Perl EVENT HANDLER SSH Remote Command Exection

[Badri Pillai]

Hi Jason,

I assume you are using public key authentication.

If yes,
I don't see ssh key to be used  being passed as argument,
cause the key files are searched by default in "$HOME/.ssh"
may be this directory is not accessible for the server?

Other options to check -> if you  need a  " pty??  or not.


Regards,

BP
Jason wrote:
> Hello,
> I've written an Event Handler using Perl. The intent is to verify on the
> remote box that we do need to restart the daemon in question, and then
> perform a restart if needed.
>
> The script works perfectly via the command line when I execute it as the
> nagios user. Unfortunately, if the script doesn't work properly when it is
> executed by nagios in response to a state change. It dies before completion.
>
> I've put in various hooks (Basicly just made it send me an email at various
> stages of the script) to determine exactly where it dies, and have isolated
> it. Here is the portion that causes the script to die when nagios executes
> it. (Please trust me and assume that $hostname and $username contain proper
> values. I've tested the variables extensively to insure that they are being
> populated.)
>
> If I run the below, I'll see a log entry and an email for Step 1, but
> nothing for Step 2 and beyond.
>
> #!/usr/bin/perl
> require '/usr/local/scripts/subs.pl';
>
> report_findings("Step 1",".");
> my $command = "grep check_tacplus /usr/local/nagios/etc/nrpe.commands";
> my %tac_expected = run_command($command, $hostname, $username);
> report_findings("Step 2",".");
>
> sub run_command {
>         my $command = $_[0];
>         my $host = $_[1];
>         my $username = $_[2];
>
>         my %result = SSHexec($command, $hostname, $username);
>         if ($result{'err'}) {
>                 my $subject = "Automated refreshtac failed on $hostname";
>                 my $message = "Error when attempting SSH connection to
> $hostname:\n";
>                 $message .= "  ".$result{'err'}."\n";
>                 report_findings($subject, $message, $recipients);
>                 exit;
>         }
>         return %result;
> }
>
> sub SSHexec {
>         use Net::SSH::Perl;
>
>         my $CMD = $_[0];
>         my $HOST = $_[1];
>         my $USR = $_[2];
>         my %RESULT;
>
>         if (pingHost($HOST)) {
>                 %RESULT = ("err", "Connectivity Failure");
>                 return %RESULT;
>         }
>
>         my $ssh = Net::SSH::Perl->new($HOST, options => [ "protocol '2,1'"
> ]);
>         unless ($ssh->login($USR)) {
>                 %RESULT = ("err", "Authentication Failure");
>                 return %RESULT;
>         }
>         my ($out,$err,$exit) = $ssh->cmd($CMD);
>         %RESULT = ("out", $out,
>                         "err", $err,
>                         "exit", $exit);
>         return %RESULT;
> }
>
> &report_findings is nothing but a wrapper for logging and sending email.
> This works up until the SSH call.
>
> &SSHexec is contained in /usr/local/scripts/subs.pl which holds common
> subroutines that I use frequently when writing scripts. I use other subs
> from there, so I know it's getting loaded.
>
> I cannot figure out why this is working as an automation, when it works
> perfectly otherwise. Any advice/hints/suggestions?
>
>   
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