mcs/class/System/System.Net/WebConnection.cs

   1 //
   2 // System.Net.WebConnection
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) 2003 Ximian, Inc (http://www.ximian.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if SECURITY_DEP
  32
  33 #if MONOTOUCH || MONODROID
  34 using Mono.Security.Protocol.Tls;
  35 #else
  36 extern alias MonoSecurity;
  37 using MonoSecurity::Mono.Security.Protocol.Tls;
  38 #endif
  39
  40 #endif
  41
  42 using System.IO;
  43 using System.Collections;
  44 using System.Net.Sockets;
  45 using System.Reflection;
  46 using System.Security.Cryptography.X509Certificates;
  47 using System.Text;
  48 using System.Threading;
  49 using System.Diagnostics;
  50
  51 namespace System.Net
  52 {
  53         enum ReadState
  54         {
  55                 None,
  56                 Status,
  57                 Headers,
  58                 Content,
  59                 Aborted
  60         }
  61
  62         class WebConnection
  63         {
  64                 ServicePoint sPoint;
  65                 Stream nstream;
  66                 internal Socket socket;
  67                 object socketLock = new object ();
  68                 IWebConnectionState state;
  69                 WebExceptionStatus status;
  70                 WaitCallback initConn;
  71                 bool keepAlive;
  72                 byte [] buffer;
  73                 static AsyncCallback readDoneDelegate = new AsyncCallback (ReadDone);
  74                 EventHandler abortHandler;
  75                 AbortHelper abortHelper;
  76                 internal WebConnectionData Data;
  77                 bool chunkedRead;
  78                 ChunkStream chunkStream;
  79                 Queue queue;
  80                 bool reused;
  81                 int position;
  82                 HttpWebRequest priority_request;
  83                 NetworkCredential ntlm_credentials;
  84                 bool ntlm_authenticated;
  85                 bool unsafe_sharing;
  86
  87                 enum NtlmAuthState
  88                 {
  89                         None,
  90                         Challenge,
  91                         Response
  92                 }
  93                 NtlmAuthState connect_ntlm_auth_state;
  94                 HttpWebRequest connect_request;
  95
  96                 bool ssl;
  97                 bool certsAvailable;
  98                 Exception connect_exception;
  99                 static object classLock = new object ();
 100                 static Type sslStream;
 101 #if !MONOTOUCH && !MONODROID
 102                 static PropertyInfo piClient;
 103                 static PropertyInfo piServer;
 104                 static PropertyInfo piTrustFailure;
 105 #endif
 106
 107 #if MONOTOUCH
 108                 [System.Runtime.InteropServices.DllImport ("__Internal")]
 109                 static extern void monotouch_start_wwan (string uri);
 110 #endif
 111
 112                 internal ChunkStream ChunkStream {
 113                         get { return chunkStream; }
 114                 }
 115
 116                 public WebConnection (IWebConnectionState wcs, ServicePoint sPoint)
 117                 {
 118                         this.state = wcs;
 119                         this.sPoint = sPoint;
 120                         buffer = new byte [4096];
 121                         Data = new WebConnectionData ();
 122                         initConn = new WaitCallback (state => {
 123                                 try {
 124                                         InitConnection (state);
 125                                 } catch {}
 126                                 });
 127                         queue = wcs.Group.Queue;
 128                         abortHelper = new AbortHelper ();
 129                         abortHelper.Connection = this;
 130                         abortHandler = new EventHandler (abortHelper.Abort);
 131                 }
 132
 133                 class AbortHelper {
 134                         public WebConnection Connection;
 135
 136                         public void Abort (object sender, EventArgs args)
 137                         {
 138                                 WebConnection other = ((HttpWebRequest) sender).WebConnection;
 139                                 if (other == null)
 140                                         other = Connection;
 141                                 other.Abort (sender, args);
 142                         }
 143                 }
 144
 145                 bool CanReuse ()
 146                 {
 147                         // The real condition is !(socket.Poll (0, SelectMode.SelectRead) || socket.Available != 0)
 148                         // but if there's data pending to read (!) we won't reuse the socket.
 149                         return (socket.Poll (0, SelectMode.SelectRead) == false);
 150                 }
 151
 152                 void Connect (HttpWebRequest request)
 153                 {
 154                         lock (socketLock) {
 155                                 if (socket != null && socket.Connected && status == WebExceptionStatus.Success) {
 156                                         // Take the chunked stream to the expected state (State.None)
 157                                         if (CanReuse () && CompleteChunkedRead ()) {
 158                                                 reused = true;
 159                                                 return;
 160                                         }
 161                                 }
 162
 163                                 reused = false;
 164                                 if (socket != null) {
 165                                         socket.Close();
 166                                         socket = null;
 167                                 }
 168
 169                                 chunkStream = null;
 170                                 IPHostEntry hostEntry = sPoint.HostEntry;
 171
 172                                 if (hostEntry == null) {
 173 #if MONOTOUCH
 174                                         monotouch_start_wwan (sPoint.Address.ToString ());
 175                                         hostEntry = sPoint.HostEntry;
 176                                         if (hostEntry == null) {
 177 #endif
 178                                                 status = sPoint.UsesProxy ? WebExceptionStatus.ProxyNameResolutionFailure :
 179                                                                             WebExceptionStatus.NameResolutionFailure;
 180                                                 return;
 181 #if MONOTOUCH
 182                                         }
 183 #endif
 184                                 }
 185
 186                                 //WebConnectionData data = Data;
 187                                 foreach (IPAddress address in hostEntry.AddressList) {
 188                                         try {
 189                                                 socket = new Socket (address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
 190                                         } catch (Exception se) {
 191                                                 // The Socket ctor can throw if we run out of FD's
 192                                                 if (!request.Aborted)
 193                                                                 status = WebExceptionStatus.ConnectFailure;
 194                                                 connect_exception = se;
 195                                                 return;
 196                                         }
 197                                         IPEndPoint remote = new IPEndPoint (address, sPoint.Address.Port);
 198                                         socket.NoDelay = !sPoint.UseNagleAlgorithm;
 199                                         try {
 200                                                 sPoint.KeepAliveSetup (socket);
 201                                         } catch {
 202                                                 // Ignore. Not supported in all platforms.
 203                                         }
 204
 205                                         if (!sPoint.CallEndPointDelegate (socket, remote)) {
 206                                                 socket.Close ();
 207                                                 socket = null;
 208                                                 status = WebExceptionStatus.ConnectFailure;
 209                                         } else {
 210                                                 try {
 211                                                         if (request.Aborted)
 212                                                                 return;
 213                                                         socket.Connect (remote);
 214                                                         status = WebExceptionStatus.Success;
 215                                                         break;
 216                                                 } catch (ThreadAbortException) {
 217                                                         // program exiting...
 218                                                         Socket s = socket;
 219                                                         socket = null;
 220                                                         if (s != null)
 221                                                                 s.Close ();
 222                                                         return;
 223                                                 } catch (ObjectDisposedException) {
 224                                                         // socket closed from another thread
 225                                                         return;
 226                                                 } catch (Exception exc) {
 227                                                         Socket s = socket;
 228                                                         socket = null;
 229                                                         if (s != null)
 230                                                                 s.Close ();
 231                                                         if (!request.Aborted)
 232                                                                 status = WebExceptionStatus.ConnectFailure;
 233                                                         connect_exception = exc;
 234                                                 }
 235                                         }
 236                                 }
 237                         }
 238                 }
 239
 240                 static void EnsureSSLStreamAvailable ()
 241                 {
 242                         lock (classLock) {
 243                                 if (sslStream != null)
 244                                         return;
 245
 246 #if NET_2_1 && SECURITY_DEP
 247                                 sslStream = typeof (HttpsClientStream);
 248 #else
 249                                 // HttpsClientStream is an internal glue class in Mono.Security.dll
 250                                 sslStream = Type.GetType ("Mono.Security.Protocol.Tls.HttpsClientStream, " +
 251                                                         Consts.AssemblyMono_Security, false);
 252
 253                                 if (sslStream == null) {
 254                                         string msg = "Missing Mono.Security.dll assembly. " +
 255                                                         "Support for SSL/TLS is unavailable.";
 256
 257                                         throw new NotSupportedException (msg);
 258                                 }
 259 #endif
 260 #if !MONOTOUCH && !MONODROID
 261                                 piClient = sslStream.GetProperty ("SelectedClientCertificate");
 262                                 piServer = sslStream.GetProperty ("ServerCertificate");
 263                                 piTrustFailure = sslStream.GetProperty ("TrustFailure");
 264 #endif
 265                         }
 266                 }
 267
 268                 bool CreateTunnel (HttpWebRequest request, Uri connectUri,
 269                                    Stream stream, out byte[] buffer)
 270                 {
 271                         StringBuilder sb = new StringBuilder ();
 272                         sb.Append ("CONNECT ");
 273                         sb.Append (request.Address.Host);
 274                         sb.Append (':');
 275                         sb.Append (request.Address.Port);
 276                         sb.Append (" HTTP/");
 277                         if (request.ServicePoint.ProtocolVersion == HttpVersion.Version11)
 278                                 sb.Append ("1.1");
 279                         else
 280                                 sb.Append ("1.0");
 281
 282                         sb.Append ("\r\nHost: ");
 283                         sb.Append (request.Address.Authority);
 284
 285                         bool ntlm = false;
 286                         var challenge = Data.Challenge;
 287                         Data.Challenge = null;
 288                         var auth_header = request.Headers ["Proxy-Authorization"];
 289                         bool have_auth = auth_header != null;
 290                         if (have_auth) {
 291                                 sb.Append ("\r\nProxy-Authorization: ");
 292                                 sb.Append (auth_header);
 293                                 ntlm = auth_header.ToUpper ().Contains ("NTLM");
 294                         } else if (challenge != null && Data.StatusCode == 407) {
 295                                 ICredentials creds = request.Proxy.Credentials;
 296                                 have_auth = true;
 297
 298                                 if (connect_request == null) {
 299                                         // create a CONNECT request to use with Authenticate
 300                                         connect_request = (HttpWebRequest)WebRequest.Create (
 301                                                 connectUri.Scheme + "://" + connectUri.Host + ":" + connectUri.Port + "/");
 302                                         connect_request.Method = "CONNECT";
 303                                         connect_request.Credentials = creds;
 304                                 }
 305
 306                                 for (int i = 0; i < challenge.Length; i++) {
 307                                         var auth = AuthenticationManager.Authenticate (challenge [i], connect_request, creds);
 308                                         if (auth == null)
 309                                                 continue;
 310                                         ntlm = (auth.Module.AuthenticationType == "NTLM");
 311                                         sb.Append ("\r\nProxy-Authorization: ");
 312                                         sb.Append (auth.Message);
 313                                         break;
 314                                 }
 315                         }
 316
 317                         if (ntlm) {
 318                                 sb.Append ("\r\nProxy-Connection: keep-alive");
 319                                 connect_ntlm_auth_state++;
 320                         }
 321
 322                         sb.Append ("\r\n\r\n");
 323
 324                         Data.StatusCode = 0;
 325                         byte [] connectBytes = Encoding.Default.GetBytes (sb.ToString ());
 326                         stream.Write (connectBytes, 0, connectBytes.Length);
 327
 328                         int status;
 329                         WebHeaderCollection result = ReadHeaders (stream, out buffer, out status);
 330                         if ((!have_auth || connect_ntlm_auth_state == NtlmAuthState.Challenge) &&
 331                             result != null && status == 407) { // Needs proxy auth
 332                                 var connectionHeader = result ["Connection"];
 333                                 if (socket != null && !string.IsNullOrEmpty (connectionHeader) &&
 334                                     connectionHeader.ToLower() == "close") {
 335                                         // The server is requesting that this connection be closed
 336                                         socket.Close();
 337                                         socket = null;
 338                                 }
 339
 340                                 Data.StatusCode = status;
 341                                 Data.Challenge = result.GetValues_internal ("Proxy-Authenticate", false);
 342                                 return false;
 343                         } else if (status != 200) {
 344                                 string msg = String.Format ("The remote server returned a {0} status code.", status);
 345                                 HandleError (WebExceptionStatus.SecureChannelFailure, null, msg);
 346                                 return false;
 347                         }
 348
 349                         return (result != null);
 350                 }
 351
 352                 WebHeaderCollection ReadHeaders (Stream stream, out byte [] retBuffer, out int status)
 353                 {
 354                         retBuffer = null;
 355                         status = 200;
 356
 357                         byte [] buffer = new byte [1024];
 358                         MemoryStream ms = new MemoryStream ();
 359
 360                         while (true) {
 361                                 int n = stream.Read (buffer, 0, 1024);
 362                                 if (n == 0) {
 363                                         HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadHeaders");
 364                                         return null;
 365                                 }
 366
 367                                 ms.Write (buffer, 0, n);
 368                                 int start = 0;
 369                                 string str = null;
 370                                 bool gotStatus = false;
 371                                 WebHeaderCollection headers = new WebHeaderCollection ();
 372                                 while (ReadLine (ms.GetBuffer (), ref start, (int) ms.Length, ref str)) {
 373                                         if (str == null) {
 374                                                 int contentLen = 0;
 375                                                 try     {
 376                                                         contentLen = int.Parse(headers["Content-Length"]);
 377                                                 }
 378                                                 catch {
 379                                                         contentLen = 0;
 380                                                 }
 381
 382                                                 if (ms.Length - start - contentLen > 0) {
 383                                                         // we've read more data than the response header and conents,
 384                                                         // give back extra data to the caller
 385                                                         retBuffer = new byte[ms.Length - start - contentLen];
 386                                                         Buffer.BlockCopy(ms.GetBuffer(), start + contentLen, retBuffer, 0, retBuffer.Length);
 387                                                 }
 388                                                 else {
 389                                                         // haven't read in some or all of the contents for the response, do so now
 390                                                         FlushContents(stream, contentLen - (int)(ms.Length - start));
 391                                                 }
 392
 393                                                 return headers;
 394                                         }
 395
 396                                         if (gotStatus) {
 397                                                 headers.Add (str);
 398                                                 continue;
 399                                         }
 400
 401                                         string[] parts = str.Split (' ');
 402                                         if (parts.Length < 2) {
 403                                                 HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadHeaders2");
 404                                                 return null;
 405                                         }
 406
 407                                         if (String.Compare (parts [0], "HTTP/1.1", true) == 0)
 408                                                 Data.ProxyVersion = HttpVersion.Version11;
 409                                         else if (String.Compare (parts [0], "HTTP/1.0", true) == 0)
 410                                                 Data.ProxyVersion = HttpVersion.Version10;
 411                                         else {
 412                                                 HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadHeaders2");
 413                                                 return null;
 414                                         }
 415
 416                                         status = (int)UInt32.Parse (parts [1]);
 417                                         gotStatus = true;
 418                                 }
 419                         }
 420                 }
 421
 422                 void FlushContents(Stream stream, int contentLength)
 423                 {
 424                         while (contentLength > 0) {
 425                                 byte[] contentBuffer = new byte[contentLength];
 426                                 int bytesRead = stream.Read(contentBuffer, 0, contentLength);
 427                                 if (bytesRead > 0) {
 428                                         contentLength -= bytesRead;
 429                                 }
 430                                 else {
 431                                         break;
 432                                 }
 433                         }
 434                 }
 435
 436                 bool CreateStream (HttpWebRequest request)
 437                 {
 438                         try {
 439                                 NetworkStream serverStream = new NetworkStream (socket, false);
 440
 441                                 if (request.Address.Scheme == Uri.UriSchemeHttps) {
 442                                         ssl = true;
 443                                         EnsureSSLStreamAvailable ();
 444                                         if (!reused || nstream == null || nstream.GetType () != sslStream) {
 445                                                 byte [] buffer = null;
 446                                                 if (sPoint.UseConnect) {
 447                                                         bool ok = CreateTunnel (request, sPoint.Address, serverStream, out buffer);
 448                                                         if (!ok)
 449                                                                 return false;
 450                                                 }
 451 #if SECURITY_DEP
 452 #if MONOTOUCH || MONODROID
 453                                                 nstream = new HttpsClientStream (serverStream, request.ClientCertificates, request, buffer);
 454 #else
 455                                                 object[] args = new object [4] { serverStream,
 456                                                         request.ClientCertificates,
 457                                                         request, buffer};
 458                                                 nstream = (Stream) Activator.CreateInstance (sslStream, args);
 459 #endif
 460                                                 SslClientStream scs = (SslClientStream) nstream;
 461                                                 var helper = new ServicePointManager.ChainValidationHelper (request, request.Address.Host);
 462                                                 scs.ServerCertValidation2 += new CertificateValidationCallback2 (helper.ValidateChain);
 463 #endif
 464                                                 certsAvailable = false;
 465                                         }
 466                                         // we also need to set ServicePoint.Certificate
 467                                         // and ServicePoint.ClientCertificate but this can
 468                                         // only be done later (after handshake - which is
 469                                         // done only after a read operation).
 470                                 } else {
 471                                         ssl = false;
 472                                         nstream = serverStream;
 473                                 }
 474                         } catch (Exception) {
 475                                 if (!request.Aborted)
 476                                         status = WebExceptionStatus.ConnectFailure;
 477                                 return false;
 478                         }
 479
 480                         return true;
 481                 }
 482
 483                 void HandleError (WebExceptionStatus st, Exception e, string where)
 484                 {
 485                         status = st;
 486                         lock (this) {
 487                                 if (st == WebExceptionStatus.RequestCanceled)
 488                                         Data = new WebConnectionData ();
 489                         }
 490
 491                         if (e == null) { // At least we now where it comes from
 492                                 try {
 493 #if TARGET_JVM
 494                                         throw new Exception ();
 495 #else
 496                                         throw new Exception (new System.Diagnostics.StackTrace ().ToString ());
 497 #endif
 498                                 } catch (Exception e2) {
 499                                         e = e2;
 500                                 }
 501                         }
 502
 503                         HttpWebRequest req = null;
 504                         if (Data != null && Data.request != null)
 505                                 req = Data.request;
 506
 507                         Close (true);
 508                         if (req != null) {
 509                                 req.FinishedReading = true;
 510                                 req.SetResponseError (st, e, where);
 511                         }
 512                 }
 513
 514                 static void ReadDone (IAsyncResult result)
 515                 {
 516                         WebConnection cnc = (WebConnection)result.AsyncState;
 517                         WebConnectionData data = cnc.Data;
 518                         Stream ns = cnc.nstream;
 519                         if (ns == null) {
 520                                 cnc.Close (true);
 521                                 return;
 522                         }
 523
 524                         int nread = -1;
 525                         try {
 526                                 nread = ns.EndRead (result);
 527                         } catch (ObjectDisposedException) {
 528                                 return;
 529                         } catch (Exception e) {
 530                                 if (e.InnerException is ObjectDisposedException)
 531                                         return;
 532
 533                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone1");
 534                                 return;
 535                         }
 536
 537                         if (nread == 0) {
 538                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, null, "ReadDone2");
 539                                 return;
 540                         }
 541
 542                         if (nread < 0) {
 543                                 cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadDone3");
 544                                 return;
 545                         }
 546
 547                         int pos = -1;
 548                         nread += cnc.position;
 549                         if (data.ReadState == ReadState.None) {
 550                                 Exception exc = null;
 551                                 try {
 552                                         pos = GetResponse (data, cnc.sPoint, cnc.buffer, nread);
 553                                 } catch (Exception e) {
 554                                         exc = e;
 555                                 }
 556
 557                                 if (exc != null || pos == -1) {
 558                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, exc, "ReadDone4");
 559                                         return;
 560                                 }
 561                         }
 562
 563                         if (data.ReadState == ReadState.Aborted) {
 564                                 cnc.HandleError (WebExceptionStatus.RequestCanceled, null, "ReadDone");
 565                                 return;
 566                         }
 567
 568                         if (data.ReadState != ReadState.Content) {
 569                                 int est = nread * 2;
 570                                 int max = (est < cnc.buffer.Length) ? cnc.buffer.Length : est;
 571                                 byte [] newBuffer = new byte [max];
 572                                 Buffer.BlockCopy (cnc.buffer, 0, newBuffer, 0, nread);
 573                                 cnc.buffer = newBuffer;
 574                                 cnc.position = nread;
 575                                 data.ReadState = ReadState.None;
 576                                 InitRead (cnc);
 577                                 return;
 578                         }
 579
 580                         cnc.position = 0;
 581
 582                         WebConnectionStream stream = new WebConnectionStream (cnc, data);
 583                         bool expect_content = ExpectContent (data.StatusCode, data.request.Method);
 584                         string tencoding = null;
 585                         if (expect_content)
 586                                 tencoding = data.Headers ["Transfer-Encoding"];
 587
 588                         cnc.chunkedRead = (tencoding != null && tencoding.IndexOf ("chunked", StringComparison.OrdinalIgnoreCase) != -1);
 589                         if (!cnc.chunkedRead) {
 590                                 stream.ReadBuffer = cnc.buffer;
 591                                 stream.ReadBufferOffset = pos;
 592                                 stream.ReadBufferSize = nread;
 593                                 try {
 594                                         stream.CheckResponseInBuffer ();
 595                                 } catch (Exception e) {
 596                                         cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone7");
 597                                 }
 598                         } else if (cnc.chunkStream == null) {
 599                                 try {
 600                                         cnc.chunkStream = new ChunkStream (cnc.buffer, pos, nread, data.Headers);
 601                                 } catch (Exception e) {
 602                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone5");
 603                                         return;
 604                                 }
 605                         } else {
 606                                 cnc.chunkStream.ResetBuffer ();
 607                                 try {
 608                                         cnc.chunkStream.Write (cnc.buffer, pos, nread);
 609                                 } catch (Exception e) {
 610                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone6");
 611                                         return;
 612                                 }
 613                         }
 614
 615                         data.stream = stream;
 616
 617                         if (!expect_content)
 618                                 stream.ForceCompletion ();
 619
 620                         data.request.SetResponseData (data);
 621                 }
 622
 623                 static bool ExpectContent (int statusCode, string method)
 624                 {
 625                         if (method == "HEAD")
 626                                 return false;
 627                         return (statusCode >= 200 && statusCode != 204 && statusCode != 304);
 628                 }
 629
 630                 internal void GetCertificates (Stream stream)
 631                 {
 632                         // here the SSL negotiation have been done
 633 #if SECURITY_DEP && (MONOTOUCH || MONODROID)
 634                         HttpsClientStream s = (stream as HttpsClientStream);
 635                         X509Certificate client = s.SelectedClientCertificate;
 636                         X509Certificate server = s.ServerCertificate;
 637 #else
 638                         X509Certificate client = (X509Certificate) piClient.GetValue (stream, null);
 639                         X509Certificate server = (X509Certificate) piServer.GetValue (stream, null);
 640 #endif
 641                         sPoint.SetCertificates (client, server);
 642                         certsAvailable = (server != null);
 643                 }
 644
 645                 internal static void InitRead (object state)
 646                 {
 647                         WebConnection cnc = (WebConnection) state;
 648                         Stream ns = cnc.nstream;
 649
 650                         try {
 651                                 int size = cnc.buffer.Length - cnc.position;
 652                                 ns.BeginRead (cnc.buffer, cnc.position, size, readDoneDelegate, cnc);
 653                         } catch (Exception e) {
 654                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "InitRead");
 655                         }
 656                 }
 657
 658                 static int GetResponse (WebConnectionData data, ServicePoint sPoint,
 659                                         byte [] buffer, int max)
 660                 {
 661                         int pos = 0;
 662                         string line = null;
 663                         bool lineok = false;
 664                         bool isContinue = false;
 665                         bool emptyFirstLine = false;
 666                         do {
 667                                 if (data.ReadState == ReadState.Aborted)
 668                                         return -1;
 669
 670                                 if (data.ReadState == ReadState.None) {
 671                                         lineok = ReadLine (buffer, ref pos, max, ref line);
 672                                         if (!lineok)
 673                                                 return 0;
 674
 675                                         if (line == null) {
 676                                                 emptyFirstLine = true;
 677                                                 continue;
 678                                         }
 679                                         emptyFirstLine = false;
 680                                         data.ReadState = ReadState.Status;
 681
 682                                         string [] parts = line.Split (' ');
 683                                         if (parts.Length < 2)
 684                                                 return -1;
 685
 686                                         if (String.Compare (parts [0], "HTTP/1.1", true) == 0) {
 687                                                 data.Version = HttpVersion.Version11;
 688                                                 sPoint.SetVersion (HttpVersion.Version11);
 689                                         } else {
 690                                                 data.Version = HttpVersion.Version10;
 691                                                 sPoint.SetVersion (HttpVersion.Version10);
 692                                         }
 693
 694                                         data.StatusCode = (int) UInt32.Parse (parts [1]);
 695                                         if (parts.Length >= 3)
 696                                                 data.StatusDescription = String.Join (" ", parts, 2, parts.Length - 2);
 697                                         else
 698                                                 data.StatusDescription = "";
 699
 700                                         if (pos >= max)
 701                                                 return pos;
 702                                 }
 703
 704                                 emptyFirstLine = false;
 705                                 if (data.ReadState == ReadState.Status) {
 706                                         data.ReadState = ReadState.Headers;
 707                                         data.Headers = new WebHeaderCollection ();
 708                                         ArrayList headers = new ArrayList ();
 709                                         bool finished = false;
 710                                         while (!finished) {
 711                                                 if (ReadLine (buffer, ref pos, max, ref line) == false)
 712                                                         break;
 713
 714                                                 if (line == null) {
 715                                                         // Empty line: end of headers
 716                                                         finished = true;
 717                                                         continue;
 718                                                 }
 719
 720                                                 if (line.Length > 0 && (line [0] == ' ' || line [0] == '\t')) {
 721                                                         int count = headers.Count - 1;
 722                                                         if (count < 0)
 723                                                                 break;
 724
 725                                                         string prev = (string) headers [count] + line;
 726                                                         headers [count] = prev;
 727                                                 } else {
 728                                                         headers.Add (line);
 729                                                 }
 730                                         }
 731
 732                                         if (!finished)
 733                                                 return 0;
 734
 735                                         foreach (string s in headers)
 736                                                 data.Headers.SetInternal (s);
 737
 738                                         if (data.StatusCode == (int) HttpStatusCode.Continue) {
 739                                                 sPoint.SendContinue = true;
 740                                                 if (pos >= max)
 741                                                         return pos;
 742
 743                                                 if (data.request.ExpectContinue) {
 744                                                         data.request.DoContinueDelegate (data.StatusCode, data.Headers);
 745                                                         // Prevent double calls when getting the
 746                                                         // headers in several packets.
 747                                                         data.request.ExpectContinue = false;
 748                                                 }
 749
 750                                                 data.ReadState = ReadState.None;
 751                                                 isContinue = true;
 752                                         }
 753                                         else {
 754                                                 data.ReadState = ReadState.Content;
 755                                                 return pos;
 756                                         }
 757                                 }
 758                         } while (emptyFirstLine || isContinue);
 759
 760                         return -1;
 761                 }
 762
 763                 void InitConnection (object state)
 764                 {
 765                         HttpWebRequest request = (HttpWebRequest) state;
 766                         request.WebConnection = this;
 767                         if (request.ReuseConnection)
 768                                 request.StoredConnection = this;
 769
 770                         if (request.Aborted)
 771                                 return;
 772
 773                         keepAlive = request.KeepAlive;
 774                         Data = new WebConnectionData (request);
 775                 retry:
 776                         Connect (request);
 777                         if (request.Aborted)
 778                                 return;
 779
 780                         if (status != WebExceptionStatus.Success) {
 781                                 if (!request.Aborted) {
 782                                         request.SetWriteStreamError (status, connect_exception);
 783                                         Close (true);
 784                                 }
 785                                 return;
 786                         }
 787
 788                         if (!CreateStream (request)) {
 789                                 if (request.Aborted)
 790                                         return;
 791
 792                                 WebExceptionStatus st = status;
 793                                 if (Data.Challenge != null)
 794                                         goto retry;
 795
 796                                 Exception cnc_exc = connect_exception;
 797                                 connect_exception = null;
 798                                 request.SetWriteStreamError (st, cnc_exc);
 799                                 Close (true);
 800                                 return;
 801                         }
 802
 803                         request.SetWriteStream (new WebConnectionStream (this, request));
 804                 }
 805
 806 #if MONOTOUCH
 807                 static bool warned_about_queue = false;
 808 #endif
 809
 810                 internal EventHandler SendRequest (HttpWebRequest request)
 811                 {
 812                         if (request.Aborted)
 813                                 return null;
 814
 815                         lock (this) {
 816                                 if (state.TrySetBusy ()) {
 817                                         status = WebExceptionStatus.Success;
 818                                         ThreadPool.QueueUserWorkItem (initConn, request);
 819                                 } else {
 820                                         lock (queue) {
 821 #if MONOTOUCH
 822                                                 if (!warned_about_queue) {
 823                                                         warned_about_queue = true;
 824                                                         Console.WriteLine ("WARNING: An HttpWebRequest was added to the ConnectionGroup queue because the connection limit was reached.");
 825                                                 }
 826 #endif
 827                                                 queue.Enqueue (request);
 828                                         }
 829                                 }
 830                         }
 831
 832                         return abortHandler;
 833                 }
 834
 835                 void SendNext ()
 836                 {
 837                         lock (queue) {
 838                                 if (queue.Count > 0) {
 839                                         SendRequest ((HttpWebRequest) queue.Dequeue ());
 840                                 }
 841                         }
 842                 }
 843
 844                 internal void NextRead ()
 845                 {
 846                         lock (this) {
 847                                 if (Data.request != null)
 848                                         Data.request.FinishedReading = true;
 849                                 string header = (sPoint.UsesProxy) ? "Proxy-Connection" : "Connection";
 850                                 string cncHeader = (Data.Headers != null) ? Data.Headers [header] : null;
 851                                 bool keepAlive = (Data.Version == HttpVersion.Version11 && this.keepAlive);
 852                                 if (Data.ProxyVersion != null && Data.ProxyVersion != HttpVersion.Version11)
 853                                         keepAlive = false;
 854                                 if (cncHeader != null) {
 855                                         cncHeader = cncHeader.ToLower ();
 856                                         keepAlive = (this.keepAlive && cncHeader.IndexOf ("keep-alive", StringComparison.Ordinal) != -1);
 857                                 }
 858
 859                                 if ((socket != null && !socket.Connected) ||
 860                                    (!keepAlive || (cncHeader != null && cncHeader.IndexOf ("close", StringComparison.Ordinal) != -1))) {
 861                                         Close (false);
 862                                 }
 863
 864                                 state.SetIdle ();
 865                                 if (priority_request != null) {
 866                                         SendRequest (priority_request);
 867                                         priority_request = null;
 868                                 } else {
 869                                         SendNext ();
 870                                 }
 871                         }
 872                 }
 873
 874                 static bool ReadLine (byte [] buffer, ref int start, int max, ref string output)
 875                 {
 876                         bool foundCR = false;
 877                         StringBuilder text = new StringBuilder ();
 878
 879                         int c = 0;
 880                         while (start < max) {
 881                                 c = (int) buffer [start++];
 882
 883                                 if (c == '\n') {                        // newline
 884                                         if ((text.Length > 0) && (text [text.Length - 1] == '\r'))
 885                                                 text.Length--;
 886
 887                                         foundCR = false;
 888                                         break;
 889                                 } else if (foundCR) {
 890                                         text.Length--;
 891                                         break;
 892                                 }
 893
 894                                 if (c == '\r')
 895                                         foundCR = true;
 896
 897
 898                                 text.Append ((char) c);
 899                         }
 900
 901                         if (c != '\n' && c != '\r')
 902                                 return false;
 903
 904                         if (text.Length == 0) {
 905                                 output = null;
 906                                 return (c == '\n' || c == '\r');
 907                         }
 908
 909                         if (foundCR)
 910                                 text.Length--;
 911
 912                         output = text.ToString ();
 913                         return true;
 914                 }
 915
 916
 917                 internal IAsyncResult BeginRead (HttpWebRequest request, byte [] buffer, int offset, int size, AsyncCallback cb, object state)
 918                 {
 919                         Stream s = null;
 920                         lock (this) {
 921                                 if (Data.request != request)
 922                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
 923                                 if (nstream == null)
 924                                         return null;
 925                                 s = nstream;
 926                         }
 927
 928                         IAsyncResult result = null;
 929                         if (!chunkedRead || (!chunkStream.DataAvailable && chunkStream.WantMore)) {
 930                                 try {
 931                                         result = s.BeginRead (buffer, offset, size, cb, state);
 932                                         cb = null;
 933                                 } catch (Exception) {
 934                                         HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked BeginRead");
 935                                         throw;
 936                                 }
 937                         }
 938
 939                         if (chunkedRead) {
 940                                 WebAsyncResult wr = new WebAsyncResult (cb, state, buffer, offset, size);
 941                                 wr.InnerAsyncResult = result;
 942                                 if (result == null) {
 943                                         // Will be completed from the data in ChunkStream
 944                                         wr.SetCompleted (true, (Exception) null);
 945                                         wr.DoCallback ();
 946                                 }
 947                                 return wr;
 948                         }
 949
 950                         return result;
 951                 }
 952
 953                 internal int EndRead (HttpWebRequest request, IAsyncResult result)
 954                 {
 955                         Stream s = null;
 956                         lock (this) {
 957                                 if (Data.request != request)
 958                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
 959                                 if (nstream == null)
 960                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
 961                                 s = nstream;
 962                         }
 963
 964                         int nbytes = 0;
 965                         bool done = false;
 966                         WebAsyncResult wr = null;
 967                         IAsyncResult nsAsync = ((WebAsyncResult) result).InnerAsyncResult;
 968                         if (chunkedRead && (nsAsync is WebAsyncResult)) {
 969                                 wr = (WebAsyncResult) nsAsync;
 970                                 IAsyncResult inner = wr.InnerAsyncResult;
 971                                 if (inner != null && !(inner is WebAsyncResult)) {
 972                                         nbytes = s.EndRead (inner);
 973                                         done = nbytes == 0;
 974                                 }
 975                         } else if (!(nsAsync is WebAsyncResult)) {
 976                                 nbytes = s.EndRead (nsAsync);
 977                                 wr = (WebAsyncResult) result;
 978                                 done = nbytes == 0;
 979                         }
 980
 981                         if (chunkedRead) {
 982                                 try {
 983                                         chunkStream.WriteAndReadBack (wr.Buffer, wr.Offset, wr.Size, ref nbytes);
 984                                         if (!done && nbytes == 0 && chunkStream.WantMore)
 985                                                 nbytes = EnsureRead (wr.Buffer, wr.Offset, wr.Size);
 986                                 } catch (Exception e) {
 987                                         if (e is WebException)
 988                                                 throw e;
 989
 990                                         throw new WebException ("Invalid chunked data.", e,
 991                                                                 WebExceptionStatus.ServerProtocolViolation, null);
 992                                 }
 993
 994                                 if ((done || nbytes == 0) && chunkStream.ChunkLeft != 0) {
 995                                         HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked EndRead");
 996                                         throw new WebException ("Read error", null, WebExceptionStatus.ReceiveFailure, null);
 997                                 }
 998                         }
 999
1000                         return (nbytes != 0) ? nbytes : -1;
1001                 }
1002
1003                 // To be called on chunkedRead when we can read no data from the ChunkStream yet
1004                 int EnsureRead (byte [] buffer, int offset, int size)
1005                 {
1006                         byte [] morebytes = null;
1007                         int nbytes = 0;
1008                         while (nbytes == 0 && chunkStream.WantMore) {
1009                                 int localsize = chunkStream.ChunkLeft;
1010                                 if (localsize <= 0) // not read chunk size yet
1011                                         localsize = 1024;
1012                                 else if (localsize > 16384)
1013                                         localsize = 16384;
1014
1015                                 if (morebytes == null || morebytes.Length < localsize)
1016                                         morebytes = new byte [localsize];
1017
1018                                 int nread = nstream.Read (morebytes, 0, localsize);
1019                                 if (nread <= 0)
1020                                         return 0; // Error
1021
1022                                 chunkStream.Write (morebytes, 0, nread);
1023                                 nbytes += chunkStream.Read (buffer, offset + nbytes, size - nbytes);
1024                         }
1025
1026                         return nbytes;
1027                 }
1028
1029                 bool CompleteChunkedRead()
1030                 {
1031                         if (!chunkedRead || chunkStream == null)
1032                                 return true;
1033
1034                         while (chunkStream.WantMore) {
1035                                 int nbytes = nstream.Read (buffer, 0, buffer.Length);
1036                                 if (nbytes <= 0)
1037                                         return false; // Socket was disconnected
1038
1039                                 chunkStream.Write (buffer, 0, nbytes);
1040                         }
1041
1042                         return true;
1043                 }
1044
1045                 internal IAsyncResult BeginWrite (HttpWebRequest request, byte [] buffer, int offset, int size, AsyncCallback cb, object state)
1046                 {
1047                         Stream s = null;
1048                         lock (this) {
1049                                 if (Data.request != request)
1050                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1051                                 if (nstream == null)
1052                                         return null;
1053                                 s = nstream;
1054                         }
1055
1056                         IAsyncResult result = null;
1057                         try {
1058                                 result = s.BeginWrite (buffer, offset, size, cb, state);
1059                         } catch (Exception) {
1060                                 status = WebExceptionStatus.SendFailure;
1061                                 throw;
1062                         }
1063
1064                         return result;
1065                 }
1066
1067                 internal bool EndWrite (HttpWebRequest request, bool throwOnError, IAsyncResult result)
1068                 {
1069                         if (request.FinishedReading)
1070                                 return true;
1071
1072                         Stream s = null;
1073                         lock (this) {
1074                                 if (Data.request != request)
1075                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1076                                 if (nstream == null)
1077                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1078                                 s = nstream;
1079                         }
1080
1081                         try {
1082                                 s.EndWrite (result);
1083                                 return true;
1084                         } catch (Exception exc) {
1085                                 status = WebExceptionStatus.SendFailure;
1086                                 if (throwOnError && exc.InnerException != null)
1087                                         throw exc.InnerException;
1088                                 return false;
1089                         }
1090                 }
1091
1092                 internal int Read (HttpWebRequest request, byte [] buffer, int offset, int size)
1093                 {
1094                         Stream s = null;
1095                         lock (this) {
1096                                 if (Data.request != request)
1097                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1098                                 if (nstream == null)
1099                                         return 0;
1100                                 s = nstream;
1101                         }
1102
1103                         int result = 0;
1104                         try {
1105                                 bool done = false;
1106                                 if (!chunkedRead) {
1107                                         result = s.Read (buffer, offset, size);
1108                                         done = (result == 0);
1109                                 }
1110
1111                                 if (chunkedRead) {
1112                                         try {
1113                                                 chunkStream.WriteAndReadBack (buffer, offset, size, ref result);
1114                                                 if (!done && result == 0 && chunkStream.WantMore)
1115                                                         result = EnsureRead (buffer, offset, size);
1116                                         } catch (Exception e) {
1117                                                 HandleError (WebExceptionStatus.ReceiveFailure, e, "chunked Read1");
1118                                                 throw;
1119                                         }
1120
1121                                         if ((done || result == 0) && chunkStream.WantMore) {
1122                                                 HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked Read2");
1123                                                 throw new WebException ("Read error", null, WebExceptionStatus.ReceiveFailure, null);
1124                                         }
1125                                 }
1126                         } catch (Exception e) {
1127                                 HandleError (WebExceptionStatus.ReceiveFailure, e, "Read");
1128                         }
1129
1130                         return result;
1131                 }
1132
1133                 internal bool Write (HttpWebRequest request, byte [] buffer, int offset, int size, ref string err_msg)
1134                 {
1135                         err_msg = null;
1136                         Stream s = null;
1137                         lock (this) {
1138                                 if (Data.request != request)
1139                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1140                                 s = nstream;
1141                                 if (s == null)
1142                                         return false;
1143                         }
1144
1145                         try {
1146                                 s.Write (buffer, offset, size);
1147                                 // here SSL handshake should have been done
1148                                 if (ssl && !certsAvailable)
1149                                         GetCertificates (s);
1150                         } catch (Exception e) {
1151                                 err_msg = e.Message;
1152                                 WebExceptionStatus wes = WebExceptionStatus.SendFailure;
1153                                 string msg = "Write: " + err_msg;
1154                                 if (e is WebException) {
1155                                         HandleError (wes, e, msg);
1156                                         return false;
1157                                 }
1158
1159                                 // if SSL is in use then check for TrustFailure
1160                                 if (ssl) {
1161 #if SECURITY_DEP && (MONOTOUCH || MONODROID)
1162                                         HttpsClientStream https = (s as HttpsClientStream);
1163                                         if (https.TrustFailure) {
1164 #else
1165                                         if ((bool) piTrustFailure.GetValue (s , null)) {
1166 #endif
1167                                                 wes = WebExceptionStatus.TrustFailure;
1168                                                 msg = "Trust failure";
1169                                         }
1170                                 }
1171
1172                                 HandleError (wes, e, msg);
1173                                 return false;
1174                         }
1175                         return true;
1176                 }
1177
1178                 internal void Close (bool sendNext)
1179                 {
1180                         lock (this) {
1181                                 if (Data != null && Data.request != null && Data.request.ReuseConnection) {
1182                                         Data.request.ReuseConnection = false;
1183                                         return;
1184                                 }
1185
1186                                 if (nstream != null) {
1187                                         try {
1188                                                 nstream.Close ();
1189                                         } catch {}
1190                                         nstream = null;
1191                                 }
1192
1193                                 if (socket != null) {
1194                                         try {
1195                                                 socket.Close ();
1196                                         } catch {}
1197                                         socket = null;
1198                                 }
1199
1200                                 if (ntlm_authenticated)
1201                                         ResetNtlm ();
1202                                 if (Data != null) {
1203                                         lock (Data) {
1204                                                 Data.ReadState = ReadState.Aborted;
1205                                         }
1206                                 }
1207                                 state.SetIdle ();
1208                                 Data = new WebConnectionData ();
1209                                 if (sendNext)
1210                                         SendNext ();
1211
1212                                 connect_request = null;
1213                                 connect_ntlm_auth_state = NtlmAuthState.None;
1214                         }
1215                 }
1216
1217                 void Abort (object sender, EventArgs args)
1218                 {
1219                         lock (this) {
1220                                 lock (queue) {
1221                                         HttpWebRequest req = (HttpWebRequest) sender;
1222                                         if (Data.request == req || Data.request == null) {
1223                                                 if (!req.FinishedReading) {
1224                                                         status = WebExceptionStatus.RequestCanceled;
1225                                                         Close (false);
1226                                                         if (queue.Count > 0) {
1227                                                                 Data.request = (HttpWebRequest) queue.Dequeue ();
1228                                                                 SendRequest (Data.request);
1229                                                         }
1230                                                 }
1231                                                 return;
1232                                         }
1233
1234                                         req.FinishedReading = true;
1235                                         req.SetResponseError (WebExceptionStatus.RequestCanceled, null, "User aborted");
1236                                         if (queue.Count > 0 && queue.Peek () == sender) {
1237                                                 queue.Dequeue ();
1238                                         } else if (queue.Count > 0) {
1239                                                 object [] old = queue.ToArray ();
1240                                                 queue.Clear ();
1241                                                 for (int i = old.Length - 1; i >= 0; i--) {
1242                                                         if (old [i] != sender)
1243                                                                 queue.Enqueue (old [i]);
1244                                                 }
1245                                         }
1246                                 }
1247                         }
1248                 }
1249
1250                 internal void ResetNtlm ()
1251                 {
1252                         ntlm_authenticated = false;
1253                         ntlm_credentials = null;
1254                         unsafe_sharing = false;
1255                 }
1256
1257                 internal bool Connected {
1258                         get {
1259                                 lock (this) {
1260                                         return (socket != null && socket.Connected);
1261                                 }
1262                         }
1263                 }
1264
1265                 // -Used for NTLM authentication
1266                 internal HttpWebRequest PriorityRequest {
1267                         set { priority_request = value; }
1268                 }
1269
1270                 internal bool NtlmAuthenticated {
1271                         get { return ntlm_authenticated; }
1272                         set { ntlm_authenticated = value; }
1273                 }
1274
1275                 internal NetworkCredential NtlmCredential {
1276                         get { return ntlm_credentials; }
1277                         set { ntlm_credentials = value; }
1278                 }
1279
1280                 internal bool UnsafeAuthenticatedConnectionSharing {
1281                         get { return unsafe_sharing; }
1282                         set { unsafe_sharing = value; }
1283                 }
1284                 // -
1285         }
1286 }
1287