使用CURL检查网站是否正在使用SSL

Question

我正在构建一个脚本，该脚本将检查网站是否正在使用SSL。例如，我们使用“ http://www.google.com/ ”，它将被重定向到“ https://www.google.com/ ”。我该如何检查？我正在使用以下cURL代码来获取网站的标头。

<?php
$url = 'https://www.google.com';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url); // set url
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6"); // set browser/user agent
curl_setopt($ch, CURLOPT_HEADERFUNCTION, 'read_header'); // get header
curl_exec($ch);

function read_header($ch, $string) {
    print "Received header: $string";
    return strlen($string);
}
?>

输出：

HTTP/1.1 302 Found 
Cache-Control: private 
Content-Type: text/html; charset=UTF-8 
Location: https://www.google.co.in/?gfe_rd=cr&ei=YEAkV7SEFrTv8wexyy0 
Content-Length: 259 
Date: Sat, 30 Apr 2016 05:19:28 GMT 
Alternate-Protocol: 443:quic 
Alt-Svc: quic=":443"; ma=2592000; v="33,32,31,30,29,28,27,26,25" 

Answer 1

PHP-cURL

我认为使用cURL是一个矫kill过正，但是无论如何您都可以使用。

<?php
function ignoreHeader( $curl, $headerStr ) {
  return strlen( $headerStr );
}

$curl = curl_init( "https://example.com/" );
curl_setopt( $curl, CURLOPT_NOBODY, TRUE );
curl_setopt( $curl, CURL_HEADERFUNCTION, 'ignoreHeader' );
curl_exec( $curl );

$result = false;
if ( curl_errno($curl) == 0 ) {
  $info = curl_getinfo( $curl );
  if ( $info['http_code'] == 200 ) {
    $result = true;
  }
}
?>

PHP-没有cURL

如果要检查网站是否具有SSL证书。您可以打开一个流并检查SSL证书参数。

<?php
// Create a stream context
$stream = stream_context_create ( array( "ssl" => array( "capture_peer_cert" => true ) ) );

// Bind the resource 'https://www.example.com' to $stream
$read   = fopen( "https://www.example.com", "rb", false, $stream );

// Get stream parameters
$params  = stream_context_get_params( $read );

// Check that SSL certificate is not null
// $cert should be for example "resource(4) of type (OpenSSL X.509)" 
$cert   = $params["options"]["ssl"]["peer_certificate"];
$result = ( !is_null( $cert ) ) ? true : false;
?>

如果要检查主机是否在443端口上接受连接，则可以fsockopen用来启动与主机的套接字连接。

<?php
// Set host and port. 
$host   = 'example.com';
$port   = 443;

// Initiate a socket connection with 'example.com' and check the result. 
$fp     = fsockopen('ssl://'. $host, $port, $errno, $errstr, 30);
$result = ( !is_null( $fp ) ) ? true : false;
?>