/// <summary>Creates a new channel in the network stack with a given encryption IV.</summary>
void CreateChannel(int Reference, byte[] IV)
{
EncryptWrapper ew = new EncryptWrapper(Endpoint, (byte[])Key.Clone(), IV);
lock (DataChannels)
DataChannels.Add(Reference, ew);
}
/// <summary>Handler for messages on the control channel.</summary>
byte[] ControlReply(byte[] IMsg, int IOf, int IOc, out int OOf, out int OOc)
{
int MsgT = GetInt(IMsg, IOf);
MessageType Type = (MessageType)MsgT;
int Reference;
switch (Type)
{
case MessageType.Handshake:
OOf = IOf; OOc = IOc;
return(IMsg);
case MessageType.OpenReference:
byte[] IV = EncryptWrapper.RequestIV();
Reference = GetInt(IMsg, IOf + 4);
CreateChannel(Reference, IV);
OOf = 0; OOc = IV.Length;
return(IV);
case MessageType.CloseReference:
Reference = GetInt(IMsg, IOf + 4);
ControlChannel.UnregisterCallback(Reference);
lock (DataChannels)
DataChannels.Remove(Reference);
OOf = IOf; OOc = IOc;
return(IMsg);
}
OOf = 0; OOc = 0;
return(new byte[0]);
}
/// <summary>
/// Listens on the give <paramref name="Port"/> with the given keys.
/// </summary>
/// <param name="Port">Local listening port.</param>
/// <param name="NEKey">Non-encryption key. Used for fast filtering incoming connections.</param>
/// <param name="EKey">Encryption key.</param>
public void CreateListener(int Port, string NEKey, byte[] EKey)
{
Key = EKey;
Endpoint = new NetLibEndpoint(Log);
Endpoint.RegisterCallback(0, NSReply0);
ControlChannel = new EncryptWrapper(Endpoint, EKey, IV0);
ControlChannel.RegisterCallback(1, ControlReply);
Endpoint.Listen(Port, NEKey);
}
/// <summary>
/// Connects to the remote <paramref name="Host"/> on the given <paramref name="Port"/>, using the given keys.
/// </summary>
/// <param name="Host">Remote host.</param>
/// <param name="Port">Remote port.</param>
/// <param name="NEKey">Non-encryption key. Used for fast filtering on the remote host.</param>
/// <param name="EKey">Encryption key.</param>
public void EstablishConnection(string Host, int Port, string NEKey, byte[] EKey)
{
Key = (byte[])EKey.Clone();
Endpoint = new NetLibEndpoint(Log);
Endpoint.Connect(Host, Port, NEKey);
string Message = SendReceiveText(Endpoint, 0, "WNS-C");
if (Message != "WNS-S")
{
throw new System.Net.ProtocolViolationException("Remote host does not follow Webrella Network Stack");
}
ControlChannel = new EncryptWrapper(Endpoint, EKey, IV0);
ControlChannel.RegisterCallback(1, ControlReply);
SendHandshake();
}