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                         bool gotStatus = false;
 360                         WebHeaderCollection headers = null;
 361
 362                         while (true) {
 363                                 int n = stream.Read (buffer, 0, 1024);
 364                                 if (n == 0) {
 365                                         HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadHeaders");
 366                                         return null;
 367                                 }
 368
 369                                 ms.Write (buffer, 0, n);
 370                                 int start = 0;
 371                                 string str = null;
 372                                 headers = new WebHeaderCollection ();
 373                                 while (ReadLine (ms.GetBuffer (), ref start, (int) ms.Length, ref str)) {
 374                                         if (str == null) {
 375                                                 int contentLen = 0;
 376                                                 try     {
 377                                                         contentLen = int.Parse(headers["Content-Length"]);
 378                                                 }
 379                                                 catch {
 380                                                         contentLen = 0;
 381                                                 }
 382
 383                                                 if (ms.Length - start - contentLen > 0) {
 384                                                         // we've read more data than the response header and conents,
 385                                                         // give back extra data to the caller
 386                                                         retBuffer = new byte[ms.Length - start - contentLen];
 387                                                         Buffer.BlockCopy(ms.GetBuffer(), start + contentLen, retBuffer, 0, retBuffer.Length);
 388                                                 }
 389                                                 else {
 390                                                         // haven't read in some or all of the contents for the response, do so now
 391                                                         FlushContents(stream, contentLen - (int)(ms.Length - start));
 392                                                 }
 393
 394                                                 return headers;
 395                                         }
 396
 397                                         if (gotStatus) {
 398                                                 headers.Add (str);
 399                                                 continue;
 400                                         }
 401
 402                                         int spaceidx = str.IndexOf (' ');
 403                                         if (spaceidx == -1) {
 404                                                 HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadHeaders2");
 405                                                 return null;
 406                                         }
 407
 408                                         status = (int) UInt32.Parse (str.Substring (spaceidx + 1, 3));
 409                                         gotStatus = true;
 410                                 }
 411                         }
 412                 }
 413
 414                 void FlushContents(Stream stream, int contentLength)
 415                 {
 416                         while (contentLength > 0) {
 417                                 byte[] contentBuffer = new byte[contentLength];
 418                                 int bytesRead = stream.Read(contentBuffer, 0, contentLength);
 419                                 if (bytesRead > 0) {
 420                                         contentLength -= bytesRead;
 421                                 }
 422                                 else {
 423                                         break;
 424                                 }
 425                         }
 426                 }
 427
 428                 bool CreateStream (HttpWebRequest request)
 429                 {
 430                         try {
 431                                 NetworkStream serverStream = new NetworkStream (socket, false);
 432
 433                                 if (request.Address.Scheme == Uri.UriSchemeHttps) {
 434                                         ssl = true;
 435                                         EnsureSSLStreamAvailable ();
 436                                         if (!reused || nstream == null || nstream.GetType () != sslStream) {
 437                                                 byte [] buffer = null;
 438                                                 if (sPoint.UseConnect) {
 439                                                         bool ok = CreateTunnel (request, sPoint.Address, serverStream, out buffer);
 440                                                         if (!ok)
 441                                                                 return false;
 442                                                 }
 443 #if SECURITY_DEP
 444 #if MONOTOUCH || MONODROID
 445                                                 nstream = new HttpsClientStream (serverStream, request.ClientCertificates, request, buffer);
 446 #else
 447                                                 object[] args = new object [4] { serverStream,
 448                                                         request.ClientCertificates,
 449                                                         request, buffer};
 450                                                 nstream = (Stream) Activator.CreateInstance (sslStream, args);
 451 #endif
 452                                                 SslClientStream scs = (SslClientStream) nstream;
 453                                                 var helper = new ServicePointManager.ChainValidationHelper (request, request.Address.Host);
 454                                                 scs.ServerCertValidation2 += new CertificateValidationCallback2 (helper.ValidateChain);
 455 #endif
 456                                                 certsAvailable = false;
 457                                         }
 458                                         // we also need to set ServicePoint.Certificate
 459                                         // and ServicePoint.ClientCertificate but this can
 460                                         // only be done later (after handshake - which is
 461                                         // done only after a read operation).
 462                                 } else {
 463                                         ssl = false;
 464                                         nstream = serverStream;
 465                                 }
 466                         } catch (Exception) {
 467                                 if (!request.Aborted)
 468                                         status = WebExceptionStatus.ConnectFailure;
 469                                 return false;
 470                         }
 471
 472                         return true;
 473                 }
 474
 475                 void HandleError (WebExceptionStatus st, Exception e, string where)
 476                 {
 477                         status = st;
 478                         lock (this) {
 479                                 if (st == WebExceptionStatus.RequestCanceled)
 480                                         Data = new WebConnectionData ();
 481                         }
 482
 483                         if (e == null) { // At least we now where it comes from
 484                                 try {
 485 #if TARGET_JVM
 486                                         throw new Exception ();
 487 #else
 488                                         throw new Exception (new System.Diagnostics.StackTrace ().ToString ());
 489 #endif
 490                                 } catch (Exception e2) {
 491                                         e = e2;
 492                                 }
 493                         }
 494
 495                         HttpWebRequest req = null;
 496                         if (Data != null && Data.request != null)
 497                                 req = Data.request;
 498
 499                         Close (true);
 500                         if (req != null) {
 501                                 req.FinishedReading = true;
 502                                 req.SetResponseError (st, e, where);
 503                         }
 504                 }
 505
 506                 static void ReadDone (IAsyncResult result)
 507                 {
 508                         WebConnection cnc = (WebConnection)result.AsyncState;
 509                         WebConnectionData data = cnc.Data;
 510                         Stream ns = cnc.nstream;
 511                         if (ns == null) {
 512                                 cnc.Close (true);
 513                                 return;
 514                         }
 515
 516                         int nread = -1;
 517                         try {
 518                                 nread = ns.EndRead (result);
 519                         } catch (ObjectDisposedException) {
 520                                 return;
 521                         } catch (Exception e) {
 522                                 if (e.InnerException is ObjectDisposedException)
 523                                         return;
 524
 525                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone1");
 526                                 return;
 527                         }
 528
 529                         if (nread == 0) {
 530                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, null, "ReadDone2");
 531                                 return;
 532                         }
 533
 534                         if (nread < 0) {
 535                                 cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadDone3");
 536                                 return;
 537                         }
 538
 539                         int pos = -1;
 540                         nread += cnc.position;
 541                         if (data.ReadState == ReadState.None) {
 542                                 Exception exc = null;
 543                                 try {
 544                                         pos = GetResponse (data, cnc.sPoint, cnc.buffer, nread);
 545                                 } catch (Exception e) {
 546                                         exc = e;
 547                                 }
 548
 549                                 if (exc != null || pos == -1) {
 550                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, exc, "ReadDone4");
 551                                         return;
 552                                 }
 553                         }
 554
 555                         if (data.ReadState == ReadState.Aborted) {
 556                                 cnc.HandleError (WebExceptionStatus.RequestCanceled, null, "ReadDone");
 557                                 return;
 558                         }
 559
 560                         if (data.ReadState != ReadState.Content) {
 561                                 int est = nread * 2;
 562                                 int max = (est < cnc.buffer.Length) ? cnc.buffer.Length : est;
 563                                 byte [] newBuffer = new byte [max];
 564                                 Buffer.BlockCopy (cnc.buffer, 0, newBuffer, 0, nread);
 565                                 cnc.buffer = newBuffer;
 566                                 cnc.position = nread;
 567                                 data.ReadState = ReadState.None;
 568                                 InitRead (cnc);
 569                                 return;
 570                         }
 571
 572                         cnc.position = 0;
 573
 574                         WebConnectionStream stream = new WebConnectionStream (cnc, data);
 575                         bool expect_content = ExpectContent (data.StatusCode, data.request.Method);
 576                         string tencoding = null;
 577                         if (expect_content)
 578                                 tencoding = data.Headers ["Transfer-Encoding"];
 579
 580                         cnc.chunkedRead = (tencoding != null && tencoding.IndexOf ("chunked", StringComparison.OrdinalIgnoreCase) != -1);
 581                         if (!cnc.chunkedRead) {
 582                                 stream.ReadBuffer = cnc.buffer;
 583                                 stream.ReadBufferOffset = pos;
 584                                 stream.ReadBufferSize = nread;
 585                                 try {
 586                                         stream.CheckResponseInBuffer ();
 587                                 } catch (Exception e) {
 588                                         cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone7");
 589                                 }
 590                         } else if (cnc.chunkStream == null) {
 591                                 try {
 592                                         cnc.chunkStream = new ChunkStream (cnc.buffer, pos, nread, data.Headers);
 593                                 } catch (Exception e) {
 594                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone5");
 595                                         return;
 596                                 }
 597                         } else {
 598                                 cnc.chunkStream.ResetBuffer ();
 599                                 try {
 600                                         cnc.chunkStream.Write (cnc.buffer, pos, nread);
 601                                 } catch (Exception e) {
 602                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone6");
 603                                         return;
 604                                 }
 605                         }
 606
 607                         data.stream = stream;
 608
 609                         if (!expect_content)
 610                                 stream.ForceCompletion ();
 611
 612                         data.request.SetResponseData (data);
 613                 }
 614
 615                 static bool ExpectContent (int statusCode, string method)
 616                 {
 617                         if (method == "HEAD")
 618                                 return false;
 619                         return (statusCode >= 200 && statusCode != 204 && statusCode != 304);
 620                 }
 621
 622                 internal void GetCertificates (Stream stream)
 623                 {
 624                         // here the SSL negotiation have been done
 625 #if SECURITY_DEP && (MONOTOUCH || MONODROID)
 626                         HttpsClientStream s = (stream as HttpsClientStream);
 627                         X509Certificate client = s.SelectedClientCertificate;
 628                         X509Certificate server = s.ServerCertificate;
 629 #else
 630                         X509Certificate client = (X509Certificate) piClient.GetValue (stream, null);
 631                         X509Certificate server = (X509Certificate) piServer.GetValue (stream, null);
 632 #endif
 633                         sPoint.SetCertificates (client, server);
 634                         certsAvailable = (server != null);
 635                 }
 636
 637                 internal static void InitRead (object state)
 638                 {
 639                         WebConnection cnc = (WebConnection) state;
 640                         Stream ns = cnc.nstream;
 641
 642                         try {
 643                                 int size = cnc.buffer.Length - cnc.position;
 644                                 ns.BeginRead (cnc.buffer, cnc.position, size, readDoneDelegate, cnc);
 645                         } catch (Exception e) {
 646                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "InitRead");
 647                         }
 648                 }
 649
 650                 static int GetResponse (WebConnectionData data, ServicePoint sPoint,
 651                                         byte [] buffer, int max)
 652                 {
 653                         int pos = 0;
 654                         string line = null;
 655                         bool lineok = false;
 656                         bool isContinue = false;
 657                         bool emptyFirstLine = false;
 658                         do {
 659                                 if (data.ReadState == ReadState.Aborted)
 660                                         return -1;
 661
 662                                 if (data.ReadState == ReadState.None) {
 663                                         lineok = ReadLine (buffer, ref pos, max, ref line);
 664                                         if (!lineok)
 665                                                 return 0;
 666
 667                                         if (line == null) {
 668                                                 emptyFirstLine = true;
 669                                                 continue;
 670                                         }
 671                                         emptyFirstLine = false;
 672                                         data.ReadState = ReadState.Status;
 673
 674                                         string [] parts = line.Split (' ');
 675                                         if (parts.Length < 2)
 676                                                 return -1;
 677
 678                                         if (String.Compare (parts [0], "HTTP/1.1", true) == 0) {
 679                                                 data.Version = HttpVersion.Version11;
 680                                                 sPoint.SetVersion (HttpVersion.Version11);
 681                                         } else {
 682                                                 data.Version = HttpVersion.Version10;
 683                                                 sPoint.SetVersion (HttpVersion.Version10);
 684                                         }
 685
 686                                         data.StatusCode = (int) UInt32.Parse (parts [1]);
 687                                         if (parts.Length >= 3)
 688                                                 data.StatusDescription = String.Join (" ", parts, 2, parts.Length - 2);
 689                                         else
 690                                                 data.StatusDescription = "";
 691
 692                                         if (pos >= max)
 693                                                 return pos;
 694                                 }
 695
 696                                 emptyFirstLine = false;
 697                                 if (data.ReadState == ReadState.Status) {
 698                                         data.ReadState = ReadState.Headers;
 699                                         data.Headers = new WebHeaderCollection ();
 700                                         ArrayList headers = new ArrayList ();
 701                                         bool finished = false;
 702                                         while (!finished) {
 703                                                 if (ReadLine (buffer, ref pos, max, ref line) == false)
 704                                                         break;
 705
 706                                                 if (line == null) {
 707                                                         // Empty line: end of headers
 708                                                         finished = true;
 709                                                         continue;
 710                                                 }
 711
 712                                                 if (line.Length > 0 && (line [0] == ' ' || line [0] == '\t')) {
 713                                                         int count = headers.Count - 1;
 714                                                         if (count < 0)
 715                                                                 break;
 716
 717                                                         string prev = (string) headers [count] + line;
 718                                                         headers [count] = prev;
 719                                                 } else {
 720                                                         headers.Add (line);
 721                                                 }
 722                                         }
 723
 724                                         if (!finished)
 725                                                 return 0;
 726
 727                                         foreach (string s in headers)
 728                                                 data.Headers.SetInternal (s);
 729
 730                                         if (data.StatusCode == (int) HttpStatusCode.Continue) {
 731                                                 sPoint.SendContinue = true;
 732                                                 if (pos >= max)
 733                                                         return pos;
 734
 735                                                 if (data.request.ExpectContinue) {
 736                                                         data.request.DoContinueDelegate (data.StatusCode, data.Headers);
 737                                                         // Prevent double calls when getting the
 738                                                         // headers in several packets.
 739                                                         data.request.ExpectContinue = false;
 740                                                 }
 741
 742                                                 data.ReadState = ReadState.None;
 743                                                 isContinue = true;
 744                                         }
 745                                         else {
 746                                                 data.ReadState = ReadState.Content;
 747                                                 return pos;
 748                                         }
 749                                 }
 750                         } while (emptyFirstLine || isContinue);
 751
 752                         return -1;
 753                 }
 754
 755                 void InitConnection (object state)
 756                 {
 757                         HttpWebRequest request = (HttpWebRequest) state;
 758                         request.WebConnection = this;
 759                         if (request.ReuseConnection)
 760                                 request.StoredConnection = this;
 761
 762                         if (request.Aborted)
 763                                 return;
 764
 765                         keepAlive = request.KeepAlive;
 766                         Data = new WebConnectionData (request);
 767                 retry:
 768                         Connect (request);
 769                         if (request.Aborted)
 770                                 return;
 771
 772                         if (status != WebExceptionStatus.Success) {
 773                                 if (!request.Aborted) {
 774                                         request.SetWriteStreamError (status, connect_exception);
 775                                         Close (true);
 776                                 }
 777                                 return;
 778                         }
 779
 780                         if (!CreateStream (request)) {
 781                                 if (request.Aborted)
 782                                         return;
 783
 784                                 WebExceptionStatus st = status;
 785                                 if (Data.Challenge != null)
 786                                         goto retry;
 787
 788                                 Exception cnc_exc = connect_exception;
 789                                 connect_exception = null;
 790                                 request.SetWriteStreamError (st, cnc_exc);
 791                                 Close (true);
 792                                 return;
 793                         }
 794
 795                         request.SetWriteStream (new WebConnectionStream (this, request));
 796                 }
 797
 798 #if MONOTOUCH
 799                 static bool warned_about_queue = false;
 800 #endif
 801
 802                 internal EventHandler SendRequest (HttpWebRequest request)
 803                 {
 804                         if (request.Aborted)
 805                                 return null;
 806
 807                         lock (this) {
 808                                 if (state.TrySetBusy ()) {
 809                                         status = WebExceptionStatus.Success;
 810                                         ThreadPool.QueueUserWorkItem (initConn, request);
 811                                 } else {
 812                                         lock (queue) {
 813 #if MONOTOUCH
 814                                                 if (!warned_about_queue) {
 815                                                         warned_about_queue = true;
 816                                                         Console.WriteLine ("WARNING: An HttpWebRequest was added to the ConnectionGroup queue because the connection limit was reached.");
 817                                                 }
 818 #endif
 819                                                 queue.Enqueue (request);
 820                                         }
 821                                 }
 822                         }
 823
 824                         return abortHandler;
 825                 }
 826
 827                 void SendNext ()
 828                 {
 829                         lock (queue) {
 830                                 if (queue.Count > 0) {
 831                                         SendRequest ((HttpWebRequest) queue.Dequeue ());
 832                                 }
 833                         }
 834                 }
 835
 836                 internal void NextRead ()
 837                 {
 838                         lock (this) {
 839                                 if (Data.request != null)
 840                                         Data.request.FinishedReading = true;
 841                                 string header = (sPoint.UsesProxy) ? "Proxy-Connection" : "Connection";
 842                                 string cncHeader = (Data.Headers != null) ? Data.Headers [header] : null;
 843                                 bool keepAlive = (Data.Version == HttpVersion.Version11 && this.keepAlive);
 844                                 if (cncHeader != null) {
 845                                         cncHeader = cncHeader.ToLower ();
 846                                         keepAlive = (this.keepAlive && cncHeader.IndexOf ("keep-alive", StringComparison.Ordinal) != -1);
 847                                 }
 848
 849                                 if ((socket != null && !socket.Connected) ||
 850                                    (!keepAlive || (cncHeader != null && cncHeader.IndexOf ("close", StringComparison.Ordinal) != -1))) {
 851                                         Close (false);
 852                                 }
 853
 854                                 state.SetIdle ();
 855                                 if (priority_request != null) {
 856                                         SendRequest (priority_request);
 857                                         priority_request = null;
 858                                 } else {
 859                                         SendNext ();
 860                                 }
 861                         }
 862                 }
 863
 864                 static bool ReadLine (byte [] buffer, ref int start, int max, ref string output)
 865                 {
 866                         bool foundCR = false;
 867                         StringBuilder text = new StringBuilder ();
 868
 869                         int c = 0;
 870                         while (start < max) {
 871                                 c = (int) buffer [start++];
 872
 873                                 if (c == '\n') {                        // newline
 874                                         if ((text.Length > 0) && (text [text.Length - 1] == '\r'))
 875                                                 text.Length--;
 876
 877                                         foundCR = false;
 878                                         break;
 879                                 } else if (foundCR) {
 880                                         text.Length--;
 881                                         break;
 882                                 }
 883
 884                                 if (c == '\r')
 885                                         foundCR = true;
 886
 887
 888                                 text.Append ((char) c);
 889                         }
 890
 891                         if (c != '\n' && c != '\r')
 892                                 return false;
 893
 894                         if (text.Length == 0) {
 895                                 output = null;
 896                                 return (c == '\n' || c == '\r');
 897                         }
 898
 899                         if (foundCR)
 900                                 text.Length--;
 901
 902                         output = text.ToString ();
 903                         return true;
 904                 }
 905
 906
 907                 internal IAsyncResult BeginRead (HttpWebRequest request, byte [] buffer, int offset, int size, AsyncCallback cb, object state)
 908                 {
 909                         Stream s = null;
 910                         lock (this) {
 911                                 if (Data.request != request)
 912                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
 913                                 if (nstream == null)
 914                                         return null;
 915                                 s = nstream;
 916                         }
 917
 918                         IAsyncResult result = null;
 919                         if (!chunkedRead || (!chunkStream.DataAvailable && chunkStream.WantMore)) {
 920                                 try {
 921                                         result = s.BeginRead (buffer, offset, size, cb, state);
 922                                         cb = null;
 923                                 } catch (Exception) {
 924                                         HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked BeginRead");
 925                                         throw;
 926                                 }
 927                         }
 928
 929                         if (chunkedRead) {
 930                                 WebAsyncResult wr = new WebAsyncResult (cb, state, buffer, offset, size);
 931                                 wr.InnerAsyncResult = result;
 932                                 if (result == null) {
 933                                         // Will be completed from the data in ChunkStream
 934                                         wr.SetCompleted (true, (Exception) null);
 935                                         wr.DoCallback ();
 936                                 }
 937                                 return wr;
 938                         }
 939
 940                         return result;
 941                 }
 942
 943                 internal int EndRead (HttpWebRequest request, IAsyncResult result)
 944                 {
 945                         Stream s = null;
 946                         lock (this) {
 947                                 if (Data.request != request)
 948                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
 949                                 if (nstream == null)
 950                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
 951                                 s = nstream;
 952                         }
 953
 954                         int nbytes = 0;
 955                         bool done = false;
 956                         WebAsyncResult wr = null;
 957                         IAsyncResult nsAsync = ((WebAsyncResult) result).InnerAsyncResult;
 958                         if (chunkedRead && (nsAsync is WebAsyncResult)) {
 959                                 wr = (WebAsyncResult) nsAsync;
 960                                 IAsyncResult inner = wr.InnerAsyncResult;
 961                                 if (inner != null && !(inner is WebAsyncResult)) {
 962                                         nbytes = s.EndRead (inner);
 963                                         done = nbytes == 0;
 964                                 }
 965                         } else if (!(nsAsync is WebAsyncResult)) {
 966                                 nbytes = s.EndRead (nsAsync);
 967                                 wr = (WebAsyncResult) result;
 968                                 done = nbytes == 0;
 969                         }
 970
 971                         if (chunkedRead) {
 972                                 try {
 973                                         chunkStream.WriteAndReadBack (wr.Buffer, wr.Offset, wr.Size, ref nbytes);
 974                                         if (!done && nbytes == 0 && chunkStream.WantMore)
 975                                                 nbytes = EnsureRead (wr.Buffer, wr.Offset, wr.Size);
 976                                 } catch (Exception e) {
 977                                         if (e is WebException)
 978                                                 throw e;
 979
 980                                         throw new WebException ("Invalid chunked data.", e,
 981                                                                 WebExceptionStatus.ServerProtocolViolation, null);
 982                                 }
 983
 984                                 if ((done || nbytes == 0) && chunkStream.ChunkLeft != 0) {
 985                                         HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked EndRead");
 986                                         throw new WebException ("Read error", null, WebExceptionStatus.ReceiveFailure, null);
 987                                 }
 988                         }
 989
 990                         return (nbytes != 0) ? nbytes : -1;
 991                 }
 992
 993                 // To be called on chunkedRead when we can read no data from the ChunkStream yet
 994                 int EnsureRead (byte [] buffer, int offset, int size)
 995                 {
 996                         byte [] morebytes = null;
 997                         int nbytes = 0;
 998                         while (nbytes == 0 && chunkStream.WantMore) {
 999                                 int localsize = chunkStream.ChunkLeft;
1000                                 if (localsize <= 0) // not read chunk size yet
1001                                         localsize = 1024;
1002                                 else if (localsize > 16384)
1003                                         localsize = 16384;
1004
1005                                 if (morebytes == null || morebytes.Length < localsize)
1006                                         morebytes = new byte [localsize];
1007
1008                                 int nread = nstream.Read (morebytes, 0, localsize);
1009                                 if (nread <= 0)
1010                                         return 0; // Error
1011
1012                                 chunkStream.Write (morebytes, 0, nread);
1013                                 nbytes += chunkStream.Read (buffer, offset + nbytes, size - nbytes);
1014                         }
1015
1016                         return nbytes;
1017                 }
1018
1019                 bool CompleteChunkedRead()
1020                 {
1021                         if (!chunkedRead || chunkStream == null)
1022                                 return true;
1023
1024                         while (chunkStream.WantMore) {
1025                                 int nbytes = nstream.Read (buffer, 0, buffer.Length);
1026                                 if (nbytes <= 0)
1027                                         return false; // Socket was disconnected
1028
1029                                 chunkStream.Write (buffer, 0, nbytes);
1030                         }
1031
1032                         return true;
1033                 }
1034
1035                 internal IAsyncResult BeginWrite (HttpWebRequest request, byte [] buffer, int offset, int size, AsyncCallback cb, object state)
1036                 {
1037                         Stream s = null;
1038                         lock (this) {
1039                                 if (Data.request != request)
1040                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1041                                 if (nstream == null)
1042                                         return null;
1043                                 s = nstream;
1044                         }
1045
1046                         IAsyncResult result = null;
1047                         try {
1048                                 result = s.BeginWrite (buffer, offset, size, cb, state);
1049                         } catch (Exception) {
1050                                 status = WebExceptionStatus.SendFailure;
1051                                 throw;
1052                         }
1053
1054                         return result;
1055                 }
1056
1057                 internal bool EndWrite (HttpWebRequest request, bool throwOnError, IAsyncResult result)
1058                 {
1059                         if (request.FinishedReading)
1060                                 return true;
1061
1062                         Stream s = null;
1063                         lock (this) {
1064                                 if (Data.request != request)
1065                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1066                                 if (nstream == null)
1067                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1068                                 s = nstream;
1069                         }
1070
1071                         try {
1072                                 s.EndWrite (result);
1073                                 return true;
1074                         } catch (Exception exc) {
1075                                 status = WebExceptionStatus.SendFailure;
1076                                 if (throwOnError && exc.InnerException != null)
1077                                         throw exc.InnerException;
1078                                 return false;
1079                         }
1080                 }
1081
1082                 internal int Read (HttpWebRequest request, byte [] buffer, int offset, int size)
1083                 {
1084                         Stream s = null;
1085                         lock (this) {
1086                                 if (Data.request != request)
1087                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1088                                 if (nstream == null)
1089                                         return 0;
1090                                 s = nstream;
1091                         }
1092
1093                         int result = 0;
1094                         try {
1095                                 bool done = false;
1096                                 if (!chunkedRead) {
1097                                         result = s.Read (buffer, offset, size);
1098                                         done = (result == 0);
1099                                 }
1100
1101                                 if (chunkedRead) {
1102                                         try {
1103                                                 chunkStream.WriteAndReadBack (buffer, offset, size, ref result);
1104                                                 if (!done && result == 0 && chunkStream.WantMore)
1105                                                         result = EnsureRead (buffer, offset, size);
1106                                         } catch (Exception e) {
1107                                                 HandleError (WebExceptionStatus.ReceiveFailure, e, "chunked Read1");
1108                                                 throw;
1109                                         }
1110
1111                                         if ((done || result == 0) && chunkStream.WantMore) {
1112                                                 HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked Read2");
1113                                                 throw new WebException ("Read error", null, WebExceptionStatus.ReceiveFailure, null);
1114                                         }
1115                                 }
1116                         } catch (Exception e) {
1117                                 HandleError (WebExceptionStatus.ReceiveFailure, e, "Read");
1118                         }
1119
1120                         return result;
1121                 }
1122
1123                 internal bool Write (HttpWebRequest request, byte [] buffer, int offset, int size, ref string err_msg)
1124                 {
1125                         err_msg = null;
1126                         Stream s = null;
1127                         lock (this) {
1128                                 if (Data.request != request)
1129                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1130                                 s = nstream;
1131                                 if (s == null)
1132                                         return false;
1133                         }
1134
1135                         try {
1136                                 s.Write (buffer, offset, size);
1137                                 // here SSL handshake should have been done
1138                                 if (ssl && !certsAvailable)
1139                                         GetCertificates (s);
1140                         } catch (Exception e) {
1141                                 err_msg = e.Message;
1142                                 WebExceptionStatus wes = WebExceptionStatus.SendFailure;
1143                                 string msg = "Write: " + err_msg;
1144                                 if (e is WebException) {
1145                                         HandleError (wes, e, msg);
1146                                         return false;
1147                                 }
1148
1149                                 // if SSL is in use then check for TrustFailure
1150                                 if (ssl) {
1151 #if SECURITY_DEP && (MONOTOUCH || MONODROID)
1152                                         HttpsClientStream https = (s as HttpsClientStream);
1153                                         if (https.TrustFailure) {
1154 #else
1155                                         if ((bool) piTrustFailure.GetValue (s , null)) {
1156 #endif
1157                                                 wes = WebExceptionStatus.TrustFailure;
1158                                                 msg = "Trust failure";
1159                                         }
1160                                 }
1161
1162                                 HandleError (wes, e, msg);
1163                                 return false;
1164                         }
1165                         return true;
1166                 }
1167
1168                 internal void Close (bool sendNext)
1169                 {
1170                         lock (this) {
1171                                 if (Data != null && Data.request != null && Data.request.ReuseConnection) {
1172                                         Data.request.ReuseConnection = false;
1173                                         return;
1174                                 }
1175
1176                                 if (nstream != null) {
1177                                         try {
1178                                                 nstream.Close ();
1179                                         } catch {}
1180                                         nstream = null;
1181                                 }
1182
1183                                 if (socket != null) {
1184                                         try {
1185                                                 socket.Close ();
1186                                         } catch {}
1187                                         socket = null;
1188                                 }
1189
1190                                 if (ntlm_authenticated)
1191                                         ResetNtlm ();
1192                                 if (Data != null) {
1193                                         lock (Data) {
1194                                                 Data.ReadState = ReadState.Aborted;
1195                                         }
1196                                 }
1197                                 state.SetIdle ();
1198                                 Data = new WebConnectionData ();
1199                                 if (sendNext)
1200                                         SendNext ();
1201
1202                                 connect_request = null;
1203                                 connect_ntlm_auth_state = NtlmAuthState.None;
1204                         }
1205                 }
1206
1207                 void Abort (object sender, EventArgs args)
1208                 {
1209                         lock (this) {
1210                                 lock (queue) {
1211                                         HttpWebRequest req = (HttpWebRequest) sender;
1212                                         if (Data.request == req || Data.request == null) {
1213                                                 if (!req.FinishedReading) {
1214                                                         status = WebExceptionStatus.RequestCanceled;
1215                                                         Close (false);
1216                                                         if (queue.Count > 0) {
1217                                                                 Data.request = (HttpWebRequest) queue.Dequeue ();
1218                                                                 SendRequest (Data.request);
1219                                                         }
1220                                                 }
1221                                                 return;
1222                                         }
1223
1224                                         req.FinishedReading = true;
1225                                         req.SetResponseError (WebExceptionStatus.RequestCanceled, null, "User aborted");
1226                                         if (queue.Count > 0 && queue.Peek () == sender) {
1227                                                 queue.Dequeue ();
1228                                         } else if (queue.Count > 0) {
1229                                                 object [] old = queue.ToArray ();
1230                                                 queue.Clear ();
1231                                                 for (int i = old.Length - 1; i >= 0; i--) {
1232                                                         if (old [i] != sender)
1233                                                                 queue.Enqueue (old [i]);
1234                                                 }
1235                                         }
1236                                 }
1237                         }
1238                 }
1239
1240                 internal void ResetNtlm ()
1241                 {
1242                         ntlm_authenticated = false;
1243                         ntlm_credentials = null;
1244                         unsafe_sharing = false;
1245                 }
1246
1247                 internal bool Connected {
1248                         get {
1249                                 lock (this) {
1250                                         return (socket != null && socket.Connected);
1251                                 }
1252                         }
1253                 }
1254
1255                 // -Used for NTLM authentication
1256                 internal HttpWebRequest PriorityRequest {
1257                         set { priority_request = value; }
1258                 }
1259
1260                 internal bool NtlmAuthenticated {
1261                         get { return ntlm_authenticated; }
1262                         set { ntlm_authenticated = value; }
1263                 }
1264
1265                 internal NetworkCredential NtlmCredential {
1266                         get { return ntlm_credentials; }
1267                         set { ntlm_credentials = value; }
1268                 }
1269
1270                 internal bool UnsafeAuthenticatedConnectionSharing {
1271                         get { return unsafe_sharing; }
1272                         set { unsafe_sharing = value; }
1273                 }
1274                 // -
1275         }
1276 }
1277