Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / SqlClient / TdsParserSafeHandles.cs / 2 / 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; // 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.
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