/**
* 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);
}