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 #if MONO_X509_ALIAS
  35 extern alias PrebuiltSystem;
  36 #endif
  37
  38 #if MONO_SECURITY_ALIAS
  39 using MSI = MonoSecurity::Mono.Security.Interface;
  40 #else
  41 using MSI = Mono.Security.Interface;
  42 #endif
  43 #if MONO_X509_ALIAS
  44 using XX509CertificateCollection = PrebuiltSystem::System.Security.Cryptography.X509Certificates.X509CertificateCollection;
  45 #else
  46 using XX509CertificateCollection = System.Security.Cryptography.X509Certificates.X509CertificateCollection;
  47 #endif
  48
  49 using System.IO;
  50 using System.Net.Sockets;
  51 using System.Text;
  52 using System.Threading;
  53 using System.Security.Authentication;
  54 using System.Security.Cryptography;
  55 using System.Security.Cryptography.X509Certificates;
  56 using Mono.Net.Security;
  57
  58 namespace System.Net {
  59         sealed class HttpConnection
  60         {
  61                 static AsyncCallback onread_cb = new AsyncCallback (OnRead);
  62                 const int BufferSize = 8192;
  63                 Socket sock;
  64                 Stream stream;
  65                 EndPointListener epl;
  66                 MemoryStream ms;
  67                 byte [] buffer;
  68                 HttpListenerContext context;
  69                 StringBuilder current_line;
  70                 ListenerPrefix prefix;
  71                 RequestStream i_stream;
  72                 ResponseStream o_stream;
  73                 bool chunked;
  74                 int reuses;
  75                 bool context_bound;
  76                 bool secure;
  77                 X509Certificate cert;
  78                 int s_timeout = 90000; // 90k ms for first request, 15k ms from then on
  79                 Timer timer;
  80                 IPEndPoint local_ep;
  81                 HttpListener last_listener;
  82                 int [] client_cert_errors;
  83                 X509Certificate2 client_cert;
  84                 IMonoSslStream ssl_stream;
  85
  86                 public HttpConnection (Socket sock, EndPointListener epl, bool secure, X509Certificate cert)
  87                 {
  88                         this.sock = sock;
  89                         this.epl = epl;
  90                         this.secure = secure;
  91                         this.cert = cert;
  92                         if (secure == false) {
  93                                 stream = new NetworkStream (sock, false);
  94                         } else {
  95                                 ssl_stream = epl.Listener.CreateSslStream (new NetworkStream (sock, false), false, (t, c, ch, e) => {
  96                                         if (c == null)
  97                                                 return true;
  98                                         var c2 = c as X509Certificate2;
  99                                         if (c2 == null)
 100                                                 c2 = new X509Certificate2 (c.GetRawCertData ());
 101                                         client_cert = c2;
 102                                         client_cert_errors = new int[] { (int)e };
 103                                         return true;
 104                                 });
 105                                 stream = ssl_stream.AuthenticatedStream;
 106                         }
 107                         timer = new Timer (OnTimeout, null, Timeout.Infinite, Timeout.Infinite);
 108                         Init ();
 109                 }
 110
 111                 internal int [] ClientCertificateErrors {
 112                         get { return client_cert_errors; }
 113                 }
 114
 115                 internal X509Certificate2 ClientCertificate {
 116                         get { return client_cert; }
 117                 }
 118
 119                 void Init ()
 120                 {
 121                         if (ssl_stream != null) {
 122                                 ssl_stream.AuthenticateAsServer (cert, true, (SslProtocols)ServicePointManager.SecurityProtocol, false);
 123                         }
 124
 125                         context_bound = false;
 126                         i_stream = null;
 127                         o_stream = null;
 128                         prefix = null;
 129                         chunked = false;
 130                         ms = new MemoryStream ();
 131                         position = 0;
 132                         input_state = InputState.RequestLine;
 133                         line_state = LineState.None;
 134                         context = new HttpListenerContext (this);
 135                 }
 136
 137                 public bool IsClosed {
 138                         get { return (sock == null); }
 139                 }
 140
 141                 public int Reuses {
 142                         get { return reuses; }
 143                 }
 144
 145                 public IPEndPoint LocalEndPoint {
 146                         get {
 147                                 if (local_ep != null)
 148                                         return local_ep;
 149
 150                                 local_ep = (IPEndPoint) sock.LocalEndPoint;
 151                                 return local_ep;
 152                         }
 153                 }
 154
 155                 public IPEndPoint RemoteEndPoint {
 156                         get { return (IPEndPoint) sock.RemoteEndPoint; }
 157                 }
 158
 159                 public bool IsSecure {
 160                         get { return secure; }
 161                 }
 162
 163                 public ListenerPrefix Prefix {
 164                         get { return prefix; }
 165                         set { prefix = value; }
 166                 }
 167
 168                 void OnTimeout (object unused)
 169                 {
 170                         CloseSocket ();
 171                         Unbind ();
 172                 }
 173
 174                 public void BeginReadRequest ()
 175                 {
 176                         if (buffer == null)
 177                                 buffer = new byte [BufferSize];
 178                         try {
 179                                 if (reuses == 1)
 180                                         s_timeout = 15000;
 181                                 timer.Change (s_timeout, Timeout.Infinite);
 182                                 stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 183                         } catch {
 184                                 timer.Change (Timeout.Infinite, Timeout.Infinite);
 185                                 CloseSocket ();
 186                                 Unbind ();
 187                         }
 188                 }
 189
 190                 public RequestStream GetRequestStream (bool chunked, long contentlength)
 191                 {
 192                         if (i_stream == null) {
 193                                 byte [] buffer = ms.GetBuffer ();
 194                                 int length = (int) ms.Length;
 195                                 ms = null;
 196                                 if (chunked) {
 197                                         this.chunked = true;
 198                                         context.Response.SendChunked = true;
 199                                         i_stream = new ChunkedInputStream (context, stream, buffer, position, length - position);
 200                                 } else {
 201                                         i_stream = new RequestStream (stream, buffer, position, length - position, contentlength);
 202                                 }
 203                         }
 204                         return i_stream;
 205                 }
 206
 207                 public ResponseStream GetResponseStream ()
 208                 {
 209                         // TODO: can we get this stream before reading the input?
 210                         if (o_stream == null) {
 211                                 HttpListener listener = context.Listener;
 212                                 bool ign = (listener == null) ? true : listener.IgnoreWriteExceptions;
 213                                 o_stream = new ResponseStream (stream, context.Response, ign);
 214                         }
 215                         return o_stream;
 216                 }
 217
 218                 static void OnRead (IAsyncResult ares)
 219                 {
 220                         HttpConnection cnc = (HttpConnection) ares.AsyncState;
 221                         cnc.OnReadInternal (ares);
 222                 }
 223
 224                 void OnReadInternal (IAsyncResult ares)
 225                 {
 226                         timer.Change (Timeout.Infinite, Timeout.Infinite);
 227                         int nread = -1;
 228                         try {
 229                                 nread = stream.EndRead (ares);
 230                                 ms.Write (buffer, 0, nread);
 231                                 if (ms.Length > 32768) {
 232                                         SendError ("Bad request", 400);
 233                                         Close (true);
 234                                         return;
 235                                 }
 236                         } catch {
 237                                 if (ms != null && ms.Length > 0)
 238                                         SendError ();
 239                                 if (sock != null) {
 240                                         CloseSocket ();
 241                                         Unbind ();
 242                                 }
 243                                 return;
 244                         }
 245
 246                         if (nread == 0) {
 247                                 //if (ms.Length > 0)
 248                                 //      SendError (); // Why bother?
 249                                 CloseSocket ();
 250                                 Unbind ();
 251                                 return;
 252                         }
 253
 254                         if (ProcessInput (ms)) {
 255                                 if (!context.HaveError)
 256                                         context.Request.FinishInitialization ();
 257
 258                                 if (context.HaveError) {
 259                                         SendError ();
 260                                         Close (true);
 261                                         return;
 262                                 }
 263
 264                                 if (!epl.BindContext (context)) {
 265                                         SendError ("Invalid host", 400);
 266                                         Close (true);
 267                                         return;
 268                                 }
 269                                 HttpListener listener = context.Listener;
 270                                 if (last_listener != listener) {
 271                                         RemoveConnection ();
 272                                         listener.AddConnection (this);
 273                                         last_listener = listener;
 274                                 }
 275
 276                                 context_bound = true;
 277                                 listener.RegisterContext (context);
 278                                 return;
 279                         }
 280                         stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 281                 }
 282
 283                 void RemoveConnection ()
 284                 {
 285                         if (last_listener == null)
 286                                 epl.RemoveConnection (this);
 287                         else
 288                                 last_listener.RemoveConnection (this);
 289                 }
 290
 291                 enum InputState {
 292                         RequestLine,
 293                         Headers
 294                 }
 295
 296                 enum LineState {
 297                         None,
 298                         CR,
 299                         LF
 300                 }
 301
 302                 InputState input_state = InputState.RequestLine;
 303                 LineState line_state = LineState.None;
 304                 int position;
 305
 306                 // true -> done processing
 307                 // false -> need more input
 308                 bool ProcessInput (MemoryStream ms)
 309                 {
 310                         byte [] buffer = ms.GetBuffer ();
 311                         int len = (int) ms.Length;
 312                         int used = 0;
 313                         string line;
 314
 315                         while (true) {
 316                                 if (context.HaveError)
 317                                         return true;
 318
 319                                 if (position >= len)
 320                                         break;
 321
 322                                 try {
 323                                         line = ReadLine (buffer, position, len - position, ref used);
 324                                         position += used;
 325                                 } catch {
 326                                         context.ErrorMessage = "Bad request";
 327                                         context.ErrorStatus = 400;
 328                                         return true;
 329                                 }
 330
 331                                 if (line == null)
 332                                         break;
 333
 334                                 if (line == "") {
 335                                         if (input_state == InputState.RequestLine)
 336                                                 continue;
 337                                         current_line = null;
 338                                         ms = null;
 339                                         return true;
 340                                 }
 341
 342                                 if (input_state == InputState.RequestLine) {
 343                                         context.Request.SetRequestLine (line);
 344                                         input_state = InputState.Headers;
 345                                 } else {
 346                                         try {
 347                                                 context.Request.AddHeader (line);
 348                                         } catch (Exception e) {
 349                                                 context.ErrorMessage = e.Message;
 350                                                 context.ErrorStatus = 400;
 351                                                 return true;
 352                                         }
 353                                 }
 354                         }
 355
 356                         if (used == len) {
 357                                 ms.SetLength (0);
 358                                 position = 0;
 359                         }
 360                         return false;
 361                 }
 362
 363                 string ReadLine (byte [] buffer, int offset, int len, ref int used)
 364                 {
 365                         if (current_line == null)
 366                                 current_line = new StringBuilder (128);
 367                         int last = offset + len;
 368                         used = 0;
 369                         for (int i = offset; i < last && line_state != LineState.LF; i++) {
 370                                 used++;
 371                                 byte b = buffer [i];
 372                                 if (b == 13) {
 373                                         line_state = LineState.CR;
 374                                 } else if (b == 10) {
 375                                         line_state = LineState.LF;
 376                                 } else {
 377                                         current_line.Append ((char) b);
 378                                 }
 379                         }
 380
 381                         string result = null;
 382                         if (line_state == LineState.LF) {
 383                                 line_state = LineState.None;
 384                                 result = current_line.ToString ();
 385                                 current_line.Length = 0;
 386                         }
 387
 388                         return result;
 389                 }
 390
 391                 public void SendError (string msg, int status)
 392                 {
 393                         try {
 394                                 HttpListenerResponse response = context.Response;
 395                                 response.StatusCode = status;
 396                                 response.ContentType = "text/html";
 397                                 string description = HttpListenerResponse.GetStatusDescription (status);
 398                                 string str;
 399                                 if (msg != null)
 400                                         str = String.Format ("<h1>{0} ({1})</h1>", description, msg);
 401                                 else
 402                                         str = String.Format ("<h1>{0}</h1>", description);
 403
 404                                 byte [] error = context.Response.ContentEncoding.GetBytes (str);
 405                                 response.Close (error, false);
 406                         } catch {
 407                                 // response was already closed
 408                         }
 409                 }
 410
 411                 public void SendError ()
 412                 {
 413                         SendError (context.ErrorMessage, context.ErrorStatus);
 414                 }
 415
 416                 void Unbind ()
 417                 {
 418                         if (context_bound) {
 419                                 epl.UnbindContext (context);
 420                                 context_bound = false;
 421                         }
 422                 }
 423
 424                 public void Close ()
 425                 {
 426                         Close (false);
 427                 }
 428
 429                 void CloseSocket ()
 430                 {
 431                         if (sock == null)
 432                                 return;
 433
 434                         try {
 435                                 sock.Close ();
 436                         } catch {
 437                         } finally {
 438                                 sock = null;
 439                         }
 440                         RemoveConnection ();
 441                 }
 442
 443                 internal void Close (bool force_close)
 444                 {
 445                         if (sock != null) {
 446                                 Stream st = GetResponseStream ();
 447                                 if (st != null)
 448                                         st.Close ();
 449
 450                                 o_stream = null;
 451                         }
 452
 453                         if (sock != null) {
 454                                 force_close |= !context.Request.KeepAlive;
 455                                 if (!force_close)
 456                                         force_close = (context.Response.Headers ["connection"] == "close");
 457                                 /*
 458                                 if (!force_close) {
 459 //                                      bool conn_close = (status_code == 400 || status_code == 408 || status_code == 411 ||
 460 //                                                      status_code == 413 || status_code == 414 || status_code == 500 ||
 461 //                                                      status_code == 503);
 462
 463                                         force_close |= (context.Request.ProtocolVersion <= HttpVersion.Version10);
 464                                 }
 465                                 */
 466
 467                                 if (!force_close && context.Request.FlushInput ()) {
 468                                         if (chunked && context.Response.ForceCloseChunked == false) {
 469                                                 // Don't close. Keep working.
 470                                                 reuses++;
 471                                                 Unbind ();
 472                                                 Init ();
 473                                                 BeginReadRequest ();
 474                                                 return;
 475                                         }
 476
 477                                         reuses++;
 478                                         Unbind ();
 479                                         Init ();
 480                                         BeginReadRequest ();
 481                                         return;
 482                                 }
 483
 484                                 Socket s = sock;
 485                                 sock = null;
 486                                 try {
 487                                         if (s != null)
 488                                                 s.Shutdown (SocketShutdown.Both);
 489                                 } catch {
 490                                 } finally {
 491                                         if (s != null)
 492                                                 s.Close ();
 493                                 }
 494                                 Unbind ();
 495                                 RemoveConnection ();
 496                                 return;
 497                         }
 498                 }
 499         }
 500 }
 501 #endif
 502