ssh-sftp-perl-users

[Ssh-sftp-perl-users] Net::SSH::Perl is hanging on long command lines

[James P. <jam...@op...>]

I have a script that connects to a server and checks if a list of rpms
are installed. On some servers this hangs, on others it works fine.

The problem seems to occur when the command being executed is longer
than about 22000 characters.

I've uploaded a simplified version of the script - that only does an
echo - to pastebin:
 http://pastebin.com/NtFmkvZz

I am running Net::SSH::Perl 1.34-9 on RHEL6.4

Next I'll bring out tcpdump next, and look at what is common between the
failing servers, but I first wanted to ask if anyone had any suggestions
or ideas?

-- 
  James Patterson
  jam...@op...

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Re: [Ssh-sftp-perl-users] Net::SSH::Perl is hanging on long command lines

[Thierry C. <thi...@gm...>]

I am not sure it is the same bug we have experienced, but it looks
similar. I had worked a little bit to solve this bug, but the slight
improvements I have produced wasn't enough, and I don't even proposed
its to the maintainer.
tcpdump shouldn't give you a lot of information, I am afraid, but you
could find something with the debug options. From what I have seen,
the protocol is not  fully implanted (the rsh inside the tunnel, I
mean).
The problem with Net::SSH::Perl is that it doesn't evolve anymore.
Now, I use Net::Openssh. It is not a pure Perl module, but it is a
very nice wrapper, efficient, with all the functions I loved in
Net::SSH::Perl. It doesn't needed too much dependencies, and it
doesn't have this stupid bug.

Sorry, it doesn't help.
Thierry

Le 10 juin 2013 à 12:40, James Patterson
<jam...@op...> a écrit :

> I have a script that connects to a server and checks if a list of rpms
> are installed. On some servers this hangs, on others it works fine.
>
> The problem seems to occur when the command being executed is longer
> than about 22000 characters.
>
> I've uploaded a simplified version of the script - that only does an
> echo - to pastebin:
> http://pastebin.com/NtFmkvZz
>
> I am running Net::SSH::Perl 1.34-9 on RHEL6.4
>
> Next I'll bring out tcpdump next, and look at what is common between the
> failing servers, but I first wanted to ask if anyone had any suggestions
> or ideas?
>
> --
>  James Patterson
>  jam...@op...
>
> --
> http://www.fastmail.fm - IMAP accessible web-mail
>
>
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Re: [Ssh-sftp-perl-users] Net::SSH::Perl is hanging on long command lines

[Ryan, M. G <Mar...@te...>]

Le 10 juin 2013 à 12:40, James Patterson <jam...@op...> a écrit :

> The problem seems to occur when the command being executed is longer 
> than about 22000 characters.
>
> I've uploaded a simplified version of the script - that only does an 
> echo - to pastebin:
> http://pastebin.com/NtFmkvZz
>

Forgive me if I've got the wrong end of stick, but you look to me to be
sending 50,000 periods as a command.

Would you not expect that to fail?

Did you mean

$cmd .= "."x50000;

instead of;

$cmd = "."x50000;    

(not that I'm sure that 50,000 periods after "echo " is going to fly real well either)

Regards,
Martin

Re: [Ssh-sftp-perl-users] Net::SSH::Perl is hanging on long command lines

[James P. <jam...@op...>]

On Mon, Jun 10, 2013, at 05:03 PM, Ryan, Martin G wrote:
> Le 10 juin 2013 à 12:40, James Patterson <jam...@op...> a
> écrit :
> 
> > The problem seems to occur when the command being executed is longer 
> > than about 22000 characters.
> >
> > I've uploaded a simplified version of the script - that only does an 
> > echo - to pastebin:
> > http://pastebin.com/NtFmkvZz
> >
> 
> Forgive me if I've got the wrong end of stick, but you look to me to be
> sending 50,000 periods as a command.
> 
> Would you not expect that to fail?
> 
> Did you mean
> 
> $cmd .= "."x50000;

yes.

> 
> instead of;
> 
> $cmd = "."x50000;    
> 
> (not that I'm sure that 50,000 periods after "echo " is going to fly real
> well either)
> 
> Regards,
> Martin
> 
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