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 && MONO_FEATURE_BTLS
  27 using System;
  28 using System.Threading;
  29 using System.Security.Cryptography;
  30 using System.Runtime.InteropServices;
  31 using System.Runtime.CompilerServices;
  32
  33 namespace Mono.Btls
  34 {
  35         abstract class MonoBtlsObject : IDisposable
  36         {
  37                 internal const string BTLS_DYLIB = "libmono-btls-shared";
  38
  39                 internal MonoBtlsObject (MonoBtlsHandle handle)
  40                 {
  41                         this.handle = handle;
  42                 }
  43
  44                 protected internal abstract class MonoBtlsHandle : SafeHandle
  45                 {
  46                         internal MonoBtlsHandle ()
  47                                 : base (IntPtr.Zero, true)
  48                         {
  49                         }
  50
  51                         internal MonoBtlsHandle (IntPtr handle, bool ownsHandle)
  52                                 : base (handle, ownsHandle)
  53                         {
  54                         }
  55
  56                         public override bool IsInvalid {
  57                                 get { return handle == IntPtr.Zero; }
  58                         }
  59                 }
  60
  61                 internal MonoBtlsHandle Handle {
  62                         get {
  63                                 CheckThrow ();
  64                                 return handle;
  65                         }
  66                 }
  67
  68                 public bool IsValid {
  69                         get { return handle != null && !handle.IsInvalid; }
  70                 }
  71
  72                 MonoBtlsHandle handle;
  73                 Exception lastError;
  74
  75                 protected void CheckThrow ()
  76                 {
  77                         if (lastError != null)
  78                                 throw lastError;
  79                         if (handle == null || handle.IsInvalid)
  80                                 throw new ObjectDisposedException ("MonoBtlsSsl");
  81                 }
  82
  83                 protected Exception SetException (Exception ex)
  84                 {
  85                         if (lastError == null)
  86                                 lastError = ex;
  87                         return ex;
  88                 }
  89
  90                 protected void CheckError (bool ok, [CallerMemberName] string callerName = null)
  91                 {
  92                         if (!ok) {
  93                                 if (callerName != null)
  94                                         throw new CryptographicException ($"`{GetType ().Name}.{callerName}` failed.");
  95                                 else
  96                                         throw new CryptographicException ();
  97                         }
  98                 }
  99
 100                 protected void CheckError (int ret, [CallerMemberName] string callerName = null)
 101                 {
 102                         CheckError (ret == 1, callerName);
 103                 }
 104
 105                 protected internal void CheckLastError ([CallerMemberName] string callerName = null)
 106                 {
 107                         var error = Interlocked.Exchange (ref lastError, null);
 108                         if (error == null)
 109                                 return;
 110
 111                         string message;
 112                         if (callerName != null)
 113                                 message = $"Caught unhandled exception in `{GetType ().Name}.{callerName}`.";
 114                         else
 115                                 message = "Caught unhandled exception.";
 116                         throw new CryptographicException (message, error);
 117                 }
 118
 119                 [DllImport (BTLS_DYLIB)]
 120                 extern static void mono_btls_free (IntPtr data);
 121
 122                 protected void FreeDataPtr (IntPtr data)
 123                 {
 124                         mono_btls_free (data);
 125                 }
 126
 127                 protected virtual void Close ()
 128                 {
 129                 }
 130
 131                 protected void Dispose (bool disposing)
 132                 {
 133                         if (disposing) {
 134                                 try {
 135                                         if (handle != null) {
 136                                                 Close ();
 137                                                 handle.Dispose ();
 138                                                 handle = null;
 139                                         }
 140                                 } finally {
 141                                         var disposedExc = new ObjectDisposedException (GetType ().Name);
 142                                         Interlocked.CompareExchange (ref lastError, disposedExc, null);
 143                                 }
 144                         }
 145                 }
 146
 147                 public void Dispose ()
 148                 {
 149                         Dispose (true);
 150                         GC.SuppressFinalize (this);
 151                 }
 152
 153                 ~MonoBtlsObject ()
 154                 {
 155                         Dispose (false);
 156                 }
 157         }
 158 }
 159 #endif