mcs/class/System/System.Net/HttpConnection.cs

   1 //
   2 // System.Net.HttpConnection
   3 //
   4 // Author:
   5 //      Gonzalo Paniagua Javier (gonzalo@novell.com)
   6 //
   7 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if SECURITY_DEP
  30
  31 using System.IO;
  32 using System.Net.Sockets;
  33 using System.Reflection;
  34 using System.Text;
  35 using System.Threading;
  36 using System.Security.Cryptography;
  37 using System.Security.Cryptography.X509Certificates;
  38 using Mono.Security.Protocol.Tls;
  39
  40 namespace System.Net {
  41         sealed class HttpConnection
  42         {
  43                 static AsyncCallback onread_cb = new AsyncCallback (OnRead);
  44                 const int BufferSize = 8192;
  45                 Socket sock;
  46                 Stream stream;
  47                 EndPointListener epl;
  48                 MemoryStream ms;
  49                 byte [] buffer;
  50                 HttpListenerContext context;
  51                 StringBuilder current_line;
  52                 ListenerPrefix prefix;
  53                 RequestStream i_stream;
  54                 ResponseStream o_stream;
  55                 bool chunked;
  56                 int reuses;
  57                 bool context_bound;
  58                 bool secure;
  59                 AsymmetricAlgorithm key;
  60                 int s_timeout = 90000; // 90k ms for first request, 15k ms from then on
  61                 Timer timer;
  62                 IPEndPoint local_ep;
  63                 HttpListener last_listener;
  64
  65                 public HttpConnection (Socket sock, EndPointListener epl, bool secure, X509Certificate2 cert, AsymmetricAlgorithm key)
  66                 {
  67                         this.sock = sock;
  68                         this.epl = epl;
  69                         this.secure = secure;
  70                         this.key = key;
  71                         if (secure == false) {
  72                                 stream = new NetworkStream (sock, false);
  73                         } else {
  74                                 SslServerStream ssl_stream = new SslServerStream (new NetworkStream (sock, false), cert, false, false);
  75                                 ssl_stream.PrivateKeyCertSelectionDelegate += OnPVKSelection;
  76                                 stream = ssl_stream;
  77                         }
  78                         timer = new Timer (OnTimeout, null, Timeout.Infinite, Timeout.Infinite);
  79                         Init ();
  80                 }
  81
  82                 AsymmetricAlgorithm OnPVKSelection (X509Certificate certificate, string targetHost)
  83                 {
  84                         return key;
  85                 }
  86
  87                 void Init ()
  88                 {
  89                         context_bound = false;
  90                         i_stream = null;
  91                         o_stream = null;
  92                         prefix = null;
  93                         chunked = false;
  94                         ms = new MemoryStream ();
  95                         position = 0;
  96                         input_state = InputState.RequestLine;
  97                         line_state = LineState.None;
  98                         context = new HttpListenerContext (this);
  99                 }
 100
 101                 public bool IsClosed {
 102                         get { return (sock == null); }
 103                 }
 104
 105                 public int Reuses {
 106                         get { return reuses; }
 107                 }
 108
 109                 public IPEndPoint LocalEndPoint {
 110                         get {
 111                                 if (local_ep != null)
 112                                         return local_ep;
 113
 114                                 local_ep = (IPEndPoint) sock.LocalEndPoint;
 115                                 return local_ep;
 116                         }
 117                 }
 118
 119                 public IPEndPoint RemoteEndPoint {
 120                         get { return (IPEndPoint) sock.RemoteEndPoint; }
 121                 }
 122
 123                 public bool IsSecure {
 124                         get { return secure; }
 125                 }
 126
 127                 public ListenerPrefix Prefix {
 128                         get { return prefix; }
 129                         set { prefix = value; }
 130                 }
 131
 132                 void OnTimeout (object unused)
 133                 {
 134                         CloseSocket ();
 135                         Unbind ();
 136                 }
 137
 138                 public void BeginReadRequest ()
 139                 {
 140                         if (buffer == null)
 141                                 buffer = new byte [BufferSize];
 142                         try {
 143                                 if (reuses == 1)
 144                                         s_timeout = 15000;
 145                                 timer.Change (s_timeout, Timeout.Infinite);
 146                                 stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 147                         } catch {
 148                                 timer.Change (Timeout.Infinite, Timeout.Infinite);
 149                                 CloseSocket ();
 150                         }
 151                 }
 152
 153                 public RequestStream GetRequestStream (bool chunked, long contentlength)
 154                 {
 155                         if (i_stream == null) {
 156                                 byte [] buffer = ms.GetBuffer ();
 157                                 int length = (int) ms.Length;
 158                                 ms = null;
 159                                 if (chunked) {
 160                                         this.chunked = true;
 161                                         context.Response.SendChunked = true;
 162                                         i_stream = new ChunkedInputStream (context, stream, buffer, position, length - position);
 163                                 } else {
 164                                         i_stream = new RequestStream (stream, buffer, position, length - position, contentlength);
 165                                 }
 166                         }
 167                         return i_stream;
 168                 }
 169
 170                 public ResponseStream GetResponseStream ()
 171                 {
 172                         // TODO: can we get this stream before reading the input?
 173                         if (o_stream == null) {
 174                                 HttpListener listener = context.Listener;
 175                                 bool ign = (listener == null) ? true : listener.IgnoreWriteExceptions;
 176                                 o_stream = new ResponseStream (stream, context.Response, ign);
 177                         }
 178                         return o_stream;
 179                 }
 180
 181                 static void OnRead (IAsyncResult ares)
 182                 {
 183                         HttpConnection cnc = (HttpConnection) ares.AsyncState;
 184                         cnc.OnReadInternal (ares);
 185                 }
 186
 187                 void OnReadInternal (IAsyncResult ares)
 188                 {
 189                         timer.Change (Timeout.Infinite, Timeout.Infinite);
 190                         int nread = -1;
 191                         try {
 192                                 nread = stream.EndRead (ares);
 193                                 ms.Write (buffer, 0, nread);
 194                                 if (ms.Length > 32768) {
 195                                         SendError ("Bad request", 400);
 196                                         Close (true);
 197                                         return;
 198                                 }
 199                         } catch {
 200                                 if (ms != null && ms.Length > 0)
 201                                         SendError ();
 202                                 if (sock != null)
 203                                         CloseSocket ();
 204                                 return;
 205                         }
 206
 207                         if (nread == 0) {
 208                                 //if (ms.Length > 0)
 209                                 //      SendError (); // Why bother?
 210                                 CloseSocket ();
 211                                 return;
 212                         }
 213
 214                         if (ProcessInput (ms)) {
 215                                 if (!context.HaveError)
 216                                         context.Request.FinishInitialization ();
 217
 218                                 if (context.HaveError) {
 219                                         SendError ();
 220                                         Close (true);
 221                                         return;
 222                                 }
 223
 224                                 if (!epl.BindContext (context)) {
 225                                         SendError ("Invalid host", 400);
 226                                         Close (true);
 227                                 }
 228                                 if (last_listener == null)
 229                                         epl.RemoveConnection (this);
 230                                 else
 231                                         last_listener.RemoveConnection (this);
 232
 233                                 if (context.Listener != null) {
 234                                         context.Listener.AddConnection (this);
 235                                         context_bound = true;
 236                                 }
 237                                 last_listener = context.Listener;
 238                                 return;
 239                         }
 240                         stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 241                 }
 242
 243                 enum InputState {
 244                         RequestLine,
 245                         Headers
 246                 }
 247
 248                 enum LineState {
 249                         None,
 250                         CR,
 251                         LF
 252                 }
 253
 254                 InputState input_state = InputState.RequestLine;
 255                 LineState line_state = LineState.None;
 256                 int position;
 257
 258                 // true -> done processing
 259                 // false -> need more input
 260                 bool ProcessInput (MemoryStream ms)
 261                 {
 262                         byte [] buffer = ms.GetBuffer ();
 263                         int len = (int) ms.Length;
 264                         int used = 0;
 265                         string line;
 266
 267                         try {
 268                                 line = ReadLine (buffer, position, len - position, ref used);
 269                                 position += used;
 270                         } catch {
 271                                 context.ErrorMessage = "Bad request";
 272                                 context.ErrorStatus = 400;
 273                                 return true;
 274                         }
 275
 276                         do {
 277                                 if (line == null)
 278                                         break;
 279                                 if (line == "") {
 280                                         if (input_state == InputState.RequestLine)
 281                                                 continue;
 282                                         current_line = null;
 283                                         ms = null;
 284                                         return true;
 285                                 }
 286
 287                                 if (input_state == InputState.RequestLine) {
 288                                         context.Request.SetRequestLine (line);
 289                                         input_state = InputState.Headers;
 290                                 } else {
 291                                         try {
 292                                                 context.Request.AddHeader (line);
 293                                         } catch (Exception e) {
 294                                                 context.ErrorMessage = e.Message;
 295                                                 context.ErrorStatus = 400;
 296                                                 return true;
 297                                         }
 298                                 }
 299
 300                                 if (context.HaveError)
 301                                         return true;
 302
 303                                 if (position >= len)
 304                                         break;
 305                                 try {
 306                                         line = ReadLine (buffer, position, len - position, ref used);
 307                                         position += used;
 308                                 } catch {
 309                                         context.ErrorMessage = "Bad request";
 310                                         context.ErrorStatus = 400;
 311                                         return true;
 312                                 }
 313                         } while (line != null);
 314
 315                         if (used == len) {
 316                                 ms.SetLength (0);
 317                                 position = 0;
 318                         }
 319                         return false;
 320                 }
 321
 322                 string ReadLine (byte [] buffer, int offset, int len, ref int used)
 323                 {
 324                         if (current_line == null)
 325                                 current_line = new StringBuilder (128);
 326                         int last = offset + len;
 327                         used = 0;
 328                         for (int i = offset; i < last && line_state != LineState.LF; i++) {
 329                                 used++;
 330                                 byte b = buffer [i];
 331                                 if (b == 13) {
 332                                         line_state = LineState.CR;
 333                                 } else if (b == 10) {
 334                                         line_state = LineState.LF;
 335                                 } else {
 336                                         current_line.Append ((char) b);
 337                                 }
 338                         }
 339
 340                         string result = null;
 341                         if (line_state == LineState.LF) {
 342                                 line_state = LineState.None;
 343                                 result = current_line.ToString ();
 344                                 current_line.Length = 0;
 345                         }
 346
 347                         return result;
 348                 }
 349
 350                 public void SendError (string msg, int status)
 351                 {
 352                         try {
 353                                 HttpListenerResponse response = context.Response;
 354                                 response.StatusCode = status;
 355                                 response.ContentType = "text/html";
 356                                 string description = HttpListenerResponse.GetStatusDescription (status);
 357                                 string str;
 358                                 if (msg != null)
 359                                         str = String.Format ("<h1>{0} ({1})</h1>", description, msg);
 360                                 else
 361                                         str = String.Format ("<h1>{0}</h1>", description);
 362
 363                                 byte [] error = context.Response.ContentEncoding.GetBytes (str);
 364                                 response.Close (error, false);
 365                         } catch {
 366                                 // response was already closed
 367                         }
 368                 }
 369
 370                 public void SendError ()
 371                 {
 372                         SendError (context.ErrorMessage, context.ErrorStatus);
 373                 }
 374
 375                 void Unbind ()
 376                 {
 377                         if (context_bound) {
 378                                 context.Listener.RemoveConnection (this);
 379                                 epl.UnbindContext (context);
 380                                 context_bound = false;
 381                         }
 382                 }
 383
 384                 public void Close ()
 385                 {
 386                         Close (false);
 387                 }
 388
 389                 void CloseSocket ()
 390                 {
 391                         if (sock == null)
 392                                 return;
 393
 394                         try {
 395                                 sock.Close ();
 396                         } catch {
 397                         } finally {
 398                                 sock = null;
 399                         }
 400                         if (last_listener == null)
 401                                 epl.RemoveConnection (this);
 402                 }
 403
 404                 internal void Close (bool force_close)
 405                 {
 406                         if (sock != null) {
 407                                 Stream st = GetResponseStream ();
 408                                 st.Close ();
 409                                 o_stream = null;
 410                         }
 411
 412                         if (sock != null) {
 413                                 force_close |= !context.Request.KeepAlive;
 414                                 if (!force_close)
 415                                         force_close = (context.Response.Headers ["connection"] == "close");
 416                                 /*
 417                                 if (!force_close) {
 418 //                                      bool conn_close = (status_code == 400 || status_code == 408 || status_code == 411 ||
 419 //                                                      status_code == 413 || status_code == 414 || status_code == 500 ||
 420 //                                                      status_code == 503);
 421
 422                                         force_close |= (context.Request.ProtocolVersion <= HttpVersion.Version10);
 423                                 }
 424                                 */
 425
 426                                 if (!force_close && context.Request.FlushInput ()) {
 427                                         if (chunked && context.Response.ForceCloseChunked == false) {
 428                                                 // Don't close. Keep working.
 429                                                 reuses++;
 430                                                 Unbind ();
 431                                                 Init ();
 432                                                 BeginReadRequest ();
 433                                                 return;
 434                                         }
 435
 436                                         reuses++;
 437                                         Unbind ();
 438                                         Init ();
 439                                         BeginReadRequest ();
 440                                         return;
 441                                 }
 442
 443                                 Socket s = sock;
 444                                 sock = null;
 445                                 try {
 446                                         if (s != null)
 447                                                 s.Shutdown (SocketShutdown.Both);
 448                                 } catch {
 449                                 } finally {
 450                                         if (s != null)
 451                                                 s.Close ();
 452                                 }
 453                                 Unbind ();
 454                                 if (last_listener == null)
 455                                         epl.RemoveConnection (this);
 456                                 return;
 457                         }
 458                 }
 459         }
 460 }
 461 #endif
 462