public void Read(byte[] buf, ref int offset)
{
Type = (AttributeType)NetBinaryUtil.ReadUShort(buf, ref offset);
var size = NetBinaryUtil.ReadUShort(buf, ref offset);
ReadBody(buf, offset, size);
offset += size + GetPadOffset(size);
}
protected override void ReadBody(byte[] buf, int offset, int size)
{
offset++;
var family = buf[offset++];
var port = (int)(NetBinaryUtil.ReadUShort(buf, ref offset) ^ (ushort)(StunMessage.MagicCookie >> 16));
byte[] address = NetBinaryUtil.ReadBytes(buf, family == 1 ? 4 : 16, ref offset);
for (int i = 0; i < address.Length; i++)
{
address[i] = (byte)(address[i] ^ buf[i + 4]);
}
EndPoint = new IPEndPoint(new IPAddress(address), port);
}
StunAttribute GetAttribute(byte[] buf, ref int offset)
{
int tmp = offset;
var type = (AttributeType)NetBinaryUtil.ReadUShort(buf, ref tmp);
switch (type)
{
case AttributeType.MappedAddress:
case AttributeType.SourceAddress:
case AttributeType.ChangedAddress:
case AttributeType.ReflectedFrom:
case AttributeType.ResponseAddress:
{
var attr = new AddressAttribute(type);
attr.Read(buf, ref offset);
return(attr);
}
case AttributeType.XorMappedAddress:
{
var attr = new XorAddressAttribute(type);
attr.Read(buf, ref offset);
return(attr);
}
case AttributeType.ErrorCode:
{
var attr = new ErrorCodeAttribute(type);
attr.Read(buf, ref offset);
return(attr);
}
case AttributeType.ServerName:
case AttributeType.Username:
case AttributeType.Password:
{
var attr = new ErrorCodeAttribute(type);
attr.Read(buf, ref offset);
return(attr);
}
}
var len = NetBinaryUtil.ReadUShort(buf, ref tmp);
offset += len + StunAttribute.GetPadOffset(len);
return(null);
}