Open port scanner for the Fsockopen () function

Open port Scanner with Fsockopen () function

1. Preface

This paper uses the Fsockopen () function to write a simple-function port scanner.

2. Key Technologies

The port number of this instance is fixed, through an array of traversal, using the Fsockopen () function connection, if the connection is successful, the port is open, otherwise it is closed.

The core code is as follows:

foreach ($port as $key = + $value) {    echo ' <tr> ';    Echo ' <td> '. $key. ' </td> ';    Echo ' <td> '. $value. ' </td> ';    Echo ' <td> '. $msg [$key]. ' </td> ';    $errno and $ERRSTR are basically not available here, just to set the timeout to prevent the request from timing out    $fp = @fsockopen ($ip, $value, $errno, $ERRSTR, 1);// If the host (hostname) is inaccessible, a warning level (e_warning) error message is thrown. All you need to add @    $result = $fp? ' <span style= ' color:red > Open </span> ': ' <span style= ' color:red ' > Close </span> ';    Echo ' <td> '. $result. ' </td> ';    Echo ' </tr> ';}

3, the code is as follows

<! DOCTYPE html>
Because lazy, the page and the results are written together, the layout will be put.

4. Introduction of main functions

4.1, Fsockopen

Creates a connection based on a host name, returns a resource object successfully, fails to return false, and a warning is thrown when the host is unavailable