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// Copyright (c) 2011-2016 Ryan Prichard
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
#include "BackgroundDesktop.h"
#include <memory>
#include "DebugClient.h"
#include "StringUtil.h"
#include "WinptyException.h"
namespace {
static std::wstring getObjectName(HANDLE object) {
BOOL success;
DWORD lengthNeeded = 0;
GetUserObjectInformationW(object, UOI_NAME,
nullptr, 0,
&lengthNeeded);
ASSERT(lengthNeeded % sizeof(wchar_t) == 0);
std::unique_ptr<wchar_t[]> tmp(
new wchar_t[lengthNeeded / sizeof(wchar_t)]);
success = GetUserObjectInformationW(object, UOI_NAME,
tmp.get(), lengthNeeded,
nullptr);
if (!success) {
throwWindowsError(L"GetUserObjectInformationW failed");
}
return std::wstring(tmp.get());
}
static std::wstring getDesktopName(HWINSTA winsta, HDESK desk) {
return getObjectName(winsta) + L"\\" + getObjectName(desk);
}
} // anonymous namespace
// Get a non-interactive window station for the agent.
// TODO: review security w.r.t. windowstation and desktop.
BackgroundDesktop::BackgroundDesktop() {
try {
m_originalStation = GetProcessWindowStation();
if (m_originalStation == nullptr) {
throwWindowsError(
L"BackgroundDesktop ctor: "
L"GetProcessWindowStation returned NULL");
}
m_newStation =
CreateWindowStationW(nullptr, 0, WINSTA_ALL_ACCESS, nullptr);
if (m_newStation == nullptr) {
throwWindowsError(
L"BackgroundDesktop ctor: CreateWindowStationW returned NULL");
}
if (!SetProcessWindowStation(m_newStation)) {
throwWindowsError(
L"BackgroundDesktop ctor: SetProcessWindowStation failed");
}
m_newDesktop = CreateDesktopW(
L"Default", nullptr, nullptr, 0, GENERIC_ALL, nullptr);
if (m_newDesktop == nullptr) {
throwWindowsError(
L"BackgroundDesktop ctor: CreateDesktopW failed");
}
m_newDesktopName = getDesktopName(m_newStation, m_newDesktop);
TRACE("Created background desktop: %s",
utf8FromWide(m_newDesktopName).c_str());
} catch (...) {
dispose();
throw;
}
}
void BackgroundDesktop::dispose() WINPTY_NOEXCEPT {
if (m_originalStation != nullptr) {
SetProcessWindowStation(m_originalStation);
m_originalStation = nullptr;
}
if (m_newDesktop != nullptr) {
CloseDesktop(m_newDesktop);
m_newDesktop = nullptr;
}
if (m_newStation != nullptr) {
CloseWindowStation(m_newStation);
m_newStation = nullptr;
}
}
std::wstring getCurrentDesktopName() {
// MSDN says that the handles returned by GetProcessWindowStation and
// GetThreadDesktop do not need to be passed to CloseWindowStation and
// CloseDesktop, respectively.
const HWINSTA winsta = GetProcessWindowStation();
if (winsta == nullptr) {
throwWindowsError(
L"getCurrentDesktopName: "
L"GetProcessWindowStation returned NULL");
}
const HDESK desk = GetThreadDesktop(GetCurrentThreadId());
if (desk == nullptr) {
throwWindowsError(
L"getCurrentDesktopName: "
L"GetThreadDesktop returned NULL");
}
return getDesktopName(winsta, desk);
}
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