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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,

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