installed pty

[VSoRC/.git] / node_modules / node-pty / deps / winpty / src / shared / BackgroundDesktop.cc

diff --git a/node_modules/node-pty/deps/winpty/src/shared/BackgroundDesktop.cc b/node_modules/node-pty/deps/winpty/src/shared/BackgroundDesktop.cc
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+++ b/node_modules/node-pty/deps/winpty/src/shared/BackgroundDesktop.cc
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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);
+}