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