public void ReceivePacket(G2ReceivedPacket packet)
{
// Network packet
if (packet.Root.Name == RootPacket.Network)
{
NetworkPacket netPacket = NetworkPacket.Decode(packet.Root);
G2ReceivedPacket embedded = new G2ReceivedPacket();
embedded.Tcp = packet.Tcp;
embedded.Source = packet.Source;
embedded.Source.UserID = netPacket.SourceID;
embedded.Source.ClientID = netPacket.ClientID;
embedded.Root = new G2Header(netPacket.InternalData);
// from - received from proxy server
if (netPacket.FromAddress != null)
{
if (packet.ReceivedUdp)
{
throw new Exception("From tag set on packet received udp");
}
if (packet.Tcp.Proxy != ProxyType.Server)
{
throw new Exception("From tag (" + netPacket.FromAddress.ToString() + ") set on packet not received from server (" + packet.Tcp.ToString() + ")");
}
embedded.Source = new DhtContact(netPacket.FromAddress);
}
// to - received from proxied node, and not for us
if (netPacket.ToAddress != null &&
!(netPacket.ToAddress.UserID == Local.UserID && netPacket.ToAddress.ClientID == Local.ClientID))
{
if (packet.ReceivedUdp)
{
throw new Exception("To tag set on packet received udp");
}
if (packet.Tcp.Proxy == ProxyType.Server || packet.Tcp.Proxy == ProxyType.Unset)
{
throw new Exception("To tag set on packet received from server");
}
DhtAddress address = netPacket.ToAddress;
netPacket.ToAddress = null;
TcpConnect direct = TcpControl.GetProxy(address);
if (direct != null)
{
direct.SendPacket(netPacket);
}
else
{
UdpControl.SendTo(address, netPacket);
}
return;
}
// process
if (G2Protocol.ReadPacket(embedded.Root))
{
ReceiveNetworkPacket(embedded);
}
}
// Tunnel Packet
else if (packet.Root.Name == RootPacket.Tunnel)
{
// can only tunnel over lookup network
if (!IsLookup)
{
return;
}
PacketLogEntry logEntry = new PacketLogEntry(Core.TimeNow, TransportProtocol.Tunnel, DirectionType.In, packet.Source, packet.Root.Data);
LogPacket(logEntry);
TunnelPacket tunnel = TunnelPacket.Decode(packet.Root);
// handle locally
if (tunnel.Target.Equals(Local))
{
Core.Context.Cores.LockReading(delegate()
{
foreach (OpCore core in Core.Context.Cores)
{
if (core.TunnelID == tunnel.Target.TunnelID)
{
core.Network.ReceiveTunnelPacket(packet, tunnel);
}
}
});
}
else if (tunnel.TargetServer != null)
{
TcpConnect direct = TcpControl.GetProxy(tunnel.Target);
// if directly connected add from and forwared
if (direct != null)
{
direct.SendPacket(tunnel);
}
// only forward udp if received over tcp from a proxied host
else if (tunnel.TargetServer != null && packet.ReceivedTcp && packet.Tcp.Proxy != ProxyType.Server)
{
UdpControl.SendTo(tunnel.TargetServer, tunnel);
}
}
}
// Communication Packet
else if (packet.Root.Name == RootPacket.Comm)
{
RudpPacket commPacket = RudpPacket.Decode(packet);
// received direct
packet.Source.UserID = commPacket.SenderID;
packet.Source.ClientID = commPacket.SenderClient;
// remote node is proxied
if (commPacket.RemoteProxy != null)
{
packet.Source = new DhtContact(commPacket.RemoteProxy);
}
// For local host
if (commPacket.TargetID == Local.UserID && commPacket.TargetClient == Local.ClientID)
{
ReceiveCommPacket(packet, commPacket);
return;
}
// Also Forward to appropriate node
TcpConnect socket = TcpControl.GetProxy(commPacket.TargetID, commPacket.TargetClient);
if (socket != null)
{
// forward to proxied node - strip TO flag, add from address
commPacket.ToAddress = null;
commPacket.RemoteProxy = packet.Source; // if remote proxy is null, then we are setting this to the packet's original source
socket.SendPacket(commPacket);
return;
}
// received from a proxied node, forward udp
if (packet.ReceivedTcp && commPacket.ToAddress != null)
{
DhtAddress target = commPacket.ToAddress;
commPacket.ToAddress = null; // strip TO flag
commPacket.RemoteProxy = new DhtAddress(Core.LocalIP, GetLocalSource());
UdpControl.SendTo(target, commPacket);
}
}
}