Re: [Xpert]LocalClient extensions vs. ssh
Joe Krahn writes: Aside from LocalClient returning false, DGA requests should fail, right? LocalClient() returns TRUE therefore DGA doesn't fail. Trying GL over the tunnel correctly gives an error message and reverts to indirect rendering. That's different. With direct rendering the client library connects directly to the hw. It does not rely on the sever to fail. I don't know much about DGA, but my understanding is that it has a lot of issues because it is sort of a big hack (but useful), and the real solution is to replace it with real protocols like XVideo and a similar capture extension. This is not limited to DGA. Other extensions that depend on being run locally have the same problem if they rely on the sever's LocalClient() implementation. Egbert. ___ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
Re: [Xpert]LocalClient extensions vs. ssh
Egbert Eich wrote: Joe Krahn writes: Aside from LocalClient returning false, DGA requests should fail, right? LocalClient() returns TRUE therefore DGA doesn't fail. Oh... I understand now. I didn;t know about the LocalClient fucntion, but it's whole purpose is to supply info so that, for example, DGA can do the right thing. Clearly, LocalClient needs a foolproof way to determine if a client really is local. Not understanding how DGA memory access works, here's a question: If the tunneled server gives permission for direct memory access, how does the local user get access to write into system memory without simply getting a segfault? Also, what happens when a client is accessing server memory, and you switch to a different virtual terminal? Thanks, Joe Krahn ___ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
[Xpert]LocalClient extensions vs. ssh
When running X request thru a ssh tunnel LocalClient() returns true as the sshd connects to the Xserver from the same machine. This leads to unpredictable results and even system crashes if an application that can only run locally is started on a remote system. If for example an application wants to address the framebuffer directly thru DGA it will try to map the framebuffer on the machine it is started on not the one where the Xserver lives on. Even though this requires root privileges I do consider this to be a problem that should be adressed. Any ideas? Egbert. ___ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
Re: [Xpert]LocalClient extensions vs. ssh
Egbert Eich wrote: When running X request thru a ssh tunnel LocalClient() returns true as the sshd connects to the Xserver from the same machine. This leads to unpredictable results and even system crashes if an application that can only run locally is started on a remote system. If for example an application wants to address the framebuffer directly thru DGA it will try to map the framebuffer on the machine it is started on not the one where the Xserver lives on. Even though this requires root privileges I do consider this to be a problem that should be adressed. Any ideas? Aside from LocalClient returning false, DGA requests should fail, right? Trying GL over the tunnel correctly gives an error message and reverts to indirect rendering. I don't know much about DGA, but my understanding is that it has a lot of issues because it is sort of a big hack (but useful), and the real solution is to replace it with real protocols like XVideo and a similar capture extension. Joe Krahn ___ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
