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70 lines
5.2 KiB
Text
70 lines
5.2 KiB
Text
=== Introduction ===
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The netshell library is responsible for managing network connections. The user interface is accessed
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by opening the control panel and selecting the "Network Connections" folder.
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The netshell library provides COM interfaces to enumerate available network adapters, network protocols, network clients and network transports
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and receive detailed information about them. However, it cannot configure these components. For configuration, look in the netcfgx documentation
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(Hint: INetCfg)
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=== Interface ===
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The user interface is exposed by implementing the IShellFolder interface as required by explorer
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namespace extension. The code is currently placed in shfldr_netconnect.c
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The enumeration of the available network connections is performed by the IShellFolder::EnumObjects
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(ISF_NetConnect_fnEnumObjects). It uses the INetConnectionManager interface implemented by netshell
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in connectmanager.c to enumerate all available network connections.
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The context menu of network connection items is populated by the IContextMenu::QueryContextMenu
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(ISF_NetConnect_IContextMenu3_QueryContextMenu) which is obtained by IShellFolder::GetUIObjectOf. The actions are performed by the
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IContextMenu::InvokeCommand function (ISF_NetConnect_IContextMenu3_InvokeCommand). At the moment
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the actions "Status" / "Properties" are implemented.
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=== Status Dialog & Notification Area ===
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The status dialog is implemented by IOleCommandTarget interface(CLSID_ConnectionTray). This interface manages all status dialogs
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for all available dialogs. The interface is implemented as a singleton to avoid multiple notification icons
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appearing in the Notification area of the explorer. Every time the IShellFolder object is created (ISF_NetConnect_Constructor),
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it creates a reference to IOleCommandTarget interface and calls its IOleCommandTarget::Exec function with CGID_ShellServiceObject.
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This causes IOleCommandTarget interface to enumerate all available network connections, check if they should be shown (NCCF_SHOW_ICON flag set
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in the NETCON_PROPERTIES dwCharacter), and add them to notification area with Shell_NotifyIcon. For that purpose a hidden window is created (dialog
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procedure is LANStatusDlg) which receives WM_SHOWSTATUSDLG msg when it shall show display the status dialog.
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When a user wants to display the status dialog by clicking on the context menu of network connection item, the IShellFolder sends the NetCfgInstanceId of
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the selected network connection to IOleCommandTarget::Exec function. The function then looks up the specified notification item and then sends
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the WM_SHOWSTATUSDLG msg to specific window.
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=== Network Connections Property Dialog ===
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The network connections property dialog is implemented by the INetConnectionPropertyUi2 interface. The class id is obtained by calling
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INetConnection::GetUiObjectClassId of the current selected network connection. After obtaining the interface by calling CoCreateInstance, the
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selected network connection is stored as reference by calling INetConnectionPropertyUi::SetConnection. The next step is to call
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INetConnectionPropertyUi::AddPages to add custom property pages to the property sheet set. If the function succeeds, the caller can then invoke
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PropertySheetW function to display the properties.
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Note: If the context doesn't match, i.e. the INetConnectionPropertyUi2 cannot work together
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with current INetConnection, then it should fail INetConnectionPropertyUi::AddPages
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Note: The function ShowNetConnectionProperties in shlfdr_netconnect.c shows how to invoke the Network Connections Property Dialog
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The enumeration of network components (protocols, client, transport) is done by using the INetCfg api). Initialization is performed in InitializeLANPropertiesUIDlg
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function. When a user accepts changes, it calls INetCfg::Apply or when it aborts the changes INetCfg::Cancel.
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=== Known Issues ===
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* Status changes of an adapter are not automatically updated because the information is cached
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* There seems to be an icon problem which makes icon blink in the status dialog
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=== Testing in windows ===
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Unfortunately in windows the CLSID_ConnectionManager class is implemented in the netman
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service and netshell contains the rpc proxy stubs for it. This means that until we are able to
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reimplement these stubs alongside all its unimplemented interfaces and objects, we can't replace
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the system netshell with ours (INetConnectionManager and IEnumNetConnection are only the tip
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of the iceberg).
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However it is perfectly fine if one copies our netshell in a different folder and change the
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registry settings to make it handle CLSID_ConnectionFolder, CLSID_LanConnectionUi and CLSID_ConnectionTray.
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When doing so there are actually two options about how to test. One is leaving #define USE_CUSTOM_CONMGR 1
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as is and the other is setting is to 0. What this does is that when 0, the connections will be enumerated
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in the shell folder and the tray using the system's INetConnectionManager (which resides in the system's
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netman service and is accessible through the system's netshell.dll). This allows us to implement and
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test our three components against the correct implementation of INetConnectionManager.
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The other option is setting USE_CUSTOM_CONMGR to 1 which will make the shell folder and the tray
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enumerate connections with our connection manager effectively testing it in windows as well.
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