826 lines
23 KiB
C++
826 lines
23 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (C) Microsoft Corporation, 2000
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//
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// File: nopin.cpp
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//
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//--------------------------------------------------------------------------
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#include "pch.h"
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#pragma hdrstop
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#include "eventlog.h"
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#include "nopin.h"
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#include "strings.h"
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#include "msg.h"
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//--------------------------------------------------------------------------
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// class CNoPinList
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//--------------------------------------------------------------------------
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CNoPinList::CNoPinList(
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void
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) : m_pRoot(NULL)
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{
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}
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CNoPinList::~CNoPinList(
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void
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)
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{
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delete m_pRoot;
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}
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//
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// Searches the tree for a COMPLETE path that is a subpath of
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// pszPath. If found, pszPath specifies a file or folder
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// that cannot be pinned.
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//
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// Returns:
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// S_OK - Pinning is allowed.
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// S_FALSE - Pinning is NOT allowed.
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// NOPIN_E_BADPATH - Path is not a valid UNC.
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//
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HRESULT
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CNoPinList::IsPinAllowed(
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LPCTSTR pszPath
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)
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{
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TraceEnter(TRACE_UTIL, "CNoPinList::IsPinAllowed");
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TraceAssert(NULL != pszPath);
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TraceAssert(!::IsBadStringPtr(pszPath, MAX_PATH));
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TraceAssert(::PathIsUNC(pszPath));
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HRESULT hr = _Initialize();
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if (SUCCEEDED(hr))
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{
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hr = S_OK;
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//
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// A quick optimization is to see if the tree is empty.
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// If it is, any file/folder may be pinned. This helps
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// performance when no pinning restriction is in place.
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//
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TraceAssert(NULL != m_pRoot);
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if (m_pRoot->HasChildren())
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{
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if (::PathIsUNC(pszPath))
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{
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//
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// SubPathExists modifies the path. Need to make a local copy.
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//
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TCHAR szPath[MAX_PATH];
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::lstrcpyn(szPath, pszPath, ARRAYSIZE(szPath));
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hr = m_pRoot->SubPathExists(szPath);
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if (S_FALSE == hr)
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{
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//
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// Absence from the tree means pinning is allowed.
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//
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hr = S_OK;
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}
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else if (S_OK == hr)
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{
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//
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// Presence in the tree means pinning is not allowed.
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//
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Trace((TEXT("Policy disallows pinning \"%s\""), pszPath));
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hr = S_FALSE;
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}
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}
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else
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{
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hr = NOPIN_E_BADPATH;
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}
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}
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}
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TraceAssert(S_OK == hr ||
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S_FALSE == hr ||
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NOPIN_E_BADPATH == hr);
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TraceLeaveResult(hr);
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}
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//
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// Quick check to see if ANY pin might be disallowed.
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// Returns:
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// S_OK - Tree has content.
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// S_FALSE - Tree is empty.
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//
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HRESULT
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CNoPinList::IsAnyPinDisallowed(
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void
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)
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{
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HRESULT hr = _Initialize();
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if (SUCCEEDED(hr))
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{
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TraceAssert(NULL != m_pRoot);
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hr = m_pRoot->HasChildren() ? S_OK : S_FALSE;
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}
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return hr;
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}
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//
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// Initializes the no-pin list by reading path strings from the
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// registry. The paths are stored in both HKLM and HKCU under
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// the following key:
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//
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// Software\Policies\Microsoft\Windows\NetCache\NoMakeAvailableOfflineList
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//
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// Path strings may contain environment variables.
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// Upon return the object contains a tree representing the union of all
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// files and folders listed in both registry keys.
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//
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// Errors in reading the registry result only in paths not being added
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// to the tree. No error is returned as a result of registry errors.
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// If an invalid UNC path is found in the registry, an even log entry
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// is recorded.
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//
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// Returns:
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// S_OK - List successfully loaded.
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// S_FALSE - List already initialized.
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// E_OUTOFMEMORY - Insufficient memory.
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// Other errors are possible.
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//
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HRESULT
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CNoPinList::_Initialize(
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void
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)
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{
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TraceEnter(TRACE_UTIL, "CNoPinList::_Initialize");
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HRESULT hr = S_OK;
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if (NULL != m_pRoot)
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{
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//
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// List is already initialized.
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//
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hr = S_FALSE;
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}
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else
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{
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m_pRoot = new CNode;
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if (NULL == m_pRoot)
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{
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hr = E_OUTOFMEMORY;
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}
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else
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{
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const HKEY rghkeyRoot[] = { HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE };
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TCHAR szKey[MAX_PATH];
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::wnsprintf(szKey,
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ARRAYSIZE(szKey),
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TEXT("%s\\%s"),
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REGSTR_KEY_OFFLINEFILESPOLICY,
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REGSTR_SUBKEY_NOMAKEAVAILABLEOFFLINELIST);
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for (int i = 0; SUCCEEDED(hr) && i < ARRAYSIZE(rghkeyRoot); i++)
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{
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HKEY hkey;
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LONG lResult = ::RegOpenKeyEx(rghkeyRoot[i],
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szKey,
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0,
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KEY_QUERY_VALUE,
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&hkey);
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if (ERROR_SUCCESS == lResult)
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{
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TCHAR szName[MAX_PATH];
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DWORD dwIndex = 0;
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DWORD cchName = ARRAYSIZE(szName);
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//
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// Enumerate the paths listed in the registry.
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//
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while (SUCCEEDED(hr) &&
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ERROR_SUCCESS == ::RegEnumValue(hkey,
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dwIndex,
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szName,
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&cchName,
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NULL,
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NULL,
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NULL,
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NULL))
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{
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//
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// Install the path string from the registry into the
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// tree. This function will expand any embedded environment strings
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// as well as convert mapped drive specs to remote UNC paths.
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//
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hr = _InitPathFromRegistry(szName);
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if (NOPIN_E_BADPATH == hr)
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{
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//
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// This is a special error. It means someone has
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// put bad data into the registry. "Bad" meaning
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// that the path is not or does not expand to a valid UNC
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// path string.
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// Write an event log entry to tell the admin. The
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// entry is generated at event logging level 1. I don't want
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// it filling up an event log under normal conditions but
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// I want an admin to figure it out in case their no-pin
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// policy appears to be not working.
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//
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// The MSG template is this (english):
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//
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// "The registry value '%1' in key '%2\%3' is not, or does not
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// expand to, a valid UNC path."
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//
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// We handle the error here because this is where we still have the
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// value read from the registry. We include that in the event
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// log entry so the admin can easily find it.
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//
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CscuiEventLog log;
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log.Push(szName);
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if (HKEY_LOCAL_MACHINE == rghkeyRoot[i])
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{
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log.Push(TEXT("HKEY_LOCAL_MACHINE"));
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}
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else
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{
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log.Push(TEXT("HKEY_CURRENT_USER"));
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}
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log.Push(szKey);
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log.ReportEvent(EVENTLOG_WARNING_TYPE, MSG_W_INVALID_UNCPATH_INREG, 1);
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//
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// We do not abort processing because of a bad reg value.
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//
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hr = S_OK;
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}
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cchName = ARRAYSIZE(szName);
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dwIndex++;
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}
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::RegCloseKey(hkey);
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hkey = NULL;
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}
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}
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}
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}
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TraceLeaveResult(hr);
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}
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//
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// Given a path string read from the registry, this function expands
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// any embedded environment strings, converts any mapped drive letters
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// to their corresponding remote UNC paths and installs the resulting
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// path string into the tree.
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//
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HRESULT
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CNoPinList::_InitPathFromRegistry(
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LPCTSTR pszPath
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)
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{
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TraceEnter(TRACE_UTIL, "CNoPinList::_InitPathFromRegistry");
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TraceAssert(NULL != pszPath);
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TraceAssert(!::IsBadStringPtr(pszPath, MAX_PATH));
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HRESULT hr = S_OK;
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TCHAR szNameExp[MAX_PATH]; // Expanded name string buffer.
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//
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// Expand any embedded environment strings.
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//
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if (0 == ::ExpandEnvironmentStrings(pszPath, szNameExp, ARRAYSIZE(szNameExp)))
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{
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const DWORD dwErr = GetLastError();
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hr = HRESULT_FROM_WIN32(dwErr);
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Trace((TEXT("Error %d expanding \"%s\""), dwErr, pszPath));
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}
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if (SUCCEEDED(hr))
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{
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LPCTSTR pszUncPath = NULL;
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LPTSTR pszRemotePath = NULL; // Created by GetRemotePath if necessary.
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//
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// Convert a common typing mistake.
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// Remember, these are reg entries. They could contain most anything.
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//
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for (LPTSTR s = szNameExp; *s; s++)
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{
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if (TEXT('/') == *s)
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{
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*s = TEXT('\\');
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}
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}
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if (::PathIsUNC(szNameExp))
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{
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//
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// Path is a UNC path. We're golden.
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//
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pszUncPath = szNameExp;
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}
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else
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{
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//
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// Path is probably a mapped drive.
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// Get its remote UNC path. This API returns S_FALSE
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// if the remote drive is not connected or if it's a local drive.
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//
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hr = ::GetRemotePath(szNameExp, &pszRemotePath);
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if (SUCCEEDED(hr))
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{
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if (S_OK == hr)
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{
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pszUncPath = pszRemotePath;
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}
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else if (S_FALSE == hr)
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{
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//
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// Path was either to a local drive or to a net drive that
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// isn't connected. Either way it's an invalid drive that
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// won't be considered in the no-pin logic. Use the expanded
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// value from the registry and pass that through to AddPath()
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// where it will be rejected as an invalid UNC path.
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//
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TraceAssert(NULL == pszRemotePath);
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pszUncPath = szNameExp;
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hr = S_OK;
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}
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}
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}
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if (SUCCEEDED(hr))
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{
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TraceAssert(NULL != pszUncPath);
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TraceAssert(pszUncPath == szNameExp || pszUncPath == pszRemotePath);
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//
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// Insert the UNC path into the tree.
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// At this point, a path may or may not be UNC. _AddPath()
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// will verify this.
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//
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hr = _AddPath(pszUncPath);
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}
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if (NULL != pszRemotePath)
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{
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::LocalFree(pszRemotePath);
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}
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}
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TraceLeaveResult(hr);
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}
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//
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// Adds a path to the tree. If this is a sub-path of an existing
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// path in the tree, the remainder of the existing path is removed
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// from the tree.
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//
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// Returns:
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// S_OK - Path successfully added.
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// E_OUTOFMEMORY - Insufficient memory.
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// NOPIN_E_BADPATH - Invalid path string. Not a UNC.
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//
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HRESULT
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CNoPinList::_AddPath(
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LPCTSTR pszPath
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)
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{
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TraceAssert(NULL != pszPath);
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TraceAssert(!::IsBadStringPtr(pszPath, MAX_PATH));
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HRESULT hr = NOPIN_E_BADPATH;
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if (::PathIsUNC(pszPath))
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{
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//
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// AddPath modifies the path. Need to make a local copy.
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//
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TraceAssert(NULL != m_pRoot);
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TCHAR szPath[MAX_PATH];
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::lstrcpyn(szPath, pszPath, ARRAYSIZE(szPath));
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hr = m_pRoot->AddPath(szPath);
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}
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TraceAssert(S_OK == hr ||
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E_OUTOFMEMORY == hr ||
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NOPIN_E_BADPATH == hr);
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return hr;
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}
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//--------------------------------------------------------------------------
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// class CNoPinList::CNode
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//--------------------------------------------------------------------------
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CNoPinList::CNode::~CNode(
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void
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)
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{
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if (NULL != m_pszName)
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{
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::LocalFree(m_pszName);
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}
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delete m_pChildren;
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delete m_pNext;
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}
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//
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// Initializes a node's name value.
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//
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HRESULT
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CNoPinList::CNode::Initialize(
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LPCTSTR pszName
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)
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{
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TraceAssert(NULL != pszName);
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TraceAssert(!::IsBadStringPtr(pszName, MAX_PATH));
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TraceAssert(NULL == m_pszName);
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HRESULT hr = E_OUTOFMEMORY;
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m_pszName = (LPTSTR)::LocalAlloc(LPTR, (::lstrlen(pszName) + 1) * sizeof(*pszName));
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if (NULL != m_pszName)
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{
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::lstrcpy(m_pszName, pszName);
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hr = S_OK;
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}
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return hr;
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}
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//
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// Add a child, keeping the children in alphabetical
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// order by name. We trade a little time during creation
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// for the speed benefits during lookup.
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//
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void
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CNoPinList::CNode::_AddChild(
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CNode *pChild
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)
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{
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TraceAssert(NULL != pChild);
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CNode **ppNode = &m_pChildren;
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while(NULL != *ppNode)
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{
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CNode *pNode = *ppNode;
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//
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// Find the alphabetical insertion point.
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//
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TraceAssert(NULL != pNode->m_pszName);
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TraceAssert(!::IsBadStringPtr(pNode->m_pszName, MAX_PATH));
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TraceAssert(NULL != pChild->m_pszName);
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TraceAssert(!::IsBadStringPtr(pChild->m_pszName, MAX_PATH));
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int diff = ::lstrcmpi(pChild->m_pszName, pNode->m_pszName);
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if (0 == diff)
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{
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//
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// Child already exists. Don't allow duplicates.
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//
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return;
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}
|
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if (diff < 0)
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{
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//
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// The new child is alphabetically "greater" than the currently
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// visited node.
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// Exit the loop with ppNode pointing to the pointer variable
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// where we'll put the address of pChild.
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//
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break;
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}
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else
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{
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//
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// Advance to the next node in the list.
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//
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ppNode = &pNode->m_pNext;
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}
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}
|
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//
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// Insert the child.
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//
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pChild->m_pNext = *ppNode;
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*ppNode = pChild;
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}
|
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|
|
|
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//
|
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// Locates a child node in a node's list of children.
|
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// Comparison is by node name.
|
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// Returns the address of the node if found. NULL otherwise.
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//
|
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CNoPinList::CNode *
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CNoPinList::CNode::_FindChild(
|
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LPCTSTR pszName
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) const
|
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{
|
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TraceAssert(NULL != pszName);
|
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TraceAssert(!::IsBadStringPtr(pszName, MAX_PATH));
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|
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CNode *pChild = NULL;
|
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for (CNode *pNode = m_pChildren; pNode; pNode = pNode->m_pNext)
|
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{
|
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//
|
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// The list is sorted alphabetically.
|
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//
|
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int diff = ::lstrcmpi(pszName, pNode->m_pszName);
|
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if (diff <= 0)
|
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{
|
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//
|
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// Either we found a match or we've passed all possible
|
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// matches.
|
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//
|
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if (0 == diff)
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{
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//
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// Exact match.
|
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//
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pChild = pNode;
|
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}
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break;
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}
|
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}
|
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return pChild;
|
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}
|
|
|
|
|
|
|
|
//
|
|
// Given "\\brianau1\public\bin"
|
|
// Returns address of "brianau1\public\bin", with *pcchComponent == 8.
|
|
//
|
|
// Given "public\bin"
|
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// Returns address of "bin", with *pcchComponent == 3.
|
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//
|
|
LPCTSTR
|
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CNoPinList::CNode::_FindNextPathComponent( // [static]
|
|
LPCTSTR pszPath,
|
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int *pcchComponent // [optional] Can be NULL.
|
|
)
|
|
{
|
|
TraceAssert(NULL != pszPath);
|
|
TraceAssert(!::IsBadStringPtr(pszPath, MAX_PATH));
|
|
|
|
LPCTSTR pszBegin = pszPath;
|
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|
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const TCHAR CH_BS = TEXT('\\');
|
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//
|
|
// Skip any leading backslashes.
|
|
//
|
|
while(*pszBegin && CH_BS == *pszBegin)
|
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++pszBegin;
|
|
|
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//
|
|
// Find the end of the path component.
|
|
//
|
|
LPCTSTR pszEnd = pszBegin;
|
|
while(*pszEnd && CH_BS != *pszEnd)
|
|
++pszEnd;
|
|
|
|
if (NULL != pcchComponent)
|
|
{
|
|
*pcchComponent = int(pszEnd - pszBegin);
|
|
TraceAssert(0 <= *pcchComponent);
|
|
}
|
|
|
|
//
|
|
// Validate the final position of the begin and end ptrs.
|
|
//
|
|
TraceAssert(NULL != pszBegin);
|
|
TraceAssert(NULL != pszEnd);
|
|
TraceAssert(pszBegin >= pszPath);
|
|
TraceAssert(pszBegin <= (pszPath + lstrlen(pszPath)));
|
|
TraceAssert(pszEnd >= pszPath);
|
|
TraceAssert(pszEnd <= (pszPath + lstrlen(pszPath)));
|
|
TraceAssert(TEXT('\\') != *pszBegin);
|
|
return pszBegin;
|
|
}
|
|
|
|
|
|
//
|
|
// Recursively adds components of a path string to the tree.
|
|
//
|
|
HRESULT
|
|
CNoPinList::CNode::AddPath(
|
|
LPTSTR pszPath
|
|
)
|
|
{
|
|
TraceAssert(NULL != pszPath);
|
|
TraceAssert(!::IsBadStringPtr(pszPath, MAX_PATH));
|
|
|
|
HRESULT hr = NOPIN_E_BADPATH;
|
|
if (NULL != pszPath)
|
|
{
|
|
hr = S_OK;
|
|
|
|
int cchPart = 0;
|
|
LPTSTR pszPart = (LPTSTR)_FindNextPathComponent(pszPath, &cchPart);
|
|
if (*pszPart)
|
|
{
|
|
TCHAR chTemp = TEXT('\0');
|
|
_SwapChars(&chTemp, pszPart + cchPart);
|
|
CNode *pChild = _FindChild(pszPart);
|
|
|
|
if (NULL != pChild)
|
|
{
|
|
//
|
|
// Found an existing node for this part of the path.
|
|
// If the node has children, give the remainder of the path
|
|
// to this node for addition. If it doesn't that means
|
|
// it's a leaf node and all it's children are excluded from
|
|
// pinning. No reason to add any children to it.
|
|
//
|
|
_SwapChars(&chTemp, pszPart + cchPart);
|
|
if (pChild->HasChildren())
|
|
{
|
|
hr = pChild->AddPath(pszPart + cchPart);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// This is a new sub-path that is not yet in the tree.
|
|
//
|
|
hr = E_OUTOFMEMORY;
|
|
|
|
pChild = new CNode();
|
|
if (NULL != pChild)
|
|
{
|
|
//
|
|
// Initialize the new child.
|
|
//
|
|
hr = pChild->Initialize(pszPart);
|
|
_SwapChars(&chTemp, pszPart + cchPart);
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// Have the new child add the remainder of
|
|
// the path as it's children.
|
|
//
|
|
hr = pChild->AddPath(pszPart + cchPart);
|
|
if (SUCCEEDED(hr))
|
|
{
|
|
//
|
|
// Link the new child into the list of children.
|
|
//
|
|
_AddChild(pChild);
|
|
}
|
|
}
|
|
if (FAILED(hr))
|
|
{
|
|
delete pChild;
|
|
pChild = NULL;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// We're at the end of the path, that means we're at a leaf node
|
|
// and this file or directory is excluded from pinning. If it's
|
|
// a directory, all children are excluded from pinning so there's
|
|
// no reason to keep any child nodes in the tree. This keeps the
|
|
// tree trimmed to a minimum necessary size.
|
|
//
|
|
delete m_pChildren;
|
|
m_pChildren = NULL;
|
|
}
|
|
}
|
|
|
|
TraceAssert(S_OK == hr ||
|
|
E_OUTOFMEMORY == hr ||
|
|
NOPIN_E_BADPATH == hr);
|
|
return hr;
|
|
}
|
|
|
|
|
|
//
|
|
// Recursively determines if a given complete subpath exists for a
|
|
// path string. If a match occurs at a given level in the tree,
|
|
// the remainder of the path string is given to the matching node
|
|
// for further searching. This process continues recursively until
|
|
// we hit a leaf node in the tree or the end of the path string,
|
|
// whichever occurs first.
|
|
//
|
|
// Returns:
|
|
// S_OK - A complete path exists that is a subpath of pszPath.
|
|
// S_FALSE - A complete path does not exist.
|
|
//
|
|
HRESULT
|
|
CNoPinList::CNode::SubPathExists(
|
|
LPTSTR pszPath
|
|
) const
|
|
{
|
|
HRESULT hr = NOPIN_E_BADPATH;
|
|
if (NULL != pszPath)
|
|
{
|
|
hr = S_FALSE;
|
|
|
|
int cchPart = 0;
|
|
LPTSTR pszPart = (LPTSTR)_FindNextPathComponent(pszPath, &cchPart);
|
|
if (*pszPart)
|
|
{
|
|
TCHAR chTemp = TEXT('\0');
|
|
|
|
_SwapChars(&chTemp, pszPart + cchPart);
|
|
CNode *pChild = _FindChild(pszPart);
|
|
_SwapChars(&chTemp, pszPart + cchPart);
|
|
|
|
if (NULL != pChild)
|
|
{
|
|
if (pChild->HasChildren())
|
|
{
|
|
hr = pChild->SubPathExists(pszPart + cchPart);
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// Hit a leaf node. That means that we've traversed
|
|
// down a complete subpath of the path in question.
|
|
// Pinning of this path is not allowed.
|
|
//
|
|
hr = S_OK;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
TraceAssert(S_OK == hr ||
|
|
S_FALSE == hr ||
|
|
NOPIN_E_BADPATH == hr);
|
|
return hr;
|
|
}
|
|
|
|
|
|
|
|
#if DBG
|
|
|
|
//
|
|
// This function dumps the contents of a tree node and all it's decendents.
|
|
// The result is an indented list of nodes in the debugger output.
|
|
// Handy for debugging tree build problems.
|
|
//
|
|
void
|
|
CNoPinList::_DumpNode(
|
|
const CNoPinList::CNode *pNode,
|
|
int iIndent
|
|
)
|
|
{
|
|
CNodeInspector ni(pNode);
|
|
TCHAR szText[1024] = {0};
|
|
|
|
LPTSTR pszWrite = szText;
|
|
for (int i = 0; i < iIndent; i++)
|
|
{
|
|
::lstrcat(szText, TEXT(" "));
|
|
pszWrite++;
|
|
}
|
|
|
|
::OutputDebugString(TEXT("\n\r"));
|
|
::wsprintf(pszWrite, TEXT("Node Address.: 0x%08X\n\r"), pNode);
|
|
::OutputDebugString(szText);
|
|
::wsprintf(pszWrite, TEXT("Name.........: %s\n\r"), ni.NodeName() ? ni.NodeName() : TEXT("<null>"));
|
|
::OutputDebugString(szText);
|
|
::wsprintf(pszWrite, TEXT("Children.....: 0x%08X\n\r"), ni.ChildList());
|
|
::OutputDebugString(szText);
|
|
::wsprintf(pszWrite, TEXT("Next Sibling.: 0x%08X\n\r"), ni.NextSibling());
|
|
::OutputDebugString(szText);
|
|
|
|
if (NULL != ni.ChildList())
|
|
{
|
|
_DumpNode(ni.ChildList(), iIndent + 5);
|
|
}
|
|
if (NULL != ni.NextSibling())
|
|
{
|
|
_DumpNode(ni.NextSibling(), iIndent);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Dump the entire tree starting with the root.
|
|
//
|
|
void
|
|
CNoPinList::Dump(
|
|
void
|
|
)
|
|
{
|
|
::OutputDebugString(TEXT("\n\rDumping CNoPinList\n\r"));
|
|
if (NULL != m_pRoot)
|
|
{
|
|
_DumpNode(m_pRoot, 0);
|
|
}
|
|
}
|
|
|
|
#endif // DBG
|
|
|
|
|