$protocol = getprotobyname("tcp");
socket(SOCK,PF_INET,SOCK_STREAM,$protocol) or
    die "socket: $!\n";
setsockopt(SOCK,SOL_SOCKET,SO_REUSEADDR,1) or
    die "setsockopt: $!\n";

$paddr = sockaddr_in($port, INADDR_ANY);

bind(SOCK, $paddr) or
    die "bind: $!\n";
listen(SOCK,SOMAXCONN) or
    die "listen: $!\n";

print "Server started on port $port.\n";

while ($client_addr = accept(CLIENT,SOCK))
{
    my ($client_port,$client_ip) = sockaddr_in($client_addr);
    $client_ipnum = inet_ntoa($client_ip);
    $client_host = gethostbyaddr($client_ip,AF_INET);
    
    print "$client_host connected from ip $client_ipnum\n";

readagain:
    while (chomp($line = <CLIENT>))
    {
        print "From client: $line\n";
        if ($line eq "END")
        {
            goto inputfromuser;
        }
    }
inputfromuser:
    
    print "Input > ";
    chomp($input = <>);
    print CLIENT "$input\n";
goto readagain;
    
    print CLIENT "Test message :)\n";
    #print CLIENT "\0";
    
    print "Out of loop\n";
}

print "Closing connection.\n";
close CLIENT;