Kenneth Hsu
2aa76881a5
This makes it explicit at compile-time that these fields should not be reassigned outside the constructor.
578 lines
25 KiB
C#
578 lines
25 KiB
C#
// Copyright (C) 2015, The Duplicati Team
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// http://www.duplicati.com, info@duplicati.com
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using System.Collections.Generic;
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using System.Security.AccessControl;
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using System.IO;
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using System.Linq;
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using AlphaFS = Alphaleonis.Win32.Filesystem;
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using Duplicati.Library.Interface;
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namespace Duplicati.Library.Common.IO
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{
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public struct SystemIOWindows : ISystemIO
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{
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private const string UNCPREFIX = @"\\?\";
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private const string UNCPREFIX_SERVER = @"\\?\UNC\";
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private const string PATHPREFIX_SERVER = @"\\";
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private static readonly string DIRSEP = Util.DirectorySeparatorString;
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private static bool IsPathTooLong(string path)
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{
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return path.StartsWith(UNCPREFIX, StringComparison.Ordinal) || path.StartsWith(UNCPREFIX_SERVER, StringComparison.Ordinal) || path.Length > 260;
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}
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public static string PrefixWithUNC(string path)
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{
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if (path.StartsWith(UNCPREFIX_SERVER, StringComparison.Ordinal))
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return path;
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if (path.StartsWith(UNCPREFIX, StringComparison.Ordinal))
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return path;
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return path.StartsWith(PATHPREFIX_SERVER, StringComparison.Ordinal)
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? UNCPREFIX_SERVER + path.Remove(0, PATHPREFIX_SERVER.Length)
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: UNCPREFIX + path;
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}
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public static string StripUNCPrefix(string path)
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{
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return path.StartsWith(UNCPREFIX, StringComparison.Ordinal) ? path.Substring(UNCPREFIX.Length) : path;
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}
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private class FileSystemAccess
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{
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public readonly FileSystemRights Rights;
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public readonly AccessControlType ControlType;
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public readonly string SID;
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public readonly bool Inherited;
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public readonly InheritanceFlags Inheritance;
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public readonly PropagationFlags Propagation;
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public FileSystemAccess()
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{
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}
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public FileSystemAccess(FileSystemAccessRule rule)
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{
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Rights = rule.FileSystemRights;
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ControlType = rule.AccessControlType;
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SID = rule.IdentityReference.Value;
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Inherited = rule.IsInherited;
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Inheritance = rule.InheritanceFlags;
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Propagation = rule.PropagationFlags;
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}
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public FileSystemAccessRule Create(System.Security.AccessControl.FileSystemSecurity owner)
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{
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return (FileSystemAccessRule)owner.AccessRuleFactory(
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new System.Security.Principal.SecurityIdentifier(SID),
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(int)Rights,
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Inherited,
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Inheritance,
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Propagation,
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ControlType);
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}
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}
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private static Newtonsoft.Json.JsonSerializer _cachedSerializer;
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private Newtonsoft.Json.JsonSerializer Serializer
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{
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get
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{
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if (_cachedSerializer != null)
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{
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return _cachedSerializer;
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}
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_cachedSerializer = Newtonsoft.Json.JsonSerializer.Create(
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new Newtonsoft.Json.JsonSerializerSettings { Culture = System.Globalization.CultureInfo.InvariantCulture });
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return _cachedSerializer;
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}
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}
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private string SerializeObject<T>(T o)
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{
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using (var tw = new System.IO.StringWriter())
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{
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Serializer.Serialize(tw, o);
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tw.Flush();
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return tw.ToString();
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}
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}
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private T DeserializeObject<T>(string data)
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{
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using (var tr = new System.IO.StringReader(data))
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{
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return (T)Serializer.Deserialize(tr, typeof(T));
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}
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}
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private System.Security.AccessControl.FileSystemSecurity GetAccessControlDir(string path)
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{
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return PathTooLongFuncWrapper(System.IO.Directory.GetAccessControl,
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Alphaleonis.Win32.Filesystem.Directory.GetAccessControl, path, true);
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}
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private System.Security.AccessControl.FileSystemSecurity GetAccessControlFile(string path)
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{
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return PathTooLongFuncWrapper(System.IO.File.GetAccessControl,
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Alphaleonis.Win32.Filesystem.File.GetAccessControl, path, true);
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}
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private void SetAccessControlFile(string path, FileSecurity rules)
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{
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PathTooLongActionWrapper(p => System.IO.File.SetAccessControl(p, rules),
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p => Alphaleonis.Win32.Filesystem.File.SetAccessControl(p, rules, AccessControlSections.All),
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path, true);
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}
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private void SetAccessControlDir(string path, DirectorySecurity rules)
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{
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PathTooLongActionWrapper(p => System.IO.Directory.SetAccessControl(p, rules),
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p => Alphaleonis.Win32.Filesystem.Directory.SetAccessControl(p, rules, AccessControlSections.All),
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path, true);
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}
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private static void PathTooLongVoidFuncWrapper<U, T>(Func<string, T> nativeIOFunc,
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Func<string, U> alternativeIOFunc,
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string path, bool prefixWithUnc = false)
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{
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// Wrap void into bool return type to avoid code duplication. Code at anytime available for replacement.
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PathTooLongFuncWrapper(p => { nativeIOFunc(p); return true; }, p => { alternativeIOFunc(p); return true; } , path, prefixWithUnc);
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}
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private static void PathTooLongActionWrapper(Action<string> nativeIOFunc,
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Action<string> alternativeIOFunc,
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string path, bool prefixWithUnc = false)
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{
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// Wrap void into bool return type to avoid code duplication. Code at anytime available for replacement.
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PathTooLongFuncWrapper(p => { nativeIOFunc(p); return true; }, p => { alternativeIOFunc(p); return true; }, path, prefixWithUnc);
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}
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private static T PathTooLongFuncWrapper<T>(Func<string, T> nativeIOFunc,
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Func<string, T> alternativeIOFunc,
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string path, bool prefixWithUnc = false)
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{
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if (!IsPathTooLong(path))
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try { return nativeIOFunc(path); }
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catch (System.IO.PathTooLongException) { }
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catch (System.ArgumentException) { }
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return !prefixWithUnc ? alternativeIOFunc(path) : alternativeIOFunc(PrefixWithUNC(path));
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}
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#region ISystemIO implementation
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public void DirectoryDelete(string path)
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{
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PathTooLongActionWrapper(System.IO.Directory.Delete,
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Alphaleonis.Win32.Filesystem.Directory.Delete, path, true);
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}
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public void DirectoryCreate(string path)
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{
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PathTooLongVoidFuncWrapper(System.IO.Directory.CreateDirectory,
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Alphaleonis.Win32.Filesystem.Directory.CreateDirectory, path, true);
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}
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public bool DirectoryExists(string path)
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{
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return PathTooLongFuncWrapper(System.IO.Directory.Exists,
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Alphaleonis.Win32.Filesystem.Directory.Exists, path, true);
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}
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public void FileDelete(string path)
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{
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PathTooLongActionWrapper(System.IO.File.Delete,
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Alphaleonis.Win32.Filesystem.File.Delete, path, true);
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}
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public void FileSetLastWriteTimeUtc(string path, DateTime time)
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{
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PathTooLongActionWrapper(p => System.IO.File.SetLastWriteTimeUtc(p, time),
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p => Alphaleonis.Win32.Filesystem.File.SetLastWriteTimeUtc(p, time), path, true);
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}
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public void FileSetCreationTimeUtc(string path, DateTime time)
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{
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PathTooLongActionWrapper(p => System.IO.File.SetCreationTimeUtc(p, time),
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p => Alphaleonis.Win32.Filesystem.File.SetCreationTimeUtc(p, time), path, true);
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}
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public DateTime FileGetLastWriteTimeUtc(string path)
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{
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return PathTooLongFuncWrapper(System.IO.File.GetLastWriteTimeUtc,
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Alphaleonis.Win32.Filesystem.File.GetLastWriteTimeUtc, path, true);
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}
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public DateTime FileGetCreationTimeUtc(string path)
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{
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return PathTooLongFuncWrapper(System.IO.File.GetCreationTimeUtc,
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Alphaleonis.Win32.Filesystem.File.GetCreationTimeUtc, path, true);
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}
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public bool FileExists(string path)
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{
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return PathTooLongFuncWrapper(System.IO.File.Exists,
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Alphaleonis.Win32.Filesystem.File.Exists, path, true);
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}
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public System.IO.FileStream FileOpenRead(string path)
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{
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return PathTooLongFuncWrapper(p => System.IO.File.Open(p, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite),
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p => Alphaleonis.Win32.Filesystem.File.Open(p, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite),
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path, true);
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}
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public System.IO.FileStream FileOpenWrite(string path)
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{
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return !FileExists(path)
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? FileCreate(path)
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: PathTooLongFuncWrapper(System.IO.File.OpenWrite, Alphaleonis.Win32.Filesystem.File.OpenWrite, path, true);
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}
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public System.IO.FileStream FileOpenReadWrite(string path)
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{
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return PathTooLongFuncWrapper(p => System.IO.File.Open(p, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite, System.IO.FileShare.Read),
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p => Alphaleonis.Win32.Filesystem.File.Open(p, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read), path, true);
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}
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public System.IO.FileStream FileCreate(string path)
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{
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return PathTooLongFuncWrapper(System.IO.File.Create, Alphaleonis.Win32.Filesystem.File.Create, path, true);
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}
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public System.IO.FileAttributes GetFileAttributes(string path)
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{
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return PathTooLongFuncWrapper(System.IO.File.GetAttributes, AlphaFS.File.GetAttributes, path, true);
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}
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public void SetFileAttributes(string path, System.IO.FileAttributes attributes)
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{
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PathTooLongActionWrapper(p => System.IO.File.SetAttributes(p, attributes),
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p => Alphaleonis.Win32.Filesystem.File.SetAttributes(p, attributes), path, true);
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}
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/// <summary>
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/// Returns the symlink target if the entry is a symlink, and null otherwise
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/// </summary>
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/// <param name="file">The file or folder to examine</param>
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/// <returns>The symlink target</returns>
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public string GetSymlinkTarget(string file)
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{
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try
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{
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return PathTooLongFuncWrapper(AlphaFS.File.GetLinkTargetInfo, AlphaFS.File.GetLinkTargetInfo, file, true).PrintName;
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}
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catch (AlphaFS.NotAReparsePointException) { }
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catch (AlphaFS.UnrecognizedReparsePointException) { }
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// This path looks like it isn't actually a symlink
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// (Note that some reparse points aren't actually symlinks -
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// things like the OneDrive folder in the Windows 10 Fall Creator's Update for example)
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return null;
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}
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public IEnumerable<string> EnumerateFileSystemEntries(string path)
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{
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return PathTooLongFuncWrapper(System.IO.Directory.EnumerateFileSystemEntries,
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Alphaleonis.Win32.Filesystem.Directory.GetFileSystemEntries,
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path, true).Select(StripUNCPrefix).AsEnumerable();
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}
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public IEnumerable<string> EnumerateFiles(string path)
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{
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return PathTooLongFuncWrapper(System.IO.Directory.EnumerateFiles,
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Alphaleonis.Win32.Filesystem.Directory.GetFiles, path,
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true).Select(StripUNCPrefix).AsEnumerable();
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}
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public string PathGetFileName(string path)
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{
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return StripUNCPrefix(PathTooLongFuncWrapper(System.IO.Path.GetFileName,
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Alphaleonis.Win32.Filesystem.Path.GetFileName,
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path, true));
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}
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public string PathGetDirectoryName(string path)
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{
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return StripUNCPrefix(PathTooLongFuncWrapper(System.IO.Path.GetDirectoryName,
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Alphaleonis.Win32.Filesystem.Path.GetDirectoryName,
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path, true));
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}
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public string PathGetExtension(string path)
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{
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return StripUNCPrefix(PathTooLongFuncWrapper(System.IO.Path.GetExtension,
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Alphaleonis.Win32.Filesystem.Path.GetExtension,
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path, true));
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}
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public string PathChangeExtension(string path, string extension)
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{
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return StripUNCPrefix(PathTooLongFuncWrapper(p => System.IO.Path.ChangeExtension(p, extension),
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p => Alphaleonis.Win32.Filesystem.Path.ChangeExtension(p, extension),
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path, true));
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}
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public void DirectorySetLastWriteTimeUtc(string path, DateTime time)
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{
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PathTooLongActionWrapper(p => System.IO.Directory.SetLastWriteTimeUtc(p, time),
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p => Alphaleonis.Win32.Filesystem.File.SetLastWriteTimeUtc(p, time), path, true);
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}
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public void DirectorySetCreationTimeUtc(string path, DateTime time)
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{
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PathTooLongActionWrapper(p => System.IO.Directory.SetCreationTimeUtc(p, time),
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p => Alphaleonis.Win32.Filesystem.File.SetCreationTimeUtc(p, time), path, true);
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}
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public DateTime DirectoryGetLastWriteTimeUtc(string path)
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{
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return PathTooLongFuncWrapper(System.IO.Directory.GetLastWriteTimeUtc,
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Alphaleonis.Win32.Filesystem.Directory.GetLastWriteTimeUtc, path, true);
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}
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public DateTime DirectoryGetCreationTimeUtc(string path)
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{
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return PathTooLongFuncWrapper(System.IO.Directory.GetCreationTimeUtc,
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Alphaleonis.Win32.Filesystem.Directory.GetCreationTimeUtc, path, true);
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}
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public void FileMove(string source, string target)
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{
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// We do not check if path is too long on target. If so, then we catch an exception.
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PathTooLongActionWrapper(p => System.IO.File.Move(p, target),
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p => Alphaleonis.Win32.Filesystem.File.Move(p, PrefixWithUNC(target)),
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source, true);
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}
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public long FileLength(string path)
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{
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return PathTooLongFuncWrapper(p => new System.IO.FileInfo(p).Length,
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p => new Alphaleonis.Win32.Filesystem.FileInfo(p).Length,
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path, true);
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}
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public void DirectoryDelete(string path, bool recursive)
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{
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PathTooLongActionWrapper(p => System.IO.Directory.Delete(p, recursive),
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p => Alphaleonis.Win32.Filesystem.Directory.Delete(p, recursive),
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path, true);
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}
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public string GetPathRoot(string path)
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{
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return PathTooLongFuncWrapper(Path.GetPathRoot, AlphaFS.Path.GetPathRoot, path, false);
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}
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public string[] GetDirectories(string path)
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{
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return PathTooLongFuncWrapper(Directory.GetDirectories, AlphaFS.Directory.GetDirectories, path, false);
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}
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public string[] GetFiles(string path)
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{
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return PathTooLongFuncWrapper(Directory.GetFiles, AlphaFS.Directory.GetFiles, path, false);
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}
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public string[] GetFiles(string path, string searchPattern)
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{
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return PathTooLongFuncWrapper(p => Directory.GetFiles(p, searchPattern), p => AlphaFS.Directory.GetFiles(p, searchPattern), path, false);
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}
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public DateTime GetCreationTimeUtc(string path)
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{
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return PathTooLongFuncWrapper(Directory.GetCreationTimeUtc, AlphaFS.File.GetCreationTimeUtc, path, false);
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}
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public DateTime GetLastWriteTimeUtc(string path)
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{
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return PathTooLongFuncWrapper(Directory.GetLastWriteTimeUtc, AlphaFS.File.GetLastWriteTimeUtc, path, false);
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}
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public IEnumerable<string> EnumerateDirectories(string path)
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{
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return PathTooLongFuncWrapper(Directory.EnumerateDirectories, AlphaFS.Directory.EnumerateDirectories, path, false);
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}
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public void FileCopy(string source, string target, bool overwrite)
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{
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// We do not check if path is too long on target. If so, then we catch an exception.
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PathTooLongActionWrapper(p => File.Copy(p, target, overwrite), p => AlphaFS.File.Copy(p, target, overwrite), source, false);
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}
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public string PathGetFullPath(string path)
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{
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return PathTooLongFuncWrapper(System.IO.Path.GetFullPath, AlphaFS.Path.GetFullPath, path, false);
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}
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public IFileEntry DirectoryEntry(string path)
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{
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IFileEntry DirectoryEntryNative(string p) {
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var dInfo = new DirectoryInfo(p);
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return new FileEntry(dInfo.Name, 0, dInfo.LastAccessTime, dInfo.LastWriteTime)
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{
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IsFolder = true
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};
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}
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IFileEntry DirectoryEntryAlphaFS(string p)
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{
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var dInfoAlphaFS = new AlphaFS.DirectoryInfo(p);
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return new FileEntry(dInfoAlphaFS.Name, 0, dInfoAlphaFS.LastAccessTime, dInfoAlphaFS.LastWriteTime)
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{
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IsFolder = true
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};
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}
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return PathTooLongFuncWrapper(DirectoryEntryNative, DirectoryEntryAlphaFS, path, false);
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}
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public IFileEntry FileEntry(string path)
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{
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IFileEntry FileEntryNative(string p)
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{
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var fileInfo = new FileInfo(p);
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return new FileEntry(fileInfo.Name, fileInfo.Length, fileInfo.LastAccessTime, fileInfo.LastWriteTime);
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}
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IFileEntry FileEntryAlphaFS(string p)
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{
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var fInfoAlphaFS = new AlphaFS.FileInfo(p);
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return new FileEntry(fInfoAlphaFS.Name, fInfoAlphaFS.Length, fInfoAlphaFS.LastAccessTime, fInfoAlphaFS.LastWriteTime);
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}
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return PathTooLongFuncWrapper(FileEntryNative, FileEntryAlphaFS, path, false);
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}
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public Dictionary<string, string> GetMetadata(string path, bool isSymlink, bool followSymlink)
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{
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var isDirTarget = path.EndsWith(DIRSEP, StringComparison.Ordinal);
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var targetpath = isDirTarget ? path.Substring(0, path.Length - 1) : path;
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var dict = new Dictionary<string, string>();
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FileSystemSecurity rules = isDirTarget ? GetAccessControlDir(targetpath) : GetAccessControlFile(targetpath);
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var objs = new List<FileSystemAccess>();
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foreach (var f in rules.GetAccessRules(true, false, typeof(System.Security.Principal.SecurityIdentifier)))
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objs.Add(new FileSystemAccess((FileSystemAccessRule)f));
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dict["win-ext:accessrules"] = SerializeObject(objs);
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return dict;
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}
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public void SetMetadata(string path, Dictionary<string, string> data, bool restorePermissions)
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{
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var isDirTarget = path.EndsWith(DIRSEP, StringComparison.Ordinal);
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var targetpath = isDirTarget ? path.Substring(0, path.Length - 1) : path;
|
|
|
|
FileSystemSecurity rules = isDirTarget ? GetAccessControlDir(targetpath) : GetAccessControlFile(targetpath);
|
|
if (restorePermissions && data.ContainsKey("win-ext:accessrules"))
|
|
{
|
|
var content = DeserializeObject<FileSystemAccess[]>(data["win-ext:accessrules"]);
|
|
var c = rules.GetAccessRules(true, false, typeof(System.Security.Principal.SecurityIdentifier));
|
|
for (var i = c.Count - 1; i >= 0; i--)
|
|
rules.RemoveAccessRule((System.Security.AccessControl.FileSystemAccessRule)c[i]);
|
|
|
|
Exception ex = null;
|
|
|
|
foreach (var r in content)
|
|
{
|
|
// Attempt to apply as many rules as we can
|
|
try
|
|
{
|
|
rules.AddAccessRule(r.Create(rules));
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
ex = e;
|
|
}
|
|
}
|
|
|
|
if (ex != null)
|
|
throw ex;
|
|
|
|
if (isDirTarget)
|
|
SetAccessControlDir(targetpath, (DirectorySecurity)rules);
|
|
else
|
|
SetAccessControlFile(targetpath, (FileSecurity)rules);
|
|
}
|
|
}
|
|
|
|
public string PathCombine(params string[] paths)
|
|
{
|
|
var combinedPath = "";
|
|
for (int i = 0; i < paths.Length; i++)
|
|
{
|
|
if (i == 0)
|
|
{
|
|
combinedPath = paths[i];
|
|
}
|
|
else
|
|
{
|
|
if (!IsPathTooLong(combinedPath + "\\" + paths[i]))
|
|
{
|
|
try
|
|
{
|
|
combinedPath = Path.Combine(combinedPath, paths[i]);
|
|
}
|
|
catch (Exception ex) when (ex is System.IO.PathTooLongException || ex is System.ArgumentException)
|
|
{
|
|
//TODO: Explain why we need to keep prefixing and stripping UNC's.
|
|
combinedPath = StripUNCPrefix(Alphaleonis.Win32.Filesystem.Path.Combine(PrefixWithUNC(combinedPath), paths[i]));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return combinedPath;
|
|
}
|
|
|
|
public void CreateSymlink(string symlinkfile, string target, bool asDir)
|
|
{
|
|
if (FileExists(symlinkfile) || DirectoryExists(symlinkfile))
|
|
throw new System.IO.IOException(string.Format("File already exists: {0}", symlinkfile));
|
|
|
|
if (asDir)
|
|
{
|
|
Alphaleonis.Win32.Filesystem.Directory.CreateSymbolicLink(PrefixWithUNC(symlinkfile), target, AlphaFS.PathFormat.LongFullPath);
|
|
}
|
|
else
|
|
{
|
|
Alphaleonis.Win32.Filesystem.File.CreateSymbolicLink(PrefixWithUNC(symlinkfile), target, AlphaFS.PathFormat.LongFullPath);
|
|
}
|
|
|
|
//Sadly we do not get a notification if the creation fails :(
|
|
System.IO.FileAttributes attr = 0;
|
|
if ((!asDir && FileExists(symlinkfile)) || (asDir && DirectoryExists(symlinkfile)))
|
|
try { attr = GetFileAttributes(symlinkfile); }
|
|
catch { }
|
|
|
|
if ((attr & System.IO.FileAttributes.ReparsePoint) == 0)
|
|
throw new System.IO.IOException(string.Format("Unable to create symlink, check account permissions: {0}", symlinkfile));
|
|
}
|
|
#endregion
|
|
}
|
|
}
|
|
|