Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Configuration / RemoteWebConfigurationHostStream.cs / 1 / RemoteWebConfigurationHostStream.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Configuration { using System.Collections; using System.Configuration; using System.Web; using System.Web.Util; using System.Security; using System.Security.Principal; using System.IO; using System.Web.Hosting; using System.Runtime.InteropServices; using System.Security.Permissions; [SecurityPermission(SecurityAction.Demand, Unrestricted = true)] internal class RemoteWebConfigurationHostStream : Stream { private string _FileName; private string _TemplateFileName; private string _Server; private MemoryStream _MemoryStream; private bool _IsDirty = false; private long _ReadTime = 0; private WindowsIdentity _Identity; private string _Username; private string _Domain; private string _Password; private bool _streamForWrite; internal RemoteWebConfigurationHostStream(bool streamForWrite, string serverName, string streamName, string templateStreamName, string username, string domain, string password, WindowsIdentity identity) { _Server = serverName; _FileName = streamName; _TemplateFileName = templateStreamName; _Username = username; _Domain = domain; _Password = password; _Identity = identity; _streamForWrite = streamForWrite; } private void Init() { #if !FEATURE_PAL // FEATURE_PAL does not enable COM if (_MemoryStream != null) return; byte[] buf = null; WindowsImpersonationContext wiContext = null; try { //////////////////////////////////////////////////////////// // Step 1: Set the impersonation if required if (_Identity != null) { wiContext = _Identity.Impersonate(); } try { IRemoteWebConfigurationHostServer remoteSrv = RemoteWebConfigurationHost.CreateRemoteObject(_Server, _Username, _Domain, _Password); try { // If we open the stream for writing, we only need to get the _ReadTime because // we will create an empty memory stream for write. buf = remoteSrv.GetData(_FileName, _streamForWrite, out _ReadTime); } finally { while (Marshal.ReleaseComObject(remoteSrv) > 0) { } } } catch { throw; } finally { if (wiContext != null) { wiContext.Undo(); // revert impersonation } } } catch { throw; } if (buf == null || buf.Length < 1) { _MemoryStream = new MemoryStream(); } else { _MemoryStream = new MemoryStream(buf.Length); _MemoryStream.Write(buf, 0, buf.Length); _MemoryStream.Position = 0; } #else // !FEATURE_PAL throw new NotSupportedException(); #endif // !FEATURE_PAL } public override bool CanRead { get { return true; } } public override bool CanSeek { get { return true; } } public override bool CanWrite { get { return true; } } public override long Length { get { Init(); return _MemoryStream.Length; } } public override long Position { get { Init(); return _MemoryStream.Position; } set { Init(); _MemoryStream.Position = value; } } public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state) { Init(); return _MemoryStream.BeginRead(buffer, offset, count, callback, state); } public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state) { _IsDirty = true; Init(); if (offset + count > _MemoryStream.Length) _MemoryStream.SetLength(offset + count); return _MemoryStream.BeginWrite(buffer, offset, count, callback, state); } protected override void Dispose(bool disposing) { try { if (disposing && _MemoryStream != null) { Flush(); _MemoryStream.Close(); } } finally { base.Dispose(disposing); } } public override System.Runtime.Remoting.ObjRef CreateObjRef(Type requestedType) { throw new System.Runtime.Remoting.RemotingException(); } public override int EndRead(IAsyncResult asyncResult) { Init(); return _MemoryStream.EndRead(asyncResult); } public override void EndWrite(IAsyncResult asyncResult) { Init(); _MemoryStream.EndWrite(asyncResult); } public override void Flush() { // It's a memory stream. Don't need to flush anything. } internal void FlushForWriteCompleted() { #if !FEATURE_PAL // FEATURE_PAL does not enable COM if (_IsDirty && _MemoryStream != null) { WindowsImpersonationContext wiContext = null; try { //////////////////////////////////////////////////////////// // Step 1: Set the impersonation if required if (_Identity != null) { wiContext = _Identity.Impersonate(); } try { IRemoteWebConfigurationHostServer remoteSrv = RemoteWebConfigurationHost.CreateRemoteObject(_Server, _Username, _Domain, _Password); try { remoteSrv.WriteData(_FileName, _TemplateFileName, _MemoryStream.ToArray(), ref _ReadTime); } catch { throw; } finally { while (Marshal.ReleaseComObject(remoteSrv) > 0) { } } } catch { throw; } finally { if (wiContext != null) { wiContext.Undo(); } } } catch { throw; } _MemoryStream.Flush(); _IsDirty = false; } #else // !FEATURE_PAL throw new NotSupportedException(); #endif // !FEATURE_PAL } public override object InitializeLifetimeService() { Init(); return _MemoryStream.InitializeLifetimeService(); } public override int Read(byte[] buffer, int offset, int count) { Init(); return _MemoryStream.Read(buffer, offset, count); } public override int ReadByte() { Init(); return _MemoryStream.ReadByte(); } public override long Seek(long offset, SeekOrigin origin) { Init(); return _MemoryStream.Seek(offset, origin); } public override void SetLength(long val) { _IsDirty = true; Init(); _MemoryStream.SetLength(val); } public override void Write(byte[] buffer, int offset, int count) { _IsDirty = true; Init(); if (offset + count > _MemoryStream.Length) _MemoryStream.SetLength(offset + count); _MemoryStream.Write(buffer, offset, count); } public override void WriteByte(byte val) { _IsDirty = true; Init(); _MemoryStream.WriteByte(val); } } }
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