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                 internal MonoBtlsObject (MonoBtlsHandle handle)
  37                 {
  38                         this.handle = handle;
  39                 }
  40
  41                 protected internal abstract class MonoBtlsHandle : SafeHandle
  42                 {
  43                         internal MonoBtlsHandle ()
  44                                 : base (IntPtr.Zero, true)
  45                         {
  46                         }
  47
  48                         internal MonoBtlsHandle (IntPtr handle, bool ownsHandle)
  49                                 : base (handle, ownsHandle)
  50                         {
  51                         }
  52
  53                         public override bool IsInvalid {
  54                                 get { return handle == IntPtr.Zero; }
  55                         }
  56                 }
  57
  58                 internal MonoBtlsHandle Handle {
  59                         get {
  60                                 CheckThrow ();
  61                                 return handle;
  62                         }
  63                 }
  64
  65                 public bool IsValid {
  66                         get { return handle != null && !handle.IsInvalid; }
  67                 }
  68
  69                 MonoBtlsHandle handle;
  70                 Exception lastError;
  71
  72                 protected void CheckThrow ()
  73                 {
  74                         if (lastError != null)
  75                                 throw lastError;
  76                         if (handle == null || handle.IsInvalid)
  77                                 throw new ObjectDisposedException ("MonoBtlsSsl");
  78                 }
  79
  80                 protected Exception SetException (Exception ex)
  81                 {
  82                         if (lastError == null)
  83                                 lastError = ex;
  84                         return ex;
  85                 }
  86
  87                 protected void CheckError (bool ok, [CallerMemberName] string callerName = null)
  88                 {
  89                         if (!ok) {
  90                                 if (callerName != null)
  91                                         throw new MonoBtlsException ("{0}.{1} failed.", GetType ().Name, callerName);
  92                                 else
  93                                         throw new MonoBtlsException ();
  94                         }
  95
  96                 }
  97
  98                 protected void CheckError (int ret, [CallerMemberName] string callerName = null)
  99                 {
 100                         CheckError (ret == 1, callerName);
 101                 }
 102
 103                 [MethodImpl (MethodImplOptions.InternalCall)]
 104                 extern static void mono_btls_free (IntPtr data);
 105
 106                 protected void FreeDataPtr (IntPtr data)
 107                 {
 108                         mono_btls_free (data);
 109                 }
 110
 111                 protected virtual void Close ()
 112                 {
 113                 }
 114
 115                 protected void Dispose (bool disposing)
 116                 {
 117                         if (disposing) {
 118                                 try {
 119                                         if (handle != null) {
 120                                                 Close ();
 121                                                 handle.Dispose ();
 122                                                 handle = null;
 123                                         }
 124                                 } finally {
 125                                         var disposedExc = new ObjectDisposedException (GetType ().Name);
 126                                         Interlocked.CompareExchange (ref lastError, disposedExc, null);
 127                                 }
 128                         }
 129                 }
 130
 131                 public void Dispose ()
 132                 {
 133                         Dispose (true);
 134                         GC.SuppressFinalize (this);
 135                 }
 136
 137                 ~MonoBtlsObject ()
 138                 {
 139                         Dispose (false);
 140                 }
 141         }
 142 }
 143 #endif