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 #if MONO_SECURITY_ALIAS
  32 extern alias MonoSecurity;
  33 #endif
  34
  35 #if MONO_SECURITY_ALIAS
  36 using MSI = MonoSecurity::Mono.Security.Interface;
  37 #else
  38 using MSI = Mono.Security.Interface;
  39 #endif
  40
  41 using System.IO;
  42 using System.Net.Sockets;
  43 using System.Text;
  44 using System.Threading;
  45 using System.Net.Security;
  46 using System.Security.Authentication;
  47 using System.Security.Cryptography;
  48 using System.Security.Cryptography.X509Certificates;
  49
  50 namespace System.Net {
  51         sealed class HttpConnection
  52         {
  53                 static AsyncCallback onread_cb = new AsyncCallback (OnRead);
  54                 const int BufferSize = 8192;
  55                 Socket sock;
  56                 Stream stream;
  57                 EndPointListener epl;
  58                 MemoryStream ms;
  59                 byte [] buffer;
  60                 HttpListenerContext context;
  61                 StringBuilder current_line;
  62                 ListenerPrefix prefix;
  63                 RequestStream i_stream;
  64                 ResponseStream o_stream;
  65                 bool chunked;
  66                 int reuses;
  67                 bool context_bound;
  68                 bool secure;
  69                 X509Certificate cert;
  70                 int s_timeout = 90000; // 90k ms for first request, 15k ms from then on
  71                 Timer timer;
  72                 IPEndPoint local_ep;
  73                 HttpListener last_listener;
  74                 int [] client_cert_errors;
  75                 X509Certificate2 client_cert;
  76                 SslStream ssl_stream;
  77
  78                 public HttpConnection (Socket sock, EndPointListener epl, bool secure, X509Certificate cert)
  79                 {
  80                         this.sock = sock;
  81                         this.epl = epl;
  82                         this.secure = secure;
  83                         this.cert = cert;
  84                         if (secure == false) {
  85                                 stream = new NetworkStream (sock, false);
  86                         } else {
  87                                 ssl_stream = epl.Listener.CreateSslStream (new NetworkStream (sock, false), false, (t, c, ch, e) => {
  88                                         if (c == null)
  89                                                 return true;
  90                                         var c2 = c as X509Certificate2;
  91                                         if (c2 == null)
  92                                                 c2 = new X509Certificate2 (c.GetRawCertData ());
  93                                         client_cert = c2;
  94                                         client_cert_errors = new int[] { (int)e };
  95                                         return true;
  96                                 });
  97                                 stream = ssl_stream;
  98                         }
  99                         timer = new Timer (OnTimeout, null, Timeout.Infinite, Timeout.Infinite);
 100                         Init ();
 101                 }
 102
 103                 internal SslStream SslStream {
 104                         get { return ssl_stream; }
 105                 }
 106
 107                 internal int [] ClientCertificateErrors {
 108                         get { return client_cert_errors; }
 109                 }
 110
 111                 internal X509Certificate2 ClientCertificate {
 112                         get { return client_cert; }
 113                 }
 114
 115                 void Init ()
 116                 {
 117                         if (ssl_stream != null) {
 118                                 ssl_stream.AuthenticateAsServer (cert, true, (SslProtocols)ServicePointManager.SecurityProtocol, false);
 119                         }
 120
 121                         context_bound = false;
 122                         i_stream = null;
 123                         o_stream = null;
 124                         prefix = null;
 125                         chunked = false;
 126                         ms = new MemoryStream ();
 127                         position = 0;
 128                         input_state = InputState.RequestLine;
 129                         line_state = LineState.None;
 130                         context = new HttpListenerContext (this);
 131                 }
 132
 133                 public bool IsClosed {
 134                         get { return (sock == null); }
 135                 }
 136
 137                 public int Reuses {
 138                         get { return reuses; }
 139                 }
 140
 141                 public IPEndPoint LocalEndPoint {
 142                         get {
 143                                 if (local_ep != null)
 144                                         return local_ep;
 145
 146                                 local_ep = (IPEndPoint) sock.LocalEndPoint;
 147                                 return local_ep;
 148                         }
 149                 }
 150
 151                 public IPEndPoint RemoteEndPoint {
 152                         get { return (IPEndPoint) sock.RemoteEndPoint; }
 153                 }
 154
 155                 public bool IsSecure {
 156                         get { return secure; }
 157                 }
 158
 159                 public ListenerPrefix Prefix {
 160                         get { return prefix; }
 161                         set { prefix = value; }
 162                 }
 163
 164                 void OnTimeout (object unused)
 165                 {
 166                         CloseSocket ();
 167                         Unbind ();
 168                 }
 169
 170                 public void BeginReadRequest ()
 171                 {
 172                         if (buffer == null)
 173                                 buffer = new byte [BufferSize];
 174                         try {
 175                                 if (reuses == 1)
 176                                         s_timeout = 15000;
 177                                 timer.Change (s_timeout, Timeout.Infinite);
 178                                 stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 179                         } catch {
 180                                 timer.Change (Timeout.Infinite, Timeout.Infinite);
 181                                 CloseSocket ();
 182                                 Unbind ();
 183                         }
 184                 }
 185
 186                 public RequestStream GetRequestStream (bool chunked, long contentlength)
 187                 {
 188                         if (i_stream == null) {
 189                                 byte [] buffer = ms.GetBuffer ();
 190                                 int length = (int) ms.Length;
 191                                 ms = null;
 192                                 if (chunked) {
 193                                         this.chunked = true;
 194                                         context.Response.SendChunked = true;
 195                                         i_stream = new ChunkedInputStream (context, stream, buffer, position, length - position);
 196                                 } else {
 197                                         i_stream = new RequestStream (stream, buffer, position, length - position, contentlength);
 198                                 }
 199                         }
 200                         return i_stream;
 201                 }
 202
 203                 public ResponseStream GetResponseStream ()
 204                 {
 205                         // TODO: can we get this stream before reading the input?
 206                         if (o_stream == null) {
 207                                 HttpListener listener = context.Listener;
 208
 209                                 if(listener == null)
 210                                         return new ResponseStream (stream, context.Response, true);
 211
 212                                 o_stream = new ResponseStream (stream, context.Response, listener.IgnoreWriteExceptions);
 213                         }
 214                         return o_stream;
 215                 }
 216
 217                 static void OnRead (IAsyncResult ares)
 218                 {
 219                         HttpConnection cnc = (HttpConnection) ares.AsyncState;
 220                         cnc.OnReadInternal (ares);
 221                 }
 222
 223                 void OnReadInternal (IAsyncResult ares)
 224                 {
 225                         timer.Change (Timeout.Infinite, Timeout.Infinite);
 226                         int nread = -1;
 227                         try {
 228                                 nread = stream.EndRead (ares);
 229                                 ms.Write (buffer, 0, nread);
 230                                 if (ms.Length > 32768) {
 231                                         SendError ("Bad request", 400);
 232                                         Close (true);
 233                                         return;
 234                                 }
 235                         } catch {
 236                                 if (ms != null && ms.Length > 0)
 237                                         SendError ();
 238                                 if (sock != null) {
 239                                         CloseSocket ();
 240                                         Unbind ();
 241                                 }
 242                                 return;
 243                         }
 244
 245                         if (nread == 0) {
 246                                 //if (ms.Length > 0)
 247                                 //      SendError (); // Why bother?
 248                                 CloseSocket ();
 249                                 Unbind ();
 250                                 return;
 251                         }
 252
 253                         if (ProcessInput (ms)) {
 254                                 if (!context.HaveError)
 255                                         context.Request.FinishInitialization ();
 256
 257                                 if (context.HaveError) {
 258                                         SendError ();
 259                                         Close (true);
 260                                         return;
 261                                 }
 262
 263                                 if (!epl.BindContext (context)) {
 264                                         SendError ("Invalid host", 400);
 265                                         Close (true);
 266                                         return;
 267                                 }
 268                                 HttpListener listener = context.Listener;
 269                                 if (last_listener != listener) {
 270                                         RemoveConnection ();
 271                                         listener.AddConnection (this);
 272                                         last_listener = listener;
 273                                 }
 274
 275                                 context_bound = true;
 276                                 listener.RegisterContext (context);
 277                                 return;
 278                         }
 279                         stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 280                 }
 281
 282                 void RemoveConnection ()
 283                 {
 284                         if (last_listener == null)
 285                                 epl.RemoveConnection (this);
 286                         else
 287                                 last_listener.RemoveConnection (this);
 288                 }
 289
 290                 enum InputState {
 291                         RequestLine,
 292                         Headers
 293                 }
 294
 295                 enum LineState {
 296                         None,
 297                         CR,
 298                         LF
 299                 }
 300
 301                 InputState input_state = InputState.RequestLine;
 302                 LineState line_state = LineState.None;
 303                 int position;
 304
 305                 // true -> done processing
 306                 // false -> need more input
 307                 bool ProcessInput (MemoryStream ms)
 308                 {
 309                         byte [] buffer = ms.GetBuffer ();
 310                         int len = (int) ms.Length;
 311                         int used = 0;
 312                         string line;
 313
 314                         while (true) {
 315                                 if (context.HaveError)
 316                                         return true;
 317
 318                                 if (position >= len)
 319                                         break;
 320
 321                                 try {
 322                                         line = ReadLine (buffer, position, len - position, ref used);
 323                                         position += used;
 324                                 } catch {
 325                                         context.ErrorMessage = "Bad request";
 326                                         context.ErrorStatus = 400;
 327                                         return true;
 328                                 }
 329
 330                                 if (line == null)
 331                                         break;
 332
 333                                 if (line == "") {
 334                                         if (input_state == InputState.RequestLine)
 335                                                 continue;
 336                                         current_line = null;
 337                                         ms = null;
 338                                         return true;
 339                                 }
 340
 341                                 if (input_state == InputState.RequestLine) {
 342                                         context.Request.SetRequestLine (line);
 343                                         input_state = InputState.Headers;
 344                                 } else {
 345                                         try {
 346                                                 context.Request.AddHeader (line);
 347                                         } catch (Exception e) {
 348                                                 context.ErrorMessage = e.Message;
 349                                                 context.ErrorStatus = 400;
 350                                                 return true;
 351                                         }
 352                                 }
 353                         }
 354
 355                         if (used == len) {
 356                                 ms.SetLength (0);
 357                                 position = 0;
 358                         }
 359                         return false;
 360                 }
 361
 362                 string ReadLine (byte [] buffer, int offset, int len, ref int used)
 363                 {
 364                         if (current_line == null)
 365                                 current_line = new StringBuilder (128);
 366                         int last = offset + len;
 367                         used = 0;
 368                         for (int i = offset; i < last && line_state != LineState.LF; i++) {
 369                                 used++;
 370                                 byte b = buffer [i];
 371                                 if (b == 13) {
 372                                         line_state = LineState.CR;
 373                                 } else if (b == 10) {
 374                                         line_state = LineState.LF;
 375                                 } else {
 376                                         current_line.Append ((char) b);
 377                                 }
 378                         }
 379
 380                         string result = null;
 381                         if (line_state == LineState.LF) {
 382                                 line_state = LineState.None;
 383                                 result = current_line.ToString ();
 384                                 current_line.Length = 0;
 385                         }
 386
 387                         return result;
 388                 }
 389
 390                 public void SendError (string msg, int status)
 391                 {
 392                         try {
 393                                 HttpListenerResponse response = context.Response;
 394                                 response.StatusCode = status;
 395                                 response.ContentType = "text/html";
 396                                 string description = HttpListenerResponseHelper.GetStatusDescription (status);
 397                                 string str;
 398                                 if (msg != null)
 399                                         str = String.Format ("<h1>{0} ({1})</h1>", description, msg);
 400                                 else
 401                                         str = String.Format ("<h1>{0}</h1>", description);
 402
 403                                 byte [] error = context.Response.ContentEncoding.GetBytes (str);
 404                                 response.Close (error, false);
 405                         } catch {
 406                                 // response was already closed
 407                         }
 408                 }
 409
 410                 public void SendError ()
 411                 {
 412                         SendError (context.ErrorMessage, context.ErrorStatus);
 413                 }
 414
 415                 void Unbind ()
 416                 {
 417                         if (context_bound) {
 418                                 epl.UnbindContext (context);
 419                                 context_bound = false;
 420                         }
 421                 }
 422
 423                 public void Close ()
 424                 {
 425                         Close (false);
 426                 }
 427
 428                 void CloseSocket ()
 429                 {
 430                         if (sock == null)
 431                                 return;
 432
 433                         try {
 434                                 sock.Close ();
 435                         } catch {
 436                         } finally {
 437                                 sock = null;
 438                         }
 439                         RemoveConnection ();
 440                 }
 441
 442                 internal void Close (bool force_close)
 443                 {
 444                         if (sock != null) {
 445                                 Stream st = GetResponseStream ();
 446                                 if (st != null)
 447                                         st.Close ();
 448
 449                                 o_stream = null;
 450                         }
 451
 452                         if (sock != null) {
 453                                 force_close |= !context.Request.KeepAlive;
 454                                 if (!force_close)
 455                                         force_close = (context.Response.Headers ["connection"] == "close");
 456                                 /*
 457                                 if (!force_close) {
 458 //                                      bool conn_close = (status_code == 400 || status_code == 408 || status_code == 411 ||
 459 //                                                      status_code == 413 || status_code == 414 || status_code == 500 ||
 460 //                                                      status_code == 503);
 461
 462                                         force_close |= (context.Request.ProtocolVersion <= HttpVersion.Version10);
 463                                 }
 464                                 */
 465
 466                                 if (!force_close && context.Request.FlushInput ()) {
 467                                         if (chunked && context.Response.ForceCloseChunked == false) {
 468                                                 // Don't close. Keep working.
 469                                                 reuses++;
 470                                                 Unbind ();
 471                                                 Init ();
 472                                                 BeginReadRequest ();
 473                                                 return;
 474                                         }
 475
 476                                         reuses++;
 477                                         Unbind ();
 478                                         Init ();
 479                                         BeginReadRequest ();
 480                                         return;
 481                                 }
 482
 483                                 Socket s = sock;
 484                                 sock = null;
 485                                 try {
 486                                         if (s != null)
 487                                                 s.Shutdown (SocketShutdown.Both);
 488                                 } catch {
 489                                 } finally {
 490                                         if (s != null)
 491                                                 s.Close ();
 492                                 }
 493                                 Unbind ();
 494                                 RemoveConnection ();
 495                                 return;
 496                         }
 497                 }
 498         }
 499 }
 500 #endif
 501