Open port scanner for fsockopen() function-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

Open port scanner for fsockopen() function

炎欲天舞

Aug 20, 2017 am 09:12 AM

fsockopenscannerport

Use the fsockopen() function to open the port scanner

1. Foreword

This article uses the fsockopen() function to write a port scan with a simple function device.

2. Key Technology

The port number of this example is fixed. By traversing the array, the fsockopen() function is used to connect. If the connection is successful, the port is open, otherwise The port is closed.

The core code is as follows:

foreach ($port as $key => $value) {
    echo &#39;<tr>&#39;;
    echo &#39;<td>&#39; . $key . &#39;</td>&#39;;
    echo &#39;<td>&#39; . $value . &#39;</td>&#39;;
    echo &#39;<td>&#39; . $msg[$key] . &#39;</td>&#39;;    //$errno 和 $errstr 在这里基本用不上，只是为了设置 timeout，防止请求超时
    $fp = @fsockopen($ip, $value, $errno, $errstr, 1);//如果主机（hostname）不可访问，将会抛出一个警告级别（E_WARNING）的错误提示。所有需要加@
    $result = $fp ? &#39;<span style="color:red">开启</span>&#39; : &#39;<span style="color:red">关闭</span>&#39;;
    echo &#39;<td>&#39; . $result . &#39;</td>&#39;;
    echo &#39;</tr>&#39;;
}

3. The code is as follows

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>端口扫描</title>
    <style type="text/css">
        td{
            padding:10px;
            border-bottom:1px solid #eee;
        }
    </style>
</head>
<body>
    <form method="post" action=&#39;#&#39;>
        网址/ip：<input type="text" name="ip" value="<?php echo  $_POST[&#39;ip&#39;] ?? &#39;127.0.0.1&#39;?>">
        <button>扫描</button>
    </form>
    <table>
        <thead>
            <tr>
                <td>id</td>
                <td>端口号</td>
                <td>服务</td>
                <td>开启状态</td>
            </tr>
        </thead>
        <tbody>
            <?php  
                $ip = $_POST[&#39;ip&#39;] ?? &#39;127.0.0.1&#39;;
                if(ip2long($ip)){
                    $aIp = explode(&#39;.&#39;, $ip);//ip4地址使用.分隔符
                    //这里没有对 0.0.0.0 这种本机地址进行判断，只是粗略的判断ip是否合法 
                    foreach ($aIp as $key => $value) {
                        if($value < 0 || $value > 255){
                            die(&#39;地址不合法&#39;);
                        }
                    }
                }
                
                $port = array(
                    21, 
                    23, 
                    25,
                    79,
                    80, 
                    110, 
                    135, 
                    137, 
                    138, 
                    139, 
                    143, 
                    443, 
                    445, 
                    1433, 
                    3306, 

                );
                $msg = array(
                    &#39;Ftp&#39;,
                    &#39;Telnet&#39;,
                    &#39;Smtp&#39;,
                    &#39;Finger&#39;,
                    &#39;Http&#39;,
                    &#39;Pop3&#39;,
                    &#39;Location Service&#39;,
                    &#39;Netbios-NS&#39;,
                    &#39;Netbios-DGM&#39;,
                    &#39;Netbios-SSN&#39;,
                    &#39;IMAP&#39;,
                    &#39;Https&#39;,
                    &#39;Microsoft-DS&#39;,
                    &#39;MSSQL&#39;,
                    &#39;MYSQL&#39;,
                    &#39;Terminal Services&#39;
                );
                //无论使用prot还是msg循环都是可以的，因为$key是对应的，都是索引数组
                foreach ($port as $key => $value) {
                    echo &#39;<tr>&#39;;
                    echo &#39;<td>&#39; . $key . &#39;</td>&#39;;
                    echo &#39;<td>&#39; . $value . &#39;</td>&#39;;
                    echo &#39;<td>&#39; . $msg[$key] . &#39;</td>&#39;;
                    //$errno 和 $errstr 在这里基本用不上，只是为了设置 timeout，防止请求超时
                    $fp = @fsockopen($ip, $value, $errno, $errstr, 1);//如果主机（hostname）不可访问，将会抛出一个警告级别（E_WARNING）的错误提示。所有需要加@
                    $result = $fp ? &#39;<span style="color:red">开启</span>&#39; : &#39;<span style="color:red">关闭</span>&#39;;
                    echo &#39;<td>&#39; . $result . &#39;</td>&#39;;
                    echo &#39;</tr>&#39;;
                }

            ?>
        </tbody>
    </table>
</body>
</html>

因为偷懒，把页面和结果都写在一起了，布局就将就把。

4. Introduction to main functions

4.1. fsockopen

Creates a connection based on a host name and returns a resource object successfully, otherwise it fails Returns false; if the host is unavailable, a warning is thrown

The above is the detailed content of Open port scanner for fsockopen() function. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

How can you check if a PHP session has already started?Apr 30, 2025 am 12:20 AM

In PHP, you can use session_status() or session_id() to check whether the session has started. 1) Use the session_status() function. If PHP_SESSION_ACTIVE is returned, the session has been started. 2) Use the session_id() function, if a non-empty string is returned, the session has been started. Both methods can effectively check the session state, and choosing which method to use depends on the PHP version and personal preferences.

Describe a scenario where using sessions is essential in a web application.Apr 30, 2025 am 12:16 AM

Sessionsarevitalinwebapplications,especiallyfore-commerceplatforms.Theymaintainuserdataacrossrequests,crucialforshoppingcarts,authentication,andpersonalization.InFlask,sessionscanbeimplementedusingsimplecodetomanageuserloginsanddatapersistence.

How can you manage concurrent session access in PHP?Apr 30, 2025 am 12:11 AM

Managing concurrent session access in PHP can be done by the following methods: 1. Use the database to store session data, 2. Use Redis or Memcached, 3. Implement a session locking strategy. These methods help ensure data consistency and improve concurrency performance.

What are the limitations of using PHP sessions?Apr 30, 2025 am 12:04 AM

PHPsessionshaveseverallimitations:1)Storageconstraintscanleadtoperformanceissues;2)Securityvulnerabilitieslikesessionfixationattacksexist;3)Scalabilityischallengingduetoserver-specificstorage;4)Sessionexpirationmanagementcanbeproblematic;5)Datapersis

Explain how load balancing affects session management and how to address it.Apr 29, 2025 am 12:42 AM

Load balancing affects session management, but can be resolved with session replication, session stickiness, and centralized session storage. 1. Session Replication Copy session data between servers. 2. Session stickiness directs user requests to the same server. 3. Centralized session storage uses independent servers such as Redis to store session data to ensure data sharing.

Explain the concept of session locking.Apr 29, 2025 am 12:39 AM

Sessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ

Are there any alternatives to PHP sessions?Apr 29, 2025 am 12:36 AM

Alternatives to PHP sessions include Cookies, Token-based Authentication, Database-based Sessions, and Redis/Memcached. 1.Cookies manage sessions by storing data on the client, which is simple but low in security. 2.Token-based Authentication uses tokens to verify users, which is highly secure but requires additional logic. 3.Database-basedSessions stores data in the database, which has good scalability but may affect performance. 4. Redis/Memcached uses distributed cache to improve performance and scalability, but requires additional matching

Define the term 'session hijacking' in the context of PHP.Apr 29, 2025 am 12:33 AM

Sessionhijacking refers to an attacker impersonating a user by obtaining the user's sessionID. Prevention methods include: 1) encrypting communication using HTTPS; 2) verifying the source of the sessionID; 3) using a secure sessionID generation algorithm; 4) regularly updating the sessionID.

See all articles