[Openmcl-devel] Who uses CL+SSL and CCL?

John McAleely john at mcaleely.com
Fri Jan 16 11:29:28 UTC 2009


On 16 Jan 2009, at 01:59, Gary Byers wrote:

> I was able to reproduce the problem.  I know next to nothing about
> using SSL; so so far I only have a very general idea of what's
> going on.

It's good to know I'm not going mad.


> TEST-HTTPS-SERVER does:
>
>      (let* ((socket (trivial-sockets:accept-connection
> 		      server
> 		      :element-type '(unsigned-byte 8)))
> 	     (client (cl+ssl:make-ssl-server-stream
> 		      (cl+ssl:stream-fd socket)
> 		      :external-format :iso-8859-1
> 		      :certificate cert
> 		      :key key)))
>
> So, without looking at that too closely, it -looks- like SOCKET and
> CLIENT share the same file descriptor.
>
> Then:
>
> 	  (close socket)  ; possibly closing the shared fd
> 	  (close client)  ; possibly forcing output to the closed fd
>
>          )))))
>
> If that's what's going on, it can't work (or at least can't work
> in general.)  If I add
>
>          (force-output client)
>
> just before those two CLOSE calls, I get output in the web browser and
> in the listener that's running the server example, and the server
> waits for the next connection.

I can reproduce this result. I think my own naive understanding of  
what is going on would call the order of calls to close a bug. The  
cautious part of me would want to close the client before the socket,  
since they appear to have some sort of dependency.

I could well imagine other implementations where this hasn't been  
exposed as a problem. Is it possible that a recent change in CCL has  
surfaced this bug in the CL+SSL test code?

I'm happy that making this change is an appropriate way to fix this  
problem.

> Lastly, I tried this in the CCL trunk (and got the same error that you
> did.)  I don't think that anything that's changed since 1.2-RC1
> would affect this, but there were bug fixes between 1.2-RC1 and
> the final version of 1.2, and there are post-1.2 fixes in the 1.2
> tree, so you might avoid other problems by upgrading.

It's on my todo list, but CCL is also on my 'if it ain't broke...' list.

Thank you,

J




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