Code:
/ 4.0 / 4.0 / 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. //------------------------------------------------------------------------------ //// 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
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DesignConnectionCollection.cs
- MeshGeometry3D.cs
- PathFigureCollectionValueSerializer.cs
- ReliableChannelBinder.cs
- TypeLibConverter.cs
- SchemaNotation.cs
- Quad.cs
- ValueTypeFixupInfo.cs
- Button.cs
- propertyentry.cs
- SapiInterop.cs
- ArrayConverter.cs
- SmiRecordBuffer.cs
- XmlException.cs
- UnionExpr.cs
- BufferedGraphics.cs
- Crypto.cs
- RangeValidator.cs
- MissingManifestResourceException.cs
- ObjectViewListener.cs
- SystemUdpStatistics.cs
- XmlSchemaSubstitutionGroup.cs
- TreeView.cs
- WebPartEditorOkVerb.cs
- DeferredSelectedIndexReference.cs
- XmlAttribute.cs
- SqlException.cs
- NetTcpSection.cs
- ReflectionTypeLoadException.cs
- SQLInt16.cs
- Exception.cs
- AbsoluteQuery.cs
- SystemBrushes.cs
- ChainedAsyncResult.cs
- MouseCaptureWithinProperty.cs
- DiagnosticStrings.cs
- CollectionViewSource.cs
- PropertyEmitterBase.cs
- RadioButtonBaseAdapter.cs
- DetailsViewInsertedEventArgs.cs
- ThreadExceptionDialog.cs
- DataGrid.cs
- DesignerVerb.cs
- DataGridViewElement.cs
- ChannelEndpointElement.cs
- PngBitmapDecoder.cs
- Constants.cs
- TemplateNameScope.cs
- ScriptingAuthenticationServiceSection.cs
- SafeProcessHandle.cs
- MenuItemStyleCollection.cs
- AuthStoreRoleProvider.cs
- BatchParser.cs
- ServicePointManager.cs
- XsltSettings.cs
- SoapElementAttribute.cs
- StorageEntityTypeMapping.cs
- EntityClassGenerator.cs
- DataPagerFieldItem.cs
- TdsParser.cs
- PageThemeCodeDomTreeGenerator.cs
- loginstatus.cs
- DataGridViewHitTestInfo.cs
- DataExpression.cs
- DataServiceRequestOfT.cs
- TreeViewEvent.cs
- Rights.cs
- SafeSecurityHandles.cs
- DbCommandTree.cs
- DesignerActionItem.cs
- PlatformCulture.cs
- BitmapCodecInfo.cs
- MLangCodePageEncoding.cs
- ProjectionPruner.cs
- AutomationFocusChangedEventArgs.cs
- MetadataArtifactLoaderXmlReaderWrapper.cs
- StylusPointPropertyId.cs
- SupportingTokenChannel.cs
- XPathParser.cs
- PageAdapter.cs
- PageRouteHandler.cs
- Stack.cs
- PathTooLongException.cs
- Line.cs
- RequiredFieldValidator.cs
- BatchWriter.cs
- SafeThreadHandle.cs
- OleDbConnectionFactory.cs
- WSDualHttpSecurityMode.cs
- ObjectDataProvider.cs
- RootNamespaceAttribute.cs
- Point4DValueSerializer.cs
- BStrWrapper.cs
- WebBrowserDocumentCompletedEventHandler.cs
- CollectionView.cs
- MDIWindowDialog.cs
- SQLByte.cs
- RowCache.cs
- OutputChannelBinder.cs
- StrongTypingException.cs