Re: [FreeRDP-devel] Proxying Enhanced RemoteApp sessions

[Armin N. <arm...@th...>]

Hi,


FreeRDP does support the capabilities and messages but the rendering 
code of xfreerdp does not.

To enable it in FreeRDP you need to change

settings->HiDefRemoteApp = FALSE; to TRUE in settings.c

This will enable sending INFO_HIDEF_RAIL_SUPPORTED flag in 
rdp_write_info_packet


but be warned, the rendering will not work as it requires some changes 
to xfreerdp code.


regards

Armin

On 22.01.21 19:38, Richard Dymond via FreeRDP-devel wrote:
> Hi
>
> I'm using the FreeRDP library (version 2.2.0) to proxy RDP sessions between
> an RDP client (mstsc) and a Windows 2012 RDS server. I'm trying to get
> Enhanced RemoteApp sessions (where just the remote application window is
> rendered, and the remote desktop background is not) to work, but have had
> no success yet.
>
> As far as I can tell, the appropriate message sequences between mstsc and
> the proxy, and between the proxy and the RDS server, are taking place:
>
> - mstsc sends a Client Info PDU with the INFO_RAIL and
> INFO_HIDEF_RAIL_SUPPORTED flags set to the proxy
> - the proxy responds with a Remote Programs Capability Set that has the
> TS_RAIL_LEVEL_SUPPORTED and TS_RAIL_LEVEL_HANDSHAKE_EX_SUPPORTED flags set
> - mstsc responds with a Remote Programs Capability Set that has the
> TS_RAIL_LEVEL_SUPPORTED and TS_RAIL_LEVEL_HANDSHAKE_EX_SUPPORTED flags set
>
> At this point, mstsc is apparently ready for an Enhanced RemoteApp session.
> Then the proxy connects to the RDS server and:
>
> - the proxy sends a Client Info PDU with the INFO_RAIL and
> INFO_HIDEF_RAIL_SUPPORTED flags set to the RDS server
> - the RDS server responds with a Remote Programs Capability Set that has
> the TS_RAIL_LEVEL_SUPPORTED and TS_RAIL_LEVEL_HANDSHAKE_EX_SUPPORTED flags
> set
> - the proxy responds with a Remote Programs Capability Set that has the
> TS_RAIL_LEVEL_SUPPORTED and TS_RAIL_LEVEL_HANDSHAKE_EX_SUPPORTED flags set
>
> After this, I'd expect the RDS server to send a TS_RAIL_ORDER_HANDSHAKE_EX
> message over the RAIL virtual channel to initiate the Enhanced RemoteApp
> session. But instead it sends a plain TS_RAIL_ORDER_HANDSHAKE message, and
> the RemoteApp session starts, but not in Enhanced mode.
>
> Any idea what could be going wrong? Does FreeRDP even support Enhanced
> RemoteApp sessions (what I've seen of the code suggests that it does, but
> perhaps I'm misreading it).
>
> Thanks.
>
> Richard
>
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