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427 lines
24 KiB
427 lines
24 KiB
/* Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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using Alphaleonis.Win32.Security;
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using Microsoft.Win32.SafeHandles;
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Security;
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using System.Security.AccessControl;
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using FileStream = System.IO.FileStream;
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namespace Alphaleonis.Win32.Filesystem
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{
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public static partial class File
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{
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#region Non-Transactional
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/// <summary>Creates or overwrites a file in the specified path.</summary>
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/// <param name="path">The path and name of the file to create.</param>
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/// <returns>A <see cref="FileStream"/> that provides read/write access to the file specified in <paramref name="path"/>.</returns>
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[SecurityCritical]
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public static FileStream Create(string path)
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{
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return CreateFileStreamCore(null, path, ExtendedFileAttributes.Normal, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, NativeMethods.DefaultFileBufferSize, PathFormat.RelativePath);
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}
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/// <summary>Creates or overwrites the specified file.</summary>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <returns>
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/// A <see cref="FileStream"/> with the specified buffer size that provides read/write access to the file specified in
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/// <paramref name="path"/>.
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/// </returns>
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[SecurityCritical]
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public static FileStream Create(string path, int bufferSize)
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{
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return CreateFileStreamCore(null, path, ExtendedFileAttributes.Normal, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, PathFormat.RelativePath);
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}
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/// <summary>
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/// Creates or overwrites the specified file, specifying a buffer size and a
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/// <see cref="FileOptions"/> value that describes how to create or overwrite the file.
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/// </summary>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <param name="options">One of the <see cref="FileOptions"/> values that describes how to create or overwrite the file.</param>
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/// <returns>A new file with the specified buffer size.</returns>
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[SecurityCritical]
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public static FileStream Create(string path, int bufferSize, FileOptions options)
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{
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return CreateFileStreamCore(null, path, (ExtendedFileAttributes) options, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, PathFormat.RelativePath);
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}
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/// <summary>
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/// Creates or overwrites the specified file, specifying a buffer size and a
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/// <see cref="FileOptions"/> value that describes how to create or overwrite the file.
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/// </summary>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <param name="options">One of the <see cref="FileOptions"/> values that describes how to create or overwrite the file.</param>
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/// <param name="fileSecurity">
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/// One of the <see cref="FileSecurity"/> values that determines the access control and audit security for the file.
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/// </param>
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/// <returns>A new file with the specified buffer size, file options, and file security.</returns>
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[SecurityCritical]
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public static FileStream Create(string path, int bufferSize, FileOptions options, FileSecurity fileSecurity)
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{
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return CreateFileStreamCore(null, path, (ExtendedFileAttributes)options, fileSecurity, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, PathFormat.RelativePath);
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}
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/// <summary>Creates or overwrites a file in the specified path.</summary>
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/// <param name="path">The path and name of the file to create.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>
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/// A <see cref="FileStream"/> that provides read/write access to the file specified in
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/// <paramref name="path"/>.
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/// </returns>
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[SecurityCritical]
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public static FileStream Create(string path, PathFormat pathFormat)
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{
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return CreateFileStreamCore(null, path, ExtendedFileAttributes.Normal, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, NativeMethods.DefaultFileBufferSize, pathFormat);
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}
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/// <summary>Creates or overwrites the specified file.</summary>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>
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/// A <see cref="FileStream"/> with the specified buffer size that provides read/write access to the file specified in
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/// <paramref name="path"/>.
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/// </returns>
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[SecurityCritical]
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public static FileStream Create(string path, int bufferSize, PathFormat pathFormat)
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{
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return CreateFileStreamCore(null, path, ExtendedFileAttributes.Normal, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, pathFormat);
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}
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/// <summary>
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/// Creates or overwrites the specified file, specifying a buffer size and a
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/// <see cref="FileOptions"/> value that describes how to create or overwrite the file.
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/// </summary>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">
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/// The number of bytes buffered for reads and writes to the file.
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/// </param>
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/// <param name="options">
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/// One of the <see cref="FileOptions"/> values that describes how to create or overwrite the
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/// file.
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/// </param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>A new file with the specified buffer size.</returns>
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[SecurityCritical]
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public static FileStream Create(string path, int bufferSize, FileOptions options, PathFormat pathFormat)
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{
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return CreateFileStreamCore(null, path, (ExtendedFileAttributes)options, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, pathFormat);
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}
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/// <summary>
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/// Creates or overwrites the specified file, specifying a buffer size and a
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/// <see cref="FileOptions"/> value that describes how to create or overwrite the file.
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/// </summary>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">
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/// The number of bytes buffered for reads and writes to the file.
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/// </param>
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/// <param name="options">
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/// One of the <see cref="FileOptions"/> values that describes how to create or overwrite the
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/// file.
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/// </param>
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/// <param name="fileSecurity">
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/// One of the <see cref="FileSecurity"/> values that determines the access control and audit
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/// security for the file.
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/// </param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>
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/// A new file with the specified buffer size, file options, and file security.
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/// </returns>
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[SecurityCritical]
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public static FileStream Create(string path, int bufferSize, FileOptions options, FileSecurity fileSecurity, PathFormat pathFormat)
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{
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return CreateFileStreamCore(null, path, (ExtendedFileAttributes)options, fileSecurity, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, pathFormat);
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}
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#endregion // .NET
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#region Transactional
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/// <summary>Creates or overwrites a file in the specified path.</summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The path and name of the file to create.</param>
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/// <returns>
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/// A <see cref="FileStream"/> that provides read/write access to the file specified in
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/// <paramref name="path"/>.
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/// </returns>
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[SecurityCritical]
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public static FileStream CreateTransacted(KernelTransaction transaction, string path)
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{
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return CreateFileStreamCore(transaction, path, ExtendedFileAttributes.Normal, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, NativeMethods.DefaultFileBufferSize, PathFormat.RelativePath);
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}
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/// <summary>Creates or overwrites the specified file.</summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">
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/// The number of bytes buffered for reads and writes to the file.
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/// </param>
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/// <returns>
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/// A <see cref="FileStream"/> with the specified buffer size that provides read/write access
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/// to the file specified in <paramref name="path"/>.
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/// </returns>
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[SecurityCritical]
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public static FileStream CreateTransacted(KernelTransaction transaction, string path, int bufferSize)
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{
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return CreateFileStreamCore(transaction, path, ExtendedFileAttributes.Normal, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, PathFormat.RelativePath);
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}
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/// <summary>
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/// Creates or overwrites the specified file, specifying a buffer size and a
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/// <see cref="FileOptions"/> value that describes how to create or overwrite the file.
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/// </summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <param name="options">One of the <see cref="FileOptions"/> values that describes how to create or overwrite the file.</param>
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/// <returns>A new file with the specified buffer size.</returns>
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[SecurityCritical]
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public static FileStream CreateTransacted(KernelTransaction transaction, string path, int bufferSize, FileOptions options)
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{
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return CreateFileStreamCore(transaction, path, (ExtendedFileAttributes)options, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, PathFormat.RelativePath);
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}
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/// <summary>
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/// Creates or overwrites the specified file, specifying a buffer size and a
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/// <see cref="FileOptions"/> value that describes how to create or overwrite the file.
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/// </summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <param name="options">One of the <see cref="FileOptions"/> values that describes how to create or overwrite the file.</param>
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/// <param name="fileSecurity">
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/// One of the <see cref="FileSecurity"/> values that determines the access control and audit security for the file.
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/// </param>
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/// <returns>A new file with the specified buffer size, file options, and file security.</returns>
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[SecurityCritical]
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public static FileStream CreateTransacted(KernelTransaction transaction, string path, int bufferSize, FileOptions options, FileSecurity fileSecurity)
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{
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return CreateFileStreamCore(transaction, path, (ExtendedFileAttributes)options, fileSecurity, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, PathFormat.RelativePath);
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}
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/// <summary>Creates or overwrites a file in the specified path.</summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The path and name of the file to create.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>
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/// A <see cref="FileStream"/> that provides read/write access to the file specified in
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/// <paramref name="path"/>.
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/// </returns>
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[SecurityCritical]
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public static FileStream CreateTransacted(KernelTransaction transaction, string path, PathFormat pathFormat)
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{
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return CreateFileStreamCore(transaction, path, ExtendedFileAttributes.Normal, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, NativeMethods.DefaultFileBufferSize, pathFormat);
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}
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/// <summary>Creates or overwrites the specified file.</summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>
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/// A <see cref="FileStream"/> with the specified buffer size that provides read/write access to the file specified in
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/// <paramref name="path"/>.
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/// </returns>
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[SecurityCritical]
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public static FileStream CreateTransacted(KernelTransaction transaction, string path, int bufferSize, PathFormat pathFormat)
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{
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return CreateFileStreamCore(transaction, path, ExtendedFileAttributes.Normal, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, pathFormat);
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}
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/// <summary>
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/// Creates or overwrites the specified file, specifying a buffer size and a
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/// <see cref="FileOptions"/> value that describes how to create or overwrite the file.
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/// </summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <param name="options">One of the <see cref="FileOptions"/> values that describes how to create or overwrite the file.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>A new file with the specified buffer size.</returns>
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[SecurityCritical]
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public static FileStream CreateTransacted(KernelTransaction transaction, string path, int bufferSize, FileOptions options, PathFormat pathFormat)
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{
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return CreateFileStreamCore(transaction, path, (ExtendedFileAttributes)options, null, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, pathFormat);
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}
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/// <summary>
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/// Creates or overwrites the specified file, specifying a buffer size and a
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/// <see cref="FileOptions"/> value that describes how to create or overwrite the file.
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/// </summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The name of the file.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <param name="options">One of the <see cref="FileOptions"/> values that describes how to create or overwrite the file.</param>
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/// <param name="fileSecurity">
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/// One of the <see cref="FileSecurity"/> values that determines the access control and audit security for the file.
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/// </param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>A new file with the specified buffer size, file options, and file security.</returns>
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[SecurityCritical]
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public static FileStream CreateTransacted(KernelTransaction transaction, string path, int bufferSize, FileOptions options, FileSecurity fileSecurity, PathFormat pathFormat)
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{
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return CreateFileStreamCore(transaction, path, (ExtendedFileAttributes)options, fileSecurity, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize, pathFormat);
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}
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#endregion
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#region Internal
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/// <summary>Creates or overwrites a file in the specified path.</summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The name of the file.</param>
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/// <param name="attributes">The <see cref="ExtendedFileAttributes"/> additional advanced options to create a file.</param>
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/// <param name="fileSecurity">
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/// A <see cref="FileSecurity"/> instance that determines the access control and audit security for the file.
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/// </param>
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/// <param name="mode">The <see cref="FileMode"/> option gives you more precise control over how you want to create a file.</param>
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/// <param name="access">
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/// The <see cref="FileAccess"/> allow you additionally specify to default read/write capability - just write, bypassing any cache.
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/// </param>
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/// <param name="share">
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/// The <see cref="FileShare"/> option controls how you would like to share created file with other requesters.
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/// </param>
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/// <param name="pathFormat">Indicates the format of the <paramref name="path"/> parameter.</param>
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/// <param name="bufferSize">The number of bytes buffered for reads and writes to the file.</param>
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/// <returns>A <see cref="FileStream"/> that provides read/write access to the file specified in path.</returns>
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[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Justification = "False positive")]
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[SecurityCritical]
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internal static FileStream CreateFileStreamCore(KernelTransaction transaction, string path, ExtendedFileAttributes attributes, FileSecurity fileSecurity, FileMode mode, FileAccess access, FileShare share, int bufferSize, PathFormat pathFormat)
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{
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SafeFileHandle safeHandle = null;
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try
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{
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safeHandle = CreateFileCore(transaction, path, attributes, fileSecurity, mode, (FileSystemRights) access, share, true, pathFormat);
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return new FileStream(safeHandle, access, bufferSize, (attributes & ExtendedFileAttributes.Overlapped) != 0);
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}
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catch
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{
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if (safeHandle != null)
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safeHandle.Dispose();
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throw;
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}
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}
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/// <summary>Creates or opens a file, directory or I/O device.</summary>
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/// <returns>A <see cref="SafeFileHandle"/> that provides read/write access to the file or directory specified by <paramref name="path"/>.</returns>
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/// <remarks>
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/// <para>To obtain a directory handle using CreateFile, specify the FILE_FLAG_BACKUP_SEMANTICS flag as part of dwFlagsAndAttributes.</para>
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/// <para>The most commonly used I/O devices are as follows: file, file stream, directory, physical disk, volume, console buffer, tape drive, communications resource, mailslot, and pipe.</para>
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/// </remarks>
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/// <exception cref="ArgumentException"/>
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/// <exception cref="ArgumentNullException"/>
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/// <exception cref="NotSupportedException"/>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The path and name of the file or directory to create.</param>
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/// <param name="attributes">One of the <see cref="ExtendedFileAttributes"/> values that describes how to create or overwrite the file or directory.</param>
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/// <param name="fileSecurity">A <see cref="FileSecurity"/> instance that determines the access control and audit security for the file or directory.</param>
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/// <param name="fileMode">A <see cref="FileMode"/> constant that determines how to open or create the file or directory.</param>
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/// <param name="fileSystemRights">A <see cref="FileSystemRights"/> constant that determines the access rights to use when creating access and audit rules for the file or directory.</param>
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/// <param name="fileShare">A <see cref="FileShare"/> constant that determines how the file or directory will be shared by processes.</param>
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/// <param name="checkPath">.</param>
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/// <param name="pathFormat">Indicates the format of the <paramref name="path"/> parameter.</param>
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[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Justification = "Object needs to be disposed by caller.")]
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[SecurityCritical]
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internal static SafeFileHandle CreateFileCore(KernelTransaction transaction, string path, ExtendedFileAttributes attributes, FileSecurity fileSecurity, FileMode fileMode, FileSystemRights fileSystemRights, FileShare fileShare, bool checkPath, PathFormat pathFormat)
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{
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if (checkPath && pathFormat == PathFormat.RelativePath)
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Path.CheckSupportedPathFormat(path, true, true);
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// When isFile == null, we're working with a device.
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// When opening a VOLUME or removable media drive (for example, a floppy disk drive or flash memory thumb drive),
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// the path string should be the following form: "\\.\X:"
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// Do not use a trailing backslash (\), which indicates the root.
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var pathLp = Path.GetExtendedLengthPathCore(transaction, path, pathFormat, GetFullPathOptions.TrimEnd | GetFullPathOptions.RemoveTrailingDirectorySeparator);
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PrivilegeEnabler privilegeEnabler = null;
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var isAppend = fileMode == FileMode.Append;
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// CreateFileXxx() does not support FileMode.Append mode.
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if (isAppend)
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{
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fileMode = FileMode.OpenOrCreate;
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fileSystemRights &= FileSystemRights.AppendData; // Add right.
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}
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if (fileSecurity != null)
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fileSystemRights |= (FileSystemRights) 0x1000000; // Set right.
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// AccessSystemSecurity = 0x1000000 AccessSystemAcl access type.
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// MaximumAllowed = 0x2000000 MaximumAllowed access type.
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if ((fileSystemRights & (FileSystemRights) 0x1000000) != 0 ||
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(fileSystemRights & (FileSystemRights) 0x2000000) != 0)
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privilegeEnabler = new PrivilegeEnabler(Privilege.Security);
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using (privilegeEnabler)
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using (var securityAttributes = new Security.NativeMethods.SecurityAttributes(fileSecurity))
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{
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var handle = transaction == null || !NativeMethods.IsAtLeastWindowsVista
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// CreateFile() / CreateFileTransacted()
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// In the ANSI version of this function, the name is limited to MAX_PATH characters.
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|
// To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path.
|
|
// 2013-01-13: MSDN confirms LongPath usage.
|
|
|
|
? NativeMethods.CreateFile(pathLp, fileSystemRights, fileShare, securityAttributes, fileMode, attributes, IntPtr.Zero)
|
|
: NativeMethods.CreateFileTransacted(pathLp, fileSystemRights, fileShare, securityAttributes, fileMode, attributes, IntPtr.Zero, transaction.SafeHandle, IntPtr.Zero, IntPtr.Zero);
|
|
|
|
var lastError = Marshal.GetLastWin32Error();
|
|
|
|
if (handle.IsInvalid)
|
|
{
|
|
handle.Close();
|
|
NativeError.ThrowException(lastError, pathLp);
|
|
}
|
|
|
|
|
|
if (isAppend)
|
|
{
|
|
var stream = new FileStream(handle, FileAccess.Write, NativeMethods.DefaultFileBufferSize, (attributes & ExtendedFileAttributes.Overlapped) != 0);
|
|
stream.Seek(0, SeekOrigin.End);
|
|
}
|
|
|
|
return handle;
|
|
}
|
|
}
|
|
|
|
#endregion // CreateFileCore
|
|
}
|
|
}
|
|
|