void HandleRequest(object state)
{
// try to logon the user and create the response
var request = (Request)state;
int timeout;
try { timeout = LogonAndCreateSession(request.UserName, request.Password, request.Address); }
catch (OleDbException e)
{
ServiceApplication.LogEvent(EventLogEntryType.Error, e.Message);
return;
}
var response = new RadiusPacket(timeout < 0 ? PacketCode.AccessReject : PacketCode.AccessAccept);
response.Identifier = request.Identifier;
if (timeout > 0)
{
response.Attribute(RadiusAttribute.SessionTimeout).Add(timeout);
}
response.Attribute(RadiusAttribute.ProxyState).AddRange(request.ProxyStates);
response.SignResponse(request.Authenticator, sharedSecred);
try { socket.SendTo(response.GetBuffer(), 0, response.Length, SocketFlags.None, request.Client); }
catch (ObjectDisposedException) { }
catch (SocketException e) { ServiceApplication.LogEvent(EventLogEntryType.Error, e.Message); }
}
void Listener()
{
// create the buffer and start listening
var buffer = new byte[0x10000];
while (true)
{
// receive the next message
var endpoint = (EndPoint) new IPEndPoint(IPAddress.Any, 0);
var length = socket.ReceiveFrom(buffer, ref endpoint);
// if nothing is received, continue listening
if (length == 0)
{
continue;
}
// parse the packet and retrieve all necessary attributes
var request = new Request();
request.Client = (IPEndPoint)endpoint;
try
{
var packet = new RadiusPacket(buffer, length);
if (packet.Code != PacketCode.AccessRequest)
{
continue;
}
request.Identifier = packet.Identifier;
request.Authenticator = packet.Authenticator;
if (packet.Attribute(RadiusAttribute.CHAPPassword).Count > 0)
{
throw new FormatException("CHAP-Password is not supported");
}
var userNames = packet.Attribute(RadiusAttribute.UserName);
if (userNames.Count != 1)
{
throw new FormatException("User-Name is not present");
}
request.UserName = userNames[0];
if (packet.Attribute(RadiusAttribute.UserPassword).Count != 1)
{
throw new FormatException("User-Password is not present");
}
request.Password = packet.GetUserPassword(sharedSecred);
var callerIds = packet.Attribute(RadiusAttribute.CallingStationId);
request.Address = callerIds.Count > 0 ? callerIds[0] : null;
request.ProxyStates = packet.Attribute(RadiusAttribute.ProxyState).ToArray();
}
#if DEBUG
catch (FormatException e)
{
ServiceApplication.LogEvent(EventLogEntryType.Information, e.Message);
continue;
}
#else
catch (FormatException) { continue; }
#endif
// enqueue the request
ThreadPool.QueueUserWorkItem(HandleRequest, request);
}
}
