Exemplo n.º 1
0
        /**
         * Sends an answer to a proxied packet back to the original host.
         * Retrieves the RadiusProxyConnection object from the cache employing
         * the Proxy-State attribute.
         * @param packet packet to be sent back
         * @param remote the server the packet arrived from
         * @throws IOException
         */

        protected void proxyPacketReceived(RadiusPacket packet, IPEndPoint remote)
        {
            // retrieve my Proxy-State attribute (the last)
            IList <RadiusAttribute> proxyStates = packet.GetAttributes(33);

            if (proxyStates == null || proxyStates.Count == 0)
            {
                throw new RadiusException("Proxy packet without Proxy-State attribute");
            }
            RadiusAttribute proxyState = proxyStates[proxyStates.Count - 1];

            // retrieve Proxy connection from cache
            string state           = BitConverter.ToString(proxyState.Data);
            var    proxyConnection = (RadiusProxyConnection)proxyConnections[state];

            proxyConnections.Remove(state);
            if (proxyConnection == null)
            {
                logger.Warn("received packet on Proxy port without saved Proxy connection - duplicate?");
                return;
            }

            // retrieve client
            RadiusEndpoint client = proxyConnection.RadiusClient;

            if (logger.IsInfoEnabled)
            {
                logger.Info("received Proxy packet: " + packet);
                logger.Info("forward packet to " + client.EndpointAddress + " with secret " +
                            client.SharedSecret);
            }

            // remove only own Proxy-State (last attribute)
            packet.RemoveLastAttribute(33);

            // re-encode answer packet with authenticator of the original packet
            var answer = new RadiusPacket(packet.Type, packet.Identifier, packet.Attributes);

            byte[] datagram = MakeDatagramPacket(answer, client.SharedSecret, proxyConnection.Packet);

            // send back using correct socket
            UdpClient socket = proxyConnection.Port == AuthPort?GetAuthSocket() : GetAcctSocket();

            socket.Send(datagram, datagram.Length, remote);
        }