public void SendMessage(byte[] messageData)
{
using (var client = new TcpClient())
{
client.Connect(EndPoint);
using (var stream = client.GetStream())
{
var wrt = new BinaryWriter(stream);
wrt.Write((byte)PeerCommand.BinaryBlob);
GlobalHelpers.ProveIdentity(stream, Client.PublicKey, Client.PrivateKey);
GlobalHelpers.OneTimePad(messageData, Client.SymetricKey);
wrt.Write(messageData.Length);
wrt.Write(messageData);
}
}
}
public void Start()
{
_udpClient.BeginReceive(UdpRecieveLoop, null);
_tcpListener.Start();
_tcpListener.BeginAcceptSocket(TcpAcceptLoop, null);
using (var mem = new MemoryStream())
{
var wrt = new BinaryWriter(mem);
wrt.Write(true); //New client added
wrt.Write(PublicKey.Length);
wrt.Write(PublicKey);
//This is not necessary
//Length is a fixed 16 bytes
//wrt.Write(_broadcastGuid.ToByteArray());
mem.Position = 0;
GlobalHelpers.BroadcastPacket(mem.ToArray(), NetworkPort);
}
}
public void Dispose()
{
try
{
using (var mem = new MemoryStream())
{
var wrt = new BinaryWriter(mem);
wrt.Write(false); //Client is leaving.
wrt.Write(PublicKey.Length);
wrt.Write(PublicKey);
mem.Position = 0;
GlobalHelpers.BroadcastPacket(mem.ToArray(), NetworkPort);
}
}
catch
{
//Ignore this, we're dying anyway.
}
_udpClient?.Close();
_tcpListener?.Stop();
}
private void TcpAcceptLoop(IAsyncResult result)
{
try
{
_tcpListener.BeginAcceptSocket(TcpAcceptLoop, null);
}
catch
{
//Called when disposed
return;
}
using (var socket = _tcpListener.EndAcceptSocket(result))
using (var stream = new NetworkStream(socket))
{
if (!(socket.RemoteEndPoint is IPEndPoint))
{
return;
}
var rdr = new BinaryReader(stream);
var wrt = new BinaryWriter(stream);
switch ((PeerCommand)rdr.ReadByte())
{
case PeerCommand.Identify:
{
byte[] pub;
if (!GlobalHelpers.VerifyIdentity(stream, out pub))
{
return;
}
var symGuid = rdr.ReadBytes(rdr.ReadInt32());
using (var rsa = OpenSslKey.DecodeRsaPrivateKey(PrivateKey))
SymetricKey = new Guid(rsa.Decrypt(symGuid, false));
var peer = new PhonemePeer(this, pub, new IPEndPoint(((IPEndPoint)socket.RemoteEndPoint).Address, NetworkPort));
if (!_knownPeersSet.Contains(peer))
{
_knownPeersSet.Add(peer);
//TODO: Remove this dependency
Application.Current.Dispatcher.Invoke(() => KnownPeers.Add(peer));
PeerJoin?.Invoke(peer);
}
else
{
peer = _knownPeersSet.First(x => x.Equals(peer));
}
peer.DisplayName = rdr.ReadBoolean() ? rdr.ReadString() : null;
if (rdr.ReadBoolean())
{
rdr.ReadBytes(rdr.ReadInt32());
}
wrt.Write(DisplayName != null);
if (DisplayName != null)
{
wrt.Write(DisplayName);
}
wrt.Write(ProfilePicture != null);
if (ProfilePicture != null)
{
wrt.Write(ProfilePicture.Length);
wrt.Write(ProfilePicture);
}
break;
}
case PeerCommand.BinaryBlob:
{
byte[] pub;
if (!GlobalHelpers.VerifyIdentity(stream, out pub))
{
return;
}
var peer = new PhonemePeer(this, pub, new IPEndPoint(((IPEndPoint)socket.RemoteEndPoint).Address, NetworkPort));
if (!_knownPeersSet.Contains(peer))
{
return;
}
peer = _knownPeersSet.First(x => x.Equals(peer));
var blob = rdr.ReadBytes(rdr.ReadInt32());
GlobalHelpers.OneTimePad(blob, SymetricKey);
peer.OnMessageRecieved(blob);
break;
}
default:
throw new ArgumentOutOfRangeException();
}
}
}
