Warn if interative service is not installed or not running

Signed-off-by: Selva Nair <selva.nair@gmail.com>

main.c

@@ -178,6 +178,9 @@ int WINAPI _tWinMain (HINSTANCE hThisInstance,
     exit(1);
   }
 
+  if (!IsUserAdmin())
+    CheckIServiceStatus();
+
   BuildFileList();
   if (!VerifyAutoConnections()) {
     exit(1);

openvpn-gui-res.h

@@ -229,6 +229,8 @@
 #define IDS_NFO_RESTARTED               1708
 #define IDS_ERR_ACCESS_SERVICE_PIPE     1709
 #define IDS_ERR_WRITE_SERVICE_PIPE      1710
+#define IDS_ERR_NOTSTARTED_ISERVICE     1711
+#define IDS_ERR_INSTALL_ISERVICE        1712
 
 /* Registry Related */
 #define IDS_ERR_GET_WINDOWS_DIR         1801

res/openvpn-gui-res-en.rc

@@ -327,6 +327,10 @@ BEGIN
     IDS_NFO_RESTARTED "OpenVPN Service Restarted."
     IDS_ERR_ACCESS_SERVICE_PIPE "Access to service pipe failed."
     IDS_ERR_WRITE_SERVICE_PIPE "Writing to service pipe failed."
+    IDS_ERR_INSTALL_ISERVICE     """OpenVPNServiceInteractive"" is not installed.\n"
+                                 "Tasks requiring administrative access may not work."
+    IDS_ERR_NOTSTARTED_ISERVICE  """OpenVPNServiceInteractive"" is not started.\n"
+                                 "Tasks requiring administrative access may not work."
 
     /* registry */
     IDS_ERR_GET_WINDOWS_DIR "Error getting Windows Directory."

service.c

@@ -241,6 +241,40 @@ int MyReStartService()
     return(false);
 }
 
+bool
+CheckIServiceStatus()
+{
+    SC_HANDLE schSCManager;
+    SC_HANDLE schService;
+    SERVICE_STATUS ssStatus;
+
+    // Open a handle to the SC Manager database.
+    schSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT);
+
+    if (NULL == schSCManager)
+        return(false);
+
+    schService = OpenService(schSCManager, _T("OpenVPNServiceInteractive"),
+                             SERVICE_QUERY_STATUS);
+    if (schService == NULL &&
+        GetLastError() == ERROR_SERVICE_DOES_NOT_EXIST)
+    {
+        /* warn that iservice is not installed */
+        ShowLocalizedMsg(IDS_ERR_INSTALL_ISERVICE);
+        return(false);
+    }
+
+    if (!QueryServiceStatus(schService, &ssStatus))
+        return(false);
+
+    if (ssStatus.dwCurrentState != SERVICE_RUNNING)
+    {
+        /* warn that iservice is not started */
+        ShowLocalizedMsg(IDS_ERR_NOTSTARTED_ISERVICE);
+        return(false);
+    }
+    return true;
+}
 
 int CheckServiceStatus()
 {