Update: Thanks for the help! I'll try the eval ( ) block in the morning.

I'm trying to write a script that will iterate over a list of IP addresses, connecting to each via SSH and executing some commands. It's possible that one or more of the IP addresses could be invalid, in which case I want my script to log that fact and move on to the next address. Instead, the script just halts.

I've tried both Net::SSH::Expect and Net::SSH::Perl.

Net::SSH::Expect code:

#!/usr/bin/perl

require Net::SSH;
require Net::SSH::Expect;

my %hosts = (
  "192.168.1.31" => "admin,password",
  "192.168.1.61" => "admin,password",
);

my $ssh;
open (LOG,">>./audit.log");

foreach $host (keys %hosts) {
  myAuditLog(LOG,"Accessing $host . . .");
  ($login,$passwd) = split /,/,$hosts{$host};

  $ssh = Net::SSH::Expect->new (
         host     => "$host",
         user     => "$login",
         password => "$passwd",
         raw_pty  => 1
  );
  $loginOutput = $ssh->login() || myAuditLog(LOG,"Login has failed. $!
+");
  # do stuff
  $ssh->close();
}
close(LOG);

[download]

Net::SSH::Perl code: Same as above, except replace the Net::SSH::Expect->new and $ssh->login bit with: 

$ssh = Net::SSH::Perl->new($host);
$ssh->login($login,$passwd) || myAuditLog(LOG,"Login has failed. $!");

[download]

(And, obviously, require Net::SSH::Perl.)

In both cases, as soon as $ssh->login is evaluated for an invalid IP address, the script prints an error message to STDOUT. For Net::SSH::Expect the error is:

SSHAuthenticationError Login timed out. The input stream currently has the contents bellow:  at /usr/local/lib/perl5/site_perl/5.10.0/Expect.pm line 828

Then the script just . . . stops. myAuditLog is not evaluated, so I can't get at $! or $loginOutput. (myAuditLog just prints log messages and timestamps to LOG. I've tried printing to STDOUT instead of calling myAuditLog, but the print command doesn't get evaluated either.)

Help! :(

BTW, I do have root access to the machines on which this script will run, so if there's a different module I should be using instead of Net::SSH::Expect or Net::SSH::Perl, feel free to suggest it.

Thanks in advance!

In reply to Net::SSH::Perl, Net::SSH::Expect crashes script if host is unreachable by LadyEngineer

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