mcs/class/System/System.Net/ListenerAsyncResult.cs

   1 //
   2 // System.Net.ListenerAsyncResult
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // Copyright (c) 2005 Ximian, Inc (http://www.ximian.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Threading;
  32 namespace System.Net {
  33         class ListenerAsyncResult : IAsyncResult {
  34                 ManualResetEvent handle;
  35                 bool synch;
  36                 bool completed;
  37                 AsyncCallback cb;
  38                 object state;
  39                 Exception exception;
  40                 HttpListenerContext context;
  41                 object locker = new object ();
  42                 ListenerAsyncResult forward;
  43                 internal bool EndCalled;
  44                 internal bool InGet;
  45
  46                 public ListenerAsyncResult (AsyncCallback cb, object state)
  47                 {
  48                         this.cb = cb;
  49                         this.state = state;
  50                 }
  51
  52                 internal void Complete (Exception exc)
  53                 {
  54                         if (forward != null) {
  55                                 forward.Complete (exc);
  56                                 return;
  57                         }
  58                         exception = exc;
  59                         if (InGet && (exc is ObjectDisposedException))
  60                                 exception = new HttpListenerException (500, "Listener closed");
  61                         lock (locker) {
  62                                 completed = true;
  63                                 if (handle != null)
  64                                         handle.Set ();
  65
  66                                 if (cb != null)
  67                                         ThreadPool.UnsafeQueueUserWorkItem (InvokeCB, this);
  68                         }
  69                 }
  70
  71                 static WaitCallback InvokeCB = new WaitCallback (InvokeCallback);
  72                 static void InvokeCallback (object o)
  73                 {
  74                         ListenerAsyncResult ares = (ListenerAsyncResult) o;
  75                         if (ares.forward != null) {
  76                                 InvokeCallback (ares.forward);
  77                                 return;
  78                         }
  79                         try {
  80                                 ares.cb (ares);
  81                         } catch {
  82                         }
  83                 }
  84
  85                 internal void Complete (HttpListenerContext context)
  86                 {
  87                         Complete (context, false);
  88                 }
  89
  90                 internal void Complete (HttpListenerContext context, bool synch)
  91                 {
  92                         if (forward != null) {
  93                                 forward.Complete (context, synch);
  94                                 return;
  95                         }
  96                         this.synch = synch;
  97                         this.context = context;
  98                         lock (locker) {
  99                                 AuthenticationSchemes schemes = context.Listener.SelectAuthenticationScheme (context);
 100                                 if ((schemes == AuthenticationSchemes.Basic || context.Listener.AuthenticationSchemes == AuthenticationSchemes.Negotiate) && context.Request.Headers ["Authorization"] == null) {
 101                                         context.Response.StatusCode = 401;
 102                                         context.Response.Headers ["WWW-Authenticate"] = schemes + " realm=\"" + context.Listener.Realm + "\"";
 103                                         context.Response.OutputStream.Close ();
 104                                         IAsyncResult ares = context.Listener.BeginGetContext (cb, state);
 105                                         this.forward = (ListenerAsyncResult) ares;
 106                                         lock (forward.locker) {
 107                                                 if (handle != null)
 108                                                         forward.handle = handle;
 109                                         }
 110                                         ListenerAsyncResult next = forward;
 111                                         for (int i = 0; next.forward != null; i++) {
 112                                                 if (i > 20)
 113                                                         Complete (new HttpListenerException (400, "Too many authentication errors"));
 114                                                 next = next.forward;
 115                                         }
 116                                 } else {
 117                                         completed = true;
 118                     this.synch = false;
 119
 120                                         if (handle != null)
 121                                                 handle.Set ();
 122
 123                                         if (cb != null)
 124                                                 ThreadPool.UnsafeQueueUserWorkItem (InvokeCB, this);
 125                                 }
 126                         }
 127                 }
 128
 129                 internal HttpListenerContext GetContext ()
 130                 {
 131                         if (forward != null)
 132                                 return forward.GetContext ();
 133                         if (exception != null)
 134                                 throw exception;
 135
 136                         return context;
 137                 }
 138
 139                 public object AsyncState {
 140                         get {
 141                                 if (forward != null)
 142                                         return forward.AsyncState;
 143                                 return state;
 144                         }
 145                 }
 146
 147                 public WaitHandle AsyncWaitHandle {
 148                         get {
 149                                 if (forward != null)
 150                                         return forward.AsyncWaitHandle;
 151
 152                                 lock (locker) {
 153                                         if (handle == null)
 154                                                 handle = new ManualResetEvent (completed);
 155                                 }
 156
 157                                 return handle;
 158                         }
 159                 }
 160
 161                 public bool CompletedSynchronously {
 162                         get {
 163                                 if (forward != null)
 164                                         return forward.CompletedSynchronously;
 165                                 return synch;
 166                         }
 167
 168                 }
 169
 170                 public bool IsCompleted {
 171                         get {
 172                                 if (forward != null)
 173                                         return forward.IsCompleted;
 174
 175                                 lock (locker) {
 176                                         return completed;
 177                                 }
 178                         }
 179                 }
 180         }
 181 }
 182