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360 lines
16 KiB
C#
360 lines
16 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="LocalDB.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">antonam</owner>
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//------------------------------------------------------------------------------
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namespace System.Data
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{
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using System.Configuration;
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using System.Threading;
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using System.Runtime.InteropServices;
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using System.Data.Common;
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using System.Globalization;
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using System.Data.SqlClient;
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using System.Collections.Generic;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Diagnostics;
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using System.Security;
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using System.Security.Permissions;
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internal static class LocalDBAPI
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{
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const string const_localDbPrefix = @"(localdb)\";
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const string const_partialTrustFlagKey = "ALLOW_LOCALDB_IN_PARTIAL_TRUST";
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static PermissionSet _fullTrust = null;
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static bool _partialTrustFlagChecked = false;
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static bool _partialTrustAllowed = false;
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// check if name is in format (localdb)\<InstanceName - not empty> and return instance name if it is
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internal static string GetLocalDbInstanceNameFromServerName(string serverName)
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{
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if (serverName == null)
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return null;
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serverName = serverName.TrimStart(); // it can start with spaces if specified in quotes
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if (!serverName.StartsWith(const_localDbPrefix, StringComparison.OrdinalIgnoreCase))
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return null;
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string instanceName = serverName.Substring(const_localDbPrefix.Length).Trim();
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if (instanceName.Length == 0)
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return null;
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else
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return instanceName;
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}
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#if !MONO
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internal static void ReleaseDLLHandles()
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{
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s_userInstanceDLLHandle = IntPtr.Zero;
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s_localDBFormatMessage = null;
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s_localDBCreateInstance = null;
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}
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//This is copy of handle that SNI maintains, so we are responsible for freeing it - therefore there we are not using SafeHandle
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static IntPtr s_userInstanceDLLHandle = IntPtr.Zero;
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static object s_dllLock = new object();
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static IntPtr UserInstanceDLLHandle
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{
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get
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{
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if (s_userInstanceDLLHandle==IntPtr.Zero)
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{
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bool lockTaken = false;
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RuntimeHelpers.PrepareConstrainedRegions();
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try
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{
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Monitor.Enter(s_dllLock, ref lockTaken);
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if (s_userInstanceDLLHandle == IntPtr.Zero)
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{
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SNINativeMethodWrapper.SNIQueryInfo(SNINativeMethodWrapper.QTypes.SNI_QUERY_LOCALDB_HMODULE, ref s_userInstanceDLLHandle);
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if (s_userInstanceDLLHandle != IntPtr.Zero)
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{
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Bid.Trace("<sc.LocalDBAPI.UserInstanceDLLHandle> LocalDB - handle obtained");
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}
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else
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{
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SNINativeMethodWrapper.SNI_Error sniError = new SNINativeMethodWrapper.SNI_Error();
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SNINativeMethodWrapper.SNIGetLastError(sniError);
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throw CreateLocalDBException(errorMessage: Res.GetString("LocalDB_FailedGetDLLHandle"), sniError: (int)sniError.sniError);
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}
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}
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}
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finally
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{
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if (lockTaken)
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Monitor.Exit(s_dllLock);
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}
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}
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return s_userInstanceDLLHandle;
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}
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}
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[SuppressUnmanagedCodeSecurity]
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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private delegate int LocalDBCreateInstanceDelegate([MarshalAs(UnmanagedType.LPWStr)] string version, [MarshalAs(UnmanagedType.LPWStr)] string instance, UInt32 flags);
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static LocalDBCreateInstanceDelegate s_localDBCreateInstance = null;
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static LocalDBCreateInstanceDelegate LocalDBCreateInstance
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{
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get
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{
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if (s_localDBCreateInstance==null)
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{
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bool lockTaken = false;
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RuntimeHelpers.PrepareConstrainedRegions();
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try
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{
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Monitor.Enter(s_dllLock, ref lockTaken);
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if (s_localDBCreateInstance == null)
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{
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IntPtr functionAddr = SafeNativeMethods.GetProcAddress(UserInstanceDLLHandle, "LocalDBCreateInstance");
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if (functionAddr == IntPtr.Zero)
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{
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int hResult=Marshal.GetLastWin32Error();
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Bid.Trace("<sc.LocalDBAPI.LocalDBCreateInstance> GetProcAddress for LocalDBCreateInstance error 0x{%X}",hResult);
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throw CreateLocalDBException(errorMessage: Res.GetString("LocalDB_MethodNotFound"));
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}
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s_localDBCreateInstance = (LocalDBCreateInstanceDelegate)Marshal.GetDelegateForFunctionPointer(functionAddr, typeof(LocalDBCreateInstanceDelegate));
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}
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}
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finally
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{
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if (lockTaken)
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Monitor.Exit(s_dllLock);
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}
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}
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return s_localDBCreateInstance;
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}
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}
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[SuppressUnmanagedCodeSecurity]
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[UnmanagedFunctionPointer(CallingConvention.Cdecl,CharSet=CharSet.Unicode)]
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private delegate int LocalDBFormatMessageDelegate(int hrLocalDB, UInt32 dwFlags, UInt32 dwLanguageId, StringBuilder buffer, ref UInt32 buflen);
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static LocalDBFormatMessageDelegate s_localDBFormatMessage = null;
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static LocalDBFormatMessageDelegate LocalDBFormatMessage
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{
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get
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{
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if (s_localDBFormatMessage==null)
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{
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bool lockTaken = false;
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RuntimeHelpers.PrepareConstrainedRegions();
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try
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{
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Monitor.Enter(s_dllLock, ref lockTaken);
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if (s_localDBFormatMessage == null)
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{
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IntPtr functionAddr = SafeNativeMethods.GetProcAddress(UserInstanceDLLHandle, "LocalDBFormatMessage");
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if (functionAddr == IntPtr.Zero)
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{
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// SNI checks for LocalDBFormatMessage during DLL loading, so it is practically impossibe to get this error.
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int hResult=Marshal.GetLastWin32Error();
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Bid.Trace("<sc.LocalDBAPI.LocalDBFormatMessage> GetProcAddress for LocalDBFormatMessage error 0x{%X}", hResult);
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throw CreateLocalDBException(errorMessage: Res.GetString("LocalDB_MethodNotFound"));
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}
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s_localDBFormatMessage = (LocalDBFormatMessageDelegate)Marshal.GetDelegateForFunctionPointer(functionAddr, typeof(LocalDBFormatMessageDelegate));
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}
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}
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finally
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{
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if (lockTaken)
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Monitor.Exit(s_dllLock);
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}
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}
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return s_localDBFormatMessage;
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}
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}
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const UInt32 const_LOCALDB_TRUNCATE_ERR_MESSAGE = 1;// flag for LocalDBFormatMessage that indicates that message can be truncated if it does not fit in the buffer
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const int const_ErrorMessageBufferSize = 1024; // Buffer size for Local DB error message, according to Serverless team, 1K will be enough for all messages
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internal static string GetLocalDBMessage(int hrCode)
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{
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Debug.Assert(hrCode < 0, "HRCode does not indicate error");
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try
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{
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StringBuilder buffer = new StringBuilder((int)const_ErrorMessageBufferSize);
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UInt32 len = (UInt32)buffer.Capacity;
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// First try for current culture
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int hResult=LocalDBFormatMessage(hrLocalDB: hrCode, dwFlags: const_LOCALDB_TRUNCATE_ERR_MESSAGE, dwLanguageId: (UInt32)CultureInfo.CurrentCulture.LCID,
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buffer: buffer, buflen: ref len);
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if (hResult>=0)
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return buffer.ToString();
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else
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{
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// Message is not available for current culture, try default
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buffer = new StringBuilder((int)const_ErrorMessageBufferSize);
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len = (UInt32) buffer.Capacity;
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hResult=LocalDBFormatMessage(hrLocalDB: hrCode, dwFlags: const_LOCALDB_TRUNCATE_ERR_MESSAGE, dwLanguageId: 0 /* thread locale with fallback to English */,
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buffer: buffer, buflen: ref len);
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if (hResult >= 0)
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return buffer.ToString();
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else
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return string.Format(CultureInfo.CurrentCulture, "{0} (0x{1:X}).", Res.GetString("LocalDB_UnobtainableMessage"), hResult);
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}
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}
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catch (SqlException exc)
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{
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return string.Format(CultureInfo.CurrentCulture, "{0} ({1}).", Res.GetString("LocalDB_UnobtainableMessage"), exc.Message);
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}
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}
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static SqlException CreateLocalDBException(string errorMessage, string instance = null, int localDbError = 0, int sniError = 0)
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{
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Debug.Assert((localDbError == 0) || (sniError == 0), "LocalDB error and SNI error cannot be specified simultaneously");
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Debug.Assert(!string.IsNullOrEmpty(errorMessage), "Error message should not be null or empty");
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SqlErrorCollection collection = new SqlErrorCollection();
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int errorCode = (localDbError == 0) ? sniError : localDbError;
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if (sniError!=0)
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{
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string sniErrorMessage = SQL.GetSNIErrorMessage(sniError);
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errorMessage = String.Format((IFormatProvider)null, "{0} (error: {1} - {2})",
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errorMessage, sniError, sniErrorMessage);
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}
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collection.Add(new SqlError(errorCode, 0, TdsEnums.FATAL_ERROR_CLASS, instance, errorMessage, null, 0));
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if (localDbError != 0)
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collection.Add(new SqlError(errorCode, 0, TdsEnums.FATAL_ERROR_CLASS, instance, GetLocalDBMessage(localDbError), null, 0));
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SqlException exc = SqlException.CreateException(collection, null);
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exc._doNotReconnect = true;
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return exc;
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}
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private class InstanceInfo
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{
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internal InstanceInfo(string version)
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{
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this.version = version;
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this.created = false;
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}
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internal readonly string version;
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internal bool created;
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}
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static object s_configLock=new object();
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static Dictionary<string, InstanceInfo> s_configurableInstances = null;
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internal static void DemandLocalDBPermissions()
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{
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if (!_partialTrustAllowed)
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{
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if (!_partialTrustFlagChecked)
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{
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object partialTrustFlagValue = AppDomain.CurrentDomain.GetData(const_partialTrustFlagKey);
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if (partialTrustFlagValue != null && partialTrustFlagValue is bool)
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{
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_partialTrustAllowed = (bool)partialTrustFlagValue;
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}
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_partialTrustFlagChecked = true;
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if (_partialTrustAllowed)
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{
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return;
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}
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}
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if (_fullTrust == null)
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{
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_fullTrust = new NamedPermissionSet("FullTrust");
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}
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_fullTrust.Demand();
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}
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}
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internal static void AssertLocalDBPermissions()
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{
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_partialTrustAllowed = true;
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}
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internal static void CreateLocalDBInstance(string instance)
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{
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DemandLocalDBPermissions();
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if (s_configurableInstances == null)
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{
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// load list of instances from configuration, mark them as not created
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bool lockTaken = false;
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RuntimeHelpers.PrepareConstrainedRegions();
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try
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{
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Monitor.Enter(s_configLock, ref lockTaken);
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if (s_configurableInstances == null)
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{
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Dictionary<string, InstanceInfo> tempConfigurableInstances = new Dictionary<string, InstanceInfo>(StringComparer.OrdinalIgnoreCase);
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#if !NO_CONFIGURATION
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object section = PrivilegedConfigurationManager.GetSection("system.data.localdb");
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if (section != null) // if no section just skip creation
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{
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// validate section type
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LocalDBConfigurationSection configSection = section as LocalDBConfigurationSection;
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if (configSection == null)
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throw CreateLocalDBException(errorMessage: Res.GetString("LocalDB_BadConfigSectionType"));
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foreach (LocalDBInstanceElement confElement in configSection.LocalDbInstances)
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{
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Debug.Assert(confElement.Name != null && confElement.Version != null, "Both name and version should not be null");
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tempConfigurableInstances.Add(confElement.Name.Trim(), new InstanceInfo(confElement.Version.Trim()));
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}
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}
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else
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#endif
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Bid.Trace( "<sc.LocalDBAPI.CreateLocalDBInstance> No system.data.localdb section found in configuration");
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s_configurableInstances = tempConfigurableInstances;
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}
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}
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finally
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{
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if (lockTaken)
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Monitor.Exit(s_configLock);
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}
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}
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InstanceInfo instanceInfo = null;
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if (!s_configurableInstances.TryGetValue(instance,out instanceInfo))
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return; // instance name was not in the config
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if (instanceInfo.created)
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return; // instance has already been created
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Debug.Assert(!instance.Contains("\0"), "Instance name should contain embedded nulls");
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if (instanceInfo.version.Contains("\0"))
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throw CreateLocalDBException(errorMessage: Res.GetString("LocalDB_InvalidVersion"), instance: instance);
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// LocalDBCreateInstance is thread- and cross-process safe method, it is OK to call from two threads simultaneously
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int hr = LocalDBCreateInstance(instanceInfo.version, instance, flags: 0);
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Bid.Trace("<sc.LocalDBAPI.CreateLocalDBInstance> Starting creation of instance %ls version %ls", instance, instanceInfo.version);
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if (hr < 0)
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throw CreateLocalDBException(errorMessage: Res.GetString("LocalDB_CreateFailed"), instance: instance, localDbError: hr);
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Bid.Trace("<sc.LocalDBAPI.CreateLocalDBInstance> Finished creation of instance %ls", instance);
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instanceInfo.created=true; // mark instance as created
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} // CreateLocalDbInstance
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#endif
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}
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}
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