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                         Accept (sock, 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 Accept (Socket socket, SocketAsyncEventArgs e) {
  86                         e.AcceptSocket = null;
  87                         var asyn = socket.AcceptAsync(e);
  88                         if (!asyn) {
  89                                 ProcessAccept(e);
  90                         }
  91                 }
  92
  93
  94                 static void ProcessAccept (SocketAsyncEventArgs args)
  95                 {
  96                         Socket accepted = null;
  97                         if (args.SocketError == SocketError.Success)
  98                                 accepted = args.AcceptSocket;
  99
 100                         EndPointListener epl = (EndPointListener) args.UserToken;
 101
 102
 103                         Accept (epl.sock, args);
 104                         if (accepted == null)
 105                                 return;
 106
 107                         if (epl.secure && epl.cert == null) {
 108                                 accepted.Close ();
 109                                 return;
 110                         }
 111                         HttpConnection conn = new HttpConnection (accepted, epl, epl.secure, epl.cert);
 112                         lock (epl.unregistered) {
 113                                 epl.unregistered [conn] = conn;
 114                         }
 115                         conn.BeginReadRequest ();
 116                 }
 117
 118                 static void OnAccept (object sender, SocketAsyncEventArgs e)
 119                 {
 120                         ProcessAccept (e);
 121                 }
 122
 123                 internal void RemoveConnection (HttpConnection conn)
 124                 {
 125                         lock (unregistered) {
 126                                 unregistered.Remove (conn);
 127                         }
 128                 }
 129
 130                 public bool BindContext (HttpListenerContext context)
 131                 {
 132                         HttpListenerRequest req = context.Request;
 133                         ListenerPrefix prefix;
 134                         HttpListener listener = SearchListener (req.Url, out prefix);
 135                         if (listener == null)
 136                                 return false;
 137
 138                         context.Listener = listener;
 139                         context.Connection.Prefix = prefix;
 140                         return true;
 141                 }
 142
 143                 public void UnbindContext (HttpListenerContext context)
 144                 {
 145                         if (context == null || context.Request == null)
 146                                 return;
 147
 148                         context.Listener.UnregisterContext (context);
 149                 }
 150
 151                 HttpListener SearchListener (Uri uri, out ListenerPrefix prefix)
 152                 {
 153                         prefix = null;
 154                         if (uri == null)
 155                                 return null;
 156
 157                         string host = uri.Host;
 158                         int port = uri.Port;
 159                         string path = WebUtility.UrlDecode (uri.AbsolutePath);
 160                         string path_slash = path [path.Length - 1] == '/' ? path : path + "/";
 161
 162                         HttpListener best_match = null;
 163                         int best_length = -1;
 164
 165                         if (host != null && host != "") {
 166                                 Hashtable p_ro = prefixes;
 167                                 foreach (ListenerPrefix p in p_ro.Keys) {
 168                                         string ppath = p.Path;
 169                                         if (ppath.Length < best_length)
 170                                                 continue;
 171
 172                                         if (p.Host != host || p.Port != port)
 173                                                 continue;
 174
 175                                         if (path.StartsWith (ppath) || path_slash.StartsWith (ppath)) {
 176                                                 best_length = ppath.Length;
 177                                                 best_match = (HttpListener) p_ro [p];
 178                                                 prefix = p;
 179                                         }
 180                                 }
 181                                 if (best_length != -1)
 182                                         return best_match;
 183                         }
 184
 185                         ArrayList list = unhandled;
 186                         best_match = MatchFromList (host, path, list, out prefix);
 187                         if (path != path_slash && best_match == null)
 188                                 best_match = MatchFromList (host, path_slash, list, out prefix);
 189                         if (best_match != null)
 190                                 return best_match;
 191
 192                         list = all;
 193                         best_match = MatchFromList (host, path, list, out prefix);
 194                         if (path != path_slash && best_match == null)
 195                                 best_match = MatchFromList (host, path_slash, list, out prefix);
 196                         if (best_match != null)
 197                                 return best_match;
 198
 199                         return null;
 200                 }
 201
 202                 HttpListener MatchFromList (string host, string path, ArrayList list, out ListenerPrefix prefix)
 203                 {
 204                         prefix = null;
 205                         if (list == null)
 206                                 return null;
 207
 208                         HttpListener best_match = null;
 209                         int best_length = -1;
 210
 211                         foreach (ListenerPrefix p in list) {
 212                                 string ppath = p.Path;
 213                                 if (ppath.Length < best_length)
 214                                         continue;
 215
 216                                 if (path.StartsWith (ppath)) {
 217                                         best_length = ppath.Length;
 218                                         best_match = p.Listener;
 219                                         prefix = p;
 220                                 }
 221                         }
 222
 223                         return best_match;
 224                 }
 225
 226                 void AddSpecial (ArrayList coll, ListenerPrefix prefix)
 227                 {
 228                         if (coll == null)
 229                                 return;
 230
 231                         foreach (ListenerPrefix p in coll) {
 232                                 if (p.Path == prefix.Path) //TODO: code
 233                                         throw new HttpListenerException (400, "Prefix already in use.");
 234                         }
 235                         coll.Add (prefix);
 236                 }
 237
 238                 bool RemoveSpecial (ArrayList coll, ListenerPrefix prefix)
 239                 {
 240                         if (coll == null)
 241                                 return false;
 242
 243                         int c = coll.Count;
 244                         for (int i = 0; i < c; i++) {
 245                                 ListenerPrefix p = (ListenerPrefix) coll [i];
 246                                 if (p.Path == prefix.Path) {
 247                                         coll.RemoveAt (i);
 248                                         return true;
 249                                 }
 250                         }
 251                         return false;
 252                 }
 253
 254                 void CheckIfRemove ()
 255                 {
 256                         if (prefixes.Count > 0)
 257                                 return;
 258
 259                         ArrayList list = unhandled;
 260                         if (list != null && list.Count > 0)
 261                                 return;
 262
 263                         list = all;
 264                         if (list != null && list.Count > 0)
 265                                 return;
 266
 267                         EndPointManager.RemoveEndPoint (this, endpoint);
 268                 }
 269
 270                 public void Close ()
 271                 {
 272                         sock.Close ();
 273                         lock (unregistered) {
 274                                 //
 275                                 // Clone the list because RemoveConnection can be called from Close
 276                                 //
 277                                 var connections = new List<HttpConnection> (unregistered.Keys);
 278
 279                                 foreach (HttpConnection c in connections)
 280                                         c.Close (true);
 281                                 unregistered.Clear ();
 282                         }
 283                 }
 284
 285                 public void AddPrefix (ListenerPrefix prefix, HttpListener listener)
 286                 {
 287                         ArrayList current;
 288                         ArrayList future;
 289                         if (prefix.Host == "*") {
 290                                 do {
 291                                         current = unhandled;
 292                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 293                                         prefix.Listener = listener;
 294                                         AddSpecial (future, prefix);
 295                                 } while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
 296                                 return;
 297                         }
 298
 299                         if (prefix.Host == "+") {
 300                                 do {
 301                                         current = all;
 302                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 303                                         prefix.Listener = listener;
 304                                         AddSpecial (future, prefix);
 305                                 } while (Interlocked.CompareExchange (ref all, future, current) != current);
 306                                 return;
 307                         }
 308
 309                         Hashtable prefs, p2;
 310                         do {
 311                                 prefs = prefixes;
 312                                 if (prefs.ContainsKey (prefix)) {
 313                                         HttpListener other = (HttpListener) prefs [prefix];
 314                                         if (other != listener) // TODO: code.
 315                                                 throw new HttpListenerException (400, "There's another listener for " + prefix);
 316                                         return;
 317                                 }
 318                                 p2 = (Hashtable) prefs.Clone ();
 319                                 p2 [prefix] = listener;
 320                         } while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
 321                 }
 322
 323                 public void RemovePrefix (ListenerPrefix prefix, HttpListener listener)
 324                 {
 325                         ArrayList current;
 326                         ArrayList future;
 327                         if (prefix.Host == "*") {
 328                                 do {
 329                                         current = unhandled;
 330                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 331                                         if (!RemoveSpecial (future, prefix))
 332                                                 break; // Prefix not found
 333                                 } while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
 334                                 CheckIfRemove ();
 335                                 return;
 336                         }
 337
 338                         if (prefix.Host == "+") {
 339                                 do {
 340                                         current = all;
 341                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 342                                         if (!RemoveSpecial (future, prefix))
 343                                                 break; // Prefix not found
 344                                 } while (Interlocked.CompareExchange (ref all, future, current) != current);
 345                                 CheckIfRemove ();
 346                                 return;
 347                         }
 348
 349                         Hashtable prefs, p2;
 350                         do {
 351                                 prefs = prefixes;
 352                                 if (!prefs.ContainsKey (prefix))
 353                                         break;
 354
 355                                 p2 = (Hashtable) prefs.Clone ();
 356                                 p2.Remove (prefix);
 357                         } while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
 358                         CheckIfRemove ();
 359                 }
 360         }
 361 }
 362 #endif
 363