mcs/class/System/System.Net/ServicePoint.cs

   1 //
   2 // System.Net.ServicePoint
   3 //
   4 // Authors:
   5 //      Lawrence Pit (loz@cable.a2000.nl)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //
   8 // (c) 2002 Lawrence Pit
   9 // (c) 2003 Ximian, Inc. (http://www.ximian.com)
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Collections;
  35 using System.Net.Sockets;
  36 using System.Security.Cryptography.X509Certificates;
  37 using System.Threading;
  38
  39 namespace System.Net
  40 {
  41         public class ServicePoint
  42         {
  43                 Uri uri;
  44                 int connectionLimit;
  45                 int maxIdleTime;
  46                 int currentConnections;
  47                 DateTime idleSince;
  48                 Version protocolVersion;
  49                 X509Certificate certificate;
  50                 X509Certificate clientCertificate;
  51                 IPHostEntry host;
  52                 bool usesProxy;
  53                 Hashtable groups;
  54                 bool sendContinue = true;
  55                 bool useConnect;
  56                 object locker = new object ();
  57                 object hostE = new object ();
  58                 bool useNagle;
  59                 BindIPEndPoint endPointCallback = null;
  60                 bool tcp_keepalive;
  61                 int tcp_keepalive_time;
  62                 int tcp_keepalive_interval;
  63
  64                 // Constructors
  65
  66                 internal ServicePoint (Uri uri, int connectionLimit, int maxIdleTime)
  67                 {
  68                         this.uri = uri;
  69                         this.connectionLimit = connectionLimit;
  70                         this.maxIdleTime = maxIdleTime;
  71                         this.currentConnections = 0;
  72                         this.idleSince = DateTime.UtcNow;
  73                 }
  74
  75                 // Properties
  76
  77                 public Uri Address {
  78                         get { return uri; }
  79                 }
  80
  81                 static Exception GetMustImplement ()
  82                 {
  83                         return new NotImplementedException ();
  84                 }
  85
  86                 public BindIPEndPoint BindIPEndPointDelegate
  87                 {
  88                         get { return endPointCallback; }
  89                         set { endPointCallback = value; }
  90                 }
  91
  92                 public X509Certificate Certificate {
  93                         get { return certificate; }
  94                 }
  95
  96                 public X509Certificate ClientCertificate {
  97                         get { return clientCertificate; }
  98                 }
  99
 100                 [MonoTODO]
 101                 public int ConnectionLeaseTimeout
 102                 {
 103                         get {
 104                                 throw GetMustImplement ();
 105                         }
 106                         set {
 107                                 throw GetMustImplement ();
 108                         }
 109                 }
 110
 111                 public int ConnectionLimit {
 112                         get { return connectionLimit; }
 113                         set {
 114                                 if (value <= 0)
 115                                         throw new ArgumentOutOfRangeException ();
 116
 117                                 connectionLimit = value;
 118                         }
 119                 }
 120
 121                 public string ConnectionName {
 122                         get { return uri.Scheme; }
 123                 }
 124
 125                 public int CurrentConnections {
 126                         get {
 127                                 return currentConnections;
 128                         }
 129                 }
 130
 131                 public DateTime IdleSince {
 132                         get {
 133                                 return idleSince.ToLocalTime ();
 134                         }
 135                         internal set {
 136                                 lock (locker)
 137                                         idleSince = value.ToUniversalTime ();
 138                         }
 139                 }
 140
 141                 public int MaxIdleTime {
 142                         get { return maxIdleTime; }
 143                         set {
 144                                 if (value < Timeout.Infinite || value > Int32.MaxValue)
 145                                         throw new ArgumentOutOfRangeException ();
 146                                 this.maxIdleTime = value;
 147                         }
 148                 }
 149
 150                 public virtual Version ProtocolVersion {
 151                         get { return protocolVersion; }
 152                 }
 153
 154                 [MonoTODO]
 155                 public int ReceiveBufferSize
 156                 {
 157                         get {
 158                                 throw GetMustImplement ();
 159                         }
 160                         set {
 161                                 throw GetMustImplement ();
 162                         }
 163                 }
 164
 165                 public bool SupportsPipelining {
 166                         get { return HttpVersion.Version11.Equals (protocolVersion); }
 167                 }
 168
 169
 170                 public bool Expect100Continue {
 171                         get { return SendContinue; }
 172                         set { SendContinue = value; }
 173                 }
 174
 175                 public bool UseNagleAlgorithm {
 176                         get { return useNagle; }
 177                         set { useNagle = value; }
 178                 }
 179
 180                 internal bool SendContinue {
 181                         get { return sendContinue &&
 182                                      (protocolVersion == null || protocolVersion == HttpVersion.Version11); }
 183                         set { sendContinue = value; }
 184                 }
 185                 // Methods
 186
 187                 public void SetTcpKeepAlive (bool enabled, int keepAliveTime, int keepAliveInterval)
 188                 {
 189                         if (enabled) {
 190                                 if (keepAliveTime <= 0)
 191                                         throw new ArgumentOutOfRangeException ("keepAliveTime", "Must be greater than 0");
 192                                 if (keepAliveInterval <= 0)
 193                                         throw new ArgumentOutOfRangeException ("keepAliveInterval", "Must be greater than 0");
 194                         }
 195
 196                         tcp_keepalive = enabled;
 197                         tcp_keepalive_time = keepAliveTime;
 198                         tcp_keepalive_interval = keepAliveInterval;
 199                 }
 200
 201                 internal void KeepAliveSetup (Socket socket)
 202                 {
 203                         if (!tcp_keepalive)
 204                                 return;
 205
 206                         byte [] bytes = new byte [12];
 207                         PutBytes (bytes, (uint) (tcp_keepalive ? 1 : 0), 0);
 208                         PutBytes (bytes, (uint) tcp_keepalive_time, 4);
 209                         PutBytes (bytes, (uint) tcp_keepalive_interval, 8);
 210                         socket.IOControl (IOControlCode.KeepAliveValues, bytes, null);
 211                 }
 212
 213                 static void PutBytes (byte [] bytes, uint v, int offset)
 214                 {
 215                         if (BitConverter.IsLittleEndian) {
 216                                 bytes [offset] = (byte) (v & 0x000000ff);
 217                                 bytes [offset + 1] = (byte) ((v & 0x0000ff00) >> 8);
 218                                 bytes [offset + 2] = (byte) ((v & 0x00ff0000) >> 16);
 219                                 bytes [offset + 3] = (byte) ((v & 0xff000000) >> 24);
 220                         } else {
 221                                 bytes [offset + 3] = (byte) (v & 0x000000ff);
 222                                 bytes [offset + 2] = (byte) ((v & 0x0000ff00) >> 8);
 223                                 bytes [offset + 1] = (byte) ((v & 0x00ff0000) >> 16);
 224                                 bytes [offset] = (byte) ((v & 0xff000000) >> 24);
 225                         }
 226                 }
 227
 228                 // Internal Methods
 229
 230                 internal bool UsesProxy {
 231                         get { return usesProxy; }
 232                         set { usesProxy = value; }
 233                 }
 234
 235                 internal bool UseConnect {
 236                         get { return useConnect; }
 237                         set { useConnect = value; }
 238                 }
 239
 240                 internal bool AvailableForRecycling {
 241                         get {
 242                                 return CurrentConnections == 0
 243                                     && maxIdleTime != Timeout.Infinite
 244                                     && DateTime.UtcNow >= IdleSince.AddMilliseconds (maxIdleTime);
 245                         }
 246                 }
 247
 248                 internal Hashtable Groups {
 249                         get {
 250                                 if (groups == null)
 251                                         groups = new Hashtable ();
 252
 253                                 return groups;
 254                         }
 255                 }
 256
 257                 internal IPHostEntry HostEntry
 258                 {
 259                         get {
 260                                 lock (hostE) {
 261                                         if (host != null)
 262                                                 return host;
 263
 264                                         string uriHost = uri.Host;
 265
 266                                         // There is no need to do DNS resolution on literal IP addresses
 267                                         if (uri.HostNameType == UriHostNameType.IPv6 ||
 268                                                 uri.HostNameType == UriHostNameType.IPv4) {
 269
 270                                                 if (uri.HostNameType == UriHostNameType.IPv6) {
 271                                                         // Remove square brackets
 272                                                         uriHost = uriHost.Substring(1,uriHost.Length-2);
 273                                                 }
 274
 275                                                 // Creates IPHostEntry
 276                                                 host = new IPHostEntry();
 277                                                 host.AddressList = new IPAddress[] { IPAddress.Parse(uriHost) };
 278
 279                                                 return host;
 280                                         }
 281
 282                                         // Try DNS resolution on host names
 283                                         try  {
 284                                                 host = Dns.GetHostByName (uriHost);
 285                                         }
 286                                         catch {
 287                                                 return null;
 288                                         }
 289                                 }
 290
 291                                 return host;
 292                         }
 293                 }
 294
 295                 internal void SetVersion (Version version)
 296                 {
 297                         protocolVersion = version;
 298                 }
 299
 300 #if !TARGET_JVM
 301                 WebConnectionGroup GetConnectionGroup (string name)
 302                 {
 303                         if (name == null)
 304                                 name = "";
 305
 306                         WebConnectionGroup group = Groups [name] as WebConnectionGroup;
 307                         if (group != null)
 308                                 return group;
 309
 310                         group = new WebConnectionGroup (this, name);
 311                         Groups [name] = group;
 312                         return group;
 313                 }
 314
 315                 internal EventHandler SendRequest (HttpWebRequest request, string groupName)
 316                 {
 317                         WebConnection cnc;
 318
 319                         lock (locker) {
 320                                 WebConnectionGroup cncGroup = GetConnectionGroup (groupName);
 321                                 cnc = cncGroup.GetConnection (request);
 322                         }
 323
 324                         return cnc.SendRequest (request);
 325                 }
 326 #endif
 327                 public bool CloseConnectionGroup (string connectionGroupName)
 328                 {
 329                         lock (locker) {
 330                                 WebConnectionGroup cncGroup = GetConnectionGroup (connectionGroupName);
 331                                 if (cncGroup != null) {
 332                                         cncGroup.Close ();
 333                                         return true;
 334                                 }
 335                         }
 336
 337                         return false;
 338                 }
 339
 340                 internal void IncrementConnection ()
 341                 {
 342                         lock (locker) {
 343                                 currentConnections++;
 344                                 idleSince = DateTime.UtcNow.AddMilliseconds (1000000);
 345                         }
 346                 }
 347
 348                 internal void DecrementConnection ()
 349                 {
 350                         lock (locker) {
 351                                 currentConnections--;
 352                                 if (currentConnections == 0)
 353                                         idleSince = DateTime.UtcNow;
 354                         }
 355                 }
 356
 357                 internal void SetCertificates (X509Certificate client, X509Certificate server)
 358                 {
 359                         certificate = server;
 360                         clientCertificate = client;
 361                 }
 362
 363                 internal bool CallEndPointDelegate (Socket sock, IPEndPoint remote)
 364                 {
 365                         if (endPointCallback == null)
 366                                 return true;
 367
 368                         int count = 0;
 369                         for (;;) {
 370                                 IPEndPoint local = null;
 371                                 try {
 372                                         local = endPointCallback (this,
 373                                                 remote, count);
 374                                 } catch {
 375                                         // This is to differentiate from an
 376                                         // OverflowException, which should propagate.
 377                                         return false;
 378                                 }
 379
 380                                 if (local == null)
 381                                         return true;
 382
 383                                 try {
 384                                         sock.Bind (local);
 385                                 } catch (SocketException) {
 386                                         // This is intentional; the docs say
 387                                         // that if the Bind fails, we keep
 388                                         // going until there is an
 389                                         // OverflowException on the retry
 390                                         // count.
 391                                         checked { ++count; }
 392                                         continue;
 393                                 }
 394
 395                                 return true;
 396                         }
 397                 }
 398         }
 399 }
 400
 401