blob: 84574032e6892ad0f09bf7989be412cb9e47bc33 [file] [log] [blame]
/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/base/win32filesystem.h"
#include "webrtc/base/win32.h"
#include <shellapi.h>
#include <shlobj.h>
#include <tchar.h>
#include <memory>
#include "webrtc/base/arraysize.h"
#include "webrtc/base/fileutils.h"
#include "webrtc/base/pathutils.h"
#include "webrtc/base/stream.h"
#include "webrtc/base/stringutils.h"
// In several places in this file, we test the integrity level of the process
// before calling GetLongPathName. We do this because calling GetLongPathName
// when running under protected mode IE (a low integrity process) can result in
// a virtualized path being returned, which is wrong if you only plan to read.
// TODO: Waiting to hear back from IE team on whether this is the
// best approach; IEIsProtectedModeProcess is another possible solution.
namespace rtc {
bool Win32Filesystem::CreateFolder(const Pathname &pathname) {
if (pathname.pathname().empty() || !pathname.filename().empty())
return false;
std::wstring path16;
if (!Utf8ToWindowsFilename(pathname.pathname(), &path16))
return false;
DWORD res = ::GetFileAttributes(path16.c_str());
if (res != INVALID_FILE_ATTRIBUTES) {
// Something exists at this location, check if it is a directory
return ((res & FILE_ATTRIBUTE_DIRECTORY) != 0);
} else if ((GetLastError() != ERROR_FILE_NOT_FOUND)
&& (GetLastError() != ERROR_PATH_NOT_FOUND)) {
// Unexpected error
return false;
}
// Directory doesn't exist, look up one directory level
if (!pathname.parent_folder().empty()) {
Pathname parent(pathname);
parent.SetFolder(pathname.parent_folder());
if (!CreateFolder(parent)) {
return false;
}
}
return (::CreateDirectory(path16.c_str(), NULL) != 0);
}
FileStream *Win32Filesystem::OpenFile(const Pathname &filename,
const std::string &mode) {
FileStream *fs = new FileStream();
if (fs && !fs->Open(filename.pathname().c_str(), mode.c_str(), NULL)) {
delete fs;
fs = NULL;
}
return fs;
}
bool Win32Filesystem::CreatePrivateFile(const Pathname &filename) {
// To make the file private to the current user, we first must construct a
// SECURITY_DESCRIPTOR specifying an ACL. This code is mostly based upon
// http://msdn.microsoft.com/en-us/library/ms707085%28VS.85%29.aspx
// Get the current process token.
HANDLE process_token = INVALID_HANDLE_VALUE;
if (!::OpenProcessToken(::GetCurrentProcess(),
TOKEN_QUERY,
&process_token)) {
LOG_ERR(LS_ERROR) << "OpenProcessToken() failed";
return false;
}
// Get the size of its TOKEN_USER structure. Return value is not checked
// because we expect it to fail.
DWORD token_user_size = 0;
(void)::GetTokenInformation(process_token,
TokenUser,
NULL,
0,
&token_user_size);
// Get the TOKEN_USER structure.
std::unique_ptr<char[]> token_user_bytes(new char[token_user_size]);
PTOKEN_USER token_user = reinterpret_cast<PTOKEN_USER>(
token_user_bytes.get());
memset(token_user, 0, token_user_size);
BOOL success = ::GetTokenInformation(process_token,
TokenUser,
token_user,
token_user_size,
&token_user_size);
// We're now done with this.
::CloseHandle(process_token);
if (!success) {
LOG_ERR(LS_ERROR) << "GetTokenInformation() failed";
return false;
}
if (!IsValidSid(token_user->User.Sid)) {
LOG_ERR(LS_ERROR) << "Current process has invalid user SID";
return false;
}
// Compute size needed for an ACL that allows access to just this user.
int acl_size = sizeof(ACL) + sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD) +
GetLengthSid(token_user->User.Sid);
// Allocate it.
std::unique_ptr<char[]> acl_bytes(new char[acl_size]);
PACL acl = reinterpret_cast<PACL>(acl_bytes.get());
memset(acl, 0, acl_size);
if (!::InitializeAcl(acl, acl_size, ACL_REVISION)) {
LOG_ERR(LS_ERROR) << "InitializeAcl() failed";
return false;
}
// Allow access to only the current user.
if (!::AddAccessAllowedAce(acl,
ACL_REVISION,
GENERIC_READ | GENERIC_WRITE | STANDARD_RIGHTS_ALL,
token_user->User.Sid)) {
LOG_ERR(LS_ERROR) << "AddAccessAllowedAce() failed";
return false;
}
// Now make the security descriptor.
SECURITY_DESCRIPTOR security_descriptor;
if (!::InitializeSecurityDescriptor(&security_descriptor,
SECURITY_DESCRIPTOR_REVISION)) {
LOG_ERR(LS_ERROR) << "InitializeSecurityDescriptor() failed";
return false;
}
// Put the ACL in it.
if (!::SetSecurityDescriptorDacl(&security_descriptor,
TRUE,
acl,
FALSE)) {
LOG_ERR(LS_ERROR) << "SetSecurityDescriptorDacl() failed";
return false;
}
// Finally create the file.
SECURITY_ATTRIBUTES security_attributes;
security_attributes.nLength = sizeof(security_attributes);
security_attributes.lpSecurityDescriptor = &security_descriptor;
security_attributes.bInheritHandle = FALSE;
HANDLE handle = ::CreateFile(
ToUtf16(filename.pathname()).c_str(),
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
&security_attributes,
CREATE_NEW,
0,
NULL);
if (INVALID_HANDLE_VALUE == handle) {
LOG_ERR(LS_ERROR) << "CreateFile() failed";
return false;
}
if (!::CloseHandle(handle)) {
LOG_ERR(LS_ERROR) << "CloseFile() failed";
// Continue.
}
return true;
}
bool Win32Filesystem::DeleteFile(const Pathname &filename) {
LOG(LS_INFO) << "Deleting file " << filename.pathname();
if (!IsFile(filename)) {
ASSERT(IsFile(filename));
return false;
}
return ::DeleteFile(ToUtf16(filename.pathname()).c_str()) != 0;
}
bool Win32Filesystem::DeleteEmptyFolder(const Pathname &folder) {
LOG(LS_INFO) << "Deleting folder " << folder.pathname();
std::string no_slash(folder.pathname(), 0, folder.pathname().length()-1);
return ::RemoveDirectory(ToUtf16(no_slash).c_str()) != 0;
}
bool Win32Filesystem::GetTemporaryFolder(Pathname &pathname, bool create,
const std::string *append) {
wchar_t buffer[MAX_PATH + 1];
if (!::GetTempPath(arraysize(buffer), buffer))
return false;
if (!IsCurrentProcessLowIntegrity() &&
!::GetLongPathName(buffer, buffer, arraysize(buffer)))
return false;
size_t len = strlen(buffer);
if ((len > 0) && (buffer[len-1] != '\\')) {
len += strcpyn(buffer + len, arraysize(buffer) - len, L"\\");
}
if (len >= arraysize(buffer) - 1)
return false;
pathname.clear();
pathname.SetFolder(ToUtf8(buffer));
if (append != NULL) {
ASSERT(!append->empty());
pathname.AppendFolder(*append);
}
return !create || CreateFolder(pathname);
}
std::string Win32Filesystem::TempFilename(const Pathname &dir,
const std::string &prefix) {
wchar_t filename[MAX_PATH];
if (::GetTempFileName(ToUtf16(dir.pathname()).c_str(),
ToUtf16(prefix).c_str(), 0, filename) != 0)
return ToUtf8(filename);
ASSERT(false);
return "";
}
bool Win32Filesystem::MoveFile(const Pathname &old_path,
const Pathname &new_path) {
if (!IsFile(old_path)) {
ASSERT(IsFile(old_path));
return false;
}
LOG(LS_INFO) << "Moving " << old_path.pathname()
<< " to " << new_path.pathname();
return ::MoveFile(ToUtf16(old_path.pathname()).c_str(),
ToUtf16(new_path.pathname()).c_str()) != 0;
}
bool Win32Filesystem::MoveFolder(const Pathname &old_path,
const Pathname &new_path) {
if (!IsFolder(old_path)) {
ASSERT(IsFolder(old_path));
return false;
}
LOG(LS_INFO) << "Moving " << old_path.pathname()
<< " to " << new_path.pathname();
if (::MoveFile(ToUtf16(old_path.pathname()).c_str(),
ToUtf16(new_path.pathname()).c_str()) == 0) {
if (::GetLastError() != ERROR_NOT_SAME_DEVICE) {
LOG_GLE(LS_ERROR) << "Failed to move file";
return false;
}
if (!CopyFolder(old_path, new_path))
return false;
if (!DeleteFolderAndContents(old_path))
return false;
}
return true;
}
bool Win32Filesystem::IsFolder(const Pathname &path) {
WIN32_FILE_ATTRIBUTE_DATA data = {0};
if (0 == ::GetFileAttributesEx(ToUtf16(path.pathname()).c_str(),
GetFileExInfoStandard, &data))
return false;
return (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ==
FILE_ATTRIBUTE_DIRECTORY;
}
bool Win32Filesystem::IsFile(const Pathname &path) {
WIN32_FILE_ATTRIBUTE_DATA data = {0};
if (0 == ::GetFileAttributesEx(ToUtf16(path.pathname()).c_str(),
GetFileExInfoStandard, &data))
return false;
return (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0;
}
bool Win32Filesystem::IsAbsent(const Pathname& path) {
WIN32_FILE_ATTRIBUTE_DATA data = {0};
if (0 != ::GetFileAttributesEx(ToUtf16(path.pathname()).c_str(),
GetFileExInfoStandard, &data))
return false;
DWORD err = ::GetLastError();
return (ERROR_FILE_NOT_FOUND == err || ERROR_PATH_NOT_FOUND == err);
}
bool Win32Filesystem::CopyFile(const Pathname &old_path,
const Pathname &new_path) {
return ::CopyFile(ToUtf16(old_path.pathname()).c_str(),
ToUtf16(new_path.pathname()).c_str(), TRUE) != 0;
}
bool Win32Filesystem::IsTemporaryPath(const Pathname& pathname) {
TCHAR buffer[MAX_PATH + 1];
if (!::GetTempPath(arraysize(buffer), buffer))
return false;
if (!IsCurrentProcessLowIntegrity() &&
!::GetLongPathName(buffer, buffer, arraysize(buffer)))
return false;
return (::strnicmp(ToUtf16(pathname.pathname()).c_str(),
buffer, strlen(buffer)) == 0);
}
bool Win32Filesystem::GetFileSize(const Pathname &pathname, size_t *size) {
WIN32_FILE_ATTRIBUTE_DATA data = {0};
if (::GetFileAttributesEx(ToUtf16(pathname.pathname()).c_str(),
GetFileExInfoStandard, &data) == 0)
return false;
*size = data.nFileSizeLow;
return true;
}
bool Win32Filesystem::GetFileTime(const Pathname& path, FileTimeType which,
time_t* time) {
WIN32_FILE_ATTRIBUTE_DATA data = {0};
if (::GetFileAttributesEx(ToUtf16(path.pathname()).c_str(),
GetFileExInfoStandard, &data) == 0)
return false;
switch (which) {
case FTT_CREATED:
FileTimeToUnixTime(data.ftCreationTime, time);
break;
case FTT_MODIFIED:
FileTimeToUnixTime(data.ftLastWriteTime, time);
break;
case FTT_ACCESSED:
FileTimeToUnixTime(data.ftLastAccessTime, time);
break;
default:
return false;
}
return true;
}
bool Win32Filesystem::GetAppPathname(Pathname* path) {
TCHAR buffer[MAX_PATH + 1];
if (0 == ::GetModuleFileName(NULL, buffer, arraysize(buffer)))
return false;
path->SetPathname(ToUtf8(buffer));
return true;
}
bool Win32Filesystem::GetAppDataFolder(Pathname* path, bool per_user) {
ASSERT(!organization_name_.empty());
ASSERT(!application_name_.empty());
TCHAR buffer[MAX_PATH + 1];
int csidl = per_user ? CSIDL_LOCAL_APPDATA : CSIDL_COMMON_APPDATA;
if (!::SHGetSpecialFolderPath(NULL, buffer, csidl, TRUE))
return false;
if (!IsCurrentProcessLowIntegrity() &&
!::GetLongPathName(buffer, buffer, arraysize(buffer)))
return false;
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