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

   1 //
   2 // System.Net.EndPointListener
   3 //
   4 // Author:
   5 //      Gonzalo Paniagua Javier (gonzalo@novell.com)
   6 //
   7 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_2_0 && SECURITY_DEP
  30
  31 using System.IO;
  32 using System.Net.Sockets;
  33 using System.Collections;
  34 using System.Security.Cryptography;
  35 using System.Security.Cryptography.X509Certificates;
  36 using System.Threading;
  37 using Mono.Security.Authenticode;
  38
  39 namespace System.Net {
  40         sealed class EndPointListener
  41         {
  42                 IPEndPoint endpoint;
  43                 Socket sock;
  44                 Hashtable prefixes;  // Dictionary <ListenerPrefix, HttpListener>
  45                 ArrayList unhandled; // List<ListenerPrefix> unhandled; host = '*'
  46                 ArrayList all;       // List<ListenerPrefix> all;  host = '+'
  47                 X509Certificate2 cert;
  48                 AsymmetricAlgorithm key;
  49                 bool secure;
  50                 Hashtable unregistered;
  51
  52                 public EndPointListener (IPAddress addr, int port, bool secure)
  53                 {
  54                         if (secure) {
  55                                 this.secure = secure;
  56                                 LoadCertificateAndKey (addr, port);
  57                         }
  58
  59                         endpoint = new IPEndPoint (addr, port);
  60                         sock = new Socket (addr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
  61                         sock.Bind (endpoint);
  62                         sock.Listen (500);
  63                         SocketAsyncEventArgs args = new SocketAsyncEventArgs ();
  64                         args.UserToken = this;
  65                         args.Completed += OnAccept;
  66                         sock.AcceptAsync (args);
  67                         prefixes = new Hashtable ();
  68                         unregistered = new Hashtable ();
  69                 }
  70
  71                 void LoadCertificateAndKey (IPAddress addr, int port)
  72                 {
  73                         // Actually load the certificate
  74                         try {
  75                                 string dirname = Environment.GetFolderPath (Environment.SpecialFolder.ApplicationData);
  76                                 string path = Path.Combine (dirname, ".mono");
  77                                 path = Path.Combine (path, "httplistener");
  78                                 string cert_file = Path.Combine (path, String.Format ("{0}.cer", port));
  79                                 string pvk_file = Path.Combine (path, String.Format ("{0}.pvk", port));
  80                                 cert = new X509Certificate2 (cert_file);
  81                                 key = PrivateKey.CreateFromFile (pvk_file).RSA;
  82                         } catch {
  83                                 // ignore errors
  84                         }
  85                 }
  86
  87                 static void OnAccept (object sender, EventArgs e)
  88                 {
  89                         SocketAsyncEventArgs args = (SocketAsyncEventArgs) e;
  90                         EndPointListener epl = (EndPointListener) args.UserToken;
  91                         Socket accepted = null;
  92                         if (args.SocketError == SocketError.Success) {
  93                                 accepted = args.AcceptSocket;
  94                                 args.AcceptSocket = null;
  95                         }
  96
  97                         try {
  98                                 if (epl.sock != null)
  99                                         epl.sock.AcceptAsync (args);
 100                         } catch {
 101                                 if (accepted != null) {
 102                                         try {
 103                                                 accepted.Close ();
 104                                         } catch {}
 105                                         accepted = null;
 106                                 }
 107                         }
 108
 109                         if (accepted == null)
 110                                 return;
 111
 112                         if (epl.secure && (epl.cert == null || epl.key == null)) {
 113                                 accepted.Close ();
 114                                 return;
 115                         }
 116                         HttpConnection conn = new HttpConnection (accepted, epl, epl.secure, epl.cert, epl.key);
 117                         lock (epl.unregistered) {
 118                                 epl.unregistered [conn] = conn;
 119                         }
 120                         conn.BeginReadRequest ();
 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 = HttpUtility.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                                 foreach (HttpConnection c in unregistered.Keys)
 275                                         c.Close (true);
 276                                 unregistered.Clear ();
 277                         }
 278                 }
 279
 280                 public void AddPrefix (ListenerPrefix prefix, HttpListener listener)
 281                 {
 282                         ArrayList current;
 283                         ArrayList future;
 284                         if (prefix.Host == "*") {
 285                                 do {
 286                                         current = unhandled;
 287                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 288                                         prefix.Listener = listener;
 289                                         AddSpecial (future, prefix);
 290                                 } while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
 291                                 return;
 292                         }
 293
 294                         if (prefix.Host == "+") {
 295                                 do {
 296                                         current = all;
 297                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 298                                         prefix.Listener = listener;
 299                                         AddSpecial (future, prefix);
 300                                 } while (Interlocked.CompareExchange (ref all, future, current) != current);
 301                                 return;
 302                         }
 303
 304                         Hashtable prefs, p2;
 305                         do {
 306                                 prefs = prefixes;
 307                                 if (prefs.ContainsKey (prefix)) {
 308                                         HttpListener other = (HttpListener) prefs [prefix];
 309                                         if (other != listener) // TODO: code.
 310                                                 throw new HttpListenerException (400, "There's another listener for " + prefix);
 311                                         return;
 312                                 }
 313                                 p2 = (Hashtable) prefs.Clone ();
 314                                 p2 [prefix] = listener;
 315                         } while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
 316                 }
 317
 318                 public void RemovePrefix (ListenerPrefix prefix, HttpListener listener)
 319                 {
 320                         ArrayList current;
 321                         ArrayList future;
 322                         if (prefix.Host == "*") {
 323                                 do {
 324                                         current = unhandled;
 325                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 326                                         if (!RemoveSpecial (future, prefix))
 327                                                 break; // Prefix not found
 328                                 } while (Interlocked.CompareExchange (ref unhandled, future, current) != current);
 329                                 CheckIfRemove ();
 330                                 return;
 331                         }
 332
 333                         if (prefix.Host == "+") {
 334                                 do {
 335                                         current = all;
 336                                         future = (current != null) ? (ArrayList) current.Clone () : new ArrayList ();
 337                                         if (!RemoveSpecial (future, prefix))
 338                                                 break; // Prefix not found
 339                                 } while (Interlocked.CompareExchange (ref all, future, current) != current);
 340                                 CheckIfRemove ();
 341                                 return;
 342                         }
 343
 344                         Hashtable prefs, p2;
 345                         do {
 346                                 prefs = prefixes;
 347                                 if (!prefs.ContainsKey (prefix))
 348                                         break;
 349
 350                                 p2 = (Hashtable) prefs.Clone ();
 351                                 p2.Remove (prefix);
 352                         } while (Interlocked.CompareExchange (ref prefixes, p2, prefs) != prefs);
 353                         CheckIfRemove ();
 354                 }
 355         }
 356 }
 357 #endif
 358