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                 AsymmetricAlgorithm key;
  58
  59                 public HttpConnection (Socket sock, EndPointListener epl, bool secure, X509Certificate2 cert, AsymmetricAlgorithm key)
  60                 {
  61                         this.sock = sock;
  62                         this.epl = epl;
  63                         this.secure = secure;
  64                         this.key = key;
  65                         if (secure == false) {
  66                                 stream = new NetworkStream (sock, false);
  67                         } else {
  68                                 SslServerStream ssl_stream = new SslServerStream (new NetworkStream (sock, false), cert, false, false);
  69                                 ssl_stream.PrivateKeyCertSelectionDelegate += OnPVKSelection;
  70                                 stream = ssl_stream;
  71                         }
  72                         Init ();
  73                 }
  74
  75                 AsymmetricAlgorithm OnPVKSelection (X509Certificate certificate, string targetHost)
  76                 {
  77                         return key;
  78                 }
  79
  80
  81                 void Init ()
  82                 {
  83                         context_bound = false;
  84                         i_stream = null;
  85                         o_stream = null;
  86                         prefix = null;
  87                         chunked = false;
  88                         ms = new MemoryStream ();
  89                         position = 0;
  90                         input_state = InputState.RequestLine;
  91                         line_state = LineState.None;
  92                         context = new HttpListenerContext (this);
  93                 }
  94
  95                 public int ChunkedUses {
  96                         get { return chunked_uses; }
  97                 }
  98
  99                 public IPEndPoint LocalEndPoint {
 100                         get { return (IPEndPoint) sock.LocalEndPoint; }
 101                 }
 102
 103                 public IPEndPoint RemoteEndPoint {
 104                         get { return (IPEndPoint) sock.RemoteEndPoint; }
 105                 }
 106
 107                 public bool IsSecure {
 108                         get { return secure; }
 109                 }
 110
 111                 public ListenerPrefix Prefix {
 112                         get { return prefix; }
 113                         set { prefix = value; }
 114                 }
 115
 116                 public void BeginReadRequest ()
 117                 {
 118                         if (buffer == null)
 119                                 buffer = new byte [BufferSize];
 120                         stream.BeginRead (buffer, 0, BufferSize, OnRead, this);
 121                 }
 122
 123                 public RequestStream GetRequestStream (bool chunked, long contentlength)
 124                 {
 125                         if (i_stream == null) {
 126                                 byte [] buffer = ms.GetBuffer ();
 127                                 int length = (int) ms.Length;
 128                                 ms = null;
 129                                 if (chunked) {
 130                                         this.chunked = true;
 131                                         context.Response.SendChunked = true;
 132                                         i_stream = new ChunkedInputStream (context, stream, buffer, position, length - position);
 133                                 } else {
 134                                         i_stream = new RequestStream (stream, buffer, position, length - position, contentlength);
 135                                 }
 136                         }
 137                         return i_stream;
 138                 }
 139
 140                 public ResponseStream GetResponseStream ()
 141                 {
 142                         // TODO: can we get this stream before reading the input?
 143                         if (o_stream == null) {
 144                                 HttpListener listener = context.Listener;
 145                                 bool ign = (listener == null) ? true : listener.IgnoreWriteExceptions;
 146                                 o_stream = new ResponseStream (stream, context.Response, ign);
 147                         }
 148                         return o_stream;
 149                 }
 150
 151                 void OnRead (IAsyncResult ares)
 152                 {
 153                         // TODO: set a limit on ms length.
 154                         HttpConnection cnc = (HttpConnection) ares.AsyncState;
 155                         int nread = -1;
 156                         try {
 157                                 nread = stream.EndRead (ares);
 158                                 ms.Write (buffer, 0, nread);
 159                         } catch (Exception e) {
 160                                 Console.WriteLine (e);
 161                                 if (ms.Length > 0)
 162                                         SendError ();
 163                                 sock.Close ();
 164                                 return;
 165                         }
 166
 167                         if (nread == 0) {
 168                                 //if (ms.Length > 0)
 169                                 //      SendError (); // Why bother?
 170                                 sock.Close ();
 171                                 return;
 172                         }
 173
 174                         if (ProcessInput (ms)) {
 175                                 if (!context.HaveError)
 176                                         context.Request.FinishInitialization ();
 177
 178                                 if (context.HaveError) {
 179                                         SendError ();
 180                                         Close ();
 181                                         return;
 182                                 }
 183
 184                                 if (!epl.BindContext (context)) {
 185                                         SendError ("Invalid host", 400);
 186                                         Close ();
 187                                 }
 188                                 context_bound = true;
 189                                 return;
 190                         }
 191                         stream.BeginRead (buffer, 0, BufferSize, OnRead, cnc);
 192                 }
 193
 194                 enum InputState {
 195                         RequestLine,
 196                         Headers
 197                 }
 198
 199                 enum LineState {
 200                         None,
 201                         CR,
 202                         LF
 203                 }
 204
 205                 InputState input_state = InputState.RequestLine;
 206                 LineState line_state = LineState.None;
 207                 int position;
 208
 209                 // true -> done processing
 210                 // false -> need more input
 211                 bool ProcessInput (MemoryStream ms)
 212                 {
 213                         byte [] buffer = ms.GetBuffer ();
 214                         int len = (int) ms.Length;
 215                         int used = 0;
 216                         string line;
 217                         while ((line = ReadLine (buffer, position, len - position, ref used)) != null) {
 218                                 position += used;
 219                                 if (line == "") {
 220                                         if (input_state == InputState.RequestLine)
 221                                                 continue;
 222                                         current_line = null;
 223                                         ms = null;
 224                                         return true;
 225                                 }
 226
 227                                 if (input_state == InputState.RequestLine) {
 228                                         context.Request.SetRequestLine (line);
 229                                         input_state = InputState.Headers;
 230                                 } else {
 231                                         context.Request.AddHeader (line);
 232                                 }
 233
 234                                 if (context.HaveError)
 235                                         return true;
 236
 237                                 if (position >= len)
 238                                         break;
 239                         }
 240
 241                         if (used == len) {
 242                                 ms.SetLength (0);
 243                                 position = 0;
 244                         }
 245                         return false;
 246                 }
 247
 248                 string ReadLine (byte [] buffer, int offset, int len, ref int used)
 249                 {
 250                         if (current_line == null)
 251                                 current_line = new StringBuilder ();
 252                         int last = offset + len;
 253                         used = 0;
 254                         for (int i = offset; i < last && line_state != LineState.LF; i++) {
 255                                 used++;
 256                                 byte b = buffer [i];
 257                                 if (b == 13) {
 258                                         line_state = LineState.CR;
 259                                 } else if (b == 10) {
 260                                         line_state = LineState.LF;
 261                                 } else {
 262                                         current_line.Append ((char) b);
 263                                 }
 264                         }
 265
 266                         string result = null;
 267                         if (line_state == LineState.LF) {
 268                                 line_state = LineState.None;
 269                                 result = current_line.ToString ();
 270                                 current_line.Length = 0;
 271                         }
 272
 273                         return result;
 274                 }
 275
 276                 public void SendError (string msg, int status)
 277                 {
 278                         HttpListenerResponse response = context.Response;
 279                         response.StatusCode = status;
 280                         response.ContentType = "text/html";
 281                         string description = HttpListenerResponse.GetStatusDescription (status);
 282                         string str;
 283                         if (msg != null)
 284                                 str = String.Format ("<h1>{0} ({1})</h1>", description, msg);
 285                         else
 286                                 str = String.Format ("<h1>{0}</h1>", description);
 287
 288                         byte [] error = context.Response.ContentEncoding.GetBytes (str);
 289                         response.Close (error, false);
 290                 }
 291
 292                 public void SendError ()
 293                 {
 294                         SendError (context.ErrorMessage, context.ErrorStatus);
 295                 }
 296
 297                 public void Close ()
 298                 {
 299                         if (o_stream != null) {
 300                                 Stream st = o_stream;
 301                                 st.Close ();
 302                                 o_stream = null;
 303                         }
 304
 305                         if (sock != null) {
 306                                 if (chunked && context.Response.ForceCloseChunked == false) {
 307                                         // Don't close. Keep working.
 308                                         chunked_uses++;
 309                                         Init ();
 310                                         BeginReadRequest ();
 311                                         return;
 312                                 }
 313
 314                                 Socket s = sock;
 315                                 sock = null;
 316                                 try {
 317                                         s.Shutdown (SocketShutdown.Both);
 318                                 } finally {
 319                                         s.Close ();
 320                                 }
 321                                 if (context_bound)
 322                                         epl.UnbindContext (context);
 323                         }
 324                 }
 325         }
 326 }
 327 #endif
 328