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Prevent openssh from sending "--" to the server with scp?
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matt.pouns...@gmail.com  
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 More options Aug 29 2012, 3:55 pm
Newsgroups: comp.security.ssh
From: matt.pouns...@gmail.com
Date: Wed, 29 Aug 2012 12:55:16 -0700 (PDT)
Local: Wed, Aug 29 2012 3:55 pm
Subject: Prevent openssh from sending "--" to the server with scp?
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Apologies if this is handled somewhere, "--" is unbelievably hard to google for in context.

I'm having a problem with an embedded system which doesn't like the '--' that the scp client in openssh sends to end argument processing.

debug1: Sending command: scp -v -f -- /foo.txt
Received disconnect from 10.1.1.1: 2: Protocol error.

I'm working with the vendor to see if we can get the server fixed, but in the mean time I'm looking for a workaround.  Does anyone know of a way to convince the openssh to not send the --?  I know it can work since older versions didn't send it... we ran into this problem while migrating some scriptery to a newer box.

Thanks for any suggestions!
   Matt


 
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Richard E. Silverman  
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 More options Aug 29 2012, 6:59 pm
Newsgroups: comp.security.ssh
From: Richard E. Silverman <r...@qoxp.net>
Date: Wed, 29 Aug 2012 18:59:35 -0400
Local: Wed, Aug 29 2012 6:59 pm
Subject: Re: Prevent openssh from sending "--" to the server with scp?
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matt.pouns...@gmail.com writes:
> Apologies if this is handled somewhere, "--" is unbelievably hard to google for in context.

> I'm having a problem with an embedded system which doesn't like the '--' that the scp client in openssh sends to end argument processing.

> debug1: Sending command: scp -v -f -- /foo.txt
> Received disconnect from 10.1.1.1: 2: Protocol error.

This was fixed in OpenSSH 6.0, which now adds the "--" only if needed
because of a leading "-" in the next token on the command line:

[scp.c]
-                       xasprintf(&bp, "%s -f -- %s", cmd, src);
+                       xasprintf(&bp, "%s -f %s%s", cmd,
+                           *src == '-' ? "-- " : "", src);

So, you could avoid this by upgrading the client.

- Richard


 
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matt.pouns...@gmail.com  
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 More options Aug 29 2012, 10:33 pm
Newsgroups: comp.security.ssh
From: matt.pouns...@gmail.com
Date: Wed, 29 Aug 2012 19:33:10 -0700 (PDT)
Local: Wed, Aug 29 2012 10:33 pm
Subject: Re: Prevent openssh from sending "--" to the server with scp?
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On Wednesday, 29 August 2012 18:59:37 UTC-4, Richard E. Silverman  wrote:

> So, you could avoid this by upgrading the client.

Ah excellent. Thanks!

 
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