Contains:
- Delegation Configurator that can lookup/edit/save configuration information to registry
- Conhost can lookup the CLSID of a registered default
- Conhost has the ability to handoff a starting visible-window interactive session to the registered default
- Velocity key since this is a big deal and we want to be careful
- IDL for the interface
Related work items: MSFT-16458099
Retrieved from https://microsoft.visualstudio.com os.2020 OS official/rs_wdx_dxp_windev 0ca55027d8180fbbaa145f2fe7a15005856c0f7c
This commit replaces DeviceComm with the interface IDeviceComm and the
concrete implementation type ConDrvDeviceComm. This work is done in
preparation for different device backends.
In addition to separating out ConDrv-specific behavior, I've introduced
a "handle exchange" interface.
HANDLE EXCHANGE
---------------
There are points where we give ConDrv opaque handle identifiers to our
input buffer, output buffer and process data. The exact content of the
opaque identifier is meaningless to ConDrv: the driver's only
interaction with these identifiers is to hold onto them and send back
whichever are pertinent for each API call.
Because of that, we used the raw register-width pointer value of the
input buffer, output buffer or process data _as_ the opaque handle
value.
This works very well for ConDrv <-> conhost using the ConDrvDeviceComm.
It works less well for something like the "logging" DeviceComm that will
log packets to a file: those packets *cannot* contain pointer values (!)
To address this, and to afford flexibility to DeviceComm implementers,
I've introduced a two-member complement of handle management functions:
* `ULONG_PTR PutHandle(void*)` registers an object with the DeviceComm
and returns an opaque identifier.
* `void* GetHandle(ULONG_PTR)` takes an opaque identifier and returns
the original object.
ConDrvDeviceComm implements PutHandle and GetHandle by casting the
object pointer to the "opaque handle value", which maintains wire format
compatibility[1] with revisions of conhost prior to this change.
Simpler DeviceComm implementations that require handle tracking but
cannot bear raw pointers can implement these functions by returning an
autoincrementing ID (or similar) and registering the raw object pointer
in a mapping.
I've audited all existing handle exchanges with the driver and updated
them to use Put/GetHandle.
(I intended to add DestroyHandle, but we are not equipped for handle
removal at the moment. ConsoleHandleData/ConsoleProcessHandle are
destroyed during wait routine completion, on client disconnect, etc.
This does mean that an id<->pointer mapping will grow without bound, but
at a cost of ~8 bytes per entry and a short-lived console session I am
not too concerned about the cost.)
[1] Wire format compatibility is not required, and later we may want to
switch ConDrvDeviceComm to `EncodePointer` and `DecodePointer` just to
insulate us against a spurious ConDrv packet allowing for an arbitrary
4/8-byte read and subsequent liftoff into space.
