mcs/class/System/System.Net/WebConnectionGroup.cs

   1 //
   2 // System.Net.WebConnectionGroup
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) 2003 Ximian, Inc (http://www.ximian.com)
   8 // Copyright 2011 Xamarin, Inc (http://www.xamarin.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.Collections;
  34 using System.Net.Configuration;
  35 using System.Net.Sockets;
  36
  37 namespace System.Net
  38 {
  39         class WebConnectionGroup
  40         {
  41                 ServicePoint sPoint;
  42                 string name;
  43                 ArrayList connections;
  44                 Random rnd;
  45                 Queue queue;
  46
  47                 public WebConnectionGroup (ServicePoint sPoint, string name)
  48                 {
  49                         this.sPoint = sPoint;
  50                         this.name = name;
  51                         connections = new ArrayList (1);
  52                         queue = new Queue ();
  53                 }
  54
  55                 public void Close ()
  56                 {
  57                         //TODO: what do we do with the queue? Empty it out and abort the requests?
  58                         //TODO: abort requests or wait for them to finish
  59                         lock (connections) {
  60                                 WeakReference cncRef = null;
  61
  62                                 int end = connections.Count;
  63                                 // ArrayList removed = null;
  64                                 for (int i = 0; i < end; i++) {
  65                                         cncRef = (WeakReference) connections [i];
  66                                         WebConnection cnc = cncRef.Target as WebConnection;
  67                                         if (cnc != null) {
  68                                                 cnc.Close (false);
  69                                         }
  70                                 }
  71                                 connections.Clear ();
  72                         }
  73                 }
  74
  75                 public WebConnection GetConnection (HttpWebRequest request)
  76                 {
  77                         WebConnection cnc = null;
  78                         lock (connections) {
  79                                 WeakReference cncRef = null;
  80
  81                                 // Remove disposed connections
  82                                 int end = connections.Count;
  83                                 ArrayList removed = null;
  84                                 for (int i = 0; i < end; i++) {
  85                                         cncRef = (WeakReference) connections [i];
  86                                         cnc = cncRef.Target as WebConnection;
  87                                         if (cnc == null) {
  88                                                 if (removed == null)
  89                                                         removed = new ArrayList (1);
  90
  91                                                 removed.Add (i);
  92                                         }
  93                                 }
  94
  95                                 if (removed != null) {
  96                                         for (int i = removed.Count - 1; i >= 0; i--)
  97                                                 connections.RemoveAt ((int) removed [i]);
  98                                 }
  99
 100                                 cnc = CreateOrReuseConnection (request);
 101                         }
 102
 103                         return cnc;
 104                 }
 105
 106                 static void PrepareSharingNtlm (WebConnection cnc, HttpWebRequest request)
 107                 {
 108                         if (!cnc.NtlmAuthenticated)
 109                                 return;
 110
 111                         bool needs_reset = false;
 112                         NetworkCredential cnc_cred = cnc.NtlmCredential;
 113
 114                         bool isProxy = (request.Proxy != null && !request.Proxy.IsBypassed (request.RequestUri));
 115                         ICredentials req_icreds = (!isProxy) ? request.Credentials : request.Proxy.Credentials;
 116                         NetworkCredential req_cred = (req_icreds != null) ? req_icreds.GetCredential (request.RequestUri, "NTLM") : null;
 117
 118                         if (cnc_cred == null || req_cred == null ||
 119                                 cnc_cred.Domain != req_cred.Domain || cnc_cred.UserName != req_cred.UserName ||
 120                                 cnc_cred.Password != req_cred.Password) {
 121                                 needs_reset = true;
 122                         }
 123
 124                         if (!needs_reset) {
 125                                 bool req_sharing = request.UnsafeAuthenticatedConnectionSharing;
 126                                 bool cnc_sharing = cnc.UnsafeAuthenticatedConnectionSharing;
 127                                 needs_reset = (req_sharing == false || req_sharing != cnc_sharing);
 128                         }
 129                         if (needs_reset) {
 130                                 cnc.Close (false); // closes the authenticated connection
 131                                 cnc.ResetNtlm ();
 132                         }
 133                 }
 134
 135                 WebConnection CreateOrReuseConnection (HttpWebRequest request)
 136                 {
 137                         // lock is up there.
 138                         WebConnection cnc;
 139                         WeakReference cncRef;
 140
 141                         int count = connections.Count;
 142                         for (int i = 0; i < count; i++) {
 143                                 WeakReference wr = connections [i] as WeakReference;
 144                                 cnc = wr.Target as WebConnection;
 145                                 if (cnc == null) {
 146                                         connections.RemoveAt (i);
 147                                         count--;
 148                                         i--;
 149                                         continue;
 150                                 }
 151
 152                                 if (cnc.Busy)
 153                                         continue;
 154
 155                                 PrepareSharingNtlm (cnc, request);
 156                                 return cnc;
 157                         }
 158
 159                         if (sPoint.ConnectionLimit > count) {
 160                                 cnc = new WebConnection (this, sPoint);
 161                                 connections.Add (new WeakReference (cnc));
 162                                 return cnc;
 163                         }
 164
 165                         if (rnd == null)
 166                                 rnd = new Random ();
 167
 168                         int idx = (count > 1) ? rnd.Next (0, count) : 0;
 169                         cncRef = (WeakReference) connections [idx];
 170                         cnc = cncRef.Target as WebConnection;
 171                         if (cnc == null) {
 172                                 cnc = new WebConnection (this, sPoint);
 173                                 connections.RemoveAt (idx);
 174                                 connections.Add (new WeakReference (cnc));
 175                         }
 176                         return cnc;
 177                 }
 178
 179                 public string Name {
 180                         get { return name; }
 181                 }
 182
 183                 internal Queue Queue {
 184                         get { return queue; }
 185                 }
 186
 187         }
 188 }
 189