heartbleed bug vulnerabilities scaner

#!/usr/local/bin/perl
#####################################################
#                                                   #
# Built to check for heartbleed bug vulnerabilities #
# Author: Andrew Speer                              #
# Date: 20140408                                    #
# Desc: Scans hosts which respond on common SSL     #
#       ports (443, 8443) for Heartbeat.            #
#                                                   #
#####################################################

use strict;
use warnings;
use Getopt::Std;
use NetAddr::IP;

my @ips;
my $date = `date`;
chomp ($date);
my $fn;
my @networks;
my @ports = ('443', '8443');
my $timeout;
my %args;
# -i ip address(s) to scan seperated by commas
# -n network(s) to scan seperated by commas
# -p port(s) to scan seperated by commas
# -t timeout in seconds for server to respond
# -o output filename
# -h help
getopts('i:n:p:t:o:h', \%args);

if ($args{h}){
  print "\nUsage of this tool:

# -i ip address(s)\/hostnames(s) to scan seperated by commas
# -n network(s) CIDR to scan seperated by commas
# -p port(s) to scan seperated by commas
# -t timeout in seconds for server to respond
# -o output filename
# -h help\n";
}
if ($args{i}){ @ips = split(',',$args{i}); }
if ($args{n}){ @networks = split(',', $args{n}); }
if ($args{p}){ @ports = split(',', $args{p}); }
if ($args{o}){
  $fn = $args{o};
  open (LOG,'>>',$fn) || die "Can't Open File: $fn\n";;
  print LOG "$date\n";
}
if ($args{t}){ $timeout = $args{t}; }
else{ $timeout = 2; }

if (@networks){
  foreach my $network (@networks){
    my $net = NetAddr::IP->new($network);
    my @hosts = $net->hostenum;
    for my $ip (@hosts) {
      push (@ips, $ip->addr);
}}}

if (@ips){
  foreach my $ip (@ips){
    foreach my $port (@ports){
      my $nmap = `nmap -p$port $ip 2>&1| grep open`;
      if ($nmap =~ "open"){
        my $return = `timeout $timeout openssl s_client -connect $ip:$port -tlsextdebug 2>&1| grep 'TLS server extension "heartbeat"'`;
        if ($return){
          my $hostname = `host $ip 2>&1`;
          chomp $hostname;
          print "$ip: Vulnerable  -  $hostname\n";
          if ($args{o}){
            print LOG "$ip: Vulnerable  -  $hostname\n";
          }
        }
        else{
          print "$ip: Not Vulnerable\n";
          if ($args{o}){
            print LOG "$ip: Not Vulnerable\n";}
          }
}}}}
if ($args{o}){ close (LOG); }