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 NET_2_0 && SECURITY_DEP
  30
  31 using System.IO;
  32 using System.Net.Sockets;
  33 using System.Reflection;
  34 using System.Text;
  35 using System.Security.Cryptography;
  36 using System.Security.Cryptography.X509Certificates;
  37 using Mono.Security.Protocol.Tls;
  38
  39 namespace System.Net {
  40         sealed class HttpConnection
  41         {
  42                 const int BufferSize = 8192;
  43                 Socket sock;
  44                 Stream stream;
  45                 EndPointListener epl;
  46                 MemoryStream ms;
  47                 byte [] buffer;
  48                 HttpListenerContext context;
  49                 StringBuilder current_line;
  50                 ListenerPrefix prefix;
  51                 RequestStream i_stream;
  52                 ResponseStream o_stream;
  53                 bool chunked;
  54                 int chunked_uses;
  55                 bool context_bound;
  56                 bool secure;
  57                 X509Certificate2 cert;
  58                 AsymmetricAlgorithm key;
  59
  60                 public HttpConnection (Socket sock, EndPointListener epl, bool secure, X509Certificate2 cert, AsymmetricAlgorithm key)
  61                 {
  62                         this.sock = sock;
  63                         this.epl = epl;
  64                         this.secure = secure;
  65                         this.cert = cert;
  66                         this.key = key;
  67                         if (secure == false) {
  68                                 stream = new NetworkStream (sock, false);
  69                         } else {
  70                                 SslServerStream ssl_stream = new SslServerStream (new NetworkStream (sock, false), cert, false, false);
  71                                 ssl_stream.PrivateKeyCertSelectionDelegate += OnPVKSelection;
  72                                 stream = ssl_stream;
  73                         }
  74                         Init ();
  75                 }
  76
  77                 AsymmetricAlgorithm OnPVKSelection (X509Certificate certificate, string targetHost)
  78                 {
  79                         return key;
  80                 }
  81
  82
  83                 void Init ()
  84                 {
  85                         context_bound = false;
  86                         i_stream = null;
  87                         o_stream = null;
  88                         prefix = null;
  89                         chunked = false;
  90                         ms = new MemoryStream ();
  91                         position = 0;
  92                         input_state = InputState.RequestLine;
  93                         line_state = LineState.None;
  94                         context = new HttpListenerContext (this);
  95                 }
  96
  97                 public int ChunkedUses {
  98                         get { return chunked_uses; }
  99                 }
 100
 101                 public IPEndPoint LocalEndPoint {
 102                         get { return (IPEndPoint) sock.LocalEndPoint; }
 103                 }
 104
 105                 public IPEndPoint RemoteEndPoint {
 106                         get { return (IPEndPoint) sock.RemoteEndPoint; }
 107                 }
 108
 109                 public bool IsSecure {
 110                         get { return secure; }
 111                 }
 112
 113                 public ListenerPrefix Prefix {
 114                         get { return prefix; }
 115                         set { prefix = value; }
 116                 }
 117
 118                 public void BeginReadRequest ()
 119                 {
 120                         if (buffer == null)
 121                                 buffer = new byte [BufferSize];
 122                         stream.BeginRead (buffer, 0, BufferSize, OnRead, this);
 123                 }
 124
 125                 public RequestStream GetRequestStream (bool chunked, long contentlength)
 126                 {
 127                         if (i_stream == null) {
 128                                 byte [] buffer = ms.GetBuffer ();
 129                                 int length = (int) ms.Length;
 130                                 ms = null;
 131                                 if (chunked) {
 132                                         this.chunked = true;
 133                                         context.Response.SendChunked = true;
 134                                         i_stream = new ChunkedInputStream (context, stream, buffer, position, length - position);
 135                                 } else {
 136                                         i_stream = new RequestStream (stream, buffer, position, length - position, contentlength);
 137                                 }
 138                         }
 139                         return i_stream;
 140                 }
 141
 142                 public ResponseStream GetResponseStream ()
 143                 {
 144                         // TODO: can we get this stream before reading the input?
 145                         if (o_stream == null) {
 146                                 HttpListener listener = context.Listener;
 147                                 bool ign = (listener == null) ? true : listener.IgnoreWriteExceptions;
 148                                 o_stream = new ResponseStream (stream, context.Response, ign);
 149                         }
 150                         return o_stream;
 151                 }
 152
 153                 void OnRead (IAsyncResult ares)
 154                 {
 155                         // TODO: set a limit on ms length.
 156                         HttpConnection cnc = (HttpConnection) ares.AsyncState;
 157                         int nread = -1;
 158                         try {
 159                                 nread = stream.EndRead (ares);
 160                                 ms.Write (buffer, 0, nread);
 161                         } catch (Exception e) {
 162                                 Console.WriteLine (e);
 163                                 if (ms.Length > 0)
 164                                         SendError ();
 165                                 sock.Close ();
 166                                 return;
 167                         }
 168
 169                         if (nread == 0) {
 170                                 //if (ms.Length > 0)
 171                                 //      SendError (); // Why bother?
 172                                 sock.Close ();
 173                                 return;
 174                         }
 175
 176                         if (ProcessInput (ms)) {
 177                                 if (!context.HaveError)
 178                                         context.Request.FinishInitialization ();
 179
 180                                 if (context.HaveError) {
 181                                         SendError ();
 182                                         Close ();
 183                                         return;
 184                                 }
 185
 186                                 if (!epl.BindContext (context)) {
 187                                         SendError ("Invalid host", 400);
 188                                         Close ();
 189                                 }
 190                                 context_bound = true;
 191                                 return;
 192                         }
 193                         stream.BeginRead (buffer, 0, BufferSize, OnRead, cnc);
 194                 }
 195
 196                 enum InputState {
 197                         RequestLine,
 198                         Headers
 199                 }
 200
 201                 enum LineState {
 202                         None,
 203                         CR,
 204                         LF
 205                 }
 206
 207                 InputState input_state = InputState.RequestLine;
 208                 LineState line_state = LineState.None;
 209                 int position;
 210
 211                 // true -> done processing
 212                 // false -> need more input
 213                 bool ProcessInput (MemoryStream ms)
 214                 {
 215                         byte [] buffer = ms.GetBuffer ();
 216                         int len = (int) ms.Length;
 217                         int used = 0;
 218                         string line;
 219                         while ((line = ReadLine (buffer, position, len - position, ref used)) != null) {
 220                                 position += used;
 221                                 if (line == "") {
 222                                         if (input_state == InputState.RequestLine)
 223                                                 continue;
 224                                         current_line = null;
 225                                         ms = null;
 226                                         return true;
 227                                 }
 228
 229                                 if (input_state == InputState.RequestLine) {
 230                                         context.Request.SetRequestLine (line);
 231                                         input_state = InputState.Headers;
 232                                 } else {
 233                                         context.Request.AddHeader (line);
 234                                 }
 235
 236                                 if (context.HaveError)
 237                                         return true;
 238
 239                                 if (position >= len)
 240                                         break;
 241                         }
 242
 243                         if (used == len) {
 244                                 ms.SetLength (0);
 245                                 position = 0;
 246                         }
 247                         return false;
 248                 }
 249
 250                 string ReadLine (byte [] buffer, int offset, int len, ref int used)
 251                 {
 252                         if (current_line == null)
 253                                 current_line = new StringBuilder ();
 254                         int last = offset + len;
 255                         used = 0;
 256                         for (int i = offset; i < last && line_state != LineState.LF; i++) {
 257                                 used++;
 258                                 byte b = buffer [i];
 259                                 if (b == 13) {
 260                                         line_state = LineState.CR;
 261                                 } else if (b == 10) {
 262                                         line_state = LineState.LF;
 263                                 } else {
 264                                         current_line.Append ((char) b);
 265                                 }
 266                         }
 267
 268                         string result = null;
 269                         if (line_state == LineState.LF) {
 270                                 line_state = LineState.None;
 271                                 result = current_line.ToString ();
 272                                 current_line.Length = 0;
 273                         }
 274
 275                         return result;
 276                 }
 277
 278                 public void SendError (string msg, int status)
 279                 {
 280                         HttpListenerResponse response = context.Response;
 281                         response.StatusCode = status;
 282                         response.ContentType = "text/html";
 283                         string description = HttpListenerResponse.GetStatusDescription (status);
 284                         string str;
 285                         if (msg != null)
 286                                 str = String.Format ("<h1>{0} ({1})</h1>", description, msg);
 287                         else
 288                                 str = String.Format ("<h1>{0}</h1>", description);
 289
 290                         byte [] error = context.Response.ContentEncoding.GetBytes (str);
 291                         response.Close (error, false);
 292                 }
 293
 294                 public void SendError ()
 295                 {
 296                         SendError (context.ErrorMessage, context.ErrorStatus);
 297                 }
 298
 299                 public void Close ()
 300                 {
 301                         if (o_stream != null) {
 302                                 Stream st = o_stream;
 303                                 st.Close ();
 304                                 o_stream = null;
 305                         }
 306
 307                         if (sock != null) {
 308                                 if (chunked && context.Response.ForceCloseChunked == false) {
 309                                         // Don't close. Keep working.
 310                                         chunked_uses++;
 311                                         Init ();
 312                                         BeginReadRequest ();
 313                                         return;
 314                                 }
 315
 316                                 Socket s = sock;
 317                                 sock = null;
 318                                 s.Shutdown (SocketShutdown.Both);
 319                                 s.Close ();
 320                                 if (context_bound)
 321                                         epl.UnbindContext (context);
 322                         }
 323                 }
 324         }
 325 }
 326 #endif
 327