ON. The monitor mode
377 configuration is not stored persistently, so if you want to turn monitor mode off, you will need to do it
378 every time you open the adapter.
380 gboolean AirpcapSetMonitorMode(PAirpcapHandle AdapterHandle, gboolean MonitorModeEnabled);
383 \brief Returns TRUE if the specified adapter is in monitor mode.
384 \param AdapterHandle Handle to the adapter.
385 \param PMonitorModeEnabled User-provided variable that will be set to true if the adapter is in monitor mode.
386 \return TRUE if the operation is successful. FALSE otherwise.
388 \note When an adapter is plugged into the system, it's always configured with monitor mode ON. The monitor mode
389 configuration is not stored persistently, so if you want to turn monitor mode off, you will need to do it
390 every time you open the adapter.
392 gboolean AirpcapGetMonitorMode(PAirpcapHandle AdapterHandle, gboolean * PMonitorModeEnabled);
395 \brief Set the link type of an adapter
396 \param AdapterHandle Handle to the adapter.
397 \param NewLinkType the "link type", i.e. the format of the frames that will be received from the adapter.
398 \return TRUE on success.
400 the "link type" determines how the driver will encode the packets captured from the network.
401 Aircap supports two link types:
402 - \ref AIRPCAP_LT_802_11, to capture 802.11 frames (including control frames) without any
403 power information. Look at the Capture_no_radio example application in the developer's pack
404 for a reference on how to decode 802.11 frames with this link type.
405 - \ref AIRPCAP_LT_802_11_PLUS_RADIO, to capture 802.11 frames (including control frames) with a radiotap header
406 that contains power and channel information. More information about the radiotap header can be found in the
407 radiotap section. Moreover, the "Capture_radio" example application in
408 the developer's pack can be used as a reference on how to decode 802.11 frames with radiotap headers.
409 - \ref AIRPCAP_LT_802_11_PLUS_PPI, to capture 802.11 frames (including control frames) with a Per Packet Information (PPI)
410 header that contains per-packet meta information like channel and power information. More details on the PPI header can
411 be found in the PPI online documentation (TODO).
413 gboolean AirpcapSetLinkType(PAirpcapHandle AdapterHandle, AirpcapLinkType NewLinkType);
416 \brief Get the link type of the specified adapter
417 \param AdapterHandle Handle to the adapter.
418 \param PLinkType Pointer to a caller allocated AirpcapLinkType variable that will contain the link type of the adapter.
419 \return TRUE on success.
421 the "link type" determines how the driver will encode the packets captured from the network.
422 Aircap supports two link types:
423 - AIRPCAP_LT_802_11, to capture 802.11 frames (including control frames) without any
424 power information. Look at the Capture_no_radio example application in the developer's pack
425 for a reference on how to decode 802.11 frames with this link type.
426 - AIRPCAP_LT_802_11_PLUS_RADIO, to capture 802.11 frames (including control frames) with a radiotap header
427 that contains power and channel information. More information about the radiotap header can be found int the
428 radiotap section. Moreover, the "Capture_radio" example application in
429 the developer's pack can be used as a reference on how to decode 802.11 frames with radiotap headers.
431 gboolean AirpcapGetLinkType(PAirpcapHandle AdapterHandle, PAirpcapLinkType PLinkType);
434 \brief Configures the adapter on whether to include the MAC Frame Check Sequence in the captured packets.
435 \param AdapterHandle Handle to the adapter.
436 \param IsFcsPresent TRUE if the packets should include the FCS. FALSE otherwise
437 \return TRUE on success.
439 In the default configuration, the adapter includes the FCS in the captured packets. The MAC Frame Check Sequence
440 is 4 bytes and is located at the end of the 802.11 packet, with both AIRPCAP_LT_802_11 and AIRPCAP_LT_802_11_PLUS_RADIO
442 When the FCS inclusion is turned on, and if the link type is AIRPCAP_LT_802_11_PLUS_RADIO, the radiotap header
443 that precedes each frame has two additional fields at the end: Padding and FCS. These two fields are not present
444 when FCS inclusion is off.
446 gboolean AirpcapSetFcsPresence(PAirpcapHandle AdapterHandle, gboolean IsFcsPresent);
449 \brief Returns TRUE if the specified adapter includes the MAC Frame Check Sequence in the captured packets
450 \param AdapterHandle Handle to the adapter.
451 \param PIsFcsPresent User-provided variable that will be set to true if the adapter is including the FCS.
452 \return TRUE if the operation is successful. FALSE otherwise.
454 In the default configuration, the adapter has FCS inclusion turned on. The MAC Frame Check Sequence is 4 bytes
455 and is located at the end of the 802.11 packet, with both AIRPCAP_LT_802_11 and AIRPCAP_LT_802_11_PLUS_RADIO
457 When the FCS inclusion is turned on, and if the link type is AIRPCAP_LT_802_11_PLUS_RADIO, the radiotap header
458 that precedes each frame has two additional fields at the end: Padding and FCS. These two fields are not present
459 when FCS inclusion is off.
461 gboolean AirpcapGetFcsPresence(PAirpcapHandle AdapterHandle, gboolean * PIsFcsPresent);
464 \brief Configures the adapter to accept or drop frames with an incorrect Frame Check sequence (FCS).
465 \param AdapterHandle Handle to the adapter.
466 \param ValidationType The type of validation the driver will perform. See the documentation of \ref AirpcapValidationType for details.
467 \return TRUE on success.
469 \note By default, the driver is configured in \ref AIRPCAP_VT_ACCEPT_EVERYTHING mode.
471 gboolean AirpcapSetFcsValidation(PAirpcapHandle AdapterHandle, AirpcapValidationType ValidationType);
474 \brief Checks if the specified adapter is configured to capture frames with incorrect an incorrect Frame Check Sequence (FCS).
475 \param AdapterHandle Handle to the adapter.
476 \param ValidationType Pointer to a user supplied variable that will contain the type of validation the driver will perform. See the documentation of \ref AirpcapValidationType for details.
477 \return TRUE if the operation is successful. FALSE otherwise.
479 \note By default, the driver is configured in \ref AIRPCAP_VT_ACCEPT_EVERYTHING mode.
481 gboolean AirpcapGetFcsValidation(PAirpcapHandle AdapterHandle, PAirpcapValidationType ValidationType);
484 \brief Set the list of decryption keys that the driver is going to use with the specified device.
485 \param AdapterHandle Handle an open adapter instance.
486 \param KeysCollection Pointer to a \ref PAirpcapKeysCollection structure that contains the keys to be set in the driver.
487 \return TRUE if the operation is successful. FALSE otherwise.
489 The AirPcap driver is able to use a set of decryption keys to decrypt the traffic transmitted on a specific SSID. If one of the
490 keys corresponds to the one the frame has been encrypted with, the driver will perform decryption and return the cleartext frames
493 This function allows to set the <b>adapter-specific</b> set of keys. These keys will be used by the specified adapter only,
494 and will not be used by other airpcap devices besides the specified one.
496 At this time, the only supported decryption method is WEP.
498 The keys are applied to the packets in the same order they appear in the KeysCollection structure until the packet is
499 correctly decrypted, therefore putting frequently used keys at the beginning of the structure improves performance.
501 \note: when you change the set of keys from an open capture instance, the change will be
502 immediately reflected on all the other capture instances.
504 gboolean AirpcapSetDeviceKeys(PAirpcapHandle AdapterHandle, PAirpcapKeysCollection KeysCollection);
507 \brief Returns the list of decryption keys in the driver that are currently associated with the specified device
508 \param AdapterHandle Handle to an open adapter instance.
509 \param KeysCollection User-allocated PAirpcapKeysCollection structure that will be filled with the keys.
510 \param PKeysCollectionSize \b IN: pointer to a user-allocated variable that contains the length of the KeysCollection structure, in bytes.
511 \b OUT: amount of data moved by the driver in the buffer pointed by KeysBuffer, in bytes.
512 \return TRUE if the operation is successful. If an error occurs, the return value is FALSE and KeysCollectionSize is zero.
513 If the provided buffer is too small to contain the keys, the return value is FALSE and KeysCollectionSize contains the
514 needed KeysCollection length, in bytes. If the device doesn't have any decryption key configured, the return value is TRUE, and
515 KeysCollectionSize will be zero.
517 This function returns the <b>adapter-specific</b> set of keys. These keys are used by the specified adapter only,
518 and not by other airpcap devices besides the specified one.
520 The AirPcap driver is able to use a set of decryption keys to decrypt the traffic transmitted on a specific SSID. If one of the
521 keys corresponds to the one the frame has been encrypted with, the driver will perform decryption and return the cleartext frames
523 The driver supports, for every device, multiple keys at the same time.
525 The configured decryption keys are device-specific, therefore AirpcapGetDeviceKeys() will return a different set of keys
526 when called on different devices.
528 At this time, the only supported decryption method is WEP.
530 gboolean AirpcapGetDeviceKeys(PAirpcapHandle AdapterHandle, PAirpcapKeysCollection KeysCollection, guint * PKeysCollectionSize);
533 \brief Set the global list of decryption keys that the driver is going to use with all the devices.
534 \param AdapterHandle Handle an open adapter instance.
535 \param KeysCollection Pointer to a \ref PAirpcapKeysCollection structure that contains the keys to be set in the driver.
536 \return TRUE if the operation is successful. FALSE otherwise.
538 The AirPcap driver is able to use a set of decryption keys to decrypt the traffic transmitted on a specific SSID. If one of the
539 keys corresponds to the one the frame has been encrypted with, the driver will perform decryption and return the cleartext frames
542 This function allows to set the <b>global driver</b> set of keys. These keys will be used by all the adapters plugged in
545 At this time, the only supported decryption method is WEP.
547 The keys are applied to the packets in the same order they appear in the KeysCollection structure until the packet is
548 correctly decrypted, therefore putting frequently used keys at the beginning of the structure improves performance.
550 \note: when you change the set of keys from an open capture instance, the change will be
551 immediately reflected on all the other capture instances.
553 gboolean AirpcapSetDriverKeys(PAirpcapHandle AdapterHandle, PAirpcapKeysCollection KeysCollection);
556 \brief Returns the global list of decryption keys in the driver that are associated with all the devices.
557 \param AdapterHandle Handle to an open adapter instance.
558 \param KeysCollection User-allocated PAirpcapKeysCollection structure that will be filled with the keys.
559 \param PKeysCollectionSize \b IN: pointer to a user-allocated variable that contains the length of the KeysCollection structure, in bytes.
560 \b OUT: amount of data moved by the driver in the buffer pointed by KeysBuffer, in bytes.
561 \return TRUE if the operation is successful. If an error occurs, the return value is FALSE and KeysCollectionSize is zero.
562 If the provided buffer is too small to contain the keys, the return value is FALSE and KeysCollectionSize contains the
563 needed KeysCollection length, in bytes. If the device doesn't have any decryption key configured, the return value is TRUE, and
564 KeysCollectionSize will be zero.
566 This function returns the <b>global driver</b> set of keys. These keys will be used by all the adapters plugged in
569 The AirPcap driver is able to use a set of decryption keys to decrypt the traffic transmitted on a specific SSID. If one of the
570 keys corresponds to the one the frame has been encrypted with, the driver will perform decryption and return the cleartext frames
573 At this time, the only supported decryption method is WEP.
575 gboolean AirpcapGetDriverKeys(PAirpcapHandle AdapterHandle, PAirpcapKeysCollection KeysCollection, guint * PKeysCollectionSize);
578 \brief Turns on or off the decryption of the incoming frames with the <b>adapter-specific</b> keys.
579 \param AdapterHandle Handle to the adapter.
580 \param Enable Either \ref AIRPCAP_DECRYPTION_ON or \ref AIRPCAP_DECRYPTION_OFF
581 \return TRUE on success.
583 The adapter-specific decryption keys can be configured with the \ref AirpcapSetDeviceKeys() function.
584 \note By default, the driver is configured with \ref AIRPCAP_DECRYPTION_ON.
586 gboolean AirpcapSetDecryptionState(PAirpcapHandle AdapterHandle, AirpcapDecryptionState Enable);
589 \brief Tells if this open instance is configured to perform the decryption of the incoming frames with the <b>adapter-specific</b> keys.
590 \param AdapterHandle Handle to the adapter.
591 \param PEnable Pointer to a user supplied variable that will contain the decryption configuration. See \ref PAirpcapDecryptionState for details.
592 \return TRUE if the operation is successful. FALSE otherwise.
594 The adapter-specific decryption keys can be configured with the \ref AirpcapSetDeviceKeys() function.
595 \note By default, the driver is configured with \ref AIRPCAP_DECRYPTION_ON.
597 gboolean AirpcapGetDecryptionState(PAirpcapHandle AdapterHandle, PAirpcapDecryptionState PEnable);
600 \brief Turns on or off the decryption of the incoming frames with the <b>global driver</b> set of keys.
601 \param AdapterHandle Handle to the adapter.
602 \param Enable Either \ref AIRPCAP_DECRYPTION_ON or \ref AIRPCAP_DECRYPTION_OFF
603 \return TRUE on success.
605 The global decryption keys can be configured with the \ref AirpcapSetDriverKeys() function.
606 \note By default, the driver is configured with \ref AIRPCAP_DECRYPTION_ON.
608 gboolean AirpcapSetDriverDecryptionState(PAirpcapHandle AdapterHandle, AirpcapDecryptionState Enable);
611 \brief Tells if this open instance is configured to perform the decryption of the incoming frames with the <b>global driver</b> set of keys.
612 \param AdapterHandle Handle to the adapter.
613 \param PEnable Pointer to a user supplied variable that will contain the decryption configuration. See \ref PAirpcapDecryptionState for details.
614 \return TRUE if the operation is successful. FALSE otherwise.
616 The global decryption keys can be configured with the \ref AirpcapSetDriverKeys() function.
617 \note By default, the driver is configured with \ref AIRPCAP_DECRYPTION_ON.
619 gboolean AirpcapGetDriverDecryptionState(PAirpcapHandle AdapterHandle, PAirpcapDecryptionState PEnable);
622 \brief Set the radio channel of a device
623 \param AdapterHandle Handle to the adapter.
624 \param Channel the new channel to set.
625 \return TRUE on success.
627 The list of available channels can be retrieved with \ref AirpcapGetDeviceSupportedChannels(). The default channel setting is 6.
629 \note this is a device-related function: when you change the channel from an open capture instance, the change will be
630 immediately reflected on all the other capture instances.
632 gboolean AirpcapSetDeviceChannel(PAirpcapHandle AdapterHandle, guint Channel);
635 \brief Get the radio channel of a device
636 \param AdapterHandle Handle to the adapter.
637 \param PChannel Pointer to a user-supplied variable into which the function will copy the currently configured radio channel.
638 \return TRUE on success.
640 The list of available channels can be retrieved with \ref AirpcapGetDeviceSupportedChannels(). The default channel setting is 6.
642 \note this is a device-related function: when you change the channel from an open capture instance, the change will be
643 immediately reflected on all the other capture instances.
645 gboolean AirpcapGetDeviceChannel(PAirpcapHandle AdapterHandle, guint * PChannel);
648 \brief Set the size of the kernel packet buffer for this adapter
649 \param AdapterHandle Handle to the adapter.
650 \param BufferSize New size, in bytes.
651 \return TRUE on success.
653 Every AirPcap open instance has an associated kernel buffer, whose default size is 1 Mbyte.
654 This function can be used to change the size of this buffer, and can be called at any time.
655 A bigger kernel buffer size decreases the risk of dropping packets during network bursts or when the
656 application is busy, at the cost of higher kernel memory usage.
658 \note don't use this function unless you know what you are doing. Due to caching issues and bigger non-paged
659 memory consumption, bigger buffer sizes can decrease the capture performance instead of improving it.
661 gboolean AirpcapSetKernelBuffer(PAirpcapHandle AdapterHandle, guint BufferSize);
664 \brief Get the size of the kernel packet buffer for this adapter
665 \param AdapterHandle Handle to the adapter.
666 \param PSizeBytes User-allocated variable that will be filled with the size of the kernel buffer.
667 \return TRUE on success.
669 Every AirPcap open instance has an associated kernel buffer, whose default size is 1 Mbyte.
670 This function can be used to get the size of this buffer.
672 gboolean AirpcapGetKernelBufferSize(PAirpcapHandle AdapterHandle, guint * PSizeBytes);
675 \brief Saves the configuration of the specified adapter in the registry, so that it becomes the default for this adapter.
676 \param AdapterHandle Handle to the adapter.
677 \return TRUE on success. FALSE on failure.
679 Almost all the AirPcap calls that modify the configuration (\ref AirpcapSetLinkType(), \ref AirpcapSetFcsPresence(),
680 \ref AirpcapSetFcsValidation(), \ref AirpcapSetKernelBuffer(), \ref AirpcapSetMinToCopy())
681 affect only the referenced AirPcap open instance. This means that if you do another \ref AirpcapOpen() on the same
682 adapter, the configuration changes will not be remembered, and the new adapter handle will have default configuration
685 Exceptions to this rule are the \ref AirpcapSetDeviceChannel() and \ref AirpcapSetDeviceKeys() functions: a channel change is
686 reflected on all the open instances, and remembered until the next call to \ref AirpcapSetDeviceChannel(), until the adapter
687 is unplugged, or until the machine is powered off. Same thing for the configuration of the WEP keys.
689 AirpcapStoreCurConfigAsAdapterDefault() stores the configuration of the give open instance as the default for the adapter:
690 all the instances opened in the future will have the same configuration that this adapter currently has.
691 The configuration is stored in the registry, therefore it is remembered even when the adapter is unplugged or the
692 machine is turned off. However, an adapter doesn't bring its configuration with it from machine to machine.
694 the configuration information saved in the registry includes the following parameters:
701 - Encryption Enabled/Disabled state
703 The configuration is adapter-specific. This means that changing the configuration of an adapter
704 doesn't modify the one of the other adapters that are currently used or that will be used in the future.
706 \note AirpcapStoreCurConfigAsAdapterDefault() must have exclusive access to the adapter -- it
707 will fail if more than one AirPcap handle is opened at the same time for this adapter.
708 AirpcapStoreCurConfigAsAdapterDefault() needs administrator privileges. It will fail if the calling user
709 is not a local machine administrator.
711 gboolean AirpcapStoreCurConfigAsAdapterDefault(PAirpcapHandle AdapterHandle);
714 \brief Set the BPF kernel filter for an adapter
715 \param AdapterHandle Handle to the adapter.
716 \param Instructions pointer to the first BPF instruction in the array. Corresponds to the bf_insns
717 in a bpf_program structure (see the WinPcap documentation at https://www.winpcap.org/devel.htm).
718 \param Len Number of instructions in the array pointed by the previous field. Corresponds to the bf_len in
719 a a bpf_program structure (see the WinPcap documentation at https://www.winpcap.org/devel.htm).
720 \return TRUE on success.
722 The AirPcap driver is able to perform kernel-level filtering using the standard BPF pseudo-machine format. You can read
723 the WinPcap documentation at https://www.winpcap.org/devel.htm for more details on the BPF filtering mechanism.
725 A filter can be automatically created by using the pcap_compile() function of the WinPcap API. This function
726 converts a human readable text expression with the tcpdump/libpcap syntax into a BPF program.
727 If your program doesn't link wpcap, but you need to generate the code for a particular filter, you can run WinDump
728 with the -d or -dd or -ddd flags to obtain the pseudocode.
731 gboolean AirpcapSetFilter(PAirpcapHandle AdapterHandle, void * Instructions, guint Len);
734 \brief Return the MAC address of an adapter.
735 \param AdapterHandle Handle to the adapter.
736 \param PMacAddress Pointer to a user allocated MAC address.
737 The size of this buffer needs to be at least 6 bytes.
738 \return TRUE on success.
740 gboolean AirpcapGetMacAddress(PAirpcapHandle AdapterHandle, PAirpcapMacAddress PMacAddress);
743 \brief Set the mintocopy parameter for an open adapter
744 \param AdapterHandle Handle to the adapter.
745 \param MinToCopy is the mintocopy size in bytes.
746 \return TRUE on success.
748 When the number of bytes in the kernel buffer changes from less than mintocopy bytes to greater than or equal to mintocopy bytes,
749 the read event is signalled (see \ref AirpcapGetReadEvent()). A high value for mintocopy results in poor responsiveness since the
750 driver may signal the application "long" after the arrival of the packet. And a high value results in low CPU loading
751 by minimizing the number of user/kernel context switches.
752 A low MinToCopy results in good responsiveness since the driver will signal the application close to the arrival time of
753 the packet. This has higher CPU loading over the first approach.
755 gboolean AirpcapSetMinToCopy(PAirpcapHandle AdapterHandle, guint MinToCopy);
758 \brief Gets an event that is signaled when that is signalled when packets are available in the kernel buffer (see \ref AirpcapSetMinToCopy()).
759 \param AdapterHandle Handle to the adapter.
760 \param PReadEvent Pointer to a user-supplied handle that in which the read event will be copied.
761 \return TRUE on success.
763 \note the event is signalled when at least mintocopy bytes are present in the kernel buffer (see \ref AirpcapSetMinToCopy()).
764 This event can be used by WaitForSingleObject() and WaitForMultipleObjects() to create blocking behavior when reading
765 packets from one or more adapters (see \ref AirpcapRead()).
767 gboolean AirpcapGetReadEvent(PAirpcapHandle AdapterHandle, void *** PReadEvent);
770 \brief Fills a user-provided buffer with zero or more packets that have been captured on the referenced adapter.
771 \param AdapterHandle Handle to the adapter.
772 \param Buffer pointer to the buffer that will be filled with captured packets.
773 \param BufSize size of the input buffer that will contain the packets, in bytes.
774 \param PReceievedBytes Pointer to a user supplied variable that will receive the number of bytes copied by AirpcapRead.
775 Can be smaller than BufSize.
776 \return TRUE on success.
778 802.11 frames are returned by the driver in buffers. Every 802.11 frame in the buffer is preceded by a \ref AirpcapBpfHeader structure.
779 The suggested way to use an AirPcap adapter is through the pcap API exported by wpcap.dll. If this is not
780 possible, the Capture_radio and Capture_no_radio examples in the AirPcap developer's pack show how to properly decode the
781 packets in the read buffer returned by AirpcapRead().
783 \note this function is NOT blocking. Blocking behavior can be obtained using the event returned
784 by \ref AirpcapGetReadEvent(). See also \ref AirpcapSetMinToCopy().
786 gboolean AirpcapRead(PAirpcapHandle AdapterHandle, guint8 * Buffer, guint BufSize, guint * PReceievedBytes);
789 \brief Transmits a packet.
790 \param AdapterHandle Handle to the adapter.
791 \param TxPacket Pointer to a buffer that contains the packet to be transmitted.
792 \param PacketLen Length of the buffer pointed by the TxPacket argument, in bytes.
793 \return TRUE on success.
795 The packet will be transmitted on the channel the device is currently set. To change the device adapter, use the
796 \ref AirpcapSetDeviceChannel() function.
798 If the linktype of the adapter is AIRPCAP_LT_802_11, the buffer pointed by TxPacket should contain just the 802.11
799 packet, without additional information. The packet will be transmitted at 1Mbps.
801 If the linktype of the adapter is AIRPCAP_LT_802_11_PLUS_RADIO, the buffer pointed by TxPacket should contain a radiotap
802 header followed by the 802.11 packet. AirpcapWrite will use the rate information in the radiotap header when
803 transmitting the packet.
805 gboolean AirpcapWrite(PAirpcapHandle AdapterHandle, gchar * TxPacket, guint32 PacketLen);
808 \brief Get per-adapter WinPcap-compatible capture statistics.
809 \param AdapterHandle Handle to the adapter.
810 \param PStats pointer to a user-allocated AirpcapStats structure that will be filled with statistical information.
811 \return TRUE on success.
813 gboolean AirpcapGetStats(PAirpcapHandle AdapterHandle, PAirpcapStats PStats);
816 \brief Get the number of LEDs the referenced adapter has available.
817 \param AdapterHandle Handle to the adapter.
818 \param NumberOfLeds Number of LEDs available on this adapter.
819 \return TRUE on success.
821 gboolean AirpcapGetLedsNumber(PAirpcapHandle AdapterHandle, guint * NumberOfLeds);
824 \brief Turn on one of the adapter's LEDs.
825 \param AdapterHandle Handle to the adapter.
826 \param LedNumber zero-based identifier of the LED to turn on.
827 \return TRUE on success.
829 gboolean AirpcapTurnLedOn(PAirpcapHandle AdapterHandle, guint LedNumber);
832 \brief Turn off one of the adapter's LEDs.
833 \param AdapterHandle Handle to the adapter.
834 \param LedNumber zero-based identifier of the LED to turn off.
835 \return TRUE on success.
837 gboolean AirpcapTurnLedOff(PAirpcapHandle AdapterHandle, guint LedNumber);
840 \brief Set the channel of a device through its radio frequency. In case of 802.11n enabled devices, it sets the extension channel, if used.
841 \param AdapterHandle Handle to the adapter.
842 \param ChannelInfo The new channel information to set.
843 \return TRUE on success.
845 \note this is a device-related function: when you change the channel from an open capture instance, the change will be
846 immediately reflected on all the other capture instances.
848 gboolean AirpcapSetDeviceChannelEx(PAirpcapHandle AdapterHandle, AirpcapChannelInfo ChannelInfo);
851 \brief Get the channel of a device through its radiofrequency. In case of 802.11n enabled devices, it gets the extension channel, if in use.
852 \param AdapterHandle Handle to the adapter.
853 \param PChannelInfo Pointer to a user-supplied variable into which the function will copy the currently configured channel information.
854 \return TRUE on success.
856 \note this is a device-related function: when you change the channel from an open capture instance, the change will be
857 immediately reflected on all the other capture instances.
859 gboolean AirpcapGetDeviceChannelEx(PAirpcapHandle AdapterHandle, PAirpcapChannelInfo PChannelInfo);
862 \brief Get the list of supported channels for a given device. In case of a 802.11n capable device, information related to supported extension channels is also reported.
864 Every control channel is listed multiple times, one for each different supported extension channel. For example channel 6 (2437MHz) is usually listed three times:
865 - <b>Frequency 2437 Extension +1</b>. Control channel is 6, extension channel is 10.
866 - <b>Frequency 2437 Extension 0</b>. Control channel is 6, no extension channel is used (20MHz channel and legacy mode).
867 - <b>Frequency 2437 Extension -1</b>. Control channel is 6, extension channel is 2.
868 \param AdapterHandle Handle to the adapter.
869 \param ppChannelInfo Pointer to a user-supplied variable that will point to an array of supported channel. Such list must not be freed by the caller
870 \param pNumChannelInfo Number of channels returned in the array.
871 \return TRUE on success.
873 \note The supported channels are not listed in any specific order.
875 gboolean AirpcapGetDeviceSupportedChannels(PAirpcapHandle AdapterHandle, PAirpcapChannelInfo *ppChannelInfo, guint * pNumChannelInfo);
878 \brief Converts a given frequency to the corresponding channel.
880 \param Frequency Frequency of the channel, in MHz.
881 \param PChannel Pointer to a user-supplied variable that will contain the channel number on success.
882 \param PBand Pointer to a user-supplied variable that will contain the band (a or b/g) of the given channel.
883 \return TRUE on success, i.e. the frequency corresponds to a valid a or b/g channel.
885 gboolean AirpcapConvertFrequencyToChannel(guint Frequency, guint * PChannel, PAirpcapChannelBand PBand);
888 \brief Converts a given channel to the corresponding frequency.
890 \param Channel Channel number to be converted.
891 \param PFrequency Pointer to a user-supplied variable that will contain the channel frequency in MHz on success.
892 \return TRUE on success, i.e. the given channel number exists.
894 gboolean AirpcapConvertChannelToFrequency(guint Channel, guint * PFrequency);
899 #endif /* __AIRPCAP_DRIVER__ */
905 #endif /* !defined(AIRPCAP_H__EAE405F5_0171_9592_B3C2_C19EC426AD34__INCLUDED_) */