Source code of Windows XP (NT5)
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Program Interface for C2Config Dll's
Written: 7-Feb-95 Revisions: none
Overview
The C2Config utility provides an extensible interface for adding additional security functions to be displayed and controlled from the C2Config list. These functions are provided in the form of a dynamic-link library (DLL) that is referenced in the C2CONFIG.INF file. This file describes the interface requirements for these additional functions.
A C2Config DLL must include the C2DLL.H file for the structure definitions used between the main application program and the DLL. The DLL must also supply the following exported entry points for use by the application (the actual function names may be defined by the DLL developer). The following function names will be used in this description when referencing the DLL functions.
GetStatusFunction UserInterfaceFunction SetStatusFunction
The actual function names defined in the DLL must be listed in the C2CONFIG.INF file for them to be recognized by the application.
GetStatusFunction
When the application is first started and whenever the Refresh display menu item is selected, the GetStatusFunction for each item is called to determine the current status of that item. The application calls the function, passing the pointer to a C2DLL_DATA data structure initialized as follows:
lActionCode = 0 lActionValue = 0 hWnd = window handle to main app window lC2Compliance = C2DLL_NOT_SECURE; szItemName = ItemName as read from C2CONFIG.INF file szStatusName = Empty String (all null chars) on first call, previous status on all subsequent calls
The GetStatusFunction then determines the current state of the item it is responsible for and fills in the following fields of the C2DLL_DATA structure whose pointer was passed in the argument list:
lActionCode = (not used) lActionValue = (not used) hWnd = (not changed) lC2Compliance = Current compliance value szItemName = (not changed) szStatusName = string describing current status of this item After detecting the current status of the security item and filling in the C2DLL_DATA structure, the function returns the WIN32 error status value describing the success or failure of the function call. The data returned will be assumed valid only if the return status is ERROR_SUCCESS; UserInterfaceFunction
The User Interface Function is called when the user double-clicks or otherwise selects a security item from the list displayed in the main application window. The purpose of this function is to allow the user to change the current state of the selected item.
When the item is selected, the function is called, passing a pointer to the C2DLL_DATA structure as the only argument. The fields in the structure are initialized as follows:
lActionCode = 0 lActionValue = 0 hWnd = the window handle of the main app window lC2Compliance = the current compliance value as returned by the last GetStatusFunction call szItemName = the name string for this item as read from the C2CONFIG.INF file szStatusName = the string describing the current status of this item as returned by the last call to the GetStatusFunction
The Display function will present the necessary user interface to the user for their input and then fill the following fields of the C2DLL_DATA block referenced by the pointer passed in the argument list:
lActionCode = code describing action to take in order to perform task selected by user. 0 == no change or no action lActionValue = value to be used, if necessary, if the lActionCode is not 0 hWnd = (not changed) lC2Compliance = (not changed) szItemName = (not changed) szStatusName = (not changed)
The UserInterfaceFunction returns a Win32 error status value as the return value of the function to indicate if the function was successful or not. If the return code is not ERROR_SUCCESS, then the returned data is ignored.
SetStatusFunction
If the lActionCode field in the data structure returned by the UserInterfaceFunction is not 0, then the SetStatusFunction is called. The C2DLL_DATA structure passed to the SetStatusFunction is unchanged from the data returned by the UserInterfaceFunction.
The SetStatusFunction performs the action defined in the lActionCode field of the structure, using the lActionValue field as necessary. If the status of the item is changed, then this routine must update the following fields in the data structure.
lActionCode = set to 0 lActionValue = set to 0 hWnd = (not changed) lC2Compliance = set to the current state (as a result of the change) szItemName = (not changed) szStatusName = set to the current state (as a result of the change)
The SetStatusFunction returns a Win32 error status code to indicate the success or failure of the function, and the list entry in the main application window is updated to show the current status of this item.
C2CONFIG.INF
Each entry in the main application window is described in the C2CONFIG.INF file. The file consists of a single section under the [C2 Security Items] section heading. Under that section, each entry consists of the following elements:
Item Name = this is the string to be displayed in the application window under the "Security Feature" heading. Make sure the text is not so long as to be truncated in the display.
DLL = the filename of the DLL that contains the functions that follow in the entry. The DLL must be located in one of the following directories in order to be recognized by the application:
The current directory The WINDOWS (%systemroot%) directory The SYSTEM (%systemroot%\SYSTEM32) directory The directory containing C2CONFIG.EXE a directory in the "Path"
QueryFn = the exported function name found in the DLL file mentioned above that performs the GetStatusFunction service described above.
SetFn = the exported function name found in the DLL file mentioned above that performs the SetStatusFunction service described above.
UserInterfaceFn = the exported function name found in the DLL file mentioned above that performs the UserInterfaceFunction service described above.
RebootIfChanged = "1" if changing this feature requires the system to be restarted in order for the change to take effect. Otherwise, this value should be a "0".
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