mcs/class/System/Mono.Btls/MonoBtlsObject.cs

   1 //
   2 // MonoBtlsObject.cs
   3 //
   4 // Author:
   5 //       Martin Baulig <martin.baulig@xamarin.com>
   6 //
   7 // Copyright (c) 2016 Xamarin Inc. (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining a copy
  10 // of this software and associated documentation files (the "Software"), to deal
  11 // in the Software without restriction, including without limitation the rights
  12 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13 // copies of the Software, and to permit persons to whom the Software is
  14 // furnished to do so, subject to the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be included in
  17 // all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25 // THE SOFTWARE.
  26 #if SECURITY_DEP
  27 using System;
  28 using System.Threading;
  29 using System.Runtime.InteropServices;
  30 using System.Runtime.CompilerServices;
  31
  32 namespace Mono.Btls
  33 {
  34         abstract class MonoBtlsObject : IDisposable
  35         {
  36 #if DYNAMIC_BTLS
  37                 internal const string BTLS_DYLIB = "libmono-btls-shared";
  38 #else
  39                 internal const string BTLS_DYLIB = "__Internal";
  40 #endif
  41
  42                 internal MonoBtlsObject (MonoBtlsHandle handle)
  43                 {
  44                         this.handle = handle;
  45                 }
  46
  47                 protected internal abstract class MonoBtlsHandle : SafeHandle
  48                 {
  49                         internal MonoBtlsHandle ()
  50                                 : base (IntPtr.Zero, true)
  51                         {
  52                         }
  53
  54                         internal MonoBtlsHandle (IntPtr handle, bool ownsHandle)
  55                                 : base (handle, ownsHandle)
  56                         {
  57                         }
  58
  59                         public override bool IsInvalid {
  60                                 get { return handle == IntPtr.Zero; }
  61                         }
  62                 }
  63
  64                 internal MonoBtlsHandle Handle {
  65                         get {
  66                                 CheckThrow ();
  67                                 return handle;
  68                         }
  69                 }
  70
  71                 public bool IsValid {
  72                         get { return handle != null && !handle.IsInvalid; }
  73                 }
  74
  75                 MonoBtlsHandle handle;
  76                 Exception lastError;
  77
  78                 protected void CheckThrow ()
  79                 {
  80                         if (lastError != null)
  81                                 throw lastError;
  82                         if (handle == null || handle.IsInvalid)
  83                                 throw new ObjectDisposedException ("MonoBtlsSsl");
  84                 }
  85
  86                 protected Exception SetException (Exception ex)
  87                 {
  88                         if (lastError == null)
  89                                 lastError = ex;
  90                         return ex;
  91                 }
  92
  93                 protected void CheckError (bool ok, [CallerMemberName] string callerName = null)
  94                 {
  95                         if (!ok) {
  96                                 if (callerName != null)
  97                                         throw new MonoBtlsException ("{0}.{1} failed.", GetType ().Name, callerName);
  98                                 else
  99                                         throw new MonoBtlsException ();
 100                         }
 101
 102                 }
 103
 104                 protected void CheckError (int ret, [CallerMemberName] string callerName = null)
 105                 {
 106                         CheckError (ret == 1, callerName);
 107                 }
 108
 109                 [DllImport (BTLS_DYLIB)]
 110                 extern static void mono_btls_free (IntPtr data);
 111
 112                 protected void FreeDataPtr (IntPtr data)
 113                 {
 114                         mono_btls_free (data);
 115                 }
 116
 117                 protected virtual void Close ()
 118                 {
 119                 }
 120
 121                 protected void Dispose (bool disposing)
 122                 {
 123                         if (disposing) {
 124                                 try {
 125                                         if (handle != null) {
 126                                                 Close ();
 127                                                 handle.Dispose ();
 128                                                 handle = null;
 129                                         }
 130                                 } finally {
 131                                         var disposedExc = new ObjectDisposedException (GetType ().Name);
 132                                         Interlocked.CompareExchange (ref lastError, disposedExc, null);
 133                                 }
 134                         }
 135                 }
 136
 137                 public void Dispose ()
 138                 {
 139                         Dispose (true);
 140                         GC.SuppressFinalize (this);
 141                 }
 142
 143                 ~MonoBtlsObject ()
 144                 {
 145                         Dispose (false);
 146                 }
 147         }
 148 }
 149 #endif