464 lines
16 KiB
C++
464 lines
16 KiB
C++
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/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/base/win32filesystem.h"
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#include "webrtc/base/win32.h"
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#include <shellapi.h>
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#include <shlobj.h>
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#include <tchar.h>
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#include <memory>
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#include "webrtc/base/arraysize.h"
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#include "webrtc/base/fileutils.h"
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#include "webrtc/base/pathutils.h"
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#include "webrtc/base/stream.h"
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#include "webrtc/base/stringutils.h"
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// In several places in this file, we test the integrity level of the process
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// before calling GetLongPathName. We do this because calling GetLongPathName
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// when running under protected mode IE (a low integrity process) can result in
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// a virtualized path being returned, which is wrong if you only plan to read.
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// TODO: Waiting to hear back from IE team on whether this is the
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// best approach; IEIsProtectedModeProcess is another possible solution.
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namespace rtc {
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bool Win32Filesystem::CreateFolder(const Pathname &pathname) {
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if (pathname.pathname().empty() || !pathname.filename().empty())
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return false;
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std::wstring path16;
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if (!Utf8ToWindowsFilename(pathname.pathname(), &path16))
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return false;
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DWORD res = ::GetFileAttributes(path16.c_str());
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if (res != INVALID_FILE_ATTRIBUTES) {
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// Something exists at this location, check if it is a directory
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return ((res & FILE_ATTRIBUTE_DIRECTORY) != 0);
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} else if ((GetLastError() != ERROR_FILE_NOT_FOUND)
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&& (GetLastError() != ERROR_PATH_NOT_FOUND)) {
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// Unexpected error
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return false;
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}
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// Directory doesn't exist, look up one directory level
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if (!pathname.parent_folder().empty()) {
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Pathname parent(pathname);
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parent.SetFolder(pathname.parent_folder());
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if (!CreateFolder(parent)) {
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return false;
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}
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}
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return (::CreateDirectory(path16.c_str(), NULL) != 0);
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}
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FileStream *Win32Filesystem::OpenFile(const Pathname &filename,
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const std::string &mode) {
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FileStream *fs = new FileStream();
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if (fs && !fs->Open(filename.pathname().c_str(), mode.c_str(), NULL)) {
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delete fs;
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fs = NULL;
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}
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return fs;
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}
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bool Win32Filesystem::CreatePrivateFile(const Pathname &filename) {
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// To make the file private to the current user, we first must construct a
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// SECURITY_DESCRIPTOR specifying an ACL. This code is mostly based upon
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// http://msdn.microsoft.com/en-us/library/ms707085%28VS.85%29.aspx
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// Get the current process token.
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HANDLE process_token = INVALID_HANDLE_VALUE;
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if (!::OpenProcessToken(::GetCurrentProcess(),
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TOKEN_QUERY,
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&process_token)) {
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LOG_ERR(LS_ERROR) << "OpenProcessToken() failed";
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return false;
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}
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// Get the size of its TOKEN_USER structure. Return value is not checked
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// because we expect it to fail.
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DWORD token_user_size = 0;
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(void)::GetTokenInformation(process_token,
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TokenUser,
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NULL,
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0,
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&token_user_size);
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// Get the TOKEN_USER structure.
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std::unique_ptr<char[]> token_user_bytes(new char[token_user_size]);
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PTOKEN_USER token_user = reinterpret_cast<PTOKEN_USER>(
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token_user_bytes.get());
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memset(token_user, 0, token_user_size);
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BOOL success = ::GetTokenInformation(process_token,
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TokenUser,
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token_user,
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token_user_size,
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&token_user_size);
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// We're now done with this.
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::CloseHandle(process_token);
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if (!success) {
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LOG_ERR(LS_ERROR) << "GetTokenInformation() failed";
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return false;
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}
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if (!IsValidSid(token_user->User.Sid)) {
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LOG_ERR(LS_ERROR) << "Current process has invalid user SID";
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return false;
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}
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// Compute size needed for an ACL that allows access to just this user.
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int acl_size = sizeof(ACL) + sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD) +
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GetLengthSid(token_user->User.Sid);
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// Allocate it.
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std::unique_ptr<char[]> acl_bytes(new char[acl_size]);
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PACL acl = reinterpret_cast<PACL>(acl_bytes.get());
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memset(acl, 0, acl_size);
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if (!::InitializeAcl(acl, acl_size, ACL_REVISION)) {
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LOG_ERR(LS_ERROR) << "InitializeAcl() failed";
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return false;
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}
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// Allow access to only the current user.
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if (!::AddAccessAllowedAce(acl,
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ACL_REVISION,
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GENERIC_READ | GENERIC_WRITE | STANDARD_RIGHTS_ALL,
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token_user->User.Sid)) {
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LOG_ERR(LS_ERROR) << "AddAccessAllowedAce() failed";
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return false;
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}
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// Now make the security descriptor.
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SECURITY_DESCRIPTOR security_descriptor;
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if (!::InitializeSecurityDescriptor(&security_descriptor,
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SECURITY_DESCRIPTOR_REVISION)) {
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LOG_ERR(LS_ERROR) << "InitializeSecurityDescriptor() failed";
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return false;
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}
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// Put the ACL in it.
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if (!::SetSecurityDescriptorDacl(&security_descriptor,
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TRUE,
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acl,
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FALSE)) {
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LOG_ERR(LS_ERROR) << "SetSecurityDescriptorDacl() failed";
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return false;
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}
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// Finally create the file.
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SECURITY_ATTRIBUTES security_attributes;
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security_attributes.nLength = sizeof(security_attributes);
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security_attributes.lpSecurityDescriptor = &security_descriptor;
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security_attributes.bInheritHandle = FALSE;
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HANDLE handle = ::CreateFile(
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ToUtf16(filename.pathname()).c_str(),
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GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
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&security_attributes,
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CREATE_NEW,
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0,
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NULL);
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if (INVALID_HANDLE_VALUE == handle) {
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LOG_ERR(LS_ERROR) << "CreateFile() failed";
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return false;
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}
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if (!::CloseHandle(handle)) {
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LOG_ERR(LS_ERROR) << "CloseFile() failed";
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// Continue.
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}
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return true;
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}
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bool Win32Filesystem::DeleteFile(const Pathname &filename) {
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LOG(LS_INFO) << "Deleting file " << filename.pathname();
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if (!IsFile(filename)) {
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ASSERT(IsFile(filename));
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return false;
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}
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return ::DeleteFile(ToUtf16(filename.pathname()).c_str()) != 0;
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}
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bool Win32Filesystem::DeleteEmptyFolder(const Pathname &folder) {
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LOG(LS_INFO) << "Deleting folder " << folder.pathname();
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std::string no_slash(folder.pathname(), 0, folder.pathname().length()-1);
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return ::RemoveDirectory(ToUtf16(no_slash).c_str()) != 0;
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}
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bool Win32Filesystem::GetTemporaryFolder(Pathname &pathname, bool create,
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const std::string *append) {
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wchar_t buffer[MAX_PATH + 1];
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if (!::GetTempPath(arraysize(buffer), buffer))
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return false;
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if (!IsCurrentProcessLowIntegrity() &&
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!::GetLongPathName(buffer, buffer, arraysize(buffer)))
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return false;
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size_t len = strlen(buffer);
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if ((len > 0) && (buffer[len-1] != '\\')) {
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len += strcpyn(buffer + len, arraysize(buffer) - len, L"\\");
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}
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if (len >= arraysize(buffer) - 1)
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return false;
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pathname.clear();
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pathname.SetFolder(ToUtf8(buffer));
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if (append != NULL) {
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ASSERT(!append->empty());
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pathname.AppendFolder(*append);
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}
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return !create || CreateFolder(pathname);
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}
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std::string Win32Filesystem::TempFilename(const Pathname &dir,
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const std::string &prefix) {
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wchar_t filename[MAX_PATH];
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if (::GetTempFileName(ToUtf16(dir.pathname()).c_str(),
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ToUtf16(prefix).c_str(), 0, filename) != 0)
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return ToUtf8(filename);
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ASSERT(false);
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return "";
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}
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bool Win32Filesystem::MoveFile(const Pathname &old_path,
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const Pathname &new_path) {
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if (!IsFile(old_path)) {
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ASSERT(IsFile(old_path));
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return false;
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}
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LOG(LS_INFO) << "Moving " << old_path.pathname()
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<< " to " << new_path.pathname();
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return ::MoveFile(ToUtf16(old_path.pathname()).c_str(),
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ToUtf16(new_path.pathname()).c_str()) != 0;
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}
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bool Win32Filesystem::MoveFolder(const Pathname &old_path,
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const Pathname &new_path) {
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if (!IsFolder(old_path)) {
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ASSERT(IsFolder(old_path));
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return false;
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}
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LOG(LS_INFO) << "Moving " << old_path.pathname()
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<< " to " << new_path.pathname();
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if (::MoveFile(ToUtf16(old_path.pathname()).c_str(),
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ToUtf16(new_path.pathname()).c_str()) == 0) {
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if (::GetLastError() != ERROR_NOT_SAME_DEVICE) {
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LOG_GLE(LS_ERROR) << "Failed to move file";
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return false;
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}
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if (!CopyFolder(old_path, new_path))
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return false;
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if (!DeleteFolderAndContents(old_path))
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return false;
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}
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return true;
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}
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bool Win32Filesystem::IsFolder(const Pathname &path) {
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WIN32_FILE_ATTRIBUTE_DATA data = {0};
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if (0 == ::GetFileAttributesEx(ToUtf16(path.pathname()).c_str(),
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GetFileExInfoStandard, &data))
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return false;
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return (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ==
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FILE_ATTRIBUTE_DIRECTORY;
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}
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bool Win32Filesystem::IsFile(const Pathname &path) {
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WIN32_FILE_ATTRIBUTE_DATA data = {0};
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if (0 == ::GetFileAttributesEx(ToUtf16(path.pathname()).c_str(),
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GetFileExInfoStandard, &data))
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return false;
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return (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0;
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}
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bool Win32Filesystem::IsAbsent(const Pathname& path) {
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WIN32_FILE_ATTRIBUTE_DATA data = {0};
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if (0 != ::GetFileAttributesEx(ToUtf16(path.pathname()).c_str(),
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GetFileExInfoStandard, &data))
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return false;
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DWORD err = ::GetLastError();
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return (ERROR_FILE_NOT_FOUND == err || ERROR_PATH_NOT_FOUND == err);
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}
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bool Win32Filesystem::CopyFile(const Pathname &old_path,
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const Pathname &new_path) {
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return ::CopyFile(ToUtf16(old_path.pathname()).c_str(),
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ToUtf16(new_path.pathname()).c_str(), TRUE) != 0;
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}
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bool Win32Filesystem::IsTemporaryPath(const Pathname& pathname) {
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TCHAR buffer[MAX_PATH + 1];
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if (!::GetTempPath(arraysize(buffer), buffer))
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return false;
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if (!IsCurrentProcessLowIntegrity() &&
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!::GetLongPathName(buffer, buffer, arraysize(buffer)))
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return false;
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return (::strnicmp(ToUtf16(pathname.pathname()).c_str(),
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buffer, strlen(buffer)) == 0);
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}
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bool Win32Filesystem::GetFileSize(const Pathname &pathname, size_t *size) {
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WIN32_FILE_ATTRIBUTE_DATA data = {0};
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if (::GetFileAttributesEx(ToUtf16(pathname.pathname()).c_str(),
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GetFileExInfoStandard, &data) == 0)
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return false;
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*size = data.nFileSizeLow;
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return true;
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}
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bool Win32Filesystem::GetFileTime(const Pathname& path, FileTimeType which,
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time_t* time) {
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WIN32_FILE_ATTRIBUTE_DATA data = {0};
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if (::GetFileAttributesEx(ToUtf16(path.pathname()).c_str(),
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GetFileExInfoStandard, &data) == 0)
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return false;
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switch (which) {
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case FTT_CREATED:
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FileTimeToUnixTime(data.ftCreationTime, time);
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break;
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case FTT_MODIFIED:
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FileTimeToUnixTime(data.ftLastWriteTime, time);
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break;
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case FTT_ACCESSED:
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FileTimeToUnixTime(data.ftLastAccessTime, time);
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break;
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default:
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return false;
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}
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return true;
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}
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bool Win32Filesystem::GetAppPathname(Pathname* path) {
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TCHAR buffer[MAX_PATH + 1];
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if (0 == ::GetModuleFileName(NULL, buffer, arraysize(buffer)))
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return false;
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path->SetPathname(ToUtf8(buffer));
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return true;
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}
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bool Win32Filesystem::GetAppDataFolder(Pathname* path, bool per_user) {
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ASSERT(!organization_name_.empty());
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ASSERT(!application_name_.empty());
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TCHAR buffer[MAX_PATH + 1];
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int csidl = per_user ? CSIDL_LOCAL_APPDATA : CSIDL_COMMON_APPDATA;
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if (!::SHGetSpecialFolderPath(NULL, buffer, csidl, TRUE))
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return false;
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if (!IsCurrentProcessLowIntegrity() &&
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!::GetLongPathName(buffer, buffer, arraysize(buffer)))
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return false;
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|
|
size_t len = strcatn(buffer, arraysize(buffer), __T("\\"));
|
||
|
|
len += strcpyn(buffer + len, arraysize(buffer) - len,
|
||
|
|
ToUtf16(organization_name_).c_str());
|
||
|
|
if ((len > 0) && (buffer[len-1] != __T('\\'))) {
|
||
|
|
len += strcpyn(buffer + len, arraysize(buffer) - len, __T("\\"));
|
||
|
|
}
|
||
|
|
len += strcpyn(buffer + len, arraysize(buffer) - len,
|
||
|
|
ToUtf16(application_name_).c_str());
|
||
|
|
if ((len > 0) && (buffer[len-1] != __T('\\'))) {
|
||
|
|
len += strcpyn(buffer + len, arraysize(buffer) - len, __T("\\"));
|
||
|
|
}
|
||
|
|
if (len >= arraysize(buffer) - 1)
|
||
|
|
return false;
|
||
|
|
path->clear();
|
||
|
|
path->SetFolder(ToUtf8(buffer));
|
||
|
|
return CreateFolder(*path);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool Win32Filesystem::GetAppTempFolder(Pathname* path) {
|
||
|
|
if (!GetAppPathname(path))
|
||
|
|
return false;
|
||
|
|
std::string filename(path->filename());
|
||
|
|
return GetTemporaryFolder(*path, true, &filename);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool Win32Filesystem::GetDiskFreeSpace(const Pathname& path,
|
||
|
|
int64_t* free_bytes) {
|
||
|
|
if (!free_bytes) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
char drive[4];
|
||
|
|
std::wstring drive16;
|
||
|
|
const wchar_t* target_drive = NULL;
|
||
|
|
if (path.GetDrive(drive, sizeof(drive))) {
|
||
|
|
drive16 = ToUtf16(drive);
|
||
|
|
target_drive = drive16.c_str();
|
||
|
|
} else if (path.folder().substr(0, 2) == "\\\\") {
|
||
|
|
// UNC path, fail.
|
||
|
|
// TODO: Handle UNC paths.
|
||
|
|
return false;
|
||
|
|
} else {
|
||
|
|
// The path is probably relative. GetDriveType and GetDiskFreeSpaceEx
|
||
|
|
// use the current drive if NULL is passed as the drive name.
|
||
|
|
// TODO: Add method to Pathname to determine if the path is relative.
|
||
|
|
// TODO: Add method to Pathname to convert a path to absolute.
|
||
|
|
}
|
||
|
|
UINT drive_type = ::GetDriveType(target_drive);
|
||
|
|
if ((drive_type == DRIVE_REMOTE) || (drive_type == DRIVE_UNKNOWN)) {
|
||
|
|
LOG(LS_VERBOSE) << "Remote or unknown drive: " << drive;
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
int64_t total_number_of_bytes; // receives the number of bytes on disk
|
||
|
|
int64_t total_number_of_free_bytes; // receives the free bytes on disk
|
||
|
|
// make sure things won't change in 64 bit machine
|
||
|
|
// TODO replace with compile time assert
|
||
|
|
ASSERT(sizeof(ULARGE_INTEGER) == sizeof(uint64_t)); // NOLINT
|
||
|
|
if (::GetDiskFreeSpaceEx(target_drive,
|
||
|
|
(PULARGE_INTEGER)free_bytes,
|
||
|
|
(PULARGE_INTEGER)&total_number_of_bytes,
|
||
|
|
(PULARGE_INTEGER)&total_number_of_free_bytes)) {
|
||
|
|
return true;
|
||
|
|
} else {
|
||
|
|
LOG(LS_VERBOSE) << "GetDiskFreeSpaceEx returns error.";
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
Pathname Win32Filesystem::GetCurrentDirectory() {
|
||
|
|
Pathname cwd;
|
||
|
|
int path_len = 0;
|
||
|
|
std::unique_ptr<wchar_t[]> path;
|
||
|
|
do {
|
||
|
|
int needed = ::GetCurrentDirectory(path_len, path.get());
|
||
|
|
if (needed == 0) {
|
||
|
|
// Error.
|
||
|
|
LOG_GLE(LS_ERROR) << "::GetCurrentDirectory() failed";
|
||
|
|
return cwd; // returns empty pathname
|
||
|
|
}
|
||
|
|
if (needed <= path_len) {
|
||
|
|
// It wrote successfully.
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
// Else need to re-alloc for "needed".
|
||
|
|
path.reset(new wchar_t[needed]);
|
||
|
|
path_len = needed;
|
||
|
|
} while (true);
|
||
|
|
cwd.SetFolder(ToUtf8(path.get()));
|
||
|
|
return cwd;
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO: Consider overriding DeleteFolderAndContents for speed and potentially
|
||
|
|
// better OS integration (recycle bin?)
|
||
|
|
/*
|
||
|
|
std::wstring temp_path16 = ToUtf16(temp_path.pathname());
|
||
|
|
temp_path16.append(1, '*');
|
||
|
|
temp_path16.append(1, '\0');
|
||
|
|
|
||
|
|
SHFILEOPSTRUCT file_op = { 0 };
|
||
|
|
file_op.wFunc = FO_DELETE;
|
||
|
|
file_op.pFrom = temp_path16.c_str();
|
||
|
|
file_op.fFlags = FOF_NOCONFIRMATION | FOF_NOERRORUI | FOF_SILENT;
|
||
|
|
return (0 == SHFileOperation(&file_op));
|
||
|
|
*/
|
||
|
|
|
||
|
|
} // namespace rtc
|