public void ProcessRequest(HttpApplication webapp)
{
webapp.HttpResponse.Server = "Microsoft .Net Terrarium";
webapp.HttpResponse.Date = DateTime.Now;
webapp.HttpResponse.ContentType = "text/xml";
webapp.HttpResponse.StatusCode = HttpStatusCode.OK;
webapp.HttpResponse.StatusDescription = "OK";
webapp.HttpResponse.KeepAlive = false;
string body;
if (webapp.HttpRequest.Method == "GET")
{
body = "<version><build>" + peerVersion.Build + "</build>";
body += "<major>" + peerVersion.Major + "</major>\t";
body += "<minor>" + peerVersion.Minor + "</minor>\t</version>";
body += "<channel>" + GameEngine.Current.PeerChannel + "</channel>";
}
else
{
webapp.HttpResponse.StatusCode = HttpStatusCode.MethodNotAllowed;
webapp.HttpResponse.StatusDescription = "Method Not Allowed";
body = "<HTML><BODY>" + "The method " + webapp.HttpRequest.Method;
body += " is not allowed.</BODY></HTML>";
webapp.HttpResponse.ContentType = "text/html";
}
// Encode the body message and place it on the stream.
var bodyBytes = Encoding.ASCII.GetBytes(body);
webapp.HttpResponse.ContentLength = bodyBytes.Length;
webapp.HttpResponse.Close(bodyBytes);
}
/// <summary>
/// Start listening on the given host IP Address, on the given
/// port.
/// </summary>
/// <param name="hostIP">The host's IP address to bind to.</param>
/// <param name="port">The port to bind on.</param>
public void Start(string hostIP, int port)
{
HttpTraceHelper.ExceptionCaught.Level = TraceLevel.Verbose;
_listener = new HttpWebListener();
_listener.Start(port);
// Put this in a loop if we want more listeners in the pool
var stateObject = new HttpApplication();
_listener.BeginGetRequest(_getRequestCB, stateObject);
}
/// <summary>
/// Used to handle a request where the method is supported
/// but insufficient data is available. The primary culprit
/// here is a POST operation with no POST data.
/// </summary>
/// <param name="state">The web application state object for this request.</param>
/// <param name="message">The message to be sent to the client to describe the failure.</param>
public void HandleBadRequest(HttpApplication state, string message)
{
state.HttpResponse.StatusCode = HttpStatusCode.BadRequest;
state.HttpResponse.StatusDescription = "Bad Request";
state.HttpResponse.Server = "Microsoft .Net Terrarium";
state.HttpResponse.Date = DateTime.Now;
state.HttpResponse.ContentType = "text/html";
state.HttpResponse.KeepAlive = false;
var body = message;
var bodyBytes = Encoding.ASCII.GetBytes(body);
state.HttpResponse.ContentLength = bodyBytes.Length;
state.HttpResponse.Close(bodyBytes);
}
/// <summary>
/// Handles a namespace that isn't currently bound by this namespace
/// manager. This could happen because of case sensitivity issues, trailing
/// path characters or any other string morph that causes the namespace
/// to not match one that is currently registered. This should only happen
/// through a failed user connection using a web browser and a mistyped path.
/// </summary>
/// <param name="state">The web application state for the current connection.</param>
public void HandleUnsupportedNamespace(HttpApplication state)
{
state.HttpResponse.StatusCode = HttpStatusCode.OK;
state.HttpResponse.StatusDescription = "OK";
state.HttpResponse.Server = "Microsoft .Net Terrarium";
state.HttpResponse.Date = DateTime.Now;
state.HttpResponse.ContentType = "text/html";
state.HttpResponse.KeepAlive = false;
var body = "<HTML><BODY>Unsupported URI.</BODY></HTML>";
var bodyBytes = Encoding.ASCII.GetBytes(body);
state.HttpResponse.ContentLength = bodyBytes.Length;
state.HttpResponse.Close(bodyBytes);
}
/// <summary>
/// Handles a method that is not supported by the current
/// namespace implementation. This happens whenever a users
/// requests a namespace using a method that isn't valid. This
/// should only happen if Terrarium's of differing versions
/// connect to one another, or someone hits the peer with
/// a web browser and changes the Method to something other than
/// GET or POST.
/// </summary>
/// <param name="state">The web server state object for the connection.</param>
public void HandleUnsupportedMethod(HttpApplication state)
{
state.HttpResponse.StatusCode = HttpStatusCode.MethodNotAllowed;
state.HttpResponse.StatusDescription = "Method Not Allowed";
state.HttpResponse.Server = "Microsoft .Net Terrarium";
state.HttpResponse.Date = DateTime.Now;
state.HttpResponse.ContentType = "text/html";
state.HttpResponse.KeepAlive = false;
var body = "<HTML><BODY>" + "The method " + state.HttpRequest.Method;
body += " is not allowed.</BODY></HTML>";
var bodyBytes = Encoding.ASCII.GetBytes(body);
state.HttpResponse.ContentLength = bodyBytes.Length;
state.HttpResponse.Close(bodyBytes);
}
/// <summary>
/// This method receives requests from other peers and maps the URI
/// namespace or resource name to an actual namespace handler. If one
/// exists then the namespace handler is invoked to process the request.
/// If not some default processing is used.
/// </summary>
/// <param name="asyncResult">The Async object for the request.</param>
public void GetRequestCallback(IAsyncResult asyncResult)
{
try
{
OnBeforeProcessRequest();
var stateObject = asyncResult.AsyncState as HttpApplication;
stateObject.HttpRequest = _listener.EndGetRequest(asyncResult);
if (stateObject.HttpRequest.Method == "GET")
{
var ns = stateObject.HttpRequest.RequestUri.Segments[1];
if (_nsModules.Contains(ns))
{
var nsHandler = (IHttpNamespaceHandler) _nsModules[ns];
nsHandler.ProcessRequest(stateObject);
}
else
{
HandleUnsupportedNamespace(stateObject);
}
}
else if (stateObject.HttpRequest.Method == "POST")
{
if (stateObject.HttpRequest.ContentLength <= 0)
{
var message = "<html><body>Bad Request - POST with no data";
message += "</body></html>";
HandleBadRequest(stateObject, message);
}
else
{
stateObject.RequestStream = stateObject.HttpRequest.GetRequestStream();
try
{
stateObject.RequestStream.BeginRead(stateObject.ReadBuffer, 0, stateObject.ReadBuffer.Length,
_readCB, stateObject);
}
catch (Exception exception)
{
#if DEBUG
if (HttpTraceHelper.ExceptionCaught.TraceVerbose)
{
HttpTraceHelper.WriteLine("Caught exception:" + exception);
}
#endif
}
}
}
else
{
HandleUnsupportedNamespace(stateObject);
}
// Queue up another _listener
var newStateObject = new HttpApplication();
_listener.BeginGetRequest(_getRequestCB, newStateObject);
}
catch (Exception ex)
{
#if DEBUG
if (HttpTraceHelper.ExceptionCaught.TraceVerbose)
{
HttpTraceHelper.WriteLine("Caught exception:" + ex);
}
#endif
var stateObject = asyncResult.AsyncState as HttpApplication;
stateObject.Reset();
_listener.BeginGetRequest(_getRequestCB, stateObject);
}
finally
{
OnAfterProcessRequest();
}
}
/// <summary>
/// Processes the HTTP Request. This handler is capable of
/// processing several different messages and a series of
/// conditional logic is used to determine which message
/// is being invoked.
/// </summary>
/// <param name="webapp">The web application object for the request.</param>
public void ProcessRequest(HttpApplication webapp)
{
// Initiailize any locals. This sets up a basic successful
// response and cahces the requested namespace for the conditional
// logic.
var requestedNamespace = webapp.HttpRequest.RequestUri.AbsolutePath;
webapp.HttpResponse.Server = "Microsoft .Net Terrarium";
webapp.HttpResponse.Date = DateTime.Now;
webapp.HttpResponse.ContentType = "text/xml";
webapp.HttpResponse.StatusCode = HttpStatusCode.OK;
webapp.HttpResponse.StatusDescription = "OK";
webapp.HttpResponse.KeepAlive = false;
var failureReason = "none";
string body;
if (webapp.HttpRequest.Method == "GET")
{
// Code to implement the GET method. The /organisms/stats namespace
// is the important namespace here, and all other namespaces return
// an error.
if (requestedNamespace == "/organisms/stats")
{
// Gets XML statistics information from the
// network engine.
body = _engine.GetNetworkStatistics();
}
else
{
body = "<HTML><BODY>" + "Sorry, GET is not supported for ";
body += webapp.HttpRequest.RequestUri.ToString();
body += "</BODY></HTML>";
webapp.HttpResponse.ContentType = "text/html";
// Return an error stream. The namespace being requested
// doesn't actually exist. This is a BadRequest
webapp.HttpResponse.StatusCode = HttpStatusCode.BadRequest;
}
}
else if (webapp.HttpRequest.Method == "POST")
{
// Code to implement the POST method. Most of the resources
// provided by the OrganismNamespaceHandler have to be
// retrieved using the POST method.
// Prepares a binary formatter to serialize/deserialize
// state information.
var channel = new BinaryFormatter();
// Add a special binder to the BinaryFormatter to ensure that
// the stream hasn't been hacked to try to get us to instantiate an
// object that the organism shouldn't be able to access
channel.Binder = new TeleportStateBinder();
TeleportState theOrganism = null;
if (requestedNamespace == "/organisms/state")
{
_engine.WriteProtocolInfo("/organisms/state: Start receiving TeleportState.");
// Provides an implementation for the /organisms/state
// resource. This resource handles the retrieval of
// a state object that will be placed into the game
// engine (Step 4 of the conversation).
var exceptionOccurred = false;
var ipAddress = webapp.HttpRequest.RemoteEndPoint.Address.ToString();
// If they aren't on the same channel, set the exception bit
// this will cause the teleportation to fail
if (webapp.HttpRequest.Headers["peerChannel"].ToUpper(CultureInfo.InvariantCulture) !=
GameEngine.Current.PeerChannel.ToUpper(CultureInfo.InvariantCulture))
{
exceptionOccurred = true;
failureReason = "Peer channel mismatch";
_engine.WriteProtocolInfo("/organisms/state: Sender is wrong peer channel. Denied.");
}
if (_engine.PeerManager.BadPeer(ipAddress) || !_engine.PeerManager.ShouldReceive(ipAddress))
{
exceptionOccurred = true;
failureReason = "The peer " + ipAddress +
" did not pass the check for badpeer/shouldreceive on the remote peer";
_engine.WriteProtocolInfo(
"/organisms/state: Sender is marked as a bad peer or is sending too often. Denied.");
}
else
{
try
{
theOrganism = (TeleportState) channel.Deserialize(webapp.Buffer);
}
catch (Exception e)
{
ErrorLog.LogHandledException(e);
GameEngine.Current.NetworkEngine.LastTeleportationException = e.ToString();
exceptionOccurred = true;
failureReason = "Exception occured during deserialization of the organism state";
}
}
if (!exceptionOccurred)
{
_engine.WriteProtocolInfo("/organisms/state: TeleportState successfully deserialized.");
// Check to see if the assembly is installed locally
Debug.Assert(GameEngine.Current != null);
Debug.Assert(theOrganism.OrganismState != null);
Debug.Assert(theOrganism.OrganismState.Species != null);
Debug.Assert(((Species) theOrganism.OrganismState.Species).AssemblyInfo != null);
if (
GameEngine.Current.Pac.Exists(
((Species) theOrganism.OrganismState.Species).AssemblyInfo.FullName))
{
_engine.WriteProtocolInfo("/organisms/state: Assembly exists, add organism to game.");
// Add the teleported organism to the game
GameEngine.Current.ReceiveTeleportation(theOrganism, false);
// Let the peer know that we don't need the assembly
body = "<assemblyreceived>true</assemblyreceived>";
}
else
{
_engine.WriteProtocolInfo(
"/organisms/state: Assembly doesn't exist, don't add organism to game.");
// Let the peer know that we'll need the assembly
body = "<assemblyreceived>false</assemblyreceived>";
}
_engine.PeerManager.SetReceive(ipAddress);
}
else
{
_engine.WriteProtocolInfo("/organisms/state: Problem occurred:" + failureReason);
body = "<organismArrived>false</organismArrived><reason>" + failureReason + "</reason>";
GameEngine.Current.NetworkEngine.CountFailedTeleportationReceives();
}
}
else if (requestedNamespace == "/organisms/assemblies")
{
_engine.WriteProtocolInfo("/organisms/assemblies: Start receiving organism assembly");
// Someone is sending us an assembly to save
try
{
var ipAddress = webapp.HttpRequest.RemoteEndPoint.Address.ToString();
if (_engine.PeerManager.BadPeer(ipAddress) || !_engine.PeerManager.ShouldReceive(ipAddress))
{
_engine.WriteProtocolInfo(
"/organisms/assemblies: Sender is marked as a bad peer or is sending too often. Denied.");
body = "<assemblysaved>false</assemblysaved>";
}
else
{
// Write the assembly to a location that is "safe" meaning that it is not
// a location that is known or predictable in any way. This prevents an attack
// where an assembly is sent to this machine with malicious code in it and saved
// in a known location that can be used at a later time.
var tempFile = PrivateAssemblyCache.GetSafeTempFileName();
using (Stream fileStream = File.OpenWrite(tempFile))
{
var bufferBytes = webapp.Buffer.GetBuffer();
fileStream.Write(bufferBytes, 0, bufferBytes.Length);
}
// Now save the assembly in the Private Assembly Cache
var assemblyFullName = webapp.HttpRequest.Headers["Assembly"];
try
{
GameEngine.Current.Pac.SaveOrganismAssembly(tempFile, assemblyFullName);
_engine.WriteProtocolInfo("/organisms/assemblies: Assembly saved in PAC.");
}
catch (Exception e)
{
// The assembly could fail validation
ErrorLog.LogHandledException(e);
GameEngine.Current.NetworkEngine.LastTeleportationException = e.ToString();
GameEngine.Current.NetworkEngine.CountFailedTeleportationReceives();
}
File.Delete(tempFile);
body = "<assemblysaved>true</assemblysaved>";
}
}
catch (Exception ex)
{
ErrorLog.LogHandledException(ex);
body = "<assemblysaved>false</assemblysaved>";
GameEngine.Current.NetworkEngine.LastTeleportationException = ex.ToString();
GameEngine.Current.NetworkEngine.CountFailedTeleportationReceives();
}
}
else if (requestedNamespace == "/organisms/assemblycheck")
{
_engine.WriteProtocolInfo("/organisms/assemblycheck: Checking to see if we have an assembly.");
// Check to see if the assembly is installed locally
var reader = new StreamReader(webapp.Buffer, Encoding.ASCII);
var assemblyName = reader.ReadToEnd();
Debug.Assert(GameEngine.Current != null);
if (GameEngine.Current.Pac.Exists(assemblyName))
{
// Let the peer know that we don't need the assembly
_engine.WriteProtocolInfo("/organisms/assemblycheck: We have it.");
body = "<assemblyexists>true</assemblyexists>";
}
else
{
// Let the peer know that we need the assembly
_engine.WriteProtocolInfo("/organisms/assemblycheck: Don't have it.");
body = "<assemblyexists>false</assemblyexists>";
}
}
else
{
// Handles unsupported namespaces. This could have been
// offloaded to a helper function in the HttpNamespaceManager.
body = "<HTML><BODY>" + "The namespace " + webapp.HttpRequest.RequestUri;
body += " is not supported.</BODY></HTML>";
webapp.HttpResponse.ContentType = "text/html";
}
}
else
{
// Handles rendering of unsupport methods. This could have been
// offloaded to a helper function in the HttpNamespaceManager
// or another class.
webapp.HttpResponse.StatusCode = HttpStatusCode.MethodNotAllowed;
webapp.HttpResponse.StatusDescription = "Method Not Allowed";
body = "<HTML><BODY>" + "The method " + webapp.HttpRequest.Method;
body += " is not allowed.</BODY></HTML>";
webapp.HttpResponse.ContentType = "text/html";
}
// Encode the body response and output the response.
var bodyBytes = Encoding.ASCII.GetBytes(body);
webapp.HttpResponse.ContentLength = bodyBytes.Length;
webapp.HttpResponse.Close(bodyBytes);
}
/// <summary>
/// Start listening on the given host IP Address, on the given
/// port.
/// </summary>
/// <param name="hostIP">The host's IP address to bind to.</param>
/// <param name="port">The port to bind on.</param>
public void Start(string hostIP, int port)
{
HttpTraceHelper.ExceptionCaught.Level = TraceLevel.Verbose;
//TraceHelper.Api.Level = TraceLevel.Verbose;
//TraceHelper.ExceptionThrown.Level = TraceLevel.Verbose;
//TraceHelper.InternalLog.Level = TraceLevel.Verbose;
//TraceHelper.Protocol.Level = TraceLevel.Verbose;
//TraceHelper.Socket.Level = TraceLevel.Verbose;
listener = new HttpWebListener();
listener.Start(port);
// Put this in a loop if we want more listeners in the pool
HttpApplication stateObject = new HttpApplication();
listener.BeginGetRequest(getRequestCB, stateObject);
}
