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 using System.IO;
  32 using System.Collections;
  33 using System.Net.Sockets;
  34 using System.Reflection;
  35 using System.Security.Cryptography.X509Certificates;
  36 using System.Text;
  37 using System.Threading;
  38 #if SECURITY_DEP
  39 using Mono.Security.Protocol.Tls;
  40 #endif
  41
  42 namespace System.Net
  43 {
  44         enum ReadState
  45         {
  46                 None,
  47                 Status,
  48                 Headers,
  49                 Content
  50         }
  51
  52         class WebConnection
  53         {
  54                 ServicePoint sPoint;
  55                 Stream nstream;
  56                 Socket socket;
  57                 object socketLock = new object ();
  58                 WebExceptionStatus status;
  59                 WaitCallback initConn;
  60                 bool keepAlive;
  61                 byte [] buffer;
  62                 static AsyncCallback readDoneDelegate = new AsyncCallback (ReadDone);
  63                 EventHandler abortHandler;
  64                 AbortHelper abortHelper;
  65                 ReadState readState;
  66                 internal WebConnectionData Data;
  67                 bool chunkedRead;
  68                 ChunkStream chunkStream;
  69                 Queue queue;
  70                 bool reused;
  71                 int position;
  72                 bool busy;
  73                 HttpWebRequest priority_request;
  74                 NetworkCredential ntlm_credentials;
  75                 bool ntlm_authenticated;
  76                 bool unsafe_sharing;
  77
  78                 enum NtlmAuthState
  79                 {
  80                         None,
  81                         Challenge,
  82                         Response
  83                 }
  84                 NtlmAuthState connect_ntlm_auth_state;
  85                 HttpWebRequest connect_request;
  86
  87                 bool ssl;
  88                 bool certsAvailable;
  89                 Exception connect_exception;
  90                 static object classLock = new object ();
  91                 static Type sslStream;
  92                 static PropertyInfo piClient;
  93                 static PropertyInfo piServer;
  94                 static PropertyInfo piTrustFailure;
  95
  96 #if MONOTOUCH
  97                 static MethodInfo start_wwan;
  98
  99                 static WebConnection ()
 100                 {
 101                         Type type = Type.GetType ("MonoTouch.ObjCRuntime.Runtime, monotouch");
 102                         if (type != null)
 103                                 start_wwan = type.GetMethod ("StartWWAN", new Type [] { typeof (System.Uri) });
 104                 }
 105 #endif
 106
 107                 public WebConnection (WebConnectionGroup group, ServicePoint sPoint)
 108                 {
 109                         this.sPoint = sPoint;
 110                         buffer = new byte [4096];
 111                         readState = ReadState.None;
 112                         Data = new WebConnectionData ();
 113                         initConn = new WaitCallback (state => {
 114                                 try {
 115                                         InitConnection (state);
 116                                 } catch {}
 117                                 });
 118                         queue = group.Queue;
 119                         abortHelper = new AbortHelper ();
 120                         abortHelper.Connection = this;
 121                         abortHandler = new EventHandler (abortHelper.Abort);
 122                 }
 123
 124                 class AbortHelper {
 125                         public WebConnection Connection;
 126
 127                         public void Abort (object sender, EventArgs args)
 128                         {
 129                                 WebConnection other = ((HttpWebRequest) sender).WebConnection;
 130                                 if (other == null)
 131                                         other = Connection;
 132                                 other.Abort (sender, args);
 133                         }
 134                 }
 135
 136                 bool CanReuse ()
 137                 {
 138                         // The real condition is !(socket.Poll (0, SelectMode.SelectRead) || socket.Available != 0)
 139                         // but if there's data pending to read (!) we won't reuse the socket.
 140                         return (socket.Poll (0, SelectMode.SelectRead) == false);
 141                 }
 142
 143                 void Connect (HttpWebRequest request)
 144                 {
 145                         lock (socketLock) {
 146                                 if (socket != null && socket.Connected && status == WebExceptionStatus.Success) {
 147                                         // Take the chunked stream to the expected state (State.None)
 148                                         if (CanReuse () && CompleteChunkedRead ()) {
 149                                                 reused = true;
 150                                                 return;
 151                                         }
 152                                 }
 153
 154                                 reused = false;
 155                                 if (socket != null) {
 156                                         socket.Close();
 157                                         socket = null;
 158                                 }
 159
 160                                 chunkStream = null;
 161                                 IPHostEntry hostEntry = sPoint.HostEntry;
 162
 163                                 if (hostEntry == null) {
 164 #if MONOTOUCH
 165                                         if (start_wwan != null) {
 166                                                 start_wwan.Invoke (null, new object [1] { sPoint.Address });
 167                                                 hostEntry = sPoint.HostEntry;
 168                                         }
 169                                         if (hostEntry == null) {
 170 #endif
 171                                                 status = sPoint.UsesProxy ? WebExceptionStatus.ProxyNameResolutionFailure :
 172                                                                             WebExceptionStatus.NameResolutionFailure;
 173                                                 return;
 174 #if MONOTOUCH
 175                                         }
 176 #endif
 177                                 }
 178
 179                                 //WebConnectionData data = Data;
 180                                 foreach (IPAddress address in hostEntry.AddressList) {
 181                                         try {
 182                                                 socket = new Socket (address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
 183                                         } catch (Exception se) {
 184                                                 // The Socket ctor can throw if we run out of FD's
 185                                                 if (!request.Aborted)
 186                                                                 status = WebExceptionStatus.ConnectFailure;
 187                                                 connect_exception = se;
 188                                                 return;
 189                                         }
 190                                         IPEndPoint remote = new IPEndPoint (address, sPoint.Address.Port);
 191                                         socket.NoDelay = !sPoint.UseNagleAlgorithm;
 192                                         try {
 193                                                 sPoint.KeepAliveSetup (socket);
 194                                         } catch {
 195                                                 // Ignore. Not supported in all platforms.
 196                                         }
 197
 198                                         if (!sPoint.CallEndPointDelegate (socket, remote)) {
 199                                                 socket.Close ();
 200                                                 socket = null;
 201                                                 status = WebExceptionStatus.ConnectFailure;
 202                                         } else {
 203                                                 try {
 204                                                         if (request.Aborted)
 205                                                                 return;
 206                                                         socket.Connect (remote);
 207                                                         status = WebExceptionStatus.Success;
 208                                                         break;
 209                                                 } catch (ThreadAbortException) {
 210                                                         // program exiting...
 211                                                         Socket s = socket;
 212                                                         socket = null;
 213                                                         if (s != null)
 214                                                                 s.Close ();
 215                                                         return;
 216                                                 } catch (ObjectDisposedException) {
 217                                                         // socket closed from another thread
 218                                                         return;
 219                                                 } catch (Exception exc) {
 220                                                         Socket s = socket;
 221                                                         socket = null;
 222                                                         if (s != null)
 223                                                                 s.Close ();
 224                                                         if (!request.Aborted)
 225                                                                 status = WebExceptionStatus.ConnectFailure;
 226                                                         connect_exception = exc;
 227                                                 }
 228                                         }
 229                                 }
 230                         }
 231                 }
 232
 233                 static void EnsureSSLStreamAvailable ()
 234                 {
 235                         lock (classLock) {
 236                                 if (sslStream != null)
 237                                         return;
 238
 239 #if NET_2_1 && SECURITY_DEP
 240                                 sslStream = typeof (Mono.Security.Protocol.Tls.HttpsClientStream);
 241 #else
 242                                 // HttpsClientStream is an internal glue class in Mono.Security.dll
 243                                 sslStream = Type.GetType ("Mono.Security.Protocol.Tls.HttpsClientStream, " +
 244                                                         Consts.AssemblyMono_Security, false);
 245
 246                                 if (sslStream == null) {
 247                                         string msg = "Missing Mono.Security.dll assembly. " +
 248                                                         "Support for SSL/TLS is unavailable.";
 249
 250                                         throw new NotSupportedException (msg);
 251                                 }
 252 #endif
 253                                 piClient = sslStream.GetProperty ("SelectedClientCertificate");
 254                                 piServer = sslStream.GetProperty ("ServerCertificate");
 255                                 piTrustFailure = sslStream.GetProperty ("TrustFailure");
 256                         }
 257                 }
 258
 259                 bool CreateTunnel (HttpWebRequest request, Uri connectUri,
 260                                    Stream stream, out byte[] buffer)
 261                 {
 262                         StringBuilder sb = new StringBuilder ();
 263                         sb.Append ("CONNECT ");
 264                         sb.Append (request.Address.Host);
 265                         sb.Append (':');
 266                         sb.Append (request.Address.Port);
 267                         sb.Append (" HTTP/");
 268                         if (request.ServicePoint.ProtocolVersion == HttpVersion.Version11)
 269                                 sb.Append ("1.1");
 270                         else
 271                                 sb.Append ("1.0");
 272
 273                         sb.Append ("\r\nHost: ");
 274                         sb.Append (request.Address.Authority);
 275
 276                         bool ntlm = false;
 277                         var challenge = Data.Challenge;
 278                         Data.Challenge = null;
 279                         var auth_header = request.Headers ["Proxy-Authorization"];
 280                         bool have_auth = auth_header != null;
 281                         if (have_auth) {
 282                                 sb.Append ("\r\nProxy-Authorization: ");
 283                                 sb.Append (auth_header);
 284                                 ntlm = auth_header.ToUpper ().Contains ("NTLM");
 285                         } else if (challenge != null && Data.StatusCode == 407) {
 286                                 ICredentials creds = request.Proxy.Credentials;
 287                                 have_auth = true;
 288
 289                                 if (connect_request == null) {
 290                                         // create a CONNECT request to use with Authenticate
 291                                         connect_request = (HttpWebRequest)WebRequest.Create (
 292                                                 connectUri.Scheme + "://" + connectUri.Host + ":" + connectUri.Port + "/");
 293                                         connect_request.Method = "CONNECT";
 294                                         connect_request.Credentials = creds;
 295                                 }
 296
 297                                 for (int i = 0; i < challenge.Length; i++) {
 298                                         var auth = AuthenticationManager.Authenticate (challenge [i], connect_request, creds);
 299                                         if (auth == null)
 300                                                 continue;
 301                                         ntlm = (auth.Module.AuthenticationType == "NTLM");
 302                                         sb.Append ("\r\nProxy-Authorization: ");
 303                                         sb.Append (auth.Message);
 304                                         break;
 305                                 }
 306                         }
 307
 308                         if (ntlm) {
 309                                 sb.Append ("\r\nProxy-Connection: keep-alive");
 310                                 connect_ntlm_auth_state++;
 311                         }
 312
 313                         sb.Append ("\r\n\r\n");
 314
 315                         Data.StatusCode = 0;
 316                         byte [] connectBytes = Encoding.Default.GetBytes (sb.ToString ());
 317                         stream.Write (connectBytes, 0, connectBytes.Length);
 318
 319                         int status;
 320                         WebHeaderCollection result = ReadHeaders (stream, out buffer, out status);
 321                         if ((!have_auth || connect_ntlm_auth_state == NtlmAuthState.Challenge) &&
 322                             result != null && status == 407) { // Needs proxy auth
 323                                 var connectionHeader = result ["Connection"];
 324                                 if (socket != null && !string.IsNullOrEmpty (connectionHeader) &&
 325                                     connectionHeader.ToLower() == "close") {
 326                                         // The server is requesting that this connection be closed
 327                                         socket.Close();
 328                                         socket = null;
 329                                 }
 330
 331                                 Data.StatusCode = status;
 332                                 Data.Challenge = result.GetValues_internal ("Proxy-Authenticate", false);
 333                                 return false;
 334                         } else if (status != 200) {
 335                                 string msg = String.Format ("The remote server returned a {0} status code.", status);
 336                                 HandleError (WebExceptionStatus.SecureChannelFailure, null, msg);
 337                                 return false;
 338                         }
 339
 340                         return (result != null);
 341                 }
 342
 343                 WebHeaderCollection ReadHeaders (Stream stream, out byte [] retBuffer, out int status)
 344                 {
 345                         retBuffer = null;
 346                         status = 200;
 347
 348                         byte [] buffer = new byte [1024];
 349                         MemoryStream ms = new MemoryStream ();
 350                         bool gotStatus = false;
 351                         WebHeaderCollection headers = null;
 352
 353                         while (true) {
 354                                 int n = stream.Read (buffer, 0, 1024);
 355                                 if (n == 0) {
 356                                         HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadHeaders");
 357                                         return null;
 358                                 }
 359
 360                                 ms.Write (buffer, 0, n);
 361                                 int start = 0;
 362                                 string str = null;
 363                                 headers = new WebHeaderCollection ();
 364                                 while (ReadLine (ms.GetBuffer (), ref start, (int) ms.Length, ref str)) {
 365                                         if (str == null) {
 366                                                 int contentLen = 0;
 367                                                 try     {
 368                                                         contentLen = int.Parse(headers["Content-Length"]);
 369                                                 }
 370                                                 catch {
 371                                                         contentLen = 0;
 372                                                 }
 373
 374                                                 if (ms.Length - start - contentLen > 0) {
 375                                                         // we've read more data than the response header and conents,
 376                                                         // give back extra data to the caller
 377                                                         retBuffer = new byte[ms.Length - start - contentLen];
 378                                                         Buffer.BlockCopy(ms.GetBuffer(), start + contentLen, retBuffer, 0, retBuffer.Length);
 379                                                 }
 380                                                 else {
 381                                                         // haven't read in some or all of the contents for the response, do so now
 382                                                         FlushContents(stream, contentLen - (int)(ms.Length - start));
 383                                                 }
 384
 385                                                 return headers;
 386                                         }
 387
 388                                         if (gotStatus) {
 389                                                 headers.Add (str);
 390                                                 continue;
 391                                         }
 392
 393                                         int spaceidx = str.IndexOf (' ');
 394                                         if (spaceidx == -1) {
 395                                                 HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadHeaders2");
 396                                                 return null;
 397                                         }
 398
 399                                         status = (int) UInt32.Parse (str.Substring (spaceidx + 1, 3));
 400                                         gotStatus = true;
 401                                 }
 402                         }
 403                 }
 404
 405                 void FlushContents(Stream stream, int contentLength)
 406                 {
 407                         while (contentLength > 0) {
 408                                 byte[] contentBuffer = new byte[contentLength];
 409                                 int bytesRead = stream.Read(contentBuffer, 0, contentLength);
 410                                 if (bytesRead > 0) {
 411                                         contentLength -= bytesRead;
 412                                 }
 413                                 else {
 414                                         break;
 415                                 }
 416                         }
 417                 }
 418
 419                 bool CreateStream (HttpWebRequest request)
 420                 {
 421                         try {
 422                                 NetworkStream serverStream = new NetworkStream (socket, false);
 423
 424                                 if (request.Address.Scheme == Uri.UriSchemeHttps) {
 425                                         ssl = true;
 426                                         EnsureSSLStreamAvailable ();
 427                                         if (!reused || nstream == null || nstream.GetType () != sslStream) {
 428                                                 byte [] buffer = null;
 429                                                 if (sPoint.UseConnect) {
 430                                                         bool ok = CreateTunnel (request, sPoint.Address, serverStream, out buffer);
 431                                                         if (!ok)
 432                                                                 return false;
 433                                                 }
 434
 435                                                 object[] args = new object [4] { serverStream,
 436                                                                                 request.ClientCertificates,
 437                                                                                 request, buffer};
 438                                                 nstream = (Stream) Activator.CreateInstance (sslStream, args);
 439 #if SECURITY_DEP
 440                                                 SslClientStream scs = (SslClientStream) nstream;
 441                                                 var helper = new ServicePointManager.ChainValidationHelper (request);
 442                                                 scs.ServerCertValidation2 += new CertificateValidationCallback2 (helper.ValidateChain);
 443 #endif
 444                                                 certsAvailable = false;
 445                                         }
 446                                         // we also need to set ServicePoint.Certificate
 447                                         // and ServicePoint.ClientCertificate but this can
 448                                         // only be done later (after handshake - which is
 449                                         // done only after a read operation).
 450                                 } else {
 451                                         ssl = false;
 452                                         nstream = serverStream;
 453                                 }
 454                         } catch (Exception) {
 455                                 if (!request.Aborted)
 456                                         status = WebExceptionStatus.ConnectFailure;
 457                                 return false;
 458                         }
 459
 460                         return true;
 461                 }
 462
 463                 void HandleError (WebExceptionStatus st, Exception e, string where)
 464                 {
 465                         status = st;
 466                         lock (this) {
 467                                 if (st == WebExceptionStatus.RequestCanceled)
 468                                         Data = new WebConnectionData ();
 469                         }
 470
 471                         if (e == null) { // At least we now where it comes from
 472                                 try {
 473 #if TARGET_JVM
 474                                         throw new Exception ();
 475 #else
 476                                         throw new Exception (new System.Diagnostics.StackTrace ().ToString ());
 477 #endif
 478                                 } catch (Exception e2) {
 479                                         e = e2;
 480                                 }
 481                         }
 482
 483                         HttpWebRequest req = null;
 484                         if (Data != null && Data.request != null)
 485                                 req = Data.request;
 486
 487                         Close (true);
 488                         if (req != null) {
 489                                 req.FinishedReading = true;
 490                                 req.SetResponseError (st, e, where);
 491                         }
 492                 }
 493
 494                 static void ReadDone (IAsyncResult result)
 495                 {
 496                         WebConnection cnc = (WebConnection) result.AsyncState;
 497                         WebConnectionData data = cnc.Data;
 498                         Stream ns = cnc.nstream;
 499                         if (ns == null) {
 500                                 cnc.Close (true);
 501                                 return;
 502                         }
 503
 504                         int nread = -1;
 505                         try {
 506                                 nread = ns.EndRead (result);
 507                         } catch (ObjectDisposedException) {
 508                                 return;
 509                         } catch (Exception e) {
 510                                 if (e.InnerException is ObjectDisposedException)
 511                                         return;
 512
 513                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone1");
 514                                 return;
 515                         }
 516
 517                         if (nread == 0) {
 518                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, null, "ReadDone2");
 519                                 return;
 520                         }
 521
 522                         if (nread < 0) {
 523                                 cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadDone3");
 524                                 return;
 525                         }
 526
 527                         int pos = -1;
 528                         nread += cnc.position;
 529                         if (cnc.readState == ReadState.None) {
 530                                 Exception exc = null;
 531                                 try {
 532                                         pos = cnc.GetResponse (cnc.buffer, nread);
 533                                 } catch (Exception e) {
 534                                         exc = e;
 535                                 }
 536
 537                                 if (exc != null || pos == -1) {
 538                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, exc, "ReadDone4");
 539                                         return;
 540                                 }
 541                         }
 542
 543                         if (cnc.readState != ReadState.Content) {
 544                                 int est = nread * 2;
 545                                 int max = (est < cnc.buffer.Length) ? cnc.buffer.Length : est;
 546                                 byte [] newBuffer = new byte [max];
 547                                 Buffer.BlockCopy (cnc.buffer, 0, newBuffer, 0, nread);
 548                                 cnc.buffer = newBuffer;
 549                                 cnc.position = nread;
 550                                 cnc.readState = ReadState.None;
 551                                 InitRead (cnc);
 552                                 return;
 553                         }
 554
 555                         cnc.position = 0;
 556
 557                         WebConnectionStream stream = new WebConnectionStream (cnc);
 558                         bool expect_content = ExpectContent (data.StatusCode, data.request.Method);
 559                         string tencoding = null;
 560                         if (expect_content)
 561                                 tencoding = data.Headers ["Transfer-Encoding"];
 562
 563                         cnc.chunkedRead = (tencoding != null && tencoding.IndexOf ("chunked", StringComparison.OrdinalIgnoreCase) != -1);
 564                         if (!cnc.chunkedRead) {
 565                                 stream.ReadBuffer = cnc.buffer;
 566                                 stream.ReadBufferOffset = pos;
 567                                 stream.ReadBufferSize = nread;
 568                                 try {
 569                                         stream.CheckResponseInBuffer ();
 570                                 } catch (Exception e) {
 571                                         cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone7");
 572                                 }
 573                         } else if (cnc.chunkStream == null) {
 574                                 try {
 575                                         cnc.chunkStream = new ChunkStream (cnc.buffer, pos, nread, data.Headers);
 576                                 } catch (Exception e) {
 577                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone5");
 578                                         return;
 579                                 }
 580                         } else {
 581                                 cnc.chunkStream.ResetBuffer ();
 582                                 try {
 583                                         cnc.chunkStream.Write (cnc.buffer, pos, nread);
 584                                 } catch (Exception e) {
 585                                         cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone6");
 586                                         return;
 587                                 }
 588                         }
 589
 590                         data.stream = stream;
 591
 592                         if (!expect_content)
 593                                 stream.ForceCompletion ();
 594
 595                         data.request.SetResponseData (data);
 596                 }
 597
 598                 static bool ExpectContent (int statusCode, string method)
 599                 {
 600                         if (method == "HEAD")
 601                                 return false;
 602                         return (statusCode >= 200 && statusCode != 204 && statusCode != 304);
 603                 }
 604
 605                 internal void GetCertificates ()
 606                 {
 607                         // here the SSL negotiation have been done
 608                         X509Certificate client = (X509Certificate) piClient.GetValue (nstream, null);
 609                         X509Certificate server = (X509Certificate) piServer.GetValue (nstream, null);
 610                         sPoint.SetCertificates (client, server);
 611                         certsAvailable = (server != null);
 612                 }
 613
 614                 internal static void InitRead (object state)
 615                 {
 616                         WebConnection cnc = (WebConnection) state;
 617                         Stream ns = cnc.nstream;
 618
 619                         try {
 620                                 int size = cnc.buffer.Length - cnc.position;
 621                                 ns.BeginRead (cnc.buffer, cnc.position, size, readDoneDelegate, cnc);
 622                         } catch (Exception e) {
 623                                 cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "InitRead");
 624                         }
 625                 }
 626
 627                 int GetResponse (byte [] buffer, int max)
 628                 {
 629                         int pos = 0;
 630                         string line = null;
 631                         bool lineok = false;
 632                         bool isContinue = false;
 633                         bool emptyFirstLine = false;
 634                         do {
 635                                 if (readState == ReadState.None) {
 636                                         lineok = ReadLine (buffer, ref pos, max, ref line);
 637                                         if (!lineok)
 638                                                 return 0;
 639
 640                                         if (line == null) {
 641                                                 emptyFirstLine = true;
 642                                                 continue;
 643                                         }
 644                                         emptyFirstLine = false;
 645
 646                                         readState = ReadState.Status;
 647
 648                                         string [] parts = line.Split (' ');
 649                                         if (parts.Length < 2)
 650                                                 return -1;
 651
 652                                         if (String.Compare (parts [0], "HTTP/1.1", true) == 0) {
 653                                                 Data.Version = HttpVersion.Version11;
 654                                                 sPoint.SetVersion (HttpVersion.Version11);
 655                                         } else {
 656                                                 Data.Version = HttpVersion.Version10;
 657                                                 sPoint.SetVersion (HttpVersion.Version10);
 658                                         }
 659
 660                                         Data.StatusCode = (int) UInt32.Parse (parts [1]);
 661                                         if (parts.Length >= 3)
 662                                                 Data.StatusDescription = String.Join (" ", parts, 2, parts.Length - 2);
 663                                         else
 664                                                 Data.StatusDescription = "";
 665
 666                                         if (pos >= max)
 667                                                 return pos;
 668                                 }
 669
 670                                 emptyFirstLine = false;
 671                                 if (readState == ReadState.Status) {
 672                                         readState = ReadState.Headers;
 673                                         Data.Headers = new WebHeaderCollection ();
 674                                         ArrayList headers = new ArrayList ();
 675                                         bool finished = false;
 676                                         while (!finished) {
 677                                                 if (ReadLine (buffer, ref pos, max, ref line) == false)
 678                                                         break;
 679
 680                                                 if (line == null) {
 681                                                         // Empty line: end of headers
 682                                                         finished = true;
 683                                                         continue;
 684                                                 }
 685
 686                                                 if (line.Length > 0 && (line [0] == ' ' || line [0] == '\t')) {
 687                                                         int count = headers.Count - 1;
 688                                                         if (count < 0)
 689                                                                 break;
 690
 691                                                         string prev = (string) headers [count] + line;
 692                                                         headers [count] = prev;
 693                                                 } else {
 694                                                         headers.Add (line);
 695                                                 }
 696                                         }
 697
 698                                         if (!finished)
 699                                                 return 0;
 700
 701                                         foreach (string s in headers)
 702                                                 Data.Headers.SetInternal (s);
 703
 704                                         if (Data.StatusCode == (int) HttpStatusCode.Continue) {
 705                                                 sPoint.SendContinue = true;
 706                                                 if (pos >= max)
 707                                                         return pos;
 708
 709                                                 if (Data.request.ExpectContinue) {
 710                                                         Data.request.DoContinueDelegate (Data.StatusCode, Data.Headers);
 711                                                         // Prevent double calls when getting the
 712                                                         // headers in several packets.
 713                                                         Data.request.ExpectContinue = false;
 714                                                 }
 715
 716                                                 readState = ReadState.None;
 717                                                 isContinue = true;
 718                                         }
 719                                         else {
 720                                                 readState = ReadState.Content;
 721                                                 return pos;
 722                                         }
 723                                 }
 724                         } while (emptyFirstLine || isContinue);
 725
 726                         return -1;
 727                 }
 728
 729                 void InitConnection (object state)
 730                 {
 731                         HttpWebRequest request = (HttpWebRequest) state;
 732                         request.WebConnection = this;
 733
 734                         if (request.Aborted)
 735                                 return;
 736
 737                         keepAlive = request.KeepAlive;
 738                         Data = new WebConnectionData (request);
 739                 retry:
 740                         Connect (request);
 741                         if (request.Aborted)
 742                                 return;
 743
 744                         if (status != WebExceptionStatus.Success) {
 745                                 if (!request.Aborted) {
 746                                         request.SetWriteStreamError (status, connect_exception);
 747                                         Close (true);
 748                                 }
 749                                 return;
 750                         }
 751
 752                         if (!CreateStream (request)) {
 753                                 if (request.Aborted)
 754                                         return;
 755
 756                                 WebExceptionStatus st = status;
 757                                 if (Data.Challenge != null)
 758                                         goto retry;
 759
 760                                 Exception cnc_exc = connect_exception;
 761                                 connect_exception = null;
 762                                 request.SetWriteStreamError (st, cnc_exc);
 763                                 Close (true);
 764                                 return;
 765                         }
 766
 767                         readState = ReadState.None;
 768                         request.SetWriteStream (new WebConnectionStream (this, request));
 769                 }
 770
 771                 internal EventHandler SendRequest (HttpWebRequest request)
 772                 {
 773                         if (request.Aborted)
 774                                 return null;
 775
 776                         lock (this) {
 777                                 if (!busy) {
 778                                         busy = true;
 779                                         status = WebExceptionStatus.Success;
 780                                         ThreadPool.QueueUserWorkItem (initConn, request);
 781                                 } else {
 782                                         lock (queue) {
 783                                                 queue.Enqueue (request);
 784                                         }
 785                                 }
 786                         }
 787
 788                         return abortHandler;
 789                 }
 790
 791                 void SendNext ()
 792                 {
 793                         lock (queue) {
 794                                 if (queue.Count > 0) {
 795                                         SendRequest ((HttpWebRequest) queue.Dequeue ());
 796                                 }
 797                         }
 798                 }
 799
 800                 internal void NextRead ()
 801                 {
 802                         lock (this) {
 803                                 if (Data.request != null)
 804                                         Data.request.FinishedReading = true;
 805                                 string header = (sPoint.UsesProxy) ? "Proxy-Connection" : "Connection";
 806                                 string cncHeader = (Data.Headers != null) ? Data.Headers [header] : null;
 807                                 bool keepAlive = (Data.Version == HttpVersion.Version11 && this.keepAlive);
 808                                 if (cncHeader != null) {
 809                                         cncHeader = cncHeader.ToLower ();
 810                                         keepAlive = (this.keepAlive && cncHeader.IndexOf ("keep-alive", StringComparison.Ordinal) != -1);
 811                                 }
 812
 813                                 if ((socket != null && !socket.Connected) ||
 814                                    (!keepAlive || (cncHeader != null && cncHeader.IndexOf ("close", StringComparison.Ordinal) != -1))) {
 815                                         Close (false);
 816                                 }
 817
 818                                 busy = false;
 819                                 if (priority_request != null) {
 820                                         SendRequest (priority_request);
 821                                         priority_request = null;
 822                                 } else {
 823                                         SendNext ();
 824                                 }
 825                         }
 826                 }
 827
 828                 static bool ReadLine (byte [] buffer, ref int start, int max, ref string output)
 829                 {
 830                         bool foundCR = false;
 831                         StringBuilder text = new StringBuilder ();
 832
 833                         int c = 0;
 834                         while (start < max) {
 835                                 c = (int) buffer [start++];
 836
 837                                 if (c == '\n') {                        // newline
 838                                         if ((text.Length > 0) && (text [text.Length - 1] == '\r'))
 839                                                 text.Length--;
 840
 841                                         foundCR = false;
 842                                         break;
 843                                 } else if (foundCR) {
 844                                         text.Length--;
 845                                         break;
 846                                 }
 847
 848                                 if (c == '\r')
 849                                         foundCR = true;
 850
 851
 852                                 text.Append ((char) c);
 853                         }
 854
 855                         if (c != '\n' && c != '\r')
 856                                 return false;
 857
 858                         if (text.Length == 0) {
 859                                 output = null;
 860                                 return (c == '\n' || c == '\r');
 861                         }
 862
 863                         if (foundCR)
 864                                 text.Length--;
 865
 866                         output = text.ToString ();
 867                         return true;
 868                 }
 869
 870
 871                 internal IAsyncResult BeginRead (HttpWebRequest request, byte [] buffer, int offset, int size, AsyncCallback cb, object state)
 872                 {
 873                         Stream s = null;
 874                         lock (this) {
 875                                 if (Data.request != request)
 876                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
 877                                 if (nstream == null)
 878                                         return null;
 879                                 s = nstream;
 880                         }
 881
 882                         IAsyncResult result = null;
 883                         if (!chunkedRead || (!chunkStream.DataAvailable && chunkStream.WantMore)) {
 884                                 try {
 885                                         result = s.BeginRead (buffer, offset, size, cb, state);
 886                                         cb = null;
 887                                 } catch (Exception) {
 888                                         HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked BeginRead");
 889                                         throw;
 890                                 }
 891                         }
 892
 893                         if (chunkedRead) {
 894                                 WebAsyncResult wr = new WebAsyncResult (cb, state, buffer, offset, size);
 895                                 wr.InnerAsyncResult = result;
 896                                 if (result == null) {
 897                                         // Will be completed from the data in ChunkStream
 898                                         wr.SetCompleted (true, (Exception) null);
 899                                         wr.DoCallback ();
 900                                 }
 901                                 return wr;
 902                         }
 903
 904                         return result;
 905                 }
 906
 907                 internal int EndRead (HttpWebRequest request, IAsyncResult result)
 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                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
 915                                 s = nstream;
 916                         }
 917
 918                         int nbytes = 0;
 919                         WebAsyncResult wr = null;
 920                         IAsyncResult nsAsync = ((WebAsyncResult) result).InnerAsyncResult;
 921                         if (chunkedRead && (nsAsync is WebAsyncResult)) {
 922                                 wr = (WebAsyncResult) nsAsync;
 923                                 IAsyncResult inner = wr.InnerAsyncResult;
 924                                 if (inner != null && !(inner is WebAsyncResult))
 925                                         nbytes = s.EndRead (inner);
 926                         } else if (!(nsAsync is WebAsyncResult)) {
 927                                 nbytes = s.EndRead (nsAsync);
 928                                 wr = (WebAsyncResult) result;
 929                         }
 930
 931                         if (chunkedRead) {
 932                                 bool done = (nbytes == 0);
 933                                 try {
 934                                         chunkStream.WriteAndReadBack (wr.Buffer, wr.Offset, wr.Size, ref nbytes);
 935                                         if (!done && nbytes == 0 && chunkStream.WantMore)
 936                                                 nbytes = EnsureRead (wr.Buffer, wr.Offset, wr.Size);
 937                                 } catch (Exception e) {
 938                                         if (e is WebException)
 939                                                 throw e;
 940
 941                                         throw new WebException ("Invalid chunked data.", e,
 942                                                                 WebExceptionStatus.ServerProtocolViolation, null);
 943                                 }
 944
 945                                 if ((done || nbytes == 0) && chunkStream.ChunkLeft != 0) {
 946                                         HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked EndRead");
 947                                         throw new WebException ("Read error", null, WebExceptionStatus.ReceiveFailure, null);
 948                                 }
 949                         }
 950
 951                         return (nbytes != 0) ? nbytes : -1;
 952                 }
 953
 954                 // To be called on chunkedRead when we can read no data from the ChunkStream yet
 955                 int EnsureRead (byte [] buffer, int offset, int size)
 956                 {
 957                         byte [] morebytes = null;
 958                         int nbytes = 0;
 959                         while (nbytes == 0 && chunkStream.WantMore) {
 960                                 int localsize = chunkStream.ChunkLeft;
 961                                 if (localsize <= 0) // not read chunk size yet
 962                                         localsize = 1024;
 963                                 else if (localsize > 16384)
 964                                         localsize = 16384;
 965
 966                                 if (morebytes == null || morebytes.Length < localsize)
 967                                         morebytes = new byte [localsize];
 968
 969                                 int nread = nstream.Read (morebytes, 0, localsize);
 970                                 if (nread <= 0)
 971                                         return 0; // Error
 972
 973                                 chunkStream.Write (morebytes, 0, nread);
 974                                 nbytes += chunkStream.Read (buffer, offset + nbytes, size - nbytes);
 975                         }
 976
 977                         return nbytes;
 978                 }
 979
 980                 bool CompleteChunkedRead()
 981                 {
 982                         if (!chunkedRead || chunkStream == null)
 983                                 return true;
 984
 985                         while (chunkStream.WantMore) {
 986                                 int nbytes = nstream.Read (buffer, 0, buffer.Length);
 987                                 if (nbytes <= 0)
 988                                         return false; // Socket was disconnected
 989
 990                                 chunkStream.Write (buffer, 0, nbytes);
 991                         }
 992
 993                         return true;
 994                 }
 995
 996                 internal IAsyncResult BeginWrite (HttpWebRequest request, byte [] buffer, int offset, int size, AsyncCallback cb, object state)
 997                 {
 998                         Stream s = null;
 999                         lock (this) {
1000                                 if (Data.request != request)
1001                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1002                                 if (nstream == null)
1003                                         return null;
1004                                 s = nstream;
1005                         }
1006
1007                         IAsyncResult result = null;
1008                         try {
1009                                 result = s.BeginWrite (buffer, offset, size, cb, state);
1010                         } catch (Exception) {
1011                                 status = WebExceptionStatus.SendFailure;
1012                                 throw;
1013                         }
1014
1015                         return result;
1016                 }
1017
1018                 internal void EndWrite2 (HttpWebRequest request, IAsyncResult result)
1019                 {
1020                         if (request.FinishedReading)
1021                                 return;
1022
1023                         Stream s = null;
1024                         lock (this) {
1025                                 if (Data.request != request)
1026                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1027                                 if (nstream == null)
1028                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1029                                 s = nstream;
1030                         }
1031
1032                         try {
1033                                 s.EndWrite (result);
1034                         } catch (Exception exc) {
1035                                 status = WebExceptionStatus.SendFailure;
1036                                 if (exc.InnerException != null)
1037                                         throw exc.InnerException;
1038                                 throw;
1039                         }
1040                 }
1041
1042                 internal bool EndWrite (HttpWebRequest request, IAsyncResult result)
1043                 {
1044                         if (request.FinishedReading)
1045                                 return true;
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                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1053                                 s = nstream;
1054                         }
1055
1056                         try {
1057                                 s.EndWrite (result);
1058                                 return true;
1059                         } catch {
1060                                 status = WebExceptionStatus.SendFailure;
1061                                 return false;
1062                         }
1063                 }
1064
1065                 internal int Read (HttpWebRequest request, byte [] buffer, int offset, int size)
1066                 {
1067                         Stream s = null;
1068                         lock (this) {
1069                                 if (Data.request != request)
1070                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1071                                 if (nstream == null)
1072                                         return 0;
1073                                 s = nstream;
1074                         }
1075
1076                         int result = 0;
1077                         try {
1078                                 bool done = false;
1079                                 if (!chunkedRead) {
1080                                         result = s.Read (buffer, offset, size);
1081                                         done = (result == 0);
1082                                 }
1083
1084                                 if (chunkedRead) {
1085                                         try {
1086                                                 chunkStream.WriteAndReadBack (buffer, offset, size, ref result);
1087                                                 if (!done && result == 0 && chunkStream.WantMore)
1088                                                         result = EnsureRead (buffer, offset, size);
1089                                         } catch (Exception e) {
1090                                                 HandleError (WebExceptionStatus.ReceiveFailure, e, "chunked Read1");
1091                                                 throw;
1092                                         }
1093
1094                                         if ((done || result == 0) && chunkStream.WantMore) {
1095                                                 HandleError (WebExceptionStatus.ReceiveFailure, null, "chunked Read2");
1096                                                 throw new WebException ("Read error", null, WebExceptionStatus.ReceiveFailure, null);
1097                                         }
1098                                 }
1099                         } catch (Exception e) {
1100                                 HandleError (WebExceptionStatus.ReceiveFailure, e, "Read");
1101                         }
1102
1103                         return result;
1104                 }
1105
1106                 internal bool Write (HttpWebRequest request, byte [] buffer, int offset, int size, ref string err_msg)
1107                 {
1108                         err_msg = null;
1109                         Stream s = null;
1110                         lock (this) {
1111                                 if (Data.request != request)
1112                                         throw new ObjectDisposedException (typeof (NetworkStream).FullName);
1113                                 if (nstream == null)
1114                                         return false;
1115                                 s = nstream;
1116                         }
1117
1118                         try {
1119                                 s.Write (buffer, offset, size);
1120                                 // here SSL handshake should have been done
1121                                 if (ssl && !certsAvailable)
1122                                         GetCertificates ();
1123                         } catch (Exception e) {
1124                                 err_msg = e.Message;
1125                                 WebExceptionStatus wes = WebExceptionStatus.SendFailure;
1126                                 string msg = "Write: " + err_msg;
1127                                 if (e is WebException) {
1128                                         HandleError (wes, e, msg);
1129                                         return false;
1130                                 }
1131
1132                                 // if SSL is in use then check for TrustFailure
1133                                 if (ssl && (bool) piTrustFailure.GetValue (nstream, null)) {
1134                                         wes = WebExceptionStatus.TrustFailure;
1135                                         msg = "Trust failure";
1136                                 }
1137
1138                                 HandleError (wes, e, msg);
1139                                 return false;
1140                         }
1141                         return true;
1142                 }
1143
1144                 internal void Close (bool sendNext)
1145                 {
1146                         lock (this) {
1147                                 if (nstream != null) {
1148                                         try {
1149                                                 nstream.Close ();
1150                                         } catch {}
1151                                         nstream = null;
1152                                 }
1153
1154                                 if (socket != null) {
1155                                         try {
1156                                                 socket.Close ();
1157                                         } catch {}
1158                                         socket = null;
1159                                 }
1160
1161                                 if (ntlm_authenticated)
1162                                         ResetNtlm ();
1163                                 busy = false;
1164                                 Data = new WebConnectionData ();
1165                                 if (sendNext)
1166                                         SendNext ();
1167
1168                                 connect_request = null;
1169                                 connect_ntlm_auth_state = NtlmAuthState.None;
1170                         }
1171                 }
1172
1173                 void Abort (object sender, EventArgs args)
1174                 {
1175                         lock (this) {
1176                                 lock (queue) {
1177                                         HttpWebRequest req = (HttpWebRequest) sender;
1178                                         if (Data.request == req || Data.request == null) {
1179                                                 if (!req.FinishedReading) {
1180                                                         status = WebExceptionStatus.RequestCanceled;
1181                                                         Close (false);
1182                                                         if (queue.Count > 0) {
1183                                                                 Data.request = (HttpWebRequest) queue.Dequeue ();
1184                                                                 SendRequest (Data.request);
1185                                                         }
1186                                                 }
1187                                                 return;
1188                                         }
1189
1190                                         req.FinishedReading = true;
1191                                         req.SetResponseError (WebExceptionStatus.RequestCanceled, null, "User aborted");
1192                                         if (queue.Count > 0 && queue.Peek () == sender) {
1193                                                 queue.Dequeue ();
1194                                         } else if (queue.Count > 0) {
1195                                                 object [] old = queue.ToArray ();
1196                                                 queue.Clear ();
1197                                                 for (int i = old.Length - 1; i >= 0; i--) {
1198                                                         if (old [i] != sender)
1199                                                                 queue.Enqueue (old [i]);
1200                                                 }
1201                                         }
1202                                 }
1203                         }
1204                 }
1205
1206                 internal void ResetNtlm ()
1207                 {
1208                         ntlm_authenticated = false;
1209                         ntlm_credentials = null;
1210                         unsafe_sharing = false;
1211                 }
1212
1213                 internal bool Busy {
1214                         get { lock (this) return busy; }
1215                 }
1216
1217                 internal bool Connected {
1218                         get {
1219                                 lock (this) {
1220                                         return (socket != null && socket.Connected);
1221                                 }
1222                         }
1223                 }
1224
1225                 // -Used for NTLM authentication
1226                 internal HttpWebRequest PriorityRequest {
1227                         set { priority_request = value; }
1228                 }
1229
1230                 internal bool NtlmAuthenticated {
1231                         get { return ntlm_authenticated; }
1232                         set { ntlm_authenticated = value; }
1233                 }
1234
1235                 internal NetworkCredential NtlmCredential {
1236                         get { return ntlm_credentials; }
1237                         set { ntlm_credentials = value; }
1238                 }
1239
1240                 internal bool UnsafeAuthenticatedConnectionSharing {
1241                         get { return unsafe_sharing; }
1242                         set { unsafe_sharing = value; }
1243                 }
1244                 // -
1245         }
1246 }
1247