public virtual ulong Add(IPAddress sourceIP)
{
if (sourceIP == null)
{
throw new ArgumentNullException("sourceIP");
}
ulong sessionKey;
IPKey key;
lock (records)
{
do
{
random.GetBytes(rbuf);
sessionKey = 0;
for (int i = 0; i < rbuf.Length; i++)
{
sessionKey <<= 8;
sessionKey += rbuf[i];
}
key = new IPKey(sourceIP, sessionKey);
} while (records.Contains(key));
records.Add(key);
}
return(sessionKey);
}
public virtual void Run()
{
if (running)
{
throw new InvalidOperationException("Server is running on another thread");
}
var ack = new byte[0];
while (running)
{
remoteEndPoint.Address = IPAddress.IPv6Any;
remoteEndPoint.Port = 0;
EndPoint endpoint = remoteEndPoint;
int len = socket.ReceiveFrom(buffer, ref endpoint);
socket.SendTo(ack, endpoint);
if (len != sizeof(ulong))
{
continue;
}
var ipep = (IPEndPoint)endpoint;
ulong sessionKey = 0;
for (int i = 0; i < sizeof(ulong); i++)
{
sessionKey <<= 8;
sessionKey += buffer[i];
}
var key = new IPKey(ipep.Address, sessionKey);
bool removed;
lock (records)
removed = records.Remove(key);
if (removed)
{
lock (sourcePorts)
sourcePorts.Add(key, (ushort)ipep.Port);
}
}
}
