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# airpcap.h

/*
* Copyright (c) 2006-2007 CACE Technologies, Davis (California)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

#ifdef _MSC_VER
// This disables a VS warning for zero-sized arrays.
#pragma warning( disable : 4200)
// This stops VS2005 ranting against stdio.
#pragma warning( disable : 4996)
#endif

#ifdef __cplusplus
extern "C" {
#endif

/*!
\mainpage AirPcap interface documentation

\section Introduction

This document describes the data structures and the functions exported by the CACE Technologies AirPcap library.
The AirPcap library provides low-level access to the AirPcap driver including advanced capabilities such as channel setting,
link type control and WEP configuration.<br>
This manual includes the following sections:

\note throughout this documentation, \e device refers to a physical USB AirPcap device, while \e adapter is an open API
instance. Most of the AirPcap API operations are adapter-specific but some of them, like setting the channel, are
per-device and will be reflected on all the open adapters. These functions will have "Device" in their name, e.g.
AirpcapSetDeviceChannel().

\b Sections:

- \ref airpcapfuncs
- \ref airpcapdefs
*/

/** @defgroup airpcapdefs AirPcap definitions and data structures
*  @{
*/

/*!
\brief This string is the fixed prefix in the airpcap adapter name.
It can be used to parse the name field in an AirpcapDeviceDescription structure.
*/
00066 #define AIRPCAP_DEVICE_NAME_PREFIX        "\\\\.\\airpcap"

/*!
\brief This string is the scanf modifier to extract the adapter number from an adapter name.
It can be used to parse the name field in an AirpcapDeviceDescription structure with scanf.
*/
00072 #define AIRPCAP_DEVICE_NUMBER_EXTRACT_STRING           "\\\\.\\airpcap%u"

#define AIRPCAP_DEVICE_ANY_EXTRACT_STRING "\\\\.\\airpcap_any"

/*!
\brief Entry in the list returned by \ref AirpcapGetDeviceList();
*/
00079 typedef struct _AirpcapDeviceDescription
{
00081       struct      _AirpcapDeviceDescription *next;                ///< Next element in the list
00082       PCHAR Name;                                                       ///< Device name
00083       PCHAR Description;                                                ///< Device description
} AirpcapDeviceDescription, *PAirpcapDeviceDescription;

#define MAX_ENCRYPTION_KEYS 64

00088 #define WEP_KEY_MAX_SIZE 32         ///< Maximum size of a WEP key, in bytes. This is the size of an entry in the
///< AirpcapWepKeysCollection structure

#ifndef __MINGW32__
#pragma pack(push)
#pragma pack(1)
#endif // __MINGW32__

00097 #define AIRPCAP_KEYTYPE_WEP         0     ///< Key type: WEP. The key can have an arbitrary length smaller than 32 bytes.
00098 #define AIRPCAP_KEYTYPE_TKIP  1     ///< Key type: TKIP (WPA). NOT SUPPORTED YET.
00099 #define AIRPCAP_KEYTYPE_CCMP  2     ///< Key type: CCMP (WPA2). NOT SUPPORTED YET.

/*!
\brief WEP key container
*/
00104 typedef struct _AirpcapKey
{
00106       UINT 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.
00107       UINT KeyLen;                                    ///< Length of the key, in bytes
00108       BYTE KeyData[WEP_KEY_MAX_SIZE];           ///< Key Data
}
#ifdef __MINGW32__
__attribute__((__packed__))
#endif // __MINGW32__
AirpcapKey, *PAirpcapKey;

/*!
\brief frequency Band.
802.11 adapters can support different frequency bands, the most important of which are: 2.4GHz (802.11b/g/n)
and 5GHz (802.11a/n).
*/
00120 typedef enum _AirpcapChannelBand
{
00122     AIRPCAP_CB_AUTO = 1,                        ///< Automatically pick the best frequency band
00123     AIRPCAP_CB_2_4_GHZ = 2,                     ///< 2.4 GHz frequency band
00124     AIRPCAP_CB_4_GHZ = 4,                       ///< 4 GHz frequency band
00125     AIRPCAP_CB_5_GHZ = 5                        ///< 5 GHz frequency band
}AirpcapChannelBand, *PAirpcapChannelBand;

/*!
\brief Type of frame validation the adapter performs.
An adapter can be instructed to accept different kind of frames: correct frames only, frames with wrong Frame Check Sequence (FCS) only, all frames.
*/
00132 typedef enum _AirpcapValidationType
{
00134     AIRPCAP_VT_ACCEPT_EVERYTHING = 1,           ///< Accept all the frames the device captures
00135     AIRPCAP_VT_ACCEPT_CORRECT_FRAMES = 2, ///< Accept correct frames only, i.e. frames with correct Frame Check Sequence (FCS).
00136     AIRPCAP_VT_ACCEPT_CORRUPT_FRAMES = 3, ///< Accept corrupt frames only, i.e. frames with worng Frame Check Sequence (FCS).
00137       AIRPCAP_VT_UNKNOWN = 4                          ///< Unknown validation type. You should see it only in case of error.
}AirpcapValidationType, *PAirpcapValidationType;

/*!
\brief Type of decryption the adapter performs.
An adapter can be instructed to turn decryption (based on the device-configured keys configured
with \ref AirpcapSetDeviceKeys()) on or off.
*/
00145 typedef enum _AirpcapDecryptionState
{
00147     AIRPCAP_DECRYPTION_ON = 1,                        ///< This adapter performs decryption
00148     AIRPCAP_DECRYPTION_OFF = 2                        ///< This adapter does not perform decryption
}AirpcapDecryptionState, *PAirpcapDecryptionState;

/*!
\brief Storage for a MAC address
*/
{
}
#ifdef __MINGW32__
__attribute__((__packed__))
#endif // __MINGW32__

/*!
\brief This structure is used to store a collection of WEP keys.
Note that the definition of the structure doesn't contain any key, so be careful to allocate a buffer
with the size of the key, like in the following example:

\code
PAirpcapKeysCollection KeysCollection;
UINT KeysCollectionSize;

KeysCollectionSize = sizeof(AirpcapKeysCollection) + NumKeys * sizeof(AirpcapKey);

KeysCollection = (PAirpcapKeysCollection)malloc(KeysCollectionSize);
if(!KeysCollection)
{
// Error
}
\endcode
*/
00182 typedef struct _AirpcapKeysCollection
{
00184       UINT nKeys;                                                                   ///< Number of keys in the collection
00185       AirpcapKey Keys[0];                                                           ///< Array of nKeys keys.
} AirpcapKeysCollection, *PAirpcapKeysCollection;

/*!

This structure defines the BPF that preceeds every packet delivered to the application.
*/
{
00195       UINT TsSec;             ///< Timestamp associated with the captured packet. SECONDS.
00196       UINT TsUsec;            ///< Timestamp associated with the captured packet. MICROSECONDS.
00197       UINT 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.
00198       UINT Originallen; ///< Original length of packet
00199       USHORT      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.
}
#ifdef __MINGW32__
__attribute__((__packed__))
#endif // __MINGW32__

/// Helper macros to extract packets coming from the driver. Rounds up to the next even multiple of AIRPCAP_ALIGNMENT.
00207 #define AIRPCAP_ALIGNMENT sizeof(int)
#define AIRPCAP_WORDALIGN(x) (((x)+(AIRPCAP_ALIGNMENT-1))&~(AIRPCAP_ALIGNMENT-1))

#ifndef __MINGW32__
#pragma pack(pop)
#endif // __MINGW32__

00214 #define AIRPCAP_ERRBUF_SIZE 512           ///< Size of the error buffer, in bytes

#ifndef __AIRPCAP_DRIVER__

/*!
*/
{
00225     AIRPCAP_LT_802_11 = 1,                      ///< plain 802.11 linktype. Every packet in the buffer contains the raw 802.11 frame, including MAC FCS.
00227       AIRPCAP_LT_UNKNOWN = 3,                   ///< Unknown linktype. You should see it only in case of error.
00228       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.

/*!
*/
00236 typedef struct _AirpcapHandle AirpcapHandle, *PAirpcapHandle;
#endif

/*!
\brief Capture statistics.
Returned by \ref AirpcapGetStats();
*/
00243 typedef struct _AirpcapStats
{
00245       UINT Recvs;             ///< Number of packets that the driver received by the adapter
///< from the beginning of the current capture. This value includes the packets
///< dropped because of buffer full.
00248       UINT Drops;             ///< number of packets that the driver dropped from the beginning of a capture.
///< A packet is lost when the the buffer of the driver is full.
00250       UINT IfDrops;           ///< Packets dropped by the card before going to the USB bus.
///< Not supported at the moment.
00252       UINT Capt;              ///< number of packets that pass the BPF filter, find place in the kernel buffer and
///< therefore reach the application.
}AirpcapStats, *PAirpcapStats;

/*!
\brief Channel information.
Used by \ref AirpcapSetDeviceChannelEx(), \ref AirpcapGetDeviceChannelEx(), \ref AirpcapGetDeviceSupportedChannels()
*/
00260 typedef struct _AirpcapChannelInfo
{
00262       UINT Frequency;   ///< Channel frequency, in MHz.
/*!
\brief 802.11n specific. Offset of the extension channel in case of 40MHz channels.

Possible values are -1, 0 +1:
- -1 means that the extension channel should be below the control channel (e.g. Control = 5 and Extension = 1)
- 0 means that no extension channel should be used (20MHz channels or legacy mode)
- +1 means that the extension channel should be above the control channel (e.g. Control = 1 and Extension = 5)

In case of 802.11a/b/g channels (802.11n legacy mode), this field should be set to 0.
*/
00273       CHAR ExtChannel;
00274       UCHAR Reserved[3];      ///< Reserved. It should be set to {0,0,0}.
}
AirpcapChannelInfo, *PAirpcapChannelInfo;

/*@}*/

/** @defgroup airpcapfuncs AirPcap functions
*  @{
*/

/*!
\brief Return a string with the API version
\param VersionMajor Pointer to a variable that will be filled with the major version number.
\param VersionMinor Pointer to a variable that will be filled with the minor version number.
\param VersionRev Pointer to a variable that will be filled with the revision number.
\param VersionBuild Pointer to a variable that will be filled with the build number.
*/
void AirpcapGetVersion(PUINT VersionMajor, PUINT VersionMinor, PUINT VersionRev, PUINT VersionBuild);

/*!
\brief Return the last error related to the specified handle
\return The string with the last error.
*/

/*!
\brief Return the list of available devices
\param PPAllDevs Address to a caller allocated pointer. On success this pointer will receive the head of a list of available devices.
\param Ebuf String that will contain error information if FALSE is returned. The size of the string must be AIRPCAP_ERRBUF_SIZE bytes.
\return TRUE on success. FALSE is returned on failure, in which case Ebuf is filled in with an appropriate error message.

Here's a snippet of code that shows how to use AirpcapGetDeviceList():

\code
CHAR Ebuf[AIRPCAP_ERRBUF_SIZE];
AirpcapDeviceDescription *Desc, *tDesc;

if(AirpcapGetDeviceList(&Desc, Ebuf) == -1)
{
printf("Unable to get the list of devices: %s\n", Ebuf);
return -1;
}

for(tDesc = Desc; tDesc; tDesc = tDesc->next)
{
printf("%u) %s (%s)\n",
++i,
tDesc->Name,
tDesc->Description);
}

AirpcapFreeDeviceList(Desc);
\endcode
*/
BOOL AirpcapGetDeviceList(PAirpcapDeviceDescription *PPAllDevs, PCHAR Ebuf);

/*!
\brief Free a list of devices returned by AirpcapGetDeviceList()
\param PAllDevs Head of the list of devices returned by \ref AirpcapGetDeviceList().
*/
VOID AirpcapFreeDeviceList(PAirpcapDeviceDescription PAllDevs);

/*!
\param DeviceName Name of the device to open. Use \ref AirpcapGetDeviceList() to get the list of devices.
\param Ebuf String that will contain error information in case of failure. The size of the string must be AIRPCAP_ERRBUF_SIZE bytes.
\return A PAirpcapHandle handle on success. NULL is returned on failure, in which case Ebuf is filled in with an appropriate error message.
*/
PAirpcapHandle AirpcapOpen(PCHAR DeviceName, PCHAR Ebuf);

/*!
*/

/*!
\brief Sets the monitor mode for the specified adapter
\param MonitorModeEnabled If TRUE, the adapter will be put in monitor mode. If FALSE, the adapter will be configured
for normal operation.
\return TRUE on success.

When monitor mode is on, the adapter captures all the packets transmitted on the channel. This includes:

- unicast packets
- multicast packets
- control and management packets

When monitor mode is off, the adapter has a filter on unicast packets to capture only the packets whose MAC

- multicast packets
- beacons and probe requests

The main reason to turn monitor mode off is that, when not in monitor mode, the adapter will acknowledge the
data frames sent to its address. This is useful when the adapter needs to interact with other devices on the
802.11 network, bacause handling the ACKs in software is too slow.

\note When an adapter is plugged into the system, it's always configured with monitor mode ON. The monitor mode
configuration is not stored persistently, so if you want to turn monitor mode off, you will need to do it
every time you open the adapter.
*/

/*!
\brief Returns TRUE if the specified adapter is in monitor mode.
\param PMonitorModeEnabled User-provided variable that will be set to true if the adapter is in monitor mode.
\return TRUE if the operation is successful. FALSE otherwise.

\note When an adapter is plugged into the system, it's always configured with monitor mode ON. The monitor mode
configuration is not stored persistently, so if you want to turn monitor mode off, you will need to do it
every time you open the adapter.
*/

/*!
\return TRUE on success.

the "link type" determines how the driver will encode the packets captured from the network.
- \ref AIRPCAP_LT_802_11, to capture 802.11 frames (including control frames) without any
power information. Look at the Capture_no_radio example application in the developer's pack
for a reference on how to decode 802.11 frames with this link type.
the developer's pack can be used as a reference on how to decode 802.11 frames with radiotap headers.
- \ref AIRPCAP_LT_802_11_PLUS_PPI, to capture 802.11 frames (including control frames) with a Per Packet Information (PPI)
header that contains per-packet meta information like channel and power information. More details on the PPI header can
be founf in the PPI online documentation (TODO).
*/

/*!
\return TRUE on success.

the "link type" determines how the driver will encode the packets captured from the network.
- AIRPCAP_LT_802_11, to capture 802.11 frames (including control frames) without any
power information. Look at the Capture_no_radio example application in the developer's pack
for a reference on how to decode 802.11 frames with this link type.
the developer's pack can be used as a reference on how to decode 802.11 frames with radiotap headers.
*/

/*!
\brief Configures the adapter on whether to include the MAC Frame Check Sequence in the captured packets.
\param IsFcsPresent TRUE if the packets should include the FCS. FALSE otherwise
\return TRUE on success.

In the default configuration, the adapter includes the FCS in the captured packets. The MAC Frame Check Sequence
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
that precedes each frame has two additional fields at the end: Padding and FCS. These two fields are not present
when FCS inclusion is off.
*/

/*!
\brief Returns TRUE if the specified adapter includes the MAC Frame Check Sequence in the captured packets
\param PIsFcsPresent User-provided variable that will be set to true if the adapter is including the FCS.
\return TRUE if the operation is successful. FALSE otherwise.

In the default configuration, the adatper has FCS inclusion turned on. The MAC Frame Check Sequence 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
that precedes each frame has two additional fields at the end: Padding and FCS. These two fields are not present
when FCS inclusion is off.
*/

/*!
\brief Configures the adapter to accept or drop frames with an incorrect Frame Check sequence (FCS).
\param ValidationType The type of validation the driver will perform. See the documentation of \ref AirpcapValidationType for details.
\return TRUE on success.

\note By default, the driver is configured in \ref AIRPCAP_VT_ACCEPT_EVERYTHING mode.
*/

/*!
\brief Checks if the specified adapter is configured to capture frames with incorrect an incorrect Frame Check Sequence (FCS).
\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.
\return TRUE if the operation is succesful. FALSE otherwise.

\note By default, the driver is configured in \ref AIRPCAP_VT_ACCEPT_EVERYTHING mode.
*/

/*!
\brief Set the list of decryption keys that the driver is going to use with the specified device.
\param KeysCollection Pointer to a \ref PAirpcapKeysCollection structure that contains the keys to be set in the driver.
\return TRUE if the operation is successful. FALSE otherwise.

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
keys corresponds to the one the frame has been encrypted with, the driver will perform decryption and return the cleartext frames
to the application.

This function allows to set the <b>adapter-specific</b> set of keys. These keys will be used by the specified adapter only,
and will not be used by other airpcap devices besides the specified one.

At this time, the only supported decryption method is WEP.

The keys are applied to the packets in the same order they appear in the KeysCollection structure until the packet is
correctly decrypted, therefore putting frequently used keys at the beginning of the structure improves performance.

\note: when you change the set of keys from an open capture instance, the change will be
immediately reflected on all the other capture instances.
*/

/*!
\brief Returns the list of decryption keys in the driver that are currently associated with the specified device
\param KeysCollection User-allocated PAirpcapKeysCollection structure that will be filled with the keys.
\param PKeysCollectionSize \b IN: pointer to a user-allocated variable that contains the length of the KeysCollection structure, in bytes.
\b OUT: amount of data moved by the driver in the buffer pointed by KeysBuffer, in bytes.
\return TRUE if the operation is succesful. If an error occurs, the return value is FALSE and KeysCollectionSize is zero.
If the provided buffer is too small to contain the keys, the return value is FALSE and KeysCollectionSize contains the
needed KeysCollection length, in bytes. If the device doesn't have any decryption key configured, the return value is TRUE, and
KeysCollectionSize will be zero.

This function returns the <b>adapter-specific</b> set of keys. These keys are used by the specified adapter only,
and not by other airpcap devices besides the specified one.

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
keys corresponds to the one the frame has been encrypted with, the driver will perform decryption and return the cleartext frames
to the application.
The driver supports, for every device, multiple keys at the same time.

The configured decryption keys are device-specific, therefore AirpcapGetDeviceKeys() will return a different set of keys
when called on different devices.

At this time, the only supported decryption method is WEP.
*/
BOOL AirpcapGetDeviceKeys(PAirpcapHandle AdapterHandle, PAirpcapKeysCollection KeysCollection, PUINT PKeysCollectionSize);

/*!
\brief Set the global list of decryption keys that the driver is going to use with all the devices.
\param KeysCollection Pointer to a \ref PAirpcapKeysCollection structure that contains the keys to be set in the driver.
\return TRUE if the operation is successful. FALSE otherwise.

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
keys corresponds to the one the frame has been encrypted with, the driver will perform decryption and return the cleartext frames
to the application.

This function allows to set the <b>global driver</b> set of keys. These keys will be used by all the adapters plugged in
the machine.

At this time, the only supported decryption method is WEP.

The keys are applied to the packets in the same order they appear in the KeysCollection structure until the packet is
correctly decrypted, therefore putting frequently used keys at the beginning of the structure improves performance.

\note: when you change the set of keys from an open capture instance, the change will be
immediately reflected on all the other capture instances.
*/

/*!
\brief Returns the global list of decryption keys in the driver that are associated with all the devices.
\param KeysCollection User-allocated PAirpcapKeysCollection structure that will be filled with the keys.
\param PKeysCollectionSize \b IN: pointer to a user-allocated variable that contains the length of the KeysCollection structure, in bytes.
\b OUT: amount of data moved by the driver in the buffer pointed by KeysBuffer, in bytes.
\return TRUE if the operation is succesful. If an error occurs, the return value is FALSE and KeysCollectionSize is zero.
If the provided buffer is too small to contain the keys, the return value is FALSE and KeysCollectionSize contains the
needed KeysCollection length, in bytes. If the device doesn't have any decryption key configured, the return value is TRUE, and
KeysCollectionSize will be zero.

This function returns the <b>global driver</b> set of keys. These keys will be used by all the adapters plugged in
the machine.

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
keys corresponds to the one the frame has been encrypted with, the driver will perform decryption and return the cleartext frames
to the application.

At this time, the only supported decryption method is WEP.
*/
BOOL AirpcapGetDriverKeys(PAirpcapHandle AdapterHandle, PAirpcapKeysCollection KeysCollection, PUINT PKeysCollectionSize);

/*!
\brief Turns on or off the decryption of the incoming frames with the <b>adapter-specific</b> keys.
\param Enable Either \ref AIRPCAP_DECRYPTION_ON or \ref AIRPCAP_DECRYPTION_OFF
\return TRUE on success.

The adapter-specific decryption keys can be configured with the \ref AirpcapSetDeviceKeys() function.
\note By default, the driver is configured with \ref AIRPCAP_DECRYPTION_ON.
*/

/*!
\brief Tells if this open instance is configured to perform the decryption of the incoming frames with the <b>adapter-specific</b> keys.
\param PEnable Pointer to a user supplied variable that will contain the decryption configuration. See \ref PAirpcapDecryptionState for details.
\return TRUE if the operation is succesful. FALSE otherwise.

The adapter-specific decryption keys can be configured with the \ref AirpcapSetDeviceKeys() function.
\note By default, the driver is configured with \ref AIRPCAP_DECRYPTION_ON.
*/

/*!
\brief Turns on or off the decryption of the incoming frames with the <b>global driver</b> set of keys.
\param Enable Either \ref AIRPCAP_DECRYPTION_ON or \ref AIRPCAP_DECRYPTION_OFF
\return TRUE on success.

The global decryption keys can be configured with the \ref AirpcapSetDriverKeys() function.
\note By default, the driver is configured with \ref AIRPCAP_DECRYPTION_ON.
*/

/*!
\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.
\param PEnable Pointer to a user supplied variable that will contain the decryption configuration. See \ref PAirpcapDecryptionState for details.
\return TRUE if the operation is succesful. FALSE otherwise.

The global decryption keys can be configured with the \ref AirpcapSetDriverKeys() function.
\note By default, the driver is configured with \ref AIRPCAP_DECRYPTION_ON.
*/

/*!
\brief Set the radio channel of a device
\param Channel the new channel to set.
\return TRUE on success.

The list of available channels can be retrieved with \ref AirpcapGetDeviceSupportedChannels(). The default channel setting is 6.

\note this is a device-related function: when you change the channel from an open capture instance, the change will be
immediately reflected on all the other capture instances.
*/

/*!
\brief Get the radio channel of a device
\param PChannel Pointer to a user-supplied variable into which the function will copy the currently configured radio channel.
\return TRUE on success.

The list of available channels can be retrieved with \ref AirpcapGetDeviceSupportedChannels(). The default channel setting is 6.

\note this is a device-related function: when you change the channel from an open capture instance, the change will be
immediately reflected on all the other capture instances.
*/

/*!
\brief Set the size of the kernel packet buffer for this adapter
\param BufferSize New size, in bytes.
\return TRUE on success.

Every AirPcap open instance has an associated kernel buffer, whose default size is 1 Mbyte.
This function can be used to change the size of this buffer, and can be called at any time.
A bigger kernel buffer size decreases the risk of dropping packets during network bursts or when the
application is busy, at the cost of higher kernel memory usage.

\note don't use this function unless you know what you are doing. Due to caching issues and bigger non-paged
memory consumption, bigger buffer sizes can decrease the capture performace instead of improving it.
*/

/*!
\brief Get the size of the kernel packet buffer for this adapter
\param PSizeBytes User-allocated variable that will be filled with the size of the kernel buffer.
\return TRUE on success.

Every AirPcap open instance has an associated kernel buffer, whose default size is 1 Mbyte.
This function can be used to get the size of this buffer.
*/

/*!
\brief Saves the configuration of the specified adapter in the registry, so that it becomes the default for this adapter.
\return TRUE on success. FALSE on failure.

Almost all the AirPcap calls that modify the configuration (\ref AirpcapSetLinkType(), \ref AirpcapSetFcsPresence(),
\ref AirpcapSetFcsValidation(), \ref AirpcapSetKernelBuffer(), \ref AirpcapSetMinToCopy())
affect only the referenced AirPcap open instance. This means that if you do another \ref AirpcapOpen() on the same
adapter, the configuration changes will not be remembered, and the new adapter handle will have default configuration
settings.

Exceptions to this rule are the \ref AirpcapSetDeviceChannel() and \ref AirpcapSetDeviceKeys() functions: a channel change is
reflected on all the open instances, and remembered until the next call to \ref AirpcapSetDeviceChannel(), until the adapter
is unplugged, or until the machine is powered off. Same thing for the configuration of the WEP keys.

AirpcapStoreCurConfigAsAdapterDefault() stores the configuration of the give open instance as the default for the adapter:
all the instances opened in the future will have the same configuration that this adapter currently has.
The configuration is stored in the registry, therefore it is remembered even when the adapter is unplugged or the
machine is turned off. However, an adapter doesn't bring its configuration with it from machine to machine.

the configuration information saved in the registry includes the following parameters:
- channel
- kernel buffer size
- mintocopy
- CRC presence
- Encryption keys
- Encryption Enabled/Disabled state

The configuration is adapter-specific. This means that changing the configuration of an adapter
doesn't modify the one of the other adapters that are currently used or that will be used in the future.

will fail if more than one AirPcap handle is opened at the same time for this adapter.
is not a local machine administrator.
*/

/*!
\brief Set the BPF kernel filter for an adapter
\param Instructions pointer to the first BPF instruction in the array. Corresponds to the  bf_insns
in a bpf_program structure (see the WinPcap documentation at http://www.winpcap.org/devel.htm).
\param Len Number of instructions in the array pointed by the previous field. Corresponds to the bf_len in
a a bpf_program structure (see the WinPcap documentation at http://www.winpcap.org/devel.htm).
\return TRUE on success.

The AirPcap driver is able to perform kernel-level filtering using the standard BPF pseudo-machine format. You can read
the WinPcap documentation at http://www.winpcap.org/devel.htm for more details on the BPF filtering mechaism.

A filter can be automatically created by using the pcap_compile() function of the WinPcap API. This function
converts a human readable text expression with the tcpdump/libpcap syntax into a BPF program.
If your program doesn't link wpcap, but you need to generate the code for a particular filter, you can run WinDump
with the -d or -dd or -ddd flags to obtain the pseudocode.

*/
BOOL AirpcapSetFilter(PAirpcapHandle AdapterHandle, PVOID Instructions, UINT Len);

/*!
The size of this buffer needs to be at least 6 bytes.
\return TRUE on success.
*/

/*!
\brief Set the mintocopy parameter for an open adapter
\param MinToCopy is the mintocopy size in bytes.
\return TRUE on success.

When the number of bytes in the kernel buffer changes from less than mintocopy bytes to greater than or equal to mintocopy bytes,
the read event is signalled (see \ref AirpcapGetReadEvent()). A high value for mintocopy results in poor responsiveness since the
driver may signal the application "long" after the arrival of the packet. And a high value results in low CPU loading
by minimizing the number of user/kernel context switches.
A low MinToCopy results in good responsiveness since the driver will signal the application close to the arrival time of
*/

/*!
\brief Gets an event that is signaled when that is signalled when packets are available in the kernel buffer (see \ref AirpcapSetMinToCopy()).
\param PReadEvent Pointer to a user-supplied handle that in which the read event will be copied.
\return TRUE on success.

\note the event is signalled when at least mintocopy bytes are present in the kernel buffer (see \ref AirpcapSetMinToCopy()).
This event can be used by WaitForSingleObject() and WaitForMultipleObjects() to create blocking behavior when reading
*/

/*!
\brief Fills a user-provided buffer with zero or more packets that have been captured on the referenced adapter.
\param Buffer pointer to the buffer that will be filled with captured packets.
\param BufSize size of the input buffer that will contain the packets, in bytes.
\param PReceievedBytes Pointer to a user supplied variable that will receive the number of bytes copied by AirpcapRead.
Can be smaller than BufSize.
\return TRUE on success.

802.11 frames are returned by the driver in buffers. Every 802.11 frame in the buffer is preceded by a \ref AirpcapBpfHeader structure.
The suggested way to use an AirPcap adapter is through the pcap API exported by wpcap.dll. If this is not
possible, the Capture_radio and Capture_no_radio examples in the AirPcap developer's pack show how to properly decode the

\note this function is NOT blocking. Blocking behavior can be obtained using the event returned
*/

/*!
\brief Transmits a packet.
\param TxPacket Pointer to a buffer that contains the packet to be transmitted.
\param PacketLen Length of the buffer pointed by the TxPacket argument, in bytes.
\return TRUE on success.

The packet will be transmitted on the channel the device is currently set. To change the device adapter, use the
\ref AirpcapSetDeviceChannel() function.

If the linktype of the adapter is AIRPCAP_LT_802_11, the buffer pointed by TxPacket should contain just the 802.11
packet, without additional information. The packet will be transmitted at 1Mbps.

header followed by the 802.11 packet. AirpcapWrite will use the rate information in the radiotap header when
transmitting the packet.
*/
BOOL AirpcapWrite(PAirpcapHandle AdapterHandle, PCHAR TxPacket, ULONG PacketLen);

/*!
\brief Get per-adapter WinPcap-compatible capture statistics.
\param PStats pointer to a user-allocated AirpcapStats structure that will be filled with statistical information.
\return TRUE on success.
*/

/*!
\brief Get the number of LEDs the referenced adapter has available.
\param NumberOfLeds Number of LEDs available on this adapter.
\return TRUE on success.
*/

/*!
\brief Turn on one of the adapter's LEDs.
\param LedNumber zero-based identifier of the LED to turn on.
\return TRUE on success.
*/

/*!
\brief Turn off one of the adapter's LEDs.
\param LedNumber zero-based identifier of the LED to turn off.
\return TRUE on success.
*/

/*!
\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.
\param ChannelInfo The new channel information to set.
\return TRUE on success.

\note this is a device-related function: when you change the channel from an open capture instance, the change will be
immediately reflected on all the other capture instances.
*/

/*!
\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.
\param PChannelInfo Pointer to a user-supplied variable into which the function will copy the currently configured channel information.
\return TRUE on success.

\note this is a device-related function: when you change the channel from an open capture instance, the change will be
immediately reflected on all the other capture instances.
*/

/*!
\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.

Every control channel is listed multiple times, one for each different supported extension channel. For example channel 6 (2437MHz)  is usually listed three times:
- <b>Frequency 2437 Extension +1</b>. Control channel is 6, extension channel is 10.
- <b>Frequency 2437 Extension 0</b>. Control channel is 6, no extension channel is used (20MHz channel and legacy mode).
- <b>Frequency 2437 Extension -1</b>. Control channel is 6, extension channel is 2.
\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
\param pNumChannelInfo Number of channels returned in the array.
\return TRUE on success.

\note The supported channels are not listed in any specific order.
*/
BOOL AirpcapGetDeviceSupportedChannels(PAirpcapHandle AdapterHandle, PAirpcapChannelInfo *ppChannelInfo, PUINT pNumChannelInfo);

/*!
\brief Converts a given frequency to the corresponding channel.

\param Frequency Frequency of the channel, in MHz.
\param PChannel Pointer to a user-supplied variable that will contain the channel number on success.
\param PBand Pointer to a user-supplied variable that will contain the band (a or b/g) of the given channel.
\return TRUE on success, i.e. the frequency corresponds to a valid a or b/g channel.
*/
BOOL AirpcapConvertFrequencyToChannel(UINT Frequency, PUINT PChannel, PAirpcapChannelBand PBand);

/*!
\brief Converts a given channel to the corresponding frequency.

\param Channel Channel number to be converted.
\param PFrequency Pointer to a user-supplied variable that will contain the channel frequency in MHz on success.
\return TRUE on success, i.e. the given channel number exists.
*/
BOOL AirpcapConvertChannelToFrequency(UINT Channel, PUINT PFrequency);

/*@}*/

#endif // __AIRPCAP_DRIVER__

#ifdef __cplusplus
}
#endif