public string GetAttributeKeys(MessageSTUN message)
{
string attrKeys = "";
foreach (KeyValuePair <STUNAttribute, object> entry in message.response)
{
string key = Enum.GetName(typeof(STUNAttribute), entry.Key);
int id = (int)entry.Key;
if (attrKeys.Length > 0)
{
attrKeys += "\n";
}
object value = entry.Value;
string valueStr = "";
if (value is string v)
{
valueStr = v;
}
else if (value is byte[] b)
{
valueStr = NetworkSerializer.ByteArrayToHexString(b);
}
else
{
valueStr = value.ToString();
}
attrKeys += key + "(" + id.ToString("X") + ") = " + valueStr;
}
return(attrKeys);
}
public void PadTo32Bits(int len, NetworkSerializer serializer)
{
while (((len++) % 4) != 0)
{
serializer.Write((byte)0);
}
}
public void AddMessageIntegrity(NetworkPacket packet)
{
string saslPassword = new SASLprep().Prepare(password);
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
string valueToHashMD5 = string.Format("{0}:{1}:{2}", username, realm, saslPassword);
byte[] hmacSha1Key = md5.ComputeHash(Encoding.UTF8.GetBytes(valueToHashMD5));
HMACSHA1 hmacSha1 = new HMACSHA1(hmacSha1Key);
byte[] hmacBytes = hmacSha1.ComputeHash(packet.ByteBuffer, 0, packet.byteLength);
packet.Write((ushort)STUNAttribute.MessageIntegrity);
packet.Write((ushort)hmacBytes.Length);
packet.Write(hmacBytes);
Console.WriteLine("Write Attribute: MessageIntegrity(2) MD5 = " + NetworkSerializer.ByteArrayToHexString(hmacSha1Key));
Console.WriteLine("Write Attribute: MessageIntegrity(2) HMAC = " + NetworkSerializer.ByteArrayToHexString(hmacBytes));
}
public void LogAttribute(int index)
{
STUNAttribute attr = attributeTypes[index];
string valueStr = "";
if (response.ContainsKey(attr))
{
object value = response[attr];
if (value is string v)
{
valueStr = v;
}
else if (value is byte[] b)
{
valueStr = NetworkSerializer.ByteArrayToHexString(b);
}
else
{
valueStr = value.ToString();
}
}
Console.WriteLine("Write Attribute: " + Enum.GetName(typeof(STUNAttribute), attr) + " = " + valueStr);
}
public void WriteBytes(STUNAttribute attr, byte[] bytes)
{
serializer.SetBufferLength(0);
serializer.Write((ushort)attr);
serializer.Write((ushort)bytes.Length);
serializer.Write(bytes);
//pad to multiple of 4
PadTo32Bits(bytes.Length, serializer);
Console.WriteLine("Attribute: " + Enum.GetName(typeof(STUNAttribute), attr) + " = " + NetworkSerializer.ByteArrayToHexString((byte[])bytes));
response.Add(attr, bytes);
attributeTypes.Add(attr);
attributeBytes.Add(serializer.ToArray());
}
