/// <summary>
/// The entry point for the web server. Gets called after you start NoIIS.
/// </summary>
/// <param name="args">The parameters you give to NoIIS.</param>
public static void Main(string[] args)
{
if (args.Length < 8)
{
Console.WriteLine("Please provide at least four arguments:");
Console.WriteLine(" 1. The assembly containing the handler factories e.g. 'my-app.dll'");
Console.WriteLine(" 2. The temp. folder for uploaded files as cache for the processing");
Console.WriteLine(" 3. The max. request size (bytes)");
Console.WriteLine(" 4. The minimal visits of clients to prevent blocking. Use 0 to disable");
Console.WriteLine(" 5. The entry-time (seconds) wherein the client must gain the minimal visits");
Console.WriteLine(" 6. The maximal visits of clients before blocking. Use 0 to disable");
Console.WriteLine(" 7. The keep-alive time (seconds) before visits get deleted. Client can gain only max. visits within");
Console.WriteLine(" 8. The client's block time (seconds)");
Console.WriteLine(" 9. The client's profile life time (seconds)");
Console.WriteLine(" 10+. The prefix(es) for accepted request e.g. 'http://127.0.0.1:8080/' or 'http://*/test/*', etc.");
Console.WriteLine();
return;
}
NoIISServer.assembly = args[0].Trim();
NoIISServer.tempFolder = args[1].EndsWith(string.Empty + Path.DirectorySeparatorChar) ? args[1] : args[1] + Path.DirectorySeparatorChar;
NoIISServer.maxRequestSizeBytes = int.Parse(args[2]);
NoIISServer.visitsMinimum = int.Parse(args[3]);
NoIISServer.entryTimeSeconds = int.Parse(args[4]);
NoIISServer.visitsMaximum = int.Parse(args[5]);
NoIISServer.keepAliveTimeSeconds = int.Parse(args[6]);
NoIISServer.blockTimeSeconds = int.Parse(args[7]);
NoIISServer.clientLifeTimeSeconds = int.Parse(args[8]);
NoIISServer.hosts = args.Skip(9).ToArray();
NoIISServer.factories = FindHttpHandlerFactories.findFactories(NoIISServer.assembly);
NoIISServer.runner();
}
/// <summary>
/// The main-thread of NoIIS where all client requests are arrives.
/// </summary>
public static void runner()
{
// Set the min. number of threads for the thread-pool:
ThreadPool.SetMinThreads(1000, 600);
// Start maintaining:
Task.Factory.StartNew(() => NoIISServer.maintenanceThread(), TaskCreationOptions.LongRunning);
// The HTTP listener:
var listener = new HttpListener();
// Add all hosts to the listener as end-points:
NoIISServer.hosts.ToList().ForEach((n) => { listener.Prefixes.Add(n); Console.WriteLine(n); });
// Start listening:
listener.Start();
// Loop forever:
while (true)
{
try
{
// Force a maximum number of concurrent clients:
NoIISServer.semaphoreClients.Wait();
// Start the new client thread:
Task.Factory.StartNew(() => NoIISServer.clientThread(listener));
}
catch (Exception e)
{
Console.WriteLine("There was an error for starting a client thread: " + e.Message);
Console.WriteLine(e.StackTrace);
NoIISServer.semaphoreClients.Release();
}
}
}
private static async void clientThread(HttpListener listener)
{
try
{
// Will wait for the next client request:
var context = await listener.GetContextAsync();
// Filter-out any requests which are to huge:
if (context.Request.ContentLength64 > NoIISServer.maxRequestSizeBytes)
{
Console.WriteLine("A request was to huge: {0} bytes.", context.Request.ContentLength64);
context.Response.Abort();
return;
}
// Read the client's address:
var clientAddress = context.Request.RemoteEndPoint.Address.ToString();
// Is this address known?
if (!NoIISServer.clients.ContainsKey(clientAddress))
{
// Unknown:
NoIISServer.createAndStoreClientProfile(clientAddress);
}
//
// In the meanwhile the maintenance thread could take action. Scenario: This client is known
// but was not visiting for the allowed time span. One moment after the previous check, the
// allowed time span expires and the maintenance thread deletes the entry. In such a case,
// an exception will be throwed. Is this the case, we add a new client profile. This is
// fine and a valid case.
//
Client clientProfile;
try {
// Read the client's profile:
clientProfile = NoIISServer.clients[clientAddress];
} catch (KeyNotFoundException) {
// Valide case. Create a new entry:
NoIISServer.createAndStoreClientProfile(clientAddress);
// Read it again. It is not possible that the case occurs again:
clientProfile = NoIISServer.clients[clientAddress];
}
// Is this client blocked?
if (clientProfile.Blocked)
{
Console.WriteLine("A blocked client tried to access: {0}.", clientAddress);
context.Response.Abort();
return;
}
// File this visit. It is intended to do so after the block check.
// Otherwise, an attacker could use this fact to flood the memory
// with visits:
NoIISServer.clientVisits[clientAddress].Enqueue(DateTime.UtcNow);
clientProfile.LastVisitUTC = DateTime.UtcNow;
// Store the changed time. This could happens parallel with several
// threads. Thus, it is not atomic. This behaviour is intended! Only
// the roughly time is necessary.
NoIISServer.clients[clientAddress] = clientProfile;
try
{
// Create the NoIIS request:
var request = new NoIISRequest(context, NoIISServer.tempFolder);
// Create the NoIIS response:
var response = new NoIISResponse(context);
// Create the NoIIS context with request and response:
var webContext = new NoIISContext(request, response);
// Search for a handler inside all factories which matches the request:
var foundHandler = false;
foreach (var factory in NoIISServer.factories)
{
// Does this factory is able to deliver a handler for this request?
var handler = factory.GetHandler(webContext, request.RequestType, request.Path, string.Empty);
// Case: Yes, we have found the first handler:
if (handler != null)
{
// Let the handler process the request:
handler.ProcessRequest(webContext);
foundHandler = true;
// We only use the first matching handler:
break;
}
}
// Case: No handler was found
if (!foundHandler)
{
Console.WriteLine("No handler found for the URL '{0}'.", request.RawUrl);
response.StatusCode = 404;
}
try
{
response.Dispose();
}
catch
{
}
try
{
request.Dispose();
}
catch
{
}
}
catch (Exception e)
{
Console.WriteLine("Exception while processing request: {0}", e.Message);
Console.WriteLine(e.StackTrace);
try
{
context.Response.Abort();
}
catch
{
}
}
}
catch (Exception e)
{
Console.WriteLine("Exception while accepting request: {0}", e.Message);
Console.WriteLine(e.StackTrace);
}
finally
{
NoIISServer.semaphoreClients.Release();
}
}
