Perl SSH连接执行telnet

#!/usr/bin/perl -X

use strict;
use Net::OpenSSH;
use Net::Telnet;

my $lhost = "linuxserver";
my $luser = "linuxuser";
my $lpass = "linuxpassword";

my $chost = "routername";
my $cpass = "Routerpassword";

my $prompt = '/(?:Password: |[>])/m';
my @commands = ("show usersr");

my $ssh = Net::OpenSSH->new($lhost,
'user' => $luser,
'password' => $lpass,
'master_opts' => [ '-t' ],
#'async' => 1 # if enabled then password cannot be set here
);
my ($pty, $err, $pid) = $ssh->open2pty("telnet $chost");

my $t = new Net::Telnet(
-telnetmode => 0,
-fhopen => $pty,
-prompt => $prompt,
-cmd_remove_mode => 1,
-output_record_separator => "r",
#-dump_log => "debug.log",
);

my $end = 0;

while (!$end) {
  my ($pre, $post) = $t->waitfor($prompt);
  if ($post =~ /Password: /m) {
    # send password
    $t->print("$cpass");
  }
  elsif ($post =~ /[>#]/ && @commands) {
    my $cmd = shift(@commands);
    if ($cmd !~ /[rn]/) {
      $t->print($cmd);
    }
    else {
      print $t->cmd($cmd);
    }
  }
  else {
    $end = 1;
    $t->cmd("exit");
  }
}
#close $pty;
$t->close();