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 extern alias MonoSecurity;
  33
  34 using System.IO;
  35 using System.Net.Sockets;
  36 using System.Collections;
  37 using System.Collections.Generic;
  38 using System.Security.Cryptography;
  39 using System.Security.Cryptography.X509Certificates;
  40 using System.Threading;
  41 using MonoSecurity::Mono.Security.Authenticode;
  42
  43 namespace System.Net {
  44         sealed class EndPointListener
  45         {
  46                 IPEndPoint endpoint;
  47                 Socket sock;
  48                 Hashtable prefixes;  // Dictionary <ListenerPrefix, HttpListener>
  49                 ArrayList unhandled; // List<ListenerPrefix> unhandled; host = '*'
  50                 ArrayList all;       // List<ListenerPrefix> all;  host = '+'
  51                 X509Certificate2 cert;
  52                 AsymmetricAlgorithm key;
  53                 bool secure;
  54                 Dictionary<HttpConnection, HttpConnection> unregistered;
  55
  56                 public EndPointListener (IPAddress addr, int port, bool secure)
  57                 {
  58                         if (secure) {
  59                                 this.secure = secure;
  60                                 LoadCertificateAndKey (addr, port);
  61                         }
  62
  63                         endpoint = new IPEndPoint (addr, port);
  64                         sock = new Socket (addr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
  65                         sock.Bind (endpoint);
  66                         sock.Listen (500);
  67                         SocketAsyncEventArgs args = new SocketAsyncEventArgs ();
  68                         args.UserToken = this;
  69                         args.Completed += OnAccept;
  70                         sock.AcceptAsync (args);
  71                         prefixes = new Hashtable ();
  72                         unregistered = new Dictionary<HttpConnection, HttpConnection> ();
  73                 }
  74
  75                 void LoadCertificateAndKey (IPAddress addr, int port)
  76                 {
  77                         // Actually load the certificate
  78                         try {
  79                                 string dirname = Environment.GetFolderPath (Environment.SpecialFolder.ApplicationData);
  80                                 string path = Path.Combine (dirname, ".mono");
  81                                 path = Path.Combine (path, "httplistener");
  82                                 string cert_file = Path.Combine (path, String.Format ("{0}.cer", port));
  83                                 if (!File.Exists (cert_file))
  84                                         return;
  85                                 string pvk_file = Path.Combine (path, String.Format ("{0}.pvk", port));
  86                                 if (!File.Exists (pvk_file))
  87                                         return;
  88                                 cert = new X509Certificate2 (cert_file);
  89                                 key = PrivateKey.CreateFromFile (pvk_file).RSA;
  90                         } catch {
  91                                 // ignore errors
  92                         }
  93                 }
  94
  95                 static void OnAccept (object sender, EventArgs e)
  96                 {
  97                         SocketAsyncEventArgs args = (SocketAsyncEventArgs) e;
  98                         EndPointListener epl = (EndPointListener) args.UserToken;
  99                         Socket accepted = null;
 100                         if (args.SocketError == SocketError.Success) {
 101                                 accepted = args.AcceptSocket;
 102                                 args.AcceptSocket = null;
 103                         }
 104
 105                         try {
 106                                 if (epl.sock != null)
 107                                         epl.sock.AcceptAsync (args);
 108                         } catch {
 109                                 if (accepted != null) {
 110                                         try {
 111                                                 accepted.Close ();
 112                                         } catch {}
 113                                         accepted = null;
 114                                 }
 115                         }
 116
 117                         if (accepted == null)
 118                                 return;
 119
 120                         if (epl.secure && (epl.cert == null || epl.key == null)) {
 121                                 accepted.Close ();
 122                                 return;
 123                         }
 124                         HttpConnection conn = new HttpConnection (accepted, epl, epl.secure, epl.cert, epl.key);
 125                         lock (epl.unregistered) {
 126                                 epl.unregistered [conn] = conn;
 127                         }
 128                         conn.BeginReadRequest ();
 129                 }
 130
 131                 internal void RemoveConnection (HttpConnection conn)
 132                 {
 133                         lock (unregistered) {
 134                                 unregistered.Remove (conn);
 135                         }
 136                 }
 137
 138                 public bool BindContext (HttpListenerContext context)
 139                 {
 140                         HttpListenerRequest req = context.Request;
 141                         ListenerPrefix prefix;
 142                         HttpListener listener = SearchListener (req.Url, out prefix);
 143                         if (listener == null)
 144                                 return false;
 145
 146                         context.Listener = listener;
 147                         context.Connection.Prefix = prefix;
 148                         return true;
 149                 }
 150
 151                 public void UnbindContext (HttpListenerContext context)
 152                 {
 153                         if (context == null || context.Request == null)
 154                                 return;
 155
 156                         context.Listener.UnregisterContext (context);
 157                 }
 158
 159                 HttpListener SearchListener (Uri uri, out ListenerPrefix prefix)
 160                 {
 161                         prefix = null;
 162                         if (uri == null)
 163                                 return null;
 164
 165                         string host = uri.Host;
 166                         int port = uri.Port;
 167                         string path = HttpUtility.UrlDecode (uri.AbsolutePath);
 168                         string path_slash = path [path.Length - 1] == '/' ? path : path + "/";
 169
 170                         HttpListener best_match = null;
 171                         int best_length = -1;
 172
 173                         if (host != null && host != "") {
 174                                 Hashtable p_ro = prefixes;
 175                                 foreach (ListenerPrefix p in p_ro.Keys) {
 176                                         string ppath = p.Path;
 177                                         if (ppath.Length < best_length)
 178                                                 continue;
 179
 180                                         if (p.Host != host || p.Port != port)
 181                                                 continue;
 182
 183                                         if (path.StartsWith (ppath) || path_slash.StartsWith (ppath)) {
 184                                                 best_length = ppath.Length;
 185                                                 best_match = (HttpListener) p_ro [p];
 186                                                 prefix = p;
 187                                         }
 188                                 }
 189                                 if (best_length != -1)
 190                                         return best_match;
 191                         }
 192
 193                         ArrayList list = unhandled;
 194                         best_match = MatchFromList (host, path, list, out prefix);
 195                         if (path != path_slash && best_match == null)
 196                                 best_match = MatchFromList (host, path_slash, list, out prefix);
 197                         if (best_match != null)
 198                                 return best_match;
 199
 200                         list = all;
 201                         best_match = MatchFromList (host, path, list, out prefix);
 202                         if (path != path_slash && best_match == null)
 203                                 best_match = MatchFromList (host, path_slash, list, out prefix);
 204                         if (best_match != null)
 205                                 return best_match;
 206
 207                         return null;
 208                 }
 209
 210                 HttpListener MatchFromList (string host, string path, ArrayList list, out ListenerPrefix prefix)
 211                 {
 212                         prefix = null;
 213                         if (list == null)
 214                                 return null;
 215
 216                         HttpListener best_match = null;
 217                         int best_length = -1;
 218
 219                         foreach (ListenerPrefix p in list) {
 220                                 string ppath = p.Path;
 221                                 if (ppath.Length < best_length)
 222                                         continue;
 223
 224                                 if (path.StartsWith (ppath)) {
 225                                         best_length = ppath.Length;
 226                                         best_match = p.Listener;
 227                                         prefix = p;
 228                                 }
 229                         }
 230
 231                         return best_match;
 232                 }
 233
 234                 void AddSpecial (ArrayList coll, ListenerPrefix prefix)
 235                 {
 236                         if (coll == null)
 237                                 return;
 238
 239                         foreach (ListenerPrefix p in coll) {
 240                                 if (p.Path == prefix.Path) //TODO: code
 241                                         throw new HttpListenerException (400, "Prefix already in use.");
 242                         }
 243                         coll.Add (prefix);
 244                 }
 245
 246                 bool RemoveSpecial (ArrayList coll, ListenerPrefix prefix)
 247                 {
 248                         if (coll == null)
 249                                 return false;
 250
 251                         int c = coll.Count;
 252                         for (int i = 0; i < c; i++) {
 253                                 ListenerPrefix p = (ListenerPrefix) coll [i];
 254                                 if (p.Path == prefix.Path) {
 255                                         coll.RemoveAt (i);
 256                                         return true;
 257                                 }
 258                         }
 259                         return false;
 260                 }
 261
 262                 void CheckIfRemove ()
 263                 {
 264                         if (prefixes.Count > 0)
 265                                 return;
 266
 267                         ArrayList list = unhandled;
 268                         if (list != null && list.Count > 0)
 269                                 return;
 270
 271                         list = all;
 272                         if (list != null && list.Count > 0)
 273                                 return;
 274
 275                         EndPointManager.RemoveEndPoint (this, endpoint);
 276                 }
 277
 278                 public void Close ()
 279                 {
 280                         sock.Close ();
 281                         lock (unregistered) {
 282                                 //
 283                                 // Clone the list because RemoveConnection can be called from Close
 284                                 //
 285                                 var connections = new List<HttpConnection> (unregistered.Keys);
 286
 287                                 foreach (HttpConnection c in connections)
 288                                         c.Close (true);
 289                                 unregistered.Clear ();
 290                         }
 291                 }
 292
 293                 public void AddPrefix (ListenerPrefix prefix, HttpListener listener)
 294                 {
 295                         ArrayList current;
 296                         ArrayList future;
 297                         if (prefix.Host == "*") {
 298                                 do {
 299                                         current = unhandled;
 300                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 301                                         prefix.Listener = listener;
 302                                         AddSpecial (future, prefix);
 303                                 } while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
 304                                 return;
 305                         }
 306
 307                         if (prefix.Host == "+") {
 308                                 do {
 309                                         current = all;
 310                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 311                                         prefix.Listener = listener;
 312                                         AddSpecial (future, prefix);
 313                                 } while (Interlocked.CompareExchange (ref all, future, current) != current);
 314                                 return;
 315                         }
 316
 317                         Hashtable prefs, p2;
 318                         do {
 319                                 prefs = prefixes;
 320                                 if (prefs.ContainsKey (prefix)) {
 321                                         HttpListener other = (HttpListener) prefs [prefix];
 322                                         if (other != listener) // TODO: code.
 323                                                 throw new HttpListenerException (400, "There's another listener for " + prefix);
 324                                         return;
 325                                 }
 326                                 p2 = (Hashtable) prefs.Clone ();
 327                                 p2 [prefix] = listener;
 328                         } while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
 329                 }
 330
 331                 public void RemovePrefix (ListenerPrefix prefix, HttpListener listener)
 332                 {
 333                         ArrayList current;
 334                         ArrayList future;
 335                         if (prefix.Host == "*") {
 336                                 do {
 337                                         current = unhandled;
 338                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 339                                         if (!RemoveSpecial (future, prefix))
 340                                                 break; // Prefix not found
 341                                 } while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
 342                                 CheckIfRemove ();
 343                                 return;
 344                         }
 345
 346                         if (prefix.Host == "+") {
 347                                 do {
 348                                         current = all;
 349                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 350                                         if (!RemoveSpecial (future, prefix))
 351                                                 break; // Prefix not found
 352                                 } while (Interlocked.CompareExchange (ref all, future, current) != current);
 353                                 CheckIfRemove ();
 354                                 return;
 355                         }
 356
 357                         Hashtable prefs, p2;
 358                         do {
 359                                 prefs = prefixes;
 360                                 if (!prefs.ContainsKey (prefix))
 361                                         break;
 362
 363                                 p2 = (Hashtable) prefs.Clone ();
 364                                 p2.Remove (prefix);
 365                         } while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
 366                         CheckIfRemove ();
 367                 }
 368         }
 369 }
 370 #endif
 371