hello, can anyone help me with this problem? im just a beginner and currently starting to program in perl, also i just installed openssh because what i really need is to ssh to a ubuntu server.
so I tried my code:
my problem is that it keeps returning errors that I dont understand, it says:
use of uninitialized value $default_stdin_fh in anonymous hash....
almost the whole errors says like this but changes to $default_stdout_fh,$default_stderr_fh,$master_stdi n_fh........
what does these error mean?
Last edited by Yogesh Sawant; 10-27-2010 at 04:20 AM..
Reason: added code tags
Can you try something like this? Source: Net::OpenSSH
Quote:
mod_perl and mod_perl2
mod_perl and mod_perl2 tie STDIN and STDOUT to objects that are not backed up by real file descriptors at the operative system level. Net::OpenSSH will fail if any of these handles is used explicetly or implicitly when calling some remote command.
The workaround is to redirect them to /dev/null or to some file:
open my $def_in, '<', '/dev/null' or die "unable to open /dev/null"; my $ssh = Net::OpenSSH->new($host,
default_stdin_fh => $def_in);
Also, note that from a security stand point, running ssh from inside the webserver process is not a great idea. An attacker exploiting some Apache bug would be able to access the ssh keys and passwords and gain unlimited access to the remote systems.
If you can, use a queue (as TheSchwartz) or any other mechanism to execute the ssh commands from another process running under a different user account.
At a minimum, ensure that ~www-data/.ssh (or similar) is not accessible through the web server!
...
my problem is that it keeps returning errors that I dont understand, it says:
use of uninitialized value $default_stdin_fh in anonymous hash....
almost the whole errors says like this but changes to $default_stdout_fh,$default_stderr_fh,$master_stdi n_fh........
what does these error mean?
It means exactly what it says.
$default_stdin_fh has not been initialized, and therefore perl shows that warning.
A very short example might help in understanding this better -
I declared the scalar $x, but did not initialize it. Perl doesn't know how to compare a literal string "hello" with an uninitialized value of $x. So it shows the warning.
Note that it's a warning, not an error. If I remove the "-w" flag, then this will not be shown.
That's the same as removing the "use warnings" statement from a Perl program file - although it's highly recommended to retain it.
Of course, the problem isn't fixed by turning warnings off. You'll have to actually initialize the scalar/array/hash/whatever to make your program work.
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