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 #if SECURITY_DEP
  32
  33 using System.Threading;
  34 namespace System.Net {
  35         class ListenerAsyncResult : IAsyncResult {
  36                 ManualResetEvent handle;
  37                 bool synch;
  38                 bool completed;
  39                 AsyncCallback cb;
  40                 object state;
  41                 Exception exception;
  42                 HttpListenerContext context;
  43                 object locker = new object ();
  44                 ListenerAsyncResult forward;
  45                 internal bool EndCalled;
  46                 internal bool InGet;
  47
  48                 public ListenerAsyncResult (AsyncCallback cb, object state)
  49                 {
  50                         this.cb = cb;
  51                         this.state = state;
  52                 }
  53
  54                 internal void Complete (Exception exc)
  55                 {
  56                         if (forward != null) {
  57                                 forward.Complete (exc);
  58                                 return;
  59                         }
  60                         exception = exc;
  61                         if (InGet && (exc is ObjectDisposedException))
  62                                 exception = new HttpListenerException (500, "Listener closed");
  63                         lock (locker) {
  64                                 completed = true;
  65                                 if (handle != null)
  66                                         handle.Set ();
  67
  68                                 if (cb != null)
  69                                         ThreadPool.UnsafeQueueUserWorkItem (InvokeCB, this);
  70                         }
  71                 }
  72
  73                 static WaitCallback InvokeCB = new WaitCallback (InvokeCallback);
  74                 static void InvokeCallback (object o)
  75                 {
  76                         ListenerAsyncResult ares = (ListenerAsyncResult) o;
  77                         if (ares.forward != null) {
  78                                 InvokeCallback (ares.forward);
  79                                 return;
  80                         }
  81                         try {
  82                                 ares.cb (ares);
  83                         } catch {
  84                         }
  85                 }
  86
  87                 internal void Complete (HttpListenerContext context)
  88                 {
  89                         Complete (context, false);
  90                 }
  91
  92                 internal void Complete (HttpListenerContext context, bool synch)
  93                 {
  94                         if (forward != null) {
  95                                 forward.Complete (context, synch);
  96                                 return;
  97                         }
  98                         this.synch = synch;
  99                         this.context = context;
 100                         lock (locker) {
 101                                 AuthenticationSchemes schemes = context.Listener.SelectAuthenticationScheme (context);
 102                                 if ((schemes == AuthenticationSchemes.Basic || context.Listener.AuthenticationSchemes == AuthenticationSchemes.Negotiate) && context.Request.Headers ["Authorization"] == null) {
 103                                         context.Response.StatusCode = 401;
 104                                         context.Response.Headers ["WWW-Authenticate"] = schemes + " realm=\"" + context.Listener.Realm + "\"";
 105                                         context.Response.OutputStream.Close ();
 106                                         IAsyncResult ares = context.Listener.BeginGetContext (cb, state);
 107                                         this.forward = (ListenerAsyncResult) ares;
 108                                         lock (forward.locker) {
 109                                                 if (handle != null)
 110                                                         forward.handle = handle;
 111                                         }
 112                                         ListenerAsyncResult next = forward;
 113                                         for (int i = 0; next.forward != null; i++) {
 114                                                 if (i > 20)
 115                                                         Complete (new HttpListenerException (400, "Too many authentication errors"));
 116                                                 next = next.forward;
 117                                         }
 118                                 } else {
 119                                         completed = true;
 120                     this.synch = false;
 121
 122                                         if (handle != null)
 123                                                 handle.Set ();
 124
 125                                         if (cb != null)
 126                                                 ThreadPool.UnsafeQueueUserWorkItem (InvokeCB, this);
 127                                 }
 128                         }
 129                 }
 130
 131                 internal HttpListenerContext GetContext ()
 132                 {
 133                         if (forward != null)
 134                                 return forward.GetContext ();
 135                         if (exception != null)
 136                                 throw exception;
 137
 138                         return context;
 139                 }
 140
 141                 public object AsyncState {
 142                         get {
 143                                 if (forward != null)
 144                                         return forward.AsyncState;
 145                                 return state;
 146                         }
 147                 }
 148
 149                 public WaitHandle AsyncWaitHandle {
 150                         get {
 151                                 if (forward != null)
 152                                         return forward.AsyncWaitHandle;
 153
 154                                 lock (locker) {
 155                                         if (handle == null)
 156                                                 handle = new ManualResetEvent (completed);
 157                                 }
 158
 159                                 return handle;
 160                         }
 161                 }
 162
 163                 public bool CompletedSynchronously {
 164                         get {
 165                                 if (forward != null)
 166                                         return forward.CompletedSynchronously;
 167                                 return synch;
 168                         }
 169
 170                 }
 171
 172                 public bool IsCompleted {
 173                         get {
 174                                 if (forward != null)
 175                                         return forward.IsCompleted;
 176
 177                                 lock (locker) {
 178                                         return completed;
 179                                 }
 180                         }
 181                 }
 182         }
 183 }
 184 #endif
 185