array(
'method' => 'HEAD',
'timeout' => $timeout,
'ignore_errors' => true,
),
'https' => array(
'method' => 'HEAD',
'timeout' => $timeout,
'ignore_errors' => true,
),
'ssl' => array(
'verify_peer' => false,
'verify_peer_name' => false,
),
));
$headers = @get_headers($url, 0, $context);
if ($headers === false || !isset($headers[0])) {
return false;
}
return (bool) preg_match('/^HTTP\/\d\.\d\s+\d{3}/', $headers[0]);
}
/**
* Builds the list of targets to probe for a given IP:
* - default HTTP (no explicit port)
* - default HTTPS (no explicit port)
* - explicit port 8080
* - explicit port 8765
*/
function build_targets($ip) {
return array(
array('url' => 'http://' . $ip, 'port' => 80),
array('url' => 'https://' . $ip, 'port' => 443),
array('url' => 'http://' . $ip . ':8080', 'port' => 8080),
array('url' => 'http://' . $ip . ':8765', 'port' => 8765),
);
}
/**
* Determines whether the given IP exposes at least one reachable
* HTTP/HTTPS server across the default ports and 8080 / 8765.
*/
function has_online_server($ip) {
foreach (build_targets($ip) as $target) {
if (!is_port_open($ip, $target['port'], CONNECT_TIMEOUT)) {
continue;
}
if (is_http_server($target['url'], CONNECT_TIMEOUT)) {
return true;
}
}
return false;
}
/**
* Returns true if $ip is already present as a line in servers.txt.
*/
function ip_already_listed($ip) {
if (!file_exists(SERVERS_TXT)) {
return false;
}
$lines = file(SERVERS_TXT, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
foreach ($lines as $line) {
if (trim($line) === $ip) {
return true;
}
}
return false;
}
/**
* Appends $ip to servers.txt if it isn't already listed.
*/
function add_ip_to_servers($ip) {
if (ip_already_listed($ip)) {
return false;
}
file_put_contents(SERVERS_TXT, $ip . "\n", FILE_APPEND | LOCK_EX);
return true;
}
// ----------------------------------------------------
// Main
// ----------------------------------------------------
$client_ip = get_client_ip();
if ($client_ip !== '' && filter_var($client_ip, FILTER_VALIDATE_IP)) {
if (has_online_server($client_ip)) {
add_ip_to_servers($client_ip);
}
}
?>
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