453 lines
17 KiB
Plaintext
453 lines
17 KiB
Plaintext
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////////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: SymLinkNode.sg
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//
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// Note:
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//
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using System;
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using System.Text;
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using System.Collections;
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using System.Threading;
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using Microsoft.SingSharp;
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using Microsoft.Singularity;
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using Microsoft.Singularity.Channels;
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using Microsoft.Singularity.Directory;
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using Microsoft.Singularity.Security;
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using Microsoft.Singularity.Security.SDS;
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#if !SINGULARITY_PROCESS
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namespace Microsoft.Singularity.Directory
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#else
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using Microsoft.Singularity;
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using Microsoft.Singularity.V1.Services;
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namespace Microsoft.Application.DSP
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#endif
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{
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// There are no access checks on symbolic links.
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// In order to read a link, traverse access to the parent is sufficient.
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// Although one might think that read access to the parent would be more
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// appropriate here, the nature of the DirectoryService protocol allows anyone
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// traversing a link to find the link value, hence there is no benefit to
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// making "reading" of a link more strict.
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public class SymLinkNode : Node
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{
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private string symbolicLink;
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public SymLinkNode(string value, string! name, Node! parent)
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{
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symbolicLink = value;
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base(NodeType.SymLink, name, parent);
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}
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/// <returns>
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/// null on success, the service argument if it failed.
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/// </returns>
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public override ServiceContract.Exp Bind(StringBuilder! p,
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string! fullPath,
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Principal pr,
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int curpos,
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out int position,
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out bool success,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link,
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out string linkPrefix,
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[Claims]
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ServiceContract.Exp! service)
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{
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Kernel.Waypoint(3500);
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reparse = true;
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success = true;
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linkFound = true;
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position = curpos;
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error = ErrorCode.NoError;
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string rest;
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StringBuilder x;
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StringBuilder y;
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if (! (p.Length == 0)) {
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rest = SbUtils.PathString(p);
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assert rest != null;
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link = symbolicLink + rest;
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int prefixIndex = fullPath.IndexOf(rest);
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if (-1 == prefixIndex) {
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DebugStub.WriteLine("Error processing a link");
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DebugStub.Break();
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linkPrefix = null;
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}
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else {
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x = new StringBuilder(fullPath.Substring(0,prefixIndex));
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y = x;
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y = SbUtils.StripLast(y);
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DebugStub.WriteLine(" symlink node: full={0}, partial={1}, stripped={2}", __arglist(fullPath, x.ToString(), y.ToString()));
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linkPrefix = y.ToString();
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}
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}
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else {
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link = symbolicLink;
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#if old
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int pos = SbUtils.LastIndexOf(sb,'/',0);
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if ( pos == -1 ) pos = 0;
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linkPrefix = fullPath.Substring(0,pos);
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DebugStub.WriteLine(" symlink node: full={0}, stripped={1}", __arglist(fullPath, linkPrefix));
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#else
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x = new StringBuilder(fullPath);
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y = SbUtils.StripLast(x);
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DebugStub.WriteLine(" symlink node: full={0}, stripped={1}", __arglist(fullPath, y.ToString()));
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linkPrefix = y.ToString();
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#endif
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}
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Kernel.Waypoint(3501);
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return service;
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}
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/// <returns>
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/// null on success, the sp argument if it failed.
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/// </returns>
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public override ServiceProviderContract.Imp Register(StringBuilder! p,
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Principal pr,
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[Claims]ServiceProviderContract.Imp! sp,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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// cannot register over an existing name
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reparse = false;
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linkFound = false;
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link = null;
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error = ErrorCode.AlreadyExists;
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position = curpos;
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return sp;
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}
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/// <returns>
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/// The endpoint on success, null, if it fails.
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/// </returns>
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public override ServiceProviderContract.Imp:Start Deregister(StringBuilder! path,
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Principal pr,
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DirectoryServiceContract.Exp! ep,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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error = ErrorCode.NotSupported;
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link = null;
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linkFound = false;
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reparse = false;
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position = curpos;
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if (!(path.Length == 0) ) {
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return null;
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}
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// cannot be removed
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return null;
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}
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/// <returns>
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/// if true returns length and node type, otherwise error
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/// </returns>
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public override bool GetAttributes(StringBuilder! p,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link,
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out long length,
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out NodeType nodeType
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)
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{
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Kernel.Waypoint(3700);
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reparse = true;
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linkFound = true;
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length = 0;
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position = curpos;
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nodeType = NodeType.SymLink;
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error = ErrorCode.NoError;
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// this is a traverse operation. There is more left on the path
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if (! (p.Length == 0)) {
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link = symbolicLink + SbUtils.PathString(p);
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return false;
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}
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// stop here
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reparse = false;
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link = symbolicLink;
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Kernel.Waypoint(3701);
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return true;
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}
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/// <returns>
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/// true on success, false, if it fails.
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/// </returns>
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public override NotifyContract.Imp Notify(StringBuilder! pathSpec,
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Principal pr,
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string! pattern,
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bool sendExisting,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link,
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[Claims] NotifyContract.Imp! notifyImp)
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{
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// this method should never be called
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error = ErrorCode.NotSupported;
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reparse = false;
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link = symbolicLink;
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linkFound = true;
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position = curpos;
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return notifyImp;
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}
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public override FileContract.Imp CreateAndBindFile(StringBuilder! p,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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linkFound = false;
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error = ErrorCode.NotImplemented;
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reparse = false;
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link = null;
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position = curpos;
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return null;
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}
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public override bool CreateDirectory(StringBuilder! p,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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position = curpos;
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//DebugStub.Break();
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reparse = true;
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linkFound = true;
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link = null;
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error = ErrorCode.NoError;
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if (! (p.Length == 0) )
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link = symbolicLink + SbUtils.PathString(p);
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else
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link = symbolicLink ;
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return false;
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}
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public override bool CreateFile(StringBuilder! p,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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linkFound = false;
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error = ErrorCode.NotImplemented;
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reparse = false;
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link = null;
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position = curpos;
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return false;
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}
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public override bool CreateLink(StringBuilder! p,
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Principal pr,
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string! value,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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reparse = true;
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linkFound = true;
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error = ErrorCode.NoError;
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position = curpos;
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if (! (p.Length == 0) )
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link = symbolicLink + SbUtils.PathString(p);
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else
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link = symbolicLink ;
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return false;
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}
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public override bool DeleteDirectory(StringBuilder! p,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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reparse = true;
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linkFound = true;
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error = ErrorCode.NoError;
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position = curpos;
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if (! (p.Length == 0) ) {
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link = symbolicLink + SbUtils.PathString(p);
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return false;
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}
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link = symbolicLink ;
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error = ErrorCode.NotDirectory;
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reparse = false;
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return false;
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}
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public override bool DeleteFile(StringBuilder! p,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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reparse = true;
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linkFound = true;
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error = ErrorCode.NoError;
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position = curpos;
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if (! (p.Length == 0) )
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link = symbolicLink + SbUtils.PathString(p);
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else
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link = symbolicLink ;
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return false;
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}
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public override bool DeleteLink(StringBuilder! p,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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reparse = true;
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linkFound = true;
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error = ErrorCode.NoError;
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position = curpos;
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if (! (p.Length == 0) )
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link = symbolicLink + SbUtils.PathString(p);
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else
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link = symbolicLink ;
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return false;
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}
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public override bool GetLinkValue(StringBuilder! p,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link
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)
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{
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reparse = true;
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linkFound = true;
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error = ErrorCode.NoError;
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position = curpos;
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// this is a traverse operation
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if (! (p.Length == 0) ) {
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link = symbolicLink + SbUtils.PathString(p);
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return false;
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}
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link = symbolicLink;
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return true;
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}
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public override bool QueryACL(StringBuilder! p,
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bool effective,
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Principal pr,
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int curpos,
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out int position,
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out bool linkFound,
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out ErrorCode error,
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out bool reparse,
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out string link,
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out Acl acl
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)
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{
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reparse = true;
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linkFound = true;
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error = ErrorCode.NoError;
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reparse = true;
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acl = new Acl();
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position = curpos;
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if (! (p.Length == 0))
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link = symbolicLink + SbUtils.PathString(p);
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else
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link = symbolicLink;
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return false;
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}
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public override bool StoreACL(StringBuilder! p,
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Principal pr,
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Acl acl,
|
||
|
|
int curpos,
|
||
|
|
out int position,
|
||
|
|
out bool linkFound,
|
||
|
|
out ErrorCode error,
|
||
|
|
out bool reparse,
|
||
|
|
out string link
|
||
|
|
)
|
||
|
|
{
|
||
|
|
reparse = true;
|
||
|
|
linkFound = true;
|
||
|
|
error = ErrorCode.NoError;
|
||
|
|
position = curpos;
|
||
|
|
|
||
|
|
if (! (p.Length == 0))
|
||
|
|
link = symbolicLink + SbUtils.PathString(p);
|
||
|
|
else
|
||
|
|
link = symbolicLink;
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|