/// <summary>
/// Converts a pointer to a BSS list (header + entries) to an array of BSS entries.
/// </summary>
/// <returns>An array of BSS entries.</returns>
private NdisWlanBssidEx[] ConvertBssidListPtr(IntPtr bssidListPtr)
{
//
// Marshal the bssid list structure to get the number of items plus
// the first bssid entry.
//
Ndis802Dot11BssidListEx bssidList =
(Ndis802Dot11BssidListEx)Marshal.PtrToStructure(bssidListPtr,
typeof(Ndis802Dot11BssidListEx));
//
// Iterate through memory and marshal each bssid entry. We have
// to marshal the individual structures one at a time, since they
// vary in size.
//
NdisWlanBssidEx[] bssidEntries = null;
if (bssidList.NumberOfItems > 0)
{
bssidEntries = new NdisWlanBssidEx[bssidList.NumberOfItems];
long bssidAddress = bssidListPtr.ToInt64() + Marshal.SizeOf(bssidList.NumberOfItems)
+ bssidList.Bssid[0].Length;
bssidEntries[0] = bssidList.Bssid[0];
//
// Starting from the second array entry, iterate and marshal each of the
// existing bssid entries.
//
for (int i = 1; i < bssidList.NumberOfItems; ++i)
{
//
// Marshal the currently referenced bssid item and add it to the
// array.
//
NdisWlanBssidEx bssidEntry = (NdisWlanBssidEx)Marshal.PtrToStructure(
new IntPtr(bssidAddress), typeof(NdisWlanBssidEx));
bssidEntries[i] = bssidEntry;
//
// Move the pointer to the next bssid entry.
//
bssidAddress += bssidEntry.Length;
}
// Patch from cborn:
// We can receive either NDIS_WLAN_BSSID (104 bytes) or NDIS_WLAN_BSSID_EX (>=120 bytes) here
// More of its devices send the obsolete 104 byte one than the new one
// We should handle it properly, but for now I'll just set the IELength field to 0,
// and clear out the additional 8 supported rate fields
// DAV 20AUG08
for (int i = 0; i < bssidList.NumberOfItems; ++i)
{
if (bssidEntries[i].Length < 120)
{
bssidEntries[i].IELength = 0;
for (int j = 8; j < 16; ++j)
{
bssidEntries[i].SupportedRates[j] = 0;
}
}
}
}
return(bssidEntries);
}
/// <summary>
/// Converts a pointer to a BSS list (header + entries) to an array of BSS entries.
/// </summary>
/// <returns>An array of BSS entries.</returns>
private NdisWlanBssidEx[] ConvertBssidListPtr(IntPtr bssidListPtr)
{
//
// Marshal the bssid list structure to get the number of items plus
// the first bssid entry.
//
Ndis802Dot11BssidListEx bssidList =
(Ndis802Dot11BssidListEx)Marshal.PtrToStructure(bssidListPtr,
typeof(Ndis802Dot11BssidListEx));
//
// Iterate through memory and marshal each bssid entry. We have
// to marshal the individual structures one at a time, since they
// vary in size.
//
NdisWlanBssidEx[] bssidEntries = null;
if (bssidList.NumberOfItems > 0) {
bssidEntries = new NdisWlanBssidEx[bssidList.NumberOfItems];
long bssidAddress = bssidListPtr.ToInt64() + Marshal.SizeOf(bssidList.NumberOfItems)
+ bssidList.Bssid[0].Length;
bssidEntries[0] = bssidList.Bssid[0];
//
// Starting from the second array entry, iterate and marshal each of the
// existing bssid entries.
//
for (int i = 1; i < bssidList.NumberOfItems; ++i) {
//
// Marshal the currently referenced bssid item and add it to the
// array.
//
NdisWlanBssidEx bssidEntry = (NdisWlanBssidEx)Marshal.PtrToStructure(
new IntPtr(bssidAddress), typeof(NdisWlanBssidEx));
bssidEntries[i] = bssidEntry;
//
// Move the pointer to the next bssid entry.
//
bssidAddress += bssidEntry.Length;
}
// Patch from cborn:
// We can receive either NDIS_WLAN_BSSID (104 bytes) or NDIS_WLAN_BSSID_EX (>=120 bytes) here
// More of its devices send the obsolete 104 byte one than the new one
// We should handle it properly, but for now I'll just set the IELength field to 0,
// and clear out the additional 8 supported rate fields
// DAV 20AUG08
for (int i = 0; i < bssidList.NumberOfItems; ++i) {
if (bssidEntries[i].Length < 120) {
bssidEntries[i].IELength = 0;
for (int j = 8; j < 16; ++j)
bssidEntries[i].SupportedRates[j] = 0;
}
}
}
return bssidEntries;
}
/// <summary>
/// Returns the string representation of the privacy mode
/// for the specified bssid.
/// </summary>
/// <param name="bssidItem">bssid from which to read the privacy mode</param>
/// <returns>a string representing the privacy mode</returns>
public string GetSecurityString(NdisWlanBssidEx bssidItem)
{
string privacyMode = "Open";
if (bssidItem.Privacy != 0)
{
privacyMode = "WEP";
//
// To get the privacy information, the variable length
// information elements must be inspected. Thereore, we
// skip past the fixed information elements.
//
int index = Marshal.SizeOf(typeof(Ndis802Dot11FixedIes));
//
// Iterate through the variable information elements.
//
int length = (int)bssidItem.IELength - 2;
while ((index >= 0) && (index <= length))
{
//
// Get the element id and the length of the
// element.
//
// TODO: Should index be incremented here, since
// it is incremented again down below?
byte elementId = bssidItem.IEs[index++];
byte elementLength = bssidItem.IEs[index++];
//
// Determine the required privacy mode.
//
if (WlanEidRsn == elementId)
{
// Parse the RSN cipher suite value
if (elementLength >= 6 &&
bssidItem.IEs[index + 0] == 0x01 && // version msb
bssidItem.IEs[index + 1] == 0x00 && // version lsb
bssidItem.IEs[index + 2] == 0x00 && // cipher suite id b1
bssidItem.IEs[index + 3] == 0x0F && // cipher suite id b2
bssidItem.IEs[index + 4] == 0xAC) // cipher suite id b3
// Dispatch on the cipher suite selector
{
switch (bssidItem.IEs[index + 5])
{
case 1: // WEP-40
privacyMode = "WEP-40";
break;
case 5: // WEP-104
privacyMode = "WEP-104";
break;
case 2: // TKIP -> Personal
privacyMode = "WPA2-Personal";
break;
case 4: // CCMP -> Enterprise
privacyMode = "WPA2-Enterprise";
break;
default:
privacyMode = "Unknown";
break;
}
}
//Debug.WriteLine("WLAN_EID_RSN : length = " + elementLength);
break;
}
if (WlanEidVendorSpecific == elementId)
{
//Debug.WriteLine("WLAN_EID_VENDOR_SPECIFIC");
// BEGIN FM
// Parse the Microsoft OUI
if (elementLength >= 3 &&
bssidItem.IEs[index + 0] == 0x00 &&
bssidItem.IEs[index + 1] == 0x50 &&
bssidItem.IEs[index + 2] == 0xF2 &&
bssidItem.IEs[index + 3] == 0x01) // 1 == WPA, 2 == WMM ???
{
privacyMode = "WPA-Personal";
}
// END FM
}
//
// Move to the next information element.
//
// TODO: We incremented index twice before this call. Is it valid
// to increment by element length again?
index += elementLength;
}
}
return(privacyMode);
}
/// <summary>
/// Returns the string representation of the privacy mode
/// for the specified bssid.
/// </summary>
/// <param name="bssidItem">bssid from which to read the privacy mode</param>
/// <returns>a string representing the privacy mode</returns>
public string GetSecurityString(NdisWlanBssidEx bssidItem)
{
string privacyMode = "Open";
if (bssidItem.Privacy != 0) {
privacyMode = "WEP";
//
// To get the privacy information, the variable length
// information elements must be inspected. Thereore, we
// skip past the fixed information elements.
//
int index = Marshal.SizeOf(typeof(Ndis802Dot11FixedIes));
//
// Iterate through the variable information elements.
//
int length = (int)bssidItem.IELength - 2;
while ((index >= 0) && (index <= length)) {
//
// Get the element id and the length of the
// element.
//
// TODO: Should index be incremented here, since
// it is incremented again down below?
byte elementId = bssidItem.IEs[index++];
byte elementLength = bssidItem.IEs[index++];
//
// Determine the required privacy mode.
//
if (WlanEidRsn == elementId) {
// Parse the RSN cipher suite value
if (elementLength >= 6 &&
bssidItem.IEs[index + 0] == 0x01 && // version msb
bssidItem.IEs[index + 1] == 0x00 && // version lsb
bssidItem.IEs[index + 2] == 0x00 && // cipher suite id b1
bssidItem.IEs[index + 3] == 0x0F && // cipher suite id b2
bssidItem.IEs[index + 4] == 0xAC) { // cipher suite id b3
// Dispatch on the cipher suite selector
switch (bssidItem.IEs[index + 5]) {
case 1: // WEP-40
privacyMode = "WEP-40";
break;
case 5: // WEP-104
privacyMode = "WEP-104";
break;
case 2: // TKIP -> Personal
privacyMode = "WPA2-Personal";
break;
case 4: // CCMP -> Enterprise
privacyMode = "WPA2-Enterprise";
break;
default:
privacyMode = "Unknown";
break;
}
}
//Debug.WriteLine("WLAN_EID_RSN : length = " + elementLength);
break;
}
if (WlanEidVendorSpecific == elementId) {
//Debug.WriteLine("WLAN_EID_VENDOR_SPECIFIC");
// BEGIN FM
// Parse the Microsoft OUI
if (elementLength >= 3 &&
bssidItem.IEs[index + 0] == 0x00 &&
bssidItem.IEs[index + 1] == 0x50 &&
bssidItem.IEs[index + 2] == 0xF2 &&
bssidItem.IEs[index + 3] == 0x01) { // 1 == WPA, 2 == WMM ???
privacyMode = "WPA-Personal";
}
// END FM
}
//
// Move to the next information element.
//
// TODO: We incremented index twice before this call. Is it valid
// to increment by element length again?
index += elementLength;
}
}
return (privacyMode);
}
