The Tor Browser: other-licenses/nsis/Contrib/ServicesHelper/Services.cpp@97036ab72558 (annotated)

other-licenses/nsis/Contrib/ServicesHelper/Services.cpp@97036ab72558 (annotated)

other-licenses/nsis/Contrib/ServicesHelper/Services.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <windows.h>
 #include "../../../../toolkit/mozapps/update/common/pathhash.h"
 #pragma comment(lib, "advapi32.lib")
 typedef struct _stack_t {
   struct _stack_t *next;
   TCHAR text[MAX_PATH];
 } stack_t;
 int popstring(stack_t **stacktop, LPTSTR str, int len);
 void pushstring(stack_t **stacktop, LPCTSTR str, int len);
 /**
  * Determines if the specified service exists or not
  *
  * @param  serviceName The name of the service to check
  * @param  exists      Whether or not the service exists
  * @return TRUE if there were no errors
  */
 static BOOL
 IsServiceInstalled(LPCWSTR serviceName, BOOL &exists)
 {
   exists = FALSE;
   // Get a handle to the local computer SCM database with full access rights.
   SC_HANDLE serviceManager = OpenSCManager(NULL, NULL,
                                            SC_MANAGER_ENUMERATE_SERVICE);
   if (!serviceManager) {
     return FALSE;
   }
   SC_HANDLE serviceHandle = OpenServiceW(serviceManager,
                                          serviceName,
                                          SERVICE_QUERY_CONFIG);
   if (!serviceHandle && GetLastError() != ERROR_SERVICE_DOES_NOT_EXIST) {
     CloseServiceHandle(serviceManager);
     return FALSE;
   }
   if (serviceHandle) {
     CloseServiceHandle(serviceHandle);
     exists = TRUE;
   }
   CloseServiceHandle(serviceManager);
   return TRUE;
 }
 /**
  * Determines if the specified service is installed or not
  *
  * @param  stacktop  A pointer to the top of the stack
  * @param  variables A pointer to the NSIS variables
  * @return 0 if the service does not exist
  *         1 if the service does exist
  *         -1 if there was an error.
  */
 extern "C" void __declspec(dllexport)
 IsInstalled(HWND hwndParent, int string_size,
             TCHAR *variables, stack_t **stacktop, void *extra)
 {
   TCHAR tmp[MAX_PATH] = { L'\0' };
   WCHAR serviceName[MAX_PATH] = { '\0' };
   popstring(stacktop, tmp, MAX_PATH);
 #if !defined(UNICODE)
     MultiByteToWideChar(CP_ACP, 0, tmp, -1, serviceName, MAX_PATH);
 #else
     wcscpy(serviceName, tmp);
 #endif
   BOOL serviceInstalled;
   if (!IsServiceInstalled(serviceName, serviceInstalled)) {
     pushstring(stacktop, TEXT("-1"), 3);
   } else {
     pushstring(stacktop, serviceInstalled ? TEXT("1") : TEXT("0"), 2);
   }
 }
 /**
  * Stops the specified service.
  *
  * @param  serviceName The name of the service to stop
  * @return TRUE if the operation was successful
  */
 static BOOL
 StopService(LPCWSTR serviceName)
 {
   // Get a handle to the local computer SCM database with full access rights.
   SC_HANDLE serviceManager = OpenSCManager(NULL, NULL,
                                            SC_MANAGER_ENUMERATE_SERVICE);
   if (!serviceManager) {
     return FALSE;
   }
   SC_HANDLE serviceHandle = OpenServiceW(serviceManager,
                                          serviceName,
                                          SERVICE_STOP);
   if (!serviceHandle) {
     CloseServiceHandle(serviceManager);
     return FALSE;
   }
   //Stop the service so it deletes faster and so the uninstaller
   // can actually delete its EXE.
   DWORD totalWaitTime = 0;
   SERVICE_STATUS status;
   static const int maxWaitTime = 1000 * 60; // Never wait more than a minute
   BOOL stopped = FALSE;
   if (ControlService(serviceHandle, SERVICE_CONTROL_STOP, &status)) {
     do {
       Sleep(status.dwWaitHint);
       // + 10 milliseconds to make sure we always approach maxWaitTime
       totalWaitTime += (status.dwWaitHint + 10);
       if (status.dwCurrentState == SERVICE_STOPPED) {
         stopped = true;
         break;
       } else if (totalWaitTime > maxWaitTime) {
         break;
       }
     } while (QueryServiceStatus(serviceHandle, &status));
   }
   CloseServiceHandle(serviceHandle);
   CloseServiceHandle(serviceManager);
   return stopped;
 }
 /**
  * Stops the specified service
  *
  * @param  stacktop  A pointer to the top of the stack
  * @param  variables A pointer to the NSIS variables
  * @return 1 if the service was stopped, 0 on error
  */
 extern "C" void __declspec(dllexport)
 Stop(HWND hwndParent, int string_size,
      TCHAR *variables, stack_t **stacktop, void *extra)
 {
   TCHAR tmp[MAX_PATH] = { L'\0' };
   WCHAR serviceName[MAX_PATH] = { '\0' };
   popstring(stacktop, tmp, MAX_PATH);
 #if !defined(UNICODE)
     MultiByteToWideChar(CP_ACP, 0, tmp, -1, serviceName, MAX_PATH);
 #else
     wcscpy(serviceName, tmp);
 #endif
   if (StopService(serviceName)) {
     pushstring(stacktop, TEXT("1"), 2);
   } else {
     pushstring(stacktop, TEXT("0"), 2);
   }
 }
 /**
  * Determines a unique registry path from a file or directory path
  *
  * @param  stacktop  A pointer to the top of the stack
  * @param  variables A pointer to the NSIS variables
  * @return The unique registry path or an empty string on error
  */
 extern "C" void __declspec(dllexport)
 PathToUniqueRegistryPath(HWND hwndParent, int string_size,
                          TCHAR *variables, stack_t **stacktop,
                          void *extra)
 {
   TCHAR tmp[MAX_PATH] = { L'\0' };
   WCHAR installBasePath[MAX_PATH] = { '\0' };
   popstring(stacktop, tmp, MAX_PATH);
 #if !defined(UNICODE)
     MultiByteToWideChar(CP_ACP, 0, tmp, -1, installBasePath, MAX_PATH);
 #else
     wcscpy(installBasePath, tmp);
 #endif
   WCHAR registryPath[MAX_PATH + 1] = { '\0' };
   if (CalculateRegistryPathFromFilePath(installBasePath, registryPath)) {
     pushstring(stacktop, registryPath, wcslen(registryPath) + 1);
   } else {
     pushstring(stacktop, TEXT(""), 1);
   }
 }
 BOOL WINAPI
 DllMain(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved)
 {
   return TRUE;
 }
 /**
  * Removes an element from the top of the NSIS stack
  *
  * @param  stacktop A pointer to the top of the stack
  * @param  str      The string to pop to
  * @param  len      The max length
  * @return 0 on success
 */
 int popstring(stack_t **stacktop, TCHAR *str, int len)
 {
   // Removes the element from the top of the stack and puts it in the buffer
   stack_t *th;
   if (!stacktop || !*stacktop) {
     return 1;
   }
   th = (*stacktop);
   lstrcpyn(str,th->text, len);
   *stacktop = th->next;
   GlobalFree((HGLOBAL)th);
   return 0;
 }
 /**
  * Adds an element to the top of the NSIS stack
  *
  * @param  stacktop A pointer to the top of the stack
  * @param  str      The string to push on the stack
  * @param  len      The length of the string to push on the stack
  * @return 0 on success
 */
 void pushstring(stack_t **stacktop, const TCHAR *str, int len)
 {
   stack_t *th;
   if (!stacktop) {
     return;
   }
   th = (stack_t*)GlobalAlloc(GPTR, sizeof(stack_t) + len);
   lstrcpyn(th->text, str, len);
   th->next = *stacktop;
   *stacktop = th;
 }

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other-licenses/nsis/Contrib/ServicesHelper/Services.cpp@97036ab72558 (annotated)

other-licenses/nsis/Contrib/ServicesHelper/Services.cpp