#!/usr/bin/perl -w

use strict;
use Net::FTP;
use Mail::Mailer;

my $host = 'www.trustedftpsite.org';
my $user = 'anonymous';
my $pass = 'updatepuller@avtrustingclient.org';
my $remote_dir = '/pub/antivirus/NAV/signatures';
my $destination_dir = 'current-sig';
my $type = 'sendmail';
my $mailprog = Mail::Mailer->new($type);

my @lupd = ();
  if(-e "./lastupdate.txt") {
    open(LASTUPDATE,"./lastupdate.txt")
      or die "Error while opening lastupdate.txt ($!)";
    chomp( @lupd = <LASTUPDATE> );
    close(LASTUPDATE)
      or die "Error while closing lastupdate.txt ($!)";
  }

my %haveit;
  @haveit{ @lupd } = (1) x @lupd;

my $ftp = Net::FTP->new($host, Debug => 1);
   $ftp->login($user,$pass)
      or die "Could not connect to ftp server ($!)";

my @listing = grep /x86\.exe$/i, $ftp->ls($remote_dir);
my @newupdate;

$ftp->type("I");
    for my $file (@listing) {
      next if $haveit{$file};
      if ($ftp->get($file, "$destination_dir/avdefs.exe")) {
        mailer($file);
        push @newupdate, $file;  
      }
    }

    $ftp->quit;

open(NEWUPDATE,">>./lastupdate.txt")
    or die "Couldn't open lastupdate.txt for appending ($!)";
  print NEWUPDATE map "$_\n", @newupdate;
  close(NEWUPDATE)
    or die "Closing lastupdate.txt failed ($!)";

sub mailer {
my $file = shift;
my %headers = (
    'To' => 'iwannaknow@trustingclient.org',
    'From' => 'Antivirusupdater@yournewdefs.com',
    'Subject' => 'New AntiVirus Signatures brought down'
               );
$mailprog->open(\%headers);
    print $mailprog "The Latest AntiVirus signature is $file.\n";
$mailprog->close;
           }