Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / System.ServiceModel.Activation / System / ServiceModel / Activation / MetabaseReader.cs / 1305376 / MetabaseReader.cs
//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------- namespace System.ServiceModel.Activation { using System; using System.Collections.Generic; using System.Globalization; using System.Runtime; using System.Runtime.InteropServices; using System.Security; using System.ServiceModel.Activation.Interop; using System.Threading; // These values are copied from %SDXROOT%\public\sdk\inc\iiscnfg.h. enum MetabasePropertyType { ServerBindings = 1023, SecureBindings = 2021, AuthFlags = 6000, Realm = 6001, AnonymousUserName = 6020, AnonymousPassword = 6021, AccessSslFlags = 6030, AuthPersistence = 6031, AuthProviders = 6032, } [Fx.Tag.SecurityNote(Critical = "Does a bunch of unsafe and native access." + "Caller should guard MetabaseReader instance as well as any results.")] #pragma warning disable 618 // have not moved to the v4 security model yet [SecurityCritical(SecurityCriticalScope.Everything)] #pragma warning restore 618 class MetabaseReader : IDisposable { internal const string LMPath = "/LM"; const uint E_INSUFFICIENT_BUFFER = 0x8007007A; const uint E_PATH_NOT_FOUND = 0x80070003; const uint E_DATA_NOT_FOUND = 0x800CC801; static IMSAdminBase adminBase; static object syncRoot = new object(); int mdHandle = 0; [Fx.Tag.SecurityNote(Critical = "Stores a handle.")] [SecurityCritical] METADATA_RECORD record; [Fx.Tag.SecurityNote(Critical = "Handle to an unmanaged resource.")] [SecurityCritical] SafeHandle bufferHandle; uint currentBufferSize = 1024; bool disposed; [Fx.Tag.SecurityNote(Safe = "Access Critical Private Members but does not expose critical private members to callers.")] [SecuritySafeCritical] public MetabaseReader() { lock (syncRoot) { if (adminBase == null) { adminBase = (IMSAdminBase)new MSAdminBase(); } } uint handle; uint hResult = adminBase.OpenKey(MSAdminBase.METADATA_MASTER_ROOT_HANDLE, LMPath, MSAdminBase.METADATA_PERMISSION_READ, MSAdminBase.DEFAULT_METABASE_TIMEOUT, out handle); mdHandle = (int) handle; if (hResult != 0) { throw FxTrace.Exception.AsError(new COMException(SR.Hosting_MetabaseAccessError, (int)hResult)); } bufferHandle = SafeHGlobalHandleCritical.AllocHGlobal(currentBufferSize); } ~MetabaseReader() { Dispose(false); } [Fx.Tag.SecurityNote(Safe = "Access Critical Private Members and returns a managed representation of the handle.")] [SecurityCritical] public object GetData(string path, MetabasePropertyType propertyType) { return GetData(path, (uint)propertyType); } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } [Fx.Tag.SecurityNote(Safe = "Access Critical Private Members but does not expose critical private members to callers.")] [SecuritySafeCritical] void EnsureRecordBuffer(uint bytes) { if (bytes <= currentBufferSize) { return; } bufferHandle.Close(); currentBufferSize = bytes; bufferHandle = SafeHGlobalHandleCritical.AllocHGlobal(currentBufferSize); record.pbMDData = bufferHandle.DangerousGetHandle(); record.dwMDDataLen = currentBufferSize; } [Fx.Tag.SecurityNote(Critical = "Accesses and Returns SecurityCritical private data.")] [SecurityCritical] object GetData(string path, uint type) { uint bytes = currentBufferSize; record.dwMDAttributes = MSAdminBase.METADATA_INHERIT; record.dwMDUserType = MSAdminBase.IIS_MD_UT_SERVER; record.dwMDDataType = MSAdminBase.ALL_METADATA; record.dwMDIdentifier = type; record.pbMDData = bufferHandle.DangerousGetHandle(); record.dwMDDataLen = currentBufferSize; uint hResult = adminBase.GetData((uint) mdHandle, path, ref record, ref bytes); if (hResult == E_INSUFFICIENT_BUFFER) { EnsureRecordBuffer(bytes); hResult = adminBase.GetData((uint) mdHandle, path, ref record, ref bytes); } if (hResult == E_PATH_NOT_FOUND || hResult == E_DATA_NOT_FOUND) { return null; } else if (hResult != 0) { throw FxTrace.Exception.AsError(new COMException(SR.Hosting_MetabaseAccessError, (int)hResult)); } return ConvertData(); } [Fx.Tag.SecurityNote(Critical = "Accesses and Returns SecurityCritical private data.")] [SecurityCritical] object ConvertData() { switch (record.dwMDDataType) { case MSAdminBase.DWORD_METADATA: return (UInt32)Marshal.ReadInt32(record.pbMDData); case MSAdminBase.EXPANDSZ_METADATA: case MSAdminBase.STRING_METADATA: return Marshal.PtrToStringUni(record.pbMDData); case MSAdminBase.MULTISZ_METADATA: return RecordToStringArray(); default: throw FxTrace.Exception.AsError(new NotSupportedException( SR.Hosting_MetabaseDataTypeUnsupported( record.dwMDDataType.ToString(NumberFormatInfo.CurrentInfo), record.dwMDIdentifier.ToString(NumberFormatInfo.CurrentInfo)))); } } [Fx.Tag.SecurityNote(Critical = "Accesses and Returns SecurityCritical private data.")] [SecurityCritical] string[] RecordToStringArray() { Listlist = new List (); if (record.dwMDDataType == MSAdminBase.MULTISZ_METADATA) { // Ensure that the data is an array of double-byte unicode chars. if ((record.dwMDDataLen & 1) != 0) { throw FxTrace.Exception.AsError(new DataMisalignedException( SR.Hosting_MetabaseDataStringsTerminate(record.dwMDIdentifier.ToString(NumberFormatInfo.CurrentInfo)))); } int startPos = 0; int endPos = 0; while (record.dwMDDataLen > 0) { // Scan for a null terminator. while (endPos < record.dwMDDataLen && Marshal.ReadInt16(record.pbMDData, endPos) != 0) { endPos += 2; } if (endPos == record.dwMDDataLen && Marshal.ReadInt16(record.pbMDData, endPos - 2) != 0) { throw FxTrace.Exception.AsError(new DataMisalignedException( SR.Hosting_MetabaseDataStringsTerminate(record.dwMDIdentifier.ToString(NumberFormatInfo.CurrentInfo)))); } // End of the string. if (endPos == startPos) { break; } // Convert to string. list.Add(Marshal.PtrToStringUni(new IntPtr(record.pbMDData.ToInt64() + startPos), (endPos - startPos)/2)); // Go to next string startPos = endPos += 2; } } return list.ToArray(); } [Fx.Tag.SecurityNote(Safe = "Access Critical Private Members but does not expose critical private members to callers.")] [SecuritySafeCritical] void Dispose(bool disposing) { if (!disposed) { if (disposing) { record.pbMDData = IntPtr.Zero; currentBufferSize = 0; if (bufferHandle != null) { bufferHandle.Close(); } } int handleToClose = Interlocked.Exchange(ref mdHandle, 0); if (handleToClose != 0) { adminBase.CloseKey((uint) handleToClose); } //Notice we cannot assign adminBase to NULL in Dispose, because //it could be shared by multiple instances of MetabaseReader. disposed = true; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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