Explication détaillée de la fonction PHP fsockopen

allow_url_fopen = On

<?php
    $fp = fsockopen("127.0.0.1",80,$errno,$errstr,30);
    if(!$fp){
        echo "$errstr ($errno)<br />\n";
    }else{
        $out = "GET / HTTP/1.1\r\n";
        $out .= "Host: 127.0.0.1\r\n";
        $out .= "Connection: Close\r\n\r\n";
        fwrite($fp,$out);
        $content = &#39;&#39;;
        while(!feof($fp)){
            $content .= fgets($fp,128);
        }
        echo $content;
        fclose($fp);
    }
?>

<?php
$url = "http://localhost/test2.php?site=www.tbrer.com";
print_r(parse_url($url));// 解析 URL，返回其组成部分

/* get提交 */
sock_get($url,&#39;user=gonn&#39;);

// fsocket模拟get提交
function sock_get($url,$query){
    $data = array(
        &#39;foo&#39; => &#39;bar&#39;,
        &#39;baz&#39; => &#39;boom&#39;,
        &#39;site&#39; => &#39;www.tbrer.com&#39;,
        &#39;name&#39; => &#39;nowa magic&#39;
    );

    $query_str = http_build_query($data);// http_build_query()函数的作用是使用给出的关联（或下标）数组生成一个经过 URL-encode 的请求字符串

    $info = parse_url($url);
    $fp = fsockopen($info["host"],80,$errno,$errstr,30);
    $head = "GET " . $info[&#39;path&#39;] . &#39;?&#39; . $query_str . " HTTP/1.0\r\n";
    $head .= "Host: " . $info[&#39;host&#39;] . "\r\n";
    $head .= "\r\n";
    $write = fputs($fp,$head);
    while(!feof($fp)){
        $line = fread($fp,4096);
        echo $line;
    }
}
?>

<?php
$url = "http://localhost/test2.php?site=www.tbrer.com";
print_r(parse_url($url));// 解析 URL，返回其组成部分

/* get提交 */
sock_post($url,&#39;user=gonn&#39;);

// fsocket模拟get提交
function sock_post($url,$query){
    $info = parse_url($url);
    $fp = fsockopen($info["host"],80,$errno,$errstr,30);
    $head = "POST " . $info[&#39;path&#39;] . "?" . $info["query"] . " HTTP/1.0\r\n";
    $head .= "Host: " . $info[&#39;host&#39;] . "\r\n";
    $head .= "Referer: http://" . $info[&#39;host&#39;] . $info[&#39;path&#39;] . "\r\n";
    $head .= "Content-type: application/x-www-form-urlencoded\r\n";
    $head .= "Content-Length: ". strlen(trim($query)) . "\r\n";
    $head .= "\r\n";
    $head  .= trim($query);
    $write = fputs($fp,$head);
    while(!feof($fp)){
        $line = fread($fp,4096);
        echo $line;
    }
}
?>

<?php
    /* 
        *   Socket 模拟HTTP协议传输文件
        *   Http是应用层协议使用80端口
    */
    $hostname = &#39;127.0.0.1&#39;;
    $port = &#39;80&#39;;

    // 建立连接
    $fp = fsockopen($hostname,$port,$errno,$errstr);
    stream_set_blocking($fp,true);
    if(!$fp){
        echo "$errno : $errstr<br />";
    }else{
        // 发送一个HTTP请求信息头
        $request_header = "GET /aaa.txt";

        // 起始行
        // 头域 
        $request_header .= "Host: $hostname\n";
        
        // 再一个回车换行表示头信息结束
        $request_header .= "\n";

        // 发送请求到服务器
        fputs($fp,$request_header);

        // 接受响应
        $fp2 = fopen(&#39;aaa.txt&#39;,&#39;w&#39;);

        while(!feof($fp)){
            $line = fputs($fp2,fgets($fp,128));
            echo $line;
        }

        // 关闭
        fclose($fp2);
        fclose($fp);
    }
?>

<?php
$host = "127.0.0.1"; //你要访问的域名
$ip = &#39;127.0.0.1&#39;;
$target = "/test2.php"; //你要访问的页面地址
$referer = "http://www.tbrer.com/"; //伪造来路页面
//$fp = fsockopen($host, 80, $errno, $errstr, 30);
$fp = fsockopen($ip, 80, $errno, $errstr, 30);
if(!$fp)
{
    echo "$errstr($errno)<br />\n";
}
else
{
	$end = "\r\n";
    $out = "GET $target HTTP/1.1$end";
	$out .= "Host: $ip$end";
	$out .= "Referer: $referer$end";
	$out .= "Connection: Close$end";
	$out .= "$end";
    fwrite($fp, $out);
    while(!feof($fp))
    {
        echo fgets($fp, 1024);
    }
    fclose($fp);
}
?>