mcs/class/System/System.Net/EndPointListener.cs

   1 //
   2 // System.Net.EndPointListener
   3 //
   4 // Author:
   5 //      Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
   6 //
   7 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
   8 // Copyright (c) 2012 Xamarin, Inc. (http://xamarin.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 #if SECURITY_DEP
  31
  32 #if MONO_SECURITY_ALIAS
  33 extern alias MonoSecurity;
  34 using MonoSecurity::Mono.Security.Authenticode;
  35 #else
  36 using Mono.Security.Authenticode;
  37 #endif
  38
  39 using System.IO;
  40 using System.Net.Sockets;
  41 using System.Collections;
  42 using System.Collections.Generic;
  43 using System.Security.Cryptography;
  44 using System.Security.Cryptography.X509Certificates;
  45 using System.Threading;
  46
  47 namespace System.Net {
  48         sealed class EndPointListener
  49         {
  50                 HttpListener listener;
  51                 IPEndPoint endpoint;
  52                 Socket sock;
  53                 Hashtable prefixes;  // Dictionary <ListenerPrefix, HttpListener>
  54                 ArrayList unhandled; // List<ListenerPrefix> unhandled; host = '*'
  55                 ArrayList all;       // List<ListenerPrefix> all;  host = '+'
  56                 X509Certificate cert;
  57                 bool secure;
  58                 Dictionary<HttpConnection, HttpConnection> unregistered;
  59
  60                 public EndPointListener (HttpListener listener, IPAddress addr, int port, bool secure)
  61                 {
  62                         this.listener = listener;
  63
  64                         if (secure) {
  65                                 this.secure = secure;
  66                                 cert = listener.LoadCertificateAndKey (addr, port);
  67                         }
  68
  69                         endpoint = new IPEndPoint (addr, port);
  70                         sock = new Socket (addr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
  71                         sock.Bind (endpoint);
  72                         sock.Listen (500);
  73                         SocketAsyncEventArgs args = new SocketAsyncEventArgs ();
  74                         args.UserToken = this;
  75                         args.Completed += OnAccept;
  76                         sock.AcceptAsync (args);
  77                         prefixes = new Hashtable ();
  78                         unregistered = new Dictionary<HttpConnection, HttpConnection> ();
  79                 }
  80
  81                 internal HttpListener Listener {
  82                         get { return listener; }
  83                 }
  84
  85                 static void OnAccept (object sender, EventArgs e)
  86                 {
  87                         SocketAsyncEventArgs args = (SocketAsyncEventArgs) e;
  88                         EndPointListener epl = (EndPointListener) args.UserToken;
  89                         Socket accepted = null;
  90                         if (args.SocketError == SocketError.Success) {
  91                                 accepted = args.AcceptSocket;
  92                                 args.AcceptSocket = null;
  93                         }
  94
  95                         try {
  96                                 if (epl.sock != null)
  97                                         epl.sock.AcceptAsync (args);
  98                         } catch {
  99                                 if (accepted != null) {
 100                                         try {
 101                                                 accepted.Close ();
 102                                         } catch {}
 103                                         accepted = null;
 104                                 }
 105                         }
 106
 107                         if (accepted == null)
 108                                 return;
 109
 110                         if (epl.secure && epl.cert == null) {
 111                                 accepted.Close ();
 112                                 return;
 113                         }
 114                         HttpConnection conn = new HttpConnection (accepted, epl, epl.secure, epl.cert);
 115                         lock (epl.unregistered) {
 116                                 epl.unregistered [conn] = conn;
 117                         }
 118                         conn.BeginReadRequest ();
 119                 }
 120
 121                 internal void RemoveConnection (HttpConnection conn)
 122                 {
 123                         lock (unregistered) {
 124                                 unregistered.Remove (conn);
 125                         }
 126                 }
 127
 128                 public bool BindContext (HttpListenerContext context)
 129                 {
 130                         HttpListenerRequest req = context.Request;
 131                         ListenerPrefix prefix;
 132                         HttpListener listener = SearchListener (req.Url, out prefix);
 133                         if (listener == null)
 134                                 return false;
 135
 136                         context.Listener = listener;
 137                         context.Connection.Prefix = prefix;
 138                         return true;
 139                 }
 140
 141                 public void UnbindContext (HttpListenerContext context)
 142                 {
 143                         if (context == null || context.Request == null)
 144                                 return;
 145
 146                         context.Listener.UnregisterContext (context);
 147                 }
 148
 149                 HttpListener SearchListener (Uri uri, out ListenerPrefix prefix)
 150                 {
 151                         prefix = null;
 152                         if (uri == null)
 153                                 return null;
 154
 155                         string host = uri.Host;
 156                         int port = uri.Port;
 157                         string path = WebUtility.UrlDecode (uri.AbsolutePath);
 158                         string path_slash = path [path.Length - 1] == '/' ? path : path + "/";
 159
 160                         HttpListener best_match = null;
 161                         int best_length = -1;
 162
 163                         if (host != null && host != "") {
 164                                 Hashtable p_ro = prefixes;
 165                                 foreach (ListenerPrefix p in p_ro.Keys) {
 166                                         string ppath = p.Path;
 167                                         if (ppath.Length < best_length)
 168                                                 continue;
 169
 170                                         if (p.Host != host || p.Port != port)
 171                                                 continue;
 172
 173                                         if (path.StartsWith (ppath) || path_slash.StartsWith (ppath)) {
 174                                                 best_length = ppath.Length;
 175                                                 best_match = (HttpListener) p_ro [p];
 176                                                 prefix = p;
 177                                         }
 178                                 }
 179                                 if (best_length != -1)
 180                                         return best_match;
 181                         }
 182
 183                         ArrayList list = unhandled;
 184                         best_match = MatchFromList (host, path, list, out prefix);
 185                         if (path != path_slash && best_match == null)
 186                                 best_match = MatchFromList (host, path_slash, list, out prefix);
 187                         if (best_match != null)
 188                                 return best_match;
 189
 190                         list = all;
 191                         best_match = MatchFromList (host, path, list, out prefix);
 192                         if (path != path_slash && best_match == null)
 193                                 best_match = MatchFromList (host, path_slash, list, out prefix);
 194                         if (best_match != null)
 195                                 return best_match;
 196
 197                         return null;
 198                 }
 199
 200                 HttpListener MatchFromList (string host, string path, ArrayList list, out ListenerPrefix prefix)
 201                 {
 202                         prefix = null;
 203                         if (list == null)
 204                                 return null;
 205
 206                         HttpListener best_match = null;
 207                         int best_length = -1;
 208
 209                         foreach (ListenerPrefix p in list) {
 210                                 string ppath = p.Path;
 211                                 if (ppath.Length < best_length)
 212                                         continue;
 213
 214                                 if (path.StartsWith (ppath)) {
 215                                         best_length = ppath.Length;
 216                                         best_match = p.Listener;
 217                                         prefix = p;
 218                                 }
 219                         }
 220
 221                         return best_match;
 222                 }
 223
 224                 void AddSpecial (ArrayList coll, ListenerPrefix prefix)
 225                 {
 226                         if (coll == null)
 227                                 return;
 228
 229                         foreach (ListenerPrefix p in coll) {
 230                                 if (p.Path == prefix.Path) //TODO: code
 231                                         throw new HttpListenerException (400, "Prefix already in use.");
 232                         }
 233                         coll.Add (prefix);
 234                 }
 235
 236                 bool RemoveSpecial (ArrayList coll, ListenerPrefix prefix)
 237                 {
 238                         if (coll == null)
 239                                 return false;
 240
 241                         int c = coll.Count;
 242                         for (int i = 0; i < c; i++) {
 243                                 ListenerPrefix p = (ListenerPrefix) coll [i];
 244                                 if (p.Path == prefix.Path) {
 245                                         coll.RemoveAt (i);
 246                                         return true;
 247                                 }
 248                         }
 249                         return false;
 250                 }
 251
 252                 void CheckIfRemove ()
 253                 {
 254                         if (prefixes.Count > 0)
 255                                 return;
 256
 257                         ArrayList list = unhandled;
 258                         if (list != null && list.Count > 0)
 259                                 return;
 260
 261                         list = all;
 262                         if (list != null && list.Count > 0)
 263                                 return;
 264
 265                         EndPointManager.RemoveEndPoint (this, endpoint);
 266                 }
 267
 268                 public void Close ()
 269                 {
 270                         sock.Close ();
 271                         lock (unregistered) {
 272                                 //
 273                                 // Clone the list because RemoveConnection can be called from Close
 274                                 //
 275                                 var connections = new List<HttpConnection> (unregistered.Keys);
 276
 277                                 foreach (HttpConnection c in connections)
 278                                         c.Close (true);
 279                                 unregistered.Clear ();
 280                         }
 281                 }
 282
 283                 public void AddPrefix (ListenerPrefix prefix, HttpListener listener)
 284                 {
 285                         ArrayList current;
 286                         ArrayList future;
 287                         if (prefix.Host == "*") {
 288                                 do {
 289                                         current = unhandled;
 290                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 291                                         prefix.Listener = listener;
 292                                         AddSpecial (future, prefix);
 293                                 } while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
 294                                 return;
 295                         }
 296
 297                         if (prefix.Host == "+") {
 298                                 do {
 299                                         current = all;
 300                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 301                                         prefix.Listener = listener;
 302                                         AddSpecial (future, prefix);
 303                                 } while (Interlocked.CompareExchange (ref all, future, current) != current);
 304                                 return;
 305                         }
 306
 307                         Hashtable prefs, p2;
 308                         do {
 309                                 prefs = prefixes;
 310                                 if (prefs.ContainsKey (prefix)) {
 311                                         HttpListener other = (HttpListener) prefs [prefix];
 312                                         if (other != listener) // TODO: code.
 313                                                 throw new HttpListenerException (400, "There's another listener for " + prefix);
 314                                         return;
 315                                 }
 316                                 p2 = (Hashtable) prefs.Clone ();
 317                                 p2 [prefix] = listener;
 318                         } while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
 319                 }
 320
 321                 public void RemovePrefix (ListenerPrefix prefix, HttpListener listener)
 322                 {
 323                         ArrayList current;
 324                         ArrayList future;
 325                         if (prefix.Host == "*") {
 326                                 do {
 327                                         current = unhandled;
 328                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 329                                         if (!RemoveSpecial (future, prefix))
 330                                                 break; // Prefix not found
 331                                 } while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
 332                                 CheckIfRemove ();
 333                                 return;
 334                         }
 335
 336                         if (prefix.Host == "+") {
 337                                 do {
 338                                         current = all;
 339                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 340                                         if (!RemoveSpecial (future, prefix))
 341                                                 break; // Prefix not found
 342                                 } while (Interlocked.CompareExchange (ref all, future, current) != current);
 343                                 CheckIfRemove ();
 344                                 return;
 345                         }
 346
 347                         Hashtable prefs, p2;
 348                         do {
 349                                 prefs = prefixes;
 350                                 if (!prefs.ContainsKey (prefix))
 351                                         break;
 352
 353                                 p2 = (Hashtable) prefs.Clone ();
 354                                 p2.Remove (prefix);
 355                         } while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
 356                         CheckIfRemove ();
 357                 }
 358         }
 359 }
 360 #endif
 361