mcs/class/System/System.Net/HttpConnection.cs

   1 //
   2 // System.Net.HttpConnection
   3 //
   4 // Author:
   5 //      Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
   6 //
   7 // Copyright (c) 2005-2009 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 MONOTOUCH || MONODROID
  33 using Mono.Security.Protocol.Tls;
  34 #else
  35 extern alias MonoSecurity;
  36 using MonoSecurity::Mono.Security.Protocol.Tls;
  37 #endif
  38
  39 using System.IO;
  40 using System.Net.Sockets;
  41 using System.Reflection;
  42 using System.Text;
  43 using System.Threading;
  44 using System.Security.Cryptography;
  45 using System.Security.Cryptography.X509Certificates;
  46
  47 namespace System.Net {
  48         sealed class HttpConnection
  49         {
  50                 static AsyncCallback onread_cb = new AsyncCallback (OnRead);
  51                 const int BufferSize = 8192;
  52                 Socket sock;
  53                 Stream stream;
  54                 EndPointListener epl;
  55                 MemoryStream ms;
  56                 byte [] buffer;
  57                 HttpListenerContext context;
  58                 StringBuilder current_line;
  59                 ListenerPrefix prefix;
  60                 RequestStream i_stream;
  61                 ResponseStream o_stream;
  62                 bool chunked;
  63                 int reuses;
  64                 bool context_bound;
  65                 bool secure;
  66                 AsymmetricAlgorithm key;
  67                 int s_timeout = 90000; // 90k ms for first request, 15k ms from then on
  68                 Timer timer;
  69                 IPEndPoint local_ep;
  70                 HttpListener last_listener;
  71                 int [] client_cert_errors;
  72                 X509Certificate2 client_cert;
  73
  74                 public HttpConnection (Socket sock, EndPointListener epl, bool secure, X509Certificate2 cert, AsymmetricAlgorithm key)
  75                 {
  76                         this.sock = sock;
  77                         this.epl = epl;
  78                         this.secure = secure;
  79                         this.key = key;
  80                         if (secure == false) {
  81                                 stream = new NetworkStream (sock, false);
  82                         } else {
  83                                 SslServerStream ssl_stream = new SslServerStream (new NetworkStream (sock, false), cert, false, true, false);
  84                                 ssl_stream.PrivateKeyCertSelectionDelegate += OnPVKSelection;
  85                                 ssl_stream.ClientCertValidationDelegate += OnClientCertificateValidation;
  86                                 stream = ssl_stream;
  87                         }
  88                         timer = new Timer (OnTimeout, null, Timeout.Infinite, Timeout.Infinite);
  89                         Init ();
  90                 }
  91
  92                 internal int [] ClientCertificateErrors {
  93                         get { return client_cert_errors; }
  94                 }
  95
  96                 internal X509Certificate2 ClientCertificate {
  97                         get { return client_cert; }
  98                 }
  99
 100                 bool OnClientCertificateValidation (X509Certificate certificate, int[] errors)
 101                 {
 102                         if (certificate == null)
 103                                 return true;
 104                         X509Certificate2 cert = certificate as X509Certificate2;
 105                         if (cert == null)
 106                                 cert = new X509Certificate2 (certificate.GetRawCertData ());
 107                         client_cert = cert;
 108                         client_cert_errors = errors;
 109                         return true;
 110                 }
 111
 112                 AsymmetricAlgorithm OnPVKSelection (X509Certificate certificate, string targetHost)
 113                 {
 114                         return key;
 115                 }
 116
 117                 void Init ()
 118                 {
 119                         context_bound = false;
 120                         i_stream = null;
 121                         o_stream = null;
 122                         prefix = null;
 123                         chunked = false;
 124                         ms = new MemoryStream ();
 125                         position = 0;
 126                         input_state = InputState.RequestLine;
 127                         line_state = LineState.None;
 128                         context = new HttpListenerContext (this);
 129                 }
 130
 131                 public bool IsClosed {
 132                         get { return (sock == null); }
 133                 }
 134
 135                 public int Reuses {
 136                         get { return reuses; }
 137                 }
 138
 139                 public IPEndPoint LocalEndPoint {
 140                         get {
 141                                 if (local_ep != null)
 142                                         return local_ep;
 143
 144                                 local_ep = (IPEndPoint) sock.LocalEndPoint;
 145                                 return local_ep;
 146                         }
 147                 }
 148
 149                 public IPEndPoint RemoteEndPoint {
 150                         get { return (IPEndPoint) sock.RemoteEndPoint; }
 151                 }
 152
 153                 public bool IsSecure {
 154                         get { return secure; }
 155                 }
 156
 157                 public ListenerPrefix Prefix {
 158                         get { return prefix; }
 159                         set { prefix = value; }
 160                 }
 161
 162                 void OnTimeout (object unused)
 163                 {
 164                         CloseSocket ();
 165                         Unbind ();
 166                 }
 167
 168                 public void BeginReadRequest ()
 169                 {
 170                         if (buffer == null)
 171                                 buffer = new byte [BufferSize];
 172                         try {
 173                                 if (reuses == 1)
 174                                         s_timeout = 15000;
 175                                 timer.Change (s_timeout, Timeout.Infinite);
 176                                 stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 177                         } catch {
 178                                 timer.Change (Timeout.Infinite, Timeout.Infinite);
 179                                 CloseSocket ();
 180                                 Unbind ();
 181                         }
 182                 }
 183
 184                 public RequestStream GetRequestStream (bool chunked, long contentlength)
 185                 {
 186                         if (i_stream == null) {
 187                                 byte [] buffer = ms.GetBuffer ();
 188                                 int length = (int) ms.Length;
 189                                 ms = null;
 190                                 if (chunked) {
 191                                         this.chunked = true;
 192                                         context.Response.SendChunked = true;
 193                                         i_stream = new ChunkedInputStream (context, stream, buffer, position, length - position);
 194                                 } else {
 195                                         i_stream = new RequestStream (stream, buffer, position, length - position, contentlength);
 196                                 }
 197                         }
 198                         return i_stream;
 199                 }
 200
 201                 public ResponseStream GetResponseStream ()
 202                 {
 203                         // TODO: can we get this stream before reading the input?
 204                         if (o_stream == null) {
 205                                 HttpListener listener = context.Listener;
 206                                 bool ign = (listener == null) ? true : listener.IgnoreWriteExceptions;
 207                                 o_stream = new ResponseStream (stream, context.Response, ign);
 208                         }
 209                         return o_stream;
 210                 }
 211
 212                 static void OnRead (IAsyncResult ares)
 213                 {
 214                         HttpConnection cnc = (HttpConnection) ares.AsyncState;
 215                         cnc.OnReadInternal (ares);
 216                 }
 217
 218                 void OnReadInternal (IAsyncResult ares)
 219                 {
 220                         timer.Change (Timeout.Infinite, Timeout.Infinite);
 221                         int nread = -1;
 222                         try {
 223                                 nread = stream.EndRead (ares);
 224                                 ms.Write (buffer, 0, nread);
 225                                 if (ms.Length > 32768) {
 226                                         SendError ("Bad request", 400);
 227                                         Close (true);
 228                                         return;
 229                                 }
 230                         } catch {
 231                                 if (ms != null && ms.Length > 0)
 232                                         SendError ();
 233                                 if (sock != null) {
 234                                         CloseSocket ();
 235                                         Unbind ();
 236                                 }
 237                                 return;
 238                         }
 239
 240                         if (nread == 0) {
 241                                 //if (ms.Length > 0)
 242                                 //      SendError (); // Why bother?
 243                                 CloseSocket ();
 244                                 Unbind ();
 245                                 return;
 246                         }
 247
 248                         if (ProcessInput (ms)) {
 249                                 if (!context.HaveError)
 250                                         context.Request.FinishInitialization ();
 251
 252                                 if (context.HaveError) {
 253                                         SendError ();
 254                                         Close (true);
 255                                         return;
 256                                 }
 257
 258                                 if (!epl.BindContext (context)) {
 259                                         SendError ("Invalid host", 400);
 260                                         Close (true);
 261                                         return;
 262                                 }
 263                                 HttpListener listener = context.Listener;
 264                                 if (last_listener != listener) {
 265                                         RemoveConnection ();
 266                                         listener.AddConnection (this);
 267                                         last_listener = listener;
 268                                 }
 269
 270                                 context_bound = true;
 271                                 listener.RegisterContext (context);
 272                                 return;
 273                         }
 274                         stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 275                 }
 276
 277                 void RemoveConnection ()
 278                 {
 279                         if (last_listener == null)
 280                                 epl.RemoveConnection (this);
 281                         else
 282                                 last_listener.RemoveConnection (this);
 283                 }
 284
 285                 enum InputState {
 286                         RequestLine,
 287                         Headers
 288                 }
 289
 290                 enum LineState {
 291                         None,
 292                         CR,
 293                         LF
 294                 }
 295
 296                 InputState input_state = InputState.RequestLine;
 297                 LineState line_state = LineState.None;
 298                 int position;
 299
 300                 // true -> done processing
 301                 // false -> need more input
 302                 bool ProcessInput (MemoryStream ms)
 303                 {
 304                         byte [] buffer = ms.GetBuffer ();
 305                         int len = (int) ms.Length;
 306                         int used = 0;
 307                         string line;
 308
 309                         try {
 310                                 line = ReadLine (buffer, position, len - position, ref used);
 311                                 position += used;
 312                         } catch {
 313                                 context.ErrorMessage = "Bad request";
 314                                 context.ErrorStatus = 400;
 315                                 return true;
 316                         }
 317
 318                         do {
 319                                 if (line == null)
 320                                         break;
 321                                 if (line == "") {
 322                                         if (input_state == InputState.RequestLine)
 323                                                 continue;
 324                                         current_line = null;
 325                                         ms = null;
 326                                         return true;
 327                                 }
 328
 329                                 if (input_state == InputState.RequestLine) {
 330                                         context.Request.SetRequestLine (line);
 331                                         input_state = InputState.Headers;
 332                                 } else {
 333                                         try {
 334                                                 context.Request.AddHeader (line);
 335                                         } catch (Exception e) {
 336                                                 context.ErrorMessage = e.Message;
 337                                                 context.ErrorStatus = 400;
 338                                                 return true;
 339                                         }
 340                                 }
 341
 342                                 if (context.HaveError)
 343                                         return true;
 344
 345                                 if (position >= len)
 346                                         break;
 347                                 try {
 348                                         line = ReadLine (buffer, position, len - position, ref used);
 349                                         position += used;
 350                                 } catch {
 351                                         context.ErrorMessage = "Bad request";
 352                                         context.ErrorStatus = 400;
 353                                         return true;
 354                                 }
 355                         } while (line != null);
 356
 357                         if (used == len) {
 358                                 ms.SetLength (0);
 359                                 position = 0;
 360                         }
 361                         return false;
 362                 }
 363
 364                 string ReadLine (byte [] buffer, int offset, int len, ref int used)
 365                 {
 366                         if (current_line == null)
 367                                 current_line = new StringBuilder (128);
 368                         int last = offset + len;
 369                         used = 0;
 370                         for (int i = offset; i < last && line_state != LineState.LF; i++) {
 371                                 used++;
 372                                 byte b = buffer [i];
 373                                 if (b == 13) {
 374                                         line_state = LineState.CR;
 375                                 } else if (b == 10) {
 376                                         line_state = LineState.LF;
 377                                 } else {
 378                                         current_line.Append ((char) b);
 379                                 }
 380                         }
 381
 382                         string result = null;
 383                         if (line_state == LineState.LF) {
 384                                 line_state = LineState.None;
 385                                 result = current_line.ToString ();
 386                                 current_line.Length = 0;
 387                         }
 388
 389                         return result;
 390                 }
 391
 392                 public void SendError (string msg, int status)
 393                 {
 394                         try {
 395                                 HttpListenerResponse response = context.Response;
 396                                 response.StatusCode = status;
 397                                 response.ContentType = "text/html";
 398                                 string description = HttpListenerResponse.GetStatusDescription (status);
 399                                 string str;
 400                                 if (msg != null)
 401                                         str = String.Format ("<h1>{0} ({1})</h1>", description, msg);
 402                                 else
 403                                         str = String.Format ("<h1>{0}</h1>", description);
 404
 405                                 byte [] error = context.Response.ContentEncoding.GetBytes (str);
 406                                 response.Close (error, false);
 407                         } catch {
 408                                 // response was already closed
 409                         }
 410                 }
 411
 412                 public void SendError ()
 413                 {
 414                         SendError (context.ErrorMessage, context.ErrorStatus);
 415                 }
 416
 417                 void Unbind ()
 418                 {
 419                         if (context_bound) {
 420                                 epl.UnbindContext (context);
 421                                 context_bound = false;
 422                         }
 423                 }
 424
 425                 public void Close ()
 426                 {
 427                         Close (false);
 428                 }
 429
 430                 void CloseSocket ()
 431                 {
 432                         if (sock == null)
 433                                 return;
 434
 435                         try {
 436                                 sock.Close ();
 437                         } catch {
 438                         } finally {
 439                                 sock = null;
 440                         }
 441                         RemoveConnection ();
 442                 }
 443
 444                 internal void Close (bool force_close)
 445                 {
 446                         if (sock != null) {
 447                                 Stream st = GetResponseStream ();
 448                                 if (st != null)
 449                                         st.Close ();
 450
 451                                 o_stream = null;
 452                         }
 453
 454                         if (sock != null) {
 455                                 force_close |= !context.Request.KeepAlive;
 456                                 if (!force_close)
 457                                         force_close = (context.Response.Headers ["connection"] == "close");
 458                                 /*
 459                                 if (!force_close) {
 460 //                                      bool conn_close = (status_code == 400 || status_code == 408 || status_code == 411 ||
 461 //                                                      status_code == 413 || status_code == 414 || status_code == 500 ||
 462 //                                                      status_code == 503);
 463
 464                                         force_close |= (context.Request.ProtocolVersion <= HttpVersion.Version10);
 465                                 }
 466                                 */
 467
 468                                 if (!force_close && context.Request.FlushInput ()) {
 469                                         if (chunked && context.Response.ForceCloseChunked == false) {
 470                                                 // Don't close. Keep working.
 471                                                 reuses++;
 472                                                 Unbind ();
 473                                                 Init ();
 474                                                 BeginReadRequest ();
 475                                                 return;
 476                                         }
 477
 478                                         reuses++;
 479                                         Unbind ();
 480                                         Init ();
 481                                         BeginReadRequest ();
 482                                         return;
 483                                 }
 484
 485                                 Socket s = sock;
 486                                 sock = null;
 487                                 try {
 488                                         if (s != null)
 489                                                 s.Shutdown (SocketShutdown.Both);
 490                                 } catch {
 491                                 } finally {
 492                                         if (s != null)
 493                                                 s.Close ();
 494                                 }
 495                                 Unbind ();
 496                                 RemoveConnection ();
 497                                 return;
 498                         }
 499                 }
 500         }
 501 }
 502 #endif
 503