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                 static bool MaybeUri (string s)
 150                 {
 151                         int p = s.IndexOf (':');
 152                         if (p == -1)
 153                                 return false;
 154
 155                         if (p >= 10)
 156                                 return false;
 157
 158                         return IsPredefinedScheme (s.Substring (0, p));
 159                 }
 160
 161                 //
 162                 // Using a simple block of if's is twice as slow as the compiler generated
 163                 // switch statement.   But using this tuned code is faster than the
 164                 // compiler generated code, with a million loops on x86-64:
 165                 //
 166                 // With "http": .10 vs .51 (first check)
 167                 // with "https": .16 vs .51 (second check)
 168                 // with "foo": .22 vs .31 (never found)
 169                 // with "mailto": .12 vs .51  (last check)
 170                 //
 171                 //
 172                 static bool IsPredefinedScheme (string scheme)
 173                 {
 174                         if (scheme == null || scheme.Length < 3)
 175                                 return false;
 176
 177                         char c = scheme [0];
 178                         if (c == 'h')
 179                                 return (scheme == "http" || scheme == "https");
 180                         if (c == 'f')
 181                                 return (scheme == "file" || scheme == "ftp");
 182
 183                         if (c == 'n'){
 184                                 c = scheme [1];
 185                                 if (c == 'e')
 186                                         return (scheme == "news" || scheme == "net.pipe" || scheme == "net.tcp");
 187                                 if (scheme == "nntp")
 188                                         return true;
 189                                 return false;
 190                         }
 191                         if ((c == 'g' && scheme == "gopher") || (c == 'm' && scheme == "mailto"))
 192                                 return true;
 193
 194                         return false;
 195                 }
 196
 197                 internal void FinishInitialization ()
 198                 {
 199                         string host = UserHostName;
 200                         if (version > HttpVersion.Version10 && (host == null || host.Length == 0)) {
 201                                 context.ErrorMessage = "Invalid host name";
 202                                 return;
 203                         }
 204
 205                         string path;
 206                         Uri raw_uri = null;
 207                         if (MaybeUri (raw_url.ToLowerInvariant ()) && Uri.TryCreate (raw_url, UriKind.Absolute, out raw_uri))
 208                                 path = raw_uri.PathAndQuery;
 209                         else
 210                                 path = raw_url;
 211
 212                         if ((host == null || host.Length == 0))
 213                                 host = UserHostAddress;
 214
 215                         if (raw_uri != null)
 216                                 host = raw_uri.Host;
 217
 218                         int colon = host.IndexOf (':');
 219                         if (colon >= 0)
 220                                 host = host.Substring (0, colon);
 221
 222                         string base_uri = String.Format ("{0}://{1}:{2}",
 223                                                                 (IsSecureConnection) ? "https" : "http",
 224                                                                 host, LocalEndPoint.Port);
 225
 226                         if (!Uri.TryCreate (base_uri + path, UriKind.Absolute, out url)){
 227                                 context.ErrorMessage = WebUtility.HtmlEncode ("Invalid url: " + base_uri + path);
 228                                 return;
 229                         }
 230
 231                         CreateQueryString (url.Query);
 232
 233                         // Use reference source HttpListenerRequestUriBuilder to process url.
 234                         // Fixes #29927
 235                         url = HttpListenerRequestUriBuilder.GetRequestUri (raw_url, url.Scheme,
 236                                                                 url.Authority, url.LocalPath, url.Query);
 237
 238                         if (version >= HttpVersion.Version11) {
 239                                 string t_encoding = Headers ["Transfer-Encoding"];
 240                                 is_chunked = (t_encoding != null && String.Compare (t_encoding, "chunked", StringComparison.OrdinalIgnoreCase) == 0);
 241                                 // 'identity' is not valid!
 242                                 if (t_encoding != null && !is_chunked) {
 243                                         context.Connection.SendError (null, 501);
 244                                         return;
 245                                 }
 246                         }
 247
 248                         if (!is_chunked && !cl_set) {
 249                                 if (String.Compare (method, "POST", StringComparison.OrdinalIgnoreCase) == 0 ||
 250                                     String.Compare (method, "PUT", StringComparison.OrdinalIgnoreCase) == 0) {
 251                                         context.Connection.SendError (null, 411);
 252                                         return;
 253                                 }
 254                         }
 255
 256                         if (String.Compare (Headers ["Expect"], "100-continue", StringComparison.OrdinalIgnoreCase) == 0) {
 257                                 ResponseStream output = context.Connection.GetResponseStream ();
 258                                 output.InternalWrite (_100continue, 0, _100continue.Length);
 259                         }
 260                 }
 261
 262                 internal static string Unquote (String str) {
 263                         int start = str.IndexOf ('\"');
 264                         int end = str.LastIndexOf ('\"');
 265                         if (start >= 0 && end >=0)
 266                                 str = str.Substring (start + 1, end - 1);
 267                         return str.Trim ();
 268                 }
 269
 270                 internal void AddHeader (string header)
 271                 {
 272                         int colon = header.IndexOf (':');
 273                         if (colon == -1 || colon == 0) {
 274                                 context.ErrorMessage = "Bad Request";
 275                                 context.ErrorStatus = 400;
 276                                 return;
 277                         }
 278
 279                         string name = header.Substring (0, colon).Trim ();
 280                         string val = header.Substring (colon + 1).Trim ();
 281                         string lower = name.ToLower (CultureInfo.InvariantCulture);
 282                         headers.SetInternal (name, val);
 283                         switch (lower) {
 284                                 case "accept-language":
 285                                         user_languages = val.Split (','); // yes, only split with a ','
 286                                         break;
 287                                 case "accept":
 288                                         accept_types = val.Split (','); // yes, only split with a ','
 289                                         break;
 290                                 case "content-length":
 291                                         try {
 292                                                 //TODO: max. content_length?
 293                                                 content_length = Int64.Parse (val.Trim ());
 294                                                 if (content_length < 0)
 295                                                         context.ErrorMessage = "Invalid Content-Length.";
 296                                                 cl_set = true;
 297                                         } catch {
 298                                                 context.ErrorMessage = "Invalid Content-Length.";
 299                                         }
 300
 301                                         break;
 302                                 case "referer":
 303                                         try {
 304                                                 referrer = new Uri (val);
 305                                         } catch {
 306                                                 referrer = new Uri ("http://someone.is.screwing.with.the.headers.com/");
 307                                         }
 308                                         break;
 309                                 case "cookie":
 310                                         if (cookies == null)
 311                                                 cookies = new CookieCollection();
 312
 313                                         string[] cookieStrings = val.Split(new char[] {',', ';'});
 314                                         Cookie current = null;
 315                                         int version = 0;
 316                                         foreach (string cookieString in cookieStrings) {
 317                                                 string str = cookieString.Trim ();
 318                                                 if (str.Length == 0)
 319                                                         continue;
 320                                                 if (str.StartsWith ("$Version")) {
 321                                                         version = Int32.Parse (Unquote (str.Substring (str.IndexOf ('=') + 1)));
 322                                                 } else if (str.StartsWith ("$Path")) {
 323                                                         if (current != null)
 324                                                                 current.Path = str.Substring (str.IndexOf ('=') + 1).Trim ();
 325                                                 } else if (str.StartsWith ("$Domain")) {
 326                                                         if (current != null)
 327                                                                 current.Domain = str.Substring (str.IndexOf ('=') + 1).Trim ();
 328                                                 } else if (str.StartsWith ("$Port")) {
 329                                                         if (current != null)
 330                                                                 current.Port = str.Substring (str.IndexOf ('=') + 1).Trim ();
 331                                                 } else {
 332                                                         if (current != null) {
 333                                                                 cookies.Add (current);
 334                                                         }
 335                                                         current = new Cookie ();
 336                                                         int idx = str.IndexOf ('=');
 337                                                         if (idx > 0) {
 338                                                                 current.Name = str.Substring (0, idx).Trim ();
 339                                                                 current.Value =  str.Substring (idx + 1).Trim ();
 340                                                         } else {
 341                                                                 current.Name = str.Trim ();
 342                                                                 current.Value = String.Empty;
 343                                                         }
 344                                                         current.Version = version;
 345                                                 }
 346                                         }
 347                                         if (current != null) {
 348                                                 cookies.Add (current);
 349                                         }
 350                                         break;
 351                         }
 352                 }
 353
 354                 // returns true is the stream could be reused.
 355                 internal bool FlushInput ()
 356                 {
 357                         if (!HasEntityBody)
 358                                 return true;
 359
 360                         int length = 2048;
 361                         if (content_length > 0)
 362                                 length = (int) Math.Min (content_length, (long) length);
 363
 364                         byte [] bytes = new byte [length];
 365                         while (true) {
 366                                 // TODO: test if MS has a timeout when doing this
 367                                 try {
 368                                         IAsyncResult ares = InputStream.BeginRead (bytes, 0, length, null, null);
 369                                         if (!ares.IsCompleted && !ares.AsyncWaitHandle.WaitOne (1000))
 370                                                 return false;
 371                                         if (InputStream.EndRead (ares) <= 0)
 372                                                 return true;
 373                                 } catch (ObjectDisposedException) {
 374                                         input_stream = null;
 375                                         return true;
 376                                 } catch {
 377                                         return false;
 378                                 }
 379                         }
 380                 }
 381
 382                 public string [] AcceptTypes {
 383                         get { return accept_types; }
 384                 }
 385
 386                 public int ClientCertificateError {
 387                         get {
 388                                 HttpConnection cnc = context.Connection;
 389                                 if (cnc.ClientCertificate == null)
 390                                         throw new InvalidOperationException ("No client certificate");
 391                                 int [] errors = cnc.ClientCertificateErrors;
 392                                 if (errors != null && errors.Length > 0)
 393                                         return errors [0];
 394                                 return 0;
 395                         }
 396                 }
 397
 398                 public Encoding ContentEncoding {
 399                         get {
 400                                 if (content_encoding == null)
 401                                         content_encoding = Encoding.Default;
 402                                 return content_encoding;
 403                         }
 404                 }
 405
 406                 public long ContentLength64 {
 407                         get { return content_length; }
 408                 }
 409
 410                 public string ContentType {
 411                         get { return headers ["content-type"]; }
 412                 }
 413
 414                 public CookieCollection Cookies {
 415                         get {
 416                                 // TODO: check if the collection is read-only
 417                                 if (cookies == null)
 418                                         cookies = new CookieCollection ();
 419                                 return cookies;
 420                         }
 421                 }
 422
 423                 public bool HasEntityBody {
 424                         get { return (content_length > 0 || is_chunked); }
 425                 }
 426
 427                 public NameValueCollection Headers {
 428                         get { return headers; }
 429                 }
 430
 431                 public string HttpMethod {
 432                         get { return method; }
 433                 }
 434
 435                 public Stream InputStream {
 436                         get {
 437                                 if (input_stream == null) {
 438                                         if (is_chunked || content_length > 0)
 439                                                 input_stream = context.Connection.GetRequestStream (is_chunked, content_length);
 440                                         else
 441                                                 input_stream = Stream.Null;
 442                                 }
 443
 444                                 return input_stream;
 445                         }
 446                 }
 447
 448                 [MonoTODO ("Always returns false")]
 449                 public bool IsAuthenticated {
 450                         get { return false; }
 451                 }
 452
 453                 public bool IsLocal {
 454                         get { return LocalEndPoint.Address.Equals (RemoteEndPoint.Address); }
 455                 }
 456
 457                 public bool IsSecureConnection {
 458                         get { return context.Connection.IsSecure; }
 459                 }
 460
 461                 public bool KeepAlive {
 462                         get {
 463                                 if (ka_set)
 464                                         return keep_alive;
 465
 466                                 ka_set = true;
 467                                 // 1. Connection header
 468                                 // 2. Protocol (1.1 == keep-alive by default)
 469                                 // 3. Keep-Alive header
 470                                 string cnc = headers ["Connection"];
 471                                 if (!String.IsNullOrEmpty (cnc)) {
 472                                         keep_alive = (0 == String.Compare (cnc, "keep-alive", StringComparison.OrdinalIgnoreCase));
 473                                 } else if (version == HttpVersion.Version11) {
 474                                         keep_alive = true;
 475                                 } else {
 476                                         cnc = headers ["keep-alive"];
 477                                         if (!String.IsNullOrEmpty (cnc))
 478                                                 keep_alive = (0 != String.Compare (cnc, "closed", StringComparison.OrdinalIgnoreCase));
 479                                 }
 480                                 return keep_alive;
 481                         }
 482                 }
 483
 484                 public IPEndPoint LocalEndPoint {
 485                         get { return context.Connection.LocalEndPoint; }
 486                 }
 487
 488                 public Version ProtocolVersion {
 489                         get { return version; }
 490                 }
 491
 492                 public NameValueCollection QueryString {
 493                         get { return query_string; }
 494                 }
 495
 496                 public string RawUrl {
 497                         get { return raw_url; }
 498                 }
 499
 500                 public IPEndPoint RemoteEndPoint {
 501                         get { return context.Connection.RemoteEndPoint; }
 502                 }
 503
 504                 [MonoTODO ("Always returns Guid.Empty")]
 505                 public Guid RequestTraceIdentifier {
 506                         get { return Guid.Empty; }
 507                 }
 508
 509                 public Uri Url {
 510                         get { return url; }
 511                 }
 512
 513                 public Uri UrlReferrer {
 514                         get { return referrer; }
 515                 }
 516
 517                 public string UserAgent {
 518                         get { return headers ["user-agent"]; }
 519                 }
 520
 521                 public string UserHostAddress {
 522                         get { return LocalEndPoint.ToString (); }
 523                 }
 524
 525                 public string UserHostName {
 526                         get { return headers ["host"]; }
 527                 }
 528
 529                 public string [] UserLanguages {
 530                         get { return user_languages; }
 531                 }
 532
 533                 public IAsyncResult BeginGetClientCertificate (AsyncCallback requestCallback, object state)
 534                 {
 535                         if (gcc_delegate == null)
 536                                 gcc_delegate = new GCCDelegate (GetClientCertificate);
 537                         return gcc_delegate.BeginInvoke (requestCallback, state);
 538                 }
 539
 540                 public X509Certificate2 EndGetClientCertificate (IAsyncResult asyncResult)
 541                 {
 542                         if (asyncResult == null)
 543                                 throw new ArgumentNullException ("asyncResult");
 544
 545                         if (gcc_delegate == null)
 546                                 throw new InvalidOperationException ();
 547
 548                         return gcc_delegate.EndInvoke (asyncResult);
 549                 }
 550
 551                 public X509Certificate2 GetClientCertificate ()
 552                 {
 553                         return context.Connection.ClientCertificate;
 554                 }
 555
 556                 [MonoTODO]
 557                 public string ServiceName {
 558                         get {
 559                                 return null;
 560                         }
 561                 }
 562
 563                 public TransportContext TransportContext {
 564                         get {
 565                                 return new Context ();
 566                         }
 567                 }
 568
 569                 [MonoTODO]
 570                 public bool IsWebSocketRequest {
 571                         get {
 572                                 return false;
 573                         }
 574                 }
 575
 576                 public Task<X509Certificate2> GetClientCertificateAsync ()
 577                 {
 578                         return Task<X509Certificate2>.Factory.FromAsync (BeginGetClientCertificate, EndGetClientCertificate, null);
 579                 }
 580         }
 581 }
 582 #endif
 583