Table of Contents
回复讨论(解决方案)
Home Backend Development PHP Tutorial UDP校验和的计算方法

UDP校验和的计算方法

Jun 23, 2016 pm 02:15 PM

如何求UDP的校验和,我的IP是192.168.1.59  端口号是30002
连接的机子是192.168.1.179 端口号是30000

然后 是如何求校验和的呢


回复讨论(解决方案)

咕~~(???)b 不懂

    就是chechsum 如何获取到,还要有字节长度吗?还需要字节长度吗?  字节长度如果是66   然后 又怎么获取到 这个checksum呢?

这个一般是系统级或网卡做的事,php很难做吧?

嗯  php 这方面的不多, 而且这个校验和和传输的数据,所有的都相加, 又异或 ,再求和。。什么的。 但是  不知道 都要加哪些?

找个 C 语言的代码移植一下不就可以了

找个 C 语言的代码移植一下不就可以了
有没有 例子 什么的啊。  关键php中16进制的数,是要先转成二进制的,才能进行异或求和吗?

php 提供了所有的相关函数
你把你不会的部分贴出来

$FileData=array();

///8字节头
$FileData[0]=0x75;
$FileData[1]=0x30;
$FileData[2]=0x75;
$FileData[3]=0x32;
$FileData[4]=0x00;
$FileData[5]=0x20;

//------Udp 头部校验和




$a=$FileData[0]*256+$FileData[1];
$b=$FileData[2]*256+$FileData[3];
$c=$FileData[4]*256+$FileData[5];
$d=($a+$b+$c);

$FileData[6]=~(($d>>8)&0xFF);
$FileData[7]=~($d&0xFF);
//---------------------

///16字节数据
//标识号:01020304
$FileData[8]=0x01;
$FileData[9]=0x02;
$FileData[10]=0x03;
$FileData[11]=0x04;

//操作命令:0x00000001
$FileData[12]=0x00;
$FileData[13]=0x00;
$FileData[14]=0x00;
$FileData[15]=0x02;

//操作结果:0x00000000
$FileData[16]=0x00;
$FileData[17]=0x00;
$FileData[18]=0x00;
$FileData[19]=0x01;

//保留
$FileData[20]=0x00;
$FileData[21]=0x00;
$FileData[22]=0x00;
$FileData[23]=0x00;

//---------------------
///8字节校验和
$FileData[24]=$FileData[0]^$FileData[8]^$FileData[16];
$FileData[25]=$FileData[1]^$FileData[9]^$FileData[17];
$FileData[26]=$FileData[2]^$FileData[10]^$FileData[18];
$FileData[27]=$FileData[3]^$FileData[11]^$FileData[19];
$FileData[28]=$FileData[4]^$FileData[12]^$FileData[20];
$FileData[29]=$FileData[5]^$FileData[13]^$FileData[21];
$FileData[30]=$FileData[6]^$FileData[14]^$FileData[22];
$FileData[31]=$FileData[7]^$FileData[15]^$FileData[23];

$arrayLen = sizeof( $FileData );
foreach($FileData as $arr)
{
$str.= $arr;
}

echo $str;
//$str 应该是16字节的数据
UDP报文的数据内容定义
标识号 操作命令 操作数据(结果) 保留
4字节   4字节   4字节   4字节


所以现在就是想得到它的校验和

我上面写的校验和不对,输出的数据也不对

php 提供了所有的相关函数
你把你不会的部分贴出来

而且 IP如何转成16进制的?  这方面 也不会,

Statement of this Website
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

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

11 Best PHP URL Shortener Scripts (Free and Premium) 11 Best PHP URL Shortener Scripts (Free and Premium) Mar 03, 2025 am 10:49 AM

Long URLs, often cluttered with keywords and tracking parameters, can deter visitors. A URL shortening script offers a solution, creating concise links ideal for social media and other platforms. These scripts are valuable for individual websites a

Working with Flash Session Data in Laravel Working with Flash Session Data in Laravel Mar 12, 2025 pm 05:08 PM

Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-

Build a React App With a Laravel Back End: Part 2, React Build a React App With a Laravel Back End: Part 2, React Mar 04, 2025 am 09:33 AM

This is the second and final part of the series on building a React application with a Laravel back-end. In the first part of the series, we created a RESTful API using Laravel for a basic product-listing application. In this tutorial, we will be dev

Simplified HTTP Response Mocking in Laravel Tests Simplified HTTP Response Mocking in Laravel Tests Mar 12, 2025 pm 05:09 PM

Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>

cURL in PHP: How to Use the PHP cURL Extension in REST APIs cURL in PHP: How to Use the PHP cURL Extension in REST APIs Mar 14, 2025 am 11:42 AM

The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

12 Best PHP Chat Scripts on CodeCanyon 12 Best PHP Chat Scripts on CodeCanyon Mar 13, 2025 pm 12:08 PM

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

Announcement of 2025 PHP Situation Survey Announcement of 2025 PHP Situation Survey Mar 03, 2025 pm 04:20 PM

The 2025 PHP Landscape Survey investigates current PHP development trends. It explores framework usage, deployment methods, and challenges, aiming to provide insights for developers and businesses. The survey anticipates growth in modern PHP versio

Notifications in Laravel Notifications in Laravel Mar 04, 2025 am 09:22 AM

In this article, we're going to explore the notification system in the Laravel web framework. The notification system in Laravel allows you to send notifications to users over different channels. Today, we'll discuss how you can send notifications ov

See all articles