mcs/class/System/System.Net/ServicePointManager.cs

   1 //
   2 // System.Net.ServicePointManager
   3 //
   4 // Authors:
   5 //   Lawrence Pit (loz@cable.a2000.nl)
   6 //   Gonzalo Paniagua Javier (gonzalo@novell.com)
   7 //
   8 // Copyright (c) 2003-2010 Novell, Inc (http://www.novell.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.Threading;
  34 using System.Collections;
  35 using System.Collections.Generic;
  36 using System.Collections.Specialized;
  37 using System.Configuration;
  38 using System.Net.Configuration;
  39 using System.Security.Cryptography.X509Certificates;
  40
  41 using System.Globalization;
  42 using System.Net.Security;
  43 using System.Diagnostics;
  44
  45 //
  46 // notes:
  47 // A service point manager manages service points (duh!).
  48 // A service point maintains a list of connections (per scheme + authority).
  49 // According to HttpWebRequest.ConnectionGroupName each connection group
  50 // creates additional connections. therefor, a service point has a hashtable
  51 // of connection groups where each value is a list of connections.
  52 //
  53 // when we need to make an HttpWebRequest, we need to do the following:
  54 // 1. find service point, given Uri and Proxy
  55 // 2. find connection group, given service point and group name
  56 // 3. find free connection in connection group, or create one (if ok due to limits)
  57 // 4. lease connection
  58 // 5. execute request
  59 // 6. when finished, return connection
  60 //
  61
  62
  63 namespace System.Net
  64 {
  65         public partial class ServicePointManager {
  66                 class SPKey {
  67                         Uri uri; // schema/host/port
  68                         Uri proxy;
  69                         bool use_connect;
  70
  71                         public SPKey (Uri uri, Uri proxy, bool use_connect) {
  72                                 this.uri = uri;
  73                                 this.proxy = proxy;
  74                                 this.use_connect = use_connect;
  75                         }
  76
  77                         public Uri Uri {
  78                                 get { return uri; }
  79                         }
  80
  81                         public bool UseConnect {
  82                                 get { return use_connect; }
  83                         }
  84
  85                         public bool UsesProxy {
  86                                 get { return proxy != null; }
  87                         }
  88
  89                         public override int GetHashCode () {
  90                                 int hash = 23;
  91                                 hash = hash * 31 + ((use_connect) ? 1 : 0);
  92                                 hash = hash * 31 + uri.GetHashCode ();
  93                                 hash = hash * 31 + (proxy != null ? proxy.GetHashCode () : 0);
  94                                 return hash;
  95                         }
  96
  97                         public override bool Equals (object obj) {
  98                                 SPKey other = obj as SPKey;
  99                                 if (obj == null) {
 100                                         return false;
 101                                 }
 102
 103                                 if (!uri.Equals (other.uri))
 104                                         return false;
 105                                 if (use_connect != other.use_connect || UsesProxy != other.UsesProxy)
 106                                         return false;
 107                                 if (UsesProxy && !proxy.Equals (other.proxy))
 108                                         return false;
 109                                 return true;
 110                         }
 111                 }
 112
 113                 private static HybridDictionary servicePoints = new HybridDictionary ();
 114
 115                 // Static properties
 116
 117                 private static ICertificatePolicy policy;
 118                 private static int defaultConnectionLimit = DefaultPersistentConnectionLimit;
 119                 private static int maxServicePointIdleTime = 100000; // 100 seconds
 120                 private static int maxServicePoints = 0;
 121                 private static int dnsRefreshTimeout = 2 * 60 * 1000;
 122                 private static bool _checkCRL = false;
 123                 private static SecurityProtocolType _securityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
 124
 125                 static bool expectContinue = true;
 126                 static bool useNagle;
 127                 static ServerCertValidationCallback server_cert_cb;
 128                 static bool tcp_keepalive;
 129                 static int tcp_keepalive_time;
 130                 static int tcp_keepalive_interval;
 131
 132                 // Fields
 133
 134                 public const int DefaultNonPersistentConnectionLimit = 4;
 135 #if MONOTOUCH
 136                 public const int DefaultPersistentConnectionLimit = 10;
 137 #else
 138                 public const int DefaultPersistentConnectionLimit = 2;
 139 #endif
 140
 141 #if !NET_2_1
 142                 const string configKey = "system.net/connectionManagement";
 143                 static ConnectionManagementData manager;
 144 #endif
 145
 146                 static ServicePointManager ()
 147                 {
 148 #if !NET_2_1
 149 #if CONFIGURATION_DEP
 150                         object cfg = ConfigurationManager.GetSection (configKey);
 151                         ConnectionManagementSection s = cfg as ConnectionManagementSection;
 152                         if (s != null) {
 153                                 manager = new ConnectionManagementData (null);
 154                                 foreach (ConnectionManagementElement e in s.ConnectionManagement)
 155                                         manager.Add (e.Address, e.MaxConnection);
 156
 157                                 defaultConnectionLimit = (int) manager.GetMaxConnections ("*");
 158                                 return;
 159                         }
 160 #endif
 161                         manager = (ConnectionManagementData) ConfigurationSettings.GetConfig (configKey);
 162                         if (manager != null) {
 163                                 defaultConnectionLimit = (int) manager.GetMaxConnections ("*");
 164                         }
 165 #endif
 166                 }
 167
 168                 // Constructors
 169                 private ServicePointManager ()
 170                 {
 171                 }
 172
 173                 // Properties
 174
 175                 [Obsolete ("Use ServerCertificateValidationCallback instead", false)]
 176                 public static ICertificatePolicy CertificatePolicy {
 177                         get {
 178                                 if (policy == null)
 179                                         Interlocked.CompareExchange (ref policy, new DefaultCertificatePolicy (), null);
 180                                 return policy;
 181                         }
 182                         set { policy = value; }
 183                 }
 184
 185                 internal static ICertificatePolicy GetLegacyCertificatePolicy ()
 186                 {
 187                         return policy;
 188                 }
 189
 190                 [MonoTODO("CRL checks not implemented")]
 191                 public static bool CheckCertificateRevocationList {
 192                         get { return _checkCRL; }
 193                         set { _checkCRL = false; }      // TODO - don't yet accept true
 194                 }
 195
 196                 public static int DefaultConnectionLimit {
 197                         get { return defaultConnectionLimit; }
 198                         set {
 199                                 if (value <= 0)
 200                                         throw new ArgumentOutOfRangeException ("value");
 201
 202                                 defaultConnectionLimit = value;
 203 #if !NET_2_1
 204                 if (manager != null)
 205                                         manager.Add ("*", defaultConnectionLimit);
 206 #endif
 207                         }
 208                 }
 209
 210                 static Exception GetMustImplement ()
 211                 {
 212                         return new NotImplementedException ();
 213                 }
 214
 215                 public static int DnsRefreshTimeout
 216                 {
 217                         get {
 218                                 return dnsRefreshTimeout;
 219                         }
 220                         set {
 221                                 dnsRefreshTimeout = Math.Max (-1, value);
 222                         }
 223                 }
 224
 225                 [MonoTODO]
 226                 public static bool EnableDnsRoundRobin
 227                 {
 228                         get {
 229                                 throw GetMustImplement ();
 230                         }
 231                         set {
 232                                 throw GetMustImplement ();
 233                         }
 234                 }
 235
 236                 public static int MaxServicePointIdleTime {
 237                         get {
 238                                 return maxServicePointIdleTime;
 239                         }
 240                         set {
 241                                 if (value < -2 || value > Int32.MaxValue)
 242                                         throw new ArgumentOutOfRangeException ("value");
 243                                 maxServicePointIdleTime = value;
 244                         }
 245                 }
 246
 247                 public static int MaxServicePoints {
 248                         get {
 249                                 return maxServicePoints;
 250                         }
 251                         set {
 252                                 if (value < 0)
 253                                         throw new ArgumentException ("value");
 254
 255                                 maxServicePoints = value;
 256                         }
 257                 }
 258
 259                 public static SecurityProtocolType SecurityProtocol {
 260                         get { return _securityProtocol; }
 261                         set { _securityProtocol = value; }
 262                 }
 263
 264                 internal static ServerCertValidationCallback ServerCertValidationCallback {
 265                         get { return server_cert_cb; }
 266                 }
 267
 268                 public static RemoteCertificateValidationCallback ServerCertificateValidationCallback {
 269                         get {
 270                                 if (server_cert_cb == null)
 271                                         return null;
 272                                 return server_cert_cb.ValidationCallback;
 273                         }
 274                         set
 275                         {
 276                                 if (value == null)
 277                                         server_cert_cb = null;
 278                                 else
 279                                         server_cert_cb = new ServerCertValidationCallback (value);
 280                         }
 281                 }
 282
 283                 public static bool Expect100Continue {
 284                         get { return expectContinue; }
 285                         set { expectContinue = value; }
 286                 }
 287
 288                 public static bool UseNagleAlgorithm {
 289                         get { return useNagle; }
 290                         set { useNagle = value; }
 291                 }
 292
 293                 internal static bool DisableStrongCrypto {
 294                         get { return false; }
 295                 }
 296
 297                 // Methods
 298                 public static void SetTcpKeepAlive (bool enabled, int keepAliveTime, int keepAliveInterval)
 299                 {
 300                         if (enabled) {
 301                                 if (keepAliveTime <= 0)
 302                                         throw new ArgumentOutOfRangeException ("keepAliveTime", "Must be greater than 0");
 303                                 if (keepAliveInterval <= 0)
 304                                         throw new ArgumentOutOfRangeException ("keepAliveInterval", "Must be greater than 0");
 305                         }
 306
 307                         tcp_keepalive = enabled;
 308                         tcp_keepalive_time = keepAliveTime;
 309                         tcp_keepalive_interval = keepAliveInterval;
 310                 }
 311
 312                 public static ServicePoint FindServicePoint (Uri address)
 313                 {
 314                         return FindServicePoint (address, null);
 315                 }
 316
 317                 public static ServicePoint FindServicePoint (string uriString, IWebProxy proxy)
 318                 {
 319                         return FindServicePoint (new Uri(uriString), proxy);
 320                 }
 321
 322                 public static ServicePoint FindServicePoint (Uri address, IWebProxy proxy)
 323                 {
 324                         if (address == null)
 325                                 throw new ArgumentNullException ("address");
 326
 327                         var origAddress = new Uri (address.Scheme + "://" + address.Authority);
 328
 329                         bool usesProxy = false;
 330                         bool useConnect = false;
 331                         if (proxy != null && !proxy.IsBypassed(address)) {
 332                                 usesProxy = true;
 333                                 bool isSecure = address.Scheme == "https";
 334                                 address = proxy.GetProxy (address);
 335                                 if (address.Scheme != "http")
 336                                         throw new NotSupportedException ("Proxy scheme not supported.");
 337
 338                                 if (isSecure && address.Scheme == "http")
 339                                         useConnect = true;
 340                         }
 341
 342                         address = new Uri (address.Scheme + "://" + address.Authority);
 343
 344                         ServicePoint sp = null;
 345                         SPKey key = new SPKey (origAddress, usesProxy ? address : null, useConnect);
 346                         lock (servicePoints) {
 347                                 sp = servicePoints [key] as ServicePoint;
 348                                 if (sp != null)
 349                                         return sp;
 350
 351                                 if (maxServicePoints > 0 && servicePoints.Count >= maxServicePoints)
 352                                         throw new InvalidOperationException ("maximum number of service points reached");
 353
 354                                 int limit;
 355 #if NET_2_1
 356                                 limit = defaultConnectionLimit;
 357 #else
 358                                 string addr = address.ToString ();
 359                                 limit = (int) manager.GetMaxConnections (addr);
 360 #endif
 361                                 sp = new ServicePoint (address, limit, maxServicePointIdleTime);
 362                                 sp.Expect100Continue = expectContinue;
 363                                 sp.UseNagleAlgorithm = useNagle;
 364                                 sp.UsesProxy = usesProxy;
 365                                 sp.UseConnect = useConnect;
 366                                 sp.SetTcpKeepAlive (tcp_keepalive, tcp_keepalive_time, tcp_keepalive_interval);
 367                                 servicePoints.Add (key, sp);
 368                         }
 369
 370                         return sp;
 371                 }
 372
 373                 internal static void CloseConnectionGroup (string connectionGroupName)
 374                 {
 375                         lock (servicePoints) {
 376                                 foreach (ServicePoint sp in servicePoints.Values) {
 377                                         sp.CloseConnectionGroup (connectionGroupName);
 378                                 }
 379                         }
 380                 }
 381         }
 382 }
 383