#!/usr/bin/perl

use strict;
use warnings;
use Carp;
use Net::SSH2;

my %hosts = (
  "MX200-1" => "10.10.8.128"
);

my $DEBUG = 1;

foreach my $name (sort keys %hosts) {
  my $ip = $hosts{$name};
  $DEBUG && print "check $name ($ip)\n";

  my $ssh2 = Net::SSH2->new();
  if ($ssh2->connect($ip)) {
    $DEBUG && print "connected\n";
    $ssh2->debug($DEBUG);
    $DEBUG && print "version=".join(', ', $ssh2->version())."\n";
    $DEBUG && print "error=".$ssh2->error()."\n";

    $ssh2->auth_list(); # Returns undef, auth_ok() will return 0 unless we call this(?)
    if ($ssh2->auth_ok()) { # Returns 4 (= true, we have been authenticated OK)
      $DEBUG && print "authenticated ok\n";

      if (my $chan = $ssh2->channel()) {
        $DEBUG && print "channel open\n";
        foreach my $line (get_channel_lines($chan)) {
          print $line."\n";
        }
        $DEBUG && print "done\n";
      } else {
        croak "Error opening channel";
      }

    } else {
      croak "Expected to be authenticated: ".$ssh2->auth_ok()."\n";
    }

  } else {
    warn "Error connecting to $name ($ip); please check host status\n";
  }
}

sub get_channel_lines {
  my $chan = shift;

  my $output = "";
  until ($chan->eof) {
    my $bytes = $chan->read(my $buffer, 1024); # Blocks
    if (defined $bytes) {
      $DEBUG && print "$buffer($bytes)\n";
      $output .= $buffer;
    }
  }

  return split(/\n/, $output);
}