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 NET_2_0 && SECURITY_DEP
  31
  32 using System.IO;
  33 using System.Net.Sockets;
  34 using System.Collections;
  35 using System.Security.Cryptography;
  36 using System.Security.Cryptography.X509Certificates;
  37 using System.Threading;
  38 using Mono.Security.Authenticode;
  39
  40 namespace System.Net {
  41         sealed class EndPointListener
  42         {
  43                 IPEndPoint endpoint;
  44                 Socket sock;
  45                 Hashtable prefixes;  // Dictionary <ListenerPrefix, HttpListener>
  46                 ArrayList unhandled; // List<ListenerPrefix> unhandled; host = '*'
  47                 ArrayList all;       // List<ListenerPrefix> all;  host = '+'
  48                 X509Certificate2 cert;
  49                 AsymmetricAlgorithm key;
  50                 bool secure;
  51                 Hashtable unregistered;
  52
  53                 public EndPointListener (IPAddress addr, int port, bool secure)
  54                 {
  55                         if (secure) {
  56                                 this.secure = secure;
  57                                 LoadCertificateAndKey (addr, port);
  58                         }
  59
  60                         endpoint = new IPEndPoint (addr, port);
  61                         sock = new Socket (addr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
  62                         sock.Bind (endpoint);
  63                         sock.Listen (500);
  64                         SocketAsyncEventArgs args = new SocketAsyncEventArgs ();
  65                         args.UserToken = this;
  66                         args.Completed += OnAccept;
  67                         sock.AcceptAsync (args);
  68                         prefixes = new Hashtable ();
  69                         unregistered = new Hashtable ();
  70                 }
  71
  72                 void LoadCertificateAndKey (IPAddress addr, int port)
  73                 {
  74                         // Actually load the certificate
  75                         try {
  76                                 string dirname = Environment.GetFolderPath (Environment.SpecialFolder.ApplicationData);
  77                                 string path = Path.Combine (dirname, ".mono");
  78                                 path = Path.Combine (path, "httplistener");
  79                                 string cert_file = Path.Combine (path, String.Format ("{0}.cer", port));
  80                                 if (!File.Exists (cert_file))
  81                                         return;
  82                                 string pvk_file = Path.Combine (path, String.Format ("{0}.pvk", port));
  83                                 if (!File.Exists (pvk_file))
  84                                         return;
  85                                 cert = new X509Certificate2 (cert_file);
  86                                 key = PrivateKey.CreateFromFile (pvk_file).RSA;
  87                         } catch {
  88                                 // ignore errors
  89                         }
  90                 }
  91
  92                 static void OnAccept (object sender, EventArgs e)
  93                 {
  94                         SocketAsyncEventArgs args = (SocketAsyncEventArgs) e;
  95                         EndPointListener epl = (EndPointListener) args.UserToken;
  96                         Socket accepted = null;
  97                         if (args.SocketError == SocketError.Success) {
  98                                 accepted = args.AcceptSocket;
  99                                 args.AcceptSocket = null;
 100                         }
 101
 102                         try {
 103                                 if (epl.sock != null)
 104                                         epl.sock.AcceptAsync (args);
 105                         } catch {
 106                                 if (accepted != null) {
 107                                         try {
 108                                                 accepted.Close ();
 109                                         } catch {}
 110                                         accepted = null;
 111                                 }
 112                         }
 113
 114                         if (accepted == null)
 115                                 return;
 116
 117                         if (epl.secure && (epl.cert == null || epl.key == null)) {
 118                                 accepted.Close ();
 119                                 return;
 120                         }
 121                         HttpConnection conn = new HttpConnection (accepted, epl, epl.secure, epl.cert, epl.key);
 122                         lock (epl.unregistered) {
 123                                 epl.unregistered [conn] = conn;
 124                         }
 125                         conn.BeginReadRequest ();
 126                 }
 127
 128                 internal void RemoveConnection (HttpConnection conn)
 129                 {
 130                         lock (unregistered) {
 131                                 unregistered.Remove (conn);
 132                         }
 133                 }
 134
 135                 public bool BindContext (HttpListenerContext context)
 136                 {
 137                         HttpListenerRequest req = context.Request;
 138                         ListenerPrefix prefix;
 139                         HttpListener listener = SearchListener (req.Url, out prefix);
 140                         if (listener == null)
 141                                 return false;
 142
 143                         context.Listener = listener;
 144                         context.Connection.Prefix = prefix;
 145                         return true;
 146                 }
 147
 148                 public void UnbindContext (HttpListenerContext context)
 149                 {
 150                         if (context == null || context.Request == null)
 151                                 return;
 152
 153                         context.Listener.UnregisterContext (context);
 154                 }
 155
 156                 HttpListener SearchListener (Uri uri, out ListenerPrefix prefix)
 157                 {
 158                         prefix = null;
 159                         if (uri == null)
 160                                 return null;
 161
 162                         string host = uri.Host;
 163                         int port = uri.Port;
 164                         string path = HttpUtility.UrlDecode (uri.AbsolutePath);
 165                         string path_slash = path [path.Length - 1] == '/' ? path : path + "/";
 166
 167                         HttpListener best_match = null;
 168                         int best_length = -1;
 169
 170                         if (host != null && host != "") {
 171                                 Hashtable p_ro = prefixes;
 172                                 foreach (ListenerPrefix p in p_ro.Keys) {
 173                                         string ppath = p.Path;
 174                                         if (ppath.Length < best_length)
 175                                                 continue;
 176
 177                                         if (p.Host != host || p.Port != port)
 178                                                 continue;
 179
 180                                         if (path.StartsWith (ppath) || path_slash.StartsWith (ppath)) {
 181                                                 best_length = ppath.Length;
 182                                                 best_match = (HttpListener) p_ro [p];
 183                                                 prefix = p;
 184                                         }
 185                                 }
 186                                 if (best_length != -1)
 187                                         return best_match;
 188                         }
 189
 190                         ArrayList list = unhandled;
 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                         list = all;
 198                         best_match = MatchFromList (host, path, list, out prefix);
 199                         if (path != path_slash && best_match == null)
 200                                 best_match = MatchFromList (host, path_slash, list, out prefix);
 201                         if (best_match != null)
 202                                 return best_match;
 203
 204                         return null;
 205                 }
 206
 207                 HttpListener MatchFromList (string host, string path, ArrayList list, out ListenerPrefix prefix)
 208                 {
 209                         prefix = null;
 210                         if (list == null)
 211                                 return null;
 212
 213                         HttpListener best_match = null;
 214                         int best_length = -1;
 215
 216                         foreach (ListenerPrefix p in list) {
 217                                 string ppath = p.Path;
 218                                 if (ppath.Length < best_length)
 219                                         continue;
 220
 221                                 if (path.StartsWith (ppath)) {
 222                                         best_length = ppath.Length;
 223                                         best_match = p.Listener;
 224                                         prefix = p;
 225                                 }
 226                         }
 227
 228                         return best_match;
 229                 }
 230
 231                 void AddSpecial (ArrayList coll, ListenerPrefix prefix)
 232                 {
 233                         if (coll == null)
 234                                 return;
 235
 236                         foreach (ListenerPrefix p in coll) {
 237                                 if (p.Path == prefix.Path) //TODO: code
 238                                         throw new HttpListenerException (400, "Prefix already in use.");
 239                         }
 240                         coll.Add (prefix);
 241                 }
 242
 243                 bool RemoveSpecial (ArrayList coll, ListenerPrefix prefix)
 244                 {
 245                         if (coll == null)
 246                                 return false;
 247
 248                         int c = coll.Count;
 249                         for (int i = 0; i < c; i++) {
 250                                 ListenerPrefix p = (ListenerPrefix) coll [i];
 251                                 if (p.Path == prefix.Path) {
 252                                         coll.RemoveAt (i);
 253                                         return true;
 254                                 }
 255                         }
 256                         return false;
 257                 }
 258
 259                 void CheckIfRemove ()
 260                 {
 261                         if (prefixes.Count > 0)
 262                                 return;
 263
 264                         ArrayList list = unhandled;
 265                         if (list != null && list.Count > 0)
 266                                 return;
 267
 268                         list = all;
 269                         if (list != null && list.Count > 0)
 270                                 return;
 271
 272                         EndPointManager.RemoveEndPoint (this, endpoint);
 273                 }
 274
 275                 public void Close ()
 276                 {
 277                         sock.Close ();
 278                         lock (unregistered) {
 279                                 foreach (HttpConnection c in unregistered.Keys)
 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