--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/packaging/desktopshellrun.cpp	Tue Sep 16 19:45:19 2014 +0200
@@ -0,0 +1,326 @@
+/* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
+ * Software engineering by Intevation GmbH
+ *
+ * This file is Free Software under the GNU GPL (v>=2)
+ * and comes with ABSOLUTELY NO WARRANTY!
+ * See LICENSE.txt for details.
+ */
+
+/**
+ * @file tasksched_run_as.cpp
+ * @brief Run a command with the Task Scheduler API
+ *
+ * This effectively starts a program as the user regardles of the current
+ * process token.
+ */
+#include <windows.h>
+#include "logging.h"
+#include "strhelp.h"
+
+#ifndef INITGUID
+#define INITGUID
+#endif
+
+#include <initguid.h>
+#include <mstask.h>
+#include <wchar.h>
+#include <ole2.h>
+#include <shldisp.h>
+#include <shobjidl.h>
+#include <exdisp.h>
+#include <shlguid.h>
+
+/* Some declarations missing in mingw-w64 3.1.0 taken from msdn */
+
+__CRT_UUID_DECL(IShellWindows, 0x85CB6900, 0x4D95, 0x11CF,
+                0x96, 0x0C, 0x00, 0x80, 0xC7, 0xF4, 0xEE, 0x85);
+
+DEFINE_GUID(IID_IShellWindows,
+            0x85CB6900, 0x4D95, 0x11CF,
+            0x96, 0x0C, 0x00, 0x80, 0xC7, 0xF4, 0xEE, 0x85);
+DEFINE_GUID(CLSID_ShellWindows,
+            0x9BA05972, 0xF6A8, 0x11CF,
+            0xA4, 0x42, 0x00, 0xA0, 0xC9, 0x0A, 0x8F, 0x39);
+
+
+__CRT_UUID_DECL(IShellDispatch2, 0xA4C6892C, 0x3BA9, 0x11d2,
+                0x9D, 0xEA, 0x00, 0xC0, 0x4F, 0xB1, 0x61, 0x62);
+__CRT_UUID_DECL(IShellFolderViewDual,  0xe7a1af80, 0x4d96,
+                0x11cf, 0x96, 0x0c, 0x00, 0x80, 0xc7, 0xf4, 0xee, 0x85);
+
+#ifndef SWC_DESKTOP /* Will probably be addedd in future mingw */
+#define SWC_DESKTOP 0x00000008
+/* from http://msdn.microsoft.com/en-us/library/windows/desktop/cc836581%28v=vs.85%29.aspx */
+#endif
+
+#undef INITGUID
+
+#ifdef DO_RELEASE_BUILD
+bool g_debug = false;
+#else
+bool g_debug = true;
+#endif
+
+typedef struct _stack_t
+{
+  struct _stack_t *next;
+  char text[1];          /* This should be the length of string_size. */
+} stack_t;
+
+static HINSTANCE g_hInstance; /* Our Instance. */
+
+#define UNUSED(x) (void)(x)
+
+/** @brief the actual execuation call on the shell dispatcher
+ *
+ * @param[in] disp The shell dispatcher to use for shell execute.
+ * @param[in] fName The file that should be exectued.
+ *
+ * @returns true on success.
+ */
+static bool
+shellexecute(IShellDispatch2 *disp, wchar_t *fName)
+{
+  BSTR bName = NULL,
+       bParam = NULL,
+       bDir = NULL,
+       bOp = NULL;
+  VARIANT vParams[4];
+  HRESULT hr;
+
+  if (!fName || !disp)
+    {
+      ERRORPRINTF ("Invalid call to shellexecute.");
+      return false;
+    }
+
+  bName = SysAllocString(fName);
+  bParam = SysAllocString(L"");
+  bDir = SysAllocString(L"");
+  bOp = SysAllocString(L"");
+
+  if (!bName || !bParam || !bDir || !bOp)
+    {
+      /* Out of memory */
+      ERRORPRINTF ("Failed to allocate bstr values ");
+      return false;
+    }
+
+  vParams[0].vt = VT_BSTR;
+  vParams[0].bstrVal = bParam;
+  vParams[1].vt = VT_BSTR;
+  vParams[1].bstrVal = bDir;
+  vParams[2].vt = VT_BSTR;
+  vParams[2].bstrVal = bOp;
+  vParams[3].vt = VT_INT;
+  vParams[3].intVal = SW_SHOWNORMAL;
+
+  hr = disp->ShellExecute(bName, vParams[0], vParams[1], vParams[2], vParams[3]);
+
+  SysFreeString(bName);
+  SysFreeString(bParam);
+  SysFreeString(bOp);
+  SysFreeString(bDir);
+
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to execute.");
+      return false;
+    }
+  return true;
+}
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Standard entry point for DLLs. */
+int WINAPI
+DllMain (HANDLE hinst, DWORD reason, LPVOID reserved)
+{
+  UNUSED(reserved);
+  if (reason == DLL_PROCESS_ATTACH)
+    g_hInstance = (HINSTANCE)hinst;
+  return TRUE;
+}
+
+/** @brief Execute a command with the current running shell.
+ *
+ * This function is intended to be called when you want to
+ * make sure that your application is not executed with higher
+ * privileges then the normal desktop session.
+ *
+ * The code is based on the idea:
+ * http://blogs.msdn.com/b/oldnewthing/archive/2013/11/18/10468726.aspx
+ *
+ * The function signature is explained by NSIS.
+ */
+void __declspec(dllexport) __cdecl Exec(HWND hwndParent,
+                                        int string_size,
+                                        char *variables,
+                                        stack_t **stacktop)
+{
+  UNUSED(hwndParent);
+  UNUSED(string_size);
+  HRESULT hr;
+  wchar_t *wbuf = NULL;
+  IShellWindows *shellWindows = NULL;
+  IShellBrowser *shellBrowser = NULL;
+  IShellView *shellView = NULL;
+  IShellFolderViewDual *folderView = NULL;
+  IShellDispatch2 *shellDispatch = NULL;
+  IServiceProvider *serviceProv = NULL;
+  HWND hwnd;
+  IDispatch *disp = NULL,
+             *bgDisp = NULL,
+              *sDisp = NULL;
+  VARIANT vEmpty = {};
+
+
+  if (!stacktop || !*stacktop || !(*stacktop)->text)
+    {
+      ERRORPRINTF ("Invalid call to exec :");
+      return;
+    }
+
+  /* Initialize com ctx */
+  hr = CoInitialize(NULL);
+  if(FAILED(hr))
+    {
+      ERRORPRINTF ("CoInitializeEx failed. error = 0x%lx.", hr);
+      return;
+    }
+
+  /* Get the shell interface */
+  hr = CoCreateInstance(CLSID_ShellWindows,
+                        NULL, CLSCTX_LOCAL_SERVER,
+                        IID_PPV_ARGS(&shellWindows));
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to get shell interface.");
+      goto done;
+    }
+
+  /* Get the desktop shell window */
+  hr = shellWindows->FindWindowSW(&vEmpty,
+                                  &vEmpty,
+                                  SWC_DESKTOP,
+                                  (long*)&hwnd,
+                                  SWFO_NEEDDISPATCH,
+                                  &disp);
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to find the desktop dispatcher.");
+      goto done;
+    }
+
+  hr = disp->QueryInterface(IID_PPV_ARGS(&serviceProv));
+
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to get the service provider.");
+      goto done;
+    }
+
+  /* Get the shell browser */
+  hr = serviceProv->QueryService(SID_STopLevelBrowser, IID_PPV_ARGS(&shellBrowser));
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to find the top level browser.");
+      goto done;
+    }
+
+  hr = shellBrowser->QueryActiveShellView(&shellView);
+
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to find the active view.");
+      goto done;
+    }
+
+  hr = shellView->GetItemObject(SVGIO_BACKGROUND, IID_PPV_ARGS(&bgDisp));
+
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to get the views background.");
+      goto done;
+    }
+
+  hr = bgDisp->QueryInterface(IID_PPV_ARGS(&folderView));
+
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to get the folder view.");
+      goto done;
+    }
+
+
+  hr = folderView->get_Application(&sDisp);
+
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to get the shell dispatch.");
+      goto done;
+    }
+
+  hr = sDisp->QueryInterface(IID_PPV_ARGS(&shellDispatch));
+
+  if (FAILED(hr))
+    {
+      ERRORPRINTF ("Failed to get the shell dispatch interface.");
+      goto done;
+    }
+
+  wbuf = utf8_to_wchar((*stacktop)->text, strlen((*stacktop)->text));
+  if (!wbuf)
+    {
+      ERRORPRINTF ("Failed to convert argument to wchar. error = 0x%lx.", hr);
+      goto done;
+    }
+
+  if (!shellexecute(shellDispatch, wbuf))
+    {
+      ERRORPRINTF ("Failed to execute.");
+    }
+  xfree (wbuf);
+done:
+  if (folderView)
+    {
+      folderView->Release();
+    }
+  if (disp)
+    {
+      disp->Release();
+    }
+  if (shellBrowser)
+    {
+      shellBrowser->Release();
+    }
+  if (shellWindows)
+    {
+      shellWindows->Release();
+    }
+  if (shellView)
+    {
+      shellView->Release();
+    }
+  if (sDisp)
+    {
+      sDisp->Release();
+    }
+  if (shellDispatch)
+    {
+      shellDispatch->Release();
+    }
+  if (serviceProv)
+    {
+      serviceProv->Release();
+    }
+  CoUninitialize();
+  return;
+}
+#ifdef __cplusplus
+}
+#endif
+
+