Re: ssh_handle_packets blocking issue

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

Hello Jeetu, Sharon,

I'll look at that issue asap. It's a blocking problem for release 0.5.

Aris

Le 2/04/11 21:48, jeetu.golani@xxxxxxxxx a écrit :
> Hi,
> 
> As I've mentioned here before I've been trying to put together a SSH
> server with libssh that does pubkey authentication and X11 forwarding.
> Milo has been helping me with this a lot :) I've been using the libssh
> off Milo's tree wherein he's implemented server side X11 handling.
> 
> I've been trying to debug a situation wherein the X11 forwarding works
> on occassion but otherwise mysteriously fails. Approximately the
> failure rate would be around 20% and the ssh client shows that the X11
> channel is being created. I realized that when it fails the block
> occurs after ssh_channel_open_x11 within channel_open and in the call
> ssh_handle_packets(session,-1).
> 
> Apparently the -1 causes this to block till there is an event. I tried
> replacing the -1 with a random number such as 2000 (milliseconds) and
> things work much better now....there still is a failure rate with my
> X11 forwarding of about 2-5% (from 20%) but there seems to be an
> effect.
> 
> Of course this was just a random trying to debug approach and I don't
> know enough of libssh to know whether the infinite timeout is required
> or what the real reason for this behaviour is, truthfully I'm not even
> sure if there's something I'm doing in my code that is manifesting in
> this error here - don't know what that could be though - only suspect
> I have is that in the call to ssh_channel_open_x11 for ip I am
> mentioning the ssh server ip and for port the port on which ssh port
> listens in for connections (not sure if this is what's supposed to go
> in here but seems that these are for logging anyway, but what is truly
> expected in these values and if they have an impact is a question I
> don't fully understand so thought I'd mention it here in case there's
> a link).
> 
> I'd truly appreciate your help here since I don't understand the inner
> workings of libssh to be able to take it much further on my own - the
> random 2 second interval while it works in this case may not be apt in
> other situations for e.g. Also it still does fail on occassion even
> now.
> 
> All the help is truly appreciated. If someone here is interested I
> could send across my server code so that maybe people can point out
> the bugs :)
> 
> Bye for now
> 
> ebrain.in
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