/// <summary>
/// Sets the SSID with a string
/// </summary>
/// <param name="ssidTag">The SSID tag on which to set the value</param>
/// <param name="value">The value to set the SSID</param>
public static void SetSSID(this SSIDTag ssidTag, string value)
{
ssidTag.SSIDBytes = Encoding.UTF8.GetBytes(value);
}
/// <summary>
/// Attempts to parse raw data into a structured packet
/// </summary>
/// <param name="buffer">Raw data to parse</param>
/// <param name="packet">Parsed packet</param>
/// <param name="count">The length of the packet in bytes</param>
/// <param name="index">The index into the buffer at which the packet begins</param>
/// <returns>True if parsing was successful, false if it is not.</returns>
internal static bool TryParse(byte[] buffer, int index, int count, out Beacon802_11 packet)
{
try
{
if (count < MinimumParseableBytes)
{
packet = null;
return(false);
}
using (var ms = new MemoryStream(buffer, index, count, false))
{
using (var br = new BinaryReader(ms))
{
packet = new Beacon802_11();
packet.Timestamp = br.ReadUInt64();
packet.BeaconInterval = br.ReadBytes(2);
packet.Capabilities = br.ReadUInt16();
while (br.BaseStream.Position <= count - 2)
{
IManagementTag newTag = null;
var tagType = br.ReadByte();
var tagLength = br.ReadByte();
var safeLength = Math.Min(tagLength, count - (int)br.BaseStream.Position);
switch (tagType)
{
case (byte)ManagementTagTypes.SSID:
{
SSIDTag tag;
if (SSIDTag.TryParse(
buffer,
index + (int)br.BaseStream.Position - 2,
2 + safeLength,
out tag))
{
newTag = tag;
}
}
break;
case (byte)ManagementTagTypes.VendorSpecific:
{
/* We'll ask each vendor to parse. Not the most efficient solution.
* MSTag msTag;
* if (MSTag.TryParse(
* buffer,
* index + (int)br.BaseStream.Position - 2,
* 2 + safeLength,
* out msTag))
* {
* newTag = msTag;
* }
* else
* {*/
VendorTag tag;
if (VendorTag.TryParse(
buffer,
index + (int)br.BaseStream.Position - 2,
2 + safeLength,
out tag))
{
newTag = tag;
}
/*}*/
}
break;
}
if (newTag == null)
{
UnsupportedTag tag;
UnsupportedTag.TryParse(
buffer,
index + (int)br.BaseStream.Position - 2,
2 + safeLength,
out tag);
newTag = tag;
}
br.BaseStream.Seek(safeLength, SeekOrigin.Current);
packet.Tags.Add(newTag);
}
return(true);
}
}
}
catch (Exception)
{
packet = null;
return(false);
}
}
/// <summary>
/// Gets the SSID as a string
/// </summary>
/// <param name="ssidTag">The SSID tag</param>
/// <returns>The SSID as a string</returns>
public static string SSIDString(this SSIDTag ssidTag)
{
return(Encoding.UTF8.GetString(ssidTag.SSIDBytes, 0, ssidTag.SSIDBytes.Length));
}
