mcs/class/System/System.Net/HttpListenerRequest.cs

   1 //
   2 // System.Net.HttpListenerRequest
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
   6 //      Marek Safar (marek.safar@gmail.com)
   7 //
   8 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
   9 // Copyright (c) 2011-2012 Xamarin, Inc. (http://xamarin.com)
  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 using System.Collections;
  34 using System.Collections.Specialized;
  35 using System.Globalization;
  36 using System.IO;
  37 using System.Security.Cryptography.X509Certificates;
  38 using System.Text;
  39 using System.Security.Authentication.ExtendedProtection;
  40 using System.Threading.Tasks;
  41 using System.Net;
  42
  43 namespace System.Net {
  44         public sealed class HttpListenerRequest
  45         {
  46                 class Context : TransportContext
  47                 {
  48                         public override ChannelBinding GetChannelBinding (ChannelBindingKind kind)
  49                         {
  50                                 throw new NotImplementedException ();
  51                         }
  52                 }
  53
  54                 string [] accept_types;
  55                 Encoding content_encoding;
  56                 long content_length;
  57                 bool cl_set;
  58                 CookieCollection cookies;
  59                 WebHeaderCollection headers;
  60                 string method;
  61                 Stream input_stream;
  62                 Version version;
  63                 NameValueCollection query_string; // check if null is ok, check if read-only, check case-sensitiveness
  64                 string raw_url;
  65                 Uri url;
  66                 Uri referrer;
  67                 string [] user_languages;
  68                 HttpListenerContext context;
  69                 bool is_chunked;
  70                 bool ka_set;
  71                 bool keep_alive;
  72                 delegate X509Certificate2 GCCDelegate ();
  73                 GCCDelegate gcc_delegate;
  74
  75                 static byte [] _100continue = Encoding.ASCII.GetBytes ("HTTP/1.1 100 Continue\r\n\r\n");
  76
  77                 internal HttpListenerRequest (HttpListenerContext context)
  78                 {
  79                         this.context = context;
  80                         headers = new WebHeaderCollection ();
  81                         version = HttpVersion.Version10;
  82                 }
  83
  84                 static char [] separators = new char [] { ' ' };
  85
  86                 internal void SetRequestLine (string req)
  87                 {
  88                         string [] parts = req.Split (separators, 3);
  89                         if (parts.Length != 3) {
  90                                 context.ErrorMessage = "Invalid request line (parts).";
  91                                 return;
  92                         }
  93
  94                         method = parts [0];
  95                         foreach (char c in method){
  96                                 int ic = (int) c;
  97
  98                                 if ((ic >= 'A' && ic <= 'Z') ||
  99                                     (ic > 32 && c < 127 && c != '(' && c != ')' && c != '<' &&
 100                                      c != '<' && c != '>' && c != '@' && c != ',' && c != ';' &&
 101                                      c != ':' && c != '\\' && c != '"' && c != '/' && c != '[' &&
 102                                      c != ']' && c != '?' && c != '=' && c != '{' && c != '}'))
 103                                         continue;
 104
 105                                 context.ErrorMessage = "(Invalid verb)";
 106                                 return;
 107                         }
 108
 109                         raw_url = parts [1];
 110                         if (parts [2].Length != 8 || !parts [2].StartsWith ("HTTP/")) {
 111                                 context.ErrorMessage = "Invalid request line (version).";
 112                                 return;
 113                         }
 114
 115                         try {
 116                                 version = new Version (parts [2].Substring (5));
 117                                 if (version.Major < 1)
 118                                         throw new Exception ();
 119                         } catch {
 120                                 context.ErrorMessage = "Invalid request line (version).";
 121                                 return;
 122                         }
 123                 }
 124
 125                 void CreateQueryString (string query)
 126                 {
 127                         if (query == null || query.Length == 0) {
 128                                 query_string = new NameValueCollection (1);
 129                                 return;
 130                         }
 131
 132                         query_string = new NameValueCollection ();
 133                         if (query [0] == '?')
 134                                 query = query.Substring (1);
 135                         string [] components = query.Split ('&');
 136                         foreach (string kv in components) {
 137                                 int pos = kv.IndexOf ('=');
 138                                 if (pos == -1) {
 139                                         query_string.Add (null, WebUtility.UrlDecode (kv));
 140                                 } else {
 141                                         string key = WebUtility.UrlDecode (kv.Substring (0, pos));
 142                                         string val = WebUtility.UrlDecode (kv.Substring (pos + 1));
 143
 144                                         query_string.Add (key, val);
 145                                 }
 146                         }
 147                 }
 148
 149                 internal void FinishInitialization ()
 150                 {
 151                         string host = UserHostName;
 152                         if (version > HttpVersion.Version10 && (host == null || host.Length == 0)) {
 153                                 context.ErrorMessage = "Invalid host name";
 154                                 return;
 155                         }
 156
 157                         string path;
 158                         Uri raw_uri = null;
 159                         if (Uri.MaybeUri (raw_url.ToLowerInvariant ()) && Uri.TryCreate (raw_url, UriKind.Absolute, out raw_uri))
 160                                 path = raw_uri.PathAndQuery;
 161                         else
 162                                 path = raw_url;
 163
 164                         if ((host == null || host.Length == 0))
 165                                 host = UserHostAddress;
 166
 167                         if (raw_uri != null)
 168                                 host = raw_uri.Host;
 169
 170                         int colon = host.IndexOf (':');
 171                         if (colon >= 0)
 172                                 host = host.Substring (0, colon);
 173
 174                         string base_uri = String.Format ("{0}://{1}:{2}",
 175                                                                 (IsSecureConnection) ? "https" : "http",
 176                                                                 host, LocalEndPoint.Port);
 177
 178                         if (!Uri.TryCreate (base_uri + path, UriKind.Absolute, out url)){
 179                                 context.ErrorMessage = WebUtility.HtmlEncode ("Invalid url: " + base_uri + path);
 180                                 return;
 181                         }
 182
 183                         CreateQueryString (url.Query);
 184
 185                         // Use reference source HttpListenerRequestUriBuilder to process url.
 186                         // Fixes #29927
 187                         url = HttpListenerRequestUriBuilder.GetRequestUri (raw_url, url.Scheme,
 188                                                                 url.Authority, url.LocalPath, url.Query);
 189
 190                         if (version >= HttpVersion.Version11) {
 191                                 string t_encoding = Headers ["Transfer-Encoding"];
 192                                 is_chunked = (t_encoding != null && String.Compare (t_encoding, "chunked", StringComparison.OrdinalIgnoreCase) == 0);
 193                                 // 'identity' is not valid!
 194                                 if (t_encoding != null && !is_chunked) {
 195                                         context.Connection.SendError (null, 501);
 196                                         return;
 197                                 }
 198                         }
 199
 200                         if (!is_chunked && !cl_set) {
 201                                 if (String.Compare (method, "POST", StringComparison.OrdinalIgnoreCase) == 0 ||
 202                                     String.Compare (method, "PUT", StringComparison.OrdinalIgnoreCase) == 0) {
 203                                         context.Connection.SendError (null, 411);
 204                                         return;
 205                                 }
 206                         }
 207
 208                         if (String.Compare (Headers ["Expect"], "100-continue", StringComparison.OrdinalIgnoreCase) == 0) {
 209                                 ResponseStream output = context.Connection.GetResponseStream ();
 210                                 output.InternalWrite (_100continue, 0, _100continue.Length);
 211                         }
 212                 }
 213
 214                 internal static string Unquote (String str) {
 215                         int start = str.IndexOf ('\"');
 216                         int end = str.LastIndexOf ('\"');
 217                         if (start >= 0 && end >=0)
 218                                 str = str.Substring (start + 1, end - 1);
 219                         return str.Trim ();
 220                 }
 221
 222                 internal void AddHeader (string header)
 223                 {
 224                         int colon = header.IndexOf (':');
 225                         if (colon == -1 || colon == 0) {
 226                                 context.ErrorMessage = "Bad Request";
 227                                 context.ErrorStatus = 400;
 228                                 return;
 229                         }
 230
 231                         string name = header.Substring (0, colon).Trim ();
 232                         string val = header.Substring (colon + 1).Trim ();
 233                         string lower = name.ToLower (CultureInfo.InvariantCulture);
 234                         headers.SetInternal (name, val);
 235                         switch (lower) {
 236                                 case "accept-language":
 237                                         user_languages = val.Split (','); // yes, only split with a ','
 238                                         break;
 239                                 case "accept":
 240                                         accept_types = val.Split (','); // yes, only split with a ','
 241                                         break;
 242                                 case "content-length":
 243                                         try {
 244                                                 //TODO: max. content_length?
 245                                                 content_length = Int64.Parse (val.Trim ());
 246                                                 if (content_length < 0)
 247                                                         context.ErrorMessage = "Invalid Content-Length.";
 248                                                 cl_set = true;
 249                                         } catch {
 250                                                 context.ErrorMessage = "Invalid Content-Length.";
 251                                         }
 252
 253                                         break;
 254                                 case "referer":
 255                                         try {
 256                                                 referrer = new Uri (val);
 257                                         } catch {
 258                                                 referrer = new Uri ("http://someone.is.screwing.with.the.headers.com/");
 259                                         }
 260                                         break;
 261                                 case "cookie":
 262                                         if (cookies == null)
 263                                                 cookies = new CookieCollection();
 264
 265                                         string[] cookieStrings = val.Split(new char[] {',', ';'});
 266                                         Cookie current = null;
 267                                         int version = 0;
 268                                         foreach (string cookieString in cookieStrings) {
 269                                                 string str = cookieString.Trim ();
 270                                                 if (str.Length == 0)
 271                                                         continue;
 272                                                 if (str.StartsWith ("$Version")) {
 273                                                         version = Int32.Parse (Unquote (str.Substring (str.IndexOf ('=') + 1)));
 274                                                 } else if (str.StartsWith ("$Path")) {
 275                                                         if (current != null)
 276                                                                 current.Path = str.Substring (str.IndexOf ('=') + 1).Trim ();
 277                                                 } else if (str.StartsWith ("$Domain")) {
 278                                                         if (current != null)
 279                                                                 current.Domain = str.Substring (str.IndexOf ('=') + 1).Trim ();
 280                                                 } else if (str.StartsWith ("$Port")) {
 281                                                         if (current != null)
 282                                                                 current.Port = str.Substring (str.IndexOf ('=') + 1).Trim ();
 283                                                 } else {
 284                                                         if (current != null) {
 285                                                                 cookies.Add (current);
 286                                                         }
 287                                                         current = new Cookie ();
 288                                                         int idx = str.IndexOf ('=');
 289                                                         if (idx > 0) {
 290                                                                 current.Name = str.Substring (0, idx).Trim ();
 291                                                                 current.Value =  str.Substring (idx + 1).Trim ();
 292                                                         } else {
 293                                                                 current.Name = str.Trim ();
 294                                                                 current.Value = String.Empty;
 295                                                         }
 296                                                         current.Version = version;
 297                                                 }
 298                                         }
 299                                         if (current != null) {
 300                                                 cookies.Add (current);
 301                                         }
 302                                         break;
 303                         }
 304                 }
 305
 306                 // returns true is the stream could be reused.
 307                 internal bool FlushInput ()
 308                 {
 309                         if (!HasEntityBody)
 310                                 return true;
 311
 312                         int length = 2048;
 313                         if (content_length > 0)
 314                                 length = (int) Math.Min (content_length, (long) length);
 315
 316                         byte [] bytes = new byte [length];
 317                         while (true) {
 318                                 // TODO: test if MS has a timeout when doing this
 319                                 try {
 320                                         IAsyncResult ares = InputStream.BeginRead (bytes, 0, length, null, null);
 321                                         if (!ares.IsCompleted && !ares.AsyncWaitHandle.WaitOne (1000))
 322                                                 return false;
 323                                         if (InputStream.EndRead (ares) <= 0)
 324                                                 return true;
 325                                 } catch (ObjectDisposedException e) {
 326                                         input_stream = null;
 327                                         return true;
 328                                 } catch {
 329                                         return false;
 330                                 }
 331                         }
 332                 }
 333
 334                 public string [] AcceptTypes {
 335                         get { return accept_types; }
 336                 }
 337
 338                 public int ClientCertificateError {
 339                         get {
 340                                 HttpConnection cnc = context.Connection;
 341                                 if (cnc.ClientCertificate == null)
 342                                         throw new InvalidOperationException ("No client certificate");
 343                                 int [] errors = cnc.ClientCertificateErrors;
 344                                 if (errors != null && errors.Length > 0)
 345                                         return errors [0];
 346                                 return 0;
 347                         }
 348                 }
 349
 350                 public Encoding ContentEncoding {
 351                         get {
 352                                 if (content_encoding == null)
 353                                         content_encoding = Encoding.Default;
 354                                 return content_encoding;
 355                         }
 356                 }
 357
 358                 public long ContentLength64 {
 359                         get { return content_length; }
 360                 }
 361
 362                 public string ContentType {
 363                         get { return headers ["content-type"]; }
 364                 }
 365
 366                 public CookieCollection Cookies {
 367                         get {
 368                                 // TODO: check if the collection is read-only
 369                                 if (cookies == null)
 370                                         cookies = new CookieCollection ();
 371                                 return cookies;
 372                         }
 373                 }
 374
 375                 public bool HasEntityBody {
 376                         get { return (content_length > 0 || is_chunked); }
 377                 }
 378
 379                 public NameValueCollection Headers {
 380                         get { return headers; }
 381                 }
 382
 383                 public string HttpMethod {
 384                         get { return method; }
 385                 }
 386
 387                 public Stream InputStream {
 388                         get {
 389                                 if (input_stream == null) {
 390                                         if (is_chunked || content_length > 0)
 391                                                 input_stream = context.Connection.GetRequestStream (is_chunked, content_length);
 392                                         else
 393                                                 input_stream = Stream.Null;
 394                                 }
 395
 396                                 return input_stream;
 397                         }
 398                 }
 399
 400                 [MonoTODO ("Always returns false")]
 401                 public bool IsAuthenticated {
 402                         get { return false; }
 403                 }
 404
 405                 public bool IsLocal {
 406                         get { return IPAddress.IsLoopback (RemoteEndPoint.Address); }
 407                 }
 408
 409                 public bool IsSecureConnection {
 410                         get { return context.Connection.IsSecure; }
 411                 }
 412
 413                 public bool KeepAlive {
 414                         get {
 415                                 if (ka_set)
 416                                         return keep_alive;
 417
 418                                 ka_set = true;
 419                                 // 1. Connection header
 420                                 // 2. Protocol (1.1 == keep-alive by default)
 421                                 // 3. Keep-Alive header
 422                                 string cnc = headers ["Connection"];
 423                                 if (!String.IsNullOrEmpty (cnc)) {
 424                                         keep_alive = (0 == String.Compare (cnc, "keep-alive", StringComparison.OrdinalIgnoreCase));
 425                                 } else if (version == HttpVersion.Version11) {
 426                                         keep_alive = true;
 427                                 } else {
 428                                         cnc = headers ["keep-alive"];
 429                                         if (!String.IsNullOrEmpty (cnc))
 430                                                 keep_alive = (0 != String.Compare (cnc, "closed", StringComparison.OrdinalIgnoreCase));
 431                                 }
 432                                 return keep_alive;
 433                         }
 434                 }
 435
 436                 public IPEndPoint LocalEndPoint {
 437                         get { return context.Connection.LocalEndPoint; }
 438                 }
 439
 440                 public Version ProtocolVersion {
 441                         get { return version; }
 442                 }
 443
 444                 public NameValueCollection QueryString {
 445                         get { return query_string; }
 446                 }
 447
 448                 public string RawUrl {
 449                         get { return raw_url; }
 450                 }
 451
 452                 public IPEndPoint RemoteEndPoint {
 453                         get { return context.Connection.RemoteEndPoint; }
 454                 }
 455
 456                 [MonoTODO ("Always returns Guid.Empty")]
 457                 public Guid RequestTraceIdentifier {
 458                         get { return Guid.Empty; }
 459                 }
 460
 461                 public Uri Url {
 462                         get { return url; }
 463                 }
 464
 465                 public Uri UrlReferrer {
 466                         get { return referrer; }
 467                 }
 468
 469                 public string UserAgent {
 470                         get { return headers ["user-agent"]; }
 471                 }
 472
 473                 public string UserHostAddress {
 474                         get { return LocalEndPoint.ToString (); }
 475                 }
 476
 477                 public string UserHostName {
 478                         get { return headers ["host"]; }
 479                 }
 480
 481                 public string [] UserLanguages {
 482                         get { return user_languages; }
 483                 }
 484
 485                 public IAsyncResult BeginGetClientCertificate (AsyncCallback requestCallback, object state)
 486                 {
 487                         if (gcc_delegate == null)
 488                                 gcc_delegate = new GCCDelegate (GetClientCertificate);
 489                         return gcc_delegate.BeginInvoke (requestCallback, state);
 490                 }
 491
 492                 public X509Certificate2 EndGetClientCertificate (IAsyncResult asyncResult)
 493                 {
 494                         if (asyncResult == null)
 495                                 throw new ArgumentNullException ("asyncResult");
 496
 497                         if (gcc_delegate == null)
 498                                 throw new InvalidOperationException ();
 499
 500                         return gcc_delegate.EndInvoke (asyncResult);
 501                 }
 502
 503                 public X509Certificate2 GetClientCertificate ()
 504                 {
 505                         return context.Connection.ClientCertificate;
 506                 }
 507
 508                 [MonoTODO]
 509                 public string ServiceName {
 510                         get {
 511                                 return null;
 512                         }
 513                 }
 514
 515                 public TransportContext TransportContext {
 516                         get {
 517                                 return new Context ();
 518                         }
 519                 }
 520
 521                 [MonoTODO]
 522                 public bool IsWebSocketRequest {
 523                         get {
 524                                 return false;
 525                         }
 526                 }
 527
 528                 public Task<X509Certificate2> GetClientCertificateAsync ()
 529                 {
 530                         return Task<X509Certificate2>.Factory.FromAsync (BeginGetClientCertificate, EndGetClientCertificate, null);
 531                 }
 532         }
 533 }
 534 #endif
 535