private DhtFriend AddNode(IPEndPoint endpoint, byte[] publicKey)
{
lock (_friendsLock)
{
var friend = GetNode(endpoint, publicKey);
if (friend != null)
return friend;
//if the list is full, remove a node that's further away
//TODO: actually remove the node with the biggest distance difference
int index = _friends.Count;
if (_friends.Count == _friends.Capacity)
{
if (ShouldInsert(publicKey, ref index))
return null;
if (_friends.Count == _friends.Capacity)
_friends.RemoveAt(index);
}
byte[] sharedKey = CryptoBox.BeforeNm(publicKey, KeyPair.SecretKey);
friend = new DhtFriend(endpoint, publicKey, sharedKey);
_friends.Insert(index, friend);
Console.WriteLine("Added a new node to our close list: {0}", endpoint);
return friend;
}
}
public void SendPacket(DhtFriend friend, IToxPacket packet)
{
byte[] data = packet.Pack(friend.SharedKey);
Socket.SendTo(data, friend.EndPoint);
}
private void SendPingRequest(DhtFriend friend)
{
var pingRequest = new PingRequest(KeyPair.PublicKey, CryptoRandom.NextUInt64());
friend.AddPing(pingRequest.PingID);
_net.SendPacket(friend, pingRequest);
}
private void SendPingResponse(DhtFriend friend, ulong pingID)
{
var response = new PingResponse(KeyPair.PublicKey, pingID);
_net.SendPacket(friend, response);
}
private void SendGetNodes(DhtFriend friend, byte[] publicKey)
{
var packet = new GetNodesRequest(KeyPair.PublicKey, publicKey);
friend.AddPing(packet.PingID);
_net.SendPacket(friend, packet);
_lastGetNodes = DateTime.Now;
}