/// <summary>
/// Create a parser from the input stream.
/// </summary>
/// <param name="buffer">The input stream, must not be null</param>
public STUNMessageParser(ByteBuffer buffer, bool skipValidTest, List <STUNAttr> attrs = null) : this()
{
if (!skipValidTest && !IsValidSTUN(buffer))
{
return;
}
ushort messageType = buffer.GetUShort();
stunClass = (STUNClass)(STUNClassConst.Mask & messageType);
stunMethod = (STUNMethod)(STUNMethodConst.Mask & messageType);
length = buffer.GetUShort();
uint magickCookie = buffer.GetUInt();
transaction = new Transaction(buffer.GetBuffer(Transaction.Length));
// Set buffer already, needed for FillAttributesArray and future working with this object
this.buffer = buffer;
if (null != attrs)
{
FillAttributesArray(attrs);
}
isValid = true;
}
/// <summary>
/// Create a parser from the input stream.
/// </summary>
/// <param name="inputStream">The input stream, must not be null</param>
public STUNMessageParser(ByteBuffer inputStream, List <STUNAttr> attrs) : this()
{
if (null == attrs)
{
return;
}
if (inputStream.Length < STUNMessageBuilder.HEADER_LENGTH)
{
Logger.Error("The message is not long enough");
return;
}
buffer = inputStream;
ushort messageType = buffer.GetUShort();
stunClass = (STUNClass)(STUNClassConst.Mask & messageType);
stunMethod = (STUNMethod)(STUNMethodConst.Mask & messageType);
length = buffer.GetUShort();
if (0 != length % 4)
{
Logger.Warn("STUN header reports a length that is not a multiple of 4");
return;
}
uint magickCookie = buffer.GetUInt();
if (STUNHeader.MAGIC_COOKIE != magickCookie)
{
Logger.Warn("Wrong Magic Cookie");
return;
}
transaction = new Transaction(new ByteBuffer(buffer.data, buffer.absPosition));
buffer.Position += transaction.Length;
if (STUNMessageBuilder.HEADER_LENGTH + length != buffer.Length)
{
return;
}
FillAttributesArray(attrs);
// check CRC if any, and fingerprint. TO DO
isValid = true;
}
public STUNMessageBuilder(ByteBuffer buffer, STUNClass stunClass, STUNMethod stunMethod, Transaction transaction)
{
if (!buffer.HasData() || buffer.Length < MINIMUM_BUFFER_SIZE)
{
this.buffer = new ByteBuffer(new byte[MINIMUM_BUFFER_SIZE]);
Logger.Warn("The buffer is null or not large enough (" + MINIMUM_BUFFER_SIZE + " bytes). A different internal buffer has been allocated");
}
else
{
this.buffer = buffer;
}
this.buffer.absPosition = HEADER_LENGTH;
SetMessageType(stunClass, stunMethod);
this.buffer.Put(4, STUNHeader.MAGIC_COOKIE);
SetTransaction(transaction);
}
/// <summary>
/// Create a parser from the input stream.
/// </summary>
/// <param name="inputStream">The input stream, must not be null</param>
public STUNMessageParser(ByteBuffer inputStream, List <STUNAttr> attrs = null) : this()
{
if (inputStream.Length < STUNMessageBuilder.HEADER_LENGTH)
{
Logger.TraceVerbose("The message is not long enough");
return;
}
buffer = inputStream;
ushort messageType = buffer.GetUShort();
stunClass = (STUNClass)(STUNClassConst.Mask & messageType);
stunMethod = (STUNMethod)(STUNMethodConst.Mask & messageType);
length = buffer.GetUShort();
if (0 != length % 4 || STUNMessageBuilder.HEADER_LENGTH + length != buffer.Length)
{
Logger.TraceVerbose("STUN header reports a wrong length");
return;
}
uint magickCookie = buffer.GetUInt();
if (STUNHeader.MAGIC_COOKIE != magickCookie)
{
Logger.Trace("Wrong Magic Cookie");
return;
}
transaction = new Transaction(new ByteBuffer(buffer.data, buffer.absPosition));
buffer.Position += transaction.Length;
if (null != attrs)
{
FillAttributesArray(attrs);
}
isValid = true;
}
/// <summary>
/// Set the message type.
/// </summary>
/// <param name="group">The STUN class</param>
/// <param name="method">The STUN method</param>
/// <returns>This builder, never null</returns>
private void SetMessageType(STUNClass stunClass, STUNMethod stunMethod)
{
ushort stunMessageType = (ushort)(0x3FFF & ((int)stunClass | (int)stunMethod));
buffer.Put(0, stunMessageType);
}
public STUNMessageBuilder(byte[] buffer, STUNClass stunClass, STUNMethod stunMethod, Transaction transaction) : this(new ByteBuffer(buffer), stunClass, stunMethod, transaction)
{
}
