Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / SqlClient / TdsParserSafeHandles.cs / 1305376 / TdsParserSafeHandles.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.SqlClient { using System; using System.Data.Common; using System.Diagnostics; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using System.Threading; using System.Runtime.ConstrainedExecution; internal sealed class SNILoadHandle : SafeHandle { internal static readonly SNILoadHandle SingletonInstance = new SNILoadHandle(); internal readonly SNINativeMethodWrapper.SqlAsyncCallbackDelegate ReadAsyncCallbackDispatcher = new SNINativeMethodWrapper.SqlAsyncCallbackDelegate(ReadDispatcher); internal readonly SNINativeMethodWrapper.SqlAsyncCallbackDelegate WriteAsyncCallbackDispatcher = new SNINativeMethodWrapper.SqlAsyncCallbackDelegate(WriteDispatcher); private readonly UInt32 _sniStatus = TdsEnums.SNI_UNINITIALIZED; private readonly EncryptionOptions _encryptionOption; private SNILoadHandle() : base(IntPtr.Zero, true) { // SQL BU DT 346588 - from security review - SafeHandle guarantees this is only called once. // The reason for the safehandle is guaranteed initialization and termination of SNI to // ensure SNI terminates and cleans up properly. RuntimeHelpers.PrepareConstrainedRegions(); try {} finally { _sniStatus = SNINativeMethodWrapper.SNIInitialize(); UInt32 value = 0; // VSDevDiv 479597: If initialize fails, don't call QueryInfo. if (TdsEnums.SNI_SUCCESS == _sniStatus) { // Query OS to find out whether encryption is supported. SNINativeMethodWrapper.SNIQueryInfo(SNINativeMethodWrapper.QTypes.SNI_QUERY_CLIENT_ENCRYPT_POSSIBLE, ref value); } _encryptionOption = (value == 0) ? EncryptionOptions.NOT_SUP : EncryptionOptions.OFF; base.handle = (IntPtr) 1; // Initialize to non-zero dummy variable. } } public override bool IsInvalid { get { return (IntPtr.Zero == base.handle); } } override protected bool ReleaseHandle() { if (base.handle != IntPtr.Zero) { if (TdsEnums.SNI_SUCCESS == _sniStatus) { SNINativeMethodWrapper.SNITerminate(); } base.handle = IntPtr.Zero; } return true; } public UInt32 SNIStatus { get { return _sniStatus; } } public EncryptionOptions Options { get { return _encryptionOption; } } static private void ReadDispatcher(IntPtr key, IntPtr packet, UInt32 error) { // This is the app-domain dispatcher for all async read callbacks, It // simply gets the state object from the key that it is passed, and // calls the state object's read callback. Debug.Assert(IntPtr.Zero != key, "no key passed to read callback dispatcher?"); if (IntPtr.Zero != key) { // NOTE: we will get a null ref here if we don't get a key that // contains a GCHandle to TDSParserStateObject; that is // very bad, and we want that to occur so we can catch it. GCHandle gcHandle = (GCHandle)key; TdsParserStateObject stateObj = (TdsParserStateObject)gcHandle.Target; if (null != stateObj) { stateObj.ReadAsyncCallback(IntPtr.Zero, packet, error); } } } static private void WriteDispatcher(IntPtr key, IntPtr packet, UInt32 error) { // This is the app-domain dispatcher for all async write callbacks, // It simply gets the state object from the key that it is passed, // and calls the state object's write callback. Debug.Assert(IntPtr.Zero != key, "no key passed to write callback dispatcher?"); if (IntPtr.Zero != key) { // NOTE: we will get a null ref here if we don't get a key that // contains a GCHandle to TDSParserStateObject; that is // very bad, and we want that to occur so we can catch it. GCHandle gcHandle = (GCHandle)key; TdsParserStateObject stateObj = (TdsParserStateObject)gcHandle.Target; if (null != stateObj) { stateObj.WriteAsyncCallback(IntPtr.Zero, packet, error); } } } } internal sealed class SNIHandle : SafeHandle { private readonly UInt32 _status = TdsEnums.SNI_UNINITIALIZED; private readonly bool _fSync = false; internal SNIHandle(SNINativeMethodWrapper.ConsumerInfo myInfo, string serverName, bool integratedSecurity, byte[] serverUserName, bool ignoreSniOpenTimeout, int timeout, out byte[] instanceName, bool flushCache, bool fSync) : base(IntPtr.Zero, true) { RuntimeHelpers.PrepareConstrainedRegions(); try {} finally { _fSync = fSync; instanceName = new byte[256]; // Size as specified by netlibs. if (ignoreSniOpenTimeout) { // _status = SNINativeMethodWrapper.SNIOpenEx (myInfo, serverName, ref base.handle, integratedSecurity, serverUserName, instanceName, flushCache, fSync); } else { _status = SNINativeMethodWrapper.SNIOpenSyncEx (myInfo, serverName, ref base.handle, integratedSecurity, serverUserName, instanceName, flushCache, fSync, timeout); } } } internal SNIHandle(SNINativeMethodWrapper.ConsumerInfo myInfo, string serverName, SNIHandle parent) : base(IntPtr.Zero, true) { RuntimeHelpers.PrepareConstrainedRegions(); try {} finally { _status = SNINativeMethodWrapper.SNIOpen(myInfo, serverName, parent, ref base.handle, parent._fSync); } } public override bool IsInvalid { get { return (IntPtr.Zero == base.handle); } } override protected bool ReleaseHandle() { // NOTE: The SafeHandle class guarantees this will be called exactly once. IntPtr ptr = base.handle; base.handle = IntPtr.Zero; if (IntPtr.Zero != ptr) { if (0 != SNINativeMethodWrapper.SNIClose(ptr)) { return false; // SNIClose should never fail. } } return true; } internal UInt32 Status { get { return _status; } } } internal sealed class SNIPacket : SafeHandle { internal SNIPacket(SafeHandle sniHandle) : base(IntPtr.Zero, true) { SNINativeMethodWrapper.SNIPacketAllocate(sniHandle, SNINativeMethodWrapper.IOType.WRITE, ref base.handle); if (IntPtr.Zero == base.handle) { throw SQL.SNIPacketAllocationFailure(); } } public override bool IsInvalid { get { return (IntPtr.Zero == base.handle); } } override protected bool ReleaseHandle() { // NOTE: The SafeHandle class guarantees this will be called exactly once. IntPtr ptr = base.handle; base.handle = IntPtr.Zero; if (IntPtr.Zero != ptr) { SNINativeMethodWrapper.SNIPacketRelease(ptr); } return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
![Network programming in C#, Network Programming in VB.NET, Network Programming in .NET](/images/book.jpg)
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- EmbeddedObject.cs
- SmtpTransport.cs
- KeyValueSerializer.cs
- CodeDomDecompiler.cs
- CaseDesigner.xaml.cs
- NotifyParentPropertyAttribute.cs
- SafeNativeMethodsCLR.cs
- NameSpaceExtractor.cs
- SignatureToken.cs
- Parameter.cs
- RoleService.cs
- CharacterBufferReference.cs
- WithParamAction.cs
- TwoPhaseCommitProxy.cs
- XmlCompatibilityReader.cs
- DbConnectionInternal.cs
- FunctionUpdateCommand.cs
- HtmlCalendarAdapter.cs
- OptimizerPatterns.cs
- FastEncoderWindow.cs
- DataControlField.cs
- CopyOnWriteList.cs
- XmlWriterTraceListener.cs
- RegexTree.cs
- ScriptHandlerFactory.cs
- BaseTemplateCodeDomTreeGenerator.cs
- Hex.cs
- EventHandlerList.cs
- PropertyBuilder.cs
- XmlSchemaCollection.cs
- BuildManager.cs
- LinqToSqlWrapper.cs
- ExtensibleClassFactory.cs
- PrincipalPermission.cs
- WindowsProgressbar.cs
- ZoneIdentityPermission.cs
- ComplexPropertyEntry.cs
- SelectionPattern.cs
- UniqueConstraint.cs
- BaseDataListPage.cs
- CreateRefExpr.cs
- WebServiceMethodData.cs
- RijndaelManaged.cs
- RelatedEnd.cs
- FixedSOMPageConstructor.cs
- IntAverageAggregationOperator.cs
- HierarchicalDataTemplate.cs
- SqlDataAdapter.cs
- RuleConditionDialog.cs
- SmiRecordBuffer.cs
- RenamedEventArgs.cs
- UMPAttributes.cs
- Font.cs
- SynchronizationLockException.cs
- DragEvent.cs
- BoundColumn.cs
- IdentityNotMappedException.cs
- exports.cs
- SqlConnectionString.cs
- XmlSchemaObjectCollection.cs
- ParenthesizePropertyNameAttribute.cs
- EntityCollection.cs
- ReadOnlyNameValueCollection.cs
- Point3DAnimationUsingKeyFrames.cs
- CloseSequenceResponse.cs
- Membership.cs
- TableLayoutPanelResizeGlyph.cs
- Privilege.cs
- MembershipPasswordException.cs
- MetadataItemEmitter.cs
- EmptyCollection.cs
- ButtonBaseDesigner.cs
- CodeValidator.cs
- ReturnEventArgs.cs
- SqlDataSourceFilteringEventArgs.cs
- ExpressionBinding.cs
- InitializationEventAttribute.cs
- WebBrowser.cs
- CompiledRegexRunner.cs
- TerminatorSinks.cs
- AppDomainUnloadedException.cs
- LicenseManager.cs
- DropShadowEffect.cs
- BufferModeSettings.cs
- UnaryQueryOperator.cs
- RIPEMD160Managed.cs
- CodeSnippetExpression.cs
- Journaling.cs
- OutOfProcStateClientManager.cs
- SupportsEventValidationAttribute.cs
- SoapExtensionImporter.cs
- RegionInfo.cs
- TabPanel.cs
- ItemCollectionEditor.cs
- SafeProcessHandle.cs
- BitmapEffectInputData.cs
- ToolboxCategory.cs
- TitleStyle.cs
- SchemaTableOptionalColumn.cs
- EntityCollection.cs